Air conditioning system

Abstract

The invention discloses an air conditioning system, which comprises an indoor module; an outdoor module; the expansion valve device comprises at least one group of electronic expansion valve units; the electronic expansion valve unit comprises a first electronic expansion valve and a second electronic expansion valve; on the outdoor side, the first electronic expansion valve is connected with the outdoor high-low pressure air pipe; the second electronic expansion valve is connected with the outdoor low-pressure air pipe; and the control module is in communication connection with all the electronic expansion valve units, and the control module is used for determining the corresponding relation between the flow and valve opening pulses according to the flow curves of the different electronic expansion valves and achieving control universalization of the different electronic expansion valves through character setting on the basis of the corresponding relation. According to the electronic expansion valve device, the same substrate software can be adopted in the same project through the general instruction generated by the control module, switching between different electronic expansion valve devices is achieved, the continuity of the substrate software is guaranteed, and the complexity of off-site maintenance is simplified.

Description

Technical Field

[0001] This invention relates to the field of refrigeration, and more specifically to an air conditioning system. Background Technology

[0002] The Switch Box unit, when used with a heat recovery unit, enables simultaneous cooling and heating of the indoor units. The electronic expansion valve is a key system component in the Switch Box unit; different electronic expansion valves have different flow characteristics, corresponding to different control modes and functions.

[0003] Different electronic expansion valves are often used in the same project, so the baseboard software needs to be compatible with different control systems, which cannot guarantee its continuity and integrity. In addition, when the opening degree of the electronic expansion valve is switched, especially when the refrigerant flow rate through the valve body changes drastically, such as when the refrigerant flow rate changes from the minimum value to the maximum value, it is easy to generate refrigerant flow sound or noise problems.

[0004] In summary, it is necessary to design an air conditioning system that can achieve universal control of different electronic expansion valves.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0006] In view of the problems pointed out in the background art, the present invention provides an air conditioning system that can achieve universal control between different electronic expansion valve devices, and ensure the continuity and integrity of the baseboard software.

[0007] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0008] In some embodiments of this application, an air conditioning system is provided, including:

[0009] An indoor module, which includes at least one indoor unit;

[0010] The outdoor module includes outdoor high and low pressure gas pipes and outdoor low pressure gas pipes;

[0011] An expansion valve device includes at least one set of electronic expansion valve units; the electronic expansion valve unit includes a first electronic expansion valve and a second electronic expansion valve; the first electronic expansion valve and the second electronic expansion valve are connected in parallel.

[0012] On the outdoor side, the first electronic expansion valve is connected to the outdoor high and low pressure gas pipes; the second electronic expansion valve is connected to the outdoor low pressure gas pipe.

[0013] The control module is communicatively connected to each of the electronic expansion valve units. The control module is used to determine the correspondence between flow rate and valve opening pulse according to the flow curve of different electronic expansion valves, and to realize the universalization of control of different electronic expansion valves by using character settings based on the correspondence.

[0014] In some embodiments of this application,

[0015] The control module is also used to implement pressure equalization control when switching the opening degree of the electronic expansion valve; the pressure equalization control includes a general instruction for setting the pressure equalization pulse.

[0016] In some embodiments of this application,

[0017] The control module is also used to determine the correspondence between each electronic expansion valve at the same opening degree based on the flow curve of the electronic expansion valve; the control module is also used to adjust the electronic expansion valve based on the correspondence and the flow curve.

[0018] In some embodiments of this application,

[0019] The states of the electronic expansion valve include a first opening state, a second opening state, a zero-point reset state, and a compensation opening state; different electronic expansion valves use the same general commands in the same state.

[0020] In some embodiments of this application,

[0021] The electronic expansion unit includes a first filter, a second filter, and a third filter; the first filter is installed on the pipeline connecting the first electronic expansion valve to the outdoor high and low pressure gas pipes; the second filter is installed on the pipeline connecting the second electronic expansion valve to the outdoor low pressure gas pipes; and the third filter is located on the connecting pipeline of the indoor gas pipes.

[0022] In some embodiments of this application,

[0023] The control module is also used to determine the pressure equalization pulse of the electronic expansion valve during the pressure equalization control process by setting the state of the DIP switch.

