Four-way valve blow-by suppression method and device for dynamic differential pressure monitoring and flow regulation

Abstract

The invention relates to a four-way valve blow-by restraining method and device for dynamic pressure difference monitoring and flow adjustment, and when slight blow-by of a four-way valve is judged, the opening degree of an electronic expansion valve is adjusted according to the difference value of the real-time pressure difference and the judged pressure difference. When severe blow-by of the four-way valve is judged, a compressor is shut down and then restarted, the frequency of the compressor is controlled to rise to a first-stage set frequency, the opening degree of an electronic expansion valve is adjusted to the opening degree of a first-stage expansion valve, and after the four-way valve is switched into normal energy adjustment, the real-time pressure difference is updated, and blow-by degree is judged; after updating, blow-by is still judged, the compressor is restarted after being shut down for the second time, the frequency of the compressor is controlled to rise to the second-stage set frequency, the opening degree of an electronic expansion valve is adjusted to the opening degree of a second-stage expansion valve, and after a four-way valve is switched to enter normal energy adjustment, the real-time pressure difference and blow-by degree are judged for the second time; and if the blow-by is still judged after the secondary updating, controlling the four-way valve to stop and reporting a blow-by fault. The blow-by fault is processed in stages, and the situation that the heat pump air conditioner cannot be used due to direct shutdown is avoided.

Description

Technical Field

[0001] This application relates to the field of heat pump control technology, and in particular to a method and apparatus for suppressing cross-flow of a four-way valve with dynamic differential pressure monitoring and flow regulation. Background Art

[0002] Four-way valves are mainly used in heat pump air conditioners. They are called four-way valves because they are connected to four pipes in their structure.

[0003] The function of a four-way valve is to switch between cooling, heating, and defrosting functions by changing the flow of refrigerant in the system. One of the common faults in heat pump air conditioners, namely gas leakage, is caused by the four-way valve. Due to impurities, poor lubrication, or uneven system pressure, the internal slide valve of the four-way valve cannot completely seal, causing refrigerant to leak from the high-pressure side (discharge) to the low-pressure side (suction). Gas leakage through the four-way valve significantly affects the performance of the heat pump air conditioning system.

[0004] The current solution to the problem of gas leakage in the four-way valve is to immediately shut down the system when the gas leakage fault is triggered, which renders the heat pump air conditioning system unusable. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a method and apparatus for suppressing cross-flow of a four-way valve with dynamic differential pressure monitoring and flow regulation, in order to solve the problem that the heat pump air conditioning system cannot be used because it immediately shuts down after a cross-flow fault is triggered in the prior art.

[0006] This application provides a method for suppressing cross-flow in a four-way valve with dynamic differential pressure monitoring and flow regulation, including the following steps:

[0007] The system acquires real-time differential pressure, ambient temperature, and outlet water temperature at the monitoring time, and uses the differential pressure judgment table to determine the judgment differential pressure based on the ambient temperature and outlet water temperature; wherein, the real-time differential pressure is the air pressure difference between the high-pressure exhaust port and the low-pressure intake port of the four-way valve.

[0008] The real-time differential pressure is compared with the judgment differential pressure to determine the degree of leakage of the four-way valve; the degree of leakage includes mild leakage and severe leakage.

[0009] When a slight leak is detected in the four-way valve, the opening of the electronic expansion valve is adjusted based on the difference between the real-time differential pressure and the detected differential pressure.

[0010] When a severe cross-flow is detected in the four-way valve, the compressor is shut down and then restarted. The compressor frequency is increased to the first-level set frequency, the opening of the electronic expansion valve is adjusted to the first-level expansion valve opening, and the four-way valve is switched to normal adjustable state. The real-time differential pressure and cross-flow degree are then updated.

[0011] If gas leakage is still detected after the update, the compressor is shut down and restarted a second time. The compressor frequency is increased to the secondary set frequency, the electronic expansion valve opening is adjusted to the secondary expansion valve opening, and the four-way valve is switched to normal adjustable state. The real-time pressure difference and gas leakage degree are then updated a second time. Among these, the secondary set frequency is greater than the primary set frequency, and the secondary expansion valve opening is less than the primary expansion valve opening.

[0012] If the system still detects gas leakage after a second update, it will control the four-way valve to stop and report a gas leakage fault.

[0013] The dynamic differential pressure monitoring and flow regulation method for suppressing cross-flow in a four-way valve in this application acquires the real-time differential pressure, ambient temperature, and outlet water temperature at the monitoring time, and determines the judgment differential pressure by querying a differential pressure judgment table based on the ambient temperature and outlet water temperature. The real-time differential pressure is compared with the judgment differential pressure to determine the degree of cross-flow in the four-way valve. If a slight cross-flow is determined, the opening of the electronic expansion valve is adjusted according to the difference between the real-time differential pressure and the judgment differential pressure. If a severe cross-flow is determined, the compressor is shut down and restarted, the compressor frequency is increased to the first-level set frequency, the electronic expansion valve opening is adjusted to the first-level expansion valve opening, and the four-way valve is switched to normal operating condition before updating the real-time differential pressure and the degree of cross-flow judgment. If cross-flow is still determined after the update, the compressor is shut down and restarted a second time, the compressor frequency is increased to the second-level set frequency, the electronic expansion valve opening is adjusted to the second-level expansion valve opening, and the four-way valve is switched to normal operating condition before updating the real-time differential pressure and the degree of cross-flow judgment a second time. If cross-flow is still determined after the second update, the four-way valve is stopped and a cross-flow fault is reported. Therefore, when a cross-flow fault occurs in the four-way valve, the fault is classified and handled step by step according to its severity, so as to avoid directly shutting down the heat pump air conditioner and making it unusable.

