Control method of environment adjusting equipment, environment adjusting equipment and storage medium

Abstract

The invention discloses a control method of environment adjusting equipment, the environment adjusting equipment and a storage medium. The environment adjusting equipment comprises an air duct, a first heat pump system and a second heat pump system, the first heat pump system comprises a first heat exchanger, the second heat pump system comprises a second heat exchanger, and the first heat exchanger and the second heat exchanger are sequentially arranged in the air flow direction in the air duct. The method comprises the steps that a first heat pump system is controlled to operate in a first mode to enable a first heat exchanger to be in a condensation state, and a second heat pump system is controlled to operate in a third mode to enable a second heat exchanger to be in a condensation state; when the first heat pump system meets the mode switching condition, the first heat pump system is controlled to operate in a second mode, and a compressor in the second heat pump system is controlled to operate at reduced frequency; wherein the first heat exchanger is in an evaporation state in the second mode. The invention aims to reduce the oil shortage risk of the compressor and improve the operation reliability of the compressor when the operation mode of the heat pump system in the equipment is switched.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental control equipment, and particularly to a control method for environmental control equipment, environmental control equipment, and a storage medium. Background Art

[0002] Some environmental control equipment is provided with two heat pump systems to cooperate in regulating the temperature and humidity of air. During the heating operation of the equipment, in some cases, it is necessary to switch the operating mode of the system to change the heat exchange state of the heat exchanger. For example, when the heat exchanger in the evaporation state is prone to frosting, the system needs to switch to the defrosting operation to defrost and so on.

[0003] However, when the heat exchanger located upstream of the air duct switches from the condensation state to the evaporation state, the temperature of the air flowing to the downstream of the air duct will drop sharply, and the condensation pressure of the condenser located downstream of the air duct will fluctuate sharply, which will cause the lubricating oil level of the compressor to drop, and the compressor will be damaged due to lack of oil for a long time. Summary of the Invention

[0004] The main object of the present invention is to provide a control method for environmental control equipment, environmental control equipment, and a storage medium, aiming to reduce the risk of oil shortage in the compressor when the heat pump system in the equipment switches the operating mode and improve the operating reliability of the compressor.

[0005] To achieve the above object, the present invention provides a control method for environmental control equipment. The environmental control equipment includes an air duct, a first heat pump system, and a second heat pump system. The first heat pump system includes a first heat exchanger, and the second heat pump system includes a second heat exchanger. The first heat exchanger and the second heat exchanger are arranged in sequence along the air flow direction in the air duct. The control method for the environmental control equipment includes the following steps:

[0006] Control the first heat pump system to operate in the first mode so that the first heat exchanger is in the condensation state, and control the second heat pump system to operate in the third mode so that the second heat exchanger is in the condensation state;

[0007] When the first heat pump system meets the mode switching condition, control the first heat pump system to operate in the second mode, and control the compressor in the second heat pump system to operate at a reduced frequency;

[0008] Wherein, the first heat exchanger is in the evaporation state in the second mode.

[0009] Optionally, before the step of controlling the compressor in the second heat pump system to operate at a reduced frequency, it further includes:

[0010] When the first heat pump system meets the mode switching condition, obtain the state parameter representing the condensation temperature in the second heat pump system in the preset state and / or the operating frequency of the second heat pump system in the preset state, where the preset state is the state before the first heat pump system starts the second mode;

[0011] Determine the frequency adjustment value according to the state parameter and / or the operating frequency;

[0012] The step of controlling the compressor in the second heat pump system to operate at a reduced frequency includes:

[0013] Control the compressor in the second heat pump system to operate at a reduced frequency according to the frequency adjustment value.

[0014] Optionally, the state parameter includes a temperature parameter, and the step of determining the frequency adjustment value according to the state parameter and the operating frequency includes:

[0015] Determine the frequency adjustment value according to the temperature parameter and the operating frequency;

[0016] Wherein, the frequency adjustment value is positively correlated with the temperature parameter, and the frequency adjustment value is positively correlated with the operating frequency.

[0017] Optionally, the step of determining the frequency adjustment value according to the temperature parameter and the operating frequency includes:

[0018] When the temperature parameter is greater than the first preset temperature, determine the frequency adjustment value according to the first coefficient and the operating frequency;

[0019] When the temperature parameter is less than or equal to the first preset temperature and greater than or equal to the second preset temperature, determine the frequency adjustment value according to the second coefficient and the operating frequency;

[0020] Wherein, the first preset temperature is greater than the second preset temperature, and the first coefficient is greater than the second coefficient.

[0021] Optionally, after the step of obtaining the state parameter representing the condensation temperature in the second heat pump system in the preset state and / or the operating frequency of the second heat pump system in the preset state, it further includes:

[0022] When the temperature parameter is greater than or equal to the second preset temperature, execute the step of determining the frequency adjustment value according to the temperature parameter and the operating frequency.

