Integrated electronic expansion valve, air conditioning system and control method and control device of air conditioning system

Abstract

The invention provides an integrated electronic expansion valve, an air conditioning system and a control method and device of the air conditioning system. The expansion valve comprises a valve body pipe, a first connector and a second connector are formed in the two ends of the valve body pipe respectively, a one-way valve is arranged in the valve body pipe, and the valve direction of the one-way valve is oriented from the first connector to the second connector; a first connecting pipe and a second connecting pipe are further connected to the peripheral wall of the valve body pipe, the first connecting pipe, the second connecting pipe and the one-way valve are connected in parallel, a first expansion valve is arranged on the first connecting pipe, and a second expansion valve is arranged on the second connecting pipe; in the refrigeration mode, the first connector is used for allowing refrigerants to enter and the second connector to flow out. In the heating mode, the second connector is used for refrigerant inflow and refrigerant outflow through the first connector. By means of the integrated electronic expansion valve, the throttling effect of the outdoor unit in the heating mode can be achieved, large refrigerant flow in the refrigerating mode can be guaranteed, fine refrigerant regulation and control of the system are facilitated, and meanwhile the cost of the system can be reduced accordingly due to the fact that the integrated electronic expansion valve is simple in structure.

Description

Technical Field

[0001] The present invention relates to the field of electrical equipment technology, and in particular to an integrated electronic expansion valve, an air conditioning system, and a control method and a control device thereof. Background Art

[0002] In the related art, air conditioners, as an electrical appliance that changes indoor temperature and humidity, have been widely used in people's lives in recent years. At present, simplifying the internal structure of air conditioners is one of the main directions of future development. In the existing air conditioning structure scheme, in order to achieve the throttling effect of the outdoor unit in the heating mode and ensure a larger refrigerant flow in the cooling mode (reduce pressure loss), a structure in which an electronic expansion valve and a one-way valve are connected in parallel is usually designed at the liquid inlet pipe assembly of the outdoor unit condenser. Its main purpose is that in the cooling mode, the one-way valve is turned on and the electronic expansion valve is opened, and the parallel one-way valve pipe group and the electronic expansion valve pipe group can ensure a larger high-temperature and high-pressure gaseous refrigerant flow; in the heating mode, the one-way valve is closed, and the throttling effect of the refrigerant is controlled only by the opening and closing of the electronic expansion valve. The above structure achieves the normal flow of the refrigerant without increasing the specifications of the electronic expansion valve.

[0003] Regarding the above-mentioned parallel structure of the one-way valve and the electronic expansion valve, there is currently a solution to use a large-sized electronic expansion valve to replace the above structure, but it requires a relatively high cost and has a low utilization rate; especially under small load operating conditions, it is not conducive to the precise control of the refrigerant amount. Summary of the invention

[0004] The present invention provides an integrated electronic expansion valve, an air-conditioning system, and a control method and a control device thereof, in order to solve the defects existing in the prior art and achieve the following effects: through an integrated electronic expansion valve, not only the throttling effect of the outdoor unit in the heating mode can be achieved, but also a larger refrigerant flow rate can be ensured in the cooling mode, which is beneficial to the refined refrigerant control of the system. At the same time, due to its simple structure, the cost of the system will also be reduced accordingly.

[0005] An integrated electronic expansion valve according to an embodiment of the first aspect of the present invention comprises:

[0006] A valve body tube, with a first interface and a second interface formed at both ends thereof, a one-way valve is arranged inside the valve body tube, and a valve direction of the one-way valve is oriented from the first interface to the second interface;

[0007] A first connecting pipe and a second connecting pipe are also connected to the outer peripheral wall of the valve body pipe, the first connecting pipe, the second connecting pipe and the one-way valve are connected in parallel with each other, and the first connecting pipe is provided with a first expansion valve, and the second connecting pipe is provided with a second expansion valve;

[0008] Among them, in the cooling mode of the air-conditioning system, the first interface is used for refrigerant to enter and the second interface is used for refrigerant to flow out; in the heating mode of the air-conditioning system, the second interface is used for refrigerant to flow in and the first interface is used for refrigerant to flow out.

[0009] An air conditioning system according to a second aspect of the present invention includes:

[0010] A compressor, an indoor heat exchanger, an outdoor heat exchanger and a four-way valve connected by a refrigerant pipeline;

[0011] As described in the embodiment of the first aspect of the present invention, the first interface of the integrated electronic expansion valve is connected to the outdoor heat exchanger and the second interface is connected to the indoor heat exchanger.

[0012] According to a third aspect of the present invention, a control method for an air conditioning system based on the second aspect of the present invention comprises:

[0013] Acquiring a target operating mode that the air-conditioning system needs to enter, and operating parameters of the air-conditioning system under the target operating mode;

[0014] According to the target working mode, the opening and closing of the first expansion valve and / or the second expansion valve are controlled, and the opening degrees of the first expansion valve and the second expansion valve are adjusted according to the working parameters in the target working mode.

[0015] According to an embodiment of the present invention, the step of determining whether the first expansion valve and / or the second expansion valve is opened or closed according to the target working mode specifically includes:

[0016] Determining that the target working mode is the cooling mode, controlling both the first expansion valve and the second expansion valve to be opened;

[0017] If it is determined that the target working mode is the heating mode, at least one of the first expansion valve and the second expansion valve is controlled to be opened, and the valve that is opened or opened first among the first expansion valve and the second expansion valve is used as the main valve and the other as the slave valve.

