CN104075456A - Control method and device and water heater - Google Patents

Abstract

The embodiment of the invention discloses a control method, a control device and a water heater, wherein the water temperature and the outdoor environment temperature of the water heater are obtained, the preset corresponding relation between the outdoor environment temperature and the highest water temperature of a unit when a compressor normally operates is determined, the highest water temperature of the unit when the compressor normally operates is corresponding to the obtained outdoor environment temperature value, when the water temperature of the water heater is higher than the highest water temperature of the unit when the compressor normally operates, the compressor operates beyond the range, at the moment, the water temperature of the unit of the water heater is reduced, the compressor is ensured to recover to normally operate, and the fault rate of the compressor of an air source heat pump water heater.

Description

Control method and device and water heater

Technical Field

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

Background

Along with the wide use of air source heat pump water heaters, the use comfort and reliability of users to the air source heat pump water heaters are higher and higher. In order to improve the reliability of the air source heat pump water heater, each air source heat pump water heater manufacturer starts to adopt a professional heat pump water heater compressor to improve the reliability of the unit.

However, compared with commercial air-cooled cold (hot) water units, the water temperature of hot water produced by an air source heat pump water heater is usually 10 ℃ higher or even more, so that the condensation temperature of a compressor of the heat pump water heater is higher, the condition that the compressor of the heat pump water heater runs beyond the operation range of the compressor is easily caused, the compressor of the heat pump water heater is easily caused to be in fault, and the fault rate of the compressor of the heat pump water heater is higher.

Therefore, how to reduce the failure rate of the compressor of the air source heat pump water heater becomes an urgent problem to be solved.

Disclosure of Invention

The invention aims to provide a control method, a control device and a water heater so as to reduce the failure rate of a compressor of an air source heat pump water heater.

In order to achieve the purpose, the invention provides the following technical scheme:

a control method is applied to a water heater, wherein a compressor is arranged in the water heater, and the method comprises the following steps:

acquiring the water temperature of a water heater;

acquiring an outdoor environment temperature value;

determining the maximum water temperature of the unit during normal operation of the compressor corresponding to the acquired outdoor environment temperature value according to the corresponding relation between the preset outdoor environment temperature and the maximum water temperature of the unit during normal operation of the compressor;

when the water temperature of the water heater is higher than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates, determining a target water temperature which is lower than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates;

and controlling the compressor according to the target water temperature and the current water temperature of the unit so as to enable the water temperature in the water heater to reach the target water temperature.

In the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps: t is_max1＝55℃。

In the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor environment temperature is more than 20 ℃ and less than or equal to 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=-\frac{1}{3}{T}_{\mathrm{env}}+71;$

wherein, T_envIs the outdoor ambient temperature.

In the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor environment temperature is more than 7 ℃ and less than or equal to 20 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

T_max1＝65℃。

in the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{14}{T}_{\mathrm{env}}+\frac{875}{14};$

wherein, T_envIs the outdoor ambient temperature.

In the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor environment temperature is more than or equal to minus 30 ℃ and less than or equal to minus 7 ℃, the maximum water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{19}{T}_{\mathrm{env}}+\frac{1175}{19};$

wherein, T_envIs the outdoor ambient temperature.

In the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor environment temperature is less than minus 30 ℃, the maximum water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

T_max1＝53℃。

in the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝38℃。

in the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor environment temperature is more than 25 ℃ and less than or equal to 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=-\frac{6}{20}{T}_{\mathrm{env}}+\frac{1070}{20};$

wherein, T_envIs the outdoor ambient temperature.

In the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor environment temperature is more than 7 ℃ and less than or equal to 25 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝46℃。

in the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{1}{14}{T}_{\mathrm{env}}+\frac{637}{14};$

wherein, T_envIs the outdoor ambient temperature.

In the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor ambient temperature is greater than or equal to-30 c,and when the temperature is less than or equal to minus 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{2}{19}{T}_{\mathrm{env}}+\frac{869}{19};$

wherein, T_envIs the outdoor ambient temperature.

