Control method and control device of heat pump system and heat pump system

Abstract

The invention provides a control method and device of a heat pump system and the heat pump system. The control method comprises the steps that the current working mode of the heat pump system and the outdoor environment temperature are obtained; determining a to-be-adjusted pressure parameter of the heat pump system according to the current working mode, and calculating a target parameter value of the to-be-adjusted pressure parameter according to the outdoor environment temperature; and working parameters of a frequency conversion fan are controlled and adjusted according to the target parameter value, so that the to-be-adjusted pressure parameter of the heat pump system reaches the target parameter value. According to the control method and the control device of the heat pump system and the heat pump system, the relation between the outdoor environment temperature and the target parameter value of the to-be-adjusted pressure parameter is established, the to-be-adjusted pressure parameter currently needed by the heat pump system and the target parameter value of the to-be-adjusted pressure parameter can be rapidly determined, then the system can be rapidly balanced, and the service life of the system is prolonged. And the self-adjustment time of the system is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly to a control method, a control device and a heat pump system for a heat pump system. Background Art

[0002] In the related art, current heat pump water heaters are usually controlled according to the original air-conditioning fluorine machine system. Generally, during heating, control is performed according to the target high-pressure pressure or the saturation temperature corresponding to the target high-pressure pressure. However, this kind of control often ignores the influence of the low-pressure pressure or the saturation temperature corresponding to the low-pressure pressure at different ambient temperatures on the system control, and can only passively control the low-pressure pressure or the low-pressure saturation temperature through the fan. This system control process is relatively long, and the time to reach the equilibrium state is also relatively long, resulting in a large amount of energy waste.

[0003] Similarly, during system refrigeration, control is performed according to the target low-pressure pressure or the saturation temperature corresponding to the target low-pressure pressure. However, this kind of control often ignores the influence of the high-pressure pressure or the saturation temperature corresponding to the high-pressure pressure at different ambient temperatures on the system control, and can only passively control the high-pressure pressure or the high-pressure saturation temperature through the fan. This system control process is relatively long, and the time to reach the equilibrium state is also relatively long, resulting in a large amount of energy waste. Summary of the Invention

[0004] The present invention provides a control method, a control device and a heat pump system for a heat pump system to solve the defects existing in the prior art and achieve the following technical effects: By establishing a relational expression associating the outdoor ambient temperature with the target parameter value of the pressure parameter to be adjusted, the pressure parameter to be adjusted currently required by the heat pump system and its target parameter value can be quickly determined, and then the system can quickly reach a balance, greatly reducing the system self-adjustment time.

[0005] The control method for a heat pump system according to the first aspect embodiment of the present invention includes:

[0006] Obtain the current working mode of the heat pump system and the outdoor ambient temperature;

[0007] Determine the pressure parameter to be adjusted of the heat pump system according to the current working mode, and calculate the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature;

[0008] Control and adjust the working parameters of the variable-frequency fan according to the target parameter value so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value.

[0009] According to an embodiment of the present invention, after the step of obtaining the current working mode of the heat pump system and the outdoor ambient temperature, it further includes:

[0010] When the heat pump system is in the heating mode, control the high-pressure pressure parameter of the heat pump system to reach the set high-pressure pressure parameter value;

[0011] Or, when the heat pump system is in the cooling mode, control the low-pressure pressure parameter of the heat pump system to reach the set low-pressure pressure parameter value.

[0012] According to an embodiment of the present invention, after the step of obtaining the current working mode and the outdoor ambient temperature of the heat pump system, it further includes: obtaining the target outlet water temperature Tset of the heat pump system;

[0013] Then the set high-pressure pressure parameter value includes setting a high-pressure pressure protection temperature Pd_t, and the set high-pressure pressure protection temperature Pd_t = Tset + α (α is a constant); or, the set low-pressure pressure parameter value includes setting a low-pressure pressure protection temperature Ps_t, and the set low-pressure pressure protection temperature Ps_t = Tset - β (β is a constant).

[0014] According to an embodiment of the present invention, the step of determining the pressure parameter to be adjusted of the heat pump system according to the current working mode specifically includes:

[0015] If the current working mode is the heating mode, determine that the pressure parameter to be adjusted of the heat pump system is the low-pressure pressure parameter;

[0016] Wherein, the low-pressure pressure parameter includes low-pressure pressure and / or low-pressure pressure protection temperature.

