Patent Description:
When an outdoor swimming pool is in use, a water temperature thereof is usually too cold or too hot, and user experience is poor. Therefore, a heating device needs to heat water in the swimming pool and keep a constant temperature that a human body feels comfortable. Previously, a device that heats a swimming pool usually uses chemical combustion or electric heating. However, due to problems of high energy consumption, pollution, and electric safety, such device is gradually replaced by a swimming pool heat pump. Because the heat pump can reabsorb heat in the air, by using the reversed Carnot principle, only a small quantity of electric power is required to transfer heat to water in the swimming pool, and energy consumption is greatly reduced. Therefore, the heat pump is popularized.

However, because the swimming pool heat pump uses a compressor system, a compressor and a fan cause energy consumption and noise problems. The conventional compressor system has high energy consumption and does not function well to control the water temperature. <CIT> discloses a swimming pool constant temperature system of an air-source heat pump water heater, which comprises a refrigerating system host, a heat storage and heat insulation water tank, a hot water circulation pipe, a returned water heating pipe, a swimming pool, a swimming pool temperature sensor and a controller; the controller collects and judges the water level and the temperature in the heat storage and heat insulation water tank and the swimming pool in real time, controls the operation of a circulating water pump, ball valves, solenoid valves and the host; the hot water circulation pipe is provided with a first ball valve, a target flow switch, a first circulating water pump, a first water filter, a soft water treatment system and a second ball valve; the heat storage and heat insulation water tank adopts a non-pressure structure, and is provided with a returned water coil heat exchanger, a water tank temperature sensor, a high-water-levels witch and a low-water-level switch; the closed returned water heating pipe is provided with a second circulating water pump, a second water filter and a sewage treatment system; the heat storage and heat insulation water tank and a third circulating water pump are connected with the swimming pool through a water inlet solenoid valve; and the heat storage and heat insulation water tank is connected with a tap water pipe by a water replenishing solenoid valve. <CIT> discloses a heat pump unit and a control method and device thereof. The control method includes: acquiring outdoor environment temperature and the operation mode of the heat pump unit; acquiring the initial flow of a variable-frequency water pump according to the outdoor environment temperature and the operation mode of the heat pump unit, and controlling variable-frequency water pump to output according to the initial flow; acquiring the water temperature difference between the target water outlet temperature of the heat pump unit and the actual water outlet temperature of the heat pump unit, and regulating the operation frequency of a variable-frequency compressor according to the water temperature difference; during the regulating of the operation frequency of the variable-frequency compressor, judging whether the absolute value of water inlet and outlet temperature difference is larger than a preset value or not; if so, regulating the output of the variable-frequency water pump according to the absolute value of the water inlet and outlet temperature difference, and stopping the regulating of the operation frequency of the variable-frequency compressor.

The present invention provides a water temperature control method, apparatus, and device for a swimming pool heat pump system, and a storage medium, so as to adjust a water temperature of a swimming pool according to an external ambient temperature, increase a coefficient of performance during operation of the swimming pool heat pump system, reduce energy consumption, avoid frequent opening and closing of the swimming pool heat pump system, and increase a service life of the swimming pool heat pump system.

A first aspect of embodiments of the present invention provides a water temperature control method for a swimming pool heat pump system, including: obtaining an external ambient temperature and adjusting a heating temperature according to the external ambient temperature to obtain a target heating temperature; detecting an inlet water temperature of the swimming pool heat pump system, and determining an absolute value of a temperature difference between the inlet water temperature and the target heating temperature; and determining a target operating frequency band of the swimming pool heat pump system according to the absolute value of the temperature difference, controlling an inverter compressor in the swimming pool heat pump system to heat water in a to-be-heated container based on the target operating frequency band, and placing heated water in the to-be-heated container into the swimming pool by using a circulating pump.

The obtaining an external ambient temperature and adjusting a heating temperature according to the external ambient temperature to obtain a target heating temperature includes: detecting a current external ambient temperature by using a preset ambient temperature sensor; if the external ambient temperature is less than or equal to a first ambient temperature threshold, determining a first preset temperature as the target heating temperature; if the external ambient temperature is greater than the first ambient temperature threshold and is less than or equal to a second ambient temperature threshold, determining a corresponding target heating temperature according to a preset curve, where the preset curve is used to indicate an inverse ratio relationship between the target heating temperature and the ambient temperature; and if the external ambient temperature is greater than the second ambient temperature threshold, determining a second preset temperature as the target heating temperature, where the second preset temperature is less than the first preset temperature.

A slope of the preset curve is K, <MAT>, where TT<NUM> is the first preset temperature, TT<NUM> is the second preset temperature, AT<NUM> is the first ambient temperature threshold, and AT<NUM> is the second ambient temperature threshold.