[0024] In some embodiments of this application,

[0025] The equalizing pulse of the electronic expansion valve satisfies the following formula:

[0026] The equalizing pulse (n) = the number of steps in the compensated opening state + β × n;

[0027] Wherein, β is a constant, and β is related to the type of the electronic expansion valve; n takes the value (0, 1, 2, 3), and n represents the state of the DIP switch.

[0028] In some embodiments of this application,

[0029] The control module is also used to adjust the electronic expansion valve according to the correspondence and flow curve, including:

[0030] Select the corresponding adjustment value based on the state of the DIP switch;

[0031] The initial equalization pulse under the equalization conditions is added to the adjustment value to obtain the equalization pulse.

[0032] In some embodiments of this application,

[0033] Under a certain DIP switch, the equalization pulse of the electronic expansion valve = the number of steps in the compensation opening state - the number of steps in the second opening state.

[0034] In some embodiments of this application, an air conditioning system is provided, including:

[0035] An indoor module, which includes at least one indoor unit;

[0036] The outdoor module includes outdoor high and low pressure gas pipes and outdoor low pressure gas pipes;

[0037] An expansion valve device, comprising multiple sets of electronic expansion valve units;

[0038] A control module, wherein each of the electronic expansion valve units is communicatively connected, the control module includes a normal control mode and a pressure equalization control mode;

[0039] The control module is used to set the general instructions in the normal control mode and the pressure equalization control mode.

[0040] Compared with the prior art, the advantages and positive effects of the present invention are:

[0041] This invention enables the use of the same baseboard software in the same project to switch between different electronic expansion valve devices through the general instructions generated by the control module, thus ensuring the continuity of the baseboard software and simplifying the complexity of off-site maintenance.

[0042] 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

[0043] 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.

[0044] Figure 1 The circulation principle of the single-inlet, single-outlet electronic expansion valve device according to the embodiment. Figure 1 ;

[0045] Figure 2 The circulation principle of the single-inlet, single-outlet electronic expansion valve device according to the embodiment. Figure 2 ;

[0046] Figure 3 The circulation principle of the multi-inlet, multi-outlet electronic expansion valve device according to the embodiment. Figure 1 ;

[0047] Figure 4 The circulation principle of the multi-inlet, multi-outlet electronic expansion valve device according to the embodiment. Figure 2 ;

[0048] Figure 5 The circulation principle of the multi-inlet, multi-outlet electronic expansion valve device according to the embodiment. Figure 3 ;

[0049] Figure 6 This is a schematic diagram of the structure of a single-inlet, single-outlet electronic expansion valve device according to an embodiment;

[0050] Figure 7 This is a schematic diagram of the structure of a four-in-four-out electronic expansion valve device according to an embodiment;

[0051] Figure 8 This is a schematic diagram of the structure of the 12-in-12-out electronic expansion valve device according to an embodiment;

[0052] Figure 9 This is a schematic diagram of the flow rate curve according to an embodiment;

[0053] Figure 10 This is a schematic diagram of the flow rate curve under the second opening state according to an embodiment.

[0054] Figure label:

[0055] 100, Electronic expansion valve unit; 101, First electronic expansion valve unit; 102, Second electronic expansion valve unit; 103, Third electronic expansion valve unit; 110, First electronic expansion valve; 120, Second electronic expansion valve; 130, First filter; 140, Second filter; 150, Third filter; 200, Indoor module; 210, Indoor gas pipe; 220, Indoor liquid pipe; 300, Outdoor module; 310, Outdoor high and low pressure gas pipe; 320, Outdoor low pressure gas pipe; 330, Outdoor liquid pipe. Detailed Implementation

[0056] 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.

[0057] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0058] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0060] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0061] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0062] The air conditioning system in this application includes an outdoor unit and an indoor unit. The air conditioning system 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 the indoor space.

[0063] 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.

[0064] The expansion valve causes the low-temperature, high-pressure liquid refrigerant that condenses in the condenser to expand 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.

[0065] 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.

[0066] 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.

[0067] The electronic expansion valve device involved in this application can be used with a heat recovery unit to achieve simultaneous cooling and heating of the indoor unit. Different electronic expansion valve devices have different flow characteristics, such as different control adjustment steps, corresponding to different control modes. In actual use, when an electronic expansion valve device malfunctions and needs to be replaced, the control module needs to execute the corresponding control mode; or when there are many indoor units, multiple electronic expansion valve devices need to be set up for control, in which case the control module needs to control different electronic expansion valve devices simultaneously. In summary, a universal control module is needed to cope with different electronic expansion valve devices and to achieve continuity of the baseboard software.

