Liquid separation control method and device, air conditioner, storage medium and program product

Abstract

The invention provides a liquid separation control method and device, an air conditioner, a storage medium and a program product. The liquid separation control method comprises the steps that under the condition that the outdoor environment temperature is lower than a first temperature threshold value, an air suction pressure value, collected by a first sensor, of a compressor and an exhaust pressure value, collected by a second sensor, of the compressor are received in a first preset period; and under the condition that the ratio of the exhaust pressure value to the suction pressure value is not within the first preset range, the opening degree of a flow adjusting valve on one of N refrigerant branches passing through the outdoor unit heat exchanger is adjusted so that the ratio can be adjusted to be within the first preset range, and N is a positive integer larger than 1.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to a liquid separation control method and device, an air conditioner, a storage medium and a program product. Background Art

[0002] At present, the liquid cooling module mainly uses finned heat exchangers for heat exchange. In order to reduce the pressure loss of the refrigerant along the way, before the refrigerant enters the heat exchanger, the refrigerant pipeline is divided into several parallel branches through a liquid distributor so that they can flow into the heat exchanger for heat exchange. Summary of the invention

[0003] The inventors noticed that in the prior art, due to the quality of the liquid distributor, pipeline pressure drop, heat exchange conditions, operating time and other factors, the refrigerant flow entering the heat exchanger will be uneven, resulting in different heat exchange amounts in different branches. This will cause the condensing pressure at the exhaust port of the compressor to be too low, and it is impossible to ensure that the pressure difference between the condensing pressure at the exhaust port of the compressor and the evaporation pressure at the suction port of the compressor is within the normal range, thereby increasing the loss of the compressor, causing damage to the compressor, and reducing the service life of the compressor.

[0004] Based on this, the present disclosure provides a liquid separation control method, which, when the outdoor ambient temperature is lower than a first temperature threshold, receives the suction pressure value of the compressor collected by a first sensor and the exhaust pressure value of the compressor collected by a second sensor at a first predetermined period, and adjusts the opening of one of the multiple branches according to the exhaust pressure and suction pressure of the compressor to ensure that the suction and exhaust pressure difference of the compressor is within a reasonable range, thereby reducing the loss of the compressor, avoiding damage to the compressor, and extending the service life of the compressor.

[0005] According to a first aspect of an embodiment of the present disclosure, a liquid separation control method is provided, which is executed by a liquid separation control device, including: when the outdoor ambient temperature is lower than a first temperature threshold, receiving a suction pressure value of the compressor collected by a first sensor and an exhaust pressure value of the compressor collected by a second sensor at a first predetermined period; when the ratio of the exhaust pressure value to the suction pressure value is not within a first predetermined range, adjusting the opening of a flow regulating valve on one of N refrigerant branches passing through an outdoor unit heat exchanger so as to adjust the ratio to within the first predetermined range, where N is a positive integer greater than 1.

[0006] In some embodiments, among the N refrigerant branches, heights from the 1st refrigerant branch to the Nth refrigerant branch decrease sequentially.

[0007] In some embodiments, adjusting the opening of a flow regulating valve on one of N refrigerant branches passing through an outdoor unit heat exchanger includes: when the ratio is less than the lower limit of the first predetermined range, querying the first refrigerant branch that is in an open state in order from the first refrigerant branch to the Nth refrigerant branch; if the i-th refrigerant branch is the first refrigerant branch that is in an open state, closing the flow regulating valve on the i-th refrigerant branch, 1≤i≤N-1.

[0008] In some embodiments, adjusting the opening of a flow control valve on one of N refrigerant branches passing through the outdoor unit heat exchanger includes: if the 1st refrigerant branch to the N-1th refrigerant branch are all in a closed state, controlling the compressor to stop.

[0009] In some embodiments, adjusting the opening of a flow regulating valve on one of N refrigerant branches passing through an outdoor unit heat exchanger includes: when the ratio is greater than the upper limit value of the first predetermined range, querying the first refrigerant branch that is not in the maximum opening state in order from the Nth refrigerant branch to the 1st refrigerant branch; if the jth refrigerant branch is the first refrigerant branch that is not in the maximum opening state, maximizing the flow regulating valve on the jth refrigerant branch, 1≤j≤N.

[0010] In some embodiments, the upper limit value of the first predetermined range is a ratio of a predetermined high pressure protection parameter to a suction pressure value of the compressor.

[0011] In some embodiments, when the outdoor ambient temperature is greater than a second temperature threshold, a first branch pressure value collected by a third sensor located on each refrigerant branch passing through the air-conditioning heat exchanger is received at a second predetermined period, wherein the first branch pressure value is the pressure value of the refrigerant in each refrigerant branch before entering the air-conditioning heat exchanger, and the second temperature threshold is greater than the first temperature threshold; the pressure average of the first branch pressure values ​​of the N refrigerant branches is calculated; and when the difference between the pressure average and the first branch pressure value of the kth refrigerant branch is not within a second predetermined range, the opening of the flow regulating valve on the kth refrigerant branch is adjusted so as to adjust the difference between the pressure average and the first branch pressure value of the kth refrigerant branch to within the second predetermined range, 1≤k≤N.

