air conditioning system

Abstract

This invention discloses an air conditioning system, comprising: an outdoor unit with an outdoor liquid pipe and an outdoor gas pipe; multiple indoor units with indoor liquid pipes and indoor gas pipes; a valve box with multiple pipeline connection assemblies, each including an electronic expansion valve; a controller configured to determine the currently detected pipeline connection assembly; the controller configured to record the circuit connection address of the indoor unit corresponding to the currently detected pipeline connection assembly; the controller configured to record the refrigerant pipeline connection address of the indoor unit corresponding to the currently detected pipeline connection assembly; and the controller configured to output a detection result based on the circuit connection address and the refrigerant pipeline connection address. The detection result is used to display whether the detection is qualified and to display the address of the indoor unit with incorrect connection. This system achieves automatic detection of piping and wiring in the valve box of the air conditioning system, improving detection efficiency and providing correct connection modification solutions.

Description

Technical Field

[0001] This invention relates to air conditioners, and more particularly to an air conditioning system. Background Technology

[0002] Air conditioners are common household appliances. They typically consist of an indoor unit and an outdoor unit, with the indoor unit installed indoors and the outdoor unit outdoors. For air conditioning systems with one outdoor unit connecting multiple indoor units, a valve box is usually installed to facilitate the piping and communication connections between the indoor and outdoor units. In systems with valve boxes, the outdoor unit is connected to the valve box, and the valve box is connected to the indoor units via refrigerant piping, significantly increasing system complexity. During actual installation, errors in the connection between the valve box and the piping (i.e., inconsistencies between the communication line and the connecting pipe) frequently occur. Once a piping connection error is discovered, each pipe must be checked individually, making the repair process cumbersome.

[0003] Chinese Patent Publication No. CN104676818A discloses a method for detecting installation errors in multi-split air conditioners. The method involves sequentially turning on multiple indoor units for cooling or heating, and after a preset time, detecting the temperature change of the heat exchanger of the corresponding indoor unit or other indoor units. This temperature change is then compared to a preset target temperature, and the comparison result is used to determine whether the indoor unit is installed incorrectly. However, this method only displays an error code when an incorrect indoor unit is detected; it cannot determine how to correct the connection.

[0004] Therefore, this paper addresses how to provide an automatic detection solution for the piping and wiring of valve boxes in air conditioning systems to improve detection efficiency and provide correct connection modification solutions. Summary of the Invention

[0005] In response to the problems mentioned in the background art, the present invention proposes an air conditioning system that enables automatic detection of piping and wiring in the valve box of the air conditioning system to improve detection efficiency and provide correct connection modification solutions.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution: In some embodiments of this application, an air conditioning system is provided, including: An outdoor unit for an air conditioner, wherein the outdoor unit is equipped with an outdoor unit liquid pipe and an outdoor unit gas pipe; Multiple indoor air conditioning units, each indoor air conditioning unit being equipped with an indoor unit liquid pipe and an indoor unit gas pipe; A valve box is provided with multiple pipeline connection assemblies, each including an electronic expansion valve; the indoor unit liquid pipe is connected to the outdoor unit liquid pipe, the indoor unit gas pipe is connected to the electronic expansion valve in the pipeline connection assembly, and the electronic expansion valve is connected to the outdoor unit gas pipe; the air conditioner indoor unit is electrically connected to the corresponding electronic expansion valve in the pipeline connection assembly. The controller is electrically connected to the indoor unit of the air conditioner; The controller is configured to record the circuit connection address of the indoor unit of the air conditioner corresponding to the pipeline connection assembly; The controller is configured to record the refrigerant pipeline connection address of the indoor unit of the air conditioner corresponding to the pipeline connection assembly; The controller is configured to output a detection result based on the circuit connection address and the refrigerant pipeline connection address; the detection result is used to display whether the detection is qualified and to display the address of the air conditioner indoor unit with incorrect connection.

[0007] Compared with the prior art, the advantages and positive effects of the present invention are as follows: By recording the circuit connection address and refrigerant pipeline connection address of the air conditioner indoor unit connected to the pipeline connection component by the controller, the information of the air conditioner indoor unit connected to the communication line interface and the air conditioner indoor unit connected to the piping line interface on the corresponding pipeline connection component can be detected. By comparing whether the information of the air conditioner indoor unit connected to the communication line interface is consistent with the information of the air conditioner indoor unit connected to the piping line interface, it is possible to accurately determine whether the piping line on the pipeline connection component is wired correctly. Furthermore, the operator can accurately know the connection relationship of the circuit and refrigerant pipeline of the incorrectly wired air conditioner indoor unit through the information of the air conditioner indoor unit connected to the corresponding pipeline connection component, so as to facilitate the operator to accurately check and adjust the circuit and refrigerant pipeline, thereby achieving automatic detection of the piping and wiring of the valve box in the air conditioning system and improving detection efficiency.

[0008] In some embodiments of this application, the controller is configured to determine the currently detected pipeline connection component; Record the circuit connection address of the indoor unit of the air conditioner corresponding to the currently detected pipeline connection component; Switch to the pipeline connection component to be tested and record the corresponding circuit connection address of the indoor air conditioning unit.

[0009] When the communication line connection address of each indoor air conditioning unit in the pipeline connection assembly is not determined, it is necessary to first determine the pipeline connection assembly currently being tested. After the first pipeline connection assembly completes the recording, the process is switched to other pipeline connection assemblies for recording, thereby completing the recording and testing of the communication line connection address in the air conditioning system.

