A multi-connected machine control method, device and multi-connected machine

Abstract

Embodiments of the present application provide a multi-connected air conditioner control method, device and multi-connected air conditioner, and relate to the technical field of air conditioners. The present application connects a heat exchange device including a plate heat exchanger and a water tank to a refrigerant pipeline, sets the plate heat exchanger on the refrigerant pipeline, and connects the water tank to a water inlet and a water outlet of the plate heat exchanger respectively. In the cooling mode and the heating mode, a first multi-connected air conditioner control strategy and a second multi-connected air conditioner control strategy are respectively used to control the operating state of the heat exchange device, so that high heat exchange efficiency is realized while low energy consumption is achieved, and the heat exchange function of the multi-connected air conditioner is better utilized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to a multi-split control method, device and multi-split. BACKGROUND

[0002] At present, the multi-split is applied in a wider and wider range in the air conditioner market, and is not only used for refrigeration / heat production of air conditioner, but also used for cold water heating to meet the demand of users for hot water. However, how to better utilize the heat exchange function of the multi-split to realize high heat exchange efficiency while low energy consumption is a problem to be solved at present. SUMMARY

[0003] The purposes of the present application include, for example, providing a multi-split control method, device and multi-split which can at least partially solve the above technical problems.

[0004] Embodiments of the present application can be implemented as follows:

[0005] In a first aspect, the embodiments of the present application provide a multi-split control method applied to a controller of a multi-split, wherein the multi-split further comprises a refrigerant pipeline, an oil separator, a four-way valve, an electromagnetic valve, a first electronic expansion valve and a heat exchange device, the heat exchange device comprises a plate heat exchanger and a water tank, the four-way valve is arranged on the refrigerant pipeline, and the electromagnetic valve, the plate heat exchanger and the first electronic expansion valve are sequentially connected through exhaust bypass on the refrigerant pipeline between the oil separator and the four-way valve, and the water tank is connected with a water inlet and a water outlet of the plate heat exchanger respectively; the method comprises the following steps:

[0006] obtaining an operation mode, a high-pressure saturation temperature of the multi-split and a first water temperature of the water tank, wherein the operation mode comprises a refrigeration mode and a heating mode;

[0007] if the operation mode of the multi-split is the refrigeration mode, controlling an operation state of the heat exchange device according to the first water temperature, a second water temperature of the water inlet, a third water temperature of the water outlet, a refrigerant temperature of a refrigerant outlet of the plate heat exchanger and the high-pressure saturation temperature based on the electromagnetic valve and a first multi-split control strategy;

[0008] if the operation mode of the multi-split is the heating mode, obtaining a number of current indoor units, and controlling the operation state of the heat exchange device according to the first water temperature, the number of current indoor units, the second water temperature, the third water temperature, the refrigerant temperature and the high-pressure saturation temperature based on the electromagnetic valve and a second multi-split control strategy.

[0009] Optionally, the multi-connected system further comprises a condenser and a second electronic expansion valve, which are sequentially arranged on the refrigerant pipeline after the four-way valve; based on the electromagnetic valve and the first multi-connected system control strategy, the running state of the heat exchange device is controlled according to the first water temperature, the second water temperature of the water inlet, the third water temperature of the water outlet, the refrigerant temperature of the plate heat exchanger refrigerant outlet and the high-pressure saturation temperature, including:

[0010] comparing the first water temperature and the high-pressure saturation temperature;

[0011] if the first water temperature is less than the high-pressure saturation temperature, the heat exchange device is controlled to be opened based on the electromagnetic valve, and the first electronic expansion valve and the second electronic expansion valve are controlled to be fully opened, and the running state of the plate heat exchanger is controlled according to the second water temperature, the third water temperature and the refrigerant temperature;

[0012] if the first water temperature is greater than or equal to the high-pressure saturation temperature, the heat exchange device is controlled to be closed based on the electromagnetic valve.

[0013] Optionally, the running state of the plate heat exchanger is controlled according to the second water temperature, the third water temperature and the refrigerant temperature, including:

[0014] if the third water temperature is less than the refrigerant temperature, the electromagnetic valve is controlled to be always opened, and the temperature difference between the second water temperature and the third water temperature is determined to be in a temperature range, and the water pump gear of the plate heat exchanger is controlled according to the temperature range;

[0015] if the third water temperature is greater than or equal to the refrigerant temperature, the opening and closing of the electromagnetic valve is controlled according to the size relationship between the second water temperature and the refrigerant temperature, and the running state of the plate heat exchanger is further controlled.

[0016] Optionally, the water pump gear of the plate heat exchanger is controlled according to the temperature range, including:

[0017] if the temperature difference is in a first temperature range, the water pump is controlled to run at a first gear;

[0018] if the temperature difference is in a second temperature range, the water pump is controlled to run at a second gear;

[0019] if the temperature difference is between the first temperature range and the second temperature range, it is determined whether the temperature difference is between the first temperature range and the second temperature range for the first time, if yes, the water pump is controlled to run at a second gear; if not, the running state of the water pump is maintained;

[0020] The temperature of the first temperature range is greater than the temperature of the second temperature range, and the power of the first gear is greater than the power of the second gear.

[0021] Optionally, the opening and closing of the electromagnetic valve according to the size relationship between the second water temperature and the refrigerant temperature, and the running state of the plate heat exchanger are controlled, comprising:

[0022] If the second water temperature is less than the refrigerant temperature, the electromagnetic valve is controlled to be opened, and the plate heat exchanger is kept in a running state;

[0023] If the second water temperature is greater than or equal to the refrigerant temperature, the electromagnetic valve is controlled to be closed.