[0018] According to an embodiment of the present invention, the target working mode is a heating mode, and the working parameters include an initial load rate of the air-conditioning system when entering the heating mode. Then, the step of adjusting the openings of the first expansion valve and the second expansion valve according to the working parameters in the target working mode specifically includes:

[0019] Determining, according to the interval range of the initial load rate, an initial master valve opening of the master valve when entering the heating mode and an initial slave valve opening of the slave valve when entering the heating mode;

[0020] When entering the heating mode, the main valve is controlled to be maintained at the initial main valve opening, and the slave valve is controlled to be maintained at the initial slave valve opening.

[0021] According to an embodiment of the present invention, the step of determining the initial master valve opening of the master valve when entering the heating mode and the initial slave valve opening of the slave valve when entering the heating mode according to the interval range of the initial load rate specifically includes:

[0022] When the initial load rate is less than or equal to the standard load rate, the initial slave valve opening is determined to be zero, the initial main valve opening is greater than zero, and the initial load rate is positively correlated with the initial main valve opening;

[0023] When the initial load rate is greater than the standard load rate, it is determined that the initial slave valve opening and the initial main valve opening are both greater than zero, and the sum of the initial main valve opening and the initial slave valve opening is positively correlated with the initial load rate.

[0024] According to an embodiment of the present invention, when the initial load rate is greater than the standard load rate, the initial master valve opening is equal to the initial slave valve opening.

[0025] According to one embodiment of the present invention, after the step of controlling the main valve to maintain at the initial main valve opening and controlling the slave valve to maintain at the initial slave valve opening when entering the heating mode, the method further includes:

[0026] When the air conditioning system operates in a heating mode, the condensation superheat of the condenser is obtained once every set detection time;

[0027] The opening of the main valve is adjusted according to the interval range of the condensation superheat, and the opening of the slave valve is adjusted when the slave valve is opened.

[0028] According to an embodiment of the present invention, the step of adjusting the opening of the main valve according to the interval range of the condensing superheat, and adjusting the opening of the slave valve when the slave valve is opened, specifically includes:

[0029] According to the condensing superheat being less than or equal to the first superheat, the main valve is controlled to reduce the first change value based on the current opening, and the slave valve is controlled to reduce the first change value based on the current opening when the slave valve is opened;

[0030] According to the condensing superheat being greater than the first superheat and less than or equal to the second superheat, the main valve is controlled to reduce the second change value based on the current opening, and the slave valve is controlled to reduce the second change value based on the current opening when the slave valve is open;

[0031] According to the condensation superheat being greater than the second superheat and less than or equal to the third superheat, controlling the main valve to maintain the current opening unchanged;

[0032] According to the condensation superheat being greater than the third superheat, the main valve is controlled to increase the third change value based on the current opening, and the slave valve is controlled to increase the third change value based on the current opening when the slave valve is opened;

[0033] The first change value is greater than the second change value.

[0034] According to an embodiment of the present invention, the step of adjusting the opening of the main valve according to the interval range of the condensing superheat, and adjusting the opening of the slave valve when the slave valve is opened, specifically includes:

[0035] When the condensing superheat is less than the first superheat for three consecutive times, and the current opening of the main valve and the current opening of the slave valve are both less than the first preset opening and both greater than zero, the opening of the main valve is controlled to be adjusted to N1 times (N1>1) of the current opening, and the slave valve is controlled to be closed;

[0036] When the condensing superheat is greater than the third superheat for three consecutive times, the current opening of the main valve is greater than the second preset opening, and the slave valve is closed, the slave valve is controlled to open, and the openings of the main valve and the slave valve are controlled to be adjusted to N2 times (N2<1) of the current opening, respectively.

[0037] According to one embodiment of the present invention, after the step of controlling the main valve to maintain at the initial main valve opening and controlling the slave valve to maintain at the initial slave valve opening when entering the heating mode, the method further includes:

[0038] When the air-conditioning system operates in the heating mode, obtaining load rate change information of the air-conditioning system;

[0039] The openings of the master valve and the slave valve are adjusted according to the load factor change information.

[0040] According to an embodiment of the present invention, the step of adjusting the opening of the main valve and the slave valve according to the load rate change information specifically includes:

[0041] When the load rate changes from above the standard load rate to below the standard load rate within a set time period, the slave valve is controlled to close, and the opening of the main valve is re-determined according to the changed load rate;

[0042] When the load rate changes from below the standard load rate to above the standard load rate within a set time period, the slave valve is controlled to open, and the openings of the main valve and the slave valve are re-determined according to the changed load rate.

[0043] According to a fourth aspect of the present invention, a control device for an air conditioning system based on the second aspect of the present invention comprises:

[0044] An acquisition module, used for acquiring a target operating mode that the air-conditioning system needs to enter, and operating parameters of the air-conditioning system under the target operating mode;

[0045] A control module is used to control the opening and closing of the first expansion valve and / or the second expansion valve according to the target working mode, and to adjust the opening of the first expansion valve and the second expansion valve according to the working parameters in the target working mode.

[0046] In order to solve the technical defects existing in the above-mentioned related technologies, the present invention provides an integrated electronic expansion valve, which integrates two small-sized electronic expansion valves and a one-way valve into one component to achieve the purpose of integrated design. In this way, through an integrated electronic expansion valve, not only the throttling effect of the outdoor unit in the heating mode can be achieved, but also a larger refrigerant flow rate in the cooling mode can be guaranteed, which is beneficial to the system's refined refrigerant control. At the same time, due to its simple structure, the cost of the system will also be reduced accordingly.

