Control method and control device of air conditioner and air conditioner

Abstract

The invention relates to the technical field of air conditioners, and provides a control method and device of an air conditioner and the air conditioner, and the control method of the air conditioner comprises the steps that in response to a signal for operating a liquid seal prevention shutdown mode, a first signal for controlling the frequency of a compressor to be evenly reduced to a first target frequency within a first preset duration is sent out, a second signal for controlling the opening degree of the liquid seal prevention valve to be uniformly reduced to the target opening degree within the first preset duration is sent out; and after the first preset duration, a third signal for controlling the frequency of the compressor to be adjusted to the second target frequency within the second preset duration is sent out, and a fourth signal for controlling the opening degree of the liquid seal prevention valve to be adjusted to zero within the second preset duration is sent out. When the air conditioner runs in the liquid-seal-preventing shutdown mode, the air conditioner is shut down after the opening degree of the liquid-seal-preventing valve is adjusted to be zero in a staged mode, refrigerants in the refrigerant loop cannot flow back into the outdoor heat exchanger after shutdown, the pressure of the compressor is small when the air conditioner is started again, and high-pressure alarming or faults are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a control method and a control device of an air conditioner and an air conditioner. Background Art

[0002] With the popularization of household appliances, more air conditioners are installed in office buildings or commercial plazas. In order to make the air conditioner cover a wider range, a multi-split system is often used to increase the power of the air conditioning system. In the related art, when the top-outlet multi-split air conditioning system is installed, the indoor unit will be higher than the outdoor unit. Since there is no electronic expansion valve and four-way valve in the single-cooling air conditioning system, when the air conditioner is turned off, the refrigerant in the indoor unit and the long pipe will flow back to the outdoor unit side and flow back to the condenser, resulting in excessive pressure in the condenser. When the air conditioning system is started next time, it will report a high-pressure fault under the action of the refrigerant, which will affect the user's use. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a control method for an air conditioner, when the air conditioner is running in a liquid seal-proof shutdown mode, the opening of the liquid seal-proof valve is adjusted to zero opening in stages and then the air conditioner is shut down. After shutdown, the refrigerant in the refrigerant circuit will not flow back to the outdoor heat exchanger, and the load of the compressor is small when it is restarted, so it can be started normally, avoiding high-pressure alarms or failures, and allowing the air conditioner to run smoothly.

[0004] The invention also provides a control device for an air conditioner.

[0005] The invention also provides an air conditioner.

[0006] According to a first aspect of the present invention, a method for controlling an air conditioner is provided, comprising:

[0007] In response to a signal for running a liquid-proof sealing shutdown mode, obtaining a first target frequency, a second target frequency and a target opening corresponding to the liquid-proof sealing shutdown mode that are pre-stored;

[0008] Sending a first signal to control the frequency of the compressor to be uniformly reduced to a first target frequency within a first preset time length, and sending a second signal to control the opening of the anti-liquid seal valve to be uniformly reduced to a target opening within a first preset time length;

[0009] After the first preset time, a third signal is sent to control the frequency of the compressor to be adjusted to the second target frequency within a second preset time, and a fourth signal is sent to control the opening of the anti-liquid sealing valve to be adjusted to zero opening within the second preset time.

[0010] According to one embodiment of the present invention, the step of obtaining the pre-stored first target frequency, the second target frequency and the target opening corresponding to the liquid-proof sealing shutdown mode further includes:

[0011] Obtain the real-time operating frequency of the compressor and the real-time operating opening of the anti-liquid seal valve;

[0012] The frequency adjustment speed during uniform speed adjustment is determined according to the real-time operating frequency, the first target frequency and the first preset time length, and the opening adjustment speed during uniform speed adjustment is determined according to the real-time operating opening, the target opening and the first preset time length.

[0013] According to an embodiment of the present invention, the ratio of the opening adjustment speed to the frequency adjustment speed is a preset ratio.

[0014] According to one embodiment of the present invention, the method further includes:

[0015] In response to a signal for running the anti-liquid seal startup mode, a fifth signal is sent to control the frequency of the compressor to be adjusted to the first target frequency within the second preset time period, and a sixth signal is sent to control the opening of the anti-liquid seal valve to be adjusted to the target opening within the second preset time period;

[0016] After the second preset time, a seventh signal is sent to control the frequency of the compressor to be adjusted to the target operating frequency within the first preset time, and an eighth signal is sent to control the opening of the anti-liquid sealing valve to be adjusted to the target operating opening within the first preset time.

