A variable-frequency air source heat pump pool machine system

Abstract

The present invention discloses a variable-frequency air-source heat pump pool machine system, including a variable-frequency air-source heat pump pool unit and a control system of the variable-frequency air-source heat pump pool unit. Among them, the variable-frequency air-source heat pump pool unit includes a compressor, a four-way reversing valve, a gas-liquid separator, an evaporator, an electronic expansion valve, a dryer filter, and a water-side heat exchanger; the control system is used to obtain a first relationship based on the suction temperature and the evaporation temperature, and a second relationship based on the discharge temperature and the water tank temperature by collecting the discharge temperature of the compressor, the suction temperature of the compressor, the evaporation temperature of the evaporator, the ambient dry-bulb temperature of the evaporator, and the water tank temperature of the water-side heat exchanger, and control the variable-frequency air-source heat pump pool unit according to the first relationship and the second relationship; using two sets of data of water temperature and ambient temperature as judgment conditions, controlling the compressor frequency and the fan stop interval time during the switching of the four-way reversing valve to ensure the effective switching of the four-way reversing valve and effectively ensure the efficiency of defrosting.

Description

Technical Field

[0001] This application relates to the technical field of intelligent control of air - source variable - frequency heat pump pool machines, and more specifically, to a variable - frequency air - source heat pump pool machine system. Background Art

[0002] With the improvement of living standards, people's requirements for living comfort are also getting higher and higher. In developed countries, swimming and private swimming pools have become an important indicator to measure the quality of life. Almost every household has a swimming pool, water exercise equipment, etc. Therefore, air - source pool heat pump water heaters have many advantages such as safety and energy conservation, and air - source pool machine heat pumps are widely accepted and have become an essential basic facility in life;

[0003] Currently, the popular air - source variable - frequency heat pump pool machine system mainly defrosts by switching the four - way valve. During the switching process, some manufacturers set the compressor to switch at a low frequency, while some manufacturers stop the compressor for switching. At the same time, the fan only simply stops, and it is unable to effectively maintain the pressure range value for the four - way reversing valve to reverse, especially in the case of low ambient temperature and low water temperature, it is difficult to ensure the successful reversal of the four - way reversing valve;

[0004] When the currently popular air - source variable - frequency heat pump pool machine system defrosts by switching the four - way valve, the main - path electronic expansion valve and other throttling components have a fixed opening degree, and they are unable to effectively make intelligent actions according to conditions such as water temperature, ambient temperature, defrosting compressor superheat, and defrosting rate, resulting in low defrosting efficiency;

[0005] When the currently popular air - source variable - frequency heat pump pool machine system defrosts by switching the four - way valve, the unit does not have an electronic expansion valve defrost bypass device, and does not monitor the defrost time and compressor superheat, resulting in too long defrost time, affecting the life of the compressor and the user experience. Summary of the Invention

[0006] The purpose of the present invention is to provide a control technology for variable - frequency air - source heat pump pool machines, which can ensure that the air - source variable - frequency heat pump pool machine effectively switches the four - way reversing valve at low temperatures, effectively shortens the defrost time, increases the heating capacity at low temperatures, and increases the COP value.

[0007] To achieve the above - mentioned purpose, the present invention provides a variable - frequency air - source heat pump pool machine system, including:

[0008] A variable - frequency air - source heat pump pool machine unit and a control system of the variable - frequency air - source heat pump pool machine unit,

[0009] Wherein,

[0010] The variable - frequency air - source heat pump pool machine unit includes a compressor, a four - way reversing valve, a gas - liquid separator, an evaporator, an electronic expansion valve, a drying filter, and a water - side heat exchanger;

[0011] The compressor is respectively connected to a four-way reversing valve and a gas-liquid separator;

[0012] The four-way reversing valve is respectively connected to the compressor, the evaporator, the water-side heat exchanger, and the gas-liquid separator;

[0013] The evaporator is connected to the drying filter through an electronic expansion valve;

[0014] The drying filter is connected to the water-side heat exchanger;

[0015] The control system is used to obtain a first relationship based on the suction temperature and the evaporation temperature by collecting the exhaust temperature of the compressor, the suction temperature of the compressor, the evaporation temperature of the evaporator, the ambient dry-bulb temperature of the evaporator, and the water tank temperature of the water-side heat exchanger,

[0016] and,

[0017] a second relationship based on the exhaust temperature and the water tank temperature,

[0018] and control the variable-frequency air-source heat pump pool unit according to the first relationship and the second relationship.