[0010] In some embodiments of this application, the electronic expansion valve includes a first expansion valve and a second expansion valve; The outdoor unit air pipe includes an outdoor unit low-pressure air pipe and an outdoor unit high-pressure air pipe; The indoor unit's gas pipe is respectively connected to the first expansion valve and the second expansion valve in the corresponding pipeline connection assembly. The first expansion valve is connected to the low-pressure gas pipe of the outdoor unit, and the second expansion valve is connected to the high-pressure gas pipe of the outdoor unit. The air conditioner's indoor unit is electrically connected to the first expansion valve and the second expansion valve in the corresponding pipeline connection assembly. The controller is configured to identify the pipeline connection assembly currently being detected as one where the first expansion valve is in the open state and the second expansion valve changes from the open state to the closed state during the detection process.

[0011] The first expansion valve and the second expansion valve are configured to meet the piping connection requirements of the low-pressure and high-pressure gas pipes of the indoor and outdoor units of the air conditioner. Furthermore, during testing, the piping connection assembly to be tested is determined by the on / off state of the first expansion valve and the second expansion valve in the piping connection assembly.

[0012] In some embodiments of this application, the controller is configured to send a cooling operation signal to all indoor air conditioning units; After running for the first preset time, a shutdown signal is sent to all indoor air conditioning units. Send a heating operation signal to any indoor air conditioning unit; record the on / off status of each electronic expansion valve in the valve box, and identify the pipeline connection assembly where the first expansion valve is in the open state and the second expansion valve changes from the open state to the closed state as the currently detected pipeline connection assembly.

[0013] Each pipe connection assembly within the valve box connects to indoor air conditioning units that can only operate in either heating or cooling mode simultaneously. The system controls each indoor unit to first operate in cooling mode and then shut down. During this process, the electronic expansion valve maintains a slight opening, producing a cooling effect. Then, the controller sends a heating signal to any indoor unit. This causes a change in the on / off state of the first and second expansion valves corresponding to the unit operating in heating mode. By identifying the first and second expansion valves whose on / off states have changed, the currently detected pipe connection assembly can be determined, allowing for the detection of the connections between the corresponding indoor units within that assembly.

[0014] In some embodiments of this application, the controller is configured to record the address of the indoor unit whose state changes from cooling stop to heating stop, and the indoor unit address is the circuit connection address of each indoor unit in the currently detected pipeline connection assembly.

[0015] For air conditioning indoor units connected in the same pipeline connection assembly, only the same operating instructions can be executed. When the controller sends a heating instruction to any air conditioning indoor unit in the currently detected pipeline connection assembly, the other air conditioning indoor units in the same pipeline connection assembly are in a heating stopped state. Therefore, by recording the address of the air conditioning indoor unit whose state changes from cooling stopped to heating stopped, the circuit connection address of each corresponding air conditioning indoor unit in the currently detected pipeline connection assembly can be obtained.

[0016] In some embodiments of this application, the controller is configured to send a heating stop command to all indoor air conditioning units; Referring to the recorded circuit connection addresses, heating commands are sent sequentially to any indoor air conditioning unit of each pipeline connection component; Record the liquid pipe temperature T of each indoor air conditioner unit before any indoor unit issues a heating operation signal. I,t-1 (n) and the temperature of the air conditioner indoor unit pipe T g,t-1 (n); Record the liquid pipe temperature T of each indoor air conditioner unit after any indoor air conditioner unit executes the heating operation signal. I,t (n) and the temperature of the air conditioner indoor unit pipe T g,t (n); Calculate the gas pipe temperature difference ΔT for each indoor air conditioner unit. g (n) and the change in temperature difference ΔT between the gas and liquid pipes g,t (n); When the tracheal temperature difference ΔT g (n) is greater than the first preset difference and the change in temperature difference ΔT between the gas and liquid pipes g,t (n) When the difference is greater than the second preset value, the address of the indoor unit of the air conditioner is recorded as the refrigerant pipe connection address of the indoor unit of the air conditioner corresponding to the currently detected pipe connection component; n represents the address of the indoor unit of the air conditioner.

[0017] By analyzing the temperature changes in the indoor unit's gas pipe and return air temperature caused by the changes in the electronic expansion valve before and after controlling any indoor air conditioner unit to execute the heating operation signal, the algorithm achieves the technical effect of indirectly judging the pipe connection relationship through temperature parameters, so as to realize the convenient and accurate detection of the correctness of the refrigerant pipe connection.

[0018] In some embodiments of this application, the controller is configured to record the average exhaust temperature Tdini of the outdoor unit of the air conditioner, and record the average exhaust temperature Tdend of the outdoor unit of the air conditioner after a second preset time. The controller is configured to determine whether the detection conditions are qualified based on the formula |Tdend-Tdini|≤ a third preset difference. If the formula is true, the test conditions are deemed to be qualified. Then, the connection relationship of the current pipeline connection components is determined to be correct based on whether the recorded circuit connection address and refrigerant pipeline connection address are consistent. If the formula is not valid, the testing conditions are deemed unqualified, the currently tested pipeline connection component is marked as unqualified for the first time, and the testing of the next pipeline connection component is carried out.

[0019] When the temperature of the indoor unit's gas pipe fluctuates too much due to excessive exhaust temperature fluctuations in the air conditioning system, misjudgments are likely to occur. By adding judgment and detection conditions, and determining that the exhaust temperature fluctuations of the air conditioning system are within a set range, the correctness of the connection between the communication line and the refrigerant pipeline can be checked and judged. This can accurately determine the stable state of the system, thereby improving the technical effect of judgment accuracy.

[0020] In some embodiments of this application, the controller is configured to display non-compliance information when the pipeline connection assembly fails to meet the detection conditions twice; The controller is also configured to display whether the connection relationship of the pipeline connection assembly is correct when the second detection condition of the pipeline connection assembly is qualified.

[0021] By re-evaluating the testing conditions of pipeline connection components that initially failed the test, false detections caused by pressure changes can be avoided, thereby improving the accuracy and convenience of maintenance and testing.