[0017] According to one embodiment of the present invention, the operation of the anti-liquid seal startup mode includes controlling one or more operation of the anti-liquid seal startup modes in the multi-split outdoor unit.

[0018] According to one embodiment of the present invention, the number of operation of the outdoor unit is obtained by the following steps:

[0019] Obtain the total power and compensation value of the indoor unit to be operated;

[0020] Determine the minimum number of outdoor units to be operated and the operating object according to the total power and the pre-acquired rated power of a single outdoor unit; wherein the anti-liquid seal startup mode includes a pre-startup phase and a stable operation phase;

[0021] In the pre-starting stage, determining the operation number of the outdoor unit according to the minimum operation number and the compensation value;

[0022] In the stable operation stage, the operating number of the outdoor units is the minimum operating number.

[0023] According to a second aspect of the present invention, a control device for an air conditioner is provided, comprising:

[0024] an acquisition module, configured to acquire a first target frequency, a second target frequency and a target opening corresponding to the liquid-proof sealing shutdown mode, which are pre-stored in response to a signal for running the liquid-proof sealing shutdown mode;

[0025] A signal sending module is used to send a first signal to control the frequency of the compressor to be uniformly reduced to a first target frequency within a first preset time period, and to send a second signal to control the opening of the anti-liquid sealing valve to be uniformly reduced to a target opening within the first preset time period; and after the first preset time period, send a third signal to control the frequency of the compressor to be adjusted to a second target frequency within a second preset time period, and send a fourth signal to control the opening of the anti-liquid sealing valve to be adjusted to zero opening within the second preset time period.

[0026] According to a third aspect of the present invention, an air conditioner is provided, comprising:

[0027] A refrigerant circulation loop formed by at least a compressor, an outdoor heat exchanger and an indoor heat exchanger connected in sequence through a refrigerant pipeline;

[0028] An anti-liquid seal valve is arranged on the refrigerant pipeline between the outdoor heat exchanger and the indoor heat exchanger;

[0029] A controller is electrically connected to the compressor and the anti-liquid seal valve, and the controller is configured to, in response to a signal for running the anti-liquid seal shutdown mode, obtain a pre-stored first target frequency, a second target frequency and a target opening corresponding to the anti-liquid seal shutdown mode; and send a first signal to control the frequency of the compressor to be uniformly reduced to the first target frequency within a first preset time, and send a second signal to control the opening of the anti-liquid seal valve to be uniformly reduced to the target opening within the first preset time; and after the first preset time, send a third signal to control the frequency of the compressor to be adjusted to the second target frequency within a second preset time, and send a fourth signal to control the opening of the anti-liquid seal valve to be adjusted to zero opening within the second preset time.

[0030] According to one embodiment of the present invention, the anti-liquid seal valve comprises an electronic expansion valve.

[0031] According to one embodiment of the present invention, it further includes a gas-liquid separator, which is installed on the refrigerant pipeline between the indoor heat exchanger and the compressor.

[0032] The above one or more technical solutions in the present invention have at least one of the following technical effects:

[0033] According to the first aspect of the present invention, the control method of the air conditioner provided by the embodiment includes: in response to the signal of running the anti-liquid seal shutdown mode, obtaining the first target frequency, the second target frequency and the target opening corresponding to the anti-liquid seal shutdown mode stored in advance; sending a first signal to control the frequency of the compressor to be uniformly reduced to the first target frequency in the first preset time, and sending a second signal to control the opening of the anti-liquid seal valve to be uniformly reduced to the target opening in the first preset time; after the first preset time, sending a third signal to control the frequency of the compressor to be adjusted to the second target frequency in the second preset time, and sending a fourth signal to control the opening of the anti-liquid seal valve to be adjusted to zero opening in the second preset time. When the air conditioner runs the anti-liquid seal shutdown mode, the opening of the anti-liquid seal valve is adjusted to zero opening in stages and then shut down. After shutting down, the refrigerant in the refrigerant circuit will not flow back to the outdoor heat exchanger. When the air conditioner is started again, the pressure of the compressor is small, and it can be started normally, avoiding high pressure alarm or failure, so that the air conditioner can run smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic structural diagram of an air conditioner provided in an embodiment of the present invention;

[0036] Figure 2 One of the flow charts of the air conditioner control method provided by the embodiment of the present invention;

[0037] Figure 3 A second flowchart of the air conditioner control method provided by an embodiment of the present invention;

[0038] Figure 4 A schematic structural diagram of a control device for an air conditioner provided in an embodiment of the present invention;

[0039] Figure 5 A schematic structural diagram of an air conditioner provided in an embodiment of the present invention.