[0014] As one optional embodiment, the differential pressure determination table includes:

[0015] Several temperature-gradient outlet water temperature ranges and several temperature-gradient ambient temperature ranges; each outlet water temperature range corresponds to a reference pressure difference value, which decreases in an arithmetic progression with the temperature of the ambient temperature range, forming the pressure difference judgment value corresponding to the ambient temperature range; wherein, the reference pressure difference value increases with the temperature of the outlet water temperature range.

[0016] As one optional embodiment, the process of comparing the real-time differential pressure with the determination differential pressure to determine the degree of leakage of the four-way valve includes the following steps:

[0017] The first determination difference is determined based on the difference between the determination pressure difference and the first correction value, and the second determination difference is determined based on the difference between the determination pressure difference and the second correction value.

[0018] Among them, the first correction value is less than the second correction value;

[0019] When the real-time differential pressure is greater than the second judgment difference but not greater than the first judgment difference, the four-way valve is judged to have slight leakage.

[0020] If the real-time differential pressure is not greater than the second judgment difference, the four-way valve is judged to be severely leaking.

[0021] As one optional embodiment, when a slight leak is detected in the four-way valve, the process of adjusting the opening of the electronic expansion valve based on the difference between the real-time differential pressure and the determined differential pressure includes the following steps:

[0022] Adjust the electronic expansion valve opening to the target expansion valve opening;

[0023] The target expansion valve opening is given by the following formula:

[0024] Target expansion valve opening = Current expansion valve opening + Current expansion valve opening * (ΔP_DS actual - ΔP_DS normal) * P factor; where ΔP_DS actual represents the real-time differential pressure, ΔP_DS normal represents the judgment differential pressure, and P_factor represents the proportional factor for opening compensation.

[0025] As one optional embodiment, the primary set frequency is the initial switching frequency of the four-way valve multiplied by the primary frequency multiple;

[0026] The secondary set frequency is the initial switching frequency of the four-way valve multiplied by the secondary frequency multiple;

[0027] Among them, the frequency multiple of the second stage is greater than that of the first stage.

[0028] As one optional embodiment, the opening degree of the first-stage expansion valve is the initial expansion valve opening degree of the four-way valve multiplied by the first-stage opening degree multiple;

[0029] The opening degree of the secondary expansion valve is the initial expansion valve opening degree of the four-way valve multiplied by the secondary opening degree multiple;

[0030] Among them, the opening ratio of the second level is less than that of the first level.

[0031] As one optional embodiment, when a severe cross-flow is determined in the four-way valve, the compressor is shut down and then restarted. The compressor frequency is increased to the first-level set frequency, the electronic expansion valve opening is adjusted to the first-level expansion valve opening, and the four-way valve is switched to normal adjustable state. The process of updating the real-time differential pressure and the degree of cross-flow includes the following steps:

[0032] When a severe cross-flow is detected in the four-way valve, the compressor is shut down for the first time and then restarted. The compressor frequency is increased to the first-level set frequency, the opening of the electronic expansion valve is adjusted to the first-level expansion valve opening, and the four-way valve is switched to enter the second time of normal adjustable operation. The real-time differential pressure and cross-flow degree are then updated.

[0033] If cross-flow is still detected after the update, the compressor is shut down and restarted a second time. The compressor frequency is increased to the secondary set frequency, the electronic expansion valve opening is adjusted to the secondary expansion valve opening, and the four-way valve is switched to normal adjustable position. The process of updating the real-time differential pressure and cross-flow determination again includes the following steps:

[0034] If gas leakage is still detected after the update, the compressor is shut down for the second time and then restarted after the first period. The compressor frequency is increased to the second-level set frequency, the opening of the electronic expansion valve is adjusted to the second-level expansion valve opening, and the four-way valve is switched to enter the normal adjustable second period. The real-time pressure difference and gas leakage degree are then updated for the second time.

[0035] This application also provides a four-way valve cross-flow suppression device for dynamic differential pressure monitoring and flow regulation, comprising:

[0036] The differential pressure determination module is used to acquire the real-time differential pressure, ambient temperature, and outlet water temperature at the monitoring time, and to query the differential pressure determination table based on the ambient temperature and outlet water temperature to determine the determination differential pressure; wherein, the real-time differential pressure is the air pressure difference between the high-pressure exhaust port and the low-pressure intake port of the four-way valve.

[0037] The differential pressure comparison module is used to compare the real-time differential pressure with the judgment differential pressure to determine the degree of leakage of the four-way valve; the degree of leakage includes mild leakage and severe leakage.

[0038] The primary adjustment module is used to adjust the opening of the electronic expansion valve based on the difference between the real-time differential pressure and the determined differential pressure when a slight leak is detected in the four-way valve.

[0039] The secondary adjustment module is used to shut down and restart the compressor when the four-way valve is found to have severe leakage, control the compressor frequency to increase to the first-level set frequency, adjust the opening of the electronic expansion valve to the first-level expansion valve opening, switch the four-way valve to normal adjustable state, and update the real-time differential pressure and leakage degree judgment.

[0040] The three-stage adjustment module is used to detect gas leakage after the update, shut down the compressor a second time and restart it, control the compressor frequency to increase to the secondary set frequency, adjust the electronic expansion valve opening to the secondary expansion valve opening, switch the four-way valve to normal adjustable state and update the real-time pressure difference and gas leakage degree judgment a second time; wherein, the secondary set frequency is greater than the primary set frequency, and the secondary expansion valve opening is less than the primary expansion valve opening.