[0023] Optionally, before the step of controlling the first heat pump system to operate in the first mode to make the first heat exchanger in a condensing state and controlling the second heat pump system to operate in the third mode to make the second heat exchanger in a condensing state, the following steps are further included:

[0024] Taking the target that the compressor in the second heat pump system reaches the target state when operating at the reduced frequency of the frequency adjustment value as the goal, a preset corresponding relationship among the state parameter, the operating frequency, and the frequency adjustment value is established;

[0025] The step of determining the frequency adjustment value according to the state parameter and the operating frequency includes:

[0026] Determining the frequency adjustment value corresponding to the state parameter and the operating frequency according to the preset corresponding relationship;

[0027] Wherein, the target state includes that the oil level height of the compressor in the second heat pump system is greater than or equal to the safe liquid level height when the operation duration in the switched - after mode reaches the preset duration.

[0028] Optionally, after the step of controlling the compressor in the second heat pump system to operate at a reduced frequency according to the frequency adjustment value, the following steps are further included:

[0029] When the operation duration of the first heat pump system in the switched - after mode reaches the preset duration, obtaining the current oil level height of the compressor in the second heat pump system;

[0030] When the current oil level height is less than the safe liquid level height, determining the height deviation value between the current oil level height and the safe liquid level height;

[0031] Correcting the preset corresponding relationship according to the height deviation value.

[0032] Optionally, after the step of controlling the first heat pump system to operate in the second mode and controlling the compressor in the second heat pump system to operate at a reduced frequency, the following steps are further included:

[0033] When the operation duration of the first heat pump system in the switched - after mode reaches the preset duration, obtaining the current oil level height of the compressor in the second heat pump system;

[0034] When the current oil level height is less than the safe liquid level height, controlling the first heat pump system to operate to increase the temperature of the first heat exchanger.

[0035] In addition, to achieve the above object, the present application further provides an environmental conditioning device, which includes a control device, an air duct, a first heat pump system, and a second heat pump system. The first heat pump system includes a first heat exchanger, and the second heat pump system includes a second heat exchanger. The first heat exchanger and the second heat exchanger are arranged in sequence along the air flow direction in the air duct;

[0036] Both the first heat pump system and the second heat pump system are connected to the control device, and the control device includes:

[0037] A memory, a processor, and a control program for the environmental conditioning device stored on the memory and executable on the processor. When the control program for the environmental conditioning device is executed by the processor, the steps of the control method for the environmental conditioning device as described in any one of the above are implemented.

[0038] In addition, to achieve the above object, the present application further provides a storage medium on which a control program for the environmental conditioning device is stored. When the control program for the environmental conditioning device is executed by a processor, the steps of the control method for the environmental conditioning device as described in any one of the above are implemented.

[0039] For a control method of an environmental conditioning device proposed by the present invention, the first heat exchanger in the first heat pump system and the second heat exchanger in the second heat pump system in the environmental conditioning device are arranged in sequence along the air flow direction in the air duct. When the heat exchangers upstream and downstream in the air duct are both in the condensation state and the upstream heat pump system meets the mode switching condition, when the upstream heat pump system switches the mode to switch the corresponding heat exchanger to the evaporation state, the compressor in the downstream heat pump system reduces its frequency. Based on this, when the air temperature flowing through the downstream heat exchanger drops sharply, the fluctuation of the condensation pressure in the downstream heat pump system can be effectively reduced, the reduction speed of the oil level in the compressor is effectively slowed down, and the reduction amount of the compressor lubricating oil can be effectively reduced, thereby ensuring that there is sufficient lubricating oil during the operation of the compressor, avoiding long-term lack of oil in the compressor, and improving the operation reliability of the compressor. Description of the Drawings

[0040] Figure 1 It is a schematic structural diagram of an embodiment of the environmental conditioning device of the present invention;

[0041] Figure 2 It is a schematic hardware structure diagram involved in the operation of an embodiment of the environmental conditioning device of the present invention;

[0042] Figure 3 It is a schematic flowchart of an embodiment of the control method of the environmental conditioning device of the present invention;

[0043] Figure 4 It is a schematic flowchart of another embodiment of the control method of the environmental conditioning device of the present invention.

[0044] The realization, functional features, and advantages of the present invention will be further described in conjunction with embodiments and with reference to the accompanying drawings. Detailed Embodiments

[0045] It should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0046] An embodiment of the present invention provides an environmental conditioning device.

[0047] In this embodiment, with reference to Figure 1 , where Figure 1 the arrows indicate the air flow direction in the air duct. The environmental conditioning device includes a control device 100, a supply air duct 01, a first heat pump system 1, and a second heat pump system 2. The first heat pump system 1 includes a first heat exchanger 11, and the second heat pump system 2 includes a second heat exchanger 21. The first heat exchanger 11 and the second heat exchanger 21 are arranged in sequence along the air flow direction in the supply air duct 01. Both the first heat pump system 1 and the second heat pump system 2 are connected to the control device 100.

[0048] In this embodiment, the supply air duct 01 communicates the indoor space with the outdoor environment. In other embodiments, the inlet and outlet of the supply air duct 01 can both communicate with the indoor space.