[0024] Optionally, the running state of the heat exchange device is controlled according to the first water temperature, the number of on machines, the second water temperature, the third water temperature, the refrigerant temperature and the high-pressure saturation temperature based on the electromagnetic valve and the second multi-machine control strategy, comprising:

[0025] The proportional relationship between the number of on machines and the total number of indoor machines is determined;

[0026] If the number of on machines is less than half of the total number of indoor machines, the running state of the heat exchange device is controlled according to the size relationship between the first water temperature and the high-pressure saturation temperature;

[0027] If there is no indoor machine running, the temperature range of the temperature difference between the second water temperature and the third water temperature is determined, and the water pump gear of the plate heat exchanger is controlled according to the temperature range;

[0028] If the number of on machines is half or more of the total number of indoor machines, the heat exchange device is controlled to be closed.

[0029] Optionally, the running state of the heat exchange device is controlled according to the size relationship between the first water temperature and the high-pressure saturation temperature, comprising:

[0030] If the first water temperature is less than the high-pressure saturation temperature, the heat exchange device is controlled to be opened, and the refrigerant flow through the heat exchange device is controlled according to the difference between the first water temperature and the refrigerant temperature;

[0031] If the first water temperature is greater than or equal to the high-pressure saturation temperature, the heat exchange device is controlled to be closed.

[0032] Optionally, the water pump gear of the plate heat exchanger is controlled according to the temperature range, comprising:

[0033] If the temperature difference is in a third temperature range, the water pump is controlled to run at a third gear;

[0034] if the temperature difference is in a fourth temperature range, controlling the water pump to run in a fourth gear;

[0035] if the temperature difference is between the third temperature range and the fourth temperature range, determining whether the temperature difference is in the third temperature range and the fourth temperature range for the first time, if yes, controlling the water pump to run in a fourth gear, and if no, keeping the previous running state of the water pump;

[0036] wherein a temperature of the third temperature range is greater than a temperature of the fourth temperature range, and a power of the third gear is greater than a power of the fourth gear.

[0037] In a second aspect, an embodiment of the present application provides a multi-split air conditioner control device, applied to a controller of a multi-split air conditioner, the multi-split air conditioner further comprising a refrigerant pipeline, an oil separator, a four-way valve, an electromagnetic valve, a first electronic expansion valve, and a heat exchange device, the heat exchange device comprising a plate heat exchanger and a water tank, the four-way valve being arranged on the refrigerant pipeline, and the electromagnetic valve, the plate heat exchanger, and the first electronic expansion valve being sequentially connected by an exhaust bypass on the refrigerant pipeline between the oil separator and the four-way valve, and the water tank being connected with a water inlet and a water outlet of the plate heat exchanger respectively; the multi-split air conditioner control device comprising:

[0038] a data acquisition unit, configured to acquire an operation mode, a high-pressure saturation temperature, and a first water temperature of the water tank of the multi-split air conditioner, the operation mode comprising a cooling mode and a heating mode;

[0039] a first control unit, if the operation mode of the multi-split air conditioner is the cooling mode, based on the electromagnetic valve and a first multi-split air conditioner control strategy, controlling a running state of the heat exchange device according to the first water temperature, a second water temperature of the water inlet, a third water temperature of the water outlet, a refrigerant temperature of a refrigerant outlet of the plate heat exchanger, and the high-pressure saturation temperature;

[0040] a second control unit, if the operation mode of the multi-split air conditioner is the heating mode, acquiring a number of currently started indoor units, and based on the electromagnetic valve and a second multi-split air conditioner control strategy, controlling the running state of the heat exchange device according to the first water temperature, the number of started indoor units, the second water temperature, the third water temperature, the refrigerant temperature, and the high-pressure saturation temperature.

[0041] In a third aspect, an embodiment of the present application provides a multi-split air conditioner, which realizes the steps of any one of the above methods when running.

[0042] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, which comprises a computer program, and the computer program controls a server where the computer readable storage medium is located to implement steps of the method according to any one of the preceding aspects when the computer program is executed.

[0043] The beneficial effects of the embodiments of the present application include, for example:

[0044] By connecting a heat exchange device comprising a plate heat exchanger and a water tank to the refrigerant pipeline, the plate heat exchanger is arranged on the refrigerant pipeline, and the water tank is connected to the water inlet and the water outlet of the plate heat exchanger, respectively. In the refrigeration mode and the heating mode, the first multi-split control strategy and the second multi-split control strategy are used to control the operating state of the heat exchange device, so as to realize high heat exchange efficiency while realizing low energy consumption, and better utilize the heat exchange function of the multi-split. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0046] Figure 1 A step flow chart of a multi-split control method provided by an embodiment of the present application is provided.

[0047] Figure 2 A system refrigeration cycle schematic diagram of a multi-split provided by an embodiment of the present application is provided.

[0048] Figure 3 A system heating cycle schematic diagram of a multi-split provided by an embodiment of the present application is provided.

[0049] Figure 4 An architecture diagram of a multi-split control device provided by an embodiment of the present application is provided.

[0050] Figure legend: 300-multi-split control device; 301-data acquisition unit; 302-first control unit; 303-second control unit. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0052] The following detailed description of the embodiments of the application in the accompanying drawings provides merely by way of exemplifications of the application. Therefore, no limitation of the scope of the application is intended to be presented by way of the embodiments of the application. Based on the embodiments of the application, all other embodiments obtained by a person skilled in the art without creative work fall into the scope of protection of the application.