[0040] Reference numerals:

[0041] 10. Compressor; 11. Outdoor heat exchanger; 12. Indoor heat exchanger; 13. Anti-liquid seal valve; 14. Gas-liquid separator;

[0042] 401, acquisition module; 402, signal sending module. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the invention clearer, the technical solution in the invention will be clearly described below in conjunction with the drawings in the invention. Obviously, the described embodiments are part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0044] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0045] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0046] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0048] In the related art, when the top-outlet multi-split air conditioning system is installed, the indoor unit will be higher than the outdoor unit. Since there is no electronic expansion valve and four-way valve in the single-cooling air conditioning system, when the air conditioner is turned off, the refrigerant in the indoor unit and the long pipe will flow back to the outdoor unit side and back to the condenser, causing the pressure in the condenser to be too high. When the air conditioning system is started next time, it will report a high-pressure fault under the action of the refrigerant, which will affect the user's use.

[0049] See also Figure 1 The air conditioner provided in the embodiment of the present invention at least includes a compressor 10, an outdoor heat exchanger 11 and an indoor heat exchanger 12. The compressor 10, the outdoor heat exchanger 11 and the indoor heat exchanger 12 are connected in sequence through a refrigerant pipeline to form a refrigerant circulation loop. In this embodiment, if there is a heating demand, a four-way valve can be set; if there is no heating demand, a four-way valve does not need to be set, which can reduce the resistance in the refrigerant circulation loop, reduce the pressure loss in the refrigerant circulation loop, and improve the refrigeration efficiency of the air conditioner.

[0050] See also Figure 1 An anti-liquid seal valve 13 is provided on the refrigerant pipeline between the outdoor heat exchanger 11 and the indoor heat exchanger 12. The opening of the anti-liquid seal valve 13 can be adjusted, and the minimum opening can be adjusted to zero, that is, the anti-liquid seal valve 13 is in a completely closed state.

[0051] The air conditioner also includes a controller, which is electrically connected to the compressor 10 and the anti-liquid sealing valve 13, and is used to control the operating frequency of the compressor 10 and the operating opening of the anti-liquid sealing valve 13, and of course can also control the opening and closing actions of the air conditioner.

[0052] The controller is configured to, in response to a signal for running an anti-liquid seal shutdown mode, obtain a pre-stored first target frequency, a second target frequency and a target opening corresponding to the anti-liquid seal shutdown mode; and send a first signal to control the frequency of the compressor to be uniformly reduced to the first target frequency within a first preset time period, and send a second signal to control the opening of the anti-liquid seal valve to be uniformly reduced to the target opening within a first preset time period; and after the first preset time period, send a third signal to control the frequency of the compressor to be adjusted to the second target frequency within a second preset time period, and send a fourth signal to control the opening of the anti-liquid seal valve to be adjusted to zero opening within the second preset time period.

[0053] When the air conditioner provided by the embodiment of the present invention is running in the anti-liquid seal shutdown mode, the opening of the anti-liquid seal valve is adjusted to zero opening in stages and then shut down. After shutdown, the refrigerant in the refrigerant circuit will not flow back to the outdoor heat exchanger. When the air conditioner is started again, the pressure of the compressor is relatively small and it can be started normally, avoiding high-pressure alarms or failures, and allowing the air conditioner to run smoothly.

[0054] In some embodiments, the anti-liquid sealing valve 13 is an electronic expansion valve, which combines the electronic expansion valve for controlling the refrigerant pressure in the refrigerant circulation loop with the anti-liquid sealing valve 13, thereby reducing the number of components in the system, reducing the cost of the air-conditioning system, and reducing the difficulty of control.

[0055] It is understandable that when the air conditioner is turned off, the electronic expansion valve located on the refrigerant circuit is closed, and the refrigerant in the long pipe between the outdoor heat exchanger and the indoor heat exchanger is blocked in the long pipe by the anti-liquid seal valve 13, and will not flow back into the outdoor heat exchanger 11 under the action of gravity. When the air conditioner is started again, there is not much refrigerant accumulated in the outdoor heat exchanger 11, so the compressor 10 can start normally, avoiding the high pressure alarm or the phenomenon of failure to start due to heavy load.