Optionally, in a third implementation of the first aspect of the embodiments of the present invention, the determining a target operating frequency band of the swimming pool heat pump system according to the absolute value of the temperature difference, controlling the inverter compressor in the swimming pool heat pump system to heat water in a to-be-heated container based on the target operating frequency band, and placing heated water in the to-be-heated container into the swimming pool by using a circulating pump includes: determining whether the absolute value of the temperature difference is less than a first temperature difference threshold; if the absolute value of the temperature difference is greater than or equal to the first temperature difference threshold, determining that the inverter compressor in the swimming pool heat pump system enters a fast heating stage, where the fast heating stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is a high-frequency operating frequency band; if the absolute value of the temperature difference is less than the first temperature difference threshold, determining whether the absolute value of the temperature difference is less than a second temperature difference threshold; if the absolute value of the temperature difference is greater than or equal to the second temperature difference threshold, determining that the inverter compressor in the swimming pool heat pump system enters an energy-saving heating stage, where the energy-saving heating stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is an intermediate-frequency operating frequency band; if the absolute value of the temperature difference is less than the second temperature difference threshold, determining that the inverter compressor in the swimming pool heat pump system enters a constant temperature maintenance stage, where the constant temperature maintenance stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is a low-frequency operating frequency band; and controlling the inverter compressor to heat the water in the to-be-heated container based on the high-frequency operating frequency band, the intermediate-frequency operating frequency band, or the low-frequency operating frequency band, and placing the heated water in the to-be-heated container into the swimming pool by using the circulating pump.

Optionally, in a fourth implementation of the first aspect of the embodiments of the present invention, the first temperature difference threshold is <NUM>, and the second temperature difference threshold is <NUM>.

Optionally, in a fifth implementation of the first aspect of the embodiments of the present invention, the controlling the inverter compressor to heat the water in the to-be-heated container based on the high-frequency operating frequency band, the intermediate-frequency operating frequency band, or the low-frequency operating frequency band, and placing the heated water in the to-be-heated container into the swimming pool by using the circulating pump includes: adjusting a real-time operating frequency of the inverter compressor according to a change of the absolute value of the temperature difference, and heating the water in the to-be-heated container according to the real-time operating frequency, where the real-time operating frequency is the high-frequency operating frequency band, the intermediate-frequency operating frequency band, or the low-frequency operating frequency band; when the inverter compressor operates in the high-frequency operating frequency band, determining that a value range of a current heat production amount of the swimming pool heat pump system is [<NUM>. 2Q], and a value range of a coefficient of performance (COP) corresponding to the swimming pool heat pump system is <NUM> ≤ COP ≤ <NUM>, where Q is a maximum heat production amount of the swimming pool heat pump system; when the inverter compressor operates in the intermediate-frequency operating frequency band, determining that the value range of the current heat production amount of the swimming pool heat pump system is (<NUM>. 8Q), and the value range of the coefficient of performance (COP) corresponding to the swimming pool heat pump system is <NUM> < COP < <NUM> ; and when the inverter compressor operates in the low-frequency operating frequency band, determining that the value range of the current heat production amount of the swimming pool heat pump system is [<NUM>. 05Q, <NUM>. 4Q], and the value range of the coefficient of performance (COP) corresponding to the swimming pool heat pump system is <NUM> ≤ COP ≤ <NUM>.

Optionally, in a sixth implementation of the first aspect of the embodiments of the present invention, when the inverter compressor operates in the low-frequency operating frequency band, the inverter compressor keeps operating.

A second aspect of the embodiments of the present invention provides a water temperature control apparatus for a swimming pool heat pump system, including: an obtaining and adjustment module, configured to obtain an external ambient temperature and adjust a heating temperature according to the external ambient temperature to obtain a target heating temperature; a detection and determining module, configured to: detect an inlet water temperature of the swimming pool heat pump system, and determine an absolute value of a temperature difference between the inlet water temperature and the target heating temperature; and a determining and control module, configured to: determine a target operating frequency band of the swimming pool heat pump system according to the absolute value of the temperature difference, control the inverter compressor in the swimming pool heat pump system to heat water in a to-be-heated container based on the target operating frequency band, and place heated water in the to-be-heated container into the swimming pool by using a circulating pump.

The obtaining and adjustment module is specifically configured to: detect a current external ambient temperature by using a preset ambient temperature sensor; if the external ambient temperature is less than or equal to a first ambient temperature threshold, determine a first preset temperature as the target heating temperature; if the external ambient temperature is greater than the first ambient temperature threshold and is less than or equal to a second ambient temperature threshold, determine a corresponding target heating temperature according to a preset curve, where the preset curve is used to indicate an inverse ratio relationship between the target heating temperature and the ambient temperature; and if the external ambient temperature is greater than the second ambient temperature threshold, determine a second preset temperature as the target heating temperature, where the second preset temperature is less than the first preset temperature.