[0022] In some embodiments of this application, the controller is configured to, when the detection conditions are met, if the circuit connection address and refrigerant pipe connection address of each corresponding air conditioner indoor unit in the currently detected pipeline connection assembly are consistent, then display a prompt message indicating that the corresponding pipeline connection assembly is correctly connected; if the circuit connection address and refrigerant pipe connection address of each corresponding air conditioner indoor unit in the currently detected pipeline connection assembly are inconsistent, then display the address of the air conditioner indoor unit whose circuit connection address and refrigerant pipe connection address are inconsistent.

[0023] By directly displaying the address of the indoor unit connected to the incorrectly connected pipeline assembly, operators can more accurately adjust the connection between the indoor unit's communication line and the refrigerant pipeline based on the same indoor unit address detected in different pipeline assembly components.

[0024] In some embodiments of this application, the controller is configured to determine an indoor air conditioner whose circuit connection address or refrigerant pipeline connection address appears only once during the connection relationship detection process as a refrigerant pipeline cut-off or blockage.

[0025] If the problem is determined to be a blockage or interruption in the refrigerant line of the indoor unit, the system will alert the operator to the blockage or interruption in the refrigerant line of the corresponding indoor unit, so that the operator can carry out timely maintenance.

[0026] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. 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.

[0028] Figure 1 This is one of the schematic diagrams of an embodiment of the air conditioning system of the present invention; Figure 2 This is a second schematic diagram of an embodiment of the air conditioning system of the present invention; Figure 3 This is one of the detection flowcharts of an embodiment of the air conditioning system of the present invention; Figure 4 This is a second flowchart of the detection process of an embodiment of the air conditioning system of the present invention; Figure 5 This is the third flowchart of the detection process of an embodiment of the air conditioning system of the present invention; Figure 6 This is the fourth flowchart of the detection process of an embodiment of the air conditioning system of the present invention; Figure 7 This is the fourth flowchart of the detection process for an embodiment of the air conditioning system of the present invention.

[0029] Explanation of reference numerals in the attached figures: 1. Outdoor unit of air conditioner; 11. Liquid pipe of outdoor unit; 12. Gas pipe of outdoor unit; 121. Low-pressure gas pipe for outdoor unit; 122. High-pressure gas pipe for outdoor unit; 2. Indoor unit of air conditioner; 21. Liquid pipe of indoor unit; 22. Gas pipe of indoor unit; 3. Valve box; 31. Electronic expansion valve; 30. Pipeline connection assembly; 311. First expansion valve; 312. Second expansion valve. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In this application, the air conditioner performs a refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0032] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0033] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0034] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0035] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0036] like Figure 1 As shown, one embodiment of this application provides an air conditioning system, including: An outdoor unit 1 for an air conditioner is provided with an outdoor unit liquid pipe 11 and an outdoor unit gas pipe 12. Multiple air conditioning indoor units 2, each air conditioning indoor unit 2 is equipped with an indoor unit liquid pipe 21 and an indoor unit gas pipe 22; A valve box 3 is provided with multiple pipeline connection assemblies 30, each pipeline connection assembly 30 including an electronic expansion valve 31; the indoor unit liquid pipe 21 is connected to the outdoor unit liquid pipe 11, the indoor unit gas pipe 22 is connected to the corresponding electronic expansion valve 31 in the pipeline connection assembly 30, and the electronic expansion valve 31 is connected to the outdoor unit gas pipe 12; the air conditioner indoor unit 2 is electrically connected to the corresponding electronic expansion valve 31 in the pipeline connection assembly 30. The controller is electrically connected to the indoor unit 2 of the air conditioner; The controller is configured to record the circuit connection address of the indoor unit 2 of the air conditioner corresponding to the pipeline connection assembly 30; The controller is configured to record the refrigerant pipeline connection address of the indoor unit 2 of the air conditioner corresponding to the pipeline connection assembly 30; The controller is configured to output a detection result based on the circuit connection address and the refrigerant pipeline connection address; the detection result is used to display whether the detection is qualified and to display the address of the air conditioner indoor unit with incorrect connection.

[0037] Specifically, the air conditioning system includes at least one outdoor unit 1 and multiple indoor units 2. The communication line, liquid pipe 21 and gas pipe 22 of the indoor unit 2 are respectively connected to the corresponding pipeline connection assembly 30, so as to connect with the outdoor unit liquid pipe 11 and outdoor unit gas pipe 12 of the outdoor unit 1 through the pipeline connection assembly 30.

[0038] After completing the connection of the communication line and refrigerant pipeline, the circuit connection relationship and refrigerant pipeline connection relationship between the indoor unit 2 of the air conditioner and the pipeline connection assembly 30 can be tested.

[0039] like Figure 3 As shown, the controller executes step S1, recording the circuit connection address of the indoor unit 2 corresponding to the pipeline connection assembly 30. The indoor unit transmits its operating mode and parameters to the pipeline connection assembly 30 via the communication line. Based on this, the pipeline connection assembly 30 controls the electronic expansion valve 31 of the corresponding branch to operate, thereby recording the circuit connection relationship between the pipeline connection assembly 30 and the corresponding indoor unit 2. Then, the controller executes step S2, recording the refrigerant pipeline connection address of the indoor unit 2 corresponding to the pipeline connection assembly 30. The refrigerant pipeline connection address of the indoor unit 2 can be determined based on the temperature change during heating or cooling operation.

[0040] After obtaining the circuit connection address and refrigerant pipeline connection address of the air conditioner indoor unit 2 corresponding to the currently detected pipeline connection component 30, the controller executes step S3, outputting the detection result according to the circuit connection address and the refrigerant pipeline connection address, that is, determining whether the communication line and refrigerant pipeline of the air conditioner indoor unit 2 are connected together with the same pipeline connection component 30.