In the above method, preferably, the correspondence between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is in normal operation is:

when the outdoor environment temperature is less than minus 30 ℃, the maximum water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝42。

a control device is applied to a water heater, the water heater comprises a compressor, and the device comprises:

the first acquisition module is used for acquiring the water temperature of the water heater;

the second acquisition module is used for acquiring the outdoor environment temperature value;

the first determining module is used for determining the highest water temperature of the unit during normal operation of the compressor, which corresponds to the acquired outdoor environment temperature value, according to the corresponding relation between the preset outdoor environment temperature and the highest water temperature of the unit during normal operation of the compressor;

a second determining module, configured to determine a target water temperature when the water temperature of the water heater is higher than the maximum water temperature of the unit when the compressor normally operates, which corresponds to the obtained outdoor environment temperature value, and the target water temperature is lower than the maximum water temperature of the unit when the compressor normally operates, which corresponds to the obtained outdoor environment temperature value;

and the control module is used for controlling the compressor according to the target water temperature and the current water temperature of the unit so as to enable the water temperature in the water heater to reach the target water temperature.

The above apparatus, preferably, the first determining module includes:

a first corresponding relation determining unit for determining the corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps: t is_max1＝55℃。

The above apparatus, preferably, the first determining module includes:

a second corresponding relation determining unit for determining the corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is more than 20 ℃ and less than or equal to 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=-\frac{1}{3}{T}_{\mathrm{env}}+71;$

wherein, T_envIs the outdoor ambient temperature.

The above apparatus, preferably, the first determining module includes:

a third corresponding relation determining unit for determining the corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is more than 7 ℃ and less than or equal to 20 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

T_max1＝65℃。

the above apparatus, preferably, the first determining module includes:

a fourth corresponding relation determining unit for determining the corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{14}{T}_{\mathrm{env}}+\frac{875}{14};$

wherein, T_envIs the outdoor ambient temperature.

The above apparatus, preferably, the first determining module includes:

a fifth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is more than or equal to-30 ℃ and less than or equal to-7 ℃, the highest unit is used when the compressor normally operatesWater temperature T_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{19}{T}_{\mathrm{env}}+\frac{1175}{19};$

wherein, T_envIs the outdoor ambient temperature.

The above apparatus, preferably, the first determining module includes:

a sixth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is less than minus 30 ℃, the maximum water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

T_max1＝53℃。

the above apparatus, preferably, the first determining module includes:

a seventh corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝38℃。

the above apparatus, preferably, the first determining module includes:

an eighth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is more than 25 ℃ and less than or equal to 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=-\frac{6}{20}{T}_{\mathrm{env}}+\frac{1070}{20};$

wherein, T_envIs the outdoor ambient temperature.

The above apparatus, preferably, the first determining module includes:

a ninth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is more than 7 ℃ and less than or equal to 25 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝46℃。

the above apparatus, preferably, the first determining module includes:

a tenth correspondence determining unit for determining a correspondence between the outdoor ambient temperature and a maximum water temperature of the unit at the time of normal operation of the compressor, wherein,

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{1}{14}{T}_{\mathrm{env}}+\frac{637}{14};$

wherein, T_envIs the outdoor ambient temperature.

The above apparatus, preferably, the first determining module includes:

an eleventh corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is more than or equal to minus 30 ℃ and less than or equal to minus 7 ℃, the maximum water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{2}{19}{T}_{\mathrm{env}}+\frac{869}{19};$

wherein, T_envIs the outdoor ambient temperature.

The above apparatus, preferably, the first determining module includes:

a twelfth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is less than-30 ℃, the compressorMaximum water temperature T of unit during normal operation_max2Comprises the following steps:

T_max2＝42。

a water heater comprises a compressor and further comprises the control device.