[0056] In some embodiments, the air conditioner further includes a gas-liquid separator 14 , which is installed on the refrigerant pipeline between the indoor heat exchanger 12 and the compressor 10 .

[0057] See also Figure 1 A gas-liquid separator 14 is installed on the refrigerant pipeline between the indoor heat exchanger 12 and the compressor 10. The indoor heat exchanger 12 exchanges heat with the air in the working area. The refrigerant enters the compressor 10 after heat exchange in the indoor heat exchanger 12, and then performs the next cycle. The gas-liquid separator 14 can prevent liquid refrigerant from entering the compressor 10, avoid liquid hammer in the compressor 10, and reduce the failure of the compressor 10.

[0058] In the air conditioner provided by the embodiment of the present invention, the number of indoor units and outdoor units can be multiple, forming a multi-split air conditioning system. Multiple indoor units are connected in parallel, multiple outdoor units are connected in parallel, and then connected through refrigerant pipelines.

[0059] When the air conditioning system is running, some of the multiple indoor units can be controlled to run, and the number of outdoor units in operation can also be determined according to the number of indoor units. It should be noted that when multiple outdoor units in parallel are started and run, due to the function of the anti-liquid sealing valve 13, the startup process of each outdoor unit is independent and is not interfered by the refrigerant already running in the refrigerant system.

[0060] The control method of the air conditioner provided in the embodiment of the present invention comprises the following steps:

[0061] In response to a signal for running the liquid-proof sealing shutdown mode, a first target frequency, a second target frequency and a target opening degree corresponding to the liquid-proof sealing shutdown mode which are pre-stored are acquired.

[0062] A first signal is sent to control the frequency of the compressor to be uniformly reduced to a first target frequency within a first preset time period, and a second signal is sent to control the opening of the anti-liquid sealing valve to be uniformly reduced to a target opening within a first preset time period.

[0063] After the first preset time, a third signal is sent to control the frequency of the compressor to be adjusted to the second target frequency within the second preset time, and a fourth signal is sent to control the opening of the anti-liquid sealing valve to be adjusted to zero opening within the second preset time.

[0064] It is understandable that in air-conditioning systems with centralized cooling such as shopping malls or office buildings, the shutdown mode can be preset to an anti-liquid seal shutdown mode to prevent the refrigerant in the refrigerant circulation loop from flowing back to the outdoor unit at a lower position under the action of gravity.

[0065] During use, the user can manually operate the remote control or the air conditioner control panel to enter the shutdown mode as needed, thereby generating the liquid-proof shutdown mode; the user can also preset the shutdown time in the system, and actively generate a signal to run the liquid-proof shutdown mode when the preset time is reached.

[0066] The storage module pre-stores data corresponding to the anti-liquid seal shutdown mode, such as the first target frequency, the second target frequency, the target opening, etc. After receiving the instruction to run the anti-liquid seal shutdown mode, the controller directly reads the first target frequency, the second target frequency, the target opening, and then controls the air conditioner to shut down in stages.

[0067] In the first stage, a first signal is sent to control the frequency of the compressor to be uniformly reduced to a first target frequency within a first preset time, and a second signal is sent to control the opening of the anti-liquid sealing valve to be uniformly reduced to a target opening within a first preset time.

[0068] In the first stage, the frequency of the compressor is reduced, the exhaust temperature of the compressor is reduced, and the opening of the anti-liquid seal valve is reduced. At this time, the pressure in the refrigerant circulation circuit increases and the refrigerant temperature rises. The two effects can be offset to avoid rapid changes in the refrigerant state. The frequency of the compressor and the opening of the anti-liquid seal valve are adjusted synchronously, which can make the refrigerant circulation system stable in the first stage. For example, the operating frequency of the compressor is reduced from 105Hz to 50Hz, and the opening of the anti-liquid seal valve is closed from 410 steps to 190 steps.

[0069] In the second stage, the frequency of the compressor is gradually controlled to decrease to the second target frequency, for example, 15Hz. At a low frequency, the compressor can be directly shut down with less impact. At the same time, the opening of the anti-liquid seal valve is adjusted from the target opening to zero opening within the second preset time. At this time, the refrigerant in the refrigerant circulation loop will not flow, and then the compressor can be directly shut down.

