CN117685651A

CN117685651A - Control method and air conditioner

Info

Publication number: CN117685651A
Application number: CN202311822162.9A
Authority: CN
Inventors: 李海龙
Original assignee: Nanjing TICA Climate Solutions Co Ltd
Current assignee: Nanjing TICA Climate Solutions Co Ltd
Priority date: 2023-12-26
Filing date: 2023-12-26
Publication date: 2024-03-12

Abstract

The invention discloses a control method and an air conditioner. The control method is used for controlling the air conditioner, the air conditioner comprises a refrigerant refrigerating assembly and a water cooling assembly, the refrigerant refrigerating assembly comprises a frequency converter, an economizer and a refrigerant pipe, the refrigerant pipe is connected with the economizer and passes through the frequency converter, the water cooling assembly comprises a main water pipe and a bypass pipe connected with the main water pipe, the main water pipe is provided with a water inlet side, and the bypass pipe passes through the frequency converter; the control method comprises the following steps: acquiring the current water inlet temperature and the current environment temperature of a water inlet side; calculating the difference between the current water inlet temperature of the water inlet side and the current environment temperature; when the difference between the current water inlet temperature of the water inlet side and the current environment temperature is smaller than the first preset temperature, the bypass pipe is controlled to be opened and the economizer of the air conditioner is controlled to convey the supercooled refrigerant to the frequency converter of the air conditioner. Because the frequency converter receives the supercooled state refrigerant transmitted by the economizer, the temperature of the supercooled state refrigerant is higher than the dew point temperature, and therefore condensation is not easy to generate in the frequency converter.

Description

Control method and air conditioner

Technical Field

The invention relates to the technical field of air conditioners, in particular to a control method and an air conditioner.

Background

For air conditioning, temperature control of the inverter is extremely important. In order to enable the frequency converter to stably work, the frequency converter needs to be cooled down so that heating components in the frequency converter can operate in an optimal temperature range. In the related art, when the inverter is cooled, the inside of the inverter is easily condensed.

Disclosure of Invention

The invention provides a control method and an air conditioner.

The control method of the embodiment of the invention is used for controlling an air conditioner, the air conditioner comprises a refrigerant refrigeration component and a water cooling component, the refrigerant refrigeration component comprises a frequency converter, an economizer and a refrigerant pipe, the refrigerant pipe is connected with the economizer and passes through the frequency converter, the water cooling component comprises a main water pipe and a bypass pipe connected with the main water pipe, the main water pipe is provided with a water inlet side, and the bypass pipe passes through the frequency converter; the control method comprises the following steps:

acquiring the current water inlet temperature and the current environment temperature of the water inlet side;

calculating a difference between the current water inlet temperature of the water inlet side and the current environment temperature;

when the difference between the current water inlet temperature of the water inlet side and the current environment temperature is smaller than a first preset temperature, the bypass pipe is controlled to be opened, and the economizer of the air conditioner is controlled to convey the supercooled refrigerant to the frequency converter of the air conditioner.

In the control method of the embodiment of the invention, when the difference between the current water inlet temperature of the water inlet side and the current environment temperature is smaller than the first preset temperature, the current water inlet temperature of the water inlet side is close to the current environment temperature, so that the frequency converter needs to be cooled by adopting a refrigerant, and the frequency converter receives the supercooled refrigerant conveyed by the economizer, and the temperature of the supercooled refrigerant is higher than the dew point temperature, so that condensation is not easy to generate in the frequency converter.

In some embodiments, the frequency converter comprises a first inlet, a second inlet, a first outlet and a second outlet, the refrigerant pipe comprises a first pipe section, a second pipe section and a third pipe section, one end of the first pipe section is connected with the first inlet, the other end of the first pipe section is connected with the economizer, the second pipe section is connected with the third pipe section in parallel, and the second pipe section and the third pipe section are both connected with the first outlet; the bypass pipe comprises a first bypass pipe and a second bypass pipe, the first bypass pipe is connected with a second inlet of the frequency converter, the second bypass pipe is connected with a second outlet of the frequency converter, and the control method comprises the following steps:

when the difference between the current water inlet temperature of the water inlet side and the current environment temperature is larger than or equal to a second preset temperature, the second pipe section and the third pipe section are controlled to be disconnected, cooling water is controlled to flow into the frequency converter from the second inlet through the first bypass pipe, and flow out of the frequency converter from the second outlet through the second bypass pipe, and the second preset temperature is larger than the first preset temperature.

In some embodiments, the first bypass pipe is provided with a first electromagnetic valve, the first electromagnetic valve is used for controlling on-off of the first bypass pipe, and the control method includes:

And when the difference value between the current water inlet temperature of the water inlet side and the current environment temperature is greater than or equal to a second preset temperature, controlling the first electromagnetic valve to be opened.

In some embodiments, the second pipe section is provided with a second electromagnetic valve, the second electromagnetic valve is used for controlling on-off of the second pipe section, the third pipe section is provided with a first electronic expansion valve, the first electronic expansion valve is used for controlling flow of refrigerant in the third pipe section, and the control method comprises:

and when the difference value between the current water inlet temperature of the water inlet side and the current environment temperature is greater than or equal to a second preset temperature, controlling the first electronic expansion valve and the second electromagnetic valve to be closed.

In certain embodiments, the control method comprises:

when the difference between the current water inlet temperature of the water inlet side and the current environment temperature is greater than or equal to a third preset temperature, the frequency converter is controlled to be powered off, the second pipe section and the third pipe section are controlled to be powered off, cooling water is controlled to flow into the frequency converter from the second inlet through the first bypass pipe, and flows out of the frequency converter from the second outlet through the second bypass pipe, and the third preset temperature is greater than the second preset temperature.

In some embodiments, the refrigerant pipe includes a fourth pipe section, the fourth pipe section is connected with the second pipe section and the third pipe section, a second electromagnetic valve is arranged on the second pipe section, the second electromagnetic valve is used for controlling on-off of the second pipe section, a first electronic expansion valve is arranged on the third pipe section, the first electronic expansion valve is used for controlling flow of refrigerant in the third pipe section, the refrigerant refrigeration assembly further includes a second electronic expansion valve and an evaporator, one end of the second electronic expansion valve is connected with the economizer, and the other end of the second electronic expansion valve is connected with the evaporator through the fourth pipe section, and the control method includes:

when the difference between the current water inlet temperature of the water inlet side and the current environment temperature is smaller than the first preset temperature, controlling the second electronic expansion valve to be opened, and controlling the first electronic expansion valve and the second electromagnetic valve to be opened;

when the difference between the current water inlet temperature of the water inlet side and the current environment temperature is greater than or equal to the second preset temperature, the second electronic expansion valve is controlled to be opened, and the first electronic expansion valve and the second electromagnetic valve are controlled to be closed.

