Variable-frequency swimming pool machine control method

Abstract

The invention relates to a variable-frequency swimming pool machine control method, which belongs to the technical field of swimming pool machines, and comprises the following steps: detecting the water inlet temperature, comparing the water inlet temperature with a set temperature, and judging whether temperature control work needs to be carried out, namely judging whether heating work or refrigerating work needs to be carried out; and when the water inlet temperature reaches the preset interval, the equipment stops working, energy consumption of the equipment can be effectively reduced, and the effects of energy conservation and efficiency improvement are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pool machines, and particularly relates to a control method for a variable-frequency pool machine. Background Art

[0002] A pool can provide a stable and suitable water temperature environment. Generally, a pool machine is used to regulate the water temperature in the pool. However, the existing pool machines have the problem of low energy utilization rate. When regulating the water temperature of the pool, a large amount of energy is often consumed. Summary of the Invention

[0003] To solve at least one of the above problems existing in the prior art, the present invention provides a control method for a variable-frequency pool machine.

[0004] The object of the present invention can be achieved by the following technical solutions:

[0005] A control method for a variable-frequency pool machine includes selecting a working mode, detecting environmental parameters, and controlling the device according to the environmental parameters;

[0006] Among them, the working modes include:

[0007] Refrigeration mode: When the inlet water temperature is not less than the sum of the set temperature and the preset starting temperature difference, control the device to perform refrigeration work; when the inlet water temperature is not greater than the difference between the set temperature and the preset constant temperature difference, control the device to stop refrigeration work;

[0008] Heating mode: When the inlet water temperature is not greater than the difference between the set temperature and the preset starting temperature difference, control the device to perform heating work; when the inlet water temperature is not less than the sum of the set temperature and the preset constant temperature difference, control the device to stop heating work;

[0009] Automatic mode: When the inlet water temperature is not greater than the first set temperature, control the device to perform heating work; when the inlet water temperature is not less than the second set temperature, control the device to perform refrigeration work; when the inlet water temperature is equal to the set temperature, control the device to stop running.

[0010] In a further embodiment of the present invention, when the device performs heating work, the fan start is set to low wind operation, and the environmental temperature is detected;

[0011] When the fan is in low wind operation, when it is detected that the environmental temperature is not greater than 29°C, the fan is set to medium wind operation;

[0012] When the fan is in medium wind operation, when it is detected that the environmental temperature is not less than 30°C, the fan is set to low wind operation; when it is detected that the environmental temperature is not greater than 16°C, the fan is set to high wind operation;

[0013] When the fan is operating at high speed, if the detected ambient temperature is not less than 17°C, the fan is set to medium speed operation.

[0014] In a further embodiment of the present invention, when the device is performing refrigeration work, the fan starts and is set to low speed operation, and the ambient temperature is detected;

[0015] When the fan is operating at low speed, if the detected ambient temperature is not less than 17°C, the fan is set to medium speed operation;

[0016] When the fan is operating at medium speed, if the detected ambient temperature is not greater than 15°C, the fan is set to low speed operation; if the detected ambient temperature is not less than 27°C, the fan is set to high speed operation;

[0017] When the fan is operating at high speed, if the detected ambient temperature is not greater than 25°C, the fan is set to medium speed operation.

[0018] In a further embodiment of the present invention, when the compressor starts to work, it first operates at 50Hz for 60s, and then adjusts to the target frequency for operation;

[0019] When the compressor is performing normal heating work, its target frequency is jointly determined by the ambient temperature and the water temperature difference. By detecting the ambient temperature and the water temperature difference, and pairing the target frequency corresponding to the ambient temperature and the target frequency corresponding to the water temperature difference, the smaller of the two target frequencies is taken as the operating frequency;

[0020] When the compressor is performing strong heating work or silent heating work, its target frequency is determined by the ambient temperature and the inlet water temperature. By detecting the ambient temperature and pairing the corresponding target frequency as the working frequency, when the inlet water temperature reaches the set temperature, the compressor gradually reduces the frequency until it stops; where the first set temperature is the sum of the preset set temperature and the temperature return difference, and the second set temperature is the difference between the preset set temperature and the temperature return difference.

[0021] In a further embodiment of the present invention, when the compressor starts to work, it first operates at 50Hz for 60s, and then adjusts to the target frequency for operation;

[0022] When the compressor is performing normal refrigeration work, the target frequency of the compressor operation is 65Hz;

[0023] When the compressor is performing strong refrigeration work, the target frequency of the compressor operation is 90Hz;

[0024] When the compressor is performing silent refrigeration work, the target frequency of the compressor operation is 50Hz.