[0047] The control method and control device of the air-conditioning system of the present invention analyze the working mode and working parameters and control the opening and closing status and opening adjustment of the integrated electronic expansion valve in the system, thereby not only achieving the throttling effect of the outdoor unit in the heating mode, but also ensuring a larger refrigerant flow in the cooling mode, which is beneficial to the refined refrigerant control of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 It is a structural schematic diagram of the integrated electronic expansion valve provided by the present invention;

[0050] Figure 2 is a flow chart of a control method for an air conditioning system provided by the present invention;

[0051] Figure 3is a schematic structural diagram of a control device for an air conditioning system provided by the present invention;

[0052] Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention.

[0053] Reference numerals:

[0054] 1. Valve body tube; 11. First interface; 12. Second interface;

[0055] 2. One-way valve; 3. First connecting pipe; 31. First expansion valve; 4. Second connecting pipe; 41. Second expansion valve. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0058] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0059] The following describes an integrated electronic expansion valve, air-conditioning system, and its control method and control device provided by the present invention with reference to the accompanying drawings, wherein the air-conditioning system includes an integrated electronic expansion valve, and the control method and control device of the present invention are both implemented based on the air-conditioning system as a structural basis.

[0060] like Figure 1 As shown, the integrated electronic expansion valve according to the first embodiment of the present invention includes a valve body tube 1, a one-way valve 2, a first connecting tube 3, a first expansion valve 31, a second connecting tube 4 and a second expansion valve 41.

[0061] A first interface 11 and a second interface 12 are respectively formed at both ends of the valve body tube 1 . A one-way valve 2 is arranged inside the valve body tube 1 . The valve direction of the one-way valve 2 is oriented from the first interface 11 to the second interface 12 .

[0062] The outer wall of the valve body tube 1 is also connected to a first connecting pipe 3 and a second connecting pipe 4 . The first connecting pipe 3 , the second connecting pipe 4 and the one-way valve 2 are connected in parallel to each other. The first connecting pipe 3 is provided with a first expansion valve 31 , and the second connecting pipe 4 is provided with a second expansion valve 41 .

[0063] In the cooling mode of the air-conditioning system, the first interface 11 is used for refrigerant to enter and the second interface 12 is used for refrigerant to flow out; in the heating mode of the air-conditioning system, the second interface 12 is used for refrigerant to flow in and the first interface 11 is used for refrigerant to flow out.

[0064] According to the integrated electronic expansion valve of an embodiment of the present invention, taking the integrated electronic expansion valve installed in an air-conditioning system as an example, its specific working principle is as follows: the first interface 11 of the valve body pipe 1 is connected to the outdoor heat exchanger of the air-conditioning system, and the second interface 12 of the valve body pipe 1 is connected to the indoor heat exchanger of the air-conditioning system. In the cooling mode, the outdoor heat exchanger acts as a condenser, and the refrigerant therein flows into the valve body tube 1 from the first interface 11. At this time, the refrigerant has three branches in the valve body tube 1, which are the one-way valve 2, the first connecting pipe 3 and the second connecting pipe 4. At this time, the one-way valve 2 allows the refrigerant to flow smoothly from the first interface 11 to the second interface 12. At this time, the first expansion valve 31 and the second expansion valve 41 can be adjusted in opening according to actual needs, so that a larger refrigerant flow rate can be guaranteed in the cooling mode; in the heating mode, the indoor heat exchanger acts as a condenser, and the refrigerant therein flows into the valve body tube 1 from the second interface 12. At this time, the one-way valve 2 is not conductive, so the refrigerant has two branches in the valve body tube 1, which are the first connecting pipe 3 and the second connecting pipe 4. At this time, the first expansion valve 31 and the second expansion valve 41 can be adjusted in opening according to actual needs, so that the throttling effect of the outdoor unit in the heating mode can be achieved.

[0065] In the related art, air conditioners, as an electrical appliance that changes indoor temperature and humidity, have been widely used in people's lives in recent years. At present, simplifying the internal structure of air conditioners is one of the main directions of future development. In the existing air conditioning structure scheme, in order to achieve the throttling effect of the outdoor unit in the heating mode and ensure a larger refrigerant flow in the cooling mode (reduce pressure loss), a structure in which an electronic expansion valve and a one-way valve are connected in parallel is usually designed at the liquid inlet pipe assembly of the outdoor unit condenser. Its main purpose is that in the cooling mode, the one-way valve is turned on and the electronic expansion valve is opened, and the parallel one-way valve pipe group and the electronic expansion valve pipe group can ensure a larger high-temperature and high-pressure gaseous refrigerant flow; in the heating mode, the one-way valve is closed, and the throttling effect of the refrigerant is controlled only by the opening and closing of the electronic expansion valve. The above structure achieves the normal flow of the refrigerant without increasing the specifications of the electronic expansion valve.

[0066] Regarding the above-mentioned parallel structure of the one-way valve and the electronic expansion valve, there is currently a solution to use a large-sized electronic expansion valve to replace the above structure, but it requires a relatively high cost and has a low utilization rate; especially under small load operating conditions, it is not conducive to the precise control of the refrigerant amount.