According to the scheme, the control method obtains the water temperature of the water heater and the outdoor environment temperature, and determines the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates according to the corresponding relation between the preset outdoor environment temperature and the unit maximum water temperature when the compressor normally operates; when the water temperature of the water heater is higher than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates, determining a target water temperature which is lower than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates; and controlling the compressor according to the target water temperature and the current water temperature of the unit so as to enable the water temperature in the water heater to reach the target water temperature.

That is to say, in the embodiment of the present application, when the water temperature of the water heater is higher than the maximum water temperature of the unit during normal operation of the compressor corresponding to the obtained outdoor environment temperature value, it is indicated that the compressor is operating beyond the range, and at this time, the water temperature of the water heater unit is reduced, so that the compressor is ensured to recover normal operation, and the failure rate of the air source heat pump water heater compressor is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a flowchart of an implementation of a control method provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a control device according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a first determining module according to an embodiment of the present disclosure;

fig. 4 is another schematic structural diagram of the first determining module according to an embodiment of the present disclosure.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be practiced otherwise than as specifically illustrated.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The control method and the control device provided by the embodiment of the application are applied to the water heater, and the water heater is provided with the compressor.

An implementation flowchart of the control method provided in the embodiment of the present application is shown in fig. 1, and may include:

step S11: and acquiring the water temperature of the water heater.

The water temperature of the water heater can be the water temperature at the water outlet of the water tank of the water heater or the water temperature at the water inlet of the water tank of the water heater.

Step S12: acquiring an outdoor environment temperature value;

in the embodiment of the present application, the specific execution sequence of steps S11 and S12 is not specifically limited, and step S11 may be executed first, and then step S12 may be executed; step S12 may be executed first, and then step S13 may be executed; alternatively, step S11 and step S12 are executed simultaneously.

Step S13: determining the maximum water temperature of the unit during normal operation of the compressor corresponding to the acquired outdoor environment temperature value according to the corresponding relation between the preset outdoor environment temperature and the maximum water temperature of the unit during normal operation of the compressor;

in the embodiment of the application, the maximum water temperature allowed by the normal operation of the compressor corresponding to the currently acquired outdoor environment temperature can be obtained according to the acquired outdoor environment temperature and the corresponding relation between the preset outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally.

Step S14: when the water temperature of the water heater is higher than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates, determining a target water temperature which is lower than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates;

in the embodiment of the present application, the determined target water temperature may be lower than a maximum water temperature allowed by normal operation of the compressor corresponding to the acquired outdoor ambient temperature.

Step S15: and controlling the compressor according to the target water temperature and the current water temperature of the unit so as to enable the water temperature in the water heater to reach the target water temperature.

The embodiment of the application provides a control method, which comprises the steps of obtaining the water temperature of a water heater and the outdoor environment temperature, and determining the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when a compressor normally operates according to the corresponding relation between the preset outdoor environment temperature and the unit maximum water temperature when the compressor normally operates; when the water temperature of the water heater is higher than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates, determining a target water temperature which is lower than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates; and controlling the compressor according to the target water temperature and the current water temperature of the unit so as to enable the water temperature in the water heater to reach the target water temperature.

That is to say, in the embodiment of the present application, when the water temperature of the water heater is higher than the maximum water temperature of the unit during normal operation of the compressor corresponding to the obtained outdoor environment temperature value, it is indicated that the compressor is operating beyond the range, and at this time, the water temperature of the water heater unit is reduced, so that the compressor is ensured to recover normal operation, and the failure rate of the air source heat pump water heater compressor is reduced.

In the embodiment of the application, when the corresponding relation of the outdoor environment temperature and the highest water temperature of the unit during normal operation of the compressor can be summarized through experiments, the water temperature of the unit is lower than a certain value, so that the unreliable point can not occur during operation of the unit.

In the above embodiment, preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may be:

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps: t is_max1＝55℃；

In the above embodiment, preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may be:

when the outdoor environment temperature is more than 20 ℃ and less than or equal to 50 ℃, the highest water of the unit is used when the compressor normally operatesTemperature T_max1Comprises the following steps:

$T_{\max 1}=-\frac{1}{3}{T}_{\mathrm{env}}+71;$

wherein, T_envIs the outdoor ambient temperature.