[0019] Preferably, the four-way reversing valve includes a first air inlet, a second air inlet, a first air outlet, and a second air outlet;

[0020] The first air inlet is connected to the compressor;

[0021] The second air inlet is connected to the evaporator;

[0022] The first air outlet is connected to the water-side heat exchanger;

[0023] The second air outlet is connected to the gas-liquid separator.

[0024] Preferably, the electronic expansion valve includes a main electronic expansion valve and a bypass electronic expansion valve;

[0025] The main electronic expansion valve and the bypass electronic expansion valve are connected in parallel;

[0026] The evaporator is respectively connected to the drying filter through the main electronic expansion valve and the bypass electronic expansion valve.

[0027] Preferably, the control system includes,

[0028] a data acquisition module for collecting the exhaust temperature, the suction temperature, the evaporation temperature, the ambient dry-bulb temperature, and the water tank temperature;

[0029] a data processing module for obtaining the first relationship and the second relationship based on the temperature data obtained by the data acquisition module, and obtaining a control instruction according to the first relationship and the second relationship;

[0030] ​

[0031] A control module, configured to control a variable-frequency air-source heat pump pool unit to perform defrosting work according to a control instruction;

[0032] A data storage module, configured to store data generated by the control system;

[0033] A display module, configured to display the exhaust temperature, the suction temperature, the evaporation temperature, the ambient dry-bulb temperature, the water tank temperature, and the progress of the defrosting work.

[0034] Preferably, the compressor is a variable-frequency compressor;

[0035] The compressor operating frequencies of the variable-frequency compressor include a first frequency, a second frequency, a third frequency, and a fourth frequency, where the first frequency is greater than the second frequency, the second frequency is greater than the third frequency, and the third frequency is greater than the fourth frequency;

[0036] The first opening platform values of the main electronic expansion valve include a first opening, a second opening, a third opening, and a fourth opening, where the first opening is greater than the second opening, the second opening is greater than the third opening, and the third opening is greater than the fourth opening;

[0037] The second opening platform values of the bypass electronic expansion valve include a fifth opening, a sixth opening, a seventh opening, and an eighth opening, where the fifth opening is greater than the sixth opening, the sixth opening is greater than the seventh opening, and the seventh opening is greater than the eighth opening.

[0038] Preferably, the control system is further configured to adjust the first opening platform value and the second opening platform value according to the exhaust temperature and a first relationship, where the greater the exhaust temperature and the first relationship, the greater the first opening platform value and the second opening platform value.

[0039] Preferably, the control system is further configured to collect the ambient temperature and the water temperature of the pool, and under the condition of keeping the water temperature unchanged, the control system performs defrosting work by adjusting the compressor frequency, the motor stop time, and the time difference of the switching action of the four-way reversing valve,

[0040] where,

[0041] When the ambient temperature and the water temperature are in low-temperature conditions, the compressor frequency is adjusted to the first frequency, the motor stop time is shortened to the first stop time, and the time difference of the switching action of the four-way reversing valve is shortened to the first time difference;

[0042] When the ambient temperature is in low-temperature conditions and the water temperature is in high-temperature conditions, the compressor frequency is adjusted to the second frequency, the motor stop time is shortened to the second stop time, and the time difference of the switching action of the four-way reversing valve is shortened to the second time difference, where the second stop time is greater than the first stop time and the second time difference is greater than the first time difference;

[0043] When the ambient temperature is at a relatively high temperature condition and the water temperature is at a low temperature condition, the compressor frequency is adjusted to the third frequency, the motor stop time is extended to the third stop time, and the switching action time difference of the four-way reversing valve is extended to the third time difference. Among them, the third stop time is greater than the second stop time, and the third time difference is greater than the second time difference;

[0044] When the ambient temperature is at a relatively high temperature condition and the water temperature is at a relatively high temperature condition, the compressor frequency is adjusted to the fourth frequency, the motor stop time is extended to the fourth stop time, and the switching action time difference of the four-way reversing valve is extended to the fourth time difference. Among them, the fourth stop time is greater than the third stop time, and the fourth time difference is greater than the third time difference.