Optionally, in a third implementation of the second aspect of the embodiments of the present invention, the determining and control module includes: a first judgement unit, configured to determine whether the absolute value of the temperature difference is less than a first temperature difference threshold; a first determining unit, configured to: if the absolute value of the temperature difference is greater than or equal to the first temperature difference threshold, determine that the inverter compressor in the swimming pool heat pump system enters a fast heating stage, where the fast heating stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is a high-frequency operating frequency band; a second judgment unit, configured to: if the absolute value of the temperature difference is less than the first temperature difference threshold, determine whether the absolute value of the temperature difference is less than a second temperature difference threshold; a second determining unit, configured to: if the absolute value of the temperature difference is greater than or equal to the second temperature difference threshold, determine that the inverter compressor in the swimming pool heat pump system enters an energy-saving heating stage, where the energy-saving heating stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is an intermediate-frequency operating frequency band; a third determining unit, configured to: if the absolute value of the temperature difference is less than the second temperature difference threshold, determine that the inverter compressor in the swimming pool heat pump system enters a constant temperature maintenance stage, where the constant temperature maintenance stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is a low-frequency operating frequency band; and a heating unit, configured to control the inverter compressor to heat the water in the to-be-heated container based on the high-frequency operating frequency band, the intermediate-frequency operating frequency band, or the low-frequency operating frequency band, and place the heated water in the to-be-heated container into the swimming pool by using the circulating pump.

Optionally, in a fourth implementation of the second aspect of the embodiments of the present invention, the first temperature difference threshold is <NUM>, and the second temperature difference threshold is <NUM>.

Optionally, in a fifth implementation of the second aspect of the embodiments of the present invention, the heating unit is specifically configured to: adjust a real-time operating frequency of the inverter compressor according to a change of the absolute value of the temperature difference, and heat the water in the to-be-heated container according to the real-time operating frequency, where the real-time operating frequency is the high-frequency operating frequency band, the intermediate-frequency operating frequency band, or the low-frequency operating frequency band; when the inverter compressor operates in the high-frequency operating frequency band, determine that a value range of a current heat production amount of the swimming pool heat pump system is [<NUM>. 2Q], and a value range of a coefficient of performance (COP) corresponding to the swimming pool heat pump system is <NUM> ≤ COP ≤ <NUM>, where Q is a maximum heat production amount of the swimming pool heat pump system; when the inverter compressor operates in the intermediate-frequency operating frequency band, determine that the value range of the current heat production amount of the swimming pool heat pump system is (<NUM>. 8Q), and the value range of the coefficient of performance (COP) corresponding to the swimming pool heat pump system is <NUM> < COP ≤ <NUM> ; and when the inverter compressor operates in the low-frequency operating frequency band, determine that the value range of the current heat production amount of the swimming pool heat pump system is [<NUM>. 05Q, <NUM>. 4Q], and the value range of the coefficient of performance (COP) corresponding to the swimming pool heat pump system is <NUM> ≤ COP ≤ <NUM>.

Optionally, in a sixth implementation of the second aspect of the embodiments of the present invention, when the inverter compressor operates in the low-frequency operating frequency band, the inverter compressor keeps operating.

A third aspect of the embodiments of the present invention provides a water temperature control device for a swimming pool heat pump system, a memory, and at least one processor, where the memory stores instructions, and the memory and the at least one processor are interconnected by using a line; the at least one processor invokes the instructions in the memory, so that the water temperature control device for a swimming pool heat pump system performs the water temperature control method for a swimming pool heat pump system.

A fourth aspect of the embodiments of the present invention provides a computer readable storage medium, where the computer readable storage medium stores instructions, and when the instructions are executed by a processor, steps of the water temperature control method for a swimming pool heat pump system in any one of the foregoing implementations are implemented.

The technical solutions provided in the embodiments of the present invention include: obtaining an external ambient temperature and adjusting a heating temperature according to the external ambient temperature to obtain a target heating temperature; detecting an inlet water temperature of the swimming pool heat pump system, and determining an absolute value of a temperature difference between the inlet water temperature and the target heating temperature; and determining a target operating frequency band of the swimming pool heat pump system according to the absolute value of the temperature difference, controlling an inverter compressor in the swimming pool heat pump system to heat water in a to-be-heated container based on the target operating frequency band, and placing heated water in the to-be-heated container into the swimming pool by using a circulating pump. In the embodiments of the present invention, the target heating temperature is adjusted according to the external ambient temperature, and the swimming pool water temperature is further adjusted according to the standard heating temperature, so as to increase a coefficient of performance of the swimming pool heat pump system during operation, reduce energy consumption, avoid frequent opening and closing of the swimming pool heat pump system, and increase a service life of the swimming pool heat pump system.