[0049] A supply air fan 31 is provided in the supply air duct 01. When the supply air fan 31 is turned on, it can drive outdoor air or indoor air into the supply air duct 01, and the air flows through the first heat exchanger 11 and the second heat exchanger 21 in sequence and then is sent into the indoor space.

[0050] The first heat pump system 1 includes a first compressor 12, a first heat exchanger 11, a first throttling device 13, and a third heat exchanger 14. The first heat exchanger 11, the first throttling device 13, and the third heat exchanger 14 are connected in sequence. One of the first heat exchanger 11 and the third heat exchanger 14 is communicated with the exhaust port of the first compressor 12, and the other of the first heat exchanger 11 and the third heat exchanger 14 is communicated with the suction port of the first compressor 12.

[0051] Among them, the third heat exchanger 14 can be arranged in the outdoor environment. Alternatively, the environmental conditioning device can further include an exhaust air duct 02 that communicates the indoor space with the outdoor environment. An exhaust air fan 32 can be provided in the exhaust air duct 02. The exhaust air fan 32 can drive indoor air to be discharged outdoors through the exhaust air duct 02, and the third heat exchanger 14 can be arranged in the exhaust air duct 02.

[0052] Further, in some embodiments, in addition to the first heat exchanger 11 and the third heat exchanger 14, the first heat pump system 1 may further include at least one fifth heat exchanger. The fifth heat exchanger may be connected in series or in parallel with the first heat exchanger 11. In the air supply duct 01, the fifth heat exchanger may be arranged along the air flow direction in the air supply duct 01 with the first heat exchanger 11, or may be arranged along a direction perpendicular to the air flow direction in the air supply duct 01.

[0053] The first heat pump system 1 further includes a first reversing assembly. The exhaust port and the suction port of the first compressor 12, the first heat exchanger 11, and the third heat exchanger 14 are all connected to the first reversing assembly. The operating states of the first reversing assembly include a first state and a second state. When the first reversing assembly operates in the first state, the exhaust port of the first compressor 12 is communicated with the first heat exchanger 11, and the suction port of the first compressor 12 is communicated with the third heat exchanger 14. When the first reversing assembly operates in the second state, the exhaust port of the first compressor 12 is communicated with the third heat exchanger 14, and the suction port of the first compressor 12 is communicated with the first heat exchanger 11.

[0054] The operating modes of the first heat pump system 1 may include a first mode and a second mode. In the first mode, the first heat exchanger 11 is in a condensing state. In the second mode, the first heat exchanger 11 is in an evaporating state.

[0055] When the first reversing assembly operates in the first state, the exhaust port of the first compressor 12 is communicated with the first heat exchanger 11, and the suction port of the first compressor 12 is communicated with the third heat exchanger 14. The refrigerant discharged from the first compressor 12 flows through the first heat exchanger 11, the first throttling device 13, and the third heat exchanger 14 in sequence and then returns to the first compressor 12. The first heat exchanger 11 is in a condensing state, the third heat exchanger 14 is in an evaporating state, and the first heat pump system 1 is in the first mode.

[0056] When the first reversing assembly operates in the second state, the exhaust port of the first compressor 12 is communicated with the third heat exchanger 14, and the suction port of the first compressor 12 is communicated with the first heat exchanger 11. The refrigerant discharged from the first compressor 12 flows through the third heat exchanger 14, the first throttling device 13, and the first heat exchanger 11 in sequence and then returns to the first compressor 12. The first heat exchanger 11 is in an evaporating state, the third heat exchanger 14 is in a condensing state, and the first heat pump system 1 is in the second mode.

[0057] The second heat pump system 2 includes a second compressor 22, a second heat exchanger 21, a second throttling device 23, and a fourth heat exchanger 24. The second heat exchanger 21, the second throttling device 23, and the fourth heat exchanger 24 are connected in sequence. One of the second heat exchanger 21 and the fourth heat exchanger 24 is communicated with the exhaust port of the second compressor 22, and the other of the second heat exchanger 21 and the fourth heat exchanger 24 is communicated with the suction port of the second compressor 22.

[0058] Among them, the fourth heat exchanger 24 can be arranged in the outdoor environment. Alternatively, the environmental conditioning device may further include an exhaust air duct 02. The exhaust air duct 02 communicates the indoor space with the outdoor environment. An exhaust air fan 32 can be arranged in the exhaust air duct 02. The exhaust air fan 32 can drive the indoor air to be discharged outdoors through the exhaust air duct 02, and the fourth heat exchanger 24 can be arranged in the exhaust air duct 02.

[0059] Furthermore, in some embodiments, in addition to the second heat exchanger 21 and the fourth heat exchanger 24, the second heat pump system 2 may further include at least one sixth heat exchanger. The sixth heat exchanger can be connected in series or in parallel with the second heat exchanger 21. The sixth heat exchanger can be arranged along the air flow direction in the supply air duct 01 with the second heat exchanger 21, or can be arranged along the direction perpendicular to the air flow direction in the supply air duct 01.