[0012] In some embodiments, adjusting the opening of the flow regulating valve on the kth refrigerant branch includes: when the difference between the pressure average value and the first branch pressure value of the kth refrigerant branch is less than the lower limit value of the second predetermined range, reducing the opening of the flow regulating valve on the kth refrigerant branch.

[0013] In some embodiments, adjusting the opening of the flow regulating valve on the kth refrigerant branch includes: when the difference between the pressure average value and the first branch pressure value of the kth refrigerant branch is greater than the upper limit value of the second predetermined range, increasing the opening of the flow regulating valve on the kth refrigerant branch.

[0014] In some embodiments, when the outdoor ambient temperature is greater than the second temperature threshold, the second branch pressure collected by the fourth sensor located on each refrigerant branch is received at the second predetermined period, the second branch pressure being the pressure of the refrigerant in each refrigerant branch after leaving the air-conditioning heat exchanger; detecting whether the second branch pressure value of the mth refrigerant branch is abnormal, where 1≤m≤N; and when the second branch pressure value of the mth refrigerant branch is abnormal, closing the flow regulating valve on the mth refrigerant branch, and sending an alarm message.

[0015] In some embodiments, the detecting whether the second branch pressure value of the mth refrigerant branch is abnormal includes: detecting whether the second branch pressure value of the mth refrigerant branch is the atmospheric pressure value of the current environment; and determining that the second branch pressure value of the mth refrigerant branch is abnormal when the second branch pressure value of the mth refrigerant branch is the atmospheric pressure value.

[0016] In some embodiments, the detecting whether the second branch pressure value of the mth refrigerant branch is abnormal includes: calculating the pressure difference between the second branch pressure value of the mth refrigerant branch and the first branch pressure value of the mth refrigerant branch; judging whether the pressure difference is less than a pressure difference threshold; and determining that the second branch pressure value of the mth refrigerant branch is abnormal when the pressure difference is less than the pressure difference threshold.

[0017] In some embodiments, the air conditioner heat exchanger includes at least one of an outdoor heat exchanger and an indoor heat exchanger, wherein the outdoor heat exchanger and the indoor heat exchanger are liquid-cooled heat exchangers.

[0018] According to a second aspect of an embodiment of the present disclosure, there is provided a liquid dispensing control device, comprising: a memory; a processor, coupled to the memory, the processor being configured to execute a liquid dispensing control method as described in any of the above embodiments based on instructions stored in the memory.

[0019] According to a third aspect of an embodiment of the present disclosure, an air conditioner is provided, comprising: a liquid separation control device as described in any of the above embodiments; a first sensor configured to collect a suction pressure value of a compressor; a second sensor configured to collect a discharge pressure value of the compressor; N refrigerant branches, wherein the N refrigerant branches pass through an outdoor unit heat exchanger, and each of the N refrigerant branches is provided with a flow regulating valve, and N is a positive integer greater than 1.

[0020] In some embodiments, the third sensor disposed on each refrigerant branch is configured to collect the pressure value of the refrigerant in each refrigerant branch before entering the air-conditioning heat exchanger.

[0021] In some embodiments, the air conditioner further comprises: a fourth sensor disposed on each refrigerant branch, configured to collect the pressure of the refrigerant in each refrigerant branch after leaving the air conditioner heat exchanger.

[0022] In some embodiments, the air conditioner heat exchanger includes at least one of an outdoor heat exchanger and an indoor heat exchanger, wherein the outdoor heat exchanger and the indoor heat exchanger are liquid-cooled heat exchangers.

[0023] According to a fourth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the liquid separation control method as described in any of the above embodiments is implemented.

[0024] According to a fifth aspect of an embodiment of the present disclosure, there is provided a computer program product, comprising computer instructions, wherein when the computer instructions are executed by a processor, the liquid separation control method as described in any of the above embodiments is implemented.

[0025] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 A schematic diagram of a liquid separation structure of an embodiment of the prior art;

[0028] Figure 2 A schematic flow chart of a liquid dispensing control method according to an embodiment of the present disclosure;

[0029] Figure 3 It is a flow chart of a liquid dispensing control method according to another embodiment of the present disclosure;

[0030] Figure 4 It is a structural schematic diagram of a liquid separation control device according to an embodiment of the present disclosure;

[0031] Figure 5 A schematic diagram of the structure of an air conditioner according to an embodiment of the present disclosure;

[0032] Figure 6 It is a structural schematic diagram of an air conditioner according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0034] Unless specifically stated otherwise, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0035] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0036] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0037] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0038] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0039] Figure 1 The figure is a schematic diagram of a liquid separation structure of an embodiment in the prior art.