[0025] In a further embodiment of the present invention, after the device is powered on, the expansion valve first resets, and then adjusts the opening according to the working mode;

[0026] When the expansion valve is in the manual adjustment mode, the opening degree of the expansion valve is 350P;

[0027] When the expansion valve is in the automatic adjustment mode and the device is in the refrigeration operation, the opening degree is 450P;

[0028] When the expansion valve is in the automatic adjustment mode and the device is in the heating operation, the opening degree of the expansion valve is:

[0029] P = P0 + ▽P,

[0030] wherein, P is the opening degree of the expansion valve, P0 is the initial opening degree of the expansion valve controlled by the ambient temperature, and ▽P is the change amount of the opening degree determined by the average superheat and the target superheat.

[0031] In a further embodiment of the present invention, the change amount of the opening degree of the expansion valve is:

[0032] ▽P = K P *(SH - TSH),

[0033] SH = T S -T P ,

[0034] When SH ≤ -1, K P = 3;

[0035] When -1 < SH ≤ 0, K P = 2;

[0036] When SH > 0, K P = 1;

[0037] When SH > 0 and 0 < TSH - SH ≤ 1, K P = 0;

[0038] wherein, K P is a coefficient, SH is the average value of the actual superheat degree within 30s, TSH (Target Superheat) is the target superheat degree, TS is the compressor suction temperature, and TP is the outdoor coil temperature.

[0039] In a further embodiment of the present invention, when the expansion valve is in the automatic adjustment mode, exhaust protection is provided; when the exhaust temperature is not less than 95 °C, the expansion valve opens 20 steps every 30s, and when the exhaust temperature is not less than 105 °C, the expansion valve opens to 480P; when the exhaust temperature is not greater than 92 °C, the opening degree of the expansion valve is:

[0040] P = P0 + ▽P,

[0041] ▽P = KP*(SH - TSH),

[0042] SH = TS - TP,

[0043] When SH ≤ -1, KP = 3;

[0044] When -1 < SH ≤ 0, KP = 2;

[0045] When SH > 0, KP = 1;

[0046] When SH > 0 and 0 < TSH - SH ≤ 1, KP = 0;

[0047] Wherein, P is the opening degree of the expansion valve, P0 is the initial opening degree of the expansion valve, KP is the coefficient, SH is the average value of the actual superheat degree within 30s, TSH is the target superheat degree, TS is the return air temperature of the compressor, and TP is the outdoor coil temperature.

[0048] In a further embodiment of the present invention, when the external environmental temperature is not greater than 10°C and the exhaust gas temperature is not less than 61°C, the main electronic expansion valve is prohibited from closing; when the external environmental temperature is greater than 10°C and less than 25°C and the exhaust gas temperature is not less than 65°C, the main electronic expansion valve is prohibited from closing; when the external environmental temperature is not less than 25°C and the exhaust gas temperature is not less than 70°C, the main electronic expansion valve is prohibited from closing.

[0049] In a further embodiment of the present invention, the equipment needs to be spaced 10 minutes between switching between refrigeration operation and heating operation.

[0050] The beneficial effects of the present invention are: by detecting the inlet water temperature and comparing the inlet water temperature with the set temperature to determine whether temperature control work is required, that is, to determine whether heating work or refrigeration work is required; when the inlet water temperature reaches the preset range, the equipment stops working, which can effectively reduce the energy consumption of the equipment and achieve the effect of energy saving and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0052] Figure 1 It is the control diagram of the fan speed during heating operation provided by the present invention in an embodiment;

[0053] Figure 2 It is the control diagram of the fan speed during refrigeration operation provided by the present invention in an embodiment;

[0054] Figure 3 It is the compressor frequency gear table provided by the present invention in an embodiment;

[0055] Figure 4 It is the control diagram of the compressor frequency gear and the environmental temperature during normal heating provided by the present invention in an embodiment;

[0056] Figure 5 This is a control chart of the compressor frequency level versus the water temperature difference provided in an embodiment of the present invention during normal heating;

[0057] Figure 6 This is a control chart of the compressor frequency level versus the ambient temperature provided in an embodiment of the present invention during strong heating;

[0058] Figure 7 This is a control chart of the compressor frequency level versus the ambient temperature provided in an embodiment of the present invention during silent heating;

[0059] Figure 8 This is a comparison table of the opening degree of the electronic expansion valve provided in an embodiment of the present invention. Detailed implementation manners

[0060] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features, and their effects of the present invention as follows.