[0060] The second heat pump system 2 further includes a second commutation component. The second heat exchanger 21, the fourth heat exchanger 24, the exhaust port of the second compressor 22, and the suction port of the second compressor 22 are all connected to the second commutation component. The operating states of the second commutation component include a third state and a fourth state. When the second commutation component operates in the third state, the exhaust port of the second compressor 22 is communicated with the second heat exchanger 21, and the suction port of the second compressor 22 is communicated with the fourth heat exchanger 24; when the second commutation component operates in the fourth state, the exhaust port of the second compressor 22 is communicated with the fourth heat exchanger 24, and the suction port of the second compressor 22 is communicated with the second heat exchanger 21.

[0061] The operating modes of the second heat pump system 2 may include a third mode and a fourth mode. In the third mode, the second heat exchanger 21 is in a condensing state. In the fourth mode, the second heat exchanger 21 is in an evaporating state.

[0062] When the second commutation component operates in the third state, the exhaust port of the second compressor 22 is communicated with the second heat exchanger 21, and the suction port of the second compressor 22 is communicated with the fourth heat exchanger 24. The refrigerant discharged by the second compressor 22 flows through the second heat exchanger 21, the second throttling device 23, and the fourth heat exchanger 24 in sequence and then returns to the second compressor 22. The second heat exchanger 21 is in a condensing state, the fourth heat exchanger 24 is in an evaporating state, and the second heat pump system 2 is in the third mode.

[0063] When the exhaust port of the second compressor 22 is communicated with the fourth heat exchanger 24 and the suction port of the second compressor 22 is communicated with the second heat exchanger 21, the refrigerant discharged by the second compressor 22 flows through the fourth heat exchanger 24, the second throttling device 23, and the second heat exchanger 21 in sequence and then returns to the second compressor 22. The second heat exchanger 21 is in an evaporating state, the fourth heat exchanger 24 is in a condensing state, and the second heat pump system 2 is in the fourth mode.

[0064] Further, the environmental conditioning device further includes a temperature detection module 3 connected to the control device 100. The temperature detection module 3 is configured to detect a temperature parameter characterizing the condensation temperature in the second heat pump system 2, the temperature of the fluid flowing into the heat exchanger in the condensation state, or the system high-pressure temperature. The temperature detection module 3 may be disposed on the exhaust side of the second heat exchanger 21 and / or the second compressor 22 in the second heat pump system 2.

[0065] In an embodiment of the present invention, referring to Figure 2 , the control device 100 of the environmental conditioning device includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are communicatively connected via a communication bus. The memory 1002 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1002 may also be a storage device independent of the aforementioned processor 1001.

[0066] Those skilled in the art can understand that Figure 2 the device structure shown in

[0067] does not constitute a limitation on the device, and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Figure 2 As shown in

[0068] In Figure 2 the device shown, the processor 1001 may be configured to call the control program of the environmental conditioning device stored in the memory 1002 and perform the relevant step operations of the control method of the environmental conditioning device in the following embodiments.

[0069] An embodiment of the present invention further provides a control method for an environmental conditioning device, which is applied to the above environmental conditioning device.

[0070] Referring to Figure 3 , an embodiment of the control method of the environmental conditioning device of the present application is proposed. In this embodiment, the environmental conditioning device includes a supply air duct, a first heat pump system, and a second heat pump system. The first heat pump system includes a first heat exchanger, and the second heat pump system includes a second heat exchanger. The first heat exchanger and the second heat exchanger are arranged in sequence along the air flow direction in the duct. The control method of the environmental conditioning device includes:

[0071] Step S10, controlling the first heat pump system to operate in a first mode so that the first heat exchanger is in a condensation state, and controlling the second heat pump system to operate in a third mode so that the second heat exchanger is in a condensation state;

[0072] Control the first compressor to start, control the first reversing component to operate in the first state. The exhaust port of the first compressor is connected to the first heat exchanger, and the suction port of the first compressor is connected to the third heat exchanger. The refrigerant discharged by the first compressor flows through the first heat exchanger, the first throttling device, and the third heat exchanger in sequence and then returns to the first compressor. The first heat exchanger is in the condensation state, the third heat exchanger is in the evaporation state, and the first heat pump system is in the first mode.

[0073] Control the second compressor to start, control the second reversing component to operate in the second state. The exhaust port of the second compressor is connected to the second heat exchanger, and the suction port of the second compressor is connected to the fourth heat exchanger. The refrigerant discharged by the second compressor flows through the second heat exchanger, the second throttling device, and the fourth heat exchanger in sequence and then returns to the second compressor. The second heat exchanger is in the condensation state, the fourth heat exchanger is in the evaporation state, and the second heat pump system is in the third mode.

[0074] During the process that the first heat pump system operates in the first mode and the second heat pump system operates in the third mode, the air flows through the first heat exchanger in sequence and the temperature rises. The air with the increased temperature then flows through the second heat exchanger, and the air further heated by the second heat exchanger is sent into the indoor environment.

[0075] Step S20, when the first heat pump system meets the mode switching condition, control the first heat pump system to operate in the second mode and control the compressor in the second heat pump system to operate at a reduced frequency; wherein, the first heat exchanger is in the evaporation state in the second mode.