[0040] like Figure 1 As shown, before the refrigerant enters the heat exchanger, the refrigerant pipeline 11 is divided into a plurality of parallel branches 111, 112, ..., 11n by a liquid separator 10 so as to flow into the heat exchanger 12 for heat exchange respectively.

[0041] It should be noted here that Figure 1 The arrow direction is the direction of refrigerant flow.

[0042] Due to the quality of the distributor, pipeline pressure drop, heat exchange conditions, operating time and other factors, the refrigerant flow entering the heat exchanger will be uneven, resulting in different heat exchange rates in different branches. This will cause the condensing pressure at the exhaust port of the compressor to be too low, and it will be impossible to ensure that the pressure difference between the condensing pressure at the exhaust port of the compressor and the evaporation pressure at the suction port of the compressor is within the normal range, thereby increasing the loss of the compressor, causing damage to the compressor, and reducing the service life of the compressor.

[0043] Accordingly, the present disclosure provides a liquid separation control method, which adjusts the opening of the branch according to the exhaust pressure and suction pressure of the compressor to ensure that the suction and exhaust pressure difference of the compressor is within a reasonable range, reduce compressor losses, avoid compressor damage, and extend the service life of the compressor.

[0044] Figure 2 The flowchart of the liquid separation control method of one embodiment of the present disclosure is shown in FIG.

[0045] In step 21 , when the outdoor ambient temperature is lower than a first temperature threshold, a suction pressure value of the compressor collected by a first sensor and a discharge pressure value of the compressor collected by a second sensor are received at a first predetermined period.

[0046] For example, the first temperature threshold is -15°C, and the first predetermined period is 60 seconds.

[0047] In step 22, when the ratio of the exhaust pressure value to the suction pressure value is not within the first predetermined range, the opening of the flow regulating valve on one of the N refrigerant branches passing through the outdoor unit heat exchanger is adjusted to adjust the ratio to within the first predetermined range, where N is a positive integer greater than 1.

[0048] It should be noted here that when the outdoor ambient temperature is low, the air conditioner outdoor unit heat exchanger is a condenser.

[0049] In some embodiments, among the N refrigerant branches, the heights of the first refrigerant branch to the Nth refrigerant branch decrease sequentially.

[0050] It should be noted here that, according to the law of the air duct flow field, the condenser wind speed gradually decreases from top to bottom, so the refrigerant branches at different heights have different degrees of influence on the pressure ratio between the condensing pressure and the evaporating pressure of the compressor. For example, among the N refrigerant branches, the heights of the 1st refrigerant branch to the Nth refrigerant branch decrease successively, and the heat exchange effect of each branch gradually decreases in the direction from the 1st refrigerant branch to the Nth refrigerant branch. By adjusting the opening of the corresponding branch, the pressure ratio between the condensing pressure and the evaporating pressure of the compressor can be quickly adjusted.

[0051] In the liquid separation control method provided in the above-mentioned embodiment of the present disclosure, in a predetermined cycle, the opening of one of the multiple branches is adjusted according to the condensing pressure at the exhaust port of the compressor and the evaporating pressure at the intake port to ensure that the pressure ratio between the condensing pressure and the evaporating pressure of the compressor is within a reasonable range, thereby effectively reducing the compressor loss, avoiding damage to the compressor, and extending the service life of the compressor.

[0052] It should also be noted that if the air conditioner only includes one refrigerant pipeline, if the opening of the refrigerant pipeline changes, it will inevitably have a significant impact on the circulation of the refrigerant, thereby having a negative impact on the safe operation of the air conditioner. In the above embodiment of the present disclosure, the refrigerant pipeline is divided into multiple parallel refrigerant branches by a liquid separator. In this case, when the opening of one refrigerant branch changes, while the other refrigerant branches do not change, it can be ensured that in the process of adjusting the pressure ratio between the condensing pressure and the evaporation pressure of the compressor, there will be no significant impact on the circulation of the refrigerant, thereby effectively avoiding damage to the various components of the air conditioner due to significant changes in the circulation of the refrigerant.

[0053] In some embodiments, the step of adjusting the opening of a flow control valve on one of the N refrigerant branches passing through the outdoor unit heat exchanger includes the following contents.

[0054] 1) When the ratio is less than the lower limit of the first predetermined range, query the first refrigerant branch in the open state in order from the 1st refrigerant branch to the Nth refrigerant branch.

[0055] For example, the lower limit value of the first predetermined range is 1.5.

[0056] 2) If the i-th refrigerant branch is the first refrigerant branch in an open state, close the flow regulating valve on the i-th refrigerant branch, 1≤i≤N-1.