[0041] The fault alarm module is used to control the four-way valve to stop and report a gas leakage fault if the gas leakage is still detected after a second update.

[0042] The four-way valve cross-flow suppression device for dynamic differential pressure monitoring and flow regulation in this application acquires the real-time differential pressure, ambient temperature, and outlet water temperature at the monitoring time, and determines the judgment differential pressure by consulting a differential pressure judgment table based on the ambient temperature and outlet water temperature. The real-time differential pressure is compared with the judgment differential pressure to determine the degree of cross-flow in the four-way valve. If a slight cross-flow is determined, the opening of the electronic expansion valve is adjusted according to the difference between the real-time differential pressure and the judgment differential pressure. If a severe cross-flow is determined, the compressor is shut down and restarted, the compressor frequency is increased to the first-level set frequency, the electronic expansion valve opening is adjusted to the first-level expansion valve opening, and the four-way valve is switched to normal operating condition before updating the real-time differential pressure and cross-flow degree judgment. If cross-flow is still determined after the update, the compressor is shut down and restarted a second time, the compressor frequency is increased to the second-level set frequency, the electronic expansion valve opening is adjusted to the second-level expansion valve opening, and the four-way valve is switched to normal operating condition before updating the real-time differential pressure and cross-flow degree judgment a second time. If cross-flow is still determined after the second update, the four-way valve is stopped and a cross-flow fault is reported. Therefore, when a cross-flow fault occurs in the four-way valve, the fault is classified and handled step by step according to its severity, so as to avoid directly shutting down the heat pump air conditioner and making it unusable.

[0043] At least one embodiment of this application also provides a data control device, including:

[0044] One or more memories that store computer-executable instructions non-transitory;

[0045] One or more processors are configured to run computer-executable instructions, wherein the computer-executable instructions are executed by the one or more processors to implement the four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation according to any embodiment of the present application.

[0046] The aforementioned data control device acquires real-time differential pressure, ambient temperature, and outlet water temperature at the monitoring time, and determines the judgment differential pressure by consulting the differential pressure judgment table based on the ambient temperature and outlet water temperature. The real-time differential pressure is compared with the judgment differential pressure to determine the degree of air leakage in the four-way valve. If a slight air leakage is determined in the four-way valve, the opening of the electronic expansion valve is adjusted according to the difference between the real-time differential pressure and the judgment differential pressure. If a severe air leakage is determined in the four-way valve, the compressor is shut down and restarted, the compressor frequency is increased to the first-level set frequency, the electronic expansion valve opening is adjusted to the first-level expansion valve opening, and the four-way valve is switched to normal operating condition before updating the real-time differential pressure and the judgment of the degree of air leakage. If air leakage is still determined after the update, the compressor is shut down and restarted a second time, the compressor frequency is increased to the second-level set frequency, the electronic expansion valve opening is adjusted to the second-level expansion valve opening, and the four-way valve is switched to normal operating condition before updating the real-time differential pressure and the judgment of the degree of air leakage a second time. If air leakage is still determined after the second update, the four-way valve is stopped and an air leakage fault is reported. Therefore, when a cross-flow fault occurs in the four-way valve, the fault is classified and handled step by step according to its severity, so as to avoid directly shutting down the heat pump air conditioner and making it unusable.

[0047] At least one embodiment of this application also provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, implement a four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation according to any embodiment of this application.

[0048] The aforementioned non-transient computer-readable storage medium acquires real-time differential pressure, ambient temperature, and outlet water temperature at the monitoring time, and determines the judgment differential pressure by querying a differential pressure judgment table based on the ambient temperature and outlet water temperature. The real-time differential pressure is compared with the judgment differential pressure to determine the degree of cross-flow in the four-way valve. If a slight cross-flow is determined in the four-way valve, the opening of the electronic expansion valve is adjusted according to the difference between the real-time differential pressure and the judgment differential pressure. If a severe cross-flow is determined in the four-way valve, the compressor is shut down and restarted, the compressor frequency is increased to the first-level set frequency, the electronic expansion valve opening is adjusted to the first-level expansion valve opening, and the four-way valve is switched to normal operating mode before updating the real-time differential pressure and cross-flow degree judgment. If cross-flow is still determined after the update, the compressor is shut down and restarted a second time, the compressor frequency is increased to the second-level set frequency, the electronic expansion valve opening is adjusted to the second-level expansion valve opening, and the four-way valve is switched to normal operating mode before updating the real-time differential pressure and cross-flow degree judgment a second time. If cross-flow is still determined after the second update, the four-way valve is stopped and a cross-flow fault is reported. Therefore, when a cross-flow fault occurs in the four-way valve, the fault is classified and handled step by step according to its severity, so as to avoid directly shutting down the heat pump air conditioner and making it unusable. Attached Figure Description

[0049] Figure 1 A flowchart of a four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation according to an embodiment of the application;

[0050] Figure 2 This is a schematic diagram of the working structure of the four-way valve according to an embodiment of this application;

[0051] Figure 3 A flowchart of a four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation, as a preferred embodiment;

[0052] Figure 4 This is a structural diagram of a four-way valve cross-flow suppression device module for dynamic differential pressure monitoring and flow regulation according to an embodiment of the application.