In the above embodiment, preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may be:

when the outdoor environment temperature is more than 7 ℃ and less than or equal to 20 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

T_max1＝65℃。

in the above embodiment, preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may be:

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{14}{T}_{\mathrm{env}}+\frac{875}{14};$

wherein, T_envIs outdoorsThe ambient temperature.

In the above embodiment, preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may be: when the outdoor environment temperature is more than or equal to minus 30 ℃ and less than or equal to minus 7 ℃, the maximum water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{19}{T}_{\mathrm{env}}+\frac{1175}{19};$

wherein, T_envIs the outdoor ambient temperature.

In the above embodiment, preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may be:

when the outdoor environment temperature is less than minus 30 ℃, the maximum water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

T_max1＝53℃。

preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, provided by the embodiment of the present application, is applicable to the air source heat pump water heater in the direct heating mode. The direct heating mode is that cold water is heated once to reach a set temperature, and the temperature difference between inlet water and outlet water is large;

for the air source heat pump water heater in the direct heating mode, the water temperature of the water heater is preferably the water temperature at the water outlet of the water heater.

The embodiment of the application also provides a corresponding relation between the outdoor environment temperature of the air source heat pump water heater applicable to the circulation mode and the highest water temperature of the unit when the compressor normally operates. The circulation mode is that the cold water reaches the set temperature after being heated for many times, and the temperature difference between the inlet water and the outlet water is small, generally about 5 ℃. In this embodiment of the application, the corresponding relationship between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may also be:

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝38℃。

in the above embodiment, preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may be:

when the outdoor environment temperature is more than 25 ℃ and less than or equal to 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=-\frac{6}{20}{T}_{\mathrm{env}}+\frac{1070}{20};$

wherein, T_envIs the outdoor ambient temperature.

In the above embodiment, preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may be:

when the outdoor environment temperature is more than 7 ℃ and less than or equal to 25 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝46℃。

in the above embodiment, preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may be:

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{1}{14}{T}_{\mathrm{env}}+\frac{637}{14};$

wherein, T_envIs the outdoor ambient temperature.

In the above embodiment, preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may be:

when the outdoor environment temperature is more than or equal to minus 30 ℃ and less than or equal to minus 7 ℃, the maximum water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{2}{19}{T}_{\mathrm{env}}+\frac{869}{19};$

wherein, T_envIs the outdoor ambient temperature.

In the above embodiment, preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally may be:

when the outdoor environment temperature is less than minus 30 ℃, the maximum water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝42。

corresponding to the method embodiment, the embodiment of the application also provides a control device, and the control device is applied to a water heater comprising a compressor; a schematic structural diagram of the control device provided in the embodiment of the present application is shown in fig. 2, and may include:

a first obtaining module 21, a second obtaining module 22, a first determining module 23, a second determining module 24 and a control module 25; wherein,

the first obtaining module 21 is used for obtaining the water temperature of the water heater;

the water temperature of the water heater can be the water temperature at the water outlet of the water tank of the water heater or the water temperature at the water inlet of the water tank of the water heater.

The second obtaining module 22 is configured to obtain an outdoor environment temperature value;

the first determining module 23 is configured to determine, according to the obtained outdoor environment temperature and a corresponding relationship between a preset outdoor environment temperature and a maximum unit water temperature when the compressor normally operates, which corresponds to the obtained outdoor environment temperature value;

in the embodiment of the application, the maximum water temperature allowed by the normal operation of the compressor corresponding to the currently acquired outdoor environment temperature can be obtained according to the acquired outdoor environment temperature and the corresponding relation between the preset outdoor environment temperature and the maximum water temperature of the unit when the compressor operates normally.