[0076] The mode switching condition specifically refers to the condition that the first heat pump system needs to meet when switching from the first mode to the second mode. In this embodiment, the mode switching condition includes the defrosting condition. The defrosting condition specifically refers to the condition that the first heat pump system needs to meet when the heat exchanger in the evaporation state in the first heat pump system needs to be defrosted. The defrosting condition may include that the temperature of the heat exchanger in the evaporation state in the first heat pump system is lower than the preset temperature and lasts for the preset duration, and so on. In other embodiments, the mode switching condition may also be receiving a mode switching instruction input by the user, such as a switching instruction from the heating mode to the dehumidification mode, and so on.

[0077] When the first heat pump system needs to switch from the first mode to the second mode, control the first compressor to shut down, control the first reversing component to switch from the first state to the second state, and then control the first compressor to start. At this time, the exhaust port of the first compressor is connected to the third heat exchanger, and the suction port of the first compressor is connected to the first heat exchanger. The refrigerant discharged by the first compressor flows through the third heat exchanger, the first throttling device, and the first heat exchanger in sequence and then returns to the first compressor. The first heat exchanger is in the evaporation state, the third heat exchanger is in the condensation state, and the first heat pump system is in the second mode.

[0078] During the process of the first heat pump system switching from the first mode to the second mode of operation, control the second heat pump system to maintain operation in the third mode, and during the process of the second heat pump system operating in the third mode, control the second compressor to operate at a reduced frequency.

[0079] Here, the frequency adjustment value during the process of the second compressor operating at a reduced frequency can be a preset fixed value or a value determined according to the actual operating conditions of the equipment.

[0080] A control method for an environmental conditioning device proposed in an embodiment of the present invention. The first heat exchanger in the first heat pump system and the second heat exchanger in the second heat pump system in the environmental conditioning device are arranged in sequence along the air flow direction in the air duct. When the heat exchangers upstream and downstream in the air duct are both in the condensation state and the upstream heat pump system meets the mode switching condition, when the upstream heat pump system switches modes and switches the corresponding heat exchanger to the evaporation state, the compressor in the downstream heat pump system operates at a reduced frequency. Based on this, when the air temperature flowing through the downstream heat exchanger drops sharply, the fluctuation of the condensation pressure in the downstream heat pump system can be effectively reduced, the reduction speed of the oil level in the compressor can be effectively slowed down, and the reduction amount of the compressor lubricating oil can be effectively reduced, so as to ensure that there is enough lubricating oil during the operation of the compressor, avoid the compressor lacking oil for a long time, and improve the operation reliability of the compressor.

[0081] Further, based on the above embodiment, another embodiment of the control method for the environmental conditioning device of the present application is proposed. In this embodiment, before the step of controlling the compressor in the second heat pump system to operate at a reduced frequency, it further includes: Figure 4 When the first heat pump system meets the mode switching condition, obtain the state parameter representing the condensation temperature in the second heat pump system in the preset state and / or the operating frequency of the second heat pump system in the preset state, where the preset state is the state before the first heat pump system starts the second mode;

[0082] Step S21, when the first heat pump system meets the mode switching condition, obtain the state parameter representing the condensation temperature in the second heat pump system in the preset state and / or the operating frequency of the second heat pump system in the preset state, where the preset state is the state before the first heat pump system starts the second mode;

[0083] The state parameter and the operating frequency are obtained by real-time detection before the first heat pump system meets the mode switching condition and switches modes.

[0084] The state parameter may include at least one of the following: the coil temperature of the second heat exchanger, the exhaust side temperature of the second compressor, the exhaust side pressure of the second compressor, the condensation pressure of the second heat exchanger, etc.

[0085] Step S22, determine the frequency adjustment value according to the state parameter and / or the operating frequency;

[0086] Different state parameters and / or different operating frequencies correspond to different frequency adjustment values. The frequency adjustment value is positively correlated with the condensation temperature represented by the state parameter, and the frequency adjustment value is positively correlated with the operating frequency.

[0087] Specifically, a correspondence between the state parameter and / or the operating frequency and the frequency adjustment value may be established in advance. The correspondence may include a calculation relationship, a mapping relationship, etc. Based on this correspondence, the frequency adjustment value corresponding to the current state parameter and / or the operating frequency can be determined. For example, the interval where the state parameter and / or the operating frequency is located can be determined, and the frequency adjustment value can be determined according to the determined interval. Another example is that the state parameter and / or the operating frequency can be substituted into a preset formula to calculate the frequency adjustment value here.

[0088] It should be noted that the sequence of execution between the process of determining the frequency value here and the steps of the first heat pump system switching from the first mode to the second mode of operation is not specifically limited.

[0089] The step of controlling the compressor in the second heat pump system to operate at a reduced frequency includes:

[0090] Step S23, controlling the compressor in the second heat pump system to operate at a reduced frequency according to the frequency adjustment value.

[0091] Control the second compressor to reduce the frequency based on the current frequency according to the frequency adjustment value and then maintain the operation at the reduced frequency.

