CN115264653A

CN115264653A - Air conditioning system

Info

Publication number: CN115264653A
Application number: CN202210854404.1A
Authority: CN
Inventors: 李庆辉; 宁明辉; 王振
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2022-07-20
Filing date: 2022-07-20
Publication date: 2022-11-01

Abstract

The invention discloses an air conditioning system, which comprises an outdoor unit, an indoor unit and a heat dissipation unit; the heat dissipation unit includes: the indoor unit comprises a heat exchange box body, a heating module and a refrigerant coil, wherein the heat exchange box body is internally provided with the refrigerant coil and the heating module; the heat exchange module is attached to the outer side of the electric cabinet of the outdoor unit, and an internal pipeline is communicated with the heat exchange box body; the pump body is arranged on a water path between the heat exchange box body and the heat exchange module; the processing unit is configured to control the rotating speed of the pump body based on a first temperature in the electric cabinet and a second temperature of a medium in the heat exchange box body during refrigerating operation; when the environment temperature reaches the lower limit value of the preset environment temperature during heating operation, the heat exchange module preheats the electric cabinet, and the air-conditioning system performs heating operation. The invention can reliably dissipate heat and recover energy of the electric control box in the outdoor unit and ensure the reliable operation of the electric control box at ultralow environmental temperature.

Description

Air conditioning system

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioning system.

Background

At present, the electric control heat dissipation solutions in the air conditioning industry mainly include the following solutions: the air cooling heat dissipation of the outdoor fan, the heat dissipation of the refrigerant heat dissipation module and the heat dissipation of the electric cabinet installation fan are realized.

Aiming at the air cooling heat dissipation scheme of the outdoor fan, the work limitation is carried out in a high-temperature heating working interval, the reason is that in the working interval, the outdoor fan is stopped or controlled at a low rotating speed, the heat dissipation effect of the electric cabinet is poor, and the running range of the compressor is limited.

Aiming at the cooling scheme of the cooling medium cooling module, the cooling medium heat exchange in the air conditioning system is utilized to realize the heat dissipation of the electric cabinet, so that the refrigeration load and the energy consumption are increased, and the manufacturing cost of the cooling medium cooling module is relatively high. If the refrigerant heat dissipation module adopts the internal design of the electric cabinet, the problem of condensation easily occurs to the components inside the electric cabinet, and the risk of electric component damage is increased. When the system is in a low-load high-temperature refrigeration state, the refrigerant circulation volume is small, the refrigerant heat dissipation effect is poor, the operation range of the compressor is limited, and when the system is in a refrigerant shortage state or the refrigerant circulation volume is small, condensation is easy to occur on the refrigerant heat dissipation module, and the problems that electric components are damaged and the like also occur.

Aiming at the electric cabinet installation fan heat dissipation scheme, not only is the installation cost increased and the reliability cannot be guaranteed, but also the general heat dissipation fan adopts external installation, and due to the fact that the general heat dissipation fan is in an open type working environment, the situations of dust accumulation, rain, corrosion damage and the like of parts easily occur.

In view of the above heat dissipation schemes, it is necessary to provide a reliable and efficient heat dissipation scheme so as to ensure the normal and reliable operation of the electric cabinet of the air conditioning system.

Disclosure of Invention

In order to solve the above technical problems, embodiments of the present invention provide an air conditioning system for reliably dissipating heat from an electric cabinet in an outdoor unit, recovering energy, and ensuring reliable operation of the electric cabinet at an ultra-low ambient temperature.

The invention is realized by adopting the following technical scheme:

the application relates to an air conditioning system, which comprises an outdoor unit, an indoor unit and a heat dissipation unit; wherein the outdoor unit and the indoor unit form a conventional air conditioning system for conditioning indoor air.

In order to dissipate heat of an electric cabinet in the outdoor unit, the heat dissipation unit is arranged and comprises a heat exchange box body, a heat exchange module, a pump body and a processing unit.

A refrigerant coil and a heating module are arranged in the heat exchange box body, the refrigerant coil is connected with the indoor unit in parallel, and the heat exchange box body is used for exchanging heat between energy in the refrigerant coil in the heat exchange box body and media in the heat exchange box body.

The heat exchange module is attached to the outer side of an electric cabinet of the outdoor unit, an internal pipeline is communicated with the heat exchange box body, and the heat exchange module is used for carrying out heat exchange by utilizing energy in the heat exchange box body and energy of the electric cabinet to realize heat dissipation of the electric cabinet.