[0053] Figure 5 A schematic block diagram of a data control device provided by the present invention;

[0054] Figure 6 This is a schematic diagram of a non-transitory computer-readable storage medium provided by the present invention. DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0056] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0057] To keep the following description of the embodiments of this application clear and concise, detailed descriptions of some known functions and components have been omitted.

[0058] This application provides a method for suppressing cross-flow of a four-way valve by dynamically monitoring differential pressure and regulating flow.

[0059] Figure 1 This is a flowchart of a four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation according to an embodiment of the application, as follows: Figure 1 As shown, a four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation according to an embodiment of the application includes steps S100 to S105:

[0060] S100 acquires the real-time differential pressure, ambient temperature, and outlet water temperature at the monitoring time, and determines the differential pressure by querying the differential pressure judgment table based on the ambient temperature and outlet water temperature; wherein, the real-time differential pressure is the air pressure difference between the high-pressure exhaust port and the low-pressure intake port of the four-way valve.

[0061] S101, compare the real-time differential pressure with the judgment differential pressure to determine the degree of leakage of the four-way valve; the degree of leakage includes mild leakage and severe leakage.

[0062] S102, when a slight leakage is detected in the four-way valve, the opening of the electronic expansion valve is adjusted according to the difference between the real-time differential pressure and the detected differential pressure.

[0063] S103, when the four-way valve is determined to be severely leaking, the compressor is shut down and then restarted, the compressor frequency is controlled to rise to the first-level set frequency, the opening of the electronic expansion valve is adjusted to the opening of the first-level expansion valve, the four-way valve is switched to normal adjustable state and the real-time differential pressure and leaking degree determination are updated.

[0064] S104, after the update, still determines gas leakage, shuts down the compressor a second time and restarts it, controls the compressor frequency to the secondary set frequency, adjusts the electronic expansion valve opening to the secondary expansion valve opening, switches the four-way valve to normal adjustable state and then updates the real-time pressure difference and gas leakage degree determination a second time; among which, the secondary set frequency is greater than the primary set frequency, and the secondary expansion valve opening is less than the primary expansion valve opening.

[0065] S105 If the system still detects gas leakage after the second update, it will control the four-way valve to stop and report a gas leakage fault.

[0066] Figure 2 This is a schematic diagram of the working structure of the four-way valve according to an embodiment of this application, as shown below. Figure 2 As shown, a differential pressure sensor is installed between the high-pressure exhaust port (D) and the low-pressure intake port (S) of the four-way valve to capture the real-time differential pressure at the monitoring moment, i.e., the pressure difference between the high-pressure exhaust port (D) and the low-pressure intake port (S). Simultaneously, a temperature sensor is installed in the operating environment of the four-way valve to capture the ambient temperature at the monitoring moment based on the same trigger time. A temperature sensor is also installed at the outlet of the plate heat exchanger to capture the outlet water temperature at the monitoring moment based on the same trigger time.

[0067] Based on the ambient temperature and outlet water temperature at the monitoring time, the differential pressure is queried using the differential pressure judgment table.

[0068] In this embodiment, the differential pressure determination table includes:

[0069] Several temperature-gradient outlet water temperature ranges and several temperature-gradient ambient temperature ranges; each outlet water temperature range corresponds to a reference pressure difference value, which decreases in an arithmetic progression with the temperature of the ambient temperature range, forming the pressure difference judgment value corresponding to the ambient temperature range; wherein, the reference pressure difference value increases with the temperature of the outlet water temperature range.

[0070] Preferably, based on the stable operation of the four-way valve system (non-switching process) and the absence of cross-flow, after testing and recording the operating conditions, this embodiment proposes the following differential pressure judgment table to effectively identify cross-flow conditions and assist in subsequent identification of mild and severe cross-flow, as shown in Table 1 below (unit: bar):

[0071] Table 1 Pressure Difference Judgment Table of Preferred Embodiments

[0072]

[0073] The degree of leakage of the four-way valve is determined by comparing the real-time differential pressure with the judgment differential pressure.

[0074] Preferably, Figure 3 A flowchart of a preferred embodiment of a four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation is shown below. Figure 3 As shown, the process of comparing the real-time pressure difference with the judgment pressure difference in step S101 to determine the degree of leakage of the four-way valve includes steps S200 to S202:

[0075] S200, a first determination difference is determined based on the difference between the determination pressure difference and the first correction value, and a second determination difference is determined based on the difference between the determination pressure difference and the second correction value; wherein, the first correction value is less than the second correction value;

[0076] S201, when the real-time differential pressure is greater than the second judgment difference but not greater than the first judgment difference, the four-way valve is judged to have slight leakage.

[0077] S202, when the real-time pressure difference is not greater than the second judgment difference, the four-way valve is judged to be severely leaking.

[0078] The first correction value is 0.5-1.5 bar, and the second correction value is 1.5-2.5 bar.

[0079] Preferably, the first correction value is 1 and the second correction value is 2, that is, the gas leakage determination is as follows:

[0080] If ΔP_DS_actual ≤ ΔP_DS_normal - 1, it is determined to be a mild cross-contamination.

[0081] If ΔP_DS_actual ≤ ΔP_DS_normal - 2, it is determined to be severe cross-contamination.

[0082] Where ΔP_DS_actual represents the real-time differential pressure, and ΔP_DS_normal represents the judgment differential pressure.

[0083] When a mild gas leak is detected, unlike traditional control methods, this application does not perform a shutdown operation. Instead, it adjusts the opening of the electronic expansion valve of the four-way valve based on the real-time pressure difference and the determined pressure difference to eliminate the gas leak fault. Based on this, this application proposes a specific control method for mild and severe gas leaks.