[0092] In this embodiment, during the process of the second heat pump system operating at a reduced frequency, the frequency adjustment value is determined according to the state parameter representing the condensation temperature and / or the operating frequency of the second compressor before the mode switch, which is beneficial to further improving the accuracy of the compressor frequency reduction control, so as to ensure that the mode switch of the first heat pump system will not cause a significant reduction in the lubricating oil of the second compressor, thereby further improving the operating reliability of the second compressor.

[0093] Furthermore, in this embodiment, among the state parameters, there are temperature parameters, and the temperature parameters include the coil temperature of the second heat exchanger or the exhaust side temperature of the second compressor, etc. The frequency adjustment value is determined according to the temperature parameter and the operating frequency; wherein, the frequency adjustment value is positively correlated with the temperature parameter, and the frequency adjustment value is positively correlated with the operating frequency.

[0094] Furthermore, in this embodiment, when the temperature parameter is greater than the first preset temperature, the frequency adjustment value is determined according to the first coefficient and the operating frequency; when the temperature parameter is less than or equal to the first preset temperature and greater than or equal to the second preset temperature, the frequency adjustment value is determined according to the second coefficient and the operating frequency; wherein, the first preset temperature is greater than the second preset temperature, and the first coefficient is greater than the second coefficient. The frequency adjustment value obtained corresponding to the first coefficient is greater than the frequency adjustment value obtained corresponding to the second system.

[0095] The first preset temperature and the second preset temperature can be fixed temperatures set in advance, or can be temperatures determined according to the actual operation conditions of the equipment. For example, the first preset temperature and the second preset temperature here can be determined according to the current temperature difference value between the first heat exchanger and the second heat exchanger and / or the temperature difference value of the first heat exchanger before and after the switching mode of the first heat pump system, etc.

[0096] For example, the temperature parameter is T, the first preset temperature is T1, the second preset temperature is T2, and F is the operating frequency of the second compressor before mode switching. When T is greater than T1, the frequency adjustment value = F*a; when T is in the interval [T1, T2], the frequency adjustment value = F*b. Wherein, a is the first coefficient, b is the second coefficient, and a > b.

[0097] In this embodiment, in the process of determining the frequency adjustment value by combining the temperature parameter and the operating frequency, the frequency adjustment value is positively correlated with the temperature parameter and the operating frequency respectively, so as to ensure that the risk is quickly reduced when the reliability risk of the compressor is large, and unnecessary frequency reduction is reduced when the reliability risk of the compressor is small to ensure the heat exchange efficiency, thereby improving the operating reliability of the second compressor while ensuring the heat exchange efficiency of the second heat pump system.

[0098] Further, in this embodiment, after the step of obtaining the state parameter representing the condensation temperature in the second heat pump system in the preset state and / or the operating frequency of the second heat pump system in the preset state, it further includes: when the temperature parameter is greater than or equal to the second preset temperature, execute the step of determining the frequency adjustment value according to the temperature parameter and the operating frequency.

[0099] The second preset temperature is specifically a critical value for distinguishing whether there is a reliability risk of the second compressor. When the temperature parameter is greater than or equal to the second preset temperature, it indicates that there is a reliability risk of the second compressor. At this time, the operating frequency of the second compressor is adjusted according to the temperature parameter and the operating frequency, thereby effectively improving the operating reliability of the system.

[0100] In other embodiments, when the temperature parameter is less than the second preset temperature, control the first heat pump system to operate in the second mode, and control the compressor in the second heat pump system to maintain the current frequency operation; when the temperature parameter is less than the second preset temperature, it indicates that there is no reliability risk of the second compressor. At this time, the first heat pump system switches to the second mode, but the compressor in the second heat pump system does not reduce the frequency of operation, thereby ensuring the operating reliability of the second compressor while improving the heating output capacity of the second heat pump system.

[0101] Further, in this embodiment, before the step of controlling the first heat pump system to operate in the first mode so that the first heat exchanger is in a condensing state and controlling the second heat pump system to operate in the third mode so that the second heat exchanger is in a condensing state, it further includes: aiming at the target state that the compressor in the second heat pump system reaches when running at the frequency adjustment value for frequency reduction, establishing a preset correspondence relationship among the state parameter, the operating frequency, and the frequency adjustment value; the step of determining the frequency adjustment value according to the state parameter and the operating frequency includes: determining the frequency adjustment value corresponding to the state parameter and the operating frequency according to the preset correspondence relationship; wherein, the target state includes that the oil level height of the compressor in the second heat pump system is greater than or equal to the safe liquid level height when the running duration of the first heat pump system in the switched mode reaches the preset duration.

[0102] The safe liquid level height is specifically the lowest liquid level height allowed for the reliable operation of the second compressor set in advance. The preset duration is specifically the maximum oil shortage duration allowed for the reliable operation of the second compressor.