[0057] For example, if the first refrigerant branch is currently in an open state, the flow regulating valve on the first refrigerant branch is closed.

[0058] For another example, if the first refrigerant branch is currently in a closed state, and the second refrigerant branch is in an open state, the flow regulating valve on the second refrigerant branch is closed.

[0059] It should be noted here that when the ratio of the exhaust pressure value to the suction pressure value is less than the lower limit of the first predetermined range, the valves of the refrigerant branches are closed in sequence from the 1st branch to the N-1th branch. This can reduce the heat exchange capacity of the condenser, thereby increasing the condensing pressure and further increasing the ratio of the exhaust pressure value to the suction pressure value.

[0060] In some embodiments, if the 1st to N-1th refrigerant branches are all in a closed state, the compressor is controlled to stop.

[0061] It should be noted here that if the first N-1 branches have been closed, if the Nth branch is closed at this time, the refrigerant will not flow normally. In this case, the compressor is controlled to shut down to protect the compressor from damage.

[0062] In some embodiments, adjusting the opening of a flow control valve on one of N refrigerant branches passing through an outdoor unit heat exchanger includes the following contents.

[0063] 1) When the ratio is greater than the upper limit of the first predetermined range, query the first refrigerant branch that is not in the maximum opening state in order from the Nth refrigerant branch to the 1st refrigerant branch.

[0064] In some embodiments, the upper limit value of the first predetermined range is a ratio of a predetermined high pressure protection parameter to a suction pressure of the compressor.

[0065] It should be noted here that by setting the high-pressure protection parameters, the upper limit value of the predetermined range can be flexibly adjusted, so as to control the ratio of the exhaust pressure value to the suction pressure value within an appropriate range, effectively ensuring the normal operation of the compressor.

[0066] In some embodiments, the high voltage protection parameter is the difference between a predetermined high voltage protection value and a predetermined high voltage maintenance constant. It should be noted that by setting a predetermined high voltage protection value and a predetermined high voltage maintenance constant, the value of the high voltage protection value can be flexibly adjusted, thereby facilitating the flexible adjustment of the upper limit value of the predetermined range.

[0067] For example, in order to ensure the normal operation of the compressor, the upper limit value of the first predetermined range is greater than 1.8.

[0068] 2) If the j-th refrigerant branch is the first refrigerant branch that is not in the maximum opening state, maximize the flow control valve on the j-th refrigerant branch, 1≤j≤N.

[0069] It should be noted here that, among the N refrigerant branches, the heights of the 1st refrigerant branch to the Nth refrigerant branch decrease successively. At the same time, according to the law of the air duct flow field, the wind speed of the condenser gradually decreases from top to bottom. Therefore, in the direction from the 1st refrigerant branch to the Nth refrigerant branch, the heat exchange effect of each branch gradually decreases. In other words, compared with maximizing the valves on the refrigerant branch at a higher position, maximizing the valves on the refrigerant branch at a lower position has less impact on the stable operation of the air conditioner. Therefore, maximizing the valves of a refrigerant branch in order from the Nth to the 1st can be beneficial to the stable operation of the air conditioning system. Through the above-mentioned treatment, the heat exchange capacity of the condenser can be improved, thereby reducing the condensing pressure, that is, the exhaust pressure of the compressor, the ratio of the exhaust pressure value to the suction pressure value.

[0070] For example, if the Nth refrigerant branch is not currently in a maximum opening state, the flow control valve on the Nth refrigerant branch is maximized.

[0071] For another example, if the Nth refrigerant branch is currently in the maximum opening state, and the N-1th refrigerant branch is not currently in the maximum opening state, the flow control valve on the N-1th refrigerant branch is maximized. And so on.

[0072] Figure 3 The flowchart of the liquid separation control method of one embodiment of the present disclosure is shown in FIG.

[0073] In step 31, when the outdoor ambient temperature is greater than the second temperature threshold, the first branch pressure value collected by the third sensor located on each refrigerant branch passing through the air-conditioning heat exchanger is received at a second predetermined period, wherein the first branch pressure value is the pressure value of the refrigerant in each refrigerant branch before entering the air-conditioning heat exchanger, and the second temperature threshold is greater than the first temperature threshold.

[0074] For example, the second temperature threshold is 10° C., and the second predetermined period is 300 seconds.

[0075] In some embodiments, the air conditioner heat exchanger includes at least one of an outdoor heat exchanger and an indoor heat exchanger.

[0076] For example, the outdoor unit heat exchanger and the indoor unit heat exchanger are liquid-cooled heat exchangers.

[0077] It should be noted here that under normal and high temperature conditions, the air conditioning performance can be further optimized by adjusting the condenser and evaporator.

[0078] In step 32, the average pressure value of the first branch pressure values ​​of the N refrigerant branches is calculated.