[0070] According to the anti-liquid seal shutdown mode provided by the embodiment of the present invention, the refrigerant system can be kept stable in frequency reduction in the first stage, and the compressor frequency can be reduced to a lower frequency in the second stage before shutting down, with less impact force, and the opening of the anti-liquid seal valve is reduced to zero opening, so that the refrigerant in the long pipe between the outdoor heat exchanger and the indoor heat exchanger will not flow back to the outdoor heat exchanger under the action of gravity. When the air conditioner is started again, there is not much refrigerant in the outdoor heat exchanger, the pressure is low at startup, and there will be no high-pressure alarm, so it can start and run smoothly.

[0071] See also Figure 2 The control method of the air conditioner provided by the embodiment of the present invention includes the following process:

[0072] S100, obtaining the current time, and obtaining the pre-stored first target frequency, second target frequency and target opening corresponding to the liquid-proof sealing shutdown mode.

[0073] S110: Determine whether there is a recorded moment.

[0074] If not, execute step S120; if so, execute step S130.

[0075] S120, recording the current time, and sending out a first signal and a second signal.

[0076] S130: Determine whether the duration between the current moment and the recorded moment is greater than a first preset duration.

[0077] If not, execute step S140; if so, execute step S150.

[0078] S140. Send a first signal and a second signal.

[0079] S150: Determine whether the duration between the current moment and the recorded moment is less than or equal to the sum of the first preset duration and the second preset duration.

[0080] If not, execute step S170; if so, execute step S160.

[0081] S160. Send a third signal and a fourth signal.

[0082] S170: Send a shutdown signal.

[0083] It can be understood that the above process is only one implementation method of the air conditioner responding to the signal of running the liquid-proof seal shutdown mode, and other similar processes that can implement the liquid-proof seal shutdown mode are all within the protection scope of the present invention.

[0084] According to one embodiment of the present invention, the step of obtaining the pre-stored first target frequency, the second target frequency and the target opening corresponding to the liquid-proof sealing shutdown mode further includes:

[0085] Obtain the real-time operating frequency of the compressor and the real-time operating opening of the anti-liquid seal valve.

[0086] The frequency adjustment speed during uniform speed adjustment is determined according to the real-time operating frequency, the first target frequency and the first preset duration, and the opening adjustment speed during uniform speed adjustment is determined according to the real-time operating opening, the target opening and the first preset duration.

[0087] It is understandable that when the air-conditioning system is operating normally, the real-time operating opening of the electronic expansion valve and the real-time operating frequency of the compressor are determined as needed. When the anti-liquid seal shutdown mode is determined, the frequency of the compressor and the opening of the anti-liquid seal valve are adjusted synchronously, so that the system can achieve stable frequency reduction. Therefore, the frequency adjustment speed during uniform speed adjustment can be determined according to the real-time operating frequency, the first target frequency and the first preset time, and the opening adjustment speed during uniform speed adjustment can be determined according to the real-time operating opening, the target opening and the first preset time, and then the controller sends a signal to reduce the compressor frequency according to the frequency adjustment speed, and sends a signal to reduce the opening of the anti-liquid seal valve according to the opening adjustment speed.

[0088] See also Figure 3 The control method of the air conditioner provided by the embodiment of the present invention includes the following process:

[0089] S200, obtaining the current time, and obtaining the pre-stored first target frequency, second target frequency, and target opening corresponding to the liquid-proof sealing shutdown mode.

[0090] S201. Obtain the real-time operating frequency of the compressor and the real-time operating opening of the anti-liquid seal valve.

[0091] S202, determining the frequency adjustment speed during uniform speed adjustment according to the real-time operating frequency, the first target frequency and the first preset duration, and determining the opening adjustment speed during uniform speed adjustment according to the real-time operating opening, the target opening and the first preset duration.

[0092] S210: Determine whether there is a recorded moment.

[0093] If not, execute step S220; if so, execute step S230.

[0094] S220, recording the current time, and sending a signal to reduce the frequency of the compressor according to the frequency adjustment speed, and sending a signal to reduce the opening of the anti-liquid sealing valve according to the opening adjustment speed.

[0095] S230: Determine whether the duration between the current moment and the recorded moment is greater than a first preset duration.

[0096] If not, execute step S240; if so, execute step S250.

[0097] S240, sending a signal to reduce the frequency of the compressor according to the frequency adjustment speed, and sending a signal to reduce the opening of the anti-liquid seal valve according to the opening adjustment speed.