[0067] In summary, in order to solve the technical defects existing in the above-mentioned related technologies, the present invention provides an integrated electronic expansion valve, which integrates two small-sized electronic expansion valves and a one-way valve 2 into a component to achieve the purpose of integrated design. In this way, through an integrated electronic expansion valve, not only the throttling effect of the outdoor unit in the heating mode can be achieved, but also a larger refrigerant flow rate in the cooling mode can be guaranteed, which is beneficial to the system's refined refrigerant control. At the same time, due to its simple structure, the cost of the system will also be reduced accordingly.

[0068] A specific embodiment of the integrated electronic expansion valve of the present invention is described below with reference to the accompanying drawings.

[0069] For the specific structure, see Figure 1 , two groups of flanging holes corresponding to the openings on both sides of the valve body tube 1, each group of flanging holes includes two flanging holes, one group of flanging holes is used to connect the inlet and outlet of the first connecting pipe 3, and the other group of flanging holes is used to connect the inlet and outlet of the second connecting pipe 4, and the purpose of using flanging holes is mainly to improve the connection strength. The one-way valve 2 is arranged between the upper and lower flanging holes, and the two ends of the valve body tube 1 form a first interface 11 and a second interface 12 respectively, wherein the second interface 12 is the refrigerant inlet in the heating mode (the refrigerant flow direction in the heating mode), and the first interface 11 is the refrigerant inlet in the cooling mode (the refrigerant flow direction in the cooling mode).

[0070] In the cooling mode, the high-pressure liquid refrigerant condensed by the outdoor condenser flows through the integrated electronic expansion valve from the cooling mode refrigerant inlet (i.e., the first interface 11). At this time, the one-way valve 2 is in the on state, and the first expansion valve 31 and the second expansion valve 41 can be adjusted in opening according to actual needs.

[0071] In the heating mode, the refrigerant condensed by the indoor unit module flows through the heating mode refrigerant inlet (i.e., the second interface 12) and the integrated electronic expansion valve. At this time, the one-way valve 2 is in a closed state, and the first expansion valve 31 and the second expansion valve 41 can be adjusted in opening according to actual needs.

[0072] like Figure 1 As shown, the air conditioning system according to the second embodiment of the present invention includes a compressor, a condenser, an evaporator and a four-way valve, and also includes an integrated electronic expansion valve as described in the first embodiment of the present invention.

[0073] The compressor, condenser, evaporator and four-way valve are connected through a refrigerant pipeline, the first interface 11 of the integrated electronic expansion valve is connected to the outdoor heat exchanger and the second interface 12 is connected to the indoor heat exchanger.

[0074] The air-conditioning system according to the embodiment of the present invention replaces the structure of the large-sized electronic expansion valve in the prior art with an integrated electronic expansion valve, which has low cost and is more convenient for achieving precise control of the amount of refrigerant. In addition, the air-conditioning system of the present invention can not only achieve the throttling effect of the outdoor unit in the heating mode, but also ensure a larger refrigerant flow in the cooling mode.

[0075] The control method and control device of the air-conditioning system proposed in the present invention are described below with reference to the accompanying drawings. Before describing the embodiments of the present invention in detail, the entire application scenario is described first. The control method, control device, electronic device and computer-readable storage medium of the air-conditioning system of the embodiments of the present invention can be applied to the local air-conditioning system, the cloud platform in the Internet field, or other types of cloud platforms in the Internet field, or can also be applied to third-party devices. Third-party devices may include various types such as mobile phones, tablet computers, notebooks, car computers and other smart terminals.

[0076] The following description only takes the control method applicable to the air-conditioning system as an example. It should be understood that the control method of the embodiment of the present invention can also be applied to the cloud platform and third-party equipment.

[0077] It should also be noted that the control method of the air-conditioning system proposed in the present invention is universal, that is, the method is applicable to cooling or heating the air-conditioning in a low-temperature environment or a high-temperature environment.

[0078] like Figure 2As shown, according to the third aspect of the present invention, the control method of the air conditioning system based on the second aspect of the present invention comprises:

[0079] Step S1, obtaining a target working mode that the air-conditioning system needs to enter, and working parameters of the air-conditioning system under the target working mode;

[0080] Step S2, according to the target working mode, controlling the opening and closing of the first expansion valve 31 and / or the second expansion valve 41, and adjusting the opening of the first expansion valve 31 and the second expansion valve 41 according to the working parameters in the target working mode.

[0081] According to the control method of the air-conditioning system of an embodiment of the present invention, its working process is as follows: first, it is necessary to determine the target working mode that the air-conditioning system is about to enter. Under different target working modes, the opening and closing conditions of the first expansion valve 31 and the second expansion valve 41 are different. For example, in the heating mode, at least one of the first expansion valve 31 and the second expansion valve 41 is opened, so as to ensure the normal flow of the refrigerant in the heating mode and achieve the throttling effect when the one-way valve 2 is not conductive; in the cooling mode, the first expansion valve 31 and the second expansion valve 41 are all opened, so as to ensure a larger refrigerant flow in the cooling mode.

[0082] Furthermore, corresponding operating parameters are obtained under different target operating modes, so that after the air-conditioning system formally enters the target operating mode, the controller can make targeted adjustments to the openings of the first expansion valve 31 and the second expansion valve 41 according to the specific operating parameters.