[0103] Control the first heat pump system to operate in the first mode, control the second heat pump system to operate in the third mode. Among them, the compressor in the second heat pump system operates at the test frequency during the operation of the third mode. Control the first heat pump system to switch to the second mode for operation, control the second compressor to reduce the operating frequency according to the test frequency adjustment value. Monitor the liquid level height of the oil in the second compressor and the state parameter representing the condensing temperature within the preset duration when the first heat pump system operates in the switched mode. When the liquid level height drops below the safe liquid level height and cannot be restored above the safe liquid level height within the preset duration, increase the test frequency adjustment value and then return to execute the steps of controlling the first heat pump system to operate in the first mode, controlling the second heat pump system to operate in the third mode, and the compressor in the second heat pump system operates at the test frequency during the operation of the third mode, until the liquid level height of the oil in the second compressor is greater than or equal to the safe liquid level height when the running duration of the first heat pump system in the switched mode reaches the preset duration, and obtain the effective frequency adjustment value corresponding to the test frequency and the state parameter representing the condensing temperature. Further, determine whether to increase or decrease the current test frequency. After obtaining the new test frequency, return to execute the steps of controlling the first heat pump system to operate in the first mode, controlling the second heat pump system to operate in the third mode, and the compressor in the second heat pump system operates at the test frequency during the operation of the third mode, until reaching the target number of test frequencies, and obtaining multiple correspondence relationships among the state parameter representing the condensing temperature and the effective frequency adjustment values. Determine the preset correspondence relationship according to these multiple correspondence relationships.

[0104] The preset correspondence relationship can include forms such as calculation formulas, mapping relationships, etc.

[0105] In this embodiment, through the above method, it is beneficial to ensure the accuracy of the frequency reduction operation control of the second compressor after the first heat pump system switches its operation mode, and further ensure that the operation reliability of the second heat pump system can be effectively improved after the mode switch of the first heat pump system.

[0106] Further, in this embodiment, after the step of controlling the compressor in the second heat pump system to operate at a reduced frequency according to the frequency adjustment value, the method further includes: when the operation duration of the first heat pump system in the switched mode reaches a preset duration, obtaining the current oil level height of the compressor in the second heat pump system; when the current oil level height is less than the safe liquid level height, determining the height deviation value between the current oil level height and the safe liquid level height; and correcting the preset corresponding relationship according to the height deviation value.

[0107] After the preset corresponding relationship is corrected, when the environmental control device meets the preset conditions, step S10 can be returned to for execution, so that in the process of the next new mode switch, the second compressor can be controlled to reduce its frequency according to the corrected preset corresponding relationship.

[0108] In this embodiment, correcting the preset corresponding relationship in the above manner is beneficial to improving the accuracy of the preset corresponding relationship, so as to improve the accuracy of the frequency reduction control of the second compressor in the process of the subsequent operation mode switch of the first heat pump system, and further improve the operation reliability of the system.

[0109] Further, based on any of the above embodiments, another embodiment of the control method of the environmental control device of the present application is proposed. In this embodiment, after the step of controlling the first heat pump system to operate in the second mode and controlling the compressor in the second heat pump system to operate at a reduced frequency, the method further includes: when the operation of the first heat pump system in the switched mode reaches a preset duration, obtaining the current oil level height of the compressor in the second heat pump system; when the current oil level height is less than the safe liquid level height, controlling the first heat pump system to operate to increase the temperature of the first heat exchanger.

[0110] The preset duration mentioned here is the same concept as the preset duration mentioned in the above embodiment.

[0111] The ways for the first heat pump system to increase the temperature of the first heat exchanger include but are not limited to at least one of the following: reducing the operation frequency of the first compressor, increasing the opening degree of the first throttling device, reducing the operation speed of the fan corresponding to the heat exchanger in the condensation state (such as the third heat exchanger), and so on.

[0112] Specifically, the target control parameter for the first heat pump system to increase the temperature of the first heat exchanger can be determined according to the height deviation value between the current oil level height and the safe liquid level height and the temperature of the heat exchanger in the condensation state. The first heat pump system is controlled to operate according to the target control parameter, so as to ensure the defrosting efficiency of the first heat pump system and the operating reliability of the second heat pump system.

[0113] In this embodiment, when the oil level height of the second compressor cannot be restored above the safe liquid level height within a safe time after the second heat pump system runs at a reduced frequency, the operation of the first heat pump system is adjusted in time to increase the temperature of the first heat exchanger, so as to avoid excessive condensation caused by too low air temperature flowing through the second heat exchanger, resulting in oil shortage of the compressor, and further ensure the effective improvement of the operating reliability of the second heat pump system.

[0114] In addition, an embodiment of the present invention further provides a storage medium, on which a control program for an environmental control device is stored. When the control program for the environmental control device is executed by a processor, the relevant steps of any one of the above embodiments of the control method for the environmental control device are implemented.

[0115] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article or system including the element.

[0116] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments.