[0017] According to an embodiment of the present invention, the step of calculating the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature specifically includes:

[0018] When the outdoor ambient temperature is less than the first set temperature, calculate that the target parameter value of the low-pressure pressure protection temperature is the first low-pressure temperature value;

[0019] When the outdoor ambient temperature is greater than or equal to the first set temperature and less than the second set temperature, calculate that the target parameter value of the low-pressure pressure protection temperature is the second low-pressure temperature value;

[0020] When the outdoor ambient temperature is greater than or equal to the second set temperature, calculate that the target parameter value of the low-pressure pressure protection temperature is the third low-pressure temperature value;

[0021] Wherein, the first low-pressure temperature value is greater than the second low-pressure temperature value, the second low-pressure temperature value is greater than or equal to the third low-pressure temperature value, and the first low-pressure temperature value, the second low-pressure temperature value and the third low-pressure temperature value are respectively positively correlated with the outdoor ambient temperature.

[0022] According to an embodiment of the present invention, the step of controlling and adjusting the operating parameters of the variable-frequency fan according to the target parameter value so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value specifically includes:

[0023] When the target parameter value is the first low-pressure temperature value, controlling and adjusting the rotational speed of the variable-frequency fan to be the first rotational speed;

[0024] When the target parameter value is the second low-pressure temperature value, controlling and adjusting the rotational speed of the variable-frequency fan to be the second rotational speed;

[0025] When the target parameter value is the third low-pressure temperature value, controlling and adjusting the rotational speed of the variable-frequency fan to be the third rotational speed;

[0026] Wherein, the first rotational speed is greater than the second rotational speed, and the second rotational speed is greater than or equal to the third rotational speed.

[0027] According to an embodiment of the present invention, the step of determining the pressure parameter to be adjusted of the heat pump system according to the current working mode specifically includes:

[0028] If the current working mode is the heating mode, then determine that the pressure parameter to be adjusted of the heat pump system is the high-pressure parameter;

[0029] Wherein, the high-pressure parameter includes high-pressure and / or high-pressure protection temperature.

[0030] According to an embodiment of the present invention, the step of calculating the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature specifically includes:

[0031] When the outdoor ambient temperature is less than the third set temperature, calculating that the target parameter value of the high-pressure protection temperature is the first high-pressure temperature value;

[0032] When the outdoor ambient temperature is greater than or equal to the third set temperature and less than the fourth set temperature, calculating that the target parameter value of the high-pressure protection temperature is the second high-pressure temperature value;

[0033] When the outdoor ambient temperature is greater than or equal to the fourth set temperature, calculating that the target parameter value of the high-pressure protection temperature is the third high-pressure temperature value;

[0034] Wherein, both the second high-pressure temperature value and the third high-pressure temperature value are greater than the first high-pressure temperature value, and the first high-pressure temperature, the second high-pressure temperature, and the third high-pressure temperature are respectively positively correlated with the outdoor ambient temperature.

[0035] According to an embodiment of the present invention, the step of controlling and adjusting the operating parameters of the variable-frequency fan according to the target parameter value so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value specifically includes:

[0036] When the target parameter value is the first high-pressure temperature value, controlling and adjusting the rotational speed of the variable-frequency fan to be the fourth rotational speed;

[0037] When the target parameter value is the second high-pressure temperature value, controlling and adjusting the rotational speed of the variable-frequency fan to be the fifth rotational speed;

[0038] When the target parameter value is the third high-pressure temperature value, controlling and adjusting the rotational speed of the variable-frequency fan to be the sixth rotational speed;

[0039] Wherein, both the fifth rotational speed and the sixth rotational speed are less than the fourth rotational speed.

[0040] A control device for a heat pump system according to an embodiment of the second aspect of the present invention includes:

[0041] An acquisition module, configured to acquire the current operating mode of the heat pump system and the outdoor ambient temperature;

[0042] A first control module, configured to determine the pressure parameter to be adjusted of the heat pump system according to the current operating mode, and calculate the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature;

[0043] A second control module, configured to control and adjust the operating parameters of the variable-frequency fan according to the target parameter value so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value.

[0044] A heat pump system according to an embodiment of the third aspect of the present invention includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the control method of the heat pump system as described in the embodiment of the first aspect of the present invention.

[0045] The present invention provides a control method for a heat pump system. This control method classifies different operating modes of the heat pump system, and combines the outdoor ambient temperature in the current operating mode to specifically calculate the target pressure parameters required by the heat pump system under different operating modes and different parameter conditions, so as to quickly determine the target pressure parameters of the heat pump system in various different situations, and control and adjust the operating parameters of the variable-frequency fan to enable the heat pump system to quickly reach the above target pressure parameters, thereby enabling the heat pump system to quickly reach a balanced state.