[0068] Reference Figures 1-4 As shown, an air conditioning system is provided, including:

[0069] Indoor module 200, which includes at least one indoor unit;

[0070] Outdoor module 300, which includes outdoor high and low pressure air pipes 310 and outdoor low pressure air pipes 320;

[0071] An expansion valve device includes at least one set of electronic expansion valve units 100; the number of electronic expansion valve units 100 corresponds to the number of indoor unit units; each indoor unit includes at least one indoor unit.

[0072] The electronic expansion valve unit 100 includes a first electronic expansion valve 110, a second electronic expansion valve 120, and a filter; the first electronic expansion valve 110 and the second electronic expansion valve 120 are connected in parallel.

[0073] On the outdoor side, the first electronic expansion valve 110 is connected to the outdoor high and low pressure gas pipe 310; the second electronic expansion valve 120 is connected to the outdoor low pressure gas pipe 320.

[0074] The control module is communicatively connected to each of the electronic expansion valve units 100. The control module is used to determine the correspondence between flow rate and valve opening pulse according to the flow curve of different electronic expansion valves, and to realize the universalization of control of different electronic expansion valves by using character settings based on the correspondence.

[0075] The electronic expansion valve device connects the outdoor high and low pressure gas pipes 310 and the outdoor low pressure gas pipe 320 to the indoor gas pipe 210. By controlling the opening of the electronic expansion valve, the direction and flow of refrigerant entering different indoor units are adjusted, enabling simultaneous heating and cooling functions for multiple indoor units. Through corresponding control logic and content, heat recovery and utilization between indoor units are achieved, thereby reducing unit power consumption and achieving energy-saving and low-consumption effects.

[0076] Reference Figure 1 , Figure 2and Figure 6 As shown in the figure, the connection method and refrigerant flow direction of the single-inlet single-outlet electronic expansion device are as follows. The electronic expansion unit includes a first filter 130, a second filter 140, and a third filter 150. The first filter 130 is installed on the pipeline connecting the first electronic expansion valve 110 and the outdoor high and low pressure gas pipe 310. The second filter 140 is installed on the pipeline connecting the second electronic expansion valve 120 and the outdoor low pressure gas pipe 320. The third filter 150 is located on the connecting pipeline of the indoor gas pipe 210.

[0077] Specifically, since the first electronic expansion valve 110 and the second electronic expansion valve 120 are connected in parallel, on the indoor side, the two ends of the parallel connection of the first electronic expansion valve 110 and the second electronic expansion valve 120 are connected to the third filter 150, and finally connected to the indoor air pipe 210 through the third filter.

[0078] The first electronic expansion valve 110 has a bypass function, while the second electronic expansion valve 120 does not. In the same electronic expansion valve device, the control logic and control mode of each electronic expansion valve are completely identical.

[0079] In the same electronic expansion valve unit 100, the first electronic expansion valve 110 and the second electronic expansion valve 120 will not operate simultaneously.

[0080] Reference Figure 1 As shown, when the indoor unit is in cooling mode, the refrigerant flows back from the indoor side to the second electronic expansion valve 120, and then reaches the outdoor side.

[0081] Reference Figure 2 As shown, when the indoor unit is in heating mode, the second electronic expansion valve 120 is in a closed state, and the refrigerant passes through the first filter 130 and the first electronic expansion valve 110 and then enters the indoor unit after reaching the third filter 150.

[0082] Reference Figure 7 and Figure 8 The figures shown are schematic diagrams of a four-in-four-out electronic expansion valve device and a 12-in-12-out electronic expansion valve device, respectively.

[0083] In some embodiments of this application, reference is made to Figure 3 As shown, it is a schematic diagram of the refrigerant flow principle of a multi-inlet and multi-outlet electronic expansion valve device.

[0084] Each electronic expansion valve unit 100 is connected to a different indoor unit and is connected in parallel with each other. Each indoor unit can be connected to one or more indoor units.

[0085] In this electronic expansion valve device, there is one first filter 130 and one second filter 140, and the number of the third filter 150 is the same as the number of electronic expansion valve units.