[0083] In summary, according to the control method of the air-conditioning system in an embodiment of the present invention, the working mode and working parameters are analyzed and the opening and closing status and opening adjustment of the integrated electronic expansion valve in the system are controlled, thereby not only achieving the throttling effect of the outdoor unit in the heating mode, but also ensuring a larger refrigerant flow in the cooling mode, which is beneficial to the system's refined refrigerant control.

[0084] According to some embodiments of the present invention, the step of determining whether the first expansion valve 31 and / or the second expansion valve 41 is opened or closed according to the target working mode specifically includes:

[0085] When the target working mode is determined to be the cooling mode, the first expansion valve 31 and the second expansion valve 41 are controlled to be opened;

[0086] When the target working mode is determined to be the heating mode, at least one of the first expansion valve 31 and the second expansion valve 41 is controlled to be open, and the valve that is opened or opened first among the first expansion valve 31 and the second expansion valve 41 is used as the main valve and the other as the slave valve.

[0087] In this way, in the refrigeration mode, the refrigerant enters the valve body tube 1 from the first interface 11, the one-way valve 2 is turned on, and the first expansion valve 31 and the second expansion valve 41 are both opened. At this time, the refrigerant has three branches in the valve body tube 1, which are the one-way valve 2, the first connecting pipe 3 and the second connecting pipe 4, thereby ensuring a larger refrigerant flow in the refrigeration mode, thereby reducing the pressure loss to ensure the refrigeration effect.

[0088] In the heating mode, the refrigerant enters the valve body tube 1 from the second interface 12, the one-way valve 2 is disconnected, and at least one of the first expansion valve 31 and the second expansion valve 41 is opened. At this time, the refrigerant has one or two branches in the valve body tube 1 and both pass through the expansion valve (that is, the first expansion valve 31 and / or the second expansion valve 41). Therefore, the throttling effect of the refrigerant in the heating mode can be guaranteed to enhance the heating effect.

[0089] It should be explained that the integrated electronic expansion valve of the present invention involves the concepts of a master valve and a slave valve, wherein the master valve is a priority-regulated expansion valve, which is opened and used in use in priority. The master valve in the present invention is not limited to the first expansion valve 31 and the second expansion valve 41, and the first expansion valve 31 and the second expansion valve 41 are used alternately as the master valve. Specifically, during the control process, the valve that is opened or opened first among the first expansion valve 31 and the second expansion valve 41 is used as the master valve and the other is used as the slave valve.

[0090] The following describes in detail the steps for controlling the integrated electronic expansion valve in the air-conditioning system when the target working mode is the heating mode.

[0091] According to some embodiments of the present invention, the target working mode is a heating mode, and the working parameters include an initial load rate of the air-conditioning system when entering the heating mode. The step of adjusting the opening of the first expansion valve 31 and the second expansion valve 41 according to the working parameters in the target working mode specifically includes:

[0092] According to the interval range of the initial load rate, determine the initial master valve opening when the master valve enters the heating mode and the initial slave valve opening when the slave valve enters the heating mode;

[0093] When entering the heating mode, the main valve is controlled to be maintained at the initial main valve opening, and the slave valve is controlled to be maintained at the initial slave valve opening.

[0094] Further, according to the interval range of the initial load rate, the step of determining the initial master valve opening when the master valve enters the heating mode and the initial slave valve opening when the slave valve enters the heating mode specifically includes:

[0095] When the initial load rate is less than or equal to the standard load rate, the initial slave valve opening is determined to be zero, the initial main valve opening is greater than zero, and the initial load rate is positively correlated with the initial main valve opening;

[0096] When the initial load rate is greater than the standard load rate, it is determined that the initial slave valve opening and the initial main valve opening are both greater than zero, and the sum of the initial main valve opening and the initial slave valve opening is positively correlated with the initial load rate.

[0097] In this embodiment, when the initial load rate is below the standard load rate, in order to increase the service life of the valve components, only the main valve is used for regulation, and the initial main valve opening is set according to different initial load rate intervals; when the initial load rate is above the standard load rate, at this time, in order to ensure the circulation of the refrigerant, the main valve and the slave valve are opened at the same time, and the initial main valve opening and the initial slave valve opening are set according to the interval range of the initial load rate.

[0098] Furthermore, when the initial load rate is greater than the standard load rate, the initial master valve opening is equal to the initial slave valve opening. It can be understood that when the master valve and the slave valve are opened at the same time, the two valves need to maintain the same opening as much as possible, thereby reducing the internal heat exchange caused by inconsistent throttling degrees.

[0099] It should be noted that the above embodiment is applicable to the situation when the air-conditioning system just enters the heating mode, that is, the above control steps can determine the initial openings of the first expansion valve 31 and the second expansion valve 41 when the air-conditioning system just enters the heating mode.

[0100] For example, taking the full opening of the first expansion valve 31 and the second expansion valve 41 as 480 pls, assuming that the load rate is marked as η, when the initial load rate is in different intervals, the initial openings of the main valve and the slave valve are selected as follows: when 0<η≤20%, the slave valve is closed, and the main valve is opened to an opening of 100 pls, that is, the initial main valve opening is 100 pls and the initial slave valve opening is 0; when 20%<η≤40%, the slave valve is closed, and the main valve is opened to an opening of 200 pls, that is, the initial main valve opening is 200 pls and the initial slave valve opening is 0; when 40%<η≤60 %, the slave valve opens to an opening of 120pls, and the main valve opens to an opening of 120pls, that is, the initial main valve opening and the initial slave valve opening are equal and both are 120pls; when 60%<η≤80%, the slave valve opens to an opening of 200pls, and the main valve opens to an opening of 200pls, that is, the initial main valve opening and the initial slave valve opening are equal and both are 200pls; when 80%<η≤100%, the slave valve opens to an opening of 250pls, and the main valve opens to an opening of 250pls, that is, the initial main valve opening and the initial slave valve opening are equal and both are 250pls

[0101] It can be understood that when the specifications of the first expansion valve 31 and the second expansion valve 41 are different from the above-mentioned expansion valve with a full opening degree of 480 pls, valve components of other specifications are adaptively regulated according to the above-mentioned ratio.