[0079] In step 33, when the difference between the average pressure value and the first branch pressure value of the kth refrigerant branch is not within the second predetermined range, the opening of the flow regulating valve on the kth refrigerant branch is adjusted to adjust the difference between the average pressure value and the first branch pressure value of the kth refrigerant branch to within the second predetermined range, 1≤k≤N.

[0080] It should be noted here that when the outdoor ambient temperature is greater than the second temperature threshold, the refrigerant pressure of each branch before entering the heat exchanger is collected to obtain the average refrigerant pressure of each branch. like If the difference between the refrigerant pressure HPk of the kth branch before entering the heat exchanger is no longer within the predetermined range, it indicates that there is an uneven liquid distribution problem in this branch, and therefore it is necessary to adjust the opening of the branch to solve the uneven liquid distribution problem.

[0081] In some embodiments, when the difference between the average pressure value and the first branch pressure value of the kth refrigerant branch is smaller than the lower limit of the second predetermined range, the opening of the flow regulating valve on the kth refrigerant branch is reduced.

[0082] It should be noted here that if the average refrigerant pressure If the difference △HPk between the refrigerant pressure HPk of the kth branch before entering the heat exchanger and the refrigerant pressure HPk of the kth branch is less than the lower limit value △xp1 of the second predetermined range, it means that the refrigerant flow rate of the kth branch is large, and the temperature of the refrigerant is high after passing through the heat exchanger, resulting in poor heat exchange effect and a small pressure drop of the branch. In this case, it is necessary to reduce the opening of the branch to reduce the flow rate and increase the pressure drop of the branch.

[0083] In some embodiments, when the difference between the average pressure value and the first branch pressure value of the kth refrigerant branch is greater than the upper limit of the second predetermined range, the opening of the flow control valve on the kth refrigerant branch is increased.

[0084] It should be noted here that if the average refrigerant pressure If the difference △HPk between the refrigerant pressure HPk of the kth branch before entering the heat exchanger is greater than the upper limit value △xp2 of the second predetermined range, it means that the refrigerant flow rate is small, the refrigerant is all used for heat exchange, and is overcooled after reaching the saturation temperature. The temperature of the refrigerant is lower after passing through the heat exchanger. Therefore, the pressure drop of this branch is large. At this time, it is necessary to increase the opening to increase the flow rate and reduce the pressure drop of this branch.

[0085] In summary, the opening adjustment of the kth branch is shown in Table 1.

[0086] △HPk<△xp1 △xp1≤△HPk≤△xp2 △HPk>△xp2 Situation Analysis Too much fluid normal Liquid supply is too small Adjustment action Reduce opening No opening adjustment Increase opening

[0087] Table 1

[0088] In some embodiments, when the outdoor ambient temperature is greater than the second temperature threshold, the second branch pressure collected by the fourth sensor located on each refrigerant branch is received at a second predetermined period, and the second branch pressure is the pressure of the refrigerant in each refrigerant branch after leaving the air conditioner heat exchanger. It is detected whether the second branch pressure value of the mth refrigerant branch is abnormal, where 1≤m≤N. If the second branch pressure value of the mth refrigerant branch is abnormal, the flow regulating valve on the mth refrigerant branch is closed, and an alarm message is sent.

[0089] It should be noted here that if the pressure value of the second branch of the mth refrigerant branch is abnormal, it indicates that there is a fault in the branch and the branch needs to be closed so as to affect the normal operation of the system.

[0090] In some embodiments, the step of detecting whether the second branch pressure value of the mth refrigerant branch is abnormal includes the following contents.

[0091] 1) Detect whether the second branch pressure value of the mth refrigerant branch is the atmospheric pressure value of the current environment.

[0092] 2) When the second branch pressure value of the m-th refrigerant branch is the atmospheric pressure value, it is determined that the second branch pressure value of the m-th refrigerant branch is abnormal.

[0093] It should be noted here that if the second branch pressure value of the m-th refrigerant branch is the atmospheric pressure value, it indicates that there is a pipeline leakage in the branch.

[0094] In some embodiments, the step of detecting whether the second branch pressure value of the mth refrigerant branch is abnormal includes the following contents.

[0095] 1) Calculate the pressure difference between the second branch pressure value of the m-th refrigerant branch and the first branch pressure value of the m-th refrigerant branch.

[0096] 2) Determine whether the pressure difference is less than the pressure difference threshold.

[0097] For example, by setting the pressure difference threshold, if the pressure difference is less than the pressure difference threshold, it indicates that the pressure difference is close to zero.

[0098] 3) When the pressure difference is less than the pressure difference threshold, it is determined that the pressure value of the second branch of the m-th refrigerant branch is abnormal.