[0086] Reference Figure 3 As shown, when all indoor units are in cooling mode, the refrigerant in each electronic expansion valve unit flows back to the second electronic expansion valve 120 from the indoor side and then reaches the outdoor side.

[0087] Reference Figure 4 As shown, when all indoor units are in heating mode, the second electronic expansion valve in each electronic expansion valve unit is in a locked state, and the refrigerant flows through the first filter 130 and the first electronic expansion valve 110 to the third filter 150 before entering the indoor unit.

[0088] Reference Figure 5 As shown, when each indoor unit is partially cooling and partially heating, specifically, the indoor units on the first and third indoor sides are in heating mode, and the indoor unit on the second indoor side is in cooling mode;

[0089] The high and low pressure gas on the outdoor side passes through the first filter 130 and then reaches the first electronic expansion valve 110 of the first electronic expansion valve unit 101, and then passes through the third filter to reach the first indoor side for heating; at the same time, the high and low pressure gas on the outdoor side passes through the first filter 130 and then reaches the first electronic expansion valve 110 of the third electronic expansion valve unit 103, and then passes through the third filter to reach the third indoor side for heating.

[0090] After the refrigerant heats the first and third indoor chambers, it is recovered through the indoor liquid pipe 220 to the second indoor chamber for cooling. In addition, the refrigerant flowing out of the compressor passes through the outdoor heat exchanger and then through the outdoor liquid pipe 330 to the indoor liquid pipe 220, and then enters the second indoor chamber for heat exchange, thereby ensuring the cooling effect of the second indoor chamber.

[0091] After the refrigerant completes cooling on the second indoor side, it flows through the third filter 150 in the second electronic expansion valve unit 102, then through the second electronic expansion valve 120 and the second filter 140, before entering the outdoor low-pressure gas pipe 320, and finally returns to the compressor to complete the refrigerant cycle.

[0092] In some embodiments of this application, the general instructions for the control module to set the opening degree of different electronic expansion valves include the following:

[0093] Reference Figure 9 and Figure 10As shown, the control module can determine the correspondence between flow rate and valve opening pulse based on the flow curve of each electronic expansion valve; that is, determine the correspondence between the valve opening pulses of each electronic expansion valve under the same opening degree.

[0094] Then, when setting a specific opening degree, that is, when different electronic expansion valves are at the same flow rate, characters can be used as a general command for that opening degree. The characters can be letters or other symbols.

[0095] In a multi-input, multi-output system, the control module sends an A-opening command to each electronic expansion valve device. Each electronic expansion valve then selects an appropriate number of adjustment steps according to its own adjustment step size and corresponding relationship, thereby achieving the adjustment of the same opening degree in different electronic expansion valve devices, that is, realizing the universality of adjustment.

[0096] In some embodiments of this application, the states of the electronic expansion valve include a first opening state, a second opening state, a zero-point reset state, and a compensation opening state; different electronic expansion valves use the same general commands in the same state.

[0097] In some embodiments of this application, when the electronic expansion valve is in a first opening state, its opening degree is not less than the opening degree when the electronic expansion valve is in a second opening state.

[0098] The following examples illustrate the installation of a 6000-step deceleration electronic expansion valve and a 500-step direct-acting electronic expansion valve. If the electronic expansion valve between the indoor and outdoor units is a 6000-step deceleration electronic expansion valve, it will now be changed to a 500-step direct-acting electronic expansion valve.

[0099] First, by changing the state of the DSW4 switches, for example, setting DSW4-1, DSW4-2, DSW4-3, and DSW4-4 to the OFF position, the system executes the 500-step valve control mode. To achieve a universal control mode, a specific opening degree is represented by a letter. Different valve bodies operating at the same flow rate use the same letter to represent the valve opening degree, thus ensuring the generalization of control content. The specific correspondence is shown in the table below.

[0100]

[0101] Wherein, MVS is the second electronic expansion valve 120, MVD is the first electronic expansion valve 110; EVCHmax is the first opening state, EVCHmin is the second opening state, EVCHresetOFF is the zero-point reset state, and EVCHoffset is the compensation opening state.