[0053] It should be noted that similar reference numerals and letters refer to like items in the following drawings, and thus once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings.

[0054] In addition, the terms "first", "second" and the like are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0055] It should be noted that the features in the embodiments of the application can be combined with each other without conflict.

[0056] As shown in Figure 1 The embodiment of the application provides a multi-split control method, which is applied to a controller of a multi-split, and the multi-split further comprises a refrigerant pipeline, an oil separator, a four-way valve, an electromagnetic valve, a first electronic expansion valve and a heat exchange device, the heat exchange device comprises a plate heat exchanger and a water tank, the four-way valve is arranged on the refrigerant pipeline, the electromagnetic valve, the plate heat exchanger and the first electronic expansion valve are sequentially connected through exhaust bypass on the refrigerant pipeline between the oil separator and the four-way valve, and the water tank is connected with a water inlet and a water outlet of the plate heat exchanger respectively. The method comprises the following steps.

[0057] Step S110: Obtain an operation mode, a high-pressure saturation temperature and a first water temperature of the water tank of the multi-split, and the operation mode comprises a refrigeration mode and a heating mode.

[0058] Step S120: If the operation mode of the multi-split is the refrigeration mode, the running state of the heat exchange device is controlled according to the first water temperature, a second water temperature of the water inlet, a third water temperature of the water outlet, a refrigerant temperature of a refrigerant outlet of the plate heat exchanger and the high-pressure saturation temperature based on the electromagnetic valve and a first multi-split control strategy.

[0059] Step S130: If the operation mode of the multi-split is the heating mode, obtain the number of current indoor units, and control the running state of the heat exchange device according to the first water temperature, the number of the current indoor units, the second water temperature, the third water temperature, the refrigerant temperature and the high-pressure saturation temperature based on the electromagnetic valve and a second multi-split control strategy.

[0060] Figure 1This is a system circulation diagram for a multi-split system in cooling mode. Figure 2 This is a system circulation diagram for a multi-split system in heating mode. (Example:) Figure 1 As shown, the refrigerant is compressed by the compressor, transforming the originally low-temperature, low-pressure refrigerant into high-temperature, high-pressure superheated vapor, which is then discharged from the compressor's exhaust port. After being discharged from the compressor's exhaust port, the high-temperature, high-pressure gaseous refrigerant passes through an oil separator and is then sent into the condenser via a four-way valve. Inside the condenser, the axial fan cools the refrigerant, and the cooled refrigerant in the condenser piping is then discharged as a medium-temperature, high-pressure liquid refrigerant. This medium-temperature, high-pressure liquid refrigerant, after being discharged from the condenser, passes through a one-way valve, a dryer filter, and then the electronic expansion valve PMV0 (i.e., the second electronic expansion valve) for throttling and pressure reduction, becoming a low-temperature, low-pressure liquid refrigerant, which is then distributed into the piping of each indoor unit. When the heat exchange device is connected and turned on, the refrigerant separated from the oil enters the condenser through the four-way valve, and at the same time, a portion of it enters the plate heat exchanger through the solenoid valve SV0. After flowing out of the plate heat exchanger, it merges with the refrigerant flowing out of the condenser through the electronic expansion valve PMV1 (i.e., the first electronic expansion valve) and the refrigerant that has been throttled and depressurized by the electronic expansion valve PMV0.

[0061] Figure 2 The heating principle shown is the same as Figure 1 The refrigeration principle shown is the same, except that the four-way valve has been reversed. By changing the direction of the refrigerant flow, the conversion from refrigeration to heating is achieved.

[0062] In step S110, the operating mode, high-pressure saturation temperature, and first water temperature of the water tank of the multi-split unit are obtained. The operating mode includes a cooling mode and a heating mode.

[0063] Since different data are required to control the heat exchanger of a multi-split air conditioner under different operating modes, it is necessary to obtain the current operating mode of the multi-split air conditioner before controlling the heat exchanger. Regardless of whether it is cooling mode or heating mode, it is necessary to obtain the high-pressure saturation temperature of the system and the water temperature of the heat exchanger tank (i.e., the first water temperature). Therefore, the high-pressure saturation temperature and the first water temperature can be obtained at the same time as obtaining the operating mode of the multi-split air conditioner.

[0064] Execute step S120: If the operating mode of the multi-split unit is the cooling mode, then based on the solenoid valve and the first multi-split unit control strategy, the operating status of the heat exchange device is controlled according to the first water temperature, the second water temperature at the inlet, the third water temperature at the outlet, the refrigerant temperature at the refrigerant outlet of the plate heat exchanger, and the high-pressure saturation temperature.

[0065] When the multi-split air conditioner is in a cooling mode, a first water temperature of a water tank, a second water temperature of a water inlet of a plate heat exchanger, a third water temperature of a water outlet of the plate heat exchanger, a refrigerant temperature of a refrigerant outlet of the plate heat exchanger, and a high-pressure saturation temperature can be obtained, and a running state of the heat exchange device is controlled based on a first multi-split air conditioner control strategy. The refrigerant temperature can be the refrigerant temperature of the refrigerant flowing out of the plate heat exchanger outlet after passing through the plate heat exchanger. The temperature obtaining method can be achieved by arranging temperature sensors in communication connection with the multi-split air conditioner controller at positions such as the water tank, the plate heat exchanger water inlet, the plate heat exchanger water outlet, and the plate heat exchanger refrigerant outlet. The control of the running state of the heat exchange device can be achieved by controlling the opening and closing of the electromagnetic valve.