[0045] Preferably, the control system is also used to keep the water temperature unchanged,

[0046] When the compressor frequency is increased, the first opening platform value is increased, and at the same time, the second opening platform value is decreased;

[0047] When the compressor frequency is decreased, the first opening platform value is decreased, and at the same time, the second opening platform value is increased.

[0048] Preferably, the control system is also used to adjust the second opening platform value of the bypass electronic expansion valve according to the exhaust temperature and the second relationship. Among them, the greater the exhaust temperature and the second relationship, the greater the second opening platform value.

[0049] Preferably, the ambient temperature includes a first temperature range, a second temperature range, a third temperature range, a fourth temperature range, and a fifth temperature range;

[0050] The first temperature range includes 5 - 15 °C;

[0051] The second temperature range includes -5 - 5 °C;

[0052] The third temperature range includes -15 - -5 °C;

[0053] The fourth temperature range includes -35 - -15 °C.

[0054] The present invention discloses the following technical effects:

[0055] The present invention uses two sets of data of water temperature and ambient temperature as judgment conditions to control the compressor frequency and the fan stop interval time during the switching of the four-way reversing valve, ensuring the effective switching of the four-way reversing valve and effectively ensuring the efficiency of defrosting;

[0056] Using the water temperature, ambient temperature, defrosting compressor superheat degree, and defrosting rate as judgment conditions to control the opening of the defrosting main path throttling component, ensuring a relatively high exhaust superheat degree of the compressor during defrosting and a relatively high heat production for defrosting;

[0057] Control the operation opening degree of the bypass throttling component according to the compressor discharge superheat and the compressor suction superheat to accelerate the defrosting rate;

[0058] Judge the length of the last defrost and the rate of the evaporator temperature rise as the judgment conditions, and intelligently adjust each parameter to ensure a relatively high compressor discharge superheat and compressor suction superheat during defrosting, so as to make the defrosting time shorter and the compressor better protected. Brief Description of the Drawings

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only 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.

[0060] Figure 1 It is the system structure diagram of the present invention;

[0061] Figure 2 It is the system structure diagram of the embodiment of the present invention;

[0062] Figure 3 It is the intelligent control flow chart of the system under the defrosting condition of the embodiment of the present invention;

[0063] Figure 4 It is the refrigerant flow diagram when the present invention normally produces pool hot water in the embodiment;

[0064] Figure 5 It is the refrigerant flow diagram when the defrosting condition is satisfied in the embodiment of the present invention. Detailed Embodiments

[0065] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some, rather than all, embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application that is required to be protected, but only represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0066] As Figures 1-5 shown, the present invention provides a variable-frequency air-source heat pump pool machine system, including:

[0067] Variable-frequency air source heat pump pool unit and control system thereof

[0068] Among them,

[0069] The variable-frequency air source heat pump pool unit includes a compressor, a four-way reversing valve, a gas-liquid separator, an evaporator, an electronic expansion valve, a dryer filter, and a water-side heat exchanger;

[0070] The compressor is respectively connected to the four-way reversing valve and the gas-liquid separator;

[0071] The four-way reversing valve is respectively connected to the compressor, the evaporator, the water-side heat exchanger, and the gas-liquid separator;

[0072] The evaporator is connected to the dryer filter through the electronic expansion valve;

[0073] The dryer filter is connected to the water-side heat exchanger;

[0074] The control system is used to obtain the first relationship based on the suction temperature and the evaporation temperature by collecting the exhaust temperature of the compressor, the suction temperature of the compressor, the evaporation temperature of the evaporator, the ambient dry-bulb temperature of the evaporator, and the water tank temperature of the water-side heat exchanger,

[0075] And,

[0076] The second relationship based on the exhaust temperature and the water tank temperature,

[0077] And according to the first relationship and the second relationship,

[0078] Control the variable-frequency air source heat pump pool unit.