To make persons skilled in the art better understand the solutions in the present invention, the following describes the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention.

In the specification, claims, and accompanying drawings of the present invention, the terms "first", "second", "third", "fourth", and so on (if any) are intended to distinguish between similar objects but do not necessarily indicate a specific order or sequence. It should be understood that the terms used in such a way are interchangeable in proper circumstances, so that the embodiments described herein can be implemented in other orders than the order illustrated or described herein. Moreover, the terms "include", "contain" and any other variants mean to cover the non-exclusive inclusion, for example, a process, method, system, product, or device that includes a list of steps or units is not necessarily limited to those expressly listed steps or units, but may include other steps or units not expressly listed or inherent to such a process, method, system, product, or device.

<FIG> is a flowchart of a water temperature control method for a swimming pool heat pump system according to an embodiment of the present invention, specifically including:
<NUM>. Obtain an external ambient temperature and adjust a heating temperature according to the external ambient temperature to obtain a target heating temperature.

A terminal obtains the external ambient temperature and adjusts the heating temperature according to the external ambient temperature to obtain the target heating temperature.

It should be noted that the heat pump system may be applied to a swimming pool water heating scenario, and the target heating temperature is adjusted in real time for a swimming pool internal water temperature and the external ambient temperature to meet a use requirement. Before a swimming pool is put into use, the swimming pool internal water temperature is relatively low. In this case, there are two types of requirements. One is that the temperature inside the swimming pool is expected to reach a specified temperature as quickly as possible. The other is scheduled heating, where duration may be relatively long, and energy consumption is expected to be low. The swimming pool water temperature heated by the swimming pool heat pump can fluctuate slightly, so that a human body feels comfortable. The swimming pool water temperature can be adjusted automatically according to the external ambient temperature. For example, when the external ambient temperature is relatively high (that is, the weather is relatively hot), the water temperature may be set to be slightly lower than the usual temperature, so that the human body can feel more comfortable and energy can be saved. When the ambient temperature is relatively low (that is, the weather is relatively cold), the target heating temperature may be set to be higher than the usual temperature.

It may be understood that the execution body of the present invention may be a water temperature control apparatus for a swimming pool heat pump system, or may be a terminal, which is not specifically limited herein. In this embodiment of the present invention, that the terminal is an execution body is used as an example for description.

Detect an inlet water temperature of the swimming pool heat pump system, and determine an absolute value of a temperature difference between the inlet water temperature and the target heating temperature.

The terminal detects the inlet water temperature of the swimming pool heat pump system, and determines the absolute value of the temperature difference between the inlet water temperature and the target heating temperature. The absolute value of the temperature difference is an absolute value of a difference obtained by subtracting the inlet water temperature from the target heating temperature.

It may be understood that different absolute values of temperature differences also correspond to different operating frequencies of the heat pump system. Therefore, different heating manners are separately delimited by setting different temperature difference ranges.

Determine a target operating frequency band of the swimming pool heat pump system according to the absolute value of the temperature difference, control the inverter compressor in the swimming pool heat pump system to heat water in a to-be-heated container based on the target operating frequency band, and place heated water in the to-be-heated container into the swimming pool by using a circulating pump.

Specifically, if the absolute value of the temperature difference is greater than or equal to a first temperature difference threshold, the terminal determines that the inverter compressor in the swimming pool heat pump system enters a fast heating stage, where the fast heating stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is a high-frequency operating frequency band. If the absolute value of the temperature difference is greater than or equal to a second temperature difference threshold and is less than the first temperature difference threshold, the terminal determines that the inverter compressor enters an energy-saving heating stage, where the energy-saving heating stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is an intermediate-frequency operating frequency band. If the absolute value of the temperature difference is less than the second temperature difference threshold, the terminal determines that the inverter compressor enters a constant temperature maintenance stage, where the constant temperature maintenance stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is a low-frequency operating frequency band. The terminal controls the inverter compressor to heat the water in the to-be-heated container based on the high-frequency operating frequency band, the intermediate-frequency operating frequency band, or the low-frequency operating frequency band, and then places the heated water in the to-be-heated container into the swimming pool by using the circulating pump, so as to continuously increase the water temperature in the swimming pool, so that the water temperature in the swimming pool is maintained at the target heating temperature.