[0066] The first multi-split air conditioner control strategy can be various, for example, the opening and closing of the heat exchange device is controlled according to whether the temperature of the first water temperature, the second water temperature, and the third water temperature meets the respective set threshold value; for example, the opening and closing of the heat exchange device is controlled by comparing the first water temperature, the second water temperature, and the third water temperature; for example, the running intensity of the heat exchange device is controlled by comparing the high-pressure saturation temperature and the refrigerant temperature, and the like.

[0067] Optionally, the multi-split air conditioner further comprises a condenser and a second electronic expansion valve, which are sequentially arranged on the refrigerant pipeline after the four-way valve. The control of the running state of the heat exchange device based on the electromagnetic valve and the first multi-split air conditioner control strategy according to the first water temperature, the second water temperature of the water inlet, the third water temperature of the water outlet, the refrigerant temperature of the plate heat exchanger refrigerant outlet, and the high-pressure saturation temperature comprises:

[0068] Comparing the size relationship between the first water temperature and the high-pressure saturation temperature.

[0069] If the first water temperature is less than the high-pressure saturation temperature, the heat exchange device is controlled to be opened based on the electromagnetic valve, and the first electronic expansion valve and the second electronic expansion valve are controlled to be fully opened, and the running state of the plate heat exchanger is controlled according to the second water temperature, the third water temperature, and the refrigerant temperature.

[0070] If the first water temperature is greater than or equal to the high-pressure saturation temperature, the heat exchange device is controlled to be closed based on the electromagnetic valve.

[0071] As an optional embodiment, the start and stop of the heat exchange device can be controlled by comparing the size relationship between the first water temperature and the high-pressure saturation temperature. When the first water temperature is less than the high-pressure saturation temperature, the heat exchange device is controlled to be opened; when the first water temperature is greater than or equal to the high-pressure saturation temperature, the heat exchange device is controlled to be closed.

[0072] Since the outdoor unit expansion valve is generally kept fully open during refrigeration operation, throttling control is mainly in the indoor unit expansion valve. Therefore, when the heat exchange device is started, the refrigerant flow through the heat exchange device and the condenser of the multi-split air conditioner is kept consistent, i.e., the PMV0 is consistent with the PMV1. Figure 2 In addition, the operation state of the plate heat exchanger can also be controlled by the second water temperature, the third water temperature, and the refrigerant temperature, such as controlling the opening / closing of the plate heat exchanger and the operation speed (i.e., the water pump speed) of the plate heat exchanger according to the size relationship between the second water temperature and the third water temperature and whether the refrigerant temperature reaches a set value.

[0073] Optionally, the control of the operation state of the plate heat exchanger according to the second water temperature, the third water temperature, and the refrigerant temperature comprises:

[0074] If the third water temperature is less than the refrigerant temperature, the electromagnetic valve is controlled to be always open, and the temperature range of the temperature difference between the second water temperature and the third water temperature is determined, and the water pump gear of the plate heat exchanger is controlled according to the temperature range.

[0075] If the third water temperature is greater than or equal to the refrigerant temperature, the opening / closing of the electromagnetic valve is controlled according to the size relationship between the second water temperature and the refrigerant temperature, and the operation state of the plate heat exchanger is further controlled.

[0076] The way of controlling the operation state of the plate heat exchanger by the second water temperature, the third water temperature, and the refrigerant temperature can be determining whether the third water temperature is less than the refrigerant temperature, if yes, then determining the temperature range of the temperature difference between the second water temperature and the third water temperature (the temperature range can be a preset range), and then controlling the water pump gear of the plate heat exchanger according to the temperature range. If the third water temperature is greater than or equal to the refrigerant temperature, then determining the size relationship between the second water temperature and the refrigerant temperature, and controlling the plate heat exchanger according to the comparison result.

[0077] For example, if the third water temperature is 30℃, the second water temperature is 27℃, and the refrigerant temperature is 32℃, then it is determined which preset temperature range the 3℃ belongs to, and the water pump gear of the plate heat exchanger is controlled according to the control strategy of the temperature range. If the third water temperature is 30℃, the second water temperature is 27℃, and the refrigerant temperature is 29℃, then the plate heat exchanger is controlled according to the control strategy when the third water temperature is greater than the second water temperature.

[0078] Optionally, the control of the water pump gear of the plate heat exchanger according to the temperature range comprises:

[0079] If the temperature difference is in a first temperature range, the water pump is controlled to operate at a first gear.

[0080] If the temperature difference is in a second temperature range, the water pump is controlled to run in a second gear.

[0081] If the temperature difference is between the first temperature range and the second temperature range, it is determined whether the temperature difference is first between the first temperature range and the second temperature range, if yes, the water pump is controlled to run in a second gear; if no, the previous running state of the water pump is maintained.

[0082] The temperature of the first temperature range is greater than the temperature of the second temperature range, and the power of the first gear is greater than the power of the second gear.

[0083] As an optional embodiment, when it is determined that the third water temperature is less than the refrigerant temperature, two preset temperature ranges, i.e., a first temperature range and a second temperature range, can be set. When the temperature difference between the second water temperature and the third water temperature is in the first temperature range, the water pump of the plate heat exchanger is controlled to run in a high gear (i.e., a first gear); when the temperature difference between the second water temperature and the third water temperature is in the second temperature range, the water pump of the plate heat exchanger is controlled to run in a low gear (i.e., a second gear).