[0099] It should be noted here that if the pressure drop of the mth refrigerant branch is close to 0, it means that there is no pressure drop in the branch and the heat exchange of the pipeline in the branch is very poor, such as in a refrigeration blind area.

[0100] Figure 4 It is a schematic structural diagram of a liquid separation control device according to an embodiment of the present disclosure.

[0101] like Figure 4 As shown, the liquid dispensing control device 40 can be embodied in the form of a general-purpose computing device. The liquid dispensing control device 40 includes a memory 41, a processor 42, and a bus 43 connecting different system components.

[0102] The memory 41 may include, for example, a system memory, a non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application, a boot loader, and other programs. The system memory may include a volatile storage medium, such as a random access memory (RAM) and / or a cache memory. The non-volatile storage medium may store, for example, instructions of a corresponding embodiment of at least one liquid dispensing control method being executed. The non-volatile storage medium includes, but is not limited to, a disk storage, an optical storage, a flash memory, and the like.

[0103] The processor 42 may be implemented by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistors, etc., as discrete hardware components. Accordingly, each module such as an acquisition module, a calculation module, and an adjustment module may be implemented by a central processing unit (CPU) running instructions in a memory that execute corresponding steps, or may be implemented by a dedicated circuit that executes corresponding steps.

[0104] For example, the processor 42 is configured to execute instructions stored in the memory to implement the following Figure 2 and Figure 3 The method of any one of the embodiments.

[0105] The bus 43 may use any of a variety of bus structures, including, but not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, and a Peripheral Component Interconnect (PCI) bus.

[0106] The interfaces 44, 45, 46 of the liquid dispensing control device 40 and the memory 41 and the processor 42 can be connected via a bus 43. The input / output interface 44 can provide a connection interface for input / output devices such as a display, a mouse, and a keyboard. The network interface 45 provides a connection interface for various networked devices. The storage interface 46 provides a connection interface for external storage devices such as a floppy disk, a USB flash drive, and an SD card.

[0107] Here, various aspects of the present disclosure are described with reference to flowcharts and / or block diagrams of methods, devices, and computer program products according to embodiments of the present disclosure. It should be understood that each frame of the flowchart and / or block diagram and the combination of frames can be implemented by computer-readable program instructions.

[0108] These computer-readable program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable device to produce a machine, so that the processor executes the instructions to produce means for implementing the functions specified in one or more blocks in the flowchart and / or block diagram.

[0109] These computer-readable program instructions may also be stored in a computer-readable memory, which cause the computer to work in a specific manner to produce an article of manufacture, including instructions for implementing the functions specified in one or more blocks in the flowchart and / or block diagram.

[0110] The present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects.

[0111] The present disclosure also provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the following is implemented: Figure 2 and Figure 3 The method of any one of the embodiments.

[0112] The present disclosure also provides a computer program product, including computer instructions, wherein when the computer instructions are executed by a processor, the following is achieved: Figure 2 and Figure 3 The method of any one of the embodiments.

[0113] Figure 5 The present invention is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.

[0114] like Figure 5 As shown, the air conditioner includes a liquid separation control device 50, a first sensor 51, a second sensor 52 and N refrigerant branches 531, 532, ..., 53N, where N is a positive integer greater than 1. The N refrigerant branches pass through the outdoor unit heat exchanger 55, and each refrigerant branch is provided with a flow regulating valve, that is, Figure 5 The flow control valves 541, 542, ..., 54N in the liquid separation control device 50 are Figure 4 A liquid separation control device according to any one of the embodiments.

[0115] It should be noted here that before the refrigerant enters the outdoor heat exchanger 55, the refrigerant pipeline is divided into several parallel branches 531, 532, ..., 53N by a liquid separator so that they can flow into the outdoor heat exchanger 55 for heat exchange.

[0116] The first sensor 51 is configured to collect the suction pressure value of the air-conditioning compressor. The second sensor 52 is configured to collect the exhaust pressure value of the air-conditioning compressor.

[0117] exist Figure 5 In the figure, the arrow direction is the refrigerant flow direction.

[0118] It should be noted here that in a predetermined cycle, the opening of one of the multiple branches is adjusted according to the condensing pressure at the exhaust port of the compressor and the evaporating pressure at the intake port to ensure that the pressure ratio between the condensing pressure and the evaporating pressure of the compressor is within a reasonable range, thereby effectively reducing compressor losses, avoiding compressor damage, and extending the service life of the compressor.

[0119] Figure 6 It is a structural schematic diagram of an air conditioner according to another embodiment of the present disclosure.

[0120] Figure 6 and Figure 5 The difference is that in Figure 6 In the embodiment shown, each refrigerant branch is provided with a third sensor, namely Figure 6 The third sensors 611, 612, ..., 61N in.

[0121] For example, the third sensor on each refrigerant branch is used to collect the pressure value of the refrigerant in the refrigerant branch before entering the air-conditioning heat exchanger 60 .