[0041] When the communication line and refrigerant line connected by the pipeline connection component 30 do not belong to the same indoor air conditioning unit 2, the operator can easily make adjustments according to the communication line and refrigerant line of the indoor air conditioning unit 2 connected by the pipeline connection component 30, so as to facilitate the operator to perform maintenance and adjustment conveniently.

[0042] Compared with the prior art, the advantages and positive effects of the present invention are as follows: By recording the circuit connection address and refrigerant pipeline connection address of the air conditioner indoor unit connected to the pipeline connection component 30 by the controller, the information of the air conditioner indoor unit connected to the communication line interface and the air conditioner indoor unit connected to the piping line interface on the corresponding pipeline connection component 30 can be detected. By comparing whether the information of the air conditioner indoor unit connected to the communication line interface is consistent with the information of the air conditioner indoor unit connected to the piping line interface, it is possible to accurately determine whether the piping line on the pipeline connection component 30 is wired correctly. Furthermore, the operator can accurately know the connection relationship of the circuit and refrigerant pipeline of the incorrectly wired air conditioner indoor unit through the information of the air conditioner indoor unit connected to the corresponding pipeline connection component 30, so as to facilitate the operator to accurately check and adjust the circuit and refrigerant pipeline, thereby achieving automatic detection of the piping and wiring of the valve box in the air conditioning system and improving detection efficiency.

[0043] In some embodiments of this application, the controller is configured to determine the currently detected pipeline connection assembly 30; Record the circuit connection address of the air conditioner indoor unit 2 corresponding to the currently detected pipeline connection component 30; Switch to the pipeline connection assembly 30 to be tested and record its corresponding circuit connection address of the indoor air conditioning unit 2.

[0044] When the communication line connection address of each indoor air conditioning unit in the pipeline connection assembly is not determined, it is necessary to first determine the pipeline connection assembly currently being tested. After the first pipeline connection assembly completes the recording, the process is switched to other pipeline connection assemblies for recording, thereby completing the recording and testing of the communication line connection address in the air conditioning system.

[0045] Specifically, refer to Figure 4As shown, the controller is configured to execute step S11 to determine the currently detected pipeline connection component 30. In this embodiment, when the communication line connection address of the air conditioner indoor unit is uncertain, any air conditioner indoor unit is selected to execute the corresponding instruction, thereby determining the first pipeline connection component 30 to be detected.

[0046] The controller is configured to execute step S12, recording the circuit connection address of the air conditioner indoor unit 2 corresponding to the currently detected pipeline connection component 30; After recording the communication line address of the first pipeline connection component 30, the controller is configured to execute step S13, and then switch to other undetected pipeline connection components 30 to record their communication line addresses, until all pipeline connection components have been traversed. This completes the recording of the circuit connection addresses, i.e., the communication line addresses, of all indoor air conditioning units 2 in the air conditioning system.

[0047] In some embodiments of this application, such as Figure 2 As shown, the electronic expansion valve 31 includes a first expansion valve 311 and a second expansion valve 312; The outdoor unit air pipe 12 includes an outdoor unit low-pressure air pipe 121 and an outdoor unit high-pressure air pipe 122. The indoor unit gas pipe 22 is respectively connected to the first expansion valve 311 and the second expansion valve 312 in the corresponding pipeline connection assembly 30. The first expansion valve 311 is connected to the low-pressure gas pipe 121 of the outdoor unit, and the second expansion valve 312 is connected to the high-pressure gas pipe 122 of the outdoor unit. The air conditioner indoor unit 2 is electrically connected to the first expansion valve 311 and the second expansion valve 312 in the corresponding pipeline connection assembly 30. The controller is configured to identify the pipeline connection assembly 30 currently being detected when the first expansion valve 311 is in the open state and the second expansion valve 312 changes from the open state to the closed state.

[0048] Specifically, there are two electronic expansion valves 31, namely a first expansion valve 311 and a second expansion valve 312; the outdoor unit air pipe 12 includes an outdoor unit low-pressure air pipe 121 and an outdoor unit high-pressure air pipe 122; the indoor unit air pipe 22 is connected to the outdoor unit low-pressure air pipe 121 through the first expansion valve 311, and the indoor unit air pipe 22 is connected to the outdoor unit high-pressure air pipe 122 through the second expansion valve 312.

[0049] The first expansion valve 311 and the second expansion valve 312 are configured to meet the piping connection requirements of the low-pressure and high-pressure gas pipes of the indoor unit 2 and the outdoor unit of the air conditioner. Furthermore, during testing, the pipeline connection assembly 30 to be tested is determined by the on / off state of the first expansion valve 311 and the second expansion valve 312 in the pipeline connection assembly 30.

[0050] In some embodiments of this application, the controller is configured to send a cooling operation signal to all indoor air conditioning units 2; After running for the first preset time, a shutdown signal is sent to all indoor air conditioning units 2. Send a heating operation signal to any indoor air conditioning unit 2; record the on / off status of each electronic expansion valve 31 in the valve box, and identify the pipeline connection assembly 30 where the first expansion valve 311 is in the open state and the second expansion valve 312 changes from the open state to the closed state as the currently detected pipeline connection assembly 30.

[0051] In some embodiments, the first preset time is an empirical value obtained after multiple trials.

[0052] Each indoor air conditioning unit connected to each pipeline connection assembly 30 within the valve box can only simultaneously perform either heating or cooling. The control system ensures that each indoor unit first performs cooling and then stops. During this process, the electronic expansion valve 31 maintains a slight opening, producing a certain cooling effect. This provides a basis for determining the pipeline connection assembly 30 to be detected. Then, the controller sends a heating signal to any indoor air conditioning unit. At this time, the switching states of the first expansion valve 311 and the second expansion valve 312 corresponding to the indoor unit executing the heating signal change. By identifying the first expansion valve 311 and the second expansion valve 312 whose switching states have changed, the currently detected pipeline connection assembly 30 can be determined, and the connections of each indoor air conditioning unit corresponding to that pipeline connection assembly 30 can be detected.