[0084] Preferably, when a slight leak is detected in the four-way valve, the process of adjusting the opening of the electronic expansion valve based on the difference between the real-time differential pressure and the determined differential pressure includes the following steps:

[0085] Adjust the electronic expansion valve opening to the target expansion valve opening;

[0086] The target expansion valve opening is given by the following formula:

[0087] Target expansion valve opening = Current expansion valve opening + Current expansion valve opening * (ΔP_DS actual - ΔP_DS normal) * P factor; where ΔP_DS actual represents the real-time differential pressure, ΔP_DS normal represents the judgment differential pressure, and P_factor represents the proportional factor for opening compensation.

[0088] The scaling factor is 0.1-0.3. Preferably, based on actual operating conditions, the scaling factor is 0.2. It should be noted that the selection of the scaling factor is related to the model of the four-way valve and the working environment. The above are only preferred embodiments of the scaling factor and do not represent the only limitation on the scaling factor.

[0089] When a severe gas leakage is determined in the four-way valve, the compressor frequency and the opening of the electronic expansion valve are adjusted to handle the fault. If a severe gas leakage is still determined after a second update, the four-way valve is shut down and a gas leakage fault is reported. If a mild gas leakage is determined after a second update, the mild gas leakage is handled in accordance with the procedure in step S102.

[0090] Preferably, the primary set frequency is the initial switching frequency of the four-way valve multiplied by the primary frequency multiple;

[0091] The secondary set frequency is the initial switching frequency of the four-way valve multiplied by the secondary frequency multiple;

[0092] Among them, the frequency multiple of the second stage is greater than that of the first stage.

[0093] The primary frequency multiple is 1-1.2; the secondary frequency multiple is 1.1-1.3. Preferably, the primary frequency multiple is 1.1 and the secondary frequency multiple is 1.2. It should be noted that the primary and secondary frequency multiples can be adjusted according to the model of the four-way valve and the working environment. The above are only preferred embodiments and do not represent the only limitation on the primary and secondary frequency multiples.

[0094] Preferably, the opening degree of the first-stage expansion valve is the initial expansion valve opening degree of the four-way valve multiplied by the first-stage opening degree multiple;

[0095] The opening degree of the secondary expansion valve is the initial expansion valve opening degree of the four-way valve multiplied by the secondary opening degree multiple;

[0096] Among them, the opening ratio of the second level is less than that of the first level.

[0097] The primary opening ratio is 0.8-1; the secondary opening ratio is 0.7-0.9. Preferably, the primary opening ratio is 0.9 and the secondary opening ratio is 0.8. It should be noted that the primary and secondary opening ratios can be adjusted according to the model of the four-way valve and the working environment. The above are only preferred embodiments and do not represent the only limitation on the primary and secondary opening ratios.

[0098] Meanwhile, in this embodiment, the time for compressor shutdown and normal operation is set to ensure the effectiveness of handling severe cross-contamination.

[0099] Preferably, such as Figure 3 As shown, in step S103, when a severe cross-flow is detected in the four-way valve, the compressor is shut down and then restarted. The compressor frequency is increased to the first-level set frequency, the opening of the electronic expansion valve is adjusted to the first-level expansion valve opening, and the four-way valve is switched to normal adjustable state. The process of updating the real-time differential pressure and the degree of cross-flow is then described, including step S300:

[0100] When the S300 determines that the four-way valve is severely leaking, it shuts down the compressor for the first time period and then restarts it. It controls the compressor frequency to increase to the first-level set frequency, adjusts the opening of the electronic expansion valve to the first-level expansion valve opening, switches the four-way valve to enter the second time period of normal adjustable function, and then updates the real-time differential pressure and the degree of leaking.

[0101] Step S104 involves a process where, after the update, if gas leakage is still detected, the compressor is shut down and restarted a second time. The compressor frequency is increased to the secondary set frequency, the electronic expansion valve opening is adjusted to the secondary expansion valve opening, and the four-way valve is switched to normal adjustable position. This process then involves a second update of the real-time pressure difference and the determination of the degree of gas leakage. This includes step S301:

[0102] S301, after the update, still judged to be leaking gas. After the first period of the second shutdown of the compressor, it was restarted. The compressor frequency was increased to the second set frequency. The opening of the electronic expansion valve was adjusted to the opening of the second expansion valve. After switching the four-way valve to enter the second period of normal adjustable function, the real-time pressure difference and the judgment of the degree of leaking gas were updated again.

[0103] Among them, the normal controllability means that the opening of the electronic expansion valve is controlled according to the intake superheat degree = intake temperature - coil temperature.

[0104] The first time interval is 2-4 minutes, and the second time interval is 4-6 minutes. Preferably, the first time interval is 3 minutes and the second time interval is 5 minutes. It should be noted that the first and second time intervals can be adjusted according to the model of the four-way valve and the working environment. The above are only preferred embodiments and do not represent the only limitation on the first and second time intervals.