In some embodiments, the refrigerant refrigeration assembly includes an evaporator and a wind side heat exchanger, the water cooling assembly includes an electric three-way valve and a connecting pipe connected with the electric three-way valve, the electric three-way valve includes a first valve port and a second valve port, the electric three-way valve is connected with the evaporator through the connecting pipe, the wind side heat exchanger includes a third inlet and a third outlet, the main water pipe includes a water inlet pipe and a water return pipe, one end of the water inlet pipe is connected with the first valve port, the other end of the water inlet pipe is connected with the third inlet, one end of the water return pipe is connected with the second valve port, and the other end of the water return pipe is connected with the third outlet, the control method includes:

when the difference between the current water inlet temperature of the water inlet side and the current environment temperature is smaller than the first preset temperature, controlling cooling water to flow into the electric three-way valve from the first valve port, so that the cooling water flows into the evaporator through the connecting pipe;

when the difference between the current water inlet temperature of the water inlet side and the current environment temperature is greater than or equal to a second preset temperature, controlling the cooling water to flow into the wind side heat exchanger through the water inlet pipe and the third inlet, controlling the cooling water to flow into the water return pipe from the third outlet and flow into the electric three-way valve from the second valve port through the water return pipe, and enabling the cooling water to flow into the evaporator through the connecting pipe, wherein the second preset temperature is greater than the first preset temperature;

When the difference between the current water inlet temperature of the water inlet side and the current environment temperature is greater than or equal to a third preset temperature, controlling the cooling water to flow into the wind side heat exchanger through the water inlet pipe and flow into the wind side heat exchanger from the third inlet, controlling the cooling water to flow into the water return pipe from the third outlet and flow into the electric three-way valve from the second valve port through the water return pipe, and accordingly enabling the cooling water to flow into the evaporator through the connecting pipe, wherein the third preset temperature is greater than the second preset temperature.

In some embodiments, the wind side heat exchanger includes a fourth inlet and a fourth outlet, the fourth outlet being connected to the economizer, the refrigerant cooling assembly further includes a compressor, one end of the compressor is connected to the evaporator, and the other end of the compressor is connected to the fourth inlet, the control method includes:

when the difference between the current water inlet temperature of the water inlet side and the current environment temperature is smaller than the first preset temperature, controlling the refrigerant in the evaporator to be input into the compressor, controlling the refrigerant in the compressor to be input into the wind side heat exchanger from the fourth inlet, and controlling the refrigerant in the wind side heat exchanger to be conveyed to the economizer from the fourth outlet;

When the difference between the current water inlet temperature of the water inlet side and the current environment temperature is greater than or equal to the second preset temperature, controlling the refrigerant in the evaporator to be input into the compressor, controlling the refrigerant in the compressor to be input into the wind side heat exchanger from the fourth inlet, and controlling the refrigerant in the wind side heat exchanger to be conveyed to the economizer from the fourth outlet;

and when the difference value between the current water inlet temperature of the water inlet side and the current environment temperature is greater than or equal to the third preset temperature, controlling the compressor to be powered off.

In some embodiments, the compressor includes a gas-compensating port, the economizer includes a fifth inlet, a fifth outlet, and a sixth outlet, the refrigerant pipe includes a fifth pipe section, the fifth pipe section connects the sixth outlet and the compressor, the refrigerant refrigeration assembly includes a third electronic expansion valve and a third solenoid valve, one end of the third electronic expansion valve is connected to the fifth outlet, the other end of the third electronic expansion valve is connected to the fifth inlet, one end of the third solenoid valve is connected to the sixth outlet, and the other end of the third solenoid valve is connected to the gas-compensating port, the control method includes:

When the difference between the current water inlet temperature of the water inlet side and the current environment temperature is smaller than the first preset temperature, controlling the refrigerant in the economizer to flow out of the economizer from the fifth outlet, controlling the refrigerant flowing out of the economizer to flow into the economizer from the fifth inlet, and controlling the refrigerant in the economizer to be input into the air supplementing port from the sixth outlet;

when the difference between the current water inlet temperature of the water inlet side and the current environment temperature is greater than or equal to the second preset temperature, controlling the refrigerant in the economizer to flow out of the economizer from the fifth outlet, controlling the refrigerant flowing out of the economizer to flow into the economizer from the fifth inlet, and controlling the refrigerant in the economizer to be input into the air supplementing port from the sixth outlet.

An air conditioner according to an embodiment of the present invention includes a memory for storing a computer program and a controller for executing the computer program to implement the control method according to any one of the above embodiments.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic diagram of an air conditioner according to an embodiment of the present invention when a difference between a current water inlet temperature and a current ambient temperature at a water inlet side is less than a first preset temperature;

FIG. 2 is a flow chart of a control method according to an embodiment of the present invention;

fig. 3 is a schematic view of an air conditioner according to an embodiment of the present invention;

FIG. 4 is an enlarged view of a portion a of the air conditioner of FIG. 1;

FIG. 5 is a schematic view of an air conditioner according to an embodiment of the present invention when a difference between a current inlet water temperature and a current ambient temperature at a water inlet side is greater than or equal to a second preset temperature;

FIG. 6 is a flow chart of a control method according to an embodiment of the present invention;

FIG. 7 is a schematic view of an air conditioner according to an embodiment of the present invention when a difference between a current inlet water temperature and a current ambient temperature at a water inlet side is greater than or equal to a third preset temperature;

FIG. 8 is a flow chart of a control method according to an embodiment of the present invention;

FIG. 9 is a flow chart of a control method according to an embodiment of the present invention;

fig. 10 is a c-section enlarged view of the air conditioner of fig. 5;

FIG. 11 is a flow chart of a control method according to an embodiment of the present invention;

FIG. 12 is a flow chart of a control method according to an embodiment of the present invention;

fig. 13 is a b-section enlarged view of the air conditioner of fig. 1;

fig. 14 is a flow chart of a control method according to an embodiment of the present invention.

