Method, device and equipment for reducing free-flow sound of a free-flow dispensing type and medium

Abstract

The application discloses a control method, device and equipment for reducing free matching type liquid flow sound and a medium, and the method comprises the following steps: in response to an operation instruction, determining whether the air conditioning system is currently in a preset mode to obtain a first determination result; if the first determination result is yes, determining whether the air conditioning system is in a preset open quantity state to obtain a second determination result; if the second determination result is yes, acquiring the inlet pipe temperature and the outlet pipe temperature of an indoor heat exchanger; determining whether the air conditioning system is in a first gear to obtain a third determination result; if the third determination result is yes, determining whether the inlet pipe temperature is greater than or equal to the outlet pipe temperature to obtain a fourth determination result; and if the fourth determination result is yes, reducing the opening degree of a throttling device according to a preset first adjustment strategy. While avoiding liquid flow sound, the compressor and the outdoor fan can be maintained in low frequency and low speed operation, which is more energy-saving and power-saving, and therefore, the air conditioning system applying the method belongs to an energy-saving air conditioner.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a control method, device, equipment and medium for reducing liquid flow noise in free-flow models. Background Technology

[0002] As living standards improve, people have increasingly higher requirements for the quality of household air conditioners. Noise has also become one of the important indicators for people to measure the quality of air conditioning products. Silent design has gradually become the norm. However, while silent design reduces noise levels, it also brings other noise problems that were previously masked by airflow noise, such as liquid flow noise.

[0003] A customizable system typically connects a single outdoor unit to multiple indoor terminals, allowing for precise adjustment of refrigerant flow to each indoor terminal based on the actual load requirements of each room, thus achieving personalized temperature control. However, in actual operation, especially under partial load conditions where only one or a few indoor units are running, customizable systems face significant technical challenges.

[0004] When a variable frequency air conditioner is running in cooling or dehumidification mode, if one or two indoor units are turned on, the actual amount of refrigerant circulating through the system is too large. This makes it impossible to effectively balance the liquid supply and evaporation demand, resulting in a two-phase state of gas and liquid after the system is throttled. When the two-phase flow enters the evaporator of the indoor unit, it encounters bends and changes in cross-section in the pipeline, causing the fluid direction to change. The changing two-phase flow will produce severe liquid flow impact and turbulence, generating uncomfortable liquid flow noise.

[0005] The solution proposed in patent CN115479354A is to "obtain the current temperature and current pressure of the refrigerant after throttling; determine the saturated liquid temperature of the refrigerant based on the current pressure of the refrigerant; if the current temperature of the refrigerant is detected to be greater than the saturated liquid temperature, control the outdoor fan to increase its speed and / or the compressor to increase its operating frequency." The solution proposed in patent CN116792909A is: "When the indoor unit of a multi-split air conditioner has a reheat requirement, and the refrigerant pressure from the outdoor unit compressor is greater than a preset pressure threshold, the subcooling of the refrigerant at the outdoor unit outlet pipe is detected. If the subcooling of the refrigerant is too small, it indicates that the fan speed of the outdoor unit is too low, i.e., it is overly satisfying the reheat requirement, which may cause the refrigerant in the indoor unit inlet pipe to be in a two-phase state of gas and liquid, resulting in liquid flow noise. Therefore, the fan speed of the outdoor unit is increased to increase the subcooling of the refrigerant at the outdoor unit outlet pipe, thereby eliminating the two-phase state of gas and liquid and eliminating liquid flow noise." However, all of the above patents have the following problems: Firstly, under low load conditions, increasing the air conditioner's operating frequency or the outdoor fan speed will rapidly increase the air conditioner's capacity, and the room temperature will quickly approach the set temperature. At this time, the compressor frequency and the outdoor fan speed will continue to decrease, reducing the subcooling, which may produce liquid flow noise. This repeated rise and fall of the compressor frequency or the outdoor fan speed will cause the air conditioner to have liquid flow noise for a period of time and not have liquid flow noise for a period of time, which cannot completely solve the liquid flow noise problem.

[0006] Secondly, under low load conditions, increasing the compressor frequency or outdoor fan speed will improve the air conditioning capacity, and the room temperature will quickly reach the set temperature. The air conditioner is prone to stopping when it reaches the set temperature, causing the compressor to start and stop frequently, which affects the reliability of the compressor. Moreover, the sudden changes in temperature are not good for comfort.

[0007] Third, increasing the compressor's operating frequency or the outdoor fan's speed will increase the noise level of the outdoor unit, reduce comfort, and increase power consumption, thus being energy-inefficient. Summary of the Invention

[0008] This invention provides a control method, device, equipment, and medium for reducing liquid flow noise in air conditioners with flexible configurations. It aims to solve the problem in existing technologies where increasing the compressor frequency or the outdoor fan speed is required to reduce liquid flow noise under low load conditions.

[0009] In a first aspect, embodiments of the present invention provide a control method for reducing liquid flow noise in a freely adjustable air conditioning system, applied to an air conditioning system, the air conditioning system including an outdoor unit and multiple indoor units connected in parallel, each indoor unit including an indoor heat exchanger and a throttling device disposed between the indoor heat exchanger and the outdoor unit; the control method includes: In response to the operation command, determine whether the air conditioning system is currently in a preset mode and obtain the first determination result; If the first judgment result is yes, determine whether the air conditioning system is in the preset number of open states, and obtain the second judgment result; If the second determination result is yes, obtain the inlet pipe temperature and outlet pipe temperature of the indoor heat exchanger; Determine whether the air conditioning system's fan speed is in the first position to obtain a third judgment result. The first position includes silent mode or low fan speed. If the third judgment result is yes, then determine whether the inlet pipe temperature is greater than or equal to the outlet pipe temperature to obtain the fourth judgment result; If the fourth judgment result is yes, the opening degree of the throttling device is reduced according to the preset first adjustment strategy.