[0084] For example, if the first temperature range is [5, 10 ℃) and the second temperature range is (-∞, 5 ℃), when the second water temperature is 35 ℃ and the third water temperature is 30 ℃ and less than the refrigerant temperature, it is determined that the temperature difference is in the first temperature range, and the water pump is controlled to run in the first gear.

[0085] If there is a temperature interval between the first temperature range and the second temperature range, for example, the first temperature range is [8, 10 ℃) and the second temperature range is (3, 5 ℃), a temperature interval [5, 8 ℃) is included. When the temperature difference is in this temperature interval, if it is determined that it is first entering the temperature interval, the water pump is adjusted to run in a low gear; if it is determined that it is not first entering the temperature interval, the previous gear of the water pump is maintained.

[0086] Optionally, the control of the opening and closing of the electromagnetic valve according to the size relationship between the second water temperature and the refrigerant temperature, thereby controlling the running state of the plate heat exchanger, comprises:

[0087] If the second water temperature is less than the refrigerant temperature, the electromagnetic valve is controlled to be opened, so that the plate heat exchanger is maintained in a running state.

[0088] If the second water temperature is greater than or equal to the refrigerant temperature, the electromagnetic valve is controlled to be closed.

[0089] When the third water temperature is greater than or equal to the refrigerant temperature, the second water temperature and the refrigerant temperature are continuously compared. If the second water temperature is less than the refrigerant temperature, the electromagnetic valve is controlled to be opened, so that the plate heat exchanger is kept in an open state. The outdoor heat exchanger is increased to improve the heat exchange efficiency and reduce the energy consumption. At the same time, the water temperature is increased to meet the hot water demand of the user. If the second water temperature is greater than or equal to the refrigerant temperature, the electromagnetic valve is controlled to be closed, so that the plate heat exchanger is closed. Only the outdoor heat exchanger is used for heat exchange, so as to avoid high water temperature and affect the heat exchange efficiency of the outdoor unit.

[0090] In step S130, if the operation mode of the multi-split air conditioner is the heating mode, the number of turned-on indoor units is obtained. Based on the electromagnetic valve and the second multi-split air conditioner control strategy, the operation state of the heat exchange device is controlled according to the first water temperature, the number of turned-on indoor units, the second water temperature, the third water temperature, the refrigerant temperature and the high-pressure saturation temperature.

[0091] The number of turned-on indoor units is the number of turned-on indoor units in the current operation state of the multi-split air conditioner. When the multi-split air conditioner is in the heating mode, the first water temperature, the second water temperature, the third water temperature, the refrigerant temperature, the high-pressure saturation temperature and the number of turned-on indoor units of the water tank can be obtained. The operation state of the heat exchange device is controlled based on the second multi-split air conditioner control strategy. Similarly, the refrigerant temperature can be the refrigerant temperature when the refrigerant flows out of the plate heat exchanger outlet after passing through the plate heat exchanger. The way to obtain various temperatures can also be to set temperature sensors in communication connection with the multi-split air conditioner controller at positions such as the water tank, the plate heat exchanger inlet, the plate heat exchanger outlet and the plate heat exchanger refrigerant outlet.

[0092] Similarly to the first multi-split air conditioner control strategy, the second multi-split air conditioner control strategy can also be various, for example, the number of turned-on indoor units is used to control the opening and closing of the heat exchange device; for example, the first water temperature, the second water temperature and the third water temperature are compared to control the opening and closing of the heat exchange device; for example, the high-pressure saturation temperature and the refrigerant temperature are compared to control the operation intensity of the heat exchange device, and the like.

[0093] Optionally, the operation state of the heat exchange device is controlled according to the first water temperature, the number of turned-on indoor units, the second water temperature, the third water temperature, the refrigerant temperature and the high-pressure saturation temperature based on the second multi-split air conditioner control strategy, and the operation state of the heat exchange device is controlled according to the first water temperature, the number of turned-on indoor units, the second water temperature, the third water temperature, the refrigerant temperature and the high-pressure saturation temperature based on the second multi-split air conditioner control strategy.

[0094] The proportion relationship between the number of turned-on indoor units and the total number of indoor units is determined.

[0095] If the number of turned-on indoor units is less than half of the total number of indoor units, the operation state of the heat exchange device is controlled according to the size relationship between the first water temperature and the high-pressure saturation temperature.

[0096] If the number of the running indoor units is less than half of the total number of the indoor units, the temperature difference between the second water temperature and the third water temperature is determined, and the water pump gear of the plate heat exchanger is controlled according to the temperature range.

[0097] If the number of the running indoor units is half of the total number of the indoor units or more, the heat exchange device is controlled to be closed.

[0098] The controller can obtain the number of the running indoor units through the signal transmitted by the signal line, and then determine the proportion of the number of the running indoor units to the total number of the indoor units. When the number of the running indoor units is greater than or equal to 50% of the total number of the indoor units, the heat exchange device is not started, and is kept in a closed state, so that the multi-split air conditioner is only used for heating. When there is no indoor unit running, the multi-split air conditioner is only used for hot water heating, and the water pump gear of the plate heat exchanger can be controlled according to the temperature range of the temperature difference between the second water temperature and the third water temperature. When the number of the running indoor units is less than 50% of the total number of the indoor units, the running state of the heat exchange device is controlled according to the size relationship between the first water temperature and the high-pressure saturation temperature.