And a pump body is also arranged on the water path between the heat exchange box body and the heat exchange module and used for providing power for the medium in the water path.

The processing unit is configured to control the rotating speed of the pump body based on the first temperature in the electric cabinet and the second temperature of the medium in the heat exchange box during refrigerating operation, and the rotating speed of the pump body can also influence the heat exchange speed of the heat exchange module and the electric cabinet.

Under the ultralow ring temperature, in order to avoid the problem that the electrical components in the electric cabinet can produce the trouble because the ring temperature is low, before the operation of heating, heat exchange module preheats the electric cabinet.

In some embodiments of the present application, the rotation speed of the pump body is controlled by comparing the first temperature with the second temperature, the higher the rotation speed of the pump body is, the higher the heat exchange efficiency is, and when the first temperature reaches the lower limit value of the first preset value, the pump body stops;

and when the first temperature reaches the upper limit value of the first preset value, controlling the rotating speed of the pump body based on the first temperature and the second temperature.

In some embodiments of the present application, when the first temperature reaches the upper limit value of the first preset value, based on the first temperature and the second temperature, the rotation speed of the pump body is controlled, specifically:

when the difference between the second temperature and the first temperature reaches the lower limit value of a second preset value, controlling the rotating speed of the pump body according to the temperature section to which the first temperature belongs;

when the difference between the second temperature and the first temperature reaches the upper limit value of a third preset value, the pump body stops;

when the difference between the second temperature and the first temperature reaches the upper limit value of a second preset value and reaches the lower limit value of a third preset value, controlling the rotating speed of the body according to the temperature section to which the first temperature belongs;

wherein, the temperature section increases, then the rotational speed of the pump body corresponding to the temperature section also increases.

In some embodiments of the present application, when the loop temperature reaches the lower limit of the preset loop temperature during heating operation, the heat exchange module preheats the electric cabinet, specifically:

and when the environment temperature reaches the lower limit value of the preset environment temperature during heating operation, judging whether the second temperature reaches the upper limit value of a fourth preset value, if so, controlling the pump body to operate, otherwise, starting the heating module, and closing the heating module until the second temperature reaches the upper limit value of the fourth preset value.

In some embodiments of the present application, when the second temperature reaches the upper limit of the fourth preset value, the pump body is first operated at a low speed, and then it is determined whether the first temperature reaches the upper limit of the fifth preset value, if so, the pump body is maintained to be operated at the low speed for a period of time and then stopped, otherwise, the pump body is operated at the high speed until the first temperature reaches the upper limit of the fifth preset value.

In some embodiments of this application, the structure of design heat exchange module improves heat exchange efficiency, and wherein heat exchange module includes:

a first side wall of the heat exchange cavity is tightly attached to the electric cabinet, a plurality of partition plates are arranged in the heat exchange cavity, and a flow channel is formed between every two adjacent partition plates;

and the inlet and the outlet are communicated with the heat exchange cavity and the heat exchange box body through pipelines.

In some embodiments of the application, set up to V type runner, improve heat exchange module heat transfer area, adjacent baffle slope staggered arrangement in a plurality of baffles, the one end of every baffle supports and leans on first lateral wall, and the other end support lean on extremely the heat exchange cavity with the second lateral wall that first lateral wall is relative.

In some embodiments of the present application, in order to better realize the heat transfer between heat transfer cavity and the electric cabinet, scribble heat conduction silica gel between the first lateral wall of heat transfer cavity and the part that the electric cabinet is hugged closely.

In some embodiments of the present application, the air conditioning system further comprises an oil separator and a gas-liquid separator;

the oil separator is provided with an oil return outlet;

the gas-liquid separator is provided with a gas-liquid separation inlet, the gas-liquid separation inlet is communicated with the oil return outlet, and an oil return capillary tube is arranged on a pipeline communicated between the oil return outlet and the gas-liquid separation inlet; or

An oil return capillary tube and a first filter are arranged in series on a pipeline communicated between the oil return outlet and the gas distribution inlet.

In some embodiments of the present application, to avoid freezing of the heat dissipating unit, the processing unit is further configured to:

and when the temperature of a medium in a pipeline between the heat exchange box body and the heat exchange module reaches the lower limit value of a sixth preset value, the pump body operates at a low speed for a plurality of times.