The second determining module 24 is configured to determine a target water temperature when the water temperature of the water heater is higher than the maximum water temperature of the unit when the compressor normally operates, which corresponds to the obtained outdoor environment temperature value, and the target water temperature is lower than the maximum water temperature of the unit when the compressor normally operates, which corresponds to the obtained outdoor environment temperature value;

in the embodiment of the present application, the determined target water temperature may be lower than a maximum water temperature allowed by normal operation of the compressor corresponding to the acquired outdoor ambient temperature.

The control module 25 is configured to control the compressor according to the target water temperature and the current water temperature of the unit, so that the water temperature in the water heater reaches the target water temperature.

The embodiment of the application provides a control device, which is used for acquiring the water temperature and the outdoor environment temperature of a water heater, and determining the unit maximum water temperature corresponding to the acquired outdoor environment temperature value when a compressor normally operates according to the corresponding relation between the preset outdoor environment temperature and the unit maximum water temperature when the compressor normally operates; when the water temperature of the water heater is higher than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates, determining a target water temperature which is lower than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates; and controlling the compressor according to the target water temperature and the current water temperature of the unit so as to enable the water temperature in the water heater to reach the target water temperature.

That is to say, in the embodiment of the present application, when the water temperature of the water heater is higher than the maximum water temperature of the unit during normal operation of the compressor corresponding to the obtained outdoor environment temperature value, it is indicated that the compressor is operating beyond the range, and at this time, the water temperature of the water heater unit is reduced, so that the compressor is ensured to recover normal operation, and the failure rate of the air source heat pump water heater compressor is reduced.

In the foregoing embodiment, preferably, a schematic structural diagram of the first determining module 23 is shown in fig. 3, and may include:

a first corresponding relation determining unit 31, configured to determine a corresponding relation between an outdoor environment temperature and a maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps: t is_max1＝55℃。

In the foregoing embodiment, preferably, the first determining module 23 may also include:

a second corresponding relation determining unit for determining the corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is more than 20 ℃ and less than or equal to 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=-\frac{1}{3}{T}_{\mathrm{env}}+71;$

wherein, T_envIs the outdoor ambient temperature.

In the foregoing embodiment, preferably, the first determining module 23 may also include:

a third corresponding relation determining unit for determining the corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is more than 7 ℃ and less than or equal to 20 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

T_max1＝65℃。

in the foregoing embodiment, preferably, the first determining module 23 may also include:

a fourth corresponding relation determining unit for determining the corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{14}{T}_{\mathrm{env}}+\frac{875}{14};$

wherein, T_envIs the outdoor ambient temperature.

In the foregoing embodiment, preferably, the first determining module 23 may also include:

a fifth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is more than or equal to minus 30 ℃ and less than or equal to minus 7 ℃, the maximum water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{19}{T}_{\mathrm{env}}+\frac{1175}{19};$

wherein, T_envIs the outdoor ambient temperature.

In the foregoing embodiment, preferably, the first determining module 23 may also include:

a sixth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is less than minus 30 ℃, the maximum water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

T_max1＝53℃。

preferably, the correspondence between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, provided by the embodiment of the present application, is applicable to the air source heat pump water heater in the direct heating mode. The direct heating mode is that cold water is heated once to reach a set temperature, and the temperature difference between inlet water and outlet water is large;

for the air source heat pump water heater in the direct heating mode, the water temperature of the water heater is preferably the water temperature at the water outlet of the water heater.

The embodiment of the application also provides a corresponding relation between the outdoor environment temperature of the air source heat pump water heater applicable to the circulation mode and the highest water temperature of the unit when the compressor normally operates. The circulation mode is that the cold water reaches the set temperature after being heated for many times, and the temperature difference between the inlet water and the outlet water is small, generally about 5 ℃. Another schematic structural diagram of the first determining module 23 is shown in fig. 4, and may include:

a seventh corresponding relation determining unit 41, configured to determine a corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝38℃。

in the foregoing embodiment, preferably, the first determining module 23 may also include:

an eighth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is more than 25 ℃ and less than or equal to 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=-\frac{6}{20}{T}_{\mathrm{env}}+\frac{1070}{20};$

wherein, T_envIs the outdoor ambient temperature.