[0099] Optionally, the control of the running state of the heat exchange device according to the size relationship between the first water temperature and the high-pressure saturation temperature comprises:

[0100] If the first water temperature is less than the high-pressure saturation temperature, the heat exchange device is controlled to be started, and the refrigerant flow through the heat exchange device is controlled according to the difference between the first water temperature and the refrigerant temperature.

[0101] If the first water temperature is greater than or equal to the high-pressure saturation temperature, the heat exchange device is controlled to be closed.

[0102] As an optional embodiment, when the number of the running indoor units is less than 50% of the total number of the indoor units, if the first water temperature is greater than or equal to the high-pressure saturation temperature, the heat exchange device is controlled to be closed (or kept in a closed state without being started). If the first water temperature is less than the high-pressure saturation temperature, the heat exchange device is controlled to be started, and the refrigerant flow through the heat exchange device is controlled according to the difference between the first water temperature and the refrigerant temperature. The control of the refrigerant flow through the heat exchange device according to the difference between the first water temperature and the refrigerant temperature can be the control according to the size relationship between the first water temperature and the high-pressure saturation temperature.

[0103] Since the heat exchange device is equivalent to an indoor unit during heating operation, the expansion valve controls the refrigerant circulation amount through supercooling degree adjustment, which can ensure optimal heat exchange and avoid liquid accumulation in the heat exchange device, thereby affecting the refrigerant circulation amount. Therefore, if the first water temperature is less than the high-pressure saturation temperature, the plate heat exchanger can be started, and the PMV1 opening degree is controlled according to the supercooling degree (the difference between the first water temperature and the refrigerant temperature). If the first water temperature is greater than or equal to the high-pressure saturation temperature, the heat exchange device can be closed, so that the multi-split air conditioner is only used for heating. Figure 3 The PMV1 opening degree. If the first water temperature is greater than or equal to the high-pressure saturation temperature, the heat exchange device can be closed, so that the multi-split air conditioner is only used for heating.

[0104] Optionally, the water pump gear of the plate heat exchanger is controlled according to the temperature range, comprising:

[0105] If the temperature difference value is in a third temperature range, the water pump is controlled to run at a third gear.

[0106] If the temperature difference value is in a fourth temperature range, the water pump is controlled to run at a fourth gear.

[0107] If the temperature difference value is between the third temperature range and the fourth temperature range, it is determined whether the temperature difference value is in the third temperature range and the fourth temperature range for the first time. If yes, the water pump is controlled to run at a fourth gear; if no, the running state of the water pump is maintained.

[0108] The temperature of the third temperature range is greater than the temperature of the fourth temperature range, and the power of the third gear is greater than the power of the fourth gear.

[0109] Similarly to the control mode in the refrigeration mode, when it is determined that the third water temperature is less than the refrigerant temperature, two preset temperature ranges, a third temperature range and a fourth temperature range, can also be set. When the temperature difference value between the second water temperature and the third water temperature is in the third temperature range, the water pump of the plate heat exchanger is controlled to run at a high gear (i.e. the third gear); when the temperature difference value between the second water temperature and the third water temperature is in the fourth temperature range, the water pump of the plate heat exchanger is controlled to run at a low gear (i.e. the fourth gear). Similarly, the temperature of the third temperature range is greater than the temperature of the fourth temperature range, and the power of the third gear is greater than the power of the fourth gear.

[0110] If there is a temperature interval between the third temperature range and the fourth temperature range, for example, the third temperature range is [10, 12℃), and the fourth temperature range is (2, 4℃), a temperature interval [4, 10℃) is also included. When the temperature difference value is in this temperature interval, if it is determined that it is the first time to enter the temperature interval, the water pump is adjusted to run at a low gear; if it is determined that it is not the first time to enter the temperature interval, the gear of the water pump before is maintained.

[0111] It should be noted that when the developer sets the gears and temperature ranges, the first gear and the third gear can be set to the same power, and the second gear and the fourth gear can be set to the same power; or the first temperature range and the third temperature range can be set to the same temperature range, and the second temperature range and the fourth temperature range can be set to the same temperature range. The present specification does not make specific limitations on this.

[0112] Based on the same inventive concept, as Figure 4As shown, the embodiment of the present application provides a multi-split control device 300, which is applied to a controller of a multi-split, the multi-split further comprises a refrigerant pipeline, an oil separator, a four-way valve, a solenoid valve, a first electronic expansion valve and a heat exchange device, the heat exchange device comprises a plate heat exchanger and a water tank, the four-way valve is arranged on the refrigerant pipeline, the refrigerant pipeline between the oil separator and the four-way valve is sequentially connected with the solenoid valve, the plate heat exchanger and the first electronic expansion valve through an exhaust bypass, and the water tank is connected with a water inlet and a water outlet of the plate heat exchanger respectively. The multi-split control device 300 comprises:

[0113] a data acquisition unit 301, configured to acquire an operation mode, a high-pressure saturation temperature and a first water temperature of a water tank of the multi-split, the operation mode comprising a cooling mode and a heating mode.

[0114] a first control unit 302, if the operation mode of the multi-split is the cooling mode, the first control unit 302 is configured to control an operation state of the heat exchange device according to the first water temperature, a second water temperature of the water inlet, a third water temperature of the water outlet, a refrigerant temperature of a refrigerant outlet of the plate heat exchanger and the high-pressure saturation temperature based on the solenoid valve and a first multi-split control strategy.