Reference numerals illustrate:

an air conditioner 100; a refrigerant refrigeration assembly 10; a water cooling assembly 20; a frequency converter 11; an economizer 12; a refrigerant pipe 13; a main water pipe 21; a bypass pipe 22; a water inlet side 210; a memory 200; a controller 300; a control line 400; a first inlet 110; a second inlet 111; a first outlet 112; a second outlet 113; a first tube segment 130; a second tube segment 131; a third tube segment 132; a first bypass pipe 220; a second bypass pipe 221; a first solenoid valve 101; a second solenoid valve 102; a first electronic expansion valve 103; a fourth pipe section 133; a second electronic expansion valve 104; an evaporator 30; a wind side heat exchanger 40; an electric three-way valve 23; a connection pipe 24; the first valve port 230; a second valve port 231; a third inlet 41; a third outlet 42; a water inlet pipe 211; a return pipe 212; a water outlet side 213; a fourth inlet 43; a fourth outlet 44; a condenser 45; natural cooling coil 46; a compressor 14; a make-up port 140; a fifth inlet 120; a fifth outlet 121; a sixth outlet 122; a fifth tube segment 134; a third electronic expansion valve 105; and a third solenoid valve 106.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Referring to fig. 1 and 2, the control method according to the embodiment of the present invention is used for controlling an air conditioner 100, the air conditioner 100 includes a refrigerant refrigeration assembly 10 and a water cooling assembly 20, the refrigerant refrigeration assembly 10 includes a frequency converter 11, an economizer 12 and a refrigerant pipe 13, the refrigerant pipe 13 is connected with the economizer 12 and passes through the frequency converter 11, the water cooling assembly 20 includes a main water pipe 21 and a bypass pipe 22 connected with the main water pipe 21, the main water pipe 21 has a water inlet side 210, and the bypass pipe 22 passes through the frequency converter 11; the control method comprises the following steps:

S10, acquiring the current water inlet temperature and the current environment temperature of the water inlet side 210;

s20, calculating a difference value between the current water inlet temperature of the water inlet side 210 and the current environment temperature;

s30, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is smaller than the first preset temperature, the bypass pipe 22 is controlled to be opened and the economizer 12 of the air conditioner 100 is controlled to deliver the supercooled refrigerant to the frequency converter 11 of the air conditioner 100.

Referring to fig. 3, the air conditioner 100 according to the embodiment of the present invention includes a memory 200 and a controller 300, wherein the memory 200 is used for storing a computer program, and the controller 300 is used for acquiring a current water inlet temperature and a current ambient temperature of the water inlet side 210; and for calculating a difference between the current inlet water temperature of the inlet side 210 and the current ambient temperature; and is used for controlling the bypass pipe 22 to be opened and controlling the economizer 12 of the air conditioner 100 to deliver the supercooled refrigerant to the inverter 11 of the air conditioner 100 when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is less than the first preset temperature.

In the control method according to the embodiment of the present invention, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is smaller than the first preset temperature, the current water inlet temperature of the water inlet side 210 is close to the current ambient temperature, so that the frequency converter 11 needs to be cooled by using the refrigerant, and the frequency converter 11 receives the supercooled refrigerant from the economizer 12, and the temperature of the supercooled refrigerant is higher than the dew point temperature, so that condensation is not easy to generate inside the frequency converter 11.

Specifically, the air conditioner 100 is an apparatus for adjusting indoor temperature and humidity, and the air conditioner 100 may include an evaporator 30, a compressor 14, a wind side heat exchanger 40, an economizer 12, a frequency converter 11, and a valve member for controlling a flow rate of a refrigerant in the air conditioner 100, etc. The refrigerant cooling unit 10 is a unit for realizing a cooling effect by circulating a refrigerant. The refrigerant pipe 13 is a pipe through which a refrigerant flows, and the refrigerant pipe 13 may be used to contact each device in the air conditioner 100, thereby cooling each device by means of refrigerant circulation. The refrigerant may be R410A, R407C or the like.

The inverter 11 is a device for controlling the power frequency of the compressor 14 or other devices of the air conditioner 100, thereby adjusting the operation speed and power of the devices. For example, a control circuit 400 may be provided between the inverter 11 and the compressor 14 of the air conditioner 100 to control the start and operation of the compressor 14. The economizer 12 is a device for recovering and reusing the refrigerant, and can increase the energy efficiency ratio of the air conditioner 100.

The economizer 12 may be used to supercool the refrigerant and output the supercooled refrigerant, and the economizer 12 may reduce the temperature of the refrigerant by about 10 ℃. For example, the temperature of the refrigerant flowing into the economizer 12 may be 40 ℃, and the temperature of the refrigerant flowing out of the economizer 12 may be 30 ℃. The temperature of the refrigerant in the supercooled state is higher than the dew point temperature. Therefore, the refrigerant in the supercooling state is adopted to cool the frequency converter 11 into sensible heat exchange, and the phase state of the refrigerant is not changed in the sensible heat exchange, so that the heat exchange mode can reduce the probability of condensation of the frequency converter 11.

The water cooling assembly 20 is an assembly for achieving a cooling effect on the internal components of the air conditioner 100 through water circulation, and the water cooling assembly 20 may include a main water pipe 21, a bypass pipe 22 connected to the main water pipe 21, and the main water pipe 21 and the bypass pipe 22 may be used for cooling water to flow. The water inlet side 210 may be a side of the main water pipe 21 supplementing the cooling water, and the water inlet side 210 may be located near the water source, thereby improving the water supplementing efficiency. The bypass pipe 22 may be used to supply cooling water to the inverter 11 to achieve water cooling of the inverter 11. The bypass pipe 22 may be in contact with a heat generating component in the inverter 11, and cooling of the inverter 11 may be achieved by circulating cooling water. By closing the bypass pipe 22, the inverter 11 is cooled by the supercooled refrigerant outputted from the economizer 12.

The heat generating components are IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistors) and SCRs (Silicon Control led Rectifier, silicon controlled rectifiers) in the inverter 11. The SCR can rectify and convert ac into dc, and the IGBT can convert dc into ac, and the heat emitted in the process accounts for 70-80% of the total heat emitted by the inverter 11.

The current inlet water temperature and the current ambient temperature of the inlet water side 210 may be obtained by means of a water temperature sensor, a temperature sensor, etc., respectively, and a difference between the current inlet water temperature and the current ambient temperature is calculated by the controller 300. The first preset temperature may be a preset temperature threshold, for example, the first preset temperature may be 1.6 ℃, 1.7 ℃, 1.8 ℃, 1.9 ℃, 2 ℃, etc.