In this embodiment of the present invention, the target heating temperature is adjusted according to the external ambient temperature, and the swimming pool water temperature is further adjusted according to the standard heating temperature, so as to increase a coefficient of performance of the swimming pool heat pump system during operation, reduce energy consumption, avoid frequent opening and closing of the swimming pool heat pump system, and increase a service life of the swimming pool heat pump system.

<FIG> is another flowchart of a water temperature control method for a swimming pool heat pump system according to an embodiment of the present invention, specifically including:
<NUM>. Obtain an external ambient temperature and adjust a heating temperature according to the external ambient temperature to obtain a target heating temperature.

Specifically, the terminal detects a current external ambient temperature by using a preset ambient temperature sensor; if the external ambient temperature is less than or equal to a first ambient temperature threshold, determines a first preset temperature as the target heating temperature; if the external ambient temperature is greater than the first ambient temperature threshold and is less than or equal to a second ambient temperature threshold, determines a corresponding target heating temperature according to a preset curve, where the preset curve is used to indicate an inverse ratio relationship between the target heating temperature and the ambient temperature; and if the external ambient temperature is greater than the second ambient temperature threshold, determines a second preset temperature as the target heating temperature, where the second preset temperature is less than the first preset temperature.

It should be noted that the swimming pool heat pump system is applied to a swimming pool water heating scenario, and the target heating temperature is adjusted in real time for a swimming pool internal water temperature and the external ambient temperature to meet a use requirement. Before a swimming pool is put into use, the swimming pool internal water temperature is relatively low. In this case, there are two types of requirements. One is that the temperature inside the swimming pool is expected to reach a specified temperature as quickly as possible. The other is scheduled heating, where duration may be relatively long, and energy consumption is expected to be low. The swimming pool water temperature heated by the swimming pool heat pump can fluctuate slightly, so that a human body feels comfortable. The swimming pool water temperature can be adjusted automatically according to the external ambient temperature. For example, when the external ambient temperature is relatively high (that is, the weather is relatively hot), the water temperature may be set to be slightly lower than the usual temperature, so that the human body can feel more comfortable and energy can be saved. When the ambient temperature is relatively low (that is, the weather is relatively cold), the target heating temperature may be set to be higher than the usual temperature. When the external ambient temperature is higher, the target heating temperature is set to be lower. The target heating temperature is inversely proportional to the external ambient temperature within a preset range. The preset range is from the first preset temperature to the second preset temperature, and the first preset temperature is greater than the second preset temperature.

A slope of the preset curve is K, as shown in <FIG>, <MAT>, where TT<NUM> is the first preset temperature, TT<NUM> is the second preset temperature, AT<NUM> is the first ambient temperature threshold, AT<NUM> is the second ambient temperature threshold, that is, a preset temperature difference is a difference between the first preset temperature and the second preset temperature, an ambient temperature difference is a difference between the first ambient temperature and the second ambient temperature, the preset temperature difference is inversely proportional to the ambient temperature difference, and a value range of K may be [-<NUM>, -<NUM>]. Specifically, when the external ambient temperature is greater than AT2, the inverter compressor of the swimming pool heat pump system operates at a target heating temperature of TT2. When the external ambient temperature is greater than AT1 and is less than or equal to AT2, the inverter compressor of the swimming pool heat pump system operates at the target heating temperature which is a value determined according to the preset curve. When the external ambient temperature is less than or equal to AT1, the inverter compressor of the swimming pool heat pump system operates at a target heating temperature of TT1. Alternatively, the preset curve is an arc (raised to the lower left corner), and the slope K of the curve increases with the ambient temperature, that is, a higher external ambient temperature causes a slower change rate of the target heating temperature, and a lower external ambient temperature causes a faster change rate of the target heating temperature.

According to the foregoing correction to the target heating temperature, according to a principle of the swimming pool heat pump system, each time a difference from the target heating temperature is <NUM>, the coefficient of performance (COP) of the swimming pool heat pump system is <NUM>-<NUM>% different, and when the water temperature is lower, the COP is higher. Therefore, in this embodiment, the swimming pool heat pump system can be improved to obtain a higher energy efficiency in a case of a higher ambient temperature, thereby further reducing energy consumption.

Specifically, the inlet water temperature of the swimming pool heat pump system is detected, the inlet water temperature of the swimming pool heat pump system is subtracted from the target heating temperature to obtain a difference, and an absolute value of the difference is obtained. Different absolute values of temperature differences also correspond to different operating frequencies of the swimming pool heat pump system. Therefore, different heating manners are separately delimited by setting different temperature difference ranges.