[0079] Furthermore, the four-way reversing valve includes a first air inlet, a second air inlet, a first air outlet, and a second air outlet;

[0080] The first air inlet is connected to the compressor;

[0081] The second air inlet is connected to the evaporator;

[0082] The first air outlet is connected to the water-side heat exchanger;

[0083] The second air outlet is connected to the gas-liquid separator.

[0084] Furthermore, the electronic expansion valve includes a main electronic expansion valve and a bypass electronic expansion valve;

[0085] The main electronic expansion valve and the bypass electronic expansion valve are connected in parallel;

[0086] The evaporator is respectively connected to the dryer filter through the main electronic expansion valve and the bypass electronic expansion valve.

[0087] Furthermore, the control system includes

[0088] a data acquisition module for acquiring the exhaust temperature, suction temperature, evaporation temperature, ambient dry-bulb temperature, and water tank temperature;

[0089] a data processing module for obtaining a first relationship and a second relationship based on the temperature data obtained by the data acquisition module, and obtaining a control instruction based on the first relationship and the second relationship;

[0090] a control module for controlling the variable-frequency air-source heat pump pool unit to perform defrosting work according to the control instruction;

[0091] a data storage module for storing the data generated by the control system;

[0092] a display module for displaying the exhaust temperature, suction temperature, evaporation temperature, ambient dry-bulb temperature, water tank temperature, and the progress of the defrosting work.

[0093] Furthermore, the compressor is a variable-frequency compressor;

[0094] The compressor operating frequencies of the variable-frequency compressor include a first frequency, a second frequency, a third frequency, and a fourth frequency, where the first frequency is greater than the second frequency, the second frequency is greater than the third frequency, and the third frequency is greater than the fourth frequency;

[0095] The first opening platform values of the main electronic expansion valve include a first opening, a second opening, a third opening, and a fourth opening, where the first opening is greater than the second opening, the second opening is greater than the third opening, and the third opening is greater than the fourth opening;

[0096] The second opening platform values of the bypass electronic expansion valve include a fifth opening, a sixth opening, a seventh opening, and an eighth opening, where the fifth opening is greater than the sixth opening, the sixth opening is greater than the seventh opening, and the seventh opening is greater than the eighth opening.

[0097] Furthermore, the control system is also used to adjust the first opening platform value and the second opening platform value according to the exhaust temperature and the first relationship, where the greater the exhaust temperature and the first relationship, the greater the first opening platform value and the second opening platform value.

[0098] Furthermore, the control system is also used to collect the ambient temperature and the water temperature of the pool, and under the condition of keeping the water temperature unchanged, by adjusting the compressor frequency, the motor stop time, and the time difference of the switching action of the four-way reversing valve, the control system performs defrosting work,

[0099] where

[0100] When the ambient temperature and the water temperature are under low temperature conditions, the compressor frequency is adjusted to the first frequency, the motor stop time is shortened to the first stop time, and the switching action time difference of the four-way reversing valve is shortened to the first time difference;

[0101] When the ambient temperature is under low temperature conditions and the water temperature is under high temperature conditions, the compressor frequency is adjusted to the second frequency, the motor stop time is shortened to the second stop time, and the switching action time difference of the four-way reversing valve is shortened to the second time difference, where the second stop time is greater than the first stop time and the second time difference is greater than the first time difference;

[0102] When the ambient temperature is under relatively high temperature conditions and the water temperature is under low temperature conditions, the compressor frequency is adjusted to the third frequency, the motor stop time is lengthened to the third stop time, and the switching action time difference of the four-way reversing valve is lengthened to the third time difference, where the third stop time is greater than the second stop time and the third time difference is greater than the second time difference;

[0103] When the ambient temperature is under relatively high temperature conditions and the water temperature is under relatively high temperature conditions, the compressor frequency is adjusted to the fourth frequency, the motor stop time is lengthened to the fourth stop time, and the switching action time difference of the four-way reversing valve is lengthened to the fourth time difference, where the fourth stop time is greater than the third stop time and the fourth time difference is greater than the third time difference.