[0105] The dynamic differential pressure monitoring and flow regulation method for suppressing cross-flow in a four-way valve in this application acquires the real-time differential pressure, ambient temperature, and outlet water temperature at the monitoring time, and determines the judgment differential pressure by querying a differential pressure judgment table based on the ambient temperature and outlet water temperature. The real-time differential pressure is compared with the judgment differential pressure to determine the degree of cross-flow in the four-way valve. If a slight cross-flow is determined, the opening of the electronic expansion valve is adjusted according to the difference between the real-time differential pressure and the judgment differential pressure. If a severe cross-flow is determined, the compressor is shut down and restarted, the compressor frequency is increased to the first-level set frequency, the electronic expansion valve opening is adjusted to the first-level expansion valve opening, and the four-way valve is switched to normal operating condition before updating the real-time differential pressure and the degree of cross-flow judgment. If cross-flow is still determined after the update, the compressor is shut down and restarted a second time, the compressor frequency is increased to the second-level set frequency, the electronic expansion valve opening is adjusted to the second-level expansion valve opening, and the four-way valve is switched to normal operating condition before updating the real-time differential pressure and the degree of cross-flow judgment a second time. If cross-flow is still determined after the second update, the four-way valve is stopped and a cross-flow fault is reported. Therefore, when a cross-flow fault occurs in the four-way valve, the fault is classified and handled step by step according to its severity, so as to avoid directly shutting down the heat pump air conditioner and making it unusable.

[0106] This application also provides a four-way valve cross-flow suppression device for dynamic differential pressure monitoring and flow regulation.

[0107] Figure 4 This is a structural diagram of a four-way valve cross-flow suppression device module for dynamic differential pressure monitoring and flow regulation according to an embodiment of the application. Figure 4 As shown, one embodiment of the four-way valve cross-flow suppression device for dynamic differential pressure monitoring and flow regulation includes:

[0108] The differential pressure determination module 100 is used to acquire the real-time differential pressure, ambient temperature and outlet water temperature at the monitoring time, and to query the differential pressure determination table based on the ambient temperature and outlet water temperature to determine the determination differential pressure; wherein, the real-time differential pressure is the air pressure difference between the high-pressure exhaust port and the low-pressure intake port of the four-way valve.

[0109] The differential pressure comparison module 101 is used to compare the real-time differential pressure with the judgment differential pressure to determine the degree of leakage of the four-way valve; wherein, the degree of leakage includes mild leakage and severe leakage.

[0110] The primary adjustment module 102 is used to adjust the opening of the electronic expansion valve based on the difference between the real-time differential pressure and the determined differential pressure when a slight leakage is detected in the four-way valve.

[0111] The secondary adjustment module 103 is used to shut down and restart the compressor when the four-way valve is determined to have severe cross-flow, control the compressor frequency to increase to the first-level set frequency, adjust the opening of the electronic expansion valve to the first-level expansion valve opening, switch the four-way valve to normal adjustable state, and update the real-time pressure difference and cross-flow degree determination.

[0112] The three-stage adjustment module 104 is used to determine gas leakage after the update, shut down the compressor a second time and restart it, control the compressor frequency to the secondary set frequency, adjust the electronic expansion valve opening to the secondary expansion valve opening, switch the four-way valve to normal adjustable state and update the real-time pressure difference and gas leakage degree determination a second time; wherein, the secondary set frequency is greater than the primary set frequency, and the secondary expansion valve opening is less than the primary expansion valve opening.

[0113] The fault alarm module 105 is used to control the four-way valve to stop and report a gas leakage fault if the gas leakage is still detected after the second update.

[0114] The four-way valve cross-flow suppression device for dynamic differential pressure monitoring and flow regulation in this application acquires the real-time differential pressure, ambient temperature, and outlet water temperature at the monitoring time, and determines the judgment differential pressure by consulting a differential pressure judgment table based on the ambient temperature and outlet water temperature. The real-time differential pressure is compared with the judgment differential pressure to determine the degree of cross-flow in the four-way valve. If a slight cross-flow is determined, the opening of the electronic expansion valve is adjusted according to the difference between the real-time differential pressure and the judgment differential pressure. If a severe cross-flow is determined, the compressor is shut down and restarted, the compressor frequency is increased to the first-level set frequency, the electronic expansion valve opening is adjusted to the first-level expansion valve opening, and the four-way valve is switched to normal operating condition before updating the real-time differential pressure and cross-flow degree judgment. If cross-flow is still determined after the update, the compressor is shut down and restarted a second time, the compressor frequency is increased to the second-level set frequency, the electronic expansion valve opening is adjusted to the second-level expansion valve opening, and the four-way valve is switched to normal operating condition before updating the real-time differential pressure and cross-flow degree judgment a second time. If cross-flow is still determined after the second update, the four-way valve is stopped and a cross-flow fault is reported. Therefore, when a cross-flow fault occurs in the four-way valve, the fault is classified and handled step by step according to its severity, so as to avoid directly shutting down the heat pump air conditioner and making it unusable.

[0115] At least one embodiment of this application also provides a data control device. Figure 5 This is a schematic block diagram of a data control device provided for at least one embodiment of this application. For example, such as... Figure 5 As shown, the data control device 20 may include one or more memories 200 and one or more processors 201. The memories 200 are used to store computer-executable instructions non-transiently; the processors 201 are used to run the computer-executable instructions, which, when run by the processors 201, can cause the processors 201 to perform one or more steps in the four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation according to any embodiment of this application.

[0116] For the specific implementation and explanation of each step of the four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation, please refer to the relevant content in the embodiments of the above-mentioned four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation, which will not be repeated here. It should be noted that Figure 5 The components of the data control device 20 shown are merely exemplary and not limiting. The data control device 20 may have other components depending on the actual application requirements.