The inlet water temperature of the swimming pool heat pump system may be lower than or equal to the target heating temperature, or may be higher than the target heating temperature. When the inlet water temperature of the swimming pool heat pump system is lower than or equal to the target heating temperature, the difference is a positive value, and the absolute value of the difference is also a positive value. When the inlet water temperature of the swimming pool heat pump system is higher than the target heating temperature, that is, the pool water temperature is over high, the difference is a negative number, and the absolute value must be taken to obtain a positive value.

Determine whether the absolute value of the temperature difference is less than a first temperature difference threshold.

The terminal determines whether the absolute value of the temperature difference is less than the first temperature difference threshold.

If the absolute value of the temperature difference is greater than or equal to the first temperature difference threshold, determine that the inverter compressor in the swimming pool heat pump system enters a fast heating stage, where the fast heating stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is a high-frequency operating frequency band.

If the absolute value of the temperature difference is greater than or equal to the first temperature difference threshold, the terminal determines that the inverter compressor in the swimming pool heat pump system enters the fast heating stage, where the fast heating stage is used to indicate that the target operating frequency band of the heat pump system is the high-frequency operating frequency band. For example, the first temperature difference threshold is <NUM>. When the absolute value of the temperature difference is greater than or equal to <NUM>, it may be determined that the temperature difference from the target temperature is relatively large. In this case, the swimming pool water temperature needs to be increased quickly, so that the temperature difference decreases as soon as possible. It is assumed that when the terminal determines that the target heating temperature is <NUM>, the swimming pool heat pump system enables a circulating pump, detects that a current inlet water temperature Ti of the heat pump is <NUM>, and the absolute value of the temperature difference is <NUM>. The temperature difference from the target heating temperature <NUM> is relatively large. In this case, the swimming pool water temperature needs to be increased quickly, so that the temperature difference decreases as soon as possible. When the absolute value of the temperature difference is greater than or equal to <NUM>, the fast heating stage is entered. At this stage, the inverter compressor is operating in the high frequency band, and generally outputs a heat production amount according to <NUM>%-<NUM>% of a maximum heat production amount, that is, [<NUM>. 2Q], and a COP operating range is <NUM> ≤ COP ≤ <NUM>, where Q is the maximum heat production amount of the swimming pool heat pump system.

If the absolute value of the temperature difference is less than the first temperature difference threshold, determine whether the absolute value of the temperature difference is less than a second temperature difference threshold.

If the absolute value of the temperature difference is less than the first temperature difference threshold, the terminal continues to determine whether the absolute value of the temperature difference is less than the second temperature difference threshold. For example, the first temperature difference threshold is <NUM>, and the second temperature difference threshold is <NUM>.

If the absolute value of the temperature difference is greater than or equal to the second temperature difference threshold and is less than the first temperature difference threshold, determine that the inverter compressor in the swimming pool heat pump system enters an energy-saving heating stage, where the energy-saving heating stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is an intermediate-frequency operating frequency band.

If the absolute value of the temperature difference is greater than or equal to the second temperature difference threshold and is less than the first temperature difference threshold, the terminal determines that the inverter compressor in the swimming pool heat pump system enters the energy-saving heating stage, where the energy-saving heating stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is the intermediate-frequency operating frequency band.

For example, when the absolute value of the temperature difference is greater than <NUM> and is less than or equal to <NUM>, the energy-saving heating stage is entered. At this stage, the inverter compressor in the swimming pool heat pump system operates in the intermediate frequency band, and generally outputs a heat production amount according to <NUM>%-<NUM>% of the maximum heat production amount, that is, (<NUM>. 8Q), and a COP operating range is <NUM> < COP < <NUM>.

If the absolute value of the temperature difference is less than the second temperature difference threshold, determine that the inverter compressor in the swimming pool heat pump system enters a constant temperature maintenance stage, where the constant temperature maintenance stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is a low-frequency operating frequency band.

If the absolute value of the temperature difference is less than the second temperature difference threshold, the terminal determines that the inverter compressor in the swimming pool heat pump system enters the constant temperature maintenance stage, where the constant temperature maintenance stage is used to indicate that the target operating frequency band of the swimming pool heat pump system is the low-frequency operating frequency band.

When the absolute value of the temperature difference is less than <NUM>, the constant temperature maintenance stage is entered. At this stage, the inverter compressor operates in the low frequency band, and usually outputs a heat production amount according to <NUM>%-<NUM>% of the maximum heat production amount, that is, [<NUM>. 05Q, <NUM>. 4Q], and the COP operating range is <NUM> ≤ COP ≤ <NUM>. When the absolute value of the temperature difference is less than <NUM> and the target heating temperature is greater than the actual temperature of the swimming pool water temperature, output is performed according to <NUM>%-<NUM>% (including <NUM>% but not including <NUM>%) of the maximum heat production amount. When the absolute value of the temperature difference is less than <NUM> and the target heating temperature is greater than the actual temperature of the swimming pool water temperature, output is performed according to <NUM>%-<NUM>% (including <NUM>% and <NUM>%) of the maximum heat production amount. It should be noted that when heating is performed according to <NUM>% of the maximum heat production amount, the COP corresponding to the swimming pool heat pump system is <NUM>; and when heating is performed according to <NUM>% of the maximum heat production amount, the COP corresponding to the swimming pool heat pump system is <NUM>.