In the foregoing embodiment, preferably, the first determining module 23 may also include:

a ninth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is more than 7 ℃ and less than or equal to 25 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝46℃。

in the foregoing embodiment, preferably, the first determining module 23 may also include:

a tenth correspondence determining unit for determining a correspondence between the outdoor ambient temperature and a maximum water temperature of the unit at the time of normal operation of the compressor, wherein,

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{1}{14}{T}_{\mathrm{env}}+\frac{637}{14};$

wherein, T_envIs the outdoor ambient temperature.

In the foregoing embodiment, preferably, the first determining module 23 may also include:

an eleventh corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is more than or equal to minus 30 ℃ and less than or equal to minus 7 ℃, the maximum water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{2}{19}{T}_{\mathrm{env}}+\frac{869}{19};$

wherein, T_envIs the outdoor ambient temperature.

In the foregoing embodiment, preferably, the first determining module 23 may also include:

a twelfth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is less than minus 30 ℃, the maximum water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝47。

the embodiment of the application also provides a water heater, which comprises a compressor and the control device in any one of the device embodiments.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (27)

1. A control method is applied to a water heater, wherein a compressor is arranged in the water heater, and is characterized by comprising the following steps:

acquiring the water temperature of a water heater;

acquiring an outdoor environment temperature value;

determining the maximum water temperature of the unit during normal operation of the compressor corresponding to the acquired outdoor environment temperature value according to the corresponding relation between the preset outdoor environment temperature and the maximum water temperature of the unit during normal operation of the compressor;

when the water temperature of the water heater is higher than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates, determining a target water temperature which is lower than the unit maximum water temperature corresponding to the obtained outdoor environment temperature value when the compressor normally operates;

and controlling the compressor according to the target water temperature and the current water temperature of the unit so as to enable the water temperature in the water heater to reach the target water temperature.

2. The method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps: t is_max1＝55℃。

3. The method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is more than 20 ℃ and less than or equal to 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=-\frac{1}{3}{T}_{\mathrm{env}}+71;$

wherein, T_envIs the outdoor ambient temperature.

4. The method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is more than 7 ℃ and less than or equal to 20 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

T_max1＝65℃。

5. the method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{14}{T}_{\mathrm{env}}+\frac{875}{14};$

wherein, T_envIs the outdoor ambient temperature.

6. The method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is more than or equal to minus 30 ℃ and less than or equal to minus 7 ℃, the maximum water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{19}{T}_{\mathrm{env}}+\frac{1175}{19};$

wherein, T_envIs the outdoor ambient temperature.

7. The method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is less than minus 30 ℃, the maximum water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

T_max1＝53℃。

8. the method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝38℃。

9. the method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is more than 25 ℃ and less than or equal to 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=-\frac{6}{20}{T}_{\mathrm{env}}+\frac{1070}{20};$

wherein, T_envIs the outdoor ambient temperature.

10. The method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is more than 7 ℃ and less than or equal to 25 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝46℃。

11. the method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{1}{14}{T}_{\mathrm{env}}+\frac{637}{14};$

wherein, T_envIs the outdoor ambient temperature.

12. The method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is more than or equal to minus 30 ℃ and less than or equal to minus 7 ℃, the maximum water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{2}{19}{T}_{\mathrm{env}}+\frac{869}{19};$

wherein, T_envIs the outdoor ambient temperature.

13. The method of claim 1, wherein the corresponding relationship between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated is as follows:

when the outdoor environment temperature is less than minus 30 ℃, the maximum water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝42。

14. a control device for a water heater comprising a compressor, characterized in that it comprises:

the first acquisition module is used for acquiring the water temperature of the water heater;

the second acquisition module is used for acquiring the outdoor environment temperature value;

the first determining module is used for determining the highest water temperature of the unit during normal operation of the compressor, which corresponds to the acquired outdoor environment temperature value, according to the corresponding relation between the preset outdoor environment temperature and the highest water temperature of the unit during normal operation of the compressor;

a second determining module, configured to determine a target water temperature when the water temperature of the water heater is higher than the maximum water temperature of the unit when the compressor normally operates, which corresponds to the obtained outdoor environment temperature value, and the target water temperature is lower than the maximum water temperature of the unit when the compressor normally operates, which corresponds to the obtained outdoor environment temperature value;

and the control module is used for controlling the compressor according to the target water temperature and the current water temperature of the unit so as to enable the water temperature in the water heater to reach the target water temperature.