[0098] S250: Determine whether the duration between the current moment and the recorded moment is less than or equal to the sum of the first preset duration and the second preset duration.

[0099] If not, execute step S270; if so, execute step S260.

[0100] S260. Send a third signal and a fourth signal.

[0101] S270: Send a shutdown signal.

[0102] In some embodiments, the ratio of the opening adjustment speed to the frequency adjustment speed is a preset ratio.

[0103] It can be understood that, for example, if the real-time operating frequency is 105Hz and the first target frequency is 50Hz, then within the first preset time, for example, 2-3 minutes, it is evenly reduced by 55Hz; the real-time operating opening is 410 steps, and it is adjusted to 190 steps within the first preset time, evenly reduced by 220 steps, then for every adjustment of 1Hz, the opening is reduced by 4 steps, that is, the ratio of the opening adjustment speed to the frequency adjustment speed is the preset ratio, and when the ratio is within the preset ratio, the refrigerant system operates more stably. The preset ratio can be a certain range, for example, between 3 and 5. When the ratio of the opening adjustment speed to the frequency adjustment speed exceeds the range, it needs to be corrected so that the corrected ratio meets the preset ratio.

[0104] According to the air conditioner control method provided by the embodiment of the present invention, after running the anti-liquid seal mode, the refrigerant in the long pipe between the outdoor heat exchanger and the indoor heat exchanger is blocked by the anti-liquid seal valve, which will not affect the start-up of the compressor, thereby avoiding the high-pressure alarm when the compressor starts.

[0105] According to one embodiment of the present invention, the air conditioner control method further includes:

[0106] In response to the signal of running the anti-liquid seal startup mode, a fifth signal is sent to control the frequency of the compressor to be adjusted to the first target frequency within a second preset time period, and a sixth signal is sent to control the opening of the anti-liquid seal valve to be adjusted to the target opening within the second preset time period.

[0107] After the second preset time, a seventh signal is sent to control the frequency of the compressor to be adjusted to the target operating frequency within the first preset time, and an eighth signal is sent to control the opening of the anti-liquid sealing valve to be adjusted to the target operating opening within the first preset time.

[0108] It is understandable that after the air conditioner runs the anti-liquid seal shutdown mode, it is still necessary to consider the problem of refrigerant reflux or the impact of the refrigerant system on the newly turned on outdoor unit before starting it again, and the anti-liquid seal startup mode needs to be run when starting the machine.

[0109] When the air conditioner runs in the anti-liquid seal startup mode, it is also divided into two stages:

[0110] In the first stage, the frequency of the compressor is controlled to be adjusted to the first target frequency within the second preset time, for example, from 15Hz to 50Hz within 1 minute. The frequency of the compressor is low when it starts, which reduces the load at startup and is conducive to the smooth startup of the compressor. At the same time, the opening of the anti-liquid seal valve is adjusted from zero opening to the target opening, for example, from 0 steps to 190 steps. The anti-liquid seal valve is opened slowly to prevent the refrigerant pressure in the refrigerant system from being transmitted to the compressor during the startup phase, which is conducive to the smooth startup of the compressor.

[0111] In the second stage, the frequency of the compressor is stably increased to the operating frequency, for example, adjusted to 105Hz, and the opening of the anti-liquid seal valve is stably opened to the operating opening, for example, 410 steps, and the ratio of the opening adjustment speed to the frequency adjustment speed is a preset ratio.

[0112] According to one embodiment of the present invention, running the anti-liquid seal startup mode includes controlling one or more anti-liquid seal startup modes in the multi-split outdoor unit.

[0113] It can be understood that the air-conditioning system includes multiple indoor units and multiple outdoor units. Different indoor units cover different working areas. During operation, some of the multiple indoor units can be started as needed. At this time, the number of outdoor units started can be determined according to the number of indoor units. Therefore, running the anti-liquid seal start-up mode includes controlling one or more of the multi-split outdoor units to run the anti-liquid seal start-up mode.

[0114] According to one embodiment of the present invention, the number of outdoor units in operation is obtained by the following steps:

[0115] Get the total power and compensation value of the indoor unit to be operated.

[0116] The minimum number of outdoor units in operation and the operating objects are determined according to the total power and the pre-acquired rated power of a single outdoor unit; wherein the anti-liquid seal startup mode includes a pre-startup phase and a stable operation phase.