[0010] In some embodiments, the preset number of opening states includes a single-open state and a double-open state; reducing the opening degree of the throttling device according to a preset first adjustment strategy includes: Determine whether the air conditioning system is in a single-on or double-on state, and obtain the state determination result. Different state results correspond to different adjustment parameters. The opening degree of the throttling device is reduced to the first opening value corresponding to the state determination result; Determine the relationship between the difference between the inlet pipe temperature and the outlet pipe temperature and the first temperature threshold and the second temperature threshold; If the difference is between the first temperature threshold and the second temperature threshold, the opening of the throttling device is further reduced at a first rate, where the value of the first rate is equal to the product of the first constant corresponding to the state determination result and the difference. If the difference is greater than the second temperature threshold, the opening of the throttling device is further reduced at a second rate, the value of which is equal to the product of the second constant corresponding to the state determination result and the difference. Wherein, the second constant is greater than the first constant.

[0011] In some embodiments, if the second determination result is yes, after obtaining the inlet pipe temperature and outlet pipe temperature of the indoor heat exchanger, the method further includes: The system determines whether the air conditioning system is in the process of switching from other gears to the first gear, and obtains a fifth determination result, wherein the other gear is a higher gear than the first gear; If the fifth judgment result is yes, the opening degree of the throttling device is reduced according to the preset second adjustment strategy.

[0012] In some embodiments, reducing the opening of the throttling device according to a preset second adjustment strategy includes: The opening degree of the throttling device is reduced to the second opening value corresponding to the state determination result; Determine the relationship between the difference between the inlet pipe temperature and the outlet pipe temperature and the first temperature threshold and the second temperature threshold; If the difference is between the first temperature threshold and the second temperature threshold, the opening of the throttling device is further reduced at the first rate. If the difference is greater than the second temperature threshold, the opening of the throttling device is further reduced at the second rate.

[0013] In some embodiments, the second opening value corresponding to the double-open state is less than the second opening value corresponding to the single-open state.

[0014] In some embodiments, the first opening value corresponding to the double-open state is less than the first opening value corresponding to the single-open state.

[0015] In some embodiments, the first constant corresponding to the single-open state is greater than the first constant corresponding to the double-open state; the second constant corresponding to the single-open state is greater than the second constant corresponding to the double-open state.

[0016] In a second aspect, embodiments of the present invention provide a control device for reducing fluid flow noise in free-flowing models, used to execute the control method described in the first aspect, the control device comprising: The first judgment unit is used to respond to the operation command, determine whether the air conditioning system is currently in a preset mode, and obtain the first judgment result; The second judgment unit, if the first judgment result is yes, determines whether the air conditioning system is in a preset number of open states, and obtains the second judgment result; A temperature acquisition unit is used to acquire the inlet pipe temperature and outlet pipe temperature of the indoor heat exchanger if the second judgment result is yes. The third judgment unit determines whether the air conditioning system's fan speed is in the first position and obtains a third judgment result. The first position includes silent mode or low fan speed. The fourth judgment unit is used to determine whether the inlet pipe temperature is greater than or equal to the outlet pipe temperature if the third judgment result is yes, and to obtain the fourth judgment result; The first adjustment unit is used to reduce the opening of the throttling device according to a preset first adjustment strategy if the fourth judgment result is yes.

[0017] Thirdly, embodiments of the present invention provide a computer device, the device including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; When the processor executes a program stored in the memory, it implements the steps of the control method for reducing the flow noise of the free-flowing machine as described in the first aspect.

[0018] Fourthly, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the control method for reducing fluid flow noise in a free-flowing machine as described in the first aspect.

[0019] This invention provides a control method, apparatus, device, and medium for reducing liquid flow noise in a freely adjustable air conditioning system. The control method is applied to an air conditioning system, which includes an outdoor unit and multiple indoor units connected in parallel. Each indoor unit includes an indoor heat exchanger and a throttling device disposed between the indoor heat exchanger and the outdoor unit. The control method includes: responding to an operating command, determining whether the air conditioning system is currently in a preset mode to obtain a first determination result; if the first determination result is yes, determining whether the air conditioning system is in a preset number of open states to obtain a second determination result; if the second determination result is yes, acquiring the inlet pipe temperature and outlet pipe temperature of the indoor heat exchanger; determining whether the fan speed of the air conditioning system is in a first setting to obtain a third determination result, where the first setting includes a silent setting or a low fan speed; if the third determination result is yes, determining whether the inlet pipe temperature is greater than or equal to the outlet pipe temperature to obtain a fourth determination result; if the fourth determination result is yes, reducing the opening degree of the throttling device according to a preset first adjustment strategy. According to the first adjustment strategy, the opening degree of the throttling device corresponding to the evaporator is reduced. By reducing the opening degree of the throttling device, the rate at which the refrigerant enters the evaporator is reduced, so as to avoid the heat exchange rate of the evaporator being unable to keep up with the flow rate of the refrigerant. This allows the evaporator to exchange heat fully, avoids the enrichment of gas and liquid two-phase states, and eliminates the need to increase the compressor frequency or the speed of the external fan, thus solving the problem of liquid flow noise that is easy to be generated in the evaporator. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A flowchart of a control method for reducing fluid flow noise in a free-flowing engine is provided for embodiments of the present invention; Figure 2 A schematic diagram of the structure of an air conditioning system to which the control method for reducing fluid flow noise in a free-flowing model is applied, as provided in this embodiment of the invention; Figure 3 A flowchart of a control method for reducing fluid flow noise in a free-flowing engine is provided for embodiments of the present invention; Figure 4 A sub-flowchart of a control method for reducing fluid flow noise in a free-flowing engine, as provided in this embodiment of the invention; Figure 5 A sub-flowchart of a control method for reducing fluid flow noise in a free-flowing engine, as provided in this embodiment of the invention; Figure 6 A schematic block diagram of a control device for reducing fluid flow noise in a free-flowing machine, provided in an embodiment of the present invention; Figure 7 A schematic block diagram of a computer device provided for an embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0024] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0025] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0026] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0027] Please see Figure 1 and Figure 2 As shown in the figure, this embodiment of the invention provides a control method for reducing liquid flow noise in freely adjustable air conditioning units. While avoiding liquid flow noise, it allows the compressor and outdoor fan to operate at low frequency and low speed, resulting in greater energy savings. Therefore, the air conditioning system using this method is an energy-saving air conditioner. The control method for reducing liquid flow noise in freely adjustable air conditioning units is applied to such systems, which include one outdoor unit and multiple indoor units connected in parallel. Each indoor unit includes an indoor heat exchanger and a throttling device located between the indoor heat exchanger and the outdoor unit. Figure 2 For example, there are four parallel indoor heat exchangers and four corresponding throttling devices, which can be electronic expansion valves. In cooling mode, the outdoor heat exchanger acts as a condenser, and the indoor heat exchangers act as evaporators. The low-temperature refrigerant discharged from the condenser flows into the evaporator through the throttling devices to cool the indoor environment.