[0046] That is, by establishing a relational expression that correlates the outdoor ambient temperature with the target parameter value of the pressure parameter to be adjusted, the present invention can quickly determine the pressure parameter to be adjusted currently required by the heat pump system and its target parameter value. Furthermore, it can quickly bring the system into a balance, greatly reducing the system's self-adjustment time. It can be understood that compared with the passive control method of the fan in the related art, which has a long process duration and complex operations, the control method proposed by the present invention has a shorter duration, simpler operations, and higher accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0048] Figure 1 is one of the flow diagrams of the control method of the heat pump system provided by the present invention;

[0049] Figure 2 is another flow diagram of the control method of the heat pump system provided by the present invention;

[0050] Figure 3 is the structural diagram of the control device of the heat pump system provided by the present invention;

[0051] Figure 4 is the structural diagram of the heat pump system provided by the present invention;

[0052] Figure 5 is the structural diagram of the electronic device provided by the present invention.

[0053] REFERENCE NUMERALS:

[0054] 1, compressor; 2, four-way valve; 3, outdoor heat exchanger; 4, throttling device; 5, water-fluorine heat exchanger; 6, water pump; 110, acquisition module; 120, control module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0056] The control method, control device and heat pump system proposed by the present invention will be described below with reference to the accompanying drawings. Among them, before describing the embodiments of the present invention in detail, the entire application scenario will be described first. The control method, control device, electronic device and computer-readable storage medium of the heat pump system in the embodiments of the present invention can be applied not only to the local heat pump system, but also to the cloud platform in the Internet field, or the cloud platform in other types of Internet fields, or can also be applied to third-party devices. Among them, the third-party devices may include various different types such as mobile phones, tablets, notebooks, in-vehicle computers and other intelligent terminals.

[0057] Below, only the control method applicable to the heat pump system will be used as an example for illustration. It should be understood that the control method in the embodiments of the present invention can also be applied to the cloud platform and third-party devices.

[0058] It should also be noted that the control method of the heat pump system proposed by the present invention is universal, that is, this method is applicable to the heat pump system for refrigeration or heating in a low-temperature environment or a high-temperature environment.

[0059] As Figure 1 shown, the control method of the heat pump system according to the first aspect embodiment of the present invention includes:

[0060] Step S1, obtaining the current working mode of the heat pump system and the outdoor ambient temperature;

[0061] Step S2, determining the pressure parameter to be adjusted of the heat pump system according to the current working mode, and calculating the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature;

[0062] Step S3, controlling and adjusting the working parameters of the variable-frequency fan according to the target parameter value, so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value.

[0063] According to the control method of the heat pump system in the embodiments of the present invention, its specific working process is as follows: First, it is necessary to obtain the current working mode of the heat pump system. Among them, the working mode may include a heating mode, a refrigeration mode, a dehumidification mode, etc. Under different working modes, the operating mode and the required pressure parameters of the heat pump system may be different. Secondly, according to the obtained current working mode, determine the pressure parameter to be adjusted of the heat pump system. Among them, this pressure parameter to be adjusted may include high-pressure pressure, low-pressure pressure, the saturation temperature corresponding to the high-pressure pressure, the saturation temperature corresponding to the low-pressure pressure, etc., specifically depending on the type and working mode of the heat pump system.

[0064] Then, the target parameter value of the pressure parameter to be adjusted is calculated according to the outdoor environmental temperature. It can be understood that the outdoor environmental temperature has a great influence on the operation of the heat pump system, so it is necessary to adjust the pressure parameter according to the actual outdoor environmental temperature. Finally, according to the calculated target parameter value, the operating parameters of the variable-frequency fan are controlled and adjusted so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value. For example, the rotational speed of the variable-frequency fan can be adjusted to make the pressure parameter to be adjusted reach the target parameter value, so that the heat pump system can operate stably and efficiently under various working conditions.

[0065] In the related art, currently, heat pump water heaters usually adopt the control method of the original air-conditioning fluorine machine system. Generally, during heating, the control is carried out according to the target high-pressure pressure or the saturation temperature corresponding to the target high-pressure pressure. However, this kind of control often ignores the influence of the low-pressure pressure or the saturation temperature corresponding to the low-pressure pressure under different ambient temperatures on the system control, and can only passively control the low-pressure pressure or the low-pressure saturation temperature through the fan. This system control process is relatively long, and the time to reach the equilibrium state is also relatively long, resulting in a large amount of energy waste.

[0066] Similarly, during system refrigeration, the control is carried out according to the target low-pressure pressure or the saturation temperature corresponding to the target low-pressure pressure. However, this kind of control often ignores the influence of the high-pressure pressure or the saturation temperature corresponding to the high-pressure pressure under different ambient temperatures on the system control, and can only passively control the high-pressure pressure or the high-pressure saturation temperature through the fan. This system control process is relatively long, and the time to reach the equilibrium state is also relatively long, resulting in a large amount of energy waste.