15. The apparatus of claim 14, wherein the first determining module comprises:

a first corresponding relation determining unit for determining the corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps: t is_max1＝55℃。

16. The apparatus of claim 14, wherein the first determining module comprises:

a second corresponding relation determining unit for determining the corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is more than 20 ℃ and less than or equal to 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=-\frac{1}{3}{T}_{\mathrm{env}}+71;$

wherein, T_envIs the outdoor ambient temperature.

17. The apparatus of claim 14, wherein the first determining module comprises:

a third corresponding relation determining unit for determining the corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is greater than 7 ℃ and less than or equal to 20 ℃, the compressor normally operatesHighest water temperature T of group_max1Comprises the following steps:

T_max1＝65℃。

18. the apparatus of claim 14, wherein the first determining module comprises:

a fourth corresponding relation determining unit for determining the corresponding relation between the outdoor environment temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{14}{T}_{\mathrm{env}}+\frac{875}{14};$

wherein, T_envIs the outdoor ambient temperature.

19. The apparatus of claim 14, wherein the first determining module comprises:

a fifth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is more than or equal to minus 30 ℃ and less than or equal to minus 7 ℃, the maximum water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

$T_{\max 1}=\frac{5}{19}{T}_{\mathrm{env}}+\frac{1175}{19};$

wherein, T_envIs the outdoor ambient temperature.

20. The apparatus of claim 14, wherein the first determining module comprises:

a sixth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is less than minus 30 ℃, the maximum water temperature T of the unit when the compressor normally operates_max1Comprises the following steps:

T_max1＝53℃。

21. the apparatus of claim 14, wherein the first determining module comprises:

a seventh corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is higher than 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝38℃。

22. the apparatus of claim 14, wherein the first determining module comprises:

an eighth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is more than 25 ℃ and less than or equal to 50 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=-\frac{6}{20}{T}_{\mathrm{env}}+\frac{1070}{20};$

wherein, T_envIs the outdoor ambient temperature.

23. The apparatus of claim 14, wherein the first determining module comprises:

a ninth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is more than 7 ℃ and less than or equal to 25 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝46℃。

24. the apparatus of claim 14, wherein the first determining module comprises:

a tenth correspondence determining unit for determining a correspondence between the outdoor ambient temperature and a maximum water temperature of the unit at the time of normal operation of the compressor, wherein,

when the outdoor environment temperature is more than-7 ℃ and less than or equal to 7 ℃, the highest water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{1}{14}{T}_{\mathrm{env}}+\frac{637}{14};$

wherein, T_envIs the outdoor ambient temperature.

25. The apparatus of claim 14, wherein the first determining module comprises:

an eleventh corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor is normally operated, wherein,

when the outdoor environment temperature is more than or equal to minus 30 ℃ and less than or equal to minus 7 ℃, the maximum water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

$T_{\max 2}=\frac{2}{19}{T}_{\mathrm{env}}+\frac{869}{19};$

wherein, T_envIs the outdoor ambient temperature.

26. The apparatus of claim 14, wherein the first determining module comprises:

a twelfth corresponding relation determining unit for determining a corresponding relation between the outdoor ambient temperature and the maximum water temperature of the unit when the compressor normally operates, wherein,

when the outdoor environment temperature is less than minus 30 ℃, the maximum water temperature T of the unit when the compressor normally operates_max2Comprises the following steps:

T_max2＝42。

27. a water heater comprising a compressor and further comprising a control device as claimed in any one of claims 14 to 26.