[0028] The control method includes: S1. In response to the operation command, determine whether the air conditioning system is currently in the preset mode and obtain the first judgment result.

[0029] In this embodiment, the operation command can be sent by the user to the air conditioning system via a remote control. The operation command can be a power-on command from power off to power on, or a switching command to switch between various modes or parameters.

[0030] The operating instructions may include the air conditioning system's operating mode, the number of indoor units to be turned on, and the operating temperature. Operating modes include cooling mode, dehumidification mode, and heating mode. The number of indoor units to be turned on includes single-unit, double-unit, and full-unit operation. In this embodiment, the preset mode is cooling mode. That is, it determines whether the air conditioning system is in cooling mode (dehumidification mode is essentially a low-speed cooling mode) and obtains the first determination result.

[0031] S2. If the first judgment result is yes, determine whether the air conditioning system is in the preset number of open states, and obtain the second judgment result.

[0032] In this embodiment, since the air conditioning system of the free-configuration type has multiple indoor units connected in parallel, when one or two indoor units are turned on, the refrigerant in the air conditioning system itself is relatively large. At this time, the refrigerant in the evaporator of one or two indoor units will definitely become rich in the gas-liquid two-phase state due to the slow heat exchange of the evaporator and the large amount of refrigerant, which can easily generate liquid flow noise in the evaporator.

[0033] Therefore, if the air conditioning system is in cooling mode, it is further determined whether it is in a preset number of operating states. The number of operating states of the air conditioning system includes single-on, double-on, and fully-on states (corresponding to different numbers of indoor units being turned on). In this embodiment, the preset number of operating states include single-on and double-on states, that is, it is further determined whether the air conditioning system is in a single-on or double-on state, so as to solve the problem of liquid flow noise that is prone to occur when the air conditioning system is in a single-on or double-on state through subsequent control methods.

[0034] S3. If the second judgment result is yes, obtain the inlet pipe temperature and outlet pipe temperature of the indoor heat exchanger.

[0035] In this embodiment, if the air conditioning system is in a single-on or double-on state, the inlet and outlet pipe temperatures of the activated indoor heat exchanger are obtained. (See also...) Figure 1 The inlet pipe temperature is the temperature of the pipe at the end of the evaporator closest to the throttling device, while the outlet pipe temperature is the temperature at the other end of the evaporator. By obtaining the inlet and outlet pipe temperatures, the phase state of the refrigerant in the evaporator can be further and directly determined, such as whether it is in a gaseous state or a gas-liquid mixture, thus more accurately determining whether there is a possibility of liquid flow noise.

[0036] S4a. Determine whether the air conditioning system's fan speed is in the first position and obtain a third determination result. The first position includes silent mode or low fan speed.

[0037] In this embodiment, on the one hand, when the air conditioning system is under low load, i.e., at the first setting, the heat exchange efficiency of the indoor heat exchanger is low. Furthermore, S3 confirms that the air conditioning system is in single-operation or double-operation mode, making it easier for the refrigerant in the evaporator to accumulate in a two-phase state, generating liquid flow noise. On the other hand, this embodiment aims to solve the problem in the prior art where increasing the compressor frequency or outdoor fan speed is required to address liquid flow noise under low load conditions. Therefore, determining whether the air conditioning system's fan speed is in a silent or low setting, i.e., determining whether the user's current air conditioning demand is low load, is crucial for the next control step.

[0038] S5a. If the third judgment result is yes, determine whether the inlet pipe temperature is greater than or equal to the outlet pipe temperature to obtain the fourth judgment result.

[0039] S6a. If the fourth judgment result is yes, reduce the opening degree of the throttling device according to the preset first adjustment strategy.