[0053] In this embodiment, the process by which the controller determines the currently detected pipeline connection assembly 30 is referred to... Figure 5 As shown, the controller executes step S111: sending a cooling operation signal to all indoor air conditioning units 2; then executes step S112: after running for a first preset time, the controller sends a cooling stop signal to all indoor air conditioning units 2.

[0054] At this time, all indoor air conditioning units are in a cooling-stop state. Then, the controller executes step S113: a heating command can be sent to any indoor air conditioning unit 2. In order to execute the heating command, the states of the corresponding first expansion valve 311 and second expansion valve 312 of the indoor air conditioning unit 2 will change. The controller executes step S114, and by recording that the first expansion valve 311 is in an open state and the second expansion valve 312 is in a closed state, the corresponding pipeline connection assembly 30 is the pipeline connection assembly 30 currently being detected.

[0055] In some embodiments, once the currently detected pipeline connection component 30 has completed the detection, it can be marked as detected, and the controller can then send a heating command to any other air conditioning indoor unit 2 other than the air conditioning indoor unit 2 corresponding to the communication line of the detected pipeline connection component 30.

[0056] In some embodiments, if the pipeline connection component 30 being tested is the first pipeline connection component 30 to be tested in this testing procedure, then after the controller sends a heating command to any of its indoor air conditioning units 2, it is necessary to wait for a second preset time before recording the status of the first expansion valve 311 and the second expansion valve 312.

[0057] In some embodiments, the second preset time is an empirical value obtained after multiple trials.

[0058] In some embodiments, reference is made to Figure 1 As shown, for a valve box that only cuts off the circuit, it does not have a first expansion valve 311 and a second expansion valve 312; at this time, the detected branch can be found by reverse-engineering the communication address from the indoor unit address that receives the heating signal from the indoor unit.

[0059] In some embodiments of this application, the controller is configured to record the address of the indoor unit whose state changes from cooling stop to heating stop. This indoor unit address is the circuit connection address of each indoor unit in the currently detected pipeline connection assembly 30.

[0060] For air conditioning indoor units connected in the same pipeline connection assembly 30, only the same operating command can be executed. When the controller sends a heating command to any air conditioning indoor unit in the currently detected pipeline connection assembly 30, the other air conditioning indoor units in the same pipeline connection assembly 30 are in a heating stop state. Therefore, by recording the address of the air conditioning indoor unit whose state changes from cooling stop to heating stop, the circuit connection address of each corresponding air conditioning indoor unit in the currently detected pipeline connection assembly 30 can be obtained.

[0061] In some embodiments of this application, the controller is configured to send a heating stop command to all indoor air conditioning units; Referring to the recorded circuit connection addresses, heating commands are sent sequentially to any indoor air conditioning unit of each pipeline connection component; Record the liquid pipe temperature T of each indoor air conditioner unit before any indoor unit issues a heating operation signal. I,t-1 (n) and the temperature of the air conditioner indoor unit pipe T g,t-1 (n); Record the liquid pipe temperature T of each indoor air conditioner unit after any indoor air conditioner unit executes the heating operation signal. I,t (n) and the temperature of the air conditioner indoor unit pipe T g,t (n); Calculate the gas pipe temperature difference ΔT for each indoor air conditioner unit. g (n) and the change in temperature difference ΔT between the gas and liquid pipes g,t (n); When the tracheal temperature difference ΔT g (n) is greater than the first preset difference and the change in temperature difference ΔT between the gas and liquid pipes g,t When (n) is greater than the second preset difference, the address of the indoor unit of the air conditioner is recorded as the refrigerant pipeline connection address of the indoor unit of the air conditioner corresponding to the currently detected pipe connection component.

[0062] When detecting the refrigerant pipe connection address, first adjust the status of all indoor air conditioning units 2 to the heating stop state. Then, use the temperature change of the indoor unit gas pipe and the return air temperature caused by the change of the electronic expansion valve 31 before and after controlling any indoor air conditioning unit to execute the heating operation signal as response features for algorithm analysis. This achieves the technical effect of indirectly judging the pipe connection relationship through temperature parameters, so as to realize the convenient and accurate detection of the correctness of the refrigerant pipe connection.

[0063] In some embodiments, the first preset difference and the second preset difference are both empirical values ​​obtained after multiple trials.

[0064] In some embodiments, since the correctness of refrigerant piping connections is detected based on temperature changes, the liquid pipe temperature T of each indoor air conditioning unit is recorded before the controller sends the heating command. I,t-1 (n) and the temperature of the air conditioner indoor unit pipe T g,t-1 (n); to serve as a reference basis for the subsequent inspection of the correctness of the refrigerant pipeline connection of each pipeline connection component 30.

[0065] Specifically, refer to Figure 6 The controller executes step S21: sending a heating stop command to all indoor air conditioning units; Then proceed to step S22: record the liquid pipe temperature T of each indoor air conditioning unit 2. I,t-1 (n) and the temperature of the air conditioner indoor unit pipe T g,t-1 (n), where t-1 represents the time before the heating command is executed; n represents the address of the indoor unit 2 of the air conditioner. In this embodiment, the address of the indoor unit 2 of the air conditioner is the number of the indoor unit.