Referring to fig. 1, 4, 5 and 6, in some embodiments, the frequency converter 11 includes a first inlet 110, a second inlet 111, a first outlet 112 and a second outlet 113, the refrigerant pipe 13 includes a first pipe section 130, a second pipe section 131 and a third pipe section 132, one end of the first pipe section 130 is connected to the first inlet 110, the other end of the first pipe section 130 is connected to the economizer 12, the second pipe section 131 is connected in parallel with the third pipe section 132, and both the second pipe section 131 and the third pipe section 132 are connected to the first outlet 112; the bypass pipe 22 includes a first bypass pipe 220 and a second bypass pipe 221, the first bypass pipe 220 is connected to the second inlet 111 of the inverter 11, the second bypass pipe 221 is connected to the second outlet 113 of the inverter 11, and the control method includes:

s40, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the second pipe segment 131 and the third pipe segment 132 are controlled to be disconnected, and cooling water is controlled to flow into the frequency converter 11 from the second inlet 111 through the first bypass pipe 220 and flow out of the frequency converter 11 from the second outlet 113 through the second bypass pipe 221, wherein the second preset temperature is greater than the first preset temperature.

Referring to fig. 3, in some embodiments, the controller 300 is configured to control the second pipe segment 131 and the third pipe segment 132 to be disconnected and control the cooling water to flow into the inverter 11 from the second inlet 111 through the first bypass 220 and flow out of the inverter 11 from the second outlet 113 through the second bypass 221 when the difference between the current inlet water temperature of the inlet side 210 and the current ambient temperature is greater than or equal to a second preset temperature, the second preset temperature being greater than the first preset temperature.

In this way, when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the heat inside the frequency converter 11 can be rapidly taken away by controlling the cooling water through the first bypass pipe 220, thereby rapidly cooling the frequency converter 11. In addition, since the current inlet water temperature of the inlet water side 210 is higher than the current ambient temperature and higher than the dew point temperature, the probability of occurrence of condensation of the inverter 11 is low, and the current inlet water temperature of the inlet water side 210 is low with respect to the temperature of the refrigerant in a supercooled state, so that the inverter 11 can be rapidly cooled.

Specifically, the first inlet 110, the second inlet 111, the first outlet 112, and the second outlet 113 may be interfaces for inflow or outflow of the refrigerant. The first, second and third tube sections 130, 131 and 132 may be portions of the refrigerant tube 13 for connecting different components. The first bypass pipe 220 and the second bypass pipe 221 may be different parts of the bypass pipe 22 connecting different interfaces on the frequency converter 11.

The second preset temperature may be a temperature greater than the first preset temperature. For example, when the first preset temperature is 2 ℃, the second preset temperature may be 3 ℃, 3.1 ℃, 3.2 ℃, 3.5 ℃, 3.7 ℃, or the like. The disconnection of the second pipe segment 131 and the third pipe segment 132 means that the refrigerant cannot flow to the rear segment through the second pipe segment 131 and the third pipe segment 132. This may be achieved by providing valve elements such as solenoid valves or electronic expansion valves on the second and third tube sections 131, 132.

Cooling water is input into the frequency converter 11 through the first bypass pipe 220 and flows out of the frequency converter 11 through the second bypass pipe 221, and chilled water can be used as an intermediate medium to rapidly release heat generated inside the frequency converter 11. The difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than the second preset temperature, that is, the temperature of the cooling water is greater than the ambient temperature, so that the heat exchange mode for the frequency converter 11 is sensible heat exchange, and the probability of condensation of the frequency converter 11 can be reduced.

Referring to fig. 4 and fig. 5, in some embodiments, a first solenoid valve 101 is disposed on a first bypass pipe 220, and the first solenoid valve 101 is used to control on-off of the first bypass pipe 220, and the control method includes:

when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the first solenoid valve 101 is controlled to open.

Referring to fig. 3, in some embodiments, the controller 300 is configured to control the first electromagnetic valve 101 to open when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the second preset temperature.

In this way, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the frequency converter 11 can be rapidly cooled by automatically controlling the on-off of the first electromagnetic valve 101.

Specifically, the first solenoid valve 101 is a valve for controlling the flow of fluid, and the first solenoid valve 101 may open or close a valve port to thereby open or close the first bypass pipe 220. When the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the required cooling effect may not be achieved by using the refrigerant in a supercooled state, so that the frequency converter 11 is rapidly and sufficiently cooled by controlling the first electromagnetic valve 101 to be opened and adopting a cooling water inlet mode.

Referring to fig. 4 and 5, in some embodiments, a second electromagnetic valve 102 is disposed on a second pipe segment 131, the second electromagnetic valve 102 is used for controlling on/off of the second pipe segment 131, a first electronic expansion valve 103 is disposed on a third pipe segment 132, the first electronic expansion valve 103 is used for controlling flow of a refrigerant in the third pipe segment 132, and the control method includes:

When the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the first electronic expansion valve 103 and the second electromagnetic valve 102 are controlled to be closed.

Referring to fig. 3, in some embodiments, the controller 300 is configured to control the first electronic expansion valve 103 and the second electromagnetic valve 102 to close when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to a second preset temperature.

In this way, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the second preset temperature, both the first electronic expansion valve 103 and the second solenoid valve 102 are closed, the inverter 11 at this time is cooled by the cooling water, the temperature of which is higher than the current ambient temperature and higher than the dew point temperature, so that the probability of condensation of the inverter 11 is low, and the temperature of the cooling water is low with respect to the temperature of the refrigerant in a supercooled state, so that the inverter 11 can be rapidly cooled.

In addition, the first electronic expansion valve 103 and the second electromagnetic valve 102 can respectively control the flow of the refrigerant in the third pipe section 132 or the on-off of the second pipe section 131, so that the cooling of the frequency converter 11 can adapt to various different scenes, thereby improving the flexibility of water cooling.

Specifically, the second solenoid valve 102 is a valve for controlling the flow of fluid, and the second solenoid valve 102 may open or close the valve port to thereby open or close the second pipe segment 131. The first electronic expansion valve 103 is a valve for controlling the flow rate and pressure of the refrigerant, and the first electronic expansion valve 103 can control the flow rate of the refrigerant in the third pipe section 132 by adjusting the opening degree. When the first electronic expansion valve 103 and the second solenoid valve 102 are closed, the refrigerant cannot pass through the second pipe segment 131 and the third pipe segment 132, and the inverter 11 at this time is cooled by the cooling water flowing in through the first bypass pipe 220.

Referring to fig. 7 and 8, in some embodiments, the control method includes:

s50, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to a third preset temperature, the frequency converter 11 is controlled to be powered off, the second pipe segment 131 and the third pipe segment 132 are controlled to be powered off, cooling water is controlled to flow into the frequency converter 11 through the first bypass pipe 220 and flow out of the frequency converter 11 through the second bypass pipe 221, and the third preset temperature is greater than the second preset temperature.

Referring to fig. 3, in some embodiments, the controller 300 is configured to control the frequency converter 11 to be powered off, control the second pipe segment 131 and the third pipe segment 132 to be powered off, and control the cooling water to flow into the frequency converter 11 through the first bypass 220 and flow out of the frequency converter 11 through the second bypass 221 when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to a third preset temperature, wherein the third preset temperature is greater than the second preset temperature.