[0067] In summary, in order to solve the technical defects existing in the above-mentioned related art, the present invention provides a control method for a heat pump system. The control method classifies different working modes of the heat pump system, and combines the outdoor environmental temperature in the current working mode to calculate the target pressure parameters required by the heat pump system under different working modes and different parameter conditions, so as to quickly determine the target pressure parameters of the heat pump system in various different situations, and control and adjust the working parameters of the variable-frequency fan to make the heat pump system quickly reach the above-mentioned target pressure parameters, thereby enabling the heat pump system to quickly reach the equilibrium state.

[0068] That is to say, the present invention can quickly determine the pressure parameter to be adjusted and its target parameter value required by the heat pump system currently by establishing a relational expression associating the outdoor environmental temperature with the target parameter value of the pressure parameter to be adjusted, and then can quickly make the system reach a balance, greatly reducing the system self-adjustment time. It can be understood that compared with the passive control method of the fan with a long process duration and complex operation in the related art, the control method proposed by the present invention has a shorter duration, simpler operation and higher accuracy.

[0069] As can be seen from the above, by means of real-time monitoring and precise regulation of the heat pump system, this method can improve the efficiency of the heat pump system, reduce energy consumption, and extend the service life of the equipment.

[0070] According to some embodiments of the present invention, after the step of obtaining the current operating mode of the heat pump system and the outdoor ambient temperature, the control method of the heat pump system further includes:

[0071] When the heat pump system is in the heating mode, controlling the high-pressure pressure parameter of the heat pump system to reach the set high-pressure pressure parameter value;

[0072] Or, when the heat pump system is in the cooling mode, controlling the low-pressure pressure parameter of the heat pump system to reach the set low-pressure pressure parameter value.

[0073] In this embodiment, when the heat pump system is in the heating mode, controlling the high-pressure pressure parameter to reach the set high-pressure pressure parameter value is to ensure the stable operation and high efficiency of the heat pump system. If the high-pressure pressure parameter is too high or too low, it may cause the heat pump system to malfunction or have low efficiency. Therefore, by controlling the high-pressure pressure parameter, it can be ensured that the heat pump system can provide sufficient heat in the heating mode.

[0074] Similarly, when the heat pump system is in the cooling mode, controlling the low-pressure pressure parameter to reach the set low-pressure pressure parameter value is to ensure the cooling effect of the heat pump system. If the low-pressure pressure parameter is too high or too low, it may affect the cooling capacity of the heat pump system and even cause equipment damage. Therefore, by controlling the low-pressure pressure parameter, it can be ensured that the heat pump system can effectively reduce the temperature in the cooling mode.

[0075] It should be noted that the control of the pressure parameters in the above two cases is achieved by adjusting the operating parameters of the variable-frequency fan. The variable-frequency fan can change the rotation speed according to needs, thereby changing the pressure parameters of the heat pump system. By precisely controlling the operating parameters of the variable-frequency fan, the heat pump system can maintain the best operating state under various working conditions.

[0076] Furthermore, after the step of obtaining the current operating mode of the heat pump system and the outdoor ambient temperature, it further includes: obtaining the target outlet water temperature Tset of the heat pump system. Then, setting the high-pressure pressure parameter value includes setting the high-pressure protection temperature Pd_t, and the high-pressure protection temperature Pd_t = Tset + α (α is a constant); or, setting the low-pressure pressure parameter value includes setting the low-pressure protection temperature Ps_t, and the low-pressure protection temperature Ps_t = Tset - β (β is a constant).

[0077] It can be understood that in the heating mode of the heat pump system, the high-pressure pressure parameter of the compressor (such as high-pressure pressure or high-pressure pressure saturation temperature) is closely related to the heating power of the compressor, and the heating power of the compressor determines the size of the target outlet water temperature. Therefore, when the heat pump system is currently in the heating mode, the high-pressure pressure parameter of the compressor is closely related to the target outlet water temperature set by the system. In this way, by analyzing the target outlet water temperature in the heating mode, this method can accurately obtain the high-pressure pressure parameter adapted to the current target outlet water temperature, that is, the target high-pressure pressure parameter.

[0078] Similarly, in the cooling mode of the heat pump system, the low-pressure pressure parameter of the compressor (such as low-pressure pressure or low-pressure pressure saturation temperature) is closely related to the cooling power of the compressor, and the cooling power of the compressor determines the size of the target outlet water temperature. Therefore, when the heat pump system is currently in the cooling mode, the low-pressure pressure parameter of the compressor is closely related to the target outlet water temperature set by the system. In this way, by analyzing the target outlet water temperature in the cooling mode, this method can accurately obtain the low-pressure pressure parameter adapted to the current target outlet water temperature, that is, the target low-pressure pressure parameter.