[0102] According to some embodiments of the present invention, when entering the heating mode, after the step of controlling the main valve to maintain an initial main valve opening and controlling the slave valve to maintain an initial slave valve opening, the method further includes:

[0103] When the air conditioning system is running in heating mode, the condensing superheat of the condenser is obtained once every set detection time;

[0104] The opening of the main valve is adjusted according to the range of the condensation superheat, and the opening of the slave valve is adjusted when the slave valve is open.

[0105] In this way, after the air conditioning system is in normal heating operation, the controller will adjust the opening of the first expansion valve 31 and the second expansion valve 41 according to the condensation superheat △T of the condenser. The adjustment range is related to the exhaust superheat. The two expansion valves increase or decrease according to the above adjustment range based on the current opening Pt. The system detects once every set detection time (for example, 30s). Among them, the condensation superheat refers to the difference between the condenser inlet pipe temperature Tin and the outlet pipe temperature Tout, that is, △T = Tout-Tin.

[0106] Further, the step of adjusting the opening of the main valve according to the interval range of the condensation superheat, and adjusting the opening of the slave valve when the slave valve is opened, specifically includes:

[0107] According to the condensation superheat being less than or equal to the first superheat, the main valve is controlled to reduce the first change value based on the current opening, and the slave valve is controlled to reduce the first change value based on the current opening when the slave valve is open;

[0108] According to the condensation superheat being greater than the first superheat and less than or equal to the second superheat, the main valve is controlled to reduce the second change value based on the current opening, and the slave valve is controlled to reduce the second change value based on the current opening when the slave valve is open;

[0109] If the condensing superheat is greater than the second superheat and less than or equal to the third superheat, the main valve is controlled to maintain the current opening unchanged;

[0110] According to the condensation superheat being greater than the third superheat, the main valve is controlled to increase the third change value based on the current opening, and the slave valve is controlled to increase the third change value based on the current opening when the slave valve is open.

[0111] The first change value is greater than the second change value.

[0112] For example, assuming that the condensation superheat is marked as △T, and the current openings of the first expansion valve 31 and the second expansion valve 41 are both marked as Pt, the opening adjustment process is as follows: when △T≤-1°C, the main valve opening is Pt=Pt-10, and the slave valve opening in the open state is Pt=Pt-10, that is, the main valve and the slave valve in the open state are both reduced by 10pls based on the current opening; when -1°C<△T≤2°C, the main valve opening is Pt=Pt-5, and the slave valve opening in the open state is Pt=Pt -5, that is, the main valve and the slave valve in the open state are both reduced by 5pls based on the current opening; when 2℃<△T≤5℃, the main valve opening is Pt=Pt, and the slave valve opening in the open state is Pt=Pt, that is, the main valve and the slave valve in the open state maintain the current opening unchanged; when 5℃<△T, the main valve opening is Pt=Pt+5, and the slave valve opening in the open state is Pt=Pt+5, that is, the main valve and the slave valve in the open state increase 5pls based on the current opening.

[0113] According to some embodiments of the present invention, the step of adjusting the opening of the main valve according to the interval range of the condensation superheat, and adjusting the opening of the slave valve when the slave valve is opened, specifically includes:

[0114] When the condensing superheat is less than the first superheat for three consecutive times, and the current opening of the main valve and the current opening of the slave valve are both less than the first preset opening and both greater than zero, the opening of the main valve is controlled to be adjusted to N1 times the current opening (N1>1), and the slave valve is controlled to be closed;

[0115] When the condensing superheat is greater than the third superheat for three consecutive times, the current opening of the main valve is greater than the second preset opening, and the slave valve is closed, the slave valve is controlled to open, and the openings of the main valve and the slave valve are controlled to be adjusted to N2 times the current opening (N2<1).

[0116] For example, when the condensing superheat △T is less than -1℃ for three consecutive times and the current openings of the main valve and the slave valve are less than 60pls and greater than 0, in order to make more refined refrigerant adjustments, the slave valve is closed and the main valve is adjusted to 150% of the current opening, that is, the opening of the main valve is Pt=Pt*150%, and N1=1.5 at this time.

[0117] When the condensing superheat △T is greater than 5°C for three consecutive times and the current opening of the main valve is greater than 350pls, in order to maintain the throttling effect and ensure the refrigerant flow effect, the slave valve is opened, and the openings of the main valve and the slave valve are adjusted to 60% of the current opening, that is, the openings of the main valve and the slave valve are Pt=Pt*60%, and N2=0.6 at this time.

[0118] It should be pointed out that the above embodiment is applicable to the case where the air-conditioning system is running in the heating mode, that is, the above control steps are based on the initial main valve opening and the initial slave valve opening, and the opening is adjusted according to the change of condensation superheat, so as to ensure the precise control of the refrigerant during the heating process of the air-conditioning system.