Thus, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the third preset temperature, the current water inlet temperature of the water inlet side 210 is higher and the current ambient temperature is lower, the frequency converter 11 is controlled to be in a power-off state so as to protect components inside the frequency converter 11, and cooling water with higher temperature is controlled to enter the frequency converter 11 so as to maintain the temperature inside the frequency converter 11, so that the components inside the frequency converter 11 can be stored in a proper temperature range when the ambient temperature is lower.

Specifically, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the third preset temperature, the ambient temperature is low, and the frequency converter 11 may be controlled to be powered off. When the frequency converter 11 is powered off, components inside the frequency converter 11 do not generate heat, so that cooling water with higher temperature is introduced, the components inside the frequency converter 11 can be stored in a proper temperature range when the ambient temperature is lower, and the problem of storage of the frequency converter 11 in cold environments such as winter can be solved. Wherein the third preset temperature may be 15 ℃, 15.2 ℃, 15.5 ℃, 15.6 ℃, 15.7 ℃, etc.

Referring to fig. 1, 4, 5 and 9, in some embodiments, the refrigerant tube 13 includes a fourth tube segment 133, the fourth tube segment 133 is connected to the second tube segment 131 and the third tube segment 132, the second tube segment 131 is provided with a second electromagnetic valve 102, the second electromagnetic valve 102 is used for controlling on-off of the second tube segment 131, the third tube segment 132 is provided with a first electronic expansion valve 103, the first electronic expansion valve 103 is used for controlling flow of refrigerant in the third tube segment 132, the refrigerant refrigeration assembly 10 further includes a second electronic expansion valve 104 and an evaporator 30, one end of the second electronic expansion valve 104 is connected to the economizer 12, and the other end of the second electronic expansion valve 104 is connected to the evaporator 30 through the fourth tube segment 133, and the control method includes:

S60, when the difference between the current water inlet temperature of the water inlet side 210 and the current environment temperature is smaller than the first preset temperature, controlling the second electronic expansion valve 104 to be opened, and controlling the first electronic expansion valve 103 and the second electromagnetic valve 102 to be opened;

s70, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the second preset temperature, controlling the second electronic expansion valve 104 to be opened and controlling the first electronic expansion valve 103 and the second electromagnetic valve 102 to be closed.

There is no timing limitation between S60 and S70, or S60 and S70 may be performed simultaneously or time-sharing.

Referring to fig. 3, in some embodiments, the controller 300 is configured to control the second electronic expansion valve 104 to open and control the first electronic expansion valve 103 and the second electromagnetic valve 102 to open when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is less than a first preset temperature; and is configured to control the second electronic expansion valve 104 to be opened and control the first electronic expansion valve 103 and the second electromagnetic valve 102 to be closed when a difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to a second preset temperature.

Thus, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is smaller than the first preset temperature, a part of the supercooled refrigerant in the economizer 12 flows to the electronic expansion valve, and a part of the supercooled refrigerant flows to the inverter 11 through the economizer 12, and the supercooled refrigerant is not easy to generate condensation in the inverter 11 because the temperature of the supercooled refrigerant is higher than the dew point temperature. When the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the frequency converter 11 can be cooled by using a water cooling mode, so as to improve the cooling efficiency.

In addition, after the first electronic expansion valve 103 and the second electromagnetic valve 102 are opened, the refrigerant can flow into the fourth pipe section 133 through the third pipe section 132 and the second pipe section 131, thereby increasing the flow rate of the refrigerant in the fourth pipe section 133, and improving the refrigerating effect.

Specifically, the fourth pipe segment 133 may be a portion of the refrigerant pipe 13 for connecting different components, and the fourth pipe segment 133 may be connected to the second pipe segment 131 and the third pipe segment 132, so as to enable the refrigerant passing through the inverter 11 to flow out from the rear end of the second electronic expansion valve 104. The evaporator 30 is a member for exchanging heat with the refrigerant, and can transfer heat in the refrigerant to the environment.

When the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is smaller than the first preset temperature, a part of the supercooled refrigerant output by the economizer 12 throttles through the second electronic expansion valve 104 and enters the evaporator 30 to absorb heat by vaporization, and a part of the supercooled refrigerant enters the inverter 11 to cool the inverter 11, and is input into the fourth pipe section 133 through the second pipe section 131 and the third pipe section 132, i.e. the rear end of the second electronic expansion valve 104 and then enters the evaporator 30 to absorb heat by vaporization.

When the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the supercooled refrigerant output from the economizer 12 will be throttled by the second electronic expansion valve 104 and enter the evaporator 30 to absorb heat by vaporization, and the refrigerant will not enter the inverter 11 again because the first electronic expansion valve 103 and the second electromagnetic valve 102 are closed.

When the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is smaller than the first preset temperature, the second electronic expansion valve 104 may be controlled to be opened, and the first electronic expansion valve 103 and the second electromagnetic valve 102 may be controlled to be opened, which may increase the flow of the refrigerant in the inverter 11, thereby improving the cooling efficiency of the inverter 11. For example, under the normal working condition, the sensible heat exchange of the frequency converter 11 can be realized by adjusting the opening of the first electronic expansion valve 103 so as to control the flow rate flowing through the frequency converter 11; under the condition that the load of the frequency converter 11 is large, the opening of the first electronic expansion valve 103 can be regulated to throttle the refrigerant to realize latent heat cooling, and as the frequency converter 11 receives the supercooled refrigerant from the economizer 12, when the load of the frequency converter 11 is large, the environment temperature of the frequency converter 11 area is high, so that the efficiency of refrigerant cooling can be improved by adopting latent heat cooling and condensation is not easy to generate; under the working conditions that the frequency converter 11 is in a fast loading state and the like and approaches to the limit, the components inside the frequency converter 11 can generate very large heat in a short time, and at the moment, the second electromagnetic valve 102 can be opened to meet the cooling requirement of the frequency converter 11.

When the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the required cooling effect may not be achieved by using the refrigerant in a supercooling state, so that the frequency converter 11 is rapidly and sufficiently cooled by controlling the first electronic expansion valve 103 and the second electromagnetic valve 102 to be closed in a cooling water inlet manner.