The application provides an air conditioning system has following advantage and beneficial effect:

(1) The heat exchange of the electric cabinet can be realized through the heat dissipation unit, so that the heat dissipation of the electric cabinet is ensured;

(2) Heat is exchanged to a medium in the heat exchange box body for energy recovery, so that energy waste is avoided;

(3) When the environment temperature reaches the lower limit value of the preset environment temperature, namely when the environment temperature is in an ultralow environment temperature, the influence of ultralow temperature on electrical components in the electric cabinet is avoided, the heat exchange module can preheat the electric cabinet in advance, and then the air conditioning system operates in a heating mode, so that the working reliability of the air conditioning system is ensured. Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of an embodiment of an air conditioning system according to the present invention;

fig. 2 is a partial structure diagram of an outdoor unit in an embodiment of an air conditioning system according to the present invention;

FIG. 3 is a schematic view of an embodiment of a heat exchange module of an air conditioning system according to the present invention;

FIG. 4 is a front view of a heat exchange module in an embodiment of an air conditioning system according to the present invention;

FIG. 5 isbase:Sub>A cross-sectional view taken along the line A-A in FIG. 4;

FIG. 6 is a cross-sectional view taken along the line B-B in FIG. 4;

fig. 7 is a first flowchart of the air conditioning system according to an embodiment of the present invention during cooling operation;

FIG. 8 is a second flowchart illustrating a cooling operation of an embodiment of an air conditioning system according to the present invention;

FIG. 9 is a first flowchart illustrating a heating operation of an embodiment of an air conditioning system according to the present invention;

fig. 10 is a second flowchart of the heating operation of the embodiment of the air conditioning system according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

[ basic operation principle of air conditioner ]

The air conditioner performs a cooling and heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The cooling and heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

The low-temperature and low-pressure refrigerant enters the compressor, the compressor compresses the refrigerant gas in a high-temperature and high-pressure state, and the compressed refrigerant gas is discharged. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigerating effect by heat exchange with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.

The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor, an outdoor heat exchanger, and an outdoor fan, the indoor unit of the air conditioner includes portions of an indoor heat exchanger and an indoor fan, and a throttling device (such as a capillary tube or an electronic expansion valve) may be provided in the indoor unit or the outdoor unit.

The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. The air conditioner performs a heating mode when the indoor heat exchanger serves as a condenser, and performs a cooling mode when the indoor heat exchanger serves as an evaporator.

The indoor heat exchanger and the outdoor heat exchanger are switched to be used as a condenser or an evaporator, a four-way valve is generally adopted, and specific reference is made to the arrangement of a conventional air conditioner, which is not described herein again.

The refrigeration working principle of the air conditioner is as follows: the compressor works to enable the interior of the indoor heat exchanger (in the indoor unit, the evaporator at the moment) to be in an ultralow pressure state, liquid refrigerant in the indoor heat exchanger is rapidly evaporated to absorb heat, air blown out by the indoor fan is cooled by the coil pipe of the indoor heat exchanger to become cold air which is blown into a room, the evaporated and vaporized refrigerant is compressed by the compressor, is condensed into liquid in a high-pressure environment in the outdoor heat exchanger (in the outdoor unit, the condenser at the moment) to release heat, and the heat is dissipated into the atmosphere through the outdoor fan, so that the refrigeration effect is achieved by circulation.

The heating working principle of the air conditioner is as follows: the gaseous refrigerant is pressurized by the compressor to become high-temperature and high-pressure gas, and the high-temperature and high-pressure gas enters the indoor heat exchanger (the condenser at the moment), is condensed, liquefied and released heat to become liquid, and simultaneously heats indoor air, so that the aim of increasing the indoor temperature is fulfilled. The liquid refrigerant is decompressed by the throttling device, enters the outdoor heat exchanger (an evaporator at the moment), is evaporated, gasified and absorbs heat to form gas, absorbs heat of outdoor air (the outdoor air becomes cooler) to form gaseous refrigerant, and enters the compressor again to start the next cycle.

[ air-conditioning System ]

Referring to fig. 1, the air conditioning system of the present application includes an outdoor unit 10, an indoor unit 20, and a heat radiating unit 30.

The outdoor unit 10 is an outdoor unit as described above, and includes a compressor 11, an outdoor heat exchanger 12, an outdoor fan 13, and an outdoor expansion valve 15.

The indoor unit 20 is an indoor unit as described above, and includes an indoor heat exchanger 21 and an indoor expansion valve 22.

By switching the four-way valve 14, the refrigerant flow path is switched, and the heating mode and the cooling mode of the air conditioning system are switched.

The outdoor unit 10 and the indoor unit 20 are communicated with each other through a duct to perform indoor air conditioning.