[0061] A variable-frequency pool machine control method provided in an embodiment of the present invention includes selecting a working mode, detecting environmental parameters, and controlling the device according to the environmental parameters;

[0062] Among them, the working modes include:

[0063] Refrigeration mode: When the inlet water temperature is not less than the sum of the set temperature and the preset start-up temperature difference, control the device to perform refrigeration work; when the inlet water temperature is not greater than the difference between the set temperature and the preset constant-temperature temperature difference, control the device to stop refrigeration work;

[0064] Heating mode: When the inlet water temperature is not greater than the difference between the set temperature and the preset start-up temperature difference, control the device to perform heating work; when the inlet water temperature is not less than the sum of the set temperature and the preset constant-temperature temperature difference, control the device to stop heating work;

[0065] Automatic mode: When the inlet water temperature is not greater than the first set temperature, control the device to perform heating work; when the inlet water temperature is not less than the second set temperature, control the device to perform refrigeration work; when the inlet water temperature is equal to the set temperature, control the device to stop running; where the first set temperature is the sum of the preset set temperature and the temperature return difference value, and the second set temperature is the difference between the preset set temperature and the temperature return difference value.

[0066] Among them, the temperature return difference value is a user-predefined value. When the temperature return difference value is 1, the first set temperature is the difference between the user-predefined set temperature and 1, and the second set temperature is the sum of the user-predefined set temperature and 1.

[0067] In this embodiment, by detecting the inlet water temperature and comparing it with the set temperature, it is determined whether temperature control work needs to be carried out, that is, it is determined whether heating work or refrigeration work needs to be carried out; when the inlet water temperature reaches the preset range, the device stops working, which can effectively reduce the energy consumption of the device and achieve the effect of energy saving and efficiency improvement.

[0068] At the same time, the water temperature of the swimming pool is controlled from multiple aspects through multiple devices such as a fan, an expansion valve, and a compressor, effectively improving the energy efficiency of the swimming pool machine.

[0069] Furthermore, the swimming pool machine is also provided with a defrosting mode.

[0070] Among them, the conditions for entering the heating defrosting are: when the device is running in the heating mode, the cumulative running time of the compressor is not less than 45 minutes, and the continuous running time of the compressor is not less than 5 minutes. At the same time, when the temperature of the outer coil is less than -1°C, the device enters the defrosting mode; if the temperature of the outer coil fails and the temperature of the outer coil cannot be detected, the system exits the defrosting mode and shuts down.

[0071] The conditions for entering defrosting at startup are: when the shutdown or standby or the power-off time of the compressor is not less than 30 minutes, and the coil temperature is less than parameter 5, enter the defrosting mode.

[0072] The conditions for exiting the defrosting mode are: after the defrosting mode has run for 2 minutes and the temperature of the outer coil is not less than 20°C; or the defrosting time reaches 10 minutes.

[0073] After the system enters the defrosting mode, the following operations are performed:

[0074] a. When the conditions for entering defrosting are met, the following actions are performed:

[0075] The frequency of the compressor is reduced to 30 Hz;

[0076] At 50 s, the four-way valve is powered on and the fan is turned off;

[0077] At 60 s, the frequency of the compressor is increased to the defrosting frequency of 60 Hz;

[0078] The water pump keeps running.

[0079] b. When the conditions for exiting defrosting are met, the following actions are performed:

[0080] The frequency of the compressor is reduced to 30 Hz;

[0081] At 55 s, the four-way valve loses power and the fan is turned on;

[0082] At 60 s, the frequency of the compressor is increased to resume normal heating operation.

[0083] When the following situation occurs when the system is in the defrosting mode, the defrosting mode ends abnormally:

[0084] When a fault protection shutdown occurs during defrosting, the system immediately exits defrosting and stops running;

[0085] Low-pressure protection is not detected during defrosting.

[0086] Please refer to Figure 1 , in a further embodiment of the present invention, when the device is in the heating operation, the fan is started to operate at low speed, and the ambient temperature is detected;

[0087] When the fan is operating at low speed, when it is detected that the ambient temperature is not greater than 29 °C, the fan is set to operate at medium speed;

[0088] When the fan is operating at medium speed, when it is detected that the ambient temperature is not less than 30 °C, the fan is set to operate at low speed; when it is detected that the ambient temperature is not greater than 16 °C, the fan is set to operate at high speed;

[0089] When the fan is operating at high speed, when it is detected that the ambient temperature is not less than 17 °C, the fan is set to operate at medium speed.