[0079] It should be explained that the above α and β are constants, which are generally related to the configuration of the heat pump system and can be determined according to experimental tests for their specific sizes.

[0080] According to some embodiments of the present invention, the step of determining the pressure parameter to be adjusted of the heat pump system according to the current working mode specifically includes:

[0081] If the current working mode is the heating mode, then determine that the pressure parameter to be adjusted of the heat pump system is the low-pressure pressure parameter. Among them, the low-pressure pressure parameter includes low-pressure pressure and / or low-pressure protection temperature.

[0082] In this embodiment, in the heating mode of the heat pump system, the influence of the external environment on the low-pressure pressure parameter of the compressor is relatively large. Therefore, when the heat pump system is currently in the heating mode, the low-pressure pressure parameter of the compressor is closely related to the outdoor ambient temperature. For example, the lower the outdoor ambient temperature, the lower the low-pressure pressure of the heat pump system. In this way, by analyzing the current outdoor ambient temperature of the outdoor environment, this method can accurately obtain the low-pressure pressure parameter adapted to the current outdoor ambient temperature, that is, the target parameter value of the low-pressure pressure parameter.

[0083] In some specific embodiments of the present invention, the step of calculating the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature specifically includes:

[0084] When the outdoor ambient temperature is less than the first set temperature, calculate that the target parameter value of the low-pressure protection temperature is the first low-pressure temperature value;

[0085] When the outdoor ambient temperature is greater than or equal to the first set temperature and less than the second set temperature, the target parameter value of the low-pressure pressure protection temperature is calculated as the second low-pressure temperature value;

[0086] When the outdoor ambient temperature is greater than or equal to the second set temperature, the target parameter value of the low-pressure pressure protection temperature is calculated as the third low-pressure temperature value.

[0087] Among them, the first low-pressure temperature value is greater than the second low-pressure temperature value, the second low-pressure temperature value is greater than or equal to the third low-pressure temperature value, and the first low-pressure temperature value, the second low-pressure temperature value, and the third low-pressure temperature value are respectively positively correlated with the outdoor ambient temperature.

[0088] For example Figure 2 As shown, assuming that the target low-pressure pressure saturation temperature is marked as Ps_t and the outdoor ambient temperature is marked as Tao, the relationship between the target low-pressure pressure saturation temperature Ps_t and the outdoor ambient temperature Tao is as follows:

[0089] When Tao < 0°C, Ps_t = Tao - 3°C;

[0090] When 0 ≤ Tao < 20°C, Ps_t = Tao - 3 - Tao / 10°C;

[0091] When 20 ≤ Tao°C, Ps_t = Tao - 5 - (Tao - 20) / 5°C.

[0092] Furthermore, the steps of controlling and adjusting the operating parameters of the variable-frequency fan according to the target parameter value so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value specifically include:

[0093] When the target parameter value is the first low-pressure temperature value, control and adjust the rotational speed of the variable-frequency fan to the first rotational speed;

[0094] When the target parameter value is the second low-pressure temperature value, control and adjust the rotational speed of the variable-frequency fan to the second rotational speed;

[0095] When the target parameter value is the third low-pressure temperature value, control and adjust the rotational speed of the variable-frequency fan to the third rotational speed.

[0096] Among them, the first rotational speed is greater than the second rotational speed, and the second rotational speed is greater than or equal to the third rotational speed.

[0097] It can be understood that in the heating mode, the saturation temperature Ps_t corresponding to the low-pressure pressure has a close relationship with the external ambient temperature. When the ambient temperature is constant, the higher the rotational speed of the outdoor variable-frequency fan, the greater the saturation temperature Ps_t corresponding to the low-pressure pressure; the lower the rotational speed of the outdoor variable-frequency fan, the smaller the saturation temperature Ps_t corresponding to the low-pressure pressure.

[0098] Therefore, in order to enable the low-pressure pressure saturation temperature of the heat pump system to reach the above different target parameter values at different outdoor ambient temperatures, in this embodiment, the rotational speeds of the variable-frequency fans are respectively adjusted to the first rotational speed, the second rotational speed, and the third rotational speed to respectively correspond to the above first low-pressure temperature value, the second low-pressure temperature value, and the third low-pressure temperature value. And since the first low-pressure temperature value is greater than the second low-pressure temperature value, and the second low-pressure temperature value is greater than or equal to the third low-pressure temperature value, the magnitude relationship of the rotational speeds is as follows: the first rotational speed is greater than the second rotational speed, and the second rotational speed is greater than or equal to the third rotational speed.