[0040] In this embodiment, if the air conditioning system's fan speed is at the first setting, it is determined whether the inlet pipe temperature of the indoor evaporator is greater than or equal to the outlet pipe temperature. Since the refrigerant's entry and exit from the evaporator is a process of liquid absorbing heat and evaporating into a gaseous state, under normal circumstances, the evaporator's inlet pipe temperature is lower than the outlet pipe temperature. If the fourth determination result is yes, meaning the evaporator's inlet pipe temperature is greater than or equal to the outlet pipe temperature, it indicates that there is still unevaporated liquid refrigerant at the evaporator outlet. This means the current air conditioning system is in a multi-refrigerant state, leading to the accumulation of gas-liquid two-phase states, which easily generates liquid flow noise within the evaporator. Therefore, this embodiment reduces the opening degree of the throttling device corresponding to the activated evaporator according to the first adjustment strategy. By reducing the opening degree of the throttling device, the rate at which the refrigerant enters the evaporator is reduced, preventing the evaporator's heat exchange rate from failing to keep up with the refrigerant's flow rate. This allows the evaporator to fully exchange heat, avoiding the accumulation of gas-liquid two-phase states, eliminating the need to increase the compressor frequency or the outdoor fan speed, and solving the problem of liquid flow noise easily generated within the evaporator.

[0041] See also Figure 4 In some embodiments, reducing the opening of the throttling device according to a preset first adjustment strategy includes: S6a1. Determine whether the air conditioning system is in a single-on or double-on state, and obtain the state determination result. Different state results correspond to different adjustment parameters.

[0042] In this embodiment, the state determination result is either a single-on or double-on state. Considering that the amount of refrigerant in the system is relatively different in the single-on and double-on states, before performing any specific adjustment operations, it is determined whether the air conditioning system is in a single-on or double-on state. Different adjustment parameters are selected based on different state determination results, thereby specifically adjusting the throttling device to regulate the refrigerant flow. This solves the liquid flow noise problem while avoiding the impact of a single adjustment method on the normal operation of the air conditioning system and thus affecting the user experience.

[0043] The adjustment parameters include a first opening value, a first constant, a second constant, and a second opening value. For ease of understanding, the specific effects of these adjustment parameters are described in the following embodiments.

[0044] S6a2, reduce the opening degree of the throttling device to the first opening degree value corresponding to the state determination result.

[0045] In this example, since the fourth judgment result is already obtained (i.e., it is determined that there is relatively more refrigerant and liquid flow noise is likely to be generated in the evaporator), the first opening value N of the throttling device corresponding to the already started evaporator (hereinafter referred to as the evaporator for simplicity) is reduced. Specifically, the first opening value N corresponding to the double-open state is less than the first opening value N corresponding to the single-open state; that is, the opening reduction required in the single-open state is greater than the reduction required in the double-open state.

[0046] The range of the first opening value N corresponding to the single-open state is 80~100B, and the range of the first opening value N corresponding to the double-open state is 60~80B.

[0047] This embodiment takes into account that the amount of refrigerant in the single-operation state is relatively more than that in the double-operation state. This means that the probability of incomplete evaporation in the evaporator, resulting in liquid flow noise, is greater, or the volume of the liquid flow noise is louder. Therefore, the reduction in opening degree in the single-operation state is greater than that in the double-operation state. Compared with a fixed reduction of the same opening degree, the advantages are: on the one hand, it avoids insufficient reduction in opening degree in the single-operation state, which would not be able to effectively eliminate liquid flow noise; on the other hand, it avoids excessive reduction in opening degree in the double-operation state, which would prevent the evaporator from effectively cooling and affect the user experience.

[0048] S6a3. Determine the relationship between the difference between the inlet pipe temperature and the outlet pipe temperature and the first temperature threshold and the second temperature threshold.

[0049] In this embodiment, immediately reducing the opening value of the throttling device by the first degree is not enough to completely eliminate the liquid flow noise. The first degree value can be understood as a minimum reduction value as a safety measure. Further, the relationship between the difference between the inlet pipe temperature and the outlet pipe temperature and the first temperature threshold and the second temperature threshold is determined to further control the throttling device to reduce the opening at the corresponding rate.

[0050] The first temperature threshold is set to 0, and the second temperature threshold is set to a value between 3 and 5.

[0051] S6a4. If the difference is between the first temperature threshold and the second temperature threshold, the opening of the throttling device is further reduced at a first rate, wherein the value of the first rate is equal to the product of the first constant corresponding to the state determination result and the difference.

[0052] In this embodiment, if the difference between the inlet pipe temperature and the outlet pipe temperature is between the first temperature threshold and the second temperature threshold, it indicates that the amount of refrigerant in the system is slightly excessive. The throttling device can then further reduce its opening at a smaller rate, i.e., the first rate. The value of the first rate is equal to n*(Ta-Tb)B / s, where n is a constant, Ta is the inlet pipe temperature, and Tb is the outlet pipe temperature.

[0053] The value of the first constant n varies depending on the state determination result. The value of the first constant n corresponding to the single-open state is greater than the value of the first constant n corresponding to the double-open state. The range of the first constant n for the single-open state is 15~20, and the range of the first constant n for the double-open state is 10~15.

[0054] This embodiment takes into account that the amount of refrigerant in the single-on state is relatively more than that in the double-on state. This means that the probability of incomplete evaporation in the evaporator and the generation of liquid flow noise is greater, or the volume of the liquid flow noise is louder. Therefore, the opening reduction rate in the single-on state is greater than that in the double-on state. Compared with reducing the opening at the same rate, the advantages are: on the one hand, it avoids the liquid flow noise being effectively eliminated due to the slow reduction of the opening in the single-on state; on the other hand, it avoids the user experience being affected by the evaporator not being effectively cooled due to the slow reduction of the opening in the double-on state.

[0055] S6a5. If the difference is greater than the second temperature threshold, the opening of the throttling device is further reduced at a second rate, wherein the value of the second rate is equal to the product of the second constant corresponding to the state determination result and the difference.