[0090] Please refer to Figure 2 , in a further embodiment of the present invention, when the device is in the refrigeration operation, the fan is started to operate at low speed, and the ambient temperature is detected;

[0091] When the fan is operating at low speed, when it is detected that the ambient temperature is not less than 17 °C, the fan is set to operate at medium speed;

[0092] When the fan is operating at medium speed, when it is detected that the ambient temperature is not greater than 15 °C, the fan is set to operate at low speed; when it is detected that the ambient temperature is not less than 27 °C, the fan is set to operate at high speed;

[0093] When the fan is operating at high speed, when it is detected that the ambient temperature is not greater than 25 °C, the fan is set to operate at medium speed. In a further embodiment of the present invention, the device further includes a water pump, and the water pump includes the following three working modes:

[0094] a. Keep running.

[0095] b. Before the compressor is turned on, the water pump runs 30 s in advance; after the compressor is turned off, the water pump is turned off with a 2-min delay.

[0096] c. Before the compressor is turned on, the water pump runs 30 s in advance; when the compressor is turned off, the water pump stops running for 60 min every 5 min of operation.

[0097] , in a further embodiment of the present invention, the device further includes a four-way valve. When the device is in the heating operation, the four-way valve is de-energized; when the device is in the refrigeration operation or defrosting operation, the four-way valve is energized.

[0098] In a further embodiment of the present invention, the device further includes crankshaft electric heating, which is turned on when the ambient temperature is not greater than 0°C and the compressor is turned off; and turned off when the ambient temperature is greater than 4°C or the compressor is turned on.

[0099] In a further embodiment of the present invention, the device further includes chassis electric heating, which is turned on when the ambient temperature is not greater than 0°C and the compressor is turned on; and turned off when the ambient temperature is greater than 4°C or the compressor is turned off.

[0100] In a further embodiment of the present invention, the device further includes electric heating.

[0101] Wherein, during heating, when electric heating is selected, it is turned on when any of the following conditions is met and the water pump runs for more than 30s:

[0102] a. Defrosting and secondary anti-freezing force electric heating on;

[0103] b. The inlet water temperature is not greater than the difference between the heating set temperature and the heating start return difference and the ambient temperature is less than the electric heating start ambient temperature;

[0104] c. The inlet water temperature is not greater than the difference between the heating set temperature and the heating start return difference and a ambient temperature fault occurs;

[0105] d. The inlet water temperature is not greater than the difference between the heating set temperature and the heating start return difference and the compressor fails and stops for more than 5 minutes

[0106] When any of the following conditions is met, the electric heating is turned off:

[0107] a. In the refrigeration mode;

[0108] b. The ambient temperature is greater than the electric heating start ambient temperature;

[0109] c. The inlet water temperature is not less than the heating set temperature;

[0110] d. The water pump runs for less than 30s.

[0111] In a further embodiment of the present invention, when the compressor starts to work, it first runs at 50Hz for 60s, and then adjusts to the target frequency for operation;

[0112] When the compressor is performing normal heating work, its target frequency is jointly determined by the ambient temperature and the water temperature difference. By detecting the ambient temperature and the water temperature difference, and pairing the target frequency corresponding to the ambient temperature and the target frequency corresponding to the water temperature difference, the smaller of the two target frequencies is taken as the operating frequency;

[0113] When the compressor operates in high-power heating mode or silent heating mode, its target frequency is determined by the ambient temperature and the inlet water temperature. By detecting the ambient temperature, the corresponding target frequency is paired as the operating frequency. When the inlet water temperature reaches the set temperature, the compressor gradually reduces its frequency until it stops.

[0114] Among them, when the compressor shuts down, enters the constant-temperature shutdown state, or the linkage switch is disconnected, the compressor reduces its frequency at a rate of 1HZ / s until it stops. When the compressor stops due to fault protection, it stops immediately without frequency reduction.

[0115] Please refer to Figure 3 , in this embodiment, the operating frequency of the compressor is divided into eleven levels from F0 to F10 from low to high. When the system runs in the defrosting mode, the frequency of the compressor is fixed at 60Hz.

[0116] Please refer to Figures 4 - 5 , when the equipment operates in normal heating mode, the operating frequency of the compressor is jointly determined by the ambient temperature and the inlet water temperature. Each of them corresponds to a different frequency, and the smaller one is taken as the operating frequency of the compressor. Among them, Figure 4 is the comparison chart of the compressor target frequency level and the ambient temperature when the equipment operates in normal heating mode, Figure 5 is the comparison chart of the compressor target frequency level and the water temperature difference when the equipment operates in normal heating mode. The water temperature difference is the difference between the inlet water temperature and the set temperature.