[0099] According to some other embodiments of the present invention, the step of determining the pressure parameter to be adjusted of the heat pump system according to the current working mode specifically includes:

[0100] If the current working mode is the heating mode, then it is determined that the pressure parameter to be adjusted of the heat pump system is the high-pressure pressure parameter. Wherein, the high-pressure pressure parameter includes the high-pressure pressure and / or the high-pressure pressure protection temperature.

[0101] It can be understood that in the refrigeration mode of the heat pump system, the influence of the external environment on the high-pressure pressure parameter of the compressor is relatively large. Therefore, when the heat pump system is currently in the refrigeration mode, the high-pressure pressure parameter of the compressor is closely related to the outdoor ambient temperature. For example, the higher the outdoor ambient temperature, the greater the high-pressure pressure of the heat pump system. In this way, by analyzing the current outdoor ambient temperature of the external environment, this method can accurately obtain the high-pressure pressure parameter adapted to the current outdoor ambient temperature, that is, the target parameter value of the high-pressure pressure parameter.

[0102] In some specific embodiments of the present invention, the step of calculating the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature specifically includes:

[0103] When the outdoor ambient temperature is less than the third set temperature, the calculated target parameter value of the high-pressure pressure protection temperature is the first high-pressure temperature value;

[0104] When the outdoor ambient temperature is greater than or equal to the third set temperature and less than the fourth set temperature, the calculated target parameter value of the high-pressure pressure protection temperature is the second high-pressure temperature value;

[0105] When the outdoor ambient temperature is greater than or equal to the fourth set temperature, the calculated target parameter value of the high-pressure pressure protection temperature is the third high-pressure temperature value.

[0106] Wherein, both the second high-pressure temperature value and the third high-pressure temperature value are greater than the first high-pressure temperature value, and the first high-pressure temperature, the second high-pressure temperature, and the third high-pressure temperature are respectively positively correlated with the outdoor ambient temperature.

[0107] For example Figure 2As shown in the figure, assuming that the target high-pressure pressure saturation temperature is marked as Pd_t and the outdoor ambient temperature is marked as Tao, the relationship between the target high-pressure pressure saturation temperature Pd_t and the outdoor ambient temperature Tao is as follows:

[0108] When Tao < 10°C, Pd_t = Tao + 10°C;

[0109] When 10 ≤ Tao < 35°C, Pd_t = Tao + 10 + (Tao - 10) / 10°C;

[0110] When 35 ≤ Tao °C, Pd_t = Tao + 10 + (Tao - 35) / 5°C.

[0111] Furthermore, the steps of controlling and adjusting the operating parameters of the variable-frequency fan according to the target parameter value so that the pressure parameter to be adjusted in the heat pump system reaches the target parameter value specifically include:

[0112] When the target parameter value is the first high-pressure temperature value, control and adjust the rotational speed of the variable-frequency fan to the fourth rotational speed;

[0113] When the target parameter value is the second high-pressure temperature value, control and adjust the rotational speed of the variable-frequency fan to the fifth rotational speed;

[0114] When the target parameter value is the third high-pressure temperature value, control and adjust the rotational speed of the variable-frequency fan to the sixth rotational speed.

[0115] Among them, both the fifth rotational speed and the sixth rotational speed are less than the fourth rotational speed.

[0116] It can be understood that in the refrigeration mode, the saturation temperature Pd_t corresponding to the high-pressure pressure has a close relationship with the external ambient temperature. When the ambient temperature is constant, the higher the rotational speed of the outdoor variable-frequency fan, the smaller the saturation temperature Pd_t corresponding to the high-pressure pressure; the lower the rotational speed of the outdoor variable-frequency fan, the larger the saturation temperature Pd_t corresponding to the high-pressure pressure.

[0117] Therefore, in order to enable the high-pressure pressure saturation temperature of the heat pump system under different outdoor ambient temperatures to reach the above different target parameter values, in this embodiment, the rotational speed of the variable-frequency fan is respectively adjusted to the fourth rotational speed, the fifth rotational speed, and the sixth rotational speed to respectively correspond to the above first high-pressure temperature value, the second high-pressure temperature value, and the third high-pressure temperature value. And since both the second high-pressure temperature value and the third high-pressure temperature value are greater than the first high-pressure temperature value, the magnitude relationship of the rotational speeds is as follows: both the fifth rotational speed and the sixth rotational speed are less than the fourth rotational speed.

[0118] It should be noted that although the above embodiment uses the saturation temperatures corresponding to the high and low pressures for target setting, the control method of the present invention can also use other temperatures such as the water outlet temperature of the unit or directly use the high and low pressures for setting, and the solution effect of the present invention can be achieved.