[0056] In this embodiment, if the difference between the inlet pipe temperature and the outlet pipe temperature is greater than the second temperature threshold, it indicates that the amount of refrigerant in the system is excessive and seriously exceeds the limit. The throttling device can further reduce its opening at a faster rate, i.e., the second rate. The value of the second rate is equal to m*(Ta-Tb)B / s, where m is the second constant. That is, under the same state judgment result (i.e., both in single-open state or both in double-open state), the second constant m is greater than the first constant n.

[0057] The value of the second constant m varies depending on the state determination result. The value of the second constant m corresponding to the single-open state is greater than the value of the second constant m corresponding to the double-open state. The value range of the second constant m for the single-open state is 30~40, and the value range for the double-open state is 15~20.

[0058] In this embodiment, when the difference between the inlet pipe temperature and the outlet pipe temperature is greater than a second temperature threshold, the opening of the throttling device is reduced at a second rate, which is faster than the first rate. This flexibly corresponds to different gradients in the difference between the inlet pipe temperature and the outlet pipe temperature to reduce the opening of the throttling device, thereby eliminating the liquid flow noise of the evaporator more accurately and efficiently. Compared to reducing the opening at the same rate, this avoids the situation where the opening reduction is too slow when the difference between the inlet pipe temperature and the outlet pipe temperature is large, thus failing to effectively eliminate the liquid flow noise; and it also avoids the situation where the opening reduction is too fast when the difference between the inlet pipe temperature and the outlet pipe temperature is small, thus preventing the evaporator from effectively cooling and affecting the user experience.

[0059] This embodiment takes into account that the amount of refrigerant in the single-operation state is relatively more than that in the double-operation state. This means that the probability of incomplete evaporation in the evaporator, resulting in liquid flow noise, is greater, or the volume of the liquid flow noise is louder. Therefore, the reduction in opening degree in the single-operation state is greater than that in the double-operation state. Compared with a fixed reduction of the same opening degree, the advantages are: on the one hand, it avoids insufficient reduction in opening degree in the single-operation state, which would not be able to effectively eliminate liquid flow noise; on the other hand, it avoids excessive reduction in opening degree in the double-operation state, which would prevent the evaporator from effectively cooling and affect the user experience.

[0060] If the fourth judgment result is negative, that is, the inlet pipe temperature is lower than the outlet pipe temperature, it means that the refrigerant discharged from the evaporator is in a state of complete evaporation. At this time, the refrigerant is in a gaseous state at the evaporator outlet, so there will be no liquid flow noise. Therefore, no further throttling operation will be performed to ensure user experience.

[0061] Thus, the control method for reducing liquid flow noise in freely adjustable air conditioning units provided by this invention first determines whether the air conditioning system is currently under low load demand to determine if liquid flow noise may be generated. Furthermore, it accurately identifies the liquid flow noise generated in the system by measuring the inlet and outlet pipe temperatures of the evaporator. Compared to detecting the subcooling at the condenser outlet, directly detecting the refrigerant state of the evaporator results in more accurate and reliable detection results. By reducing the opening of the throttling device, the amount of refrigerant in the evaporator is reduced so that it can be completely evaporated, avoiding the accumulation of gas-liquid two-phase states that would generate liquid flow noise.

[0062] Furthermore, when determining that the opening of the throttling device should be reduced because the inlet pipe temperature is greater than the outlet pipe temperature, the opening is first reduced by decreasing the first opening value, and then the opening of the throttling device is gradually reduced at either the first or second rate according to the gradient relationship of the difference between the inlet and outlet pipe temperatures. This effectively avoids liquid flow noise while maintaining the normal operation of the air conditioning system. The compressor and outdoor fan can also be kept running at low frequency and low speed. Moreover, the air conditioning operating frequency and outdoor fan speed can be lower, the air conditioning operating range is wider, and it is more energy-efficient. Therefore, the air conditioning system using this control method is an energy-saving air conditioning system.

[0063] See also Figure 3 In some embodiments, after obtaining the inlet pipe temperature and outlet pipe temperature of the indoor heat exchanger if the second determination result is yes, the method further includes: S4b. Determine whether the air conditioning system is in the process of switching from other gears to the first gear, and obtain a fifth determination result, wherein the other gear is a higher gear than the first gear.

[0064] In this embodiment, considering that in addition to the air conditioning system currently being in the first gear, there is another situation where liquid flow noise may be generated when switching from a higher gear, such as the strong fan or super strong gear, to the first gear under low load demand, after obtaining the inlet pipe temperature and outlet pipe temperature of the indoor heat exchanger, it is also determined based on the operation command whether the air conditioning system is currently in the process of switching from other gears to the first gear, so as to comprehensively identify and adjust the low load demand operation mode of the air conditioning system to avoid generating liquid flow noise.

[0065] S5b. If the fifth judgment result is yes, reduce the opening of the throttling device according to the preset second adjustment strategy.

[0066] In this embodiment, if it is determined that the air conditioning system is in the process of switching from other settings to the first setting, it indicates that the heat exchange efficiency of the indoor evaporator is changing from strong to weak. At the same time, the noise will also decrease during the fan speed change. At this time, the refrigerant in the evaporator will definitely accumulate in the gas-liquid two-phase state due to the slowdown of heat exchange in the evaporator, which is easy to generate liquid flow noise in the evaporator. Therefore, according to the preset second adjustment strategy, the opening of the throttling device is reduced. By reducing the opening of the throttling device, the rate at which the refrigerant enters the evaporator is reduced, so as to avoid the heat exchange speed of the evaporator being unable to keep up with the flow rate of the refrigerant. This allows the evaporator to fully exchange heat, avoids the accumulation of gas-liquid two-phase state, and solves the problem of liquid flow noise easily generated in the evaporator without increasing the compressor frequency or the outdoor fan speed.