[0102] As shown in the table above, the general control command corresponding to the first opening state is opening A. Specifically, the 6000-step valve executes opening A1 and the 500-step valve executes opening A2. The general control command corresponding to the second opening state is opening B. Specifically, the 6000-step valve executes opening B1 and the 500-step valve executes opening B2.

[0103] In the zero-point reset state, the corresponding general control command is C opening degree. Specifically, the 6000-step valve executes C1 opening degree, and the 500-step valve executes C2 opening degree.

[0104] The general control command corresponding to the compensated opening state is D opening. Specifically, the 6000-step valve executes D1 opening, and the 500-step valve executes D2 opening.

[0105] For example, if the state of the electronic expansion valve device of the current 6000-step valve needs to be switched from the first opening state to the second opening state of the electronic expansion valve of the 500-step valve, the control module can send the B2 opening command to the electronic expansion valve of the 500-step valve according to the corresponding relationship to complete the switch.

[0106] In some embodiments of this application,

[0107] During initialization, the opening degree of the electronic expansion valve is set according to the state of the DIP switch; after initialization, the air conditioning system enters the normal control mode, and the opening degree of the electronic expansion valve is determined by the state of the DIP switch and the operating mode of the indoor and outdoor units.

[0108] In normal control mode, the opening degree of the electronic expansion valve is selected based on the outdoor unit status (d1-09, compressor status, ON or OFF) and the indoor unit operating mode (cooling or heating). The opening degree is indicated by the letters SD-MAX, D-MAX, and S-MAX. MVS and MVD determine the final valve opening steps according to different priorities based on the indoor and outdoor unit operating status. The priority settings and specific electronic expansion valve opening degrees are shown in the table below.

[0109]

[0110] When d1-09 is in the ON state, the control module defines it as the first priority. If it is necessary to set MVS to the first opening state, the control module sends an A opening command to MVS, and at this time, MVD executes the opening q1 accordingly. If it is necessary to set MVD to the first opening state, the control module sends an A opening command to MVD, and at this time, MVS executes the opening q1 accordingly.

[0111] When the normal opening condition is met, the control module defines it as the second priority. If it is necessary to set the MVS to the first opening state, the control module sends an A opening command to the MVS and a B opening command to the MVD. If it is necessary to set the MVD to the first opening state, the control module sends an A opening command to the MVD and sends a B opening command to the MVS.

[0112] When the conditions for equalization are met, the control module defines it as the third priority. If it is necessary to set the MVS to the first opening state, the control module sends an intermediate opening command to the MVS and a B opening command to the MVD. If it is necessary to set the MVD to the first opening state, the control module sends an intermediate opening command to the MVD and sends a B opening command to the MVS.

[0113] In some embodiments of this application,

[0114] The control module is also used to implement pressure equalization control when switching the opening degree of the electronic expansion valve; the pressure equalization control includes a general instruction for setting the pressure equalization pulse.

[0115] In some embodiments of this application,

[0116] In normal control mode, the third priority is the establishment of pressure equalization conditions. The conditions for pressure equalization are: if the opening of the electronic expansion valve device in the air conditioning system switches from S-MAX to D-MAX, the valve body opening changes from minimum to maximum, the refrigerant pressure will change in a short time, and the refrigerant flow through the valve body will also change from minimum to maximum. Under this condition, refrigerant flow noise is easily generated, so the control module needs to perform pressure equalization control.

[0117] The control module is set to an intermediate opening, which can mitigate sudden changes in refrigerant flow pressure and resistance caused by changes in control mode, and prevent the generation of refrigerant flow noise; it also implements pressure equalization control to prevent noise problems that occur under specific pulse conditions during the pressure equalization transition phase.

[0118] In some embodiments of this application,

[0119] The control module is also used to determine the pressure equalization pulse of the electronic expansion valve during the pressure equalization control process by setting the state of the DIP switch.

[0120] Similarly, taking the installation of a 6000-step deceleration electronic expansion valve device and a 500-step direct-acting electronic expansion valve device as examples, the pressure equalization control corresponds to four different flow states. Switching between the four pressure equalization flow states is achieved through the DSW1 DIP switch. Letters are used to represent specific flow rates; the same letter symbol represents different valve opening pulse counts for the same flow rate in different valve bodies, thus achieving generalization of the control content. The generalized flow correspondence is shown in the table below.