[0117] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, 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 is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an environmental control device, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

[0118] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A control method for an environmental conditioning device, characterized in that, The environmental conditioning device includes an air duct, a first heat pump system, and a second heat pump system. The first heat pump system includes a first heat exchanger, and the second heat pump system includes a second heat exchanger. The first heat exchanger and the second heat exchanger are arranged in sequence along the air flow direction in the air duct. The control method of the environmental conditioning device includes the following steps: Control the first heat pump system to operate in a first mode so that the first heat exchanger is in a condensing state, and control the second heat pump system to operate in a third mode so that the second heat exchanger is in a condensing state; When the first heat pump system meets the mode switching condition, control the first heat pump system to operate in a second mode, and control the compressor in the second heat pump system to operate at a reduced frequency; Wherein, the first heat exchanger is in an evaporating state in the second mode.

2. The control method of the environmental regulation device according to claim 1, wherein Before the step of controlling the compressor in the second heat pump system to operate at a reduced frequency, it further includes: When the first heat pump system meets the mode switching condition, obtain the state parameter representing the condensing temperature in the second heat pump system in a preset state and / or the operating frequency of the second heat pump system in the preset state. The preset state is the state before the first heat pump system starts the second mode; Determine a frequency adjustment value according to the state parameter and / or the operating frequency; The step of controlling the compressor in the second heat pump system to operate at a reduced frequency includes: Control the compressor in the second heat pump system to operate at a reduced frequency according to the frequency adjustment value.

3. The control method of the environmental conditioning device according to claim 2, wherein, The state parameter includes a temperature parameter. The step of determining the frequency adjustment value according to the state parameter and the operating frequency includes: Determine the frequency adjustment value according to the temperature parameter and the operating frequency; Wherein, the frequency adjustment value is positively correlated with the temperature parameter, and the frequency adjustment value is positively correlated with the operating frequency.

4. The control method of the environmental conditioning device according to claim 3, characterized in that, The step of determining the frequency adjustment value according to the temperature parameter and the operating frequency includes: When the temperature parameter is greater than a first preset temperature, determine the frequency adjustment value according to a first coefficient and the operating frequency; When the temperature parameter is less than or equal to the first preset temperature and greater than or equal to a second preset temperature, determine the frequency adjustment value according to a second coefficient and the operating frequency; Wherein, the first preset temperature is greater than the second preset temperature, and the first coefficient is greater than the second coefficient.

5. The control method of the environmental conditioning device according to claim 4, characterized in that, After the step of obtaining the state parameter representing the condensing temperature in the second heat pump system in a preset state and / or the operating frequency of the second heat pump system in the preset state, it further includes: When the temperature parameter is greater than or equal to the second preset temperature, execute the step of determining the frequency adjustment value according to the temperature parameter and the operating frequency.

6. The control method of the environmental conditioning device according to claim 2, wherein Before the step of controlling the first heat pump system to operate in a first mode so that the first heat exchanger is in a condensing state, and controlling the second heat pump system to operate in a third mode so that the second heat exchanger is in a condensing state, it further includes: Taking the target that the compressor in the second heat pump system reaches the target state when operating at the frequency adjustment value as the target, a preset correspondence relationship among the state parameters, the operating frequency, and the frequency adjustment value is established; The step of determining the frequency adjustment value according to the state parameter and the operating frequency includes: Determining the frequency adjustment value corresponding to the state parameter and the operating frequency according to the preset correspondence relationship; Wherein, the target state includes that the oil level height of the compressor in the second heat pump system is greater than or equal to the safety liquid level height when the operation duration in the switched mode reaches the preset duration.

7. The control method of the environmental conditioning device according to claim 6, wherein After the step of controlling the compressor in the second heat pump system to operate at a reduced frequency according to the frequency adjustment value, it further includes: When the operation duration of the first heat pump system in the switched mode reaches the preset duration, obtaining the current oil level height of the compressor in the second heat pump system; When the current oil level height is less than the safety liquid level height, determining the height deviation value between the current oil level height and the safety liquid level height; Correcting the preset correspondence relationship according to the height deviation value.

8. The control method of the environmental conditioning device according to any one of claims 1 to 7, characterized in that, After the step of controlling the first heat pump system to operate in the second mode and controlling the compressor in the second heat pump system to operate at a reduced frequency, it further includes: When the operation duration of the first heat pump system in the switched mode reaches the preset duration, obtaining the current oil level height of the compressor in the second heat pump system; When the current oil level height is less than the safety liquid level height, controlling the first heat pump system to operate to increase the temperature of the first heat exchanger.

9. An environmental conditioning device, characterized in that, The environmental conditioning device includes a control device, an air duct, a first heat pump system, and a second heat pump system. The first heat pump system includes a first heat exchanger, and the second heat pump system includes a second heat exchanger. The first heat exchanger and the second heat exchanger are arranged in sequence along the air flow direction in the air duct; Both the first heat pump system and the second heat pump system are connected to the control device. The control device includes: a memory, a processor, and a control program of the environmental conditioning device stored on the memory and executable on the processor. When the control program of the environmental conditioning device is executed by the processor, the steps of the control method of the environmental conditioning device according to any one of claims 1 to 8 are implemented.

10. A storage medium, characterized in that, A control program of the environmental conditioning device is stored on the storage medium. When the control program of the environmental conditioning device is executed by the processor, the steps of the control method of the environmental conditioning device according to any one of claims 1 to 8 are implemented.

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