[0122] For example, the air conditioner heat exchanger 60 includes at least one of an outdoor unit heat exchanger and an indoor unit heat exchanger.

[0123] For example, the outdoor unit heat exchanger and the indoor unit heat exchanger are liquid-cooled heat exchangers.

[0124] It should be noted here that under normal and high temperature conditions, the air conditioning performance can be further optimized by adjusting the condenser and evaporator.

[0125] It should be noted here that a sensor for detecting the pressure value of the refrigerant before it enters the air-conditioning heat exchanger is provided on the refrigerant branch so as to detect whether there is a problem of uneven liquid distribution in the branch.

[0126] For example, the third sensor may be a pressure sensor or a temperature sensor. In the case where the third sensor is a temperature sensor, the temperature value collected by the temperature sensor is converted into a corresponding pressure value.

[0127] In some embodiments, Figure 6 As shown, each refrigerant branch is provided with a fourth sensor, namely Figure 6 The fourth sensor 621, 622, ..., 62N in.

[0128] For example, the fourth sensor on each refrigerant branch is used to collect the pressure of the refrigerant in each refrigerant branch after leaving the air conditioner heat exchanger.

[0129] It should be noted here that a sensor for detecting the pressure value of the refrigerant after leaving the air-conditioning heat exchanger is provided on the refrigerant branch so as to detect whether there is a fault in the branch.

[0130] For example, the fourth sensor may be a pressure sensor or a temperature sensor. In the case where the fourth sensor is a temperature sensor, the temperature value collected by the temperature sensor is converted into a corresponding pressure value.

[0131] By implementing the above-mentioned embodiments of the present disclosure, the following beneficial effects can be obtained.

[0132] 1. Under low temperature conditions, the present invention can effectively reduce the low-temperature condensation heat exchange amount by adjusting the opening of the refrigerant branch, ensure that the condensation pressure is within a reasonable range, and ensure the life of the compressor.

[0133] 2. Under high temperature conditions, the present invention can effectively achieve uniform liquid separation, significantly improve the heat exchange capacity between the unit and the refrigerant, reduce the condensing pressure of the unit, and reduce the operating power of the unit.

[0134] 3. If a branch pipe is blocked or leaking, the present invention can detect and accurately determine the faulty branch pipe in real time, thereby improving the reliability of the liquid cooling module.

[0135] In some embodiments, the functional unit described above can be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any appropriate combination thereof for performing the functions described in the present disclosure.

[0136] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0137] The description of the present disclosure is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present disclosure to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present disclosure, and to enable those of ordinary skill in the art to understand the present disclosure and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A liquid separation control method, performed by a liquid separation control device, comprising: When the outdoor ambient temperature is lower than a first temperature threshold, receiving a suction pressure value of the compressor collected by a first sensor and a discharge pressure value of the compressor collected by a second sensor at a first predetermined period; When the ratio of the exhaust pressure value to the suction pressure value is not within the first predetermined range, the opening of the flow regulating valve on one of the N refrigerant branches passing through the outdoor unit heat exchanger is adjusted to adjust the ratio to within the first predetermined range, where N is a positive integer greater than 1.

2. The liquid separation control method according to claim 1, wherein: Among the N refrigerant branches, the heights of the first refrigerant branch to the Nth refrigerant branch decrease sequentially.

3. The liquid separation control method according to claim 2, wherein: The step of adjusting the opening of a flow control valve on one of the N refrigerant branches passing through the outdoor unit heat exchanger includes: When the ratio is less than the lower limit of the first predetermined range, querying the first refrigerant branch in the open state in order from the first refrigerant branch to the Nth refrigerant branch; If the i-th refrigerant branch is the first refrigerant branch in an open state, close the flow regulating valve on the i-th refrigerant branch, 1≤i≤N-1.

4. The liquid separation control method according to claim 3, wherein: The step of adjusting the opening of a flow control valve on one of the N refrigerant branches passing through the outdoor unit heat exchanger includes: If the 1st refrigerant branch to the N-1th refrigerant branch are all in a closed state, the compressor is controlled to stop.

5. The liquid separation control method according to claim 2, wherein: The step of adjusting the opening of a flow control valve on one of the N refrigerant branches passing through the outdoor unit heat exchanger includes: When the ratio is greater than the upper limit of the first predetermined range, querying the first refrigerant branch that is not in the maximum opening state in order from the Nth refrigerant branch to the first refrigerant branch; If the j-th refrigerant branch is the first refrigerant branch that is not in the maximum opening state, the flow regulating valve on the j-th refrigerant branch is maximized, 1≤j≤N.

6. The liquid separation control method according to claim 1, wherein: The upper limit value of the first predetermined range is a ratio of a predetermined high pressure protection parameter to a suction pressure value of the compressor.