[0067] See also Figure 5 In some embodiments, reducing the opening of the throttling device according to a preset second adjustment strategy includes: S5b1, reduce the opening degree of the throttling device to the second opening degree value corresponding to the state determination result.

[0068] In this embodiment, unlike the first adjustment strategy described above, since the air conditioning system is in the process of switching fan speeds, the frequency and fan speed change relatively quickly, and the refrigerant temperature change is lagging. Therefore, in the second adjustment strategy, without judging the evaporator inlet pipe temperature and outlet pipe temperature, the opening of the throttling device is first reduced by the second opening value to avoid the refrigerant temperature lagging and causing liquid flow before adjusting the throttling device (equivalent to assuming the inlet pipe temperature is greater than or equal to the outlet pipe temperature).

[0069] Wherein, the second opening value M corresponding to the double-open state is less than the second opening value M corresponding to the single-open state, that is, the opening that needs to be reduced in the single-open state is greater than the opening that needs to be reduced in the double-open state.

[0070] The range of the second opening value M corresponding to the single-open state is 100~150B, and the range of the second opening value M corresponding to the double-open state is 80~120B.

[0071] It should be noted that although the range of possible values ​​for the second opening value M corresponding to the single-open state overlaps with the range of possible values ​​for the second opening value M corresponding to the double-open state, this does not contradict the fact that the second opening value M corresponding to the double-open state must be smaller than the second opening value M corresponding to the single-open state. For example, when the second opening value M corresponding to the single-open state is specifically taken as 110B, the second opening value M corresponding to the double-open state can be taken as 80-110B; when the second opening value M corresponding to the single-open state is specifically taken as 121B, the second opening value M corresponding to the double-open state can be taken as 80-120B.

[0072] The reason why the second opening value M corresponding to the double-open state is less than the second opening value M corresponding to the single-open state in this embodiment, and its beneficial effects, are similar to those described in S6a2, and will not be repeated here.

[0073] S5b2. Determine the relationship between the difference between the inlet pipe temperature and the outlet pipe temperature and the first temperature threshold and the second temperature threshold.

[0074] In this embodiment, after reducing the opening degree of the throttling device by the second opening degree value M, further adjustments are made based on the relationship between the difference between the inlet pipe temperature and the outlet pipe temperature and the first temperature threshold and the second temperature threshold.

[0075] The first temperature threshold is set to 0, and the second temperature threshold is set to a value between 3 and 5.

[0076] S5b3. If the difference is between the first temperature threshold and the second temperature threshold, the opening of the throttling device is further reduced at the first rate.

[0077] In this embodiment, if the difference between the inlet pipe temperature and the outlet pipe temperature is between the first temperature threshold and the second temperature threshold, it indicates that the amount of refrigerant in the system is slightly excessive. The throttling device can then further reduce its opening at a smaller rate, i.e., the first rate. The value of the first rate is equal to n*(Ta-Tb)B / s, where n is a constant, Ta is the inlet pipe temperature, and Tb is the outlet pipe temperature.

[0078] The value of the first constant n varies depending on the state determination result. The value of the first constant n corresponding to the single-open state is greater than the value of the first constant n corresponding to the double-open state. The value range of the first constant n for the single-open state is 15~20, and the value range of n for the double-open state is 10~15.

[0079] This embodiment takes into account that the amount of refrigerant in the single-on state is relatively more than that in the double-on state. This means that the probability of incomplete evaporation in the evaporator and the generation of liquid flow noise is greater, or the volume of the liquid flow noise is louder. Therefore, the opening reduction rate in the single-on state is greater than that in the double-on state. Compared with reducing the opening at the same rate, the advantages are: on the one hand, it avoids the liquid flow noise being effectively eliminated due to the slow reduction of the opening in the single-on state; on the other hand, it avoids the user experience being affected by the evaporator not being effectively cooled due to the slow reduction of the opening in the double-on state.

[0080] S5b4. If the difference is greater than the second temperature threshold, the opening of the throttling device is further reduced at the second rate.

[0081] In this embodiment, if the difference between the inlet pipe temperature and the outlet pipe temperature is greater than the second temperature threshold, it indicates that the amount of refrigerant in the system is excessive and seriously exceeds the limit. The throttling device can further reduce its opening at a faster rate, i.e., the second rate. The value of the second rate is equal to m*(Ta-Tb)B / s, where m is the second constant. That is, under the same state judgment result (i.e., both in single-open state or both in double-open state), the second constant m is greater than the first constant n.

[0082] The value of the second constant m varies depending on the state determination result. The value of the second constant m corresponding to the single-open state is greater than the value of the second constant m corresponding to the double-open state. The value range of the second constant m for the single-open state is 30~40, and the value range for the double-open state is 15~20.

[0083] In this embodiment, when the difference between the inlet pipe temperature and the outlet pipe temperature is greater than a second temperature threshold, the opening of the throttling device is reduced at a second rate, which is faster than the first rate. This flexibly corresponds to different gradients in the difference between the inlet pipe temperature and the outlet pipe temperature to reduce the opening of the throttling device, thereby eliminating the liquid flow noise of the evaporator more accurately and efficiently. Compared to reducing the opening at the same rate, this avoids the situation where the opening reduction is too slow when the difference between the inlet pipe temperature and the outlet pipe temperature is large, thus failing to effectively eliminate the liquid flow noise; and it also avoids the situation where the opening reduction is too fast when the difference between the inlet pipe temperature and the outlet pipe temperature is small, thus preventing the evaporator from effectively cooling and affecting the user experience.