[0066] The controller executes step S23: referring to the recorded circuit connection address, it sends heating commands to any indoor air conditioning unit of each pipeline connection component in turn; When an indoor unit 2 of an air conditioner executes a heating command, step S24 is executed: record the liquid pipe temperature T of each indoor unit 2. I,t (n) and the temperature of the air conditioner indoor unit pipe T g,t (n). Where t represents the time after the heating command is executed.

[0067] The controller executes step S25: Calculate the gas pipe temperature difference ΔT for each indoor air conditioning unit. g (n), the formula for calculating the tracheal temperature difference is ΔT. g (n)= T g,t (n)- T g,t-1 (n); The formula for calculating the temperature difference change in the gas-liquid pipe is ΔT. g,t (n)=(T g,t (n)-T I,t (n))-(T g,t-1 (n)- T I,t-1 (n)).

[0068] The controller executes step S26: according to the formula for the airway temperature difference ΔT g (n) > the first preset difference and the change in temperature difference ΔT between the gas and liquid pipes g,t When (n) > the second preset difference, the address of the indoor unit of the air conditioner is recorded as the refrigerant pipeline connection address of the indoor unit of the air conditioner corresponding to the currently detected pipe connection component.

[0069] Specifically, during the operation of the air conditioning system, when the indoor unit 2 executes the heating command, the change of the electronic expansion valve 31 can cause changes in the temperature of the indoor unit's gas pipe and the return air temperature. By using the temperature change as a response feature for algorithm analysis, the connection address of the refrigerant pipe of the indoor unit 2 in the currently detected pipeline connection component 30 can be obtained.

[0070] In some embodiments, after obtaining the circuit connection address and refrigerant pipeline connection address of the air conditioner indoor unit 2 corresponding to the current pipeline connection assembly 30, a pass / fail judgment is first performed to improve the accuracy of the detection. If the detection is qualified, then it is determined whether the circuit connection address and refrigerant pipeline connection address of the air conditioner indoor unit 2 are correct.

[0071] In some embodiments of this application, after the controller completes step S2, it is configured to record the average exhaust temperature Tdini of the outdoor unit of the air conditioner, and record the average exhaust temperature Tdend of the outdoor unit of the air conditioner after a second preset time. The controller is configured to determine whether the detection conditions are qualified based on the formula |Tdend-Tdini|≤ a third preset difference. If the formula is true, the test conditions are deemed to be qualified. Then, the connection relationship of the current pipeline connection component 30 is determined to be correct based on whether the recorded circuit connection address and refrigerant pipeline connection address are consistent. If the formula is not valid, the test conditions are deemed unqualified, the pipeline connection component 30 being tested is marked as unqualified for the first time, and the next pipeline connection component 30 is tested.

[0072] Specifically, during the testing process, it is first determined whether the testing conditions are qualified. If qualified, the circuit connection address and refrigerant pipeline connection address of the already collected indoor air conditioning unit 2 are compared and judged. When the absolute value of the difference between Tdend and Tdini does not exceed the third preset difference value, the testing conditions are determined to be qualified, and then the circuit connection address and refrigerant pipeline connection address are compared and judged. If the testing conditions are not qualified, the pipeline connection component 30 being tested is marked as initially unqualified, and the next pipeline connection component 30 is tested.

[0073] In some embodiments, if the pipeline connection assembly 30 being inspected is being inspected for the first time, then after all pipeline connection assemblies 30 have been inspected, the pipeline connection assembly 30 that fails the inspection will be inspected a second time. That is, the pipeline connection assembly 30 marked as failing the initial inspection will be inspected again.

[0074] Indoor units with communication lines and piping connections on the same branch that passed the initial inspection will no longer be tested.

[0075] When the temperature of the indoor unit's gas pipe fluctuates too much due to excessive exhaust temperature fluctuations in the air conditioning system, misjudgments are likely to occur. By adding judgment and detection conditions, and determining that the exhaust temperature fluctuations of the air conditioning system are within a set range, the correctness of the connection between the communication line and the refrigerant pipeline can be checked and judged. This can accurately determine the stable state of the system, thereby improving the technical effect of judgment accuracy.

[0076] In some embodiments, the third preset difference is taken as an empirical value obtained from multiple trials.

[0077] In some embodiments of this application, the controller is configured to display non-compliance information when the pipeline connection assembly 30 fails to meet the detection conditions twice; The controller is also configured to display whether the connection relationship of the pipeline connection assembly 30 is correct when the second detection condition of the pipeline connection assembly 30 is qualified.

[0078] Specifically, during the testing process, if both testing conditions fail, the controller outputs a test result showing that the corresponding pipeline connection component 30 is in a failed testing state.

[0079] In some embodiments, the detection result is indicated by the code "FF" to indicate a detection failure.

[0080] If the second test conditions are met, the connection relationship will continue to be determined based on the circuit connection address and refrigerant pipeline connection address of each indoor air conditioning unit in the pipeline connection assembly 30 being tested.

[0081] By re-evaluating the testing conditions of pipeline connection components 30 that initially failed the test, false detections caused by pressure changes are avoided, thereby improving the accuracy and convenience of maintenance and testing.

[0082] In some embodiments of this application, the controller is configured to, when the detection conditions are met, if the circuit connection address and refrigerant pipeline connection address of each corresponding air conditioner indoor unit in the currently detected pipeline connection assembly 30 are consistent, then display a prompt message indicating that the pipeline connection assembly 30 is correctly connected; if the circuit connection address and refrigerant pipeline connection address of each corresponding air conditioner indoor unit in the currently detected pipeline connection assembly 30 are inconsistent, then display the address of the air conditioner indoor unit whose circuit connection address and refrigerant pipeline connection address are inconsistent.

[0083] Specifically, refer to Figure 7 As shown, for pipeline connection components 30 that pass the initial test or the second test, the controller is configured to execute step S31: compare the circuit connection address and refrigerant pipeline address detected by each pipeline connection component 30.