Referring to fig. 1, 5, 7, 10 and 11, in some embodiments, the refrigerant cooling assembly 10 includes an evaporator 30 and a wind side heat exchanger 40, the water cooling assembly 20 includes an electric three-way valve 23 and a connection pipe 24 connected to the electric three-way valve 23, the electric three-way valve 23 includes a first valve port 230 and a second valve port 231, the electric three-way valve 23 is connected to the evaporator 30 through the connection pipe 24, the wind side heat exchanger 40 includes a third inlet 41 and a third outlet 42, the main water pipe 21 includes a water inlet pipe 211 and a water return pipe 212, one end of the water inlet pipe 211 is connected to the first valve port 230, the other end of the water inlet pipe 211 is connected to the third inlet 41, one end of the water return pipe 212 is connected to the second valve port 231, and the other end of the water return pipe 212 is connected to the third outlet 42, and the control method includes:

s80, when the difference between the current water inlet temperature of the water inlet side 210 and the current environment temperature is smaller than a first preset temperature, controlling the cooling water to flow into the electric three-way valve 23 from the first valve port 230, so that the cooling water flows into the evaporator 30 through the connecting pipe 24;

S90, when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to a second preset temperature, controlling the cooling water to flow into the wind side heat exchanger 40 through the inlet pipe 211 and from the third inlet 41, controlling the cooling water to flow into the return pipe 212 from the third outlet 42, and flowing into the electric three-way valve 23 through the return pipe 212 from the second valve port 231, thereby allowing the cooling water to flow into the evaporator 30 through the connection pipe 24, the second preset temperature being greater than the first preset temperature;

s100, when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to a third preset temperature, controlling the cooling water to flow into the wind side heat exchanger 40 through the inlet pipe 211 and from the third inlet 41, controlling the cooling water to flow into the return pipe 212 from the third outlet 42, and flowing into the electric three-way valve 23 through the return pipe 212 from the second valve port 231, thereby allowing the cooling water to flow into the evaporator 30 through the connection pipe 24, the third preset temperature being greater than the second preset temperature.

There is no timing limitation between S80, S90 and S100, or S80, S90 and S100 may be performed simultaneously or in a time-sharing manner.

Referring to fig. 3, in some embodiments, the controller 300 is configured to control the cooling water to flow from the first valve port 230 into the electric three-way valve 23 when the difference between the current inlet water temperature of the inlet side 210 and the current ambient temperature is less than a first preset temperature, so that the cooling water flows into the evaporator 30 through the connection pipe 24; and for controlling the cooling water to flow into the wind side heat exchanger 40 through the water inlet pipe 211 and from the third inlet 41 and the cooling water to flow into the water return pipe 212 from the third outlet 42 and to flow into the electric three-way valve 23 through the water return pipe 212 from the second valve port 231 when the difference between the current inlet water temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to a second preset temperature, which is greater than the first preset temperature, through the connection pipe 24; and for controlling the cooling water to flow into the wind side heat exchanger 40 through the water inlet pipe 211 and from the third inlet 41 and the cooling water to flow into the water return pipe 212 from the third outlet 42 and to flow into the electric three-way valve 23 from the second valve port 231 through the water return pipe 212 when the difference between the current inlet water temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to a third preset temperature, which is greater than the second preset temperature, through the connection pipe 24.

Thus, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is smaller than the first preset temperature, the current water inlet temperature of the water inlet side 210 is lower, and the cooling water can directly enter the evaporator 30 to avoid dissipating cold energy; when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the current water inlet temperature of the water inlet side 210 is higher, and the cooling water can enter the air side heat exchanger 40 for precooling and then enter the evaporator 30, so that the refrigerating effect of the air conditioner 100 is improved; when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the third preset temperature, the current inlet water temperature of the inlet water side 210 is higher, and the cooling water can be pre-cooled by the air side heat exchanger 40 and then enter the evaporator 30, so as to improve the refrigeration effect of the air conditioner 100.

Specifically, the wind-side heat exchanger 40 is a device for exchanging heat between the refrigerant and the environment. The wind side heat exchanger 40 may include a condenser 45 and a natural cooling coil 46, and the natural cooling coil 46 may be used to pre-cool the cooling water. The electric three-way valve 23 is a control valve capable of adjusting the flow path of the refrigerant, and the electric three-way valve 23 can have two modes of power supply and power failure. When the electric three-way valve 23 is powered on, the first valve port 230 is opened, and the second valve port 231 is closed; when the electric three-way valve 23 is powered off, the second valve port 231 is opened and the first valve port 230 is closed. The third inlet 41 of the wind side heat exchanger 40 may be a water inlet of cooling water and the third outlet 42 may be a water outlet of cooling water into the wind side heat exchanger 40. The evaporator 30 may also have a water outlet side 213, and when the cooling water flows out from the water outlet side 213 of the evaporator 30, the cooling water may be returned to the water inlet pipe 211 again, thereby achieving recycling of the cooling water.

When the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is smaller than the first preset temperature, the current inlet water temperature of the inlet water side 210 is lower at this time, and if the pre-cooling is performed by the wind side heat exchanger 40, the cooling water will dissipate the cooling energy, so that the cooling water will directly flow into the electric three-way valve 23 through the first valve port 230 and further flow into the evaporator 30 through the connecting pipe 24, thereby achieving the refrigerating effect. Wherein the connection pipe 24 is a pipe for cooling water to flow from the electric three-way valve 23 to the evaporator 30.

When the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the second preset temperature, or when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the third preset temperature, the current inlet water temperature of the inlet water side 210 is higher, so that pre-cooling by the wind side heat exchanger 40 is required, thereby improving the refrigerating efficiency.

Referring to fig. 1, 5, 7, 10 and 12, in some embodiments, the wind side heat exchanger 40 includes a fourth inlet 43 and a fourth outlet 44, the fourth outlet 44 is connected to the economizer 12, the refrigerant cooling assembly 10 further includes a compressor 14, one end of the compressor 14 is connected to the evaporator 30, and the other end of the compressor 14 is connected to the fourth inlet 43, and the control method includes:

S101, when the difference between the current water inlet temperature of the water inlet side 210 and the current environment temperature is smaller than a first preset temperature, controlling the refrigerant in the evaporator 30 to be input into the compressor 14, controlling the refrigerant in the compressor 14 to be input into the wind side heat exchanger 40 from the fourth inlet 43, and controlling the refrigerant in the wind side heat exchanger 40 to be conveyed to the economizer 12 from the fourth outlet 44;

s102, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the second preset temperature, controlling the refrigerant in the evaporator 30 to be input into the compressor 14, controlling the refrigerant in the compressor 14 to be input into the wind side heat exchanger 40 from the fourth inlet 43, and controlling the refrigerant in the wind side heat exchanger 40 to be conveyed to the economizer 12 from the fourth outlet 44;

s103, when the difference between the current water inlet temperature of the water inlet side 210 and the current environment temperature is greater than or equal to a third preset temperature, the compressor 14 is controlled to be powered off.