[0084] In summary, the control method for reducing liquid flow noise in freely adjustable air conditioning systems provided by the embodiments of the present invention can not only solve the problem of liquid flow noise in the first gear of the air conditioning system, but also solve the problem of liquid flow noise that may be generated when the air conditioning system switches from a higher gear to the first gear through a differentiated adjustment strategy.

[0085] This invention also provides a control device for reducing fluid flow noise in freely adjustable air conditioning units. This device can be configured in the controller of an air conditioning system and is used to execute any embodiment of the aforementioned control method for reducing fluid flow noise in freely adjustable air conditioning units. Specifically, please refer to... Figure 6 , Figure 6 A schematic block diagram of a control device for reducing fluid flow noise in a free-flowing machine, provided in an embodiment of the present invention.

[0086] like Figure 6 As shown, the control device 100 for reducing the noise of fluid flow in a free-flowing machine includes: The first judgment unit 110 is used to respond to the operation command, determine whether the air conditioning system is currently in a preset mode, and obtain the first judgment result; The second judgment unit 120, if the first judgment result is yes, determines whether the air conditioning system is in a preset number of open states, and obtains the second judgment result; Temperature acquisition unit 130 is used to acquire the inlet pipe temperature and outlet pipe temperature of the indoor heat exchanger if the second judgment result is yes. The third judgment unit 140 judges whether the air conditioner system's fan speed is in the first position and obtains a third judgment result. The first position includes silent mode or low fan speed. The fourth judgment unit 150 is used to determine whether the inlet pipe temperature is greater than or equal to the outlet pipe temperature if the third judgment result is yes, and to obtain the fourth judgment result; The first adjustment unit 160 is used to reduce the opening of the throttling device according to a preset first adjustment strategy if the fourth judgment result is yes.

[0087] In some embodiments, when the fourth determination result is yes, the first adjustment unit 160 is used to reduce the opening of the throttling device according to a preset first adjustment strategy, specifically for: Determine whether the air conditioning system is in a single-on or double-on state, and obtain the state determination result. Different state results correspond to different adjustment parameters. The opening degree of the throttling device is reduced to the first opening value corresponding to the state determination result; Determine the relationship between the difference between the inlet pipe temperature and the outlet pipe temperature and the first temperature threshold and the second temperature threshold; If the difference is between the first temperature threshold and the second temperature threshold, the opening of the throttling device is further reduced at a first rate, where the value of the first rate is equal to the product of the first constant corresponding to the state determination result and the difference. If the difference is greater than the second temperature threshold, the opening of the throttling device is further reduced at a second rate, the value of which is equal to the product of the second constant corresponding to the state determination result and the difference. Wherein, the second constant is greater than the first constant.

[0088] In some embodiments, the control device 100 for reducing fluid flow noise in free-flowing models further includes: The fifth judgment unit 170 is used to determine whether the air conditioning system is in the process of switching from other gears to the first gear, and to obtain the fifth judgment result, wherein the other gear is a higher gear than the first gear; The second adjustment unit 180 is used to reduce the opening of the throttling device according to a preset second adjustment strategy if the fifth judgment result is yes.

[0089] In some embodiments, when the fifth determination result is yes, the second adjustment unit 180 is used to reduce the opening of the throttling device according to a preset second adjustment strategy, specifically for: The opening degree of the throttling device is reduced to the second opening value corresponding to the state determination result; Determine the relationship between the difference between the inlet pipe temperature and the outlet pipe temperature and the first temperature threshold and the second temperature threshold; If the difference is between the first temperature threshold and the second temperature threshold, the opening of the throttling device is further reduced at the first rate. If the difference is greater than the second temperature threshold, the opening of the throttling device is further reduced at the second rate.

[0090] The aforementioned control device for reducing the noise of fluid flow in free-flowing models can be implemented as a computer program, which can be used in, for example... Figure 7 It runs on the computer device shown.

[0091] Please see Figure 7 , Figure 7 This is a schematic block diagram of a computer device provided in an embodiment of the present invention.

[0092] The computer device 500 includes a processor 502, a memory, and a network interface 505 connected via a communication bus 501. The memory may include a storage medium 503 and internal memory 504.

[0093] The storage medium 503 may store an operating system 5031 and a computer program 5032. When the computer program 5032 is executed, it causes the processor 502 to execute a control method for reducing the hydraulic noise of the free-flowing machine. The storage medium 503 may be a volatile storage medium or a non-volatile storage medium.

[0094] The processor 502 provides computing and control capabilities to support the operation of the entire computer device 500.

[0095] The internal memory 504 provides an environment for the operation of the computer program 5032 in the storage medium 503. When the computer program 5032 is executed by the processor 502, the processor 502 can execute a control method to reduce the flow noise of the free-flowing machine.

[0096] This network interface 505 is used for network communication, such as providing data transmission. Those skilled in the art will understand that... Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the computer device 500 to which the present invention is applied. The specific computer device 500 may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0097] The processor 502 is used to run the computer program 5032 stored in the memory to implement the corresponding function in the above-mentioned control method for reducing the liquid flow noise of the free-flowing machine.

[0098] Those skilled in the art will understand that Figure 7 The embodiments of the computer device shown do not constitute a limitation on the specific configuration of the computer device. In other embodiments, the computer device may include more or fewer components than illustrated, or combine certain components, or have different component arrangements. For example, in some embodiments, the computer device may include only memory and a processor. In such embodiments, the structure and function of the memory and processor are different from those shown. Figure 7 The embodiments shown are consistent and will not be described again here.