[0117] Among them, please refer to Figure 4 , when the ambient temperature rises, the ambient temperature needs to be greater than the temperature on the right side of the level for the frequency level of the compressor to change. When the operating frequency of the compressor is at level F10, the ambient temperature needs to be greater than 21 degrees Celsius for the operating frequency of the compressor to be adjusted from level F10 to level F9. When the operating frequency of the compressor is at level F9, the ambient temperature needs to be greater than 24 degrees Celsius for the operating frequency of the compressor to be adjusted from level F9 to level F8. When the ambient temperature drops, the ambient temperature needs to be less than the temperature on the left side of the level for the frequency level of the compressor to change. When the operating frequency of the compressor is at level F9, the ambient temperature needs to be less than 20 degrees Celsius for the operating frequency of the compressor to drop from level F9 to level F10. When the operating frequency of the compressor is at level F10, the ambient temperature needs to be less than -15 degrees Celsius for the operating frequency of the compressor to drop from level F10 to level F0.

[0118] There is a difference between the temperature values at which the compressor switches between two gears. For example, when the compressor is in gear F10, the ambient temperature needs to be less than -15 °C for the compressor to switch to gear F0. When the compressor is in gear F0, the ambient temperature needs to be greater than -13 °C for the compressor to switch to gear F10. There is a difference between the switching temperature values of the compressor between gear F10 and gear F0, which avoids the same switching temperature value and frequent switching of the working gear of the compressor when the ambient temperature is close to the switching temperature.

[0119] Please refer to Figure 6 , when the equipment is operating in strong heating mode, the operating frequency of the compressor is determined by the ambient temperature. When the inlet water temperature reaches the preset temperature, the compressor reduces its frequency until it stops. Among them, Figure 6 is the control chart of the compressor target frequency gear and the ambient temperature when the equipment is operating in strong heating mode.

[0120] When the inlet water temperature rises, the frequency gear of the compressor changes only when the inlet water temperature is greater than the temperature on the right side of the gear. When the operating frequency of the compressor is in gear F10, the inlet water temperature needs to be greater than 29 °C for the operating frequency of the compressor to adjust from gear F10 to gear F9. When the operating frequency of the compressor is in gear F9, the inlet water temperature needs to be greater than 45 °C for the operating frequency of the compressor to adjust from gear F9 to gear F0. When the inlet water temperature drops, the frequency gear of the compressor changes only when the inlet water temperature is less than the temperature on the left side of the gear. When the operating frequency of the compressor is in gear F9, the ambient temperature needs to be less than 28 °C for the operating frequency of the compressor to drop from gear F9 to gear F10. When the operating frequency of the compressor is in gear F10, the inlet water temperature needs to be less than -15 °C for the operating frequency of the compressor to drop from gear F10 to gear F0.

[0121] Please refer to Figure 7 , when the equipment is operating in silent heating mode, the operating frequency of the compressor is controlled according to the ambient temperature and the inlet water temperature. Before the inlet water temperature reaches the constant temperature control area, the compressor operates at the highest frequency corresponding to each gear. As Figure 7 shown in the table in Figure 7 is the control chart of the compressor target frequency gear and the ambient temperature when the equipment is operating in silent heating mode.

[0122] When the inlet water temperature rises, the frequency gear of the compressor will change only when the inlet water temperature is higher than the temperature on the right side of the gear. When the operating frequency of the compressor is at gear F10, the inlet water temperature needs to be higher than 29 °C for the operating frequency of the compressor to be adjusted from gear F10 to gear F9. When the operating frequency of the compressor is at gear F9, the inlet water temperature needs to be higher than 45 °C for the operating frequency of the compressor to be adjusted from gear F9 to gear F0. When the inlet water temperature drops, the frequency gear of the compressor will change only when the inlet water temperature is lower than the temperature on the left side of the gear. When the operating frequency of the compressor is at gear F9, the ambient temperature needs to be lower than 28 °C for the operating frequency of the compressor to drop from gear F9 to gear F10. When the operating frequency of the compressor is at gear F10, the inlet water temperature needs to be lower than -15 °C for the operating frequency of the compressor to drop from gear F10 to gear F0.

[0123] Furthermore, after the compressor shuts down, it needs to be at least 3 minutes before it can be turned on. Among them, when the device is powered on for the first time, the compressor has no 3-minute protection.

[0124] In a further embodiment of the present invention, when the compressor starts to work, it first runs at 50 Hz for 60 s and then adjusts to the target frequency for operation.

[0125] When the compressor is operating in normal refrigeration mode, the target frequency of the compressor is 65 Hz.

[0126] When the compressor is operating in strong refrigeration mode, the target frequency of the compressor is 90 Hz.

[0127] When the compressor is operating in silent refrigeration mode, the target frequency of the compressor is 50 Hz.

[0128] Among them, after the water temperature reaches the set temperature, the compressor reduces its frequency until it stops.