[0115] a second control unit 303, if the operation mode of the multi-split is the heating mode, the second control unit 303 is configured to acquire a number of currently started indoor units and control the operation state of the heat exchange device according to the first water temperature, the number of the currently started indoor units, the second water temperature, the third water temperature, the refrigerant temperature and the high-pressure saturation temperature based on the solenoid valve and a second multi-split control strategy.

[0116] As to the above multi-split control device 300, the specific functions of each unit have been described in detail in the embodiment of the multi-split control method provided in the present application, and will not be described in detail here.

[0117] Based on the same inventive concept, the embodiment of the present application provides a computer readable storage medium, which stores a computer program, the program is executed by a processor to realize the steps of any method of the above multi-split control method.

[0118] The present application at least has the following advantages:

[0119] 1. By connecting a heat exchange device comprising a plate heat exchanger and a water tank to the refrigerant pipeline, the plate heat exchanger is arranged on the refrigerant pipeline, and the water tank is connected with a water inlet and a water outlet of the plate heat exchanger respectively. In the cooling mode and the heating mode, the first multi-split control strategy and the second multi-split control strategy are respectively adopted to control the operation state of the heat exchange device, so that high heat exchange efficiency is realized while low energy consumption is realized, and the heat exchange function of the multi-split is better utilized.

[0120] 2. The heat exchange device is connected, the heat exchange capacity of the outdoor unit of the multi-connected air conditioner is improved, and the heat dissipation of the outdoor unit is effectively utilized for heating hot water.

[0121] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can also be implemented by other manners. The device embodiments described above are only illustrative, for example, the flowcharts and block diagrams in the drawings show the possible implementation architecture, functions and operations of the devices, methods and computer program products according to the embodiments of the present application. In this regard, each block in the flowchart or block diagram can represent a module, a program segment or a part of code, which includes one or more executable instructions for implementing the specified logic function. It should also be noted that in some alternative implementation manners, the functions marked in the blocks can also occur in different order from that marked in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for executing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0122] In addition, the functional modules in the various embodiments of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0123] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the part of the present application that essentially contributes to the prior art or the part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0124] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A multi-split control method, characterized in that, The application relates to a controller applied to a multi-connected machine, wherein the multi-connected machine further comprises a refrigerant pipeline, oil separation, a four-way valve, an electromagnetic valve, a first electronic expansion valve and a heat exchange device; the heat exchange device comprises a plate heat exchanger, a water tank, a condenser and a second electronic expansion valve; the condenser and the second electronic expansion valve are sequentially arranged on the refrigerant pipeline after the four-way valve; the four-way valve is arranged on the refrigerant pipeline; the electromagnetic valve, the plate heat exchanger and the first electronic expansion valve are sequentially connected through exhaust bypass on the refrigerant pipeline between the oil separation and the four-way valve; the water tank is connected with the water inlet and the water outlet of the plate heat exchanger; the method comprises the following steps: obtaining the operation mode, the high-pressure saturation temperature and the first water temperature of the water tank of the multi-connected machine; the operation mode comprises a refrigeration mode and a heating mode; if the operation mode of the multi-connected machine is the refrigeration mode, then the running state of the heat exchange device is controlled according to the first water temperature, the second water temperature of the water inlet, the third water temperature of the water outlet, the refrigerant temperature of the plate heat exchanger and the high-pressure saturation temperature based on the electromagnetic valve and the first multi-connected machine control strategy, which comprises the following steps: comparing the size relationship between the first water temperature and the high-pressure saturation temperature; if the first water temperature is smaller than the high-pressure saturation temperature, then the heat exchange device is controlled to be opened based on the electromagnetic valve, the first electronic expansion valve and the second electronic expansion valve are controlled to be fully opened, and the running state of the plate heat exchanger is controlled according to the second water temperature, the third water temperature and the refrigerant temperature; if the first water temperature is greater than or equal to the high-pressure saturation temperature, then the heat exchange device is controlled to be closed based on the electromagnetic valve; if the operation mode of the multi-connected machine is the heating mode, then the number of the current indoor units is obtained, and the running state of the heat exchange device is controlled according to the first water temperature, the number of the current indoor units, the second water temperature, the third water temperature, the refrigerant temperature and the high-pressure saturation temperature based on the electromagnetic valve and the second multi-connected machine control strategy, which comprises the following steps: judging the proportional relationship between the number of the current indoor units and the total number of the indoor units; if the number of the current indoor units is smaller than half of the total number of the indoor units, then the running state of the heat exchange device is controlled according to the size relationship between the first water temperature and the high-pressure saturation temperature; if no indoor unit is in operation, then the temperature range of the temperature difference between the second water temperature and the third water temperature is judged, and the water pump gear position of the plate heat exchanger is controlled according to the temperature range; if the number of the current indoor units is half of the total number of the indoor units or more, then the heat exchange device is controlled to be closed.

2. The in-line control method of claim 1, wherein, the control of the running state of the plate heat exchanger according to the second water temperature, the third water temperature and the refrigerant temperature comprises the following steps: if the third water temperature is smaller than the refrigerant temperature, then the electromagnetic valve is controlled to be always opened, the temperature range of the temperature difference between the second water temperature and the third water temperature is judged, and the water pump gear position of the plate heat exchanger is controlled according to the temperature range; If the third water temperature is greater than or equal to the refrigerant temperature, the opening and closing of the electromagnetic valve is controlled according to the magnitude relationship between the second water temperature and the refrigerant temperature, and the operating state of the plate heat exchanger is further controlled.