[0084] The controller executes step S32: when its circuit connection address and refrigerant pipeline address are consistent, it displays a prompt message indicating that the corresponding pipeline connection component 30 is connected correctly, that is, the output detection result is that the connection is correct.

[0085] In some embodiments, the detection result is indicated by the code "SS" to indicate a correct connection.

[0086] The controller executes step S33: When its circuit connection address and refrigerant pipeline address are consistent, it displays the address of the indoor air conditioner unit where the circuit connection address and refrigerant pipeline connection address are inconsistent.

[0087] In some embodiments, if multiple indoor air conditioning units 2 in the currently detected pipeline connection assembly 30 have inconsistent addresses, the multiple addresses are arranged sequentially.

[0088] By directly displaying the address of the indoor unit connected to the incorrectly connected pipeline connection component 30, operators can more accurately adjust the connection relationship between the communication line of the indoor unit and the refrigerant pipeline based on the same indoor unit address detected in different pipeline connection components 30.

[0089] In some embodiments of this application, the controller is configured to determine an indoor air conditioner whose circuit connection address or refrigerant pipeline connection address appears only once during the connection relationship detection process as a refrigerant pipeline cut-off or blockage.

[0090] Specifically, after testing each pipeline connection assembly 30, if the refrigerant pipe of a certain indoor air conditioner unit 2 is cut off or blocked, the temperature of the indoor unit gas pipe 22 of that indoor unit 2 will not change significantly during the testing process due to the cut-off or blockage of the refrigerant pipe. Consequently, it will be impossible to pair the indoor unit 2 with the pipeline connection assembly 30. After the testing is completed, information on the refrigerant pipe connection relationship of that indoor unit 2 will be missing.

[0091] If the problem is determined to be a blockage or interruption in the refrigerant line of the indoor unit, the system will alert the operator to the blockage or interruption in the refrigerant line of the corresponding indoor unit, so that the operator can carry out timely maintenance.

[0092] In some embodiments, when connection detection begins, it is first determined that all indoor air conditioning units are in a stopped state and the DSW4-1 switch is changed from OFF to ON.

[0093] In some embodiments, after the controller enters the detection process, the air conditioning system's display mode displays "PC" via a seven-segment code, indicating that the detection is in progress.

[0094] In some embodiments, when all pipeline connection components 30 pass the first test or all pipeline connection components 30 that fail the first test complete the second test, the air conditioning system's display mode will no longer display "PC" via the seven-segment code, indicating that the test is complete, and the cooling trial run can be terminated at this time.

[0095] In some embodiments, the controller is also configured to set termination conditions for the detection function.

[0096] The controller will exit connection detection if any of the following conditions are met: (1) If the DSW4-1 setting is changed to OFF during the test, the process will be terminated and the air conditioning system will no longer display "PC" via the seven-segment code.

[0097] (2) If any alarm signal or shutdown reason code is found in the outdoor unit, indoor unit or valve box itself during the test, the connection test function will be terminated and the air conditioning system display mode will no longer display "PC" and will display an abnormal code via the seven-segment code.

[0098] The DSW4-1 DIP switch needs to be switched back to OFF. After the alarm is cleared, if piping connection testing is still required, the switch must be reset and a trial run must be performed to start the testing process.

[0099] In some embodiments, the connection test results of each pipeline connection component 30 are viewed by flipping through PSW2 (↑) and PSW3 (↓). Scrolling down sequentially displays the pipeline connection component 30 codes (J1~J4) and the test results.

[0100] For example: Case 1: Detection successful (the pipeline connection component 30 has passed the detection conditions at least once and the communication line is correctly connected to the refrigerant pipeline), the output detection result shows SS.

[0101] When the indoor unit address of the refrigerant pipeline detected by the first pipeline connection assembly 30 is completely consistent with the indoor unit address of the communication line, it will display as SS, indicating that the piping connection of the first pipeline connection assembly 30 is correct.

[0102] The second scenario: The test is successful (the pipeline connection component 30 has passed the test conditions at least once, but the communication line is connected to the refrigerant pipeline incorrectly), and the output test result shows the indoor address where the connection is incorrect.

[0103] When the communication line of indoor unit No. 8 is connected to the second pipeline connection assembly 30, and the refrigerant line of indoor unit No. 8 is mistakenly connected to the third pipeline connection assembly 30, the refrigerant connection address and circuit connection address detected by the second and third pipeline connection assemblies 30 will be inconsistent, both showing as 8. This indicates that indoor unit No. 8 is confused between the second and third pipeline connection assemblies 30. Simply find the communication line or refrigerant line of indoor unit No. 8 in the second and third pipeline connection assemblies 30 and connect it to the other branch.

[0104] The third scenario: Detection failed (the pipeline connection component 30 failed both detection conditions), and the output detection result shows FF.

[0105] If the third pipeline connection assembly 30 fails the initial test, it is marked and the test proceeds to the fourth pipeline connection assembly 30. After the fourth pipeline connection assembly 30 is tested, the pipeline connection assembly 30 that failed the initial test is tested again starting from step 2. Indoor units whose communication lines and piping connections are on the same branch as the pipeline connection assembly 30 that passed the initial test are not tested again. If the third pipeline connection assembly 30 still fails the test during the second test, "FF" is displayed. Otherwise, it is displayed as SS or an inconsistent indoor unit address based on the second test result.