[0104] Furthermore, the control system is also used to keep the water temperature unchanged,

[0105] When the compressor frequency is increased, the first opening platform value is increased while the second opening platform value is decreased;

[0106] When the compressor frequency is decreased, the first opening platform value is decreased while the second opening platform value is increased.

[0107] Furthermore, the control system is also used to adjust the second opening platform value of the bypass electronic expansion valve according to the exhaust temperature and the second relationship, where the greater the exhaust temperature and the second relationship, the greater the second opening platform value.

[0108] Furthermore, the ambient temperature includes a first temperature range, a second temperature range, a third temperature range, a fourth temperature range, and a fifth temperature range;

[0109] The first temperature range includes 5 - 15 °C;

[0110] The second temperature range includes -5 - 5 °C;

[0111] The third temperature range includes -15 - -5 °C;

[0112] The fourth temperature range includes -35 - -15 °C.

[0113] Embodiment 1: This invention patent is a control technology for a variable-frequency air-source heat pump pool machine. This patent enables the air-source variable-frequency heat pump pool machine to effectively switch the four-way reversing valve at low temperatures, effectively shorten the defrosting time, increase the heating capacity at low temperatures, and increase the COP value;

[0114] To achieve the above objectives, this invention patent has adopted the following technical solutions:

[0115] Figure 2 (In the variable-frequency air-source heat pump pool machine system): When the system needs to switch the four-way reversing valve for defrosting, it is necessary to simultaneously detect the temperatures of T1, T2, T3, T4, and T5. In addition, two sets of temperature differences need to be satisfied, namely, △T1 = T2 - T3; △T2 = T1 - T5;

[0116] The last defrosting time of the unit, TIME1;

[0117] In this variable-frequency air-source heat pump pool machine system, when normally producing pool hot water, the refrigerant flow direction is as Figure 4 shown;

[0118] In this variable-frequency air-source heat pump pool machine system, when the defrosting conditions are met, the refrigerant flow direction is as Figure 5 shown;

[0119] In this variable-frequency air-source heat pump pool machine system, when the defrosting conditions are met, for Figure 2 The parameter descriptions are as follows:

[0120] Time difference A1: The time difference between when the variable-frequency compressor reduces its frequency to the P1 / P2 / P3 / P4 platform value and the motor stops before entering defrosting;

[0121] Time difference A2: The time difference between when the variable-frequency compressor reduces its frequency to the P1 / P2 / P3 / P4 platform value and the four-way reversing valve changes direction before entering defrosting;

[0122] Time difference A3: The time difference between when the variable-frequency compressor reduces its frequency to the P1 / P2 / P3 / P4 platform value and the electronic expansion valve finishes acting to the K1 / K2 / K3 / K4 platform value before entering defrosting;

[0123] P1 - P4 are the platform values of the compressor operating frequencies, where P1 > P2 > P3 > P4;

[0124] K1 - K4 are the platform values of the opening degrees of the main electronic expansion valve 1, where K1 > K2 > K3 > K4;

[0125] L1 - L4 are the platform values of the opening degrees of the bypass electronic expansion valve 2, where L1 > L2 > L3 > L4;

[0126] When the defrosting condition is met, the control logic is as follows. According to the ambient temperature and water temperature, the compressor frequency during the switching of the four-way reversing valve and the fan stop interval time are controlled, so as to effectively control the evaporator pressure balance value and ensure that there is enough pressure difference to drive the four-way reversing valve to reverse. The control principle is as follows:

[0127] Condition 1: In the case of low ambient temperature and low water temperature, the compressor frequency P value needs to be increased, the motor stop time difference A1 value needs to be shortened, and the four-way reversing valve switching action time difference A2 value needs to be shortened;

[0128] Condition 2: In the case of low ambient temperature and high water temperature, the compressor frequency P value needs to be increased, the motor stop time difference A1 value needs to be shortened, and the four-way reversing valve switching action time difference A2 value needs to be shortened; among them, P is lower than that in Condition 1, and the A1 and A2 values are higher than those in Condition 1;