[0117] In the pre-start phase, the number of outdoor unit operations is determined based on the minimum number of operations and the compensation value.

[0118] In the stable operation stage, the number of outdoor units in operation is the minimum number.

[0119] It is understandable that in a shopping mall or office building, the number of indoor units and the total power of multiple indoor units can be determined as needed. In order for the outdoor unit to meet the needs of the indoor unit and overcome the pressure loss in the long pipe, the power of the outdoor unit needs to be greater than the total power of the indoor unit.

[0120] The minimum number of outdoor units to be operated is determined based on the total power and the pre-acquired rated power of a single outdoor unit. For example, if the total power of the indoor units is 5 kilowatts and the power of a single outdoor unit is 3 kilowatts, at least two outdoor units are required. When there are many outdoor units, different outdoor units can be numbered so that different outdoor units can be operated in turn according to the working hours of each outdoor unit. For example, outdoor units No. 1 and No. 2 were operated last time, and outdoor units No. 3 and No. 4 are selected to operate this time.

[0121] In order to make the air conditioner run smoothly in the pre-start stage, the number of outdoor units can be increased. For example, one outdoor unit can be added on the basis of the minimum operating number as an outdoor unit to overcome the system pressure and height difference. The compensation value is determined according to the system pressure and the height difference between the outdoor unit and the indoor unit, and can be 1, 2, 3, etc.

[0122] During the stable operation stage, a minimum number of outdoor units can be operated to achieve energy saving effects.

[0123] According to the second aspect of the present invention, the control device of the air conditioner is provided. Figure 4 ,include:

[0124] The acquisition module 401 is used to respond to the signal of running the liquid-proof sealing shutdown mode and acquire the pre-stored first target frequency, second target frequency and target opening corresponding to the liquid-proof sealing shutdown mode.

[0125] The signal sending module 402 is used to send a first signal to control the frequency of the compressor to be uniformly reduced to a first target frequency within a first preset time period, and to send a second signal to control the opening of the anti-liquid sealing valve to be uniformly reduced to a target opening within the first preset time period; and after the first preset time period, send a third signal to control the frequency of the compressor to be adjusted to a second target frequency within a second preset time period, and send a fourth signal to control the opening of the anti-liquid sealing valve to be adjusted to zero opening within the second preset time period.

[0126] It should be noted that the above steps S100 to S170, and other steps are only for the convenience of expression, and do not constitute a time sequence limitation for each step in the air conditioner control method. In addition, some contents are described in detail in the air conditioner control method provided in the first aspect embodiment, and the contents in all air conditioner control methods are also applicable to the air conditioner control device provided in the second aspect embodiment, and in order to avoid repetition, the air conditioner control device provided in the second aspect embodiment is not described in detail. Similarly, the contents in the above two aspects of the embodiments can be used to explain the contents of all the following aspects of the embodiments, so the repeated contents will not be repeated in the following embodiments. The control device of the air conditioner provided according to the embodiment of the present invention has a technical effect corresponding to the technical effect of the above-mentioned air conditioner control method, which will not be repeated here.

[0127] An air conditioner provided according to an embodiment of the third aspect of the present invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the air conditioner control method provided according to the embodiment of the first aspect of the present invention are implemented.

[0128] Figure 5The schematic diagram of the physical structure of an air conditioner is illustrated, and the air conditioner may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute a control method of the air conditioner, and the method includes: in response to a signal of running the anti-liquid seal shutdown mode, obtaining a first target frequency, a second target frequency and a target opening corresponding to the anti-liquid seal shutdown mode stored in advance; sending a first signal to control the frequency of the compressor to be uniformly reduced to the first target frequency in a first preset time length, and sending a second signal to control the opening of the anti-liquid seal valve to be uniformly reduced to the target opening in the first preset time length; and after the first preset time length, sending a third signal to control the frequency of the compressor to be adjusted to the second target frequency in a second preset time length, and sending a fourth signal to control the opening of the anti-liquid seal valve to be adjusted to zero opening in the second preset time length.

[0129] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0130] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0131] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0132] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: include: In response to a signal for running a liquid-proof sealing shutdown mode, obtaining a first target frequency, a second target frequency and a target opening corresponding to the liquid-proof sealing shutdown mode that are pre-stored; Sending a first signal to control the frequency of the compressor to be uniformly reduced to a first target frequency within a first preset time length, and sending a second signal to control the opening of the anti-liquid seal valve to be uniformly reduced to a target opening within a first preset time length; After the first preset time, a third signal is sent to control the frequency of the compressor to be adjusted to the second target frequency within a second preset time, and a fourth signal is sent to control the opening of the anti-liquid sealing valve to be adjusted to zero opening within the second preset time.