It should be noted that, in the high-frequency operating frequency band, the intermediate-frequency operating frequency band, or the low-frequency operating frequency band, the terminal may further adjust the operating frequency of the inverter compressor in real time, thereby gradually reducing the actual operating frequency, so that the COP is always at a maximum value.

Control the inverter compressor to heat the water in the to-be-heated container based on the high-frequency operating frequency band, the intermediate-frequency operating frequency band, or the low-frequency operating frequency band, and place the heated water in the to-be-heated container into the swimming pool by using the circulating pump.

Specifically, the terminal adjusts a real-time operating frequency of the inverter compressor according to a change of the absolute value of the temperature difference, and heats the water in the to-be-heated container according to the real-time operating frequency, where the real-time operating frequency is the high-frequency operating frequency band, the intermediate-frequency operating frequency band, or the low-frequency operating frequency band; when the inverter compressor operates in the high-frequency operating frequency band, determines that a value range of a current heat production amount of the swimming pool heat pump system is [<NUM>. 2Q], and a value range of a coefficient of performance (COP) corresponding to the swimming pool heat pump system is <NUM> ≤ COP ≤ <NUM>, where Q is a maximum heat production amount of the swimming pool heat pump system; when the inverter compressor operates in the intermediate-frequency operating frequency band, determines that the value range of the current heat production amount of the swimming pool heat pump system is (<NUM>. 8Q), and the value range of the coefficient of performance (COP) corresponding to the swimming pool heat pump system is <NUM> < COP < <NUM>; and when the inverter compressor operates in the low-frequency operating frequency band, determines that the value range of the current heat production amount of the swimming pool heat pump system is [<NUM>. 05Q, <NUM>. 4Q], and the value range of the coefficient of performance (COP) corresponding to the swimming pool heat pump system is <NUM> ≤ COP ≤ <NUM>, as shown in <FIG>.

When the temperature difference is relatively large (not less than the first temperature difference threshold), the terminal first controls the inverter compressor to operate in the high-frequency operating frequency band, where as the inverter compressor operates, the temperature difference gradually decreases (less than the second temperature difference threshold); controls the inverter compressor to operate in the intermediate-frequency operating frequency band; and when the temperature difference is maintained around the target heating temperature (for example, <NUM> above or below the target heating temperature), controls the inverter compressor to operate in the low-frequency operating frequency band and maintain the low-frequency operating frequency band, so that the COP of the heat pump system is the maximum value at each operating stage.

In this embodiment, a characteristic that the inverter compressor in the swimming pool heat pump system can adjust the heat production output amount is fully used. According to an actual water temperature situation of the swimming pool, the maximum heat production amount is obtained by increasing a rotation speed of the compressor in a low temperature interval, so that the water temperature is rapidly increased. In this case, because the water temperature is relatively low, a condensing temperature is relatively low, and the COP is maintained at a relatively high level. As the water temperature rises to an intermediate temperature interval, condensation efficiency decreases. If a higher rotation speed is maintained, the COP decreases. Therefore, by reducing the rotation speed of the compressor (reducing frequency), a gas displacement volume of the compressor decreases. In this way, a heat exchange area between an evaporator and a condenser is fully used to compensate for a COP decrease caused by raising of the water temperature, and relatively low frequency is used to obtain the maximum COP. In the intermediate temperature interval, as the water temperature rises, the frequency of the compressor decreases further. Finally, when the water temperature reaches the target temperature, the frequency of the compressor just outputs the most appropriate frequency, so that the heat provided by the swimming pool heat pump can balance the heat dissipation loss of the swimming pool water temperature and the outside. In this case, the swimming pool water temperature does not continuously increase at a large temperature difference and fluctuates within a range of ±<NUM>.

It should be noted that, in this embodiment, the inverter compressor of the swimming pool heat pump system is not stopped, and is always maintained at a relatively low frequency. In this case, the maximum COP can be obtained, the swimming pool water temperature does not fluctuate greatly, and a human body feels more comfortable, thereby avoiding a damage to a service life of a component caused by frequent opening/closing.

The foregoing describes the water temperature control method for a swimming pool heat pump system in the embodiments of the present invention. The following describes a water temperature control apparatus for a swimming pool heat pump system in the embodiments of the present invention. Referring to <FIG>, an embodiment of the water temperature control apparatus for a swimming pool heat pump system according to an embodiment of the present invention includes:.