[0119] According to some other embodiments of the present invention, when entering the heating mode, after the step of controlling the main valve to maintain at the initial main valve opening and controlling the slave valve to maintain at the initial slave valve opening, the method further includes:

[0120] When the air-conditioning system operates in heating mode, obtaining load rate change information of the air-conditioning system;

[0121] According to the load rate change information, adjust the opening of the main valve and the slave valve.

[0122] It can be understood that during the operation of the air-conditioning system in the heating mode, the load rate will change due to the user's demand for heating capacity, and thus changes in parameters such as the unit load rate and condenser superheat will often occur during the operation of the unit. Therefore, in order to achieve targeted and refined refrigerant adjustment, when the unit load rate changes, the controller will further adjust the opening and closing status and opening changes of the main valve and the slave valve.

[0123] Further, the step of adjusting the opening of the main valve and the slave valve according to the load rate change information specifically includes:

[0124] When the load rate changes from above the standard load rate to below the standard load rate within the set time, the slave valve is controlled to close, and the opening of the main valve is re-determined according to the changed load rate;

[0125] When the load rate changes from below the standard load rate to above the standard load rate within the set time, the slave valve is controlled to open, and the opening of the main valve and the slave valve is re-determined according to the changed load rate.

[0126] For example, when the load rate is adjusted from more than 60% to less than 40% within 1 minute, the slave valve is closed, and the current opening of the main valve is adjusted according to the initial main valve opening corresponding to the initial load rate in the above text; when the load rate is adjusted from less than 40% to more than 60% within 1 minute, the slave valve is opened, the current opening of the main valve is adjusted according to the initial main valve opening corresponding to the initial load rate in the above text, and the current opening of the slave valve is adjusted according to the initial slave valve opening corresponding to the initial load rate in the above text.

[0127] The control device of the air-conditioning system provided by the present invention is described below. The control device of the air-conditioning system described below and the control method of the air-conditioning system described above can be referred to each other.

[0128] like Figure 3As shown, according to the fourth aspect of the present invention, a control device for an air conditioning system based on the second aspect of the present invention comprises:

[0129] An acquisition module 110 is used to acquire a target operating mode that the air-conditioning system needs to enter, and operating parameters of the air-conditioning system in the target operating mode;

[0130] The control module 120 is used to control the opening and closing of the first expansion valve 31 and / or the second expansion valve 41 according to the target working mode, and adjust the opening of the first expansion valve 31 and the second expansion valve 41 according to the working parameters in the target working mode.

[0131] Figure 4 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 4 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the control device of the air-conditioning system, including: obtaining the target working mode that the air-conditioning system needs to enter, and the working parameters of the air-conditioning system under the target working mode; controlling the opening and closing of the first expansion valve 31 and / or the second expansion valve 41 according to the target working mode, and adjusting the opening of the first expansion valve 31 and the second expansion valve 41 according to the working parameters under the target working mode.

[0132] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0133] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control device of the air-conditioning system provided by the above methods, including: obtaining the target operating mode that the air-conditioning system needs to enter, and the operating parameters of the air-conditioning system under the target operating mode; and controlling the opening and closing of the first expansion valve 31 and / or the second expansion valve 41 according to the target operating mode, and adjusting the opening of the first expansion valve 31 and the second expansion valve 41 according to the operating parameters under the target operating mode.

[0134] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the control device of the air-conditioning system provided by the above-mentioned methods, including: obtaining the target operating mode that the air-conditioning system needs to enter, and the operating parameters of the air-conditioning system under the target operating mode; and controlling the opening and closing of the first expansion valve 31 and / or the second expansion valve 41 according to the target operating mode, and adjusting the opening of the first expansion valve 31 and the second expansion valve 41 according to the operating parameters under the target operating mode.

[0135] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0136] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0137] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated electronic expansion valve, It is characterized in that include: A valve body tube, with a first interface and a second interface formed at both ends thereof, a one-way valve is arranged inside the valve body tube, and a valve direction of the one-way valve is oriented from the first interface to the second interface; A first connecting pipe and a second connecting pipe are also connected to the outer peripheral wall of the valve body pipe, the first connecting pipe, the second connecting pipe and the one-way valve are connected in parallel with each other, and the first connecting pipe is provided with a first expansion valve, and the second connecting pipe is provided with a second expansion valve; Among them, in the cooling mode of the air-conditioning system, the first interface is used for refrigerant to enter and the second interface is used for refrigerant to flow out; in the heating mode of the air-conditioning system, the second interface is used for refrigerant to flow in and the first interface is used for refrigerant to flow out.

2. An air conditioning system, It is characterized in that include: A compressor, an indoor heat exchanger, an outdoor heat exchanger and a four-way valve connected by a refrigerant pipeline; The integrated electronic expansion valve according to claim 1, wherein the first interface of the integrated electronic expansion valve is connected to the outdoor heat exchanger and the second interface is connected to the indoor heat exchanger.

3. A control method for the air conditioning system according to claim 2, It is characterized in that include: Acquiring a target operating mode that the air-conditioning system needs to enter, and operating parameters of the air-conditioning system under the target operating mode; According to the target working mode, the opening and closing of the first expansion valve and / or the second expansion valve are controlled, and the opening degrees of the first expansion valve and the second expansion valve are adjusted according to the working parameters in the target working mode.