The electric components in the electric control box of the outdoor unit 10 generate heat when the air conditioning system operates, and if the air conditioning system operates in the cooling mode, the outdoor heat exchanger 12 in the outdoor unit also acts as a condenser and releases heat outwards, so that the heat of the whole outdoor unit 10 is large, and if the heat dissipation is insufficient, the operational reliability of the electric components in the electric control box is affected.

The present application relates to a heat dissipation unit 30, and is mainly intended to perform heat recovery while dissipating heat from an electric cabinet of an outdoor unit 10 when an air conditioning system is cooling, thereby avoiding energy waste.

Referring to fig. 1, the heat dissipating unit 30 includes a heat exchanging case 31, a condensing coil 32, a heat exchanging module 33, and a pump body 34.

The condensing coil 32 is located in the heat exchange box 31, connected in parallel with the indoor unit 20, and is respectively communicated with the outdoor unit 10 and the indoor unit 20 through a pipeline.

A switching device 35 is provided in a line connected in parallel to the indoor unit 20 and connected in series to the condenser coil 32, and the electronic expansion valve EVW is selectable by the switching device 35.

Referring to fig. 2, a partial structure of the outdoor unit 10 is shown, in which an electric cabinet E of the outdoor unit 10 is shown, and a space P at a lower portion of the outdoor unit 10 is used for storing other components (e.g., the compressor 11, the outdoor heat exchanger 12, and pipes thereof, etc.) in the outdoor unit 10.

Referring to fig. 3, a schematic view of the heat exchange module 33 installed at the electric cabinet E is shown.

Heat exchange module 33 can paste through the screw and establish the back at electric cabinet E, and in order to guarantee contact stability and high heat conductivity between the two, scribble heat conduction silica gel between both contact surfaces.

In addition, the heat exchange module 33 is made of a material with a high heat conductivity coefficient, so that heat exchange with the electric cabinet E is ensured, and heat dissipation of the electric cabinet E is facilitated.

Still referring to fig. 1, the medium inside the heat exchange box 31 is typically water, and a temperature sensor (not shown) for detecting the temperature of the medium (referred to as a second temperature Tp) is provided inside, and a heating module (not shown) is also provided, which is typically an electric heating module (e.g., an electric heating wire).

The internal piping of the heat exchange module 33 communicates with the heat exchange tank 31, and thus, the heat exchange module 33 has an inlet C and an outlet D.

Referring to fig. 4 to 6, the heat exchange module 33 includes a heat exchange cavity 331, an inlet C, and an outlet D.

The first side wall of the heat exchange cavity 331 is attached to the back of the electric cabinet E, and heat-conducting silica gel is coated between the first side wall and the back.

In order to increase the medium flow area in the heat exchange cavity 331, a plurality of partition plates 334 are disposed in the heat exchange cavity 331, flow channels are formed between adjacent partition plates 334, and each partition plate 334 may be disposed in parallel, may be disposed obliquely, and the like.

Referring to fig. 4 to 6, the heat exchange cavity 331 is a square body having four side walls (including a front side wall, a rear side wall, a left side wall, a right side wall, a top side wall and a bottom side wall), and the contact area between the square side wall (for example, the rear side wall) and the back surface of the electric cabinet E is the largest, so that the heat exchange effect is ensured.

Referring to fig. 5 and 6, adjacent partitions among the partitions 334 in the heat exchange cavity 331 are arranged in an inclined staggered manner, and one end of each partition 334 abuts against one side wall (for example, the front side wall) and the other end abuts against the other side wall (for example, the rear side wall), so that a plurality of V-shaped flow channels are formed in the heat exchange cavity 331, and the heat exchange area is increased.

A first mouthpiece 332 and a second mouthpiece 333 which are communicated with the heat exchange cavity 331 are respectively arranged on the left side wall and the right side wall.

The first interface tube 332 and the second interface tube 333 form an inlet C and an outlet D, respectively, which are communicated with the heat exchange tank 31.

First interface tube 332 and second interface tube 333 may be threadably coupled to heat exchange cavity 331.

As follows, heat dissipation and preheating of the electric cabinet E by the heat dissipation unit 30 in the cooling mode and the heating mode of the air conditioning system, respectively, will be described.

Referring to fig. 7 and 8, heat dissipation of the electric cabinet E by the heat dissipation unit 30 in the cooling mode of the air conditioning system will be described.

Before control, a temperature sensor is needed to detect the temperature (recorded as a first temperature Tfin) in the electric cabinet E.