[0117] In one embodiment, the processor 201 and the memory 200 can communicate directly or indirectly with each other. For example, the processor 201 and the memory 200 can communicate via a network connection. The network can include a wireless network, a wired network, and / or any combination of wireless and wired networks; this application does not limit the type and function of the network. Alternatively, the processor 201 and the memory 200 can also communicate via a bus connection. The bus can be a Peripheral Component Interconnect Standard (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. For example, the processor 201 and the memory 200 can be located at a remote data server (cloud) or a distributed energy system (local), or at a client (e.g., a mobile device such as a mobile phone). For example, the processor 201 can be a central processing unit (CPU), a tensor processor (TPU), or a graphics processing unit (GPU), etc., with data processing and / or instruction execution capabilities, and can control other components in the data prediction device 20 to perform desired functions. The central processing unit (CPU) can be an x86 or ARM architecture, etc.

[0118] In one embodiment, memory 200 may include any combination of one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, erasable programmable read-only memory (EPROM), portable compact disc read-only memory (CD-ROM), USB memory, flash memory, etc. One or more computer-executable instructions may be stored on the computer-readable storage medium, and processor 201 may execute these computer-executable instructions to implement various functions of the data prediction device 20. Various applications and various data, as well as various data used and / or generated by the applications, may also be stored in memory 200.

[0119] It should be noted that the data control device 20 can achieve similar technical effects to the aforementioned four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation, and the repetitive parts will not be described again.

[0120] At least one embodiment of this application also provides a non-transitory computer-readable storage medium. Figure 6This is a schematic diagram of a non-transitory computer-readable storage medium provided for at least one embodiment of this application. For example, such as... Figure 6 As shown, one or more computer-executable instructions 301 may be stored non-transitory on the non-transitory computer-readable storage medium 30. For example, when the computer-executable instructions 301 are executed by a computer, the computer may perform one or more steps in the four-way valve crossflow suppression method for dynamic differential pressure monitoring and flow regulation according to any embodiment of the present application.

[0121] In one embodiment, the non-transitory computer-readable storage medium 30 can be applied to the data control device 20 described above, for example, it can be the memory 200 in the data control device 20.

[0122] In one embodiment, the description of the non-transitory computer-readable storage medium 30 can be found in the description of the memory 200 in the embodiment of the data control device 20, and will not be repeated hereafter.

[0123] It should be noted that the memory 200 stores different non-transient computer-executable instructions, and the data control device 20 corresponds to the firmware upgrade device. When the computer-executable instructions are run by the processor 201, the processor 201 can perform one or more steps in the four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation according to any embodiment of this application.

[0124] The following points should be noted regarding this application:

[0125] (1) The accompanying drawings of the embodiments of this application only involve the structures involved in the embodiments of this application. Other structures can be referred to the general design.

[0126] (2) For clarity, the thickness and dimensions of layers or structures are enlarged in the accompanying drawings used to describe embodiments of the invention. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element, or there may be intermediate elements present.

[0127] (3) Where there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other to obtain new embodiments. The above are only specific implementations of this application, but the protection scope of this application is not limited thereto, and the protection scope of this application shall be determined by the protection scope of the claims.

[0128] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for suppressing cross-flow in a four-way valve with dynamic differential pressure monitoring and flow regulation, characterized in that, Including the following steps: The system acquires the real-time differential pressure, ambient temperature, and outlet water temperature at the monitoring time, and uses the ambient temperature and outlet water temperature to query the differential pressure judgment table to determine the judgment differential pressure (supplementary unit of differential pressure); wherein, the real-time differential pressure is the air pressure difference between the high-pressure exhaust port and the low-pressure intake port of the four-way valve; The real-time differential pressure is compared with the judgment differential pressure to determine the degree of leakage of the four-way valve; wherein, the degree of leakage includes mild leakage and severe leakage. When a slight leak is detected in the four-way valve, the opening of the electronic expansion valve is adjusted according to the difference between the real-time pressure difference and the detected pressure difference. When a severe gas leakage is detected in the four-way valve, the compressor is shut down and then restarted. The compressor frequency is increased to the first-level set frequency, the opening of the electronic expansion valve is adjusted to the first-level expansion valve opening, and the four-way valve is switched to normal adjustable state before updating the real-time pressure difference and the gas leakage degree determination. If gas leakage is still detected after the update, the compressor is shut down and restarted a second time. The compressor frequency is increased to the secondary set frequency, the electronic expansion valve opening is adjusted to the secondary expansion valve opening, and the four-way valve is switched to normal adjustable state before the real-time pressure difference and gas leakage degree determination are updated a second time. The secondary set frequency is greater than the primary set frequency, and the secondary expansion valve opening is less than the primary expansion valve opening. If the system still detects gas leakage after a second update, it will control the four-way valve to stop and report a gas leakage fault.

2. The method for suppressing cross-flow of a four-way valve with dynamic differential pressure monitoring and flow regulation according to claim 1, characterized in that, The differential pressure determination table includes: Several temperature-gradient outlet water temperature ranges and several temperature-gradient ambient temperature ranges; each outlet water temperature range corresponds to a reference pressure difference value, which decreases in an arithmetic progression with the temperature of the ambient temperature range, forming the pressure difference judgment value corresponding to the ambient temperature range; wherein, the reference pressure difference value increases with the temperature of the outlet water temperature range.

3. The method for suppressing cross-flow of a four-way valve with dynamic differential pressure monitoring and flow regulation according to claim 1, characterized in that, The process of comparing the real-time pressure difference with the determination pressure difference to determine the degree of leakage in the four-way valve includes the following steps: A first determination difference is determined based on the difference between the determined pressure difference and a first correction value, and a second determination difference is determined based on the difference between the determined pressure difference and a second correction value; wherein, the first correction value is less than the second correction value; When the real-time differential pressure is greater than the second judgment difference but not greater than the first judgment difference, the four-way valve is determined to have slight leakage. When the real-time pressure difference is not greater than the second judgment difference, the four-way valve is determined to be severely leaking.