[0129] In a further embodiment of the present invention, after the device is powered on, the expansion valve first resets and then adjusts its opening according to the working mode.

[0130] When the expansion valve is in the manual adjustment mode, the opening of the expansion valve is 350P.

[0131] When the expansion valve is in the automatic adjustment mode and the device is in refrigeration operation, the opening of the expansion valve is 450P.

[0132] When the expansion valve is in the automatic adjustment mode, the opening of the expansion valve is:

[0133] P = P0 + ▽P,

[0134] Among them, P is the opening of the expansion valve, P0 is the initial opening of the expansion valve controlled by the ambient temperature, and ▽P is the change in opening determined by the average superheat and the target superheat.

[0135] Among them, the initial opening degree is controlled according to the ambient temperature:

[0136] When the ambient temperature is not less than 35°C, the initial opening degree is 450P;

[0137] When the ambient temperature is not less than 30°C and less than 35°C, the initial opening degree is 400P;

[0138] When the ambient temperature is not less than 25°C and less than 30°C, the initial opening degree is 350P;

[0139] When the ambient temperature is not less than 20°C and less than 25°C, the initial opening degree is 300P;

[0140] When the ambient temperature is not less than 15°C and less than 20°C, the initial opening degree is 250P;

[0141] When the ambient temperature is less than 15°C, the initial opening degree is 200P.

[0142] In a further embodiment of the present invention, the change amount of the opening degree of the expansion valve is:

[0143] ▽P = K P *(SH - TSH),

[0144] SH = T S -T P ,

[0145] When SH ≤ -1, K P = 3;

[0146] When -1 < SH ≤ 0, K P = 2;

[0147] When SH > 0, K P = 1;

[0148] When SH > 0 and 0 < TSH - SH ≤ 1, K P = 0;

[0149] Among them, K P is a coefficient, SH is the average value of the actual superheat degree within 30s, TSH is the target superheat degree, T S is the suction gas temperature of the compressor, T P is the outdoor coil temperature.

[0150] SH is the average value of the actual superheat degree within 30s, sampled once every 5s, and the action period of the electronic expansion valve is 30s

[0151] Please refer to Figure 8 , in a further embodiment of the present invention, the relationship between the opening degree of the expansion valve in the manual mode and the water inlet temperature, the ambient temperature, and the compressor frequency is asFigure 8 As shown in the table.

[0152] like Figure 8 As shown, through Figure 8 When querying the expansion valve opening, first Figure 8 The upper part of the table queries the relationship between the opening, the inlet water temperature and the ambient temperature, and then Figure 8 The upper part of the table queries the relationship between the opening and the operating frequency of the compressor. For example, when the inlet water temperature is less than 20 degrees Celsius and the ambient temperature is not less than 25 degrees Celsius, Figure 8 From the upper part of the table, it can be concluded that the relationship between the opening degree and the inlet water temperature and the ambient temperature is A1; A2; A3; A4; A5; and then the relationship with the operating frequency of the compressor is queried. When the operating frequency of the compressor is gear F1 or gear F2, the opening degree of the expansion valve is 300P; when the operating frequency of the compressor is gear F3 or gear F4, the opening degree of the expansion valve is 430P; when the operating frequency of the compressor is gear F5 or gear F6, the opening degree of the expansion valve is 450P; when the operating frequency of the compressor is gear F7 or gear F8, the opening degree of the expansion valve is 450P; when the operating frequency of the compressor is gear F9 or gear F10, the opening degree of the expansion valve is 450P.

[0153] In a further embodiment of the present invention, when the expansion valve is in automatic adjustment mode, exhaust protection is provided; when the exhaust temperature is not less than 95°C, the expansion valve is opened 20 steps every 30s, and when the exhaust temperature is not less than 105°C, the expansion valve is opened to 480P; when the exhaust temperature is not greater than 92°C, the opening of the expansion valve is:

[0154] P=P0+▽P,

[0155] ▽P=KP*(SH-TSH),

[0156] SH=TS-TP,

[0157] When SH≤-1, KP=3;

[0158] When -1<SH≤0, KP=2;

[0159] When SH>0, KP=1;

[0160] When SH>0 and 0<TSH-SH≤1, KP=0;

[0161] Among them, P is the expansion valve opening, P0 is the initial opening of the expansion valve, KP is the coefficient, SH is the average value of the actual superheat within 30 seconds, TSH is the target superheat, TS is the compressor return air temperature, and TP is the outdoor coil temperature.