[0119] In addition, in the above embodiments, the relationship between the heating Ps_t / refrigeration Pd_t and Tao only serves as an example and does not constitute a specific limitation. There may also be other forms of relationship between the above heating Ps_t / refrigeration Pd_t and Tao. Further, all those that achieve the object of the present invention by using high and low pressure control, or outlet water temperature, or suction and discharge control, etc. fall within the protection scope of the present invention.

[0120] The control device of the heat pump system provided by the present invention will be described below. The control device of the heat pump system described below can be correspondingly referred to the control method of the heat pump system described above.

[0121] As Figure 3 shown, the control device of the heat pump system according to the second aspect embodiment of the present invention includes:

[0122] An acquisition module 110, configured to acquire the current working mode of the heat pump system and the outdoor ambient temperature;

[0123] A first control module 120, configured to determine the pressure parameter to be adjusted of the heat pump system according to the current working mode, and calculate the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature;

[0124] A second control module 130, configured to control and adjust the working parameters of the variable-frequency fan according to the target parameter value, so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value.

[0125] As Figure 4 shown, the heat pump system according to the third aspect embodiment of the present invention includes a compressor 1, a four-way valve 2, a throttling device 4, a water-fluorine heat exchanger 5, a water pump 6 and an outdoor heat exchanger 3, and further includes the control device of the heat pump system described in the second aspect embodiment of the present invention.

[0126] Wherein, in the heat pump system, a complete heating cycle is that the refrigerant flows from the compressor 1 through the four-way valve 2 to the water-fluorine heat exchanger 5, then enters the outdoor heat exchanger 3 through the throttling device 4, and then flows through the four-way valve 2 to the compressor 1, thus completing a complete heating cycle.

[0127] A complete refrigeration cycle is that the refrigerant flows from the compressor 1 through the four-way valve 2 to the outdoor heat exchanger 3, then passes through the throttling device 4 and enters the water-fluorine heat exchanger 5, and then flows through the four-way valve 2 to the compressor 1, thus completing a complete refrigeration cycle.

[0128] According to the control device and the heat pump system of the embodiments of the present invention, through real-time monitoring and precise adjustment of the heat pump system, the efficiency of the heat pump system can be improved, energy consumption can be reduced, and the service life of the equipment can be extended.

[0129] Figure 5 Schematically illustrates the physical structure of an electronic device, as Figure 5 shown. The electronic device may include: a processor 810, a communications interface 820, a memory 830, and a communication bus 840. Among them, the processor 810, the communications interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 can call the logical instructions in the memory 830 to execute the control method of the heat pump system, including: obtaining the current working mode of the heat pump system and the outdoor ambient temperature; determining the pressure parameter to be adjusted of the heat pump system according to the current working mode, and calculating the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature; controlling and adjusting the working parameters of the variable-frequency fan according to the target parameter value so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value.

[0130] In addition, when the logical instructions in the above-mentioned memory 830 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0131] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the heat pump system provided by the above-mentioned various methods, including: obtaining the current working mode of the heat pump system and the outdoor ambient temperature; determining the pressure parameter to be adjusted of the heat pump system according to the current working mode, and calculating the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature; controlling and adjusting the working parameters of the variable-frequency fan according to the target parameter value so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value.

[0132] In another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the control method of the heat pump system provided by the above-mentioned various methods, including: obtaining the current working mode of the heat pump system and the outdoor ambient temperature; determining the pressure parameter to be adjusted of the heat pump system according to the current working mode, and calculating the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature; controlling and adjusting the working parameters of the variable-frequency fan according to the target parameter value, so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value.

[0133] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0134] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiments.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims

1. A control method for a heat pump system, characterized in that, Including: Obtaining the current operating mode of the heat pump system and the outdoor ambient temperature; Determining the pressure parameter to be adjusted of the heat pump system according to the current operating mode, and calculating the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature; Controlling and adjusting the operating parameters of the variable-frequency fan according to the target parameter value, so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value.

2. The control method of the heat pump system according to claim 1, wherein After the step of obtaining the current operating mode of the heat pump system and the outdoor ambient temperature, it further includes: When the heat pump system is in the heating mode, controlling the high-pressure pressure parameter of the heat pump system to reach the set high-pressure pressure parameter value; Or, when the heat pump system is in the cooling mode, controlling the low-pressure pressure parameter of the heat pump system to reach the set low-pressure pressure parameter value.

3. The control method of the heat pump system according to claim 2, characterized in that, After the step of obtaining the current operating mode of the heat pump system and the outdoor ambient temperature, it further includes: obtaining the target outlet water temperature Tset of the heat pump system; Then the set high-pressure pressure parameter value includes setting a high-pressure pressure protection temperature Pd_t, and the set high-pressure pressure protection temperature Pd_t = Tset + α (α is a constant); or, the set low-pressure pressure parameter value includes setting a low-pressure pressure protection temperature Ps_t, and the set low-pressure pressure protection temperature Ps_t = Tset - β (β is a constant).