Referring to <FIG>, another embodiment of a water temperature control apparatus for a swimming pool heat pump system according to an embodiment of the present invention includes:.

Optionally, the obtaining and adjustment module <NUM> is specifically configured to:.

Optionally, a slope of the preset curve is K, <MAT>, where TT<NUM> is the first preset temperature, TT<NUM> is the second preset temperature, AT<NUM> is the first ambient temperature threshold, and AT<NUM> is the second ambient temperature threshold.

Optionally, the determining and control module <NUM> includes:.

Optionally, the first temperature difference threshold is <NUM>, and the second temperature difference threshold is <NUM>.

Optionally, the heating unit <NUM> is specifically configured to:.

Optionally, when the inverter compressor operates in the low-frequency operating frequency band, the inverter compressor keeps operating.

<FIG> describe in detail the water temperature control apparatus for a swimming pool heat pump system in the embodiments of the present invention from a perspective of a modular functional entity. The following describes in detail a water temperature control device for a swimming pool heat pump system in the embodiments of the present invention from a perspective of hardware processing.

<FIG> is a schematic structural diagram of a water temperature control device for a swimming pool heat pump system according to an embodiment of the present invention. The water temperature control device <NUM> for a swimming pool heat pump system may vary greatly according to configuration or performance. The water temperature control device <NUM> may include one or more processors (central processing unit, CPU) <NUM> (for example, one or more processors) and a memory <NUM>, and one or more storage media <NUM> (for example, one or more mass storage devices) storing an application program <NUM> or data <NUM>. The memory <NUM> and the storage medium <NUM> may be used for transient storage or persistent storage. The program stored in the storage medium <NUM> may include one or more modules (not shown in the figure), and each module may include a series of instruction operations for the water temperature control device <NUM> for a swimming pool heat pump system. Further, the processor <NUM> may be configured to communicate with the storage medium <NUM> and perform a series of instruction operations in the storage medium <NUM> on the water temperature control device <NUM> for a swimming pool heat pump system.

The water temperature control device <NUM> for a swimming pool heat pump system may further include one or more power supplies <NUM>, one or more wired or wireless network interfaces <NUM>, one or more input/output interfaces <NUM>, and/or one or more operating systems <NUM>, such as Windows Server, Mac OS X, Unix, Linux, and FreeBSD. A person skilled in the art may understand that a structure of the water temperature control device for a swimming pool heat pump system shown in <FIG> does not constitute a limitation on the water temperature control device for a swimming pool heat pump system, which may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

The present invention further provides a computer readable storage medium. The computer readable storage medium may be a non-volatile computer readable storage medium. The computer readable storage medium may also be a volatile computer readable storage medium. The computer readable storage medium stores instructions. When the instructions run on a computer, the computer performs the steps of the water temperature control method for a swimming pool heat pump system.

Claim 1:
A water temperature control method for a swimming pool heat pump system, wherein the heat pump system comprises an inverter compressor, and the method comprises:
<NUM>, <NUM>: obtaining an external ambient temperature and adjusting a heating temperature according to the external ambient temperature to obtain a target heating temperature;
<NUM>, <NUM>: detecting an inlet water temperature of the swimming pool heat pump system, and determining an absolute value of a temperature difference between the inlet water temperature and the target heating temperature; and
<NUM>: determining a target operating frequency band of the swimming pool heat pump system according to the absolute value of the temperature difference, controlling the inverter compressor in the swimming pool heat pump system to heat water in a to-be-heated container based on the target operating frequency band, and placing heated water in the to-be-heated container into the swimming pool by using a circulating pump,
wherein the obtaining an external ambient temperature and adjusting a heating temperature according to the external ambient temperature to obtain a target heating temperature comprises:
detecting a current external ambient temperature by using a preset ambient temperature sensor;
if the external ambient temperature is less than or equal to a first ambient temperature threshold, determining a first preset temperature as the target heating temperature;
if the external ambient temperature is greater than the first ambient temperature threshold and is less than or equal to a second ambient temperature threshold, determining a corresponding target heating temperature according to a preset curve, wherein the preset curve is used to indicate an inverse ratio relationship between the target heating temperature and the ambient temperature; and
if the external ambient temperature is greater than the second ambient temperature threshold, determining a second preset temperature as the target heating temperature, wherein the second preset temperature is less than the first preset temperature,
wherein:
a slope of the preset curve is K, <MAT>, wherein TT1 is the first preset temperature, TT<NUM> is the second preset temperature, AT<NUM> is the first ambient temperature threshold, and AT2 is the second ambient temperature threshold.