[0121]

[0122] In some embodiments of this application,

[0123] The equalizing pulse of the electronic expansion valve satisfies the following formula:

[0124] The equalizing pulse (n) = the number of steps in the compensated opening state + β × n;

[0125] Wherein, β is a constant, and β is related to the type of the electronic expansion valve; n takes the value (0, 1, 2, 3), and n represents the state of the DIP switch.

[0126] Regarding the 6000-step deceleration electronic expansion valve device and the 500-step direct-acting electronic expansion valve device in the above embodiments;

[0127] The pressure equalization pulse relationship of the 6000-step deceleration electronic expansion valve device is as follows:

[0128] f1(n)=H1+100×n; (n=0, 1, 2, 3)

[0129]

[0130] Where H1 = D1,

[0131] When n=0, positions 3 and 4 of DSW1 are in the ON state;

[0132] When n=1, position 3 of DSW1 is in the off state and position 4 is in the on state;

[0133] When n=2, position 3 of DSW1 is in the on state and position 4 is in the off state;

[0134] When n=3, positions 3 and 4 of the DSW1 switch are in the off state.

[0135] When using a 500-step direct-acting electronic expansion valve device for pressure equalization control, the number of pulses required for pressure equalization can be determined by matching the CV curves of the 6000-step deceleration electronic expansion valve device and the 500-step direct-acting electronic expansion valve device with the flow rate of the 6000-step deceleration electronic expansion valve device.

[0136] The equalizing pulse relationship of the 500-step direct-acting electronic expansion valve device is as follows:

[0137] f2(n)=H2+5×n; (n=0, 1, 2, 3)

[0138]

[0139] In some embodiments of this application,

[0140] Under a certain DIP switch, the equalization pulse of the electronic expansion valve = the number of steps in the compensation opening state - the number of steps in the second opening state.

[0141] For the 500-step direct-acting electronic expansion valve device in the above embodiment, the direct-acting 500-step valve body produced by Sanhua is used. When positions 3 and 4 of the DSW1 are in the on state, its equalizing pulse H2 = D2 - B2.

[0142] In some embodiments of this application, the control module is further configured to adjust the electronic expansion valve according to the correspondence and flow curve.

[0143] When the electronic expansion valve device needs to be switched, the control module will make a small adjustment to a certain flow rate in the control content based on the flow curve relationship and flow curve characteristics of different valves, so as to ensure the function is realized while avoiding valve opening pulses that may cause noise.

[0144] In some embodiments of this application,

[0145] The control module is also used to adjust the electronic expansion valve according to the correspondence and flow curve, including:

[0146] Select the corresponding adjustment value based on the state of the DIP switch;

[0147] The initial equalization pulse under the equalization conditions is added to the adjustment value, and the sum is taken as the final equalization pulse.

[0148] Regarding the 500-step direct-acting electronic expansion valve device in the above embodiments, the pressure equalization control flow rate can be slightly adjusted according to the characteristics of the valve body itself. For example, its final pressure equalization control pulse is:

[0149]

[0150] No adjustment is required when positions 3 and 4 of the DSW1 DIP switch are in the ON state.

[0151] When DSW1's DIP switch is in the off state at position 3 and in the on state at position 4, it is necessary to subtract 1 from the initial equalization pulse.

[0152] When DSW1's DIP switch is in the ON position (position 3) and the OFF position (position 4), no adjustment is required.

[0153] When positions 3 and 4 of the DSW1 DIP switch are in the off state, an additional 3 pulses need to be added to the initial equalization pulse.

[0154] Based on this invention, solutions that achieve the same effect by replacing different types of electronic expansion valves and changing the number of valve opening pulses are considered extensions of this invention.

[0155] As an extension solution, the PAM-type 2000 electronic expansion valve is applied to this electronic expansion valve device, which can also be used with the heat recovery unit to realize the function of simultaneous cooling and heating of the indoor unit.

[0156] As an extension solution, the PAM-type 2000 electronic expansion valve is applied to the electronic expansion valve device. Based on the correspondence between the expansion valve and the flow rate of the 500-step or 6000-step electronic expansion valve, the control mode of the electronic expansion valve of the device can be generalized, ensuring the continuity of the board software and simplifying off-site maintenance.