4. The control method of the heat pump system according to claim 3, characterized in that, The step of determining the pressure parameter to be adjusted of the heat pump system according to the current operating mode specifically includes: If the current operating mode is the heating mode, determining that the pressure parameter to be adjusted of the heat pump system is the low-pressure pressure parameter; Wherein, the low-pressure pressure parameter includes the low-pressure pressure and / or the low-pressure pressure protection temperature.

5. The control method of the heat pump system according to claim 4, characterized in that, The step of calculating the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature specifically includes: When the outdoor ambient temperature is less than the first set temperature, calculating that the target parameter value of the low-pressure pressure protection temperature is the first low-pressure temperature value; When the outdoor ambient temperature is greater than or equal to the first set temperature and less than the second set temperature, calculating that the target parameter value of the low-pressure pressure protection temperature is the second low-pressure temperature value; When the outdoor ambient temperature is greater than or equal to the second set temperature, calculating that the target parameter value of the low-pressure pressure protection temperature is the third low-pressure temperature value; Wherein, the first low-pressure temperature value is greater than the second low-pressure temperature value, the second low-pressure temperature value is greater than or equal to the third low-pressure temperature value, and the first low-pressure temperature value, the second low-pressure temperature value and the third low-pressure temperature value are respectively positively correlated with the outdoor ambient temperature.

6. The control method of the heat pump system according to claim 5, characterized in that, The step of controlling and adjusting the operating parameters of the variable-frequency fan according to the target parameter value, so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value specifically includes: When the target parameter value is the first low-pressure temperature value, controlling and adjusting the rotational speed of the variable-frequency fan to be the first rotational speed; When the target parameter value is the second low-pressure temperature value, controlling and adjusting the rotational speed of the variable-frequency fan to be the second rotational speed; When the target parameter value is the third low-pressure temperature value, control and adjust the rotational speed of the variable-frequency fan to the third rotational speed; Wherein, the first rotational speed is greater than the second rotational speed, and the second rotational speed is greater than or equal to the third rotational speed.

7. The control method of the heat pump system according to any one of claims 3 to 6, characterized in that The step of determining the pressure parameter to be adjusted of the heat pump system according to the current working mode specifically includes: If the current working mode is the heating mode, determine that the pressure parameter to be adjusted of the heat pump system is the high-pressure parameter; Wherein, the high-pressure parameter includes high-pressure and / or high-pressure protection temperature.

8. The control method of the heat pump system according to claim 7, wherein The step of calculating the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature specifically includes: When the outdoor ambient temperature is less than the third set temperature, calculate that the target parameter value of the high-pressure protection temperature is the first high-pressure temperature value; When the outdoor ambient temperature is greater than or equal to the third set temperature and less than the fourth set temperature, calculate that the target parameter value of the high-pressure protection temperature is the second high-pressure temperature value; When the outdoor ambient temperature is greater than or equal to the fourth set temperature, calculate that the target parameter value of the high-pressure protection temperature is the third high-pressure temperature value; Wherein, both the second high-pressure temperature value and the third high-pressure temperature value are greater than the first high-pressure temperature value, and the first high-pressure temperature, the second high-pressure temperature, and the third high-pressure temperature are respectively positively correlated with the outdoor ambient temperature.

9. The control method of the heat pump system according to claim 8, characterized in that, The step of controlling and adjusting the working parameters of the variable-frequency fan according to the target parameter value so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value specifically includes: When the target parameter value is the first high-pressure temperature value, control and adjust the rotational speed of the variable-frequency fan to the fourth rotational speed; When the target parameter value is the second high-pressure temperature value, control and adjust the rotational speed of the variable-frequency fan to the fifth rotational speed; When the target parameter value is the third high-pressure temperature value, control and adjust the rotational speed of the variable-frequency fan to the sixth rotational speed; Wherein, both the fifth rotational speed and the sixth rotational speed are less than the fourth rotational speed.

10. A control device for a heat pump system, characterized in that, Comprising: An acquisition module, configured to acquire the current working mode and the outdoor ambient temperature of the heat pump system; A first control module, configured to determine the pressure parameter to be adjusted of the heat pump system according to the current working mode, and calculate the target parameter value of the pressure parameter to be adjusted according to the outdoor ambient temperature; A second control module, configured to control and adjust the working parameters of the variable-frequency fan according to the target parameter value so that the pressure parameter to be adjusted of the heat pump system reaches the target parameter value.

11. A heat pump system, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the control method of the heat pump system according to any one of claims 1 to 9.

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