[0129] Condition 3: In the case of relatively high ambient temperature and low water temperature, the compressor frequency P value needs to be decreased, the motor stop time difference A1 value needs to be lengthened, and the four-way reversing valve switching action time difference A2 value needs to be lengthened; among them, P is lower than that in Condition 2, and the A1 and A2 values are higher than those in Condition 2;

[0130] Condition 4: In the case of relatively high ambient temperature and high water temperature, the compressor frequency P value needs to be decreased, the motor stop time difference A1 value needs to be lengthened, and the four-way reversing valve switching action time difference A2 value needs to be lengthened; among them, P is lower than that in Condition 3, and the A1 and A2 values are higher than those in Condition 3;

[0131] The main electronic expansion valve 1 and the bypass electronic expansion valve 2 adjust the opening according to the exhaust gas temperature T1 value and the temperature difference value △T1. The design principle is that the larger T1 and the difference △T1 are, the larger the opening of the main electronic expansion valve 1 and the bypass electronic expansion valve 2 is;

[0132] For the above content, in the case of the same water temperature, the table parameter values are described in Table 1:

[0133] Table 1

[0134]

[0135] For the above content, in the case of the same water temperature, the control trend values are described in Table 2: (The arrow direction is the direction of increasing value)

[0136] Table 2

[0137]

[0138] For the above content, when the water temperature value rises compared with Table 2, the compressor frequency value is adjusted downward relative to Table 2, the A1\A2\A3 values are adjusted upward relative to Table 2; the k value is adjusted downward relative to Table 2;

[0139] For the above content, when the water temperature value drops compared to Table 2, the compressor frequency value increases relative to Table 2, and the values of A1, A2, and A3 decrease relative to Table 2; the k value increases relative to Table 2.

[0140] For the above content, in the case of the same water temperature, the value of the bypass electronic expansion valve L is adjusted accordingly according to the compressor discharge temperature T1 and the temperature difference value △T2. When it is checked that the values of T1 and △T2 are larger than those during the defrosting period of the previous cycle, the value of L increases, and vice versa.

[0141] It should be noted that: Similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0142] Finally, it should be noted that: The above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. 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: Any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or make equivalent replacements for some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. All should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims

1. A variable-frequency air-source heat pump pool machine system, characterized in that, Comprising: A variable-frequency air-source heat pump pool unit and a control system of the variable-frequency air-source heat pump pool unit, wherein, the variable-frequency air-source heat pump pool unit includes a compressor, a four-way reversing valve, a gas-liquid separator, an evaporator, an electronic expansion valve, a dryer filter, and a water-side heat exchanger; the compressor is respectively connected to the four-way reversing valve and the gas-liquid separator; the four-way reversing valve is respectively connected to the compressor, the evaporator, the water-side heat exchanger, and the gas-liquid separator; the evaporator is connected to the dryer filter through the electronic expansion valve; the dryer filter is connected to the water-side heat exchanger; the control system is used to obtain a first relationship based on the suction temperature and the evaporation temperature by collecting the discharge temperature of the compressor, the suction temperature of the compressor, the evaporation temperature of the evaporator, the ambient dry-bulb temperature of the evaporator, and the water tank temperature of the water-side heat exchanger, and, a second relationship based on the discharge temperature and the water tank temperature, the electronic expansion valve includes a main electronic expansion valve and a bypass electronic expansion valve; the main electronic expansion valve and the bypass electronic expansion valve are connected in parallel; the evaporator is respectively connected to the dryer filter through the main electronic expansion valve and the bypass electronic expansion valve; the control system includes, a data acquisition module for collecting the discharge temperature, the suction temperature, the evaporation temperature, the ambient dry-bulb temperature, and the water tank temperature; a data processing module for obtaining the first relationship and the second relationship according to the temperature data obtained by the data acquisition module, and obtaining a control instruction according to the first relationship and the second relationship; a control module for controlling the variable-frequency air-source heat pump pool unit to perform defrosting work according to the control instruction; a data storage module for storing the data generated by the control system; the compressor is a variable-frequency compressor; the compressor operating frequencies of the variable-frequency compressor include a first frequency, a second frequency, a third frequency, and a fourth frequency, wherein the first frequency is greater than the second frequency, the second frequency is greater than the third frequency, and the third frequency is greater than the fourth frequency; the first opening platform values of the main electronic expansion valve include a first opening, a second opening, a third opening, and a fourth opening, wherein the first opening is greater than the second opening, the second opening is greater than the third opening, and the third opening is greater than the fourth opening; the second opening platform values of the bypass electronic expansion valve include a fifth opening, a sixth opening, a seventh opening, and an eighth opening, wherein the fifth opening is greater than the sixth opening, the sixth opening is greater than the seventh opening, and the seventh opening is greater than the eighth opening; the control system is further used to adjust the first opening platform value and the second opening platform value according to the discharge temperature and the first relationship, wherein the greater the discharge temperature and the first relationship, the greater the first opening platform value and the second opening platform value; The control system is also used to adjust the second opening platform value of the bypass electronic expansion valve according to the exhaust gas temperature and the second relationship, wherein, the greater the exhaust gas temperature and the second relationship, the greater the second opening platform value; According to the first relationship and the second relationship, control the variable frequency air source heat pump pool unit.