[0157] In some embodiments of this application, an air conditioning system is provided, including:

[0158] Indoor module 200, which includes at least one indoor unit;

[0159] Outdoor module 300, which includes outdoor high and low pressure air pipes 310 and outdoor low pressure air pipes 320;

[0160] An expansion valve device, comprising multiple sets of electronic expansion valve units 100;

[0161] A control module, wherein each of the electronic expansion valve units 100 is communicatively connected, the control module includes a normal control mode and a pressure equalization control mode;

[0162] The control module is used to set the general instructions in the normal control mode and the pressure equalization control mode.

[0163] Compared with the prior art, the advantages and positive effects of the present invention are:

[0164] This invention enables the use of the same baseboard software in the same project to switch between different electronic expansion valve devices through corresponding DIP switch settings and other control functions. This ensures the continuity of the baseboard software, avoids noise problems that may occur in the valve body under specific flow rates, and simplifies the complexity of off-site maintenance.

[0165] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0166] 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. Air conditioning system, including: An indoor module, which includes at least one indoor unit; The outdoor module includes outdoor high and low pressure gas pipes and outdoor low pressure gas pipes; An expansion valve device includes at least one set of electronic expansion valve units; the electronic expansion valve unit includes a first electronic expansion valve and a second electronic expansion valve; the first electronic expansion valve and the second electronic expansion valve are connected in parallel. On the outdoor side, the first electronic expansion valve is connected to the outdoor high and low pressure gas pipes; the second electronic expansion valve is connected to the outdoor low pressure gas pipe. The feature is that it also includes a control module, which is communicatively connected to each of the electronic expansion valve units. The control module is used to determine the correspondence between flow rate and valve opening pulse according to the flow curve of different electronic expansion valves, and to realize the universalization of control of different electronic expansion valves by using character settings based on the correspondence.

2. The air conditioning system according to claim 1, characterized in that, The control module is also used to implement pressure equalization control when switching the opening degree of the electronic expansion valve; the pressure equalization control includes a general instruction for setting the pressure equalization pulse.

3. The air conditioning system according to claim 1, characterized in that, The control module is also used to determine the correspondence between each electronic expansion valve at the same opening degree based on the flow curve of the electronic expansion valve; the control module is also used to adjust the electronic expansion valve based on the correspondence and the flow curve.

4. The air conditioning system according to claim 2, characterized in that, The states of the electronic expansion valve include a first opening state, a second opening state, a zero-point reset state, and a compensation opening state; different electronic expansion valves use the same general commands in the same state.

5. The air conditioning system according to claim 3, characterized in that, The control module is also used to determine the pressure equalization pulse of the electronic expansion valve during the pressure equalization control process by setting the state of the DIP switch.

6. The air conditioning system according to claim 5, characterized in that, The equalizing pulse of the electronic expansion valve satisfies the following formula: The equalizing pulse (n) = the number of steps in the compensation opening state + β × n; Where β is a constant and is related to the type of the electronic expansion valve; n takes the value (0, 1, 2, 3), and n represents the state of the DIP switch.

7. The air conditioning system according to claim 5, characterized in that, The control module is also used to adjust the electronic expansion valve according to the correspondence and flow curve, including: Select the corresponding adjustment value based on the state of the DIP switch; The initial equalization pulse under the equalization conditions is added to the adjustment value to obtain the equalization pulse.

8. The air conditioning system according to claim 5, characterized in that, Under a certain DIP switch, the equalization pulse of the electronic expansion valve = the number of steps in the compensation opening state - the number of steps in the second opening state.

9. The air conditioning system according to claim 1, characterized in that, The electronic expansion unit includes a first filter, a second filter, and a third filter; the first filter is installed on the pipeline connecting the first electronic expansion valve to the outdoor high and low pressure gas pipes; the second filter is installed on the pipeline connecting the second electronic expansion valve to the outdoor low pressure gas pipes; and the third filter is located on the connecting pipeline of the indoor gas pipes.

10. Air conditioning system, including: An indoor module, which includes at least one indoor unit; The outdoor module includes outdoor high and low pressure gas pipes and outdoor low pressure gas pipes; An expansion valve device, comprising at least one set of electronic expansion valve units; The feature is that it further includes a control module, which is communicatively connected to each of the electronic expansion valve units, the control module including a normal control mode and a pressure equalization control mode; The control module is used to set the general instructions in the normal control mode and the pressure equalization control mode.

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