There is no timing limitation among S101, S102, and S103, or S101, S102, and S103 may be performed simultaneously or in a time-sharing manner.

Referring to fig. 3, in some embodiments, the controller 300 is configured to control the refrigerant in the evaporator 30 to be input into the compressor 14 and the refrigerant in the compressor 14 to be input into the wind side heat exchanger 40 from the fourth inlet 43 and control the refrigerant in the wind side heat exchanger 40 to be delivered from the fourth outlet 44 to the economizer 12 when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is less than the first preset temperature; and is configured to control the refrigerant in the evaporator 30 to be input into the compressor 14 and the refrigerant in the compressor 14 to be input into the wind side heat exchanger 40 from the fourth inlet 43 and the refrigerant in the wind side heat exchanger 40 to be delivered from the fourth outlet 44 to the economizer 12 when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the second preset temperature; and for controlling the compressor 14 to be powered off when the difference between the current inlet water temperature of the inlet side 210 and the current ambient temperature is greater than or equal to a third preset temperature.

In this manner, when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is less than the first preset temperature, and when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the refrigeration cycle of the air conditioner 100 may be completed by the evaporator 30, the compressor 14, the wind side heat exchanger 40, and the economizer 12 in cooperation. When the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the third preset temperature, the current ambient temperature at this time is low, so that the compressor 14 can be turned off and refrigeration can be achieved by the cooling water.

Specifically, the refrigerant may flow into the wind side heat exchanger 40 through the fourth inlet 43, and may flow out of the wind side heat exchanger 40 through the fourth outlet 44. When the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is less than the first preset temperature, or when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the current ambient temperature is higher, and the refrigerant is required to be used for refrigeration, so that the compressor 14 is still in an operating state at this time. When the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the third preset temperature, the current ambient temperature is lower, and the refrigerant refrigeration cycle is not needed, so that the compressor 14 can be controlled to be powered off to meet the scene requirement, and the energy consumption can be reduced.

Referring to fig. 1, 5, 13 and 14, in some embodiments, the compressor 14 includes a gas-compensating port 140, the economizer 12 includes a fifth inlet 120, a fifth outlet 121 and a sixth outlet 122, the refrigerant pipe 13 includes a fifth pipe section 134, the fifth pipe section 134 connects the sixth outlet 122 and the compressor 14, the refrigerant refrigerating assembly 10 includes a third electronic expansion valve 105 and a third solenoid valve 106, one end of the third electronic expansion valve 105 is connected with the fifth outlet 121, the other end of the third electronic expansion valve 105 is connected with the fifth inlet 120, one end of the third solenoid valve 106 is connected with the sixth outlet 122, and the other end of the third solenoid valve 106 is connected with the gas-compensating port 140, and the control method includes:

s104, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is smaller than the first preset temperature, controlling the refrigerant in the economizer 12 to flow out of the economizer 12 from the fifth outlet 121, controlling the refrigerant flowing out of the economizer 12 to flow into the economizer 12 from the fifth inlet 120, and controlling the refrigerant in the economizer 12 to input into the air compensating port 140 from the sixth outlet 122;

s105, when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the second preset temperature, controlling the refrigerant in the economizer 12 to flow out of the economizer 12 from the fifth outlet 121, controlling the refrigerant flowing out of the economizer 12 to flow into the economizer 12 from the fifth inlet 120, and controlling the refrigerant in the economizer 12 to input into the air supply port 140 from the sixth outlet 122.

There is no timing limitation between S104 and S105, or S104 and S105 may be performed simultaneously or in a time-sharing manner.

Referring to fig. 3, in some embodiments, the controller 300 is configured to control the refrigerant in the economizer 12 to flow out of the economizer 12 from the fifth outlet 121 and control the refrigerant flowing out of the economizer 12 from the fifth inlet 120 into the economizer 12 and control the refrigerant in the economizer 12 to flow into the make-up air port 140 from the sixth outlet 122 when the difference between the current inlet water temperature of the inlet side 210 and the current ambient temperature is less than the first preset temperature; and is used for controlling the refrigerant in the economizer 12 to flow out of the economizer 12 from the fifth outlet 121 and controlling the refrigerant flowing out of the economizer 12 to flow into the economizer 12 from the fifth inlet 120 and controlling the refrigerant in the economizer 12 to be input into the air supply port 140 from the sixth outlet 122 when the difference between the current inlet water temperature of the inlet side 210 and the current ambient temperature is greater than or equal to the second preset temperature.

In this way, when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is less than the first preset temperature, or when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the variable frequency system realizes the refrigerant circulation through the refrigerant pipe 13, and the fifth pipe section 134 is disposed between the compressor 14 and the economizer 12, so as to supplement the refrigerant into the compressor 14, thereby enhancing the refrigerating efficiency and capacity of the air conditioner 100.

Specifically, the refrigerant may flow out of the economizer 12 through the fifth outlet 121, and after being throttled by the third electronic expansion valve 105, re-enter the economizer 12 through the fifth inlet 120, then flow out of the economizer 12 through the sixth outlet 122, and finally be delivered to the make-up port 140 of the compressor 14 through the fifth pipe segment 134.

Referring to fig. 1, 4, 10 and 13, in a specific embodiment, when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is less than the first preset temperature, the refrigerant absorbs the heat of the cooled medium in the evaporator 30 and evaporates into a gaseous refrigerant. The gaseous refrigerant is delivered to the compressor 14, and is compressed into a high-temperature and high-pressure superheated refrigerant. The superheated refrigerant is sent to the condenser 45 of the wind side heat exchanger 40 to be condensed, and is changed into a high-pressure liquid refrigerant after condensation. The high pressure liquid refrigerant is subcooled in the economizer 12 to form a subcooled refrigerant. A part of the refrigerant in the supercooled state is supplied to the first inlet 110 through the first pipe section 130, thereby being supplied to the inverter 11, cools the heat generating components in the inverter 11, and then flows out from the first outlet 112 of the inverter 11, and is supplied to the fourth pipe section 133 through the second pipe section 131 and the third pipe section 132; a part of the refrigerant is conveyed to the third electronic expansion valve 105 for throttling, enters the economizer 12 again through the fifth inlet 120 for evaporation and vaporization, is converted into a refrigerant in an overheated state, and is conveyed to the air supplementing port 140 of the compressor 14 for compression through the fifth pipe section 134; the last portion is sent to a second electronic expansion valve 104 to throttle and further to evaporator 30 to vaporize and absorb heat. The cooling water at this time enters the electric three-way valve 23 through the first valve port 230 and further enters the evaporator 30 through the connection pipe 24.