2. The air conditioner control method according to claim 1, characterized in that: The step of obtaining the pre-stored first target frequency, second target frequency and target opening corresponding to the liquid-proof sealing shutdown mode further includes: Obtain the real-time operating frequency of the compressor and the real-time operating opening of the anti-liquid seal valve; The frequency adjustment speed during uniform speed adjustment is determined according to the real-time operating frequency, the first target frequency and the first preset time, and the opening adjustment speed during uniform speed adjustment is determined according to the real-time operating opening, the target opening and the first preset time.

3. The air conditioner control method according to claim 2, characterized in that: The ratio of the opening adjustment speed to the frequency adjustment speed is a preset ratio.

4. The air conditioner control method according to any one of claims 1 to 3, characterized in that: The method further comprises: In response to a signal for running the anti-liquid seal startup mode, a fifth signal is sent to control the frequency of the compressor to be adjusted to the first target frequency within the second preset time period, and a sixth signal is sent to control the opening of the anti-liquid seal valve to be adjusted to the target opening within the second preset time period; After the second preset time, a seventh signal is sent to control the frequency of the compressor to be adjusted to the target operating frequency within the first preset time, and an eighth signal is sent to control the opening of the anti-liquid sealing valve to be adjusted to the target operating opening within the first preset time.

5. The air conditioner control method according to claim 4, characterized in that: The running anti-liquid seal startup mode includes controlling one or more running anti-liquid seal startup modes in the multi-split outdoor unit.

6. The air conditioner control method according to claim 5, characterized in that: The number of outdoor units in operation is obtained by the following steps: Obtain the total power and compensation value of the indoor unit to be operated; Determine the minimum number of outdoor units to be operated and the operating object according to the total power and the pre-acquired rated power of a single outdoor unit; wherein the anti-liquid seal startup mode includes a pre-startup phase and a stable operation phase; In the pre-starting stage, determining the operation number of the outdoor unit according to the minimum operation number and the compensation value; In the stable operation stage, the operating number of the outdoor units is the minimum operating number.

7. A control device for an air conditioner, characterized in that: include: an acquisition module, configured to acquire a pre-stored first target frequency, a second target frequency and a target opening corresponding to the liquid-proof sealing shutdown mode in response to a signal for running the liquid-proof sealing shutdown mode; A signal sending module is used to send a first signal to control the frequency of the compressor to be uniformly reduced to a first target frequency within a first preset time period, and to send a second signal to control the opening of the anti-liquid sealing valve to be uniformly reduced to a target opening within the first preset time period; and after the first preset time period, send a third signal to control the frequency of the compressor to be adjusted to a second target frequency within a second preset time period, and send a fourth signal to control the opening of the anti-liquid sealing valve to be adjusted to zero opening within the second preset time period.

8. An air conditioner, characterized in that: include: A refrigerant circulation loop formed by at least a compressor, an outdoor heat exchanger and an indoor heat exchanger connected in sequence through a refrigerant pipeline; An anti-liquid seal valve is arranged on the refrigerant pipeline between the outdoor heat exchanger and the indoor heat exchanger; A controller is electrically connected to the compressor and the anti-liquid seal valve, and the controller is configured to, in response to a signal for running the anti-liquid seal shutdown mode, obtain a pre-stored first target frequency, a second target frequency and a target opening corresponding to the anti-liquid seal shutdown mode; and send a first signal to control the frequency of the compressor to be uniformly reduced to the first target frequency within a first preset time, and send a second signal to control the opening of the anti-liquid seal valve to be uniformly reduced to the target opening within the first preset time; and after the first preset time, send a third signal to control the frequency of the compressor to be adjusted to the second target frequency within a second preset time, and send a fourth signal to control the opening of the anti-liquid seal valve to be adjusted to zero opening within the second preset time.

9. The air conditioner according to claim 8, characterized in that: The anti-liquid seal valve comprises an electronic expansion valve.

10. The air conditioner according to claim 8, characterized in that: It also includes a gas-liquid separator, which is installed on the refrigerant pipeline between the indoor heat exchanger and the compressor.

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