2. The variable frequency air source heat pump pool machine system according to claim 1, characterized in that: The four-way reversing valve includes a first air inlet, a second air inlet, a first air outlet, and a second air outlet; The first air inlet is connected to the compressor; The second air inlet is connected to the evaporator; The first air outlet is connected to the water side heat exchanger; The second air outlet is connected to the gas-liquid separator.

3. The variable frequency air source heat pump pool machine system according to claim 2, characterized in that: The control system further includes, a display module for displaying the exhaust gas temperature, the suction temperature, the evaporation temperature, the ambient dry bulb temperature, the water tank temperature, and the progress of the defrosting operation.

4. The variable frequency air source heat pump pool machine system according to claim 3, characterized in that: The control system is also used to control the system to perform the defrosting operation by collecting the ambient temperature and the water temperature of the pool, and while keeping the water temperature unchanged, by adjusting the compressor frequency, the motor stop time, and the time difference of the four-way reversing valve switching action, wherein, when the ambient temperature and the water temperature are in low temperature conditions, the compressor frequency is adjusted to the first frequency, the motor stop time is shortened to the first stop time, and the time difference of the four-way reversing valve switching action is shortened to the first time difference; when the ambient temperature is in low temperature conditions and the water temperature is in high temperature conditions, the compressor frequency is adjusted to the second frequency, the motor stop time is shortened to the second stop time, and the time difference of the four-way reversing valve switching action is shortened to the second time difference, wherein, the second stop time is greater than the first stop time, and the second time difference is greater than the first time difference; when the ambient temperature is in relatively high temperature conditions and the water temperature is in low temperature conditions, the compressor frequency is adjusted to the third frequency, the motor stop time is lengthened to the third stop time, and the time difference of the four-way reversing valve switching action is lengthened to the third time difference, wherein, the third stop time is greater than the second stop time, and the third time difference is greater than the second time difference; when the ambient temperature is in relatively high temperature conditions and the water temperature is in relatively high temperature conditions, the compressor frequency is adjusted to the fourth frequency, the motor stop time is lengthened to the fourth stop time, and the time difference of the four-way reversing valve switching action is lengthened to the fourth time difference, wherein, the fourth stop time is greater than the third stop time, and the fourth time difference is greater than the third time difference.

5. The variable frequency air source heat pump pool machine system according to claim 4, characterized in that: The control system is also used to keep the water temperature unchanged, When increasing the frequency of the compressor, the first opening degree platform value is increased, and at the same time, the second opening degree platform value is decreased; When decreasing the frequency of the compressor, the first opening degree platform value is decreased, and at the same time, the second opening degree platform value is increased.

6. The variable-frequency air source heat pump pool machine system according to claim 5, characterized in that: The ambient temperature includes a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range; The first temperature range includes 5 to 15 °C; The second temperature range includes -5 to 5 °C; The third temperature range includes -15 to -5 °C; The fourth temperature range includes -35 to -15 °C.

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