7. The liquid separation control method according to any one of claims 1 to 6, further comprising: When the outdoor ambient temperature is greater than a second temperature threshold, receiving a first branch pressure value collected by a third sensor located on each refrigerant branch passing through the air-conditioning heat exchanger at a second predetermined period, wherein the first branch pressure value is a pressure value of the refrigerant in each refrigerant branch before entering the air-conditioning heat exchanger, and the second temperature threshold is greater than the first temperature threshold; Calculate the pressure average of the first branch pressure values ​​of the N refrigerant branches; When the difference between the pressure average value and the first branch pressure value of the kth refrigerant branch is not within the second predetermined range, adjust the opening of the flow control valve on the kth refrigerant branch to adjust the difference between the pressure average value and the first branch pressure value of the kth refrigerant branch to within the second predetermined range, 1≤k≤N.

8. The liquid separation control method according to claim 7, wherein: The step of adjusting the opening of the flow control valve on the kth refrigerant branch line includes: When the difference between the pressure average value and the first branch pressure value of the kth refrigerant branch is smaller than the lower limit of the second predetermined range, the opening of the flow regulating valve on the kth refrigerant branch is reduced.

9. The liquid separation control method according to claim 7, wherein: The step of adjusting the opening of the flow control valve on the kth refrigerant branch line includes: When the difference between the average pressure value and the first branch pressure value of the kth refrigerant branch is greater than the upper limit of the second predetermined range, the opening of the flow control valve on the kth refrigerant branch is increased.

10. The liquid dispensing control method according to claim 7, further comprising: When the outdoor ambient temperature is greater than a second temperature threshold, receiving a second branch pressure collected by a fourth sensor located on each refrigerant branch at the second predetermined period, wherein the second branch pressure is the pressure of the refrigerant in each refrigerant branch after leaving the air conditioner heat exchanger; Detect whether the pressure value of the second branch of the mth refrigerant branch is abnormal, where 1≤m≤N; When the pressure value of the second branch of the m-th refrigerant branch is abnormal, the flow regulating valve on the m-th refrigerant branch is closed and an alarm message is sent.

11. The liquid separation control method according to claim 10, wherein: The detecting whether the second branch pressure value of the mth refrigerant branch is abnormal comprises: Detecting whether the pressure value of the second branch of the m-th refrigerant branch is the atmospheric pressure value of the current environment; When the second branch pressure value of the m-th refrigerant branch is the atmospheric pressure value, it is determined that the second branch pressure value of the m-th refrigerant branch is abnormal.

12. The liquid separation control method according to claim 10, wherein: The detecting whether the second branch pressure value of the mth refrigerant branch is abnormal comprises: Calculating a pressure difference between a second branch pressure value of the m-th refrigerant branch and a first branch pressure value of the m-th refrigerant branch; Determining whether the pressure difference is less than a pressure difference threshold; When the pressure difference is less than the pressure difference threshold, it is determined that the second branch pressure value of the m-th refrigerant branch is abnormal.

13. The liquid separation control method according to claim 7, wherein: The air conditioner heat exchanger includes at least one of an outdoor heat exchanger and an indoor heat exchanger, and the outdoor heat exchanger and the indoor heat exchanger are liquid-cooled heat exchangers.

14. A liquid dispensing control device, comprising: Memory; A processor is coupled to the memory, and the processor is configured to execute the liquid dispensing control method according to any one of claims 1 to 13 based on instructions stored in the memory.

15. An air conditioner, comprising: The liquid dispensing control device according to claim 14; A first sensor is configured to collect a suction pressure value of the compressor; A second sensor is configured to collect an exhaust pressure value of the compressor; There are N refrigerant branches, wherein the N refrigerant branches pass through an outdoor unit heat exchanger, and each of the N refrigerant branches is provided with a flow regulating valve, and N is a positive integer greater than 1.

16. The air conditioner according to claim 15, further comprising: The third sensor disposed on each refrigerant branch is configured to collect the pressure value of the refrigerant in each refrigerant branch before entering the air-conditioning heat exchanger.

17. The air conditioner according to claim 16, further comprising: The fourth sensor disposed on each refrigerant branch is configured to collect the pressure of the refrigerant in each refrigerant branch after leaving the air-conditioning heat exchanger.

18. The air conditioner according to claim 16 or 17, wherein: The air conditioner heat exchanger includes at least one of an outdoor heat exchanger and an indoor heat exchanger, and the outdoor heat exchanger and the indoor heat exchanger are liquid-cooled heat exchangers.

19. A computer-readable storage medium, wherein: The computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the liquid dispensing control method as described in any one of claims 1 to 13 is implemented.

20. A computer program product, comprising computer instructions, wherein when the computer instructions are executed by a processor, the liquid dispensing control method according to any one of claims 1 to 13 is implemented.

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