Referring to fig. 4, 5, 10 and 13, when the difference between the current inlet water temperature of the inlet water side 210 and the current ambient temperature is greater than or equal to the second preset temperature, the refrigerant absorbs the heat of the cooled medium in the evaporator 30 and evaporates into a gaseous refrigerant. The gaseous refrigerant is delivered to the compressor 14, and is compressed into a high-temperature and high-pressure superheated refrigerant. The superheated refrigerant is sent to the condenser 45 of the wind side heat exchanger 40 to be condensed, and is changed into a high-pressure liquid refrigerant after condensation. The high pressure liquid refrigerant is subcooled in the economizer 12 to form a subcooled refrigerant. A part of the refrigerant in the supercooling state is conveyed to the third electronic expansion valve 105 for throttling, and enters the economizer 12 again through the fifth inlet 120 for evaporation and vaporization, and is converted into the refrigerant in the supercooling state, and the refrigerant in the supercooling state is conveyed to the air supplementing port 140 of the compressor 14 for compression through the fifth pipe section 134; a portion is routed to a second electronic expansion valve 104 to throttle and further routed to evaporator 30 to vaporize and absorb heat. A part of the cooling water at this time flows into the wind side heat exchanger 40 from the third inlet 41 through the water inlet pipe 211 and flows out of the wind side heat exchanger 40 from the third outlet 42, then flows into the electric three-way valve 23 from the second valve port 231 through the water return pipe 212 and further flows into the evaporator 30 through the connection pipe 24; a portion flows into the inverter 11 through the first bypass pipe 220, and flows out of the inverter 11 through the second bypass pipe 221, and further flows into the return pipe 212.

Referring to fig. 4, 7, 10 and 13, when the difference between the current water inlet temperature of the water inlet side 210 and the current ambient temperature is greater than or equal to the third preset temperature, both the compressor 14 and the inverter 11 are powered off, and the circulation of the refrigerant is interrupted. A part of the cooling water at this time flows into the wind side heat exchanger 40 from the third inlet 41 through the water inlet pipe 211 and flows out of the wind side heat exchanger 40 from the third outlet 42, then flows into the electric three-way valve 23 from the second valve port 231 through the water return pipe 212 and further flows into the evaporator 30 through the connection pipe 24; a portion flows into the inverter 11 through the first bypass pipe 220, and flows out of the inverter 11 through the second bypass pipe 221, and further flows into the return pipe 212.

The flow directions of the refrigerant and the cooling water are shown in the form of arrows in the drawings, but this is merely an illustration for easy understanding and is not to be construed as limiting the embodiments of the present invention.

In the description of the present specification, reference to the terms "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for controlling an air conditioner, characterized in that the air conditioner comprises a refrigerant refrigerating assembly and a water cooling assembly, the refrigerant refrigerating assembly comprises a frequency converter, an economizer and a refrigerant pipe, the refrigerant pipe is connected with the economizer and passes through the frequency converter, the water cooling assembly comprises a main water pipe and a bypass pipe connected with the main water pipe, the main water pipe is provided with a water inlet side, and the bypass pipe passes through the frequency converter; the control method comprises the following steps:

2. The control method according to claim 1, wherein the inverter includes a first inlet, a second inlet, a first outlet, and a second outlet, the refrigerant pipe includes a first pipe section, a second pipe section, and a third pipe section, one end of the first pipe section is connected to the first inlet, the other end of the first pipe section is connected to the economizer, the second pipe section is connected in parallel with the third pipe section, and both of the second pipe section and the third pipe section are connected to the first outlet; the bypass pipe comprises a first bypass pipe and a second bypass pipe, the first bypass pipe is connected with a second inlet of the frequency converter, the second bypass pipe is connected with a second outlet of the frequency converter, and the control method comprises the following steps:

3. The control method according to claim 2, wherein a first solenoid valve is provided on the first bypass pipe, and the first solenoid valve is used for controlling on-off of the first bypass pipe, and the control method comprises:

4. The control method according to claim 2, wherein a second electromagnetic valve is provided on the second pipe section, the second electromagnetic valve is used for controlling on-off of the second pipe section, a first electronic expansion valve is provided on the third pipe section, the first electronic expansion valve is used for controlling flow rate of refrigerant in the third pipe section, and the control method comprises:

5. The control method according to claim 2, characterized in that the control method includes:

6. The control method according to claim 2, wherein the refrigerant pipe includes a fourth pipe section, the fourth pipe section is connected to the second pipe section and the third pipe section, a second electromagnetic valve is provided on the second pipe section, the second electromagnetic valve is used for controlling on-off of the second pipe section, a first electronic expansion valve is provided on the third pipe section, the first electronic expansion valve is used for controlling flow rate of refrigerant in the third pipe section, the refrigerant refrigeration assembly further includes a second electronic expansion valve and an evaporator, one end of the second electronic expansion valve is connected to the economizer, and the other end of the second electronic expansion valve is connected to the evaporator through the fourth pipe section, the control method includes:

7. The control method according to claim 1, wherein the refrigerant cooling module includes an evaporator and a wind side heat exchanger, the water cooling module includes an electric three-way valve including a first valve port and a second valve port, and a connection pipe connected to the electric three-way valve, the electric three-way valve is connected to the evaporator through the connection pipe, the wind side heat exchanger includes a third inlet and a third outlet, the main water pipe includes a water inlet pipe and a water return pipe, one end of the water inlet pipe is connected to the first valve port, the other end of the water inlet pipe is connected to the third inlet, one end of the water return pipe is connected to the second valve port, and the other end of the water return pipe is connected to the third outlet, the control method comprising:

8. The control method according to claim 7, wherein the wind side heat exchanger includes a fourth inlet and a fourth outlet, the fourth outlet being connected to the economizer, the refrigerant cooling assembly further includes a compressor, one end of the compressor is connected to the evaporator, and the other end of the compressor is connected to the fourth inlet, the control method comprising:

9. The control method according to claim 8, wherein the compressor includes a gas-supplementing port, the economizer includes a fifth inlet, a fifth outlet, and a sixth outlet, the refrigerant pipe includes a fifth pipe section connecting the sixth outlet and the compressor, the refrigerant cooling assembly includes a third electronic expansion valve and a third solenoid valve, one end of the third electronic expansion valve is connected to the fifth outlet, the other end of the third electronic expansion valve is connected to the fifth inlet, one end of the third solenoid valve is connected to the sixth outlet, and the other end of the third solenoid valve is connected to the gas-supplementing port, the control method comprising:

10. An air conditioner, characterized in that the air conditioner comprises a memory for storing a computer program and a controller for executing the computer program to realize the control method according to any one of claims 1 to 9.