[0106] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included 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. An air conditioning system, characterized in that, include: An outdoor unit for an air conditioner, wherein the outdoor unit is equipped with an outdoor unit liquid pipe and an outdoor unit gas pipe; Multiple indoor air conditioning units, each indoor air conditioning unit being equipped with an indoor unit liquid pipe and an indoor unit gas pipe; A valve box is provided with multiple pipeline connection assemblies, each including an electronic expansion valve; the indoor unit liquid pipe is connected to the outdoor unit liquid pipe, the indoor unit gas pipe is connected to the electronic expansion valve in the pipeline connection assembly, and the electronic expansion valve is connected to the outdoor unit gas pipe; the air conditioner indoor unit is electrically connected to the corresponding electronic expansion valve in the pipeline connection assembly. The controller is electrically connected to the indoor unit of the air conditioner; The controller is configured to record the circuit connection address of the indoor unit of the air conditioner corresponding to the pipeline connection assembly; The controller is configured to record the refrigerant pipeline connection address of the indoor unit of the air conditioner corresponding to the pipeline connection assembly; The controller is configured to output a detection result based on the circuit connection address and the refrigerant pipeline connection address; the detection result is used to display whether the detection is qualified and to display the address of the air conditioner indoor unit with incorrect connection.

2. The air conditioning system according to claim 1, characterized in that, Identify the pipeline connection components currently being inspected; Record the circuit connection address of the indoor unit of the air conditioner corresponding to the currently detected pipeline connection component; Switch to the pipeline connection component to be tested and record the corresponding circuit connection address of the indoor air conditioning unit.

3. The air conditioning system according to claim 1, characterized in that, The electronic expansion valve includes a first expansion valve and a second expansion valve; The outdoor unit air pipe includes an outdoor unit low-pressure air pipe and an outdoor unit high-pressure air pipe; The indoor unit's gas pipe is respectively connected to the first expansion valve and the second expansion valve in the corresponding pipeline connection assembly. The first expansion valve is connected to the low-pressure gas pipe of the outdoor unit, and the second expansion valve is connected to the high-pressure gas pipe of the outdoor unit. The air conditioner's indoor unit is electrically connected to the first expansion valve and the second expansion valve in the corresponding pipeline connection assembly. The controller is configured to identify the pipeline connection assembly currently being detected as one where the first expansion valve is in the open state and the second expansion valve changes from the open state to the closed state during the detection process.

4. The air conditioning system according to claim 3, characterized in that, The controller is configured to send a cooling operation signal to all indoor air conditioning units; After running for the first preset time, a shutdown signal is sent to all indoor air conditioning units. Send a heating operation signal to any indoor air conditioning unit; record the on / off status of each electronic expansion valve in the valve box, and identify the pipeline connection assembly where the first expansion valve is in the open state and the second expansion valve changes from the open state to the closed state as the currently detected pipeline connection assembly.

5. The air conditioning system according to any one of claims 1-4, characterized in that, The controller is configured to record the address of the indoor unit whose status changes from cooling stop to heating stop. This indoor unit address is the circuit connection address of each indoor unit in the currently detected pipeline connection assembly.

6. The air conditioning system according to claim 1, characterized in that, The controller is configured to send a heating stop command to all indoor air conditioning units; Referring to the recorded circuit connection addresses, heating commands are sent sequentially to any indoor air conditioning unit of each pipeline connection component; Record the liquid pipe temperature T of each indoor air conditioner unit before any indoor unit issues a heating operation signal. I,t-1 (n) and the temperature of the air conditioner indoor unit pipe T g,t-1 (n); Record the liquid pipe temperature T of each indoor air conditioner unit after any indoor air conditioner unit executes the heating operation signal. I,t (n) and the temperature of the air conditioner indoor unit pipe T g,t (n); Calculate the gas pipe temperature difference ΔT for each indoor air conditioner unit. g (n) and the change in temperature difference ΔT between the gas and liquid pipes g,t (n); When the temperature difference in the trachea is ΔT g (n) is greater than the first preset difference and the change in temperature difference ΔT between the gas and liquid pipes g,t (n) When the difference is greater than the second preset value, the address of the indoor unit of the air conditioner is recorded as the refrigerant pipe connection address of the indoor unit of the air conditioner corresponding to the currently detected pipe connection component; n represents the address of the indoor unit of the air conditioner.

7. The air conditioning system according to claim 1, characterized in that, The controller is configured to record the average exhaust temperature Tdini of the outdoor unit of the air conditioner, and to record the average exhaust temperature Tdend of the outdoor unit of the air conditioner after a second preset time. The controller is configured to determine whether the detection conditions are qualified based on the formula |Tdend-Tdini|≤ a third preset difference. If the formula is true, the test conditions are deemed to be qualified. Then, the connection relationship of the current pipeline connection components is determined to be correct based on whether the recorded circuit connection address and refrigerant pipeline connection address are consistent. If the formula is not valid, the testing conditions are deemed unqualified, the currently tested pipeline connection component is marked as unqualified for the first time, and the testing of the next pipeline connection component is carried out.

8. The air conditioning system according to claim 7, characterized in that, The controller is configured to display a failure message when the pipeline connection assembly fails to meet the detection conditions twice. The controller is also configured to display whether the connection relationship of the pipeline connection assembly is correct when the second detection condition of the pipeline connection assembly is qualified.

9. The air conditioning system according to claim 7, characterized in that, The controller is configured to, when the detection conditions are met, if the circuit connection address and refrigerant pipe connection address of each corresponding air conditioner indoor unit in the currently detected pipeline connection assembly are consistent, then display a prompt message indicating that the corresponding pipeline connection assembly is correctly connected; if the circuit connection address and refrigerant pipe connection address of each corresponding air conditioner indoor unit in the currently detected pipeline connection assembly are inconsistent, then display the address of the air conditioner indoor unit whose circuit connection address and refrigerant pipe connection address are inconsistent.

10. The air conditioning system according to claim 1, characterized in that, The controller is configured to determine an indoor air conditioner whose circuit connection address or refrigerant pipe connection address appears only once during the connection relationship detection process as a refrigerant pipe cut-off or blockage.

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