[0162] In a further embodiment of the present invention, when the external environment temperature is not greater than 10°C and the exhaust gas temperature is not less than 61°C, the main electronic expansion valve is prohibited from closing; when the external environment temperature is greater than 10°C and less than 25°C and the exhaust gas temperature is not less than 65°C, the main electronic expansion valve is prohibited from closing; when the external environment temperature is not less than 25°C and the exhaust gas temperature is not less than 70°C, the main electronic expansion valve is prohibited from closing.

[0163] In a further embodiment of the present invention, the switching between refrigeration operation and heating operation requires an interval of 10 minutes.

[0164] In this embodiment, in order to protect the equipment from shortening its service life due to frequent switching of working modes, the switching between the heating operation and the refrigeration operation of the equipment requires an interval of 10 minutes. When an emergency situation requiring immediate switching of the working mode occurs, the interval of 10 minutes can be cancelled by turning off the equipment and then turning it on again.

[0165] In a further embodiment of the present invention, it includes equipment abnormal protection.

[0166] 1) When the frequency conversion module has protections such as overheating and overcurrent, the compressor immediately stops running.

[0167] 2) Radiator temperature protection.

[0168] a. The compressor frequency is controlled by the radiator temperature; when the radiator temperature enters a more severe range, it is immediately judged and responded to;

[0169] b. When the temperature reaches 114°C, the IPM enters the frequency reduction protection state. First, the frequency is reduced by 10 Hz and maintained for 8 minutes. If it fails to drop to the frequency reduction return value of 100°C, it will continue to reduce the frequency by 2 Hz and maintain it for 5 minutes until the frequency reduction reaches the return value of 100°C.

[0170] c. If the temperature continues to rise during the frequency reduction period and reaches 118°C, the IPM over-temperature protection shuts down the machine and the compressor stops running. It will not run again until the temperature drops to 115°C and the IPM temperature fault is eliminated.

[0171] d. When a fault occurs, the wired controller reports a maintenance fault.

[0172] 3) Exhaust gas temperature protection.

[0173] The control of the compressor frequency by the exhaust gas temperature TE is as follows:

[0174] a. After TE is not less than 110°C and lasts for 5 seconds, the compressor stops;

[0175] b. When TE is not less than 100°C and less than 110°C, the compressor drops 1 Hz / 5 s. If it has dropped to the lowest frequency, it will maintain the current frequency;

[0176] c. When TE is not less than 92°C and less than 100°C, the compressor frequency is prohibited from increasing;

[0177] d. When TE is less than 86°C, the compressor frequency is controlled normally.

[0178] Among them, after the exhaust temperature protection is executed for 3 minutes, if TE is not greater than 86°C, the operation is resumed.

[0179] 4) Outdoor coil high temperature protection.

[0180] Outdoor coil T O The control of the compressor frequency is as follows:

[0181] a. T O If it is not less than 65°C for 10 consecutive seconds, the compressor stops;

[0182] b. T O If it is not less than 60°C and less than 65°C, the compressor frequency decreases by 1 Hz / 5 s. If it has reached the minimum frequency, the current frequency is maintained;

[0183] c. T O If it is not less than 55°C and less than 60°C, the compressor frequency is prohibited from increasing;

[0184] d. T O If it is not greater than 50°C, the compressor operates normally.

[0185] Among them, after the compressor stops due to the high temperature protection of the outdoor coil temperature for 3 minutes, and T O If it is not greater than 50°C, the compressor resumes normal operation.

[0186] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A variable frequency swimming pool machine control method, characterized in that: Including selecting working mode, detecting environmental parameters and controlling the equipment according to environmental parameters; The working modes include: Cooling mode: When the inlet water temperature is not less than the sum of the set temperature and the preset start temperature difference, the control device performs cooling work; when the inlet water temperature is not greater than the difference between the set temperature and the preset constant temperature difference, the control device stops cooling work; Heating mode: When the inlet water temperature is not greater than the difference between the set temperature and the preset start temperature difference, the control device performs heating work; when the inlet water temperature is not less than the sum of the set temperature and the preset constant temperature difference, the control device stops heating work; Automatic mode: When the inlet water temperature is not greater than the first set temperature, the control device performs heating; when the inlet water temperature is not less than the second set temperature, the control device performs cooling; when the inlet water temperature is equal to the set temperature, the control device stops running; the first set temperature is the sum of the preset set temperature and the temperature return difference value, and the second set temperature is the difference between the preset set temperature and the temperature return difference value.

2. A variable frequency swimming pool machine control method according to claim 1, characterized in that: When the equipment is heating, the fan is started and set to low wind operation, and the ambient temperature is detected; When the fan is in low wind operation, if the ambient temperature is detected to be no greater than 29°C, the fan will be set to medium wind operation; When the fan is in medium wind operation, if the ambient temperature is detected to be not less than 30℃, the fan will be set to low wind operation; if the ambient temperature is detected to be not more than 16℃, the fan will be set to high wind operation; When the fan is in high wind operation, if the ambient temperature is detected to be not less than 17℃, the fan will be set to medium wind operation.