4. The method for suppressing cross-flow of a four-way valve with dynamic differential pressure monitoring and flow regulation according to claim 1, characterized in that, The process of adjusting the opening of the electronic expansion valve based on the difference between the real-time pressure difference and the determined pressure difference when a slight leak is detected in the four-way valve includes the following steps: Adjust the electronic expansion valve opening to the target expansion valve opening; The target expansion valve opening is given by the following formula: Target expansion valve opening = Current expansion valve opening + Current expansion valve opening * (ΔP_DS actual - ΔP_DS normal) * P factor; where ΔP_DS actual represents the real-time differential pressure, ΔP_DS normal represents the determined differential pressure, and P_factor represents the opening compensation proportional factor.

5. The method for suppressing cross-flow of a four-way valve with dynamic differential pressure monitoring and flow regulation according to claim 1, characterized in that, The primary set frequency is the initial switching frequency of the four-way valve multiplied by the primary frequency multiple; The secondary set frequency is the initial switching frequency of the four-way valve multiplied by the secondary frequency multiple; The secondary frequency multiple is greater than the primary frequency multiple.

6. The method for suppressing cross-flow of a four-way valve with dynamic differential pressure monitoring and flow regulation according to claim 1, characterized in that, The opening degree of the first-stage expansion valve is the initial expansion valve opening degree of the four-way valve multiplied by the first-stage opening degree multiple; The opening degree of the secondary expansion valve is the initial expansion valve opening degree of the four-way valve multiplied by the secondary opening degree multiple; Wherein, the secondary opening multiple is less than the primary opening multiple.

7. The method for suppressing cross-flow of a four-way valve in dynamic differential pressure monitoring and flow regulation according to claim 1, characterized in that, The process of shutting down and restarting the compressor, controlling the compressor frequency to the first-level set frequency, adjusting the electronic expansion valve opening to the first-level expansion valve opening, switching the four-way valve to normal adjustable state, and updating the real-time pressure difference and the degree of leakage determination when a severe cross-flow is detected in the four-way valve includes the following steps: When a severe cross-flow is detected in the four-way valve, the compressor is shut down for the first time period and then restarted. The compressor frequency is controlled to increase to the first-level set frequency, the opening of the electronic expansion valve is adjusted to the first-level expansion valve opening, and the four-way valve is switched to enter the second time period of normal adjustable capacity before updating the real-time pressure difference and cross-flow degree. The process of determining the real-time pressure difference and the degree of gas leakage after an update, involving a second shutdown and restart of the compressor, controlling the compressor frequency to the secondary set frequency, adjusting the electronic expansion valve opening to the secondary expansion valve opening, switching the four-way valve to normal adjustable position, and then updating the determination of the real-time pressure difference and the degree of gas leakage, includes the following steps: If gas leakage is still detected after the update, the compressor is shut down for the second time and then restarted after the first period. The compressor frequency is increased to the second-level set frequency, the opening of the electronic expansion valve is adjusted to the opening of the second-level expansion valve, and the four-way valve is switched to enter the normal adjustable second period. The real-time pressure difference and gas leakage degree determination are updated for the second time.

8. A four-way valve cross-flow suppression device for dynamic differential pressure monitoring and flow regulation, characterized in that, include: The differential pressure determination module is used to acquire the real-time differential pressure, ambient temperature, and outlet water temperature at the monitoring time, and to query the differential pressure determination table based on the ambient temperature and the outlet water temperature to determine the determination differential pressure; wherein, the real-time differential pressure is the air pressure difference between the high-pressure exhaust port and the low-pressure intake port of the four-way valve; The differential pressure comparison module is used to compare the real-time differential pressure with the judgment differential pressure to determine the degree of leakage of the four-way valve; wherein, the degree of leakage includes mild leakage and severe leakage. A primary adjustment module is used to adjust the opening of the electronic expansion valve based on the difference between the real-time pressure difference and the determined pressure difference when a slight leak is detected in the four-way valve. The secondary adjustment module is used to shut down and restart the compressor when the four-way valve is found to have severe cross-flow, control the compressor frequency to increase to the first-level set frequency, adjust the opening of the electronic expansion valve to the first-level expansion valve opening, switch the four-way valve to normal adjustable state, and update the real-time pressure difference and cross-flow degree determination. The three-stage adjustment module is used to detect gas leakage after the update, shut down the compressor a second time and restart it, control the compressor frequency to increase to the secondary set frequency, adjust the electronic expansion valve opening to the secondary expansion valve opening, switch the four-way valve to normal adjustable state and update the real-time pressure difference and gas leakage degree determination a second time; wherein, the secondary set frequency is greater than the primary set frequency, and the secondary expansion valve opening is less than the primary expansion valve opening; The fault alarm module is used to control the four-way valve to stop and report a gas leakage fault if the gas leakage is still detected after a second update.

9. A non-transitory computer-readable storage medium, characterized in that, The non-transient computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, implement the four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation as described in any one of claims 1 to 7.

10. A data control device, characterized in that, include: One or more memories that store computer-executable instructions non-transitory; One or more processors configured to run computer-executable instructions, wherein the computer-executable instructions, when run by the one or more processors, implement the four-way valve cross-flow suppression method for dynamic differential pressure monitoring and flow regulation as described in any one of claims 1 to 7.

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