[0099] It should be understood that, in this embodiment of the invention, the processor 502 may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0100] In another embodiment of the invention, a computer-readable storage medium is provided. This computer-readable storage medium may be volatile or non-volatile. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps included in the above-described control method for reducing hydraulic noise in a free-flowing machine.

[0101] Those skilled in the art will readily understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0102] In the embodiments provided by this invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Units with the same function may be grouped into one unit. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, or it may be an electrical, mechanical, or other form of connection.

[0103] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention, depending on actual needs.

[0104] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0105] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a computer-readable storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned computer-readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), magnetic disks, or optical disks.

[0106] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A control method for reducing fluid flow noise in a free-flowing machine, characterized in that, The system is applied to an air conditioning system, which includes an outdoor unit and multiple indoor units connected in parallel. Each indoor unit includes an indoor heat exchanger and a throttling device disposed between the indoor heat exchanger and the outdoor unit. The control method includes: In response to the operation command, determine whether the air conditioning system is currently in a preset mode and obtain the first determination result; If the first judgment result is yes, determine whether the air conditioning system is in the preset number of open states, and obtain the second judgment result; If the second determination result is yes, obtain the inlet pipe temperature and outlet pipe temperature of the indoor heat exchanger; Determine whether the air conditioning system's fan speed is in the first position to obtain a third judgment result. The first position includes silent mode or low fan speed. If the third judgment result is yes, then determine whether the inlet pipe temperature is greater than or equal to the outlet pipe temperature to obtain the fourth judgment result; If the fourth judgment result is yes, the opening degree of the throttling device is reduced according to the preset first adjustment strategy.

2. The control method for reducing fluid flow noise in a free-flowing machine according to claim 1, characterized in that, The preset number of opening states includes a single-open state and a double-open state; the step of reducing the opening degree of the throttling device according to the preset first adjustment strategy includes: Determine whether the air conditioning system is in a single-on or double-on state, and obtain the state determination result. Different state results correspond to different adjustment parameters. The opening degree of the throttling device is reduced to the first opening value corresponding to the state determination result; Determine the relationship between the difference between the inlet pipe temperature and the outlet pipe temperature and the first temperature threshold and the second temperature threshold; If the difference is between the first temperature threshold and the second temperature threshold, the opening of the throttling device is further reduced at a first rate, where the value of the first rate is equal to the product of the first constant corresponding to the state determination result and the difference. If the difference is greater than the second temperature threshold, the opening of the throttling device is further reduced at a second rate, the value of which is equal to the product of the second constant corresponding to the state determination result and the difference. Wherein, the second constant is greater than the first constant.

3. The control method for reducing fluid flow noise in a free-flowing machine according to claim 2, characterized in that, If the second determination result is yes, after obtaining the inlet pipe temperature and outlet pipe temperature of the indoor heat exchanger, the process further includes: The system determines whether the air conditioning system is in the process of switching from other gears to the first gear, and obtains a fifth determination result, wherein the other gear is a higher gear than the first gear; If the fifth judgment result is yes, the opening degree of the throttling device is reduced according to the preset second adjustment strategy.

4. The control method for reducing fluid flow noise in a free-flowing machine according to claim 3, characterized in that, The step of reducing the opening of the throttling device according to the preset second adjustment strategy includes: The opening degree of the throttling device is reduced to the second opening value corresponding to the state determination result; Determine the relationship between the difference between the inlet pipe temperature and the outlet pipe temperature and the first temperature threshold and the second temperature threshold; If the difference is between the first temperature threshold and the second temperature threshold, the opening of the throttling device is further reduced at the first rate. If the difference is greater than the second temperature threshold, the opening of the throttling device is further reduced at the second rate.

5. The control method for reducing fluid flow noise in a free-flowing machine according to claim 4, characterized in that, The second opening value corresponding to the double-open state is less than the second opening value corresponding to the single-open state.

6. The control method for reducing fluid flow noise in a free-flowing machine according to claim 2, characterized in that, The first opening value corresponding to the double-open state is less than the first opening value corresponding to the single-open state.

7. The control method for reducing fluid flow noise in a free-flowing machine according to claim 2, characterized in that, The first constant corresponding to the single-open state is greater than the first constant corresponding to the double-open state; the second constant corresponding to the single-open state is greater than the second constant corresponding to the double-open state.

8. A control device for reducing fluid flow noise in a free-flowing machine, characterized in that, For performing the control method according to any one of claims 1-7, the control device comprises: The first judgment unit is used to respond to the operation command, determine whether the air conditioning system is currently in a preset mode, and obtain the first judgment result; The second judgment unit, if the first judgment result is yes, determines whether the air conditioning system is in a preset number of open states, and obtains the second judgment result; A temperature acquisition unit is used to acquire the inlet pipe temperature and outlet pipe temperature of the indoor heat exchanger if the second judgment result is yes. The third judgment unit determines whether the air conditioning system's fan speed is in the first position and obtains a third judgment result. The first position includes silent mode or low fan speed. The fourth judgment unit is used to determine whether the inlet pipe temperature is greater than or equal to the outlet pipe temperature if the third judgment result is yes, and to obtain the fourth judgment result; The first adjustment unit is used to reduce the opening of the throttling device according to a preset first adjustment strategy if the fourth judgment result is yes.

9. A computer device, characterized in that, The device includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; When a processor executes a program stored in a memory, it implements the steps of the control method for reducing fluid flow noise in any of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for reducing fluid flow noise in a free-flowing machine as described in any one of claims 1-7.

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