4. The control method of the air conditioning system according to claim 3, It is characterized in that The step of determining whether the first expansion valve and / or the second expansion valve is opened or closed according to the target working mode specifically includes: Determining that the target working mode is the cooling mode, controlling both the first expansion valve and the second expansion valve to be opened; If it is determined that the target working mode is the heating mode, at least one of the first expansion valve and the second expansion valve is controlled to be opened, and the valve that is opened or opened first among the first expansion valve and the second expansion valve is used as the main valve and the other as the slave valve.

5. The control method of the air conditioning system according to claim 4, It is characterized in that The target working mode is a heating mode, and the working parameters include an initial load rate of the air-conditioning system when entering the heating mode. The step of adjusting the openings of the first expansion valve and the second expansion valve according to the working parameters in the target working mode specifically includes: Determining, according to the interval range of the initial load rate, an initial master valve opening of the master valve when entering the heating mode and an initial slave valve opening of the slave valve when entering the heating mode; When entering the heating mode, the main valve is controlled to be maintained at the initial main valve opening, and the slave valve is controlled to be maintained at the initial slave valve opening.

6. The control method of the air conditioning system according to claim 5, It is characterized in that The step of determining the initial master valve opening of the master valve when entering the heating mode and the initial slave valve opening of the slave valve when entering the heating mode according to the interval range of the initial load rate specifically includes: When the initial load rate is less than or equal to the standard load rate, the initial slave valve opening is determined to be zero, the initial main valve opening is greater than zero, and the initial load rate is positively correlated with the initial main valve opening; When the initial load rate is greater than the standard load rate, it is determined that the initial slave valve opening and the initial main valve opening are both greater than zero, and the sum of the initial main valve opening and the initial slave valve opening is positively correlated with the initial load rate.

7. The control method of the air conditioning system according to claim 6, It is characterized in that When the initial load factor is greater than the standard load factor, the initial master valve opening is equal to the initial slave valve opening.

8. The control method of the air conditioning system according to claim 5, It is characterized in that After the step of controlling the main valve to maintain at the initial main valve opening and controlling the slave valve to maintain at the initial slave valve opening when entering the heating mode, the method further includes: When the air conditioning system operates in a heating mode, the condensation superheat of the condenser is obtained once every set detection time; The opening of the main valve is adjusted according to the interval range of the condensation superheat, and the opening of the slave valve is adjusted when the slave valve is opened.

9. The control method of the air conditioning system according to claim 8, It is characterized in that The step of adjusting the opening of the main valve according to the interval range of the condensation superheat, and adjusting the opening of the slave valve when the slave valve is opened, specifically includes: According to the condensing superheat being less than or equal to the first superheat, the main valve is controlled to reduce the first change value based on the current opening, and the slave valve is controlled to reduce the first change value based on the current opening when the slave valve is opened; According to the condensing superheat being greater than the first superheat and less than or equal to the second superheat, the main valve is controlled to reduce the second change value based on the current opening, and the slave valve is controlled to reduce the second change value based on the current opening when the slave valve is open; According to the condensation superheat being greater than the second superheat and less than or equal to the third superheat, controlling the main valve to maintain the current opening unchanged; According to the condensation superheat being greater than the third superheat, the main valve is controlled to increase the third change value based on the current opening, and the slave valve is controlled to increase the third change value based on the current opening when the slave valve is opened; The first change value is greater than the second change value.

10. The control method of the air conditioning system according to claim 9, It is characterized in that The step of adjusting the opening of the main valve according to the interval range of the condensation superheat, and adjusting the opening of the slave valve when the slave valve is opened, specifically includes: When the condensing superheat is less than the first superheat for three consecutive times, and the current opening of the main valve and the current opening of the slave valve are both less than the first preset opening and both greater than zero, the opening of the main valve is controlled to be adjusted to N1 times (N1>1) of the current opening, and the slave valve is controlled to be closed; When the condensing superheat is greater than the third superheat for three consecutive times, the current opening of the main valve is greater than the second preset opening, and the slave valve is closed, the slave valve is controlled to open, and the openings of the main valve and the slave valve are controlled to be adjusted to N2 times (N2<1) of the current opening, respectively.

11. The control method of the air conditioning system according to claim 5, It is characterized in that After the step of controlling the main valve to maintain at the initial main valve opening and controlling the slave valve to maintain at the initial slave valve opening when entering the heating mode, the method further includes: When the air-conditioning system operates in the heating mode, obtaining load rate change information of the air-conditioning system; The openings of the master valve and the slave valve are adjusted according to the load factor change information.

12. The control method of the air conditioning system according to claim 11, It is characterized in that The step of adjusting the opening of the main valve and the slave valve according to the load rate change information specifically includes: When the load rate changes from above the standard load rate to below the standard load rate within a set time period, the slave valve is controlled to close, and the opening of the main valve is re-determined according to the changed load rate; When the load rate changes from below the standard load rate to above the standard load rate within a set time period, the slave valve is controlled to open, and the openings of the main valve and the slave valve are re-determined according to the changed load rate.

13. A control device for an air conditioning system according to claim 2, It is characterized in that include: An acquisition module, used for acquiring a target operating mode that the air-conditioning system needs to enter, and operating parameters of the air-conditioning system under the target operating mode; A control module is used to control the opening and closing of the first expansion valve and / or the second expansion valve according to the target working mode, and to adjust the opening of the first expansion valve and the second expansion valve according to the working parameters in the target working mode.

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