3. The in-line control method of claim 2, wherein, The water pump gear position of the plate heat exchanger is controlled according to the temperature range, including: If the temperature difference is in a first temperature range, the water pump is controlled to operate at a first gear; If the temperature difference is in a second temperature range, the water pump is controlled to operate at a second gear; If the temperature difference is between the first temperature range and the second temperature range, it is determined whether the temperature difference is in the first temperature range and the second temperature range for the first time, if yes, the water pump is controlled to operate at a second gear; if not, the previous operating state of the water pump is maintained; The temperature of the first temperature range is greater than the temperature of the second temperature range, and the power of the first gear is greater than the power of the second gear.

4. The in-line control method of claim 2, wherein, The opening and closing of the electromagnetic valve is controlled according to the magnitude relationship between the second water temperature and the refrigerant temperature, and the operating state of the plate heat exchanger is further controlled, including: If the second water temperature is less than the refrigerant temperature, the electromagnetic valve is controlled to open, and the plate heat exchanger is maintained in an operating state; If the second water temperature is greater than or equal to the refrigerant temperature, the electromagnetic valve is controlled to close.

5. The in-line control method of claim 1, wherein, The operating state of the heat exchange device is controlled according to the magnitude relationship between the first water temperature and the high-pressure saturation temperature, including: If the first water temperature is less than the high-pressure saturation temperature, the heat exchange device is controlled to open, and the refrigerant flow through the heat exchange device is controlled according to the difference between the first water temperature and the refrigerant temperature; If the first water temperature is greater than or equal to the high-pressure saturation temperature, the heat exchange device is controlled to close.

6. The in-line control method of claim 1, wherein, The water pump gear position of the plate heat exchanger is controlled according to the temperature range, including: If the temperature difference is in a third temperature range, the water pump is controlled to operate at a third gear; If the temperature difference is in a fourth temperature range, the water pump is controlled to operate at a fourth gear; If the temperature difference is between the third temperature range and the fourth temperature range, it is determined whether the temperature difference is in the third temperature range and the fourth temperature range for the first time, if yes, the water pump is controlled to operate at a fourth gear; if not, the previous operating state of the water pump is maintained; The temperature of the third temperature range is greater than the temperature of the fourth temperature range, and the power of the third gear is greater than the power of the fourth gear.

7. A multi-split control device, characterized in that, The application relates to a controller applied to a multi-connected unit, wherein the multi-connected unit further comprises a refrigerant pipeline, an oil separator, a four-way valve, an electromagnetic valve, a first electronic expansion valve and a heat exchange device, the heat exchange device comprises a plate heat exchanger, a water tank, a condenser and a second electronic expansion valve, the condenser and the second electronic expansion valve are sequentially arranged on the refrigerant pipeline behind the four-way valve, the four-way valve is arranged on the refrigerant pipeline, the electromagnetic valve, the plate heat exchanger and the first electronic expansion valve are sequentially connected through exhaust bypass on the refrigerant pipeline between the oil separator and the four-way valve, and the water tank is connected with a water inlet and a water outlet of the plate heat exchanger respectively; the multi-connected unit control device comprises: a data acquisition unit for acquiring an operation mode, a high-pressure saturation temperature and a first water temperature of the water tank of the multi-connected unit, wherein the operation mode comprises a refrigeration mode and a heating mode; a first control unit, if the operation mode of the multi-connected unit is the refrigeration mode, the operation state of the heat exchange device is controlled according to the first water temperature, a second water temperature of the water inlet, a third water temperature of the water outlet, a refrigerant temperature of a refrigerant outlet of the plate heat exchanger and the high-pressure saturation temperature based on the electromagnetic valve and a first multi-connected unit control strategy, which comprises comparing the size relationship between the first water temperature and the high-pressure saturation temperature; if the first water temperature is smaller than the high-pressure saturation temperature, the heat exchange device is controlled to be opened based on the electromagnetic valve, the first electronic expansion valve and the second electronic expansion valve are controlled to be fully opened, and the operation state of the plate heat exchanger is controlled according to the second water temperature, the third water temperature and the refrigerant temperature; if the first water temperature is greater than or equal to the high-pressure saturation temperature, the heat exchange device is controlled to be closed based on the electromagnetic valve; a second control unit, if the operation mode of the multi-connected unit is the heating mode, the number of current indoor units is acquired, and the operation state of the heat exchange device is controlled according to the first water temperature, the number of the current indoor units, the second water temperature, the third water temperature, the refrigerant temperature and the high-pressure saturation temperature based on the electromagnetic valve and a second multi-connected unit control strategy, which comprises judging the proportional relationship between the number of the current indoor units and the total number of indoor units; if the number of the current indoor units is smaller than half of the total number of indoor units, the operation state of the heat exchange device is controlled according to the size relationship between the first water temperature and the high-pressure saturation temperature; if no indoor unit is in operation, the temperature range of a temperature difference value between the second water temperature and the third water temperature is judged, the water pump gear position of the plate heat exchanger is controlled according to the temperature range; if the number of the current indoor units is half of the total number of indoor units or more, the heat exchange device is controlled to be closed.

8. A multi-split air conditioning system, characterized in that, The multi-connected unit realizes the steps of the method in any one of claims 1-6 when in operation.

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