3. A variable frequency swimming pool machine control method according to claim 1, characterized in that: When the equipment is performing cooling work, the fan is started and set to low wind operation, and the ambient temperature is detected; When the fan is in low wind operation, if the ambient temperature is detected to be not less than 17℃, the fan will be set to medium wind operation; When the fan is in medium wind operation, if the ambient temperature is detected to be no greater than 15°C, the fan will be set to low wind operation; if the ambient temperature is detected to be no less than 27°C, the fan will be set to high wind operation; When the fan is in high wind operation, if it is detected that the ambient temperature is no more than 25℃, the fan will be set to medium wind operation.

4. A variable frequency swimming pool machine control method according to claim 1, characterized in that: When the compressor starts working, it will first run at 50Hz for 60s, and then adjust to the target frequency; When the compressor is performing normal heating work, its target frequency is determined by the ambient temperature and the water temperature difference. By detecting the ambient temperature and the water temperature difference, and matching the target frequency corresponding to the ambient temperature and the target frequency corresponding to the water temperature difference, the smaller target frequency is taken as the operating frequency; When the compressor is performing strong heating or silent heating, its target frequency is determined by the ambient temperature and the inlet water temperature. The corresponding target frequency is matched with the ambient temperature as the operating frequency. When the inlet water temperature reaches the set temperature, the compressor gradually reduces the frequency from the target frequency until it stops.

5. A variable frequency swimming pool machine control method according to claim 1, characterized in that: When the compressor starts working, it will first run at 50Hz for 60s, and then adjust to the target frequency; When the compressor performs normal cooling work, the target frequency of the compressor operation is 65Hz; When the compressor performs strong cooling work, the target frequency of the compressor operation is 90Hz; When the compressor is performing silent cooling operation, the target frequency of the compressor operation is 50Hz.

6. A variable frequency swimming pool machine control method according to claim 1, characterized in that: After the equipment is powered on, the expansion valve is reset first, and then the opening is adjusted according to the working mode; When the expansion valve is in manual adjustment mode, the expansion valve opening is 350P; When the expansion valve is in automatic adjustment mode and the equipment is in cooling operation, the opening is 450P; When the expansion valve is in automatic adjustment mode and the equipment is in heating operation, the expansion valve opening is: Among them, P is the expansion valve opening, P0 is the initial opening of the expansion valve controlled by the ambient temperature, and ▽P is the change in opening determined by the average superheat and the target superheat.

7. A variable frequency swimming pool machine control method according to claim 6, characterized in that: The change in the opening of the expansion valve is: SH=T S -T P , When SH≤-1, K P =3; When -1<SH≤0, K P =2; When SH>0, K P =1; When SH>0 and 0<TSH-SH≤1, K P =0; Among them, K P is the coefficient, SH is the average value of actual superheat within 30s, TSH is the target superheat, T S is the compressor return air temperature, T P is the outdoor coil temperature.

8. A variable frequency swimming pool machine control method according to claim 6, characterized in that: When the expansion valve is in automatic adjustment mode, exhaust protection is set; when the exhaust temperature is not less than 95°C, the expansion valve opens 20 steps every 30 seconds, and when the exhaust temperature is not less than 105°C, the expansion valve opens to 480P; when the exhaust temperature is not greater than 92°C, the opening of the expansion valve is: SH=TS-TP, When SH≤-1, KP=3; When -1<SH≤0, KP=2; When SH>0, KP=1; When SH>0 and 0<TSH-SH≤1, KP=0; Among them, P is the expansion valve opening, P0 is the initial opening of the expansion valve, KP is the coefficient, SH is the average value of the actual superheat within 30 seconds, TSH is the target superheat, TS is the compressor return air temperature, and TP is the outdoor coil temperature.

9. A variable frequency swimming pool machine control method according to claim 6, characterized in that: When the external ambient temperature is not greater than 10°C and the exhaust temperature is not less than 61°C, the main electronic expansion valve is prohibited from being closed down; when the external ambient temperature is greater than 10°C and less than 25°C and the exhaust temperature is not less than 65°C, the main electronic expansion valve is prohibited from being closed down; when the external ambient temperature is not less than 25°C and the exhaust temperature is not less than 70°C, the main electronic expansion valve is prohibited from being closed down.

10. A variable frequency swimming pool machine control method according to claim 1, characterized in that: The equipment needs to wait 10 minutes to switch between cooling and heating operations.

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