S1: and judging whether the Tfin is smaller than the T1, if so, going to S2, and otherwise, going to S3.

Where T1 is a preset value shown as an example.

When the first temperature Tfin reaches the lower limit value of the first preset value, that is, tfin is less than or equal to T1, S2 is also performed.

The first preset value may be a temperature interval or a certain temperature, for example T1.

S2: the pump body stops.

When Tfin is smaller than T1, it indicates that the current temperature in the electric cabinet is not high, and the electric cabinet may not be cooled by the cooling unit 30.

S3: based on the first temperature Tfin and the second temperature Tp, the rotational speed of the pump body is controlled.

The rotating speed of the pump body 34 is determined by the heat exchange speed between the heat exchange module 33 and the electric cabinet E, and therefore, when Tfin is relatively high, the rotating speed of the pump body 34 should be increased.

The rotation speed of the pump body 34 is specifically controlled based on both the energy saving and heat radiation effects, see fig. 8.

Referring to fig. 8, a flowchart for controlling the rotational speed of the pump body 34 based on the first temperature Tfin and the second temperature Tp is shown.

S31: and judging whether the temperature difference delta T between the second temperature Tp and the first temperature Tfin is less than-10 ℃, if so, going to S32, and otherwise, going to S37.

Where-10 c is also the preset value shown as an example.

When the temperature difference Δ T reaches the lower limit value of the second preset value, i.e., Δ T is equal to or less than-10 ℃, it also proceeds to S32.

The second preset value may be a temperature interval or a certain temperature, for example-10 ℃.

When the delta T is less than minus 10 ℃, the temperature in the heat exchange box body 31 is lower than the temperature in the electric cabinet E, so that heat can be dissipated for the electric cabinet E.

At this time, the rotation speed of the pump body 34 is controlled according to the second temperature Tfin in the electric cabinet E.

The temperature in the characterization electric cabinet E can be divided into a plurality of temperature sections, the temperature section to which the second temperature Tfin fed back actually belongs is judged, and the rotating speed of the pump body 34 is correspondingly controlled based on the principle that the rotating speed of the pump body 34 is increased due to the high Tfin.

The temperature inside the electric cabinet E is divided into three temperature sections as follows.

And S32, judging whether Tfin is smaller than T2, if so, going to S33, and otherwise, going to S34.

Where T2 is a preset value shown as an example.

When Tfin reaches the lower limit value of the seventh preset value, i.e., tfin is equal to or less than T2, the process also proceeds to S33.

The seventh preset value may be a temperature interval or a certain temperature, e.g. T2.

S33: the pump body 34 operates at a low speed.

The low-speed operation guarantees the radiating of electric cabinet E, ensures the low energy consumption of pump body 34 simultaneously.

S34: and judging whether the Tfin is smaller than T3, if so, going to S35, and otherwise, going to S36.

Where T3 is a preset value shown as an example.

When Tfin reaches the lower limit value of the eighth preset value, that is, tfin is equal to or less than T3, the process also proceeds to S35.

The eighth preset value may be a temperature interval or a certain temperature, for example, T3.

S35: the pump body 34 is operated at a medium speed.

The first temperature Tfin increases, which corresponds to the increase in the rotational speed of the pump body 34 from the low speed to the medium speed.

S36: the pump body 34 operates at high speed.

The first temperature Tfin continues to increase, and the rotation speed of the corresponding pump body 34 also increases from the medium speed to the high speed.

It should be noted that the low speed, the medium speed and the high speed of the pump body 34 are relative terms, and the specific rotation speed value thereof can be set according to the requirement.

S37: and judging whether the temperature difference delta T between the second temperature Tp and the first temperature Tfin is greater than 0 ℃, if so, going to S2, and otherwise, going to S38.

Where 0 c is also the preset value shown as an example.

When the temperature difference Δ T reaches the upper limit value of the third preset value, that is, Δ T is equal to or greater than 0 ℃, S2 is also performed.

The third preset value may be a temperature interval or a certain temperature, for example 0 ℃.

When the delta T is higher than 0 ℃, the temperature in the heat exchange box body 31 is higher than the temperature in the electric cabinet E, so that the heat exchange module 33 is not adopted for radiating heat of the electric cabinet E.

The pump body 34 is at a stop.

When the delta T is less than or equal to 0 ℃ and more than or equal to minus 10 ℃, the temperature in the heat exchange box body 31 is slightly lower than the temperature in the electric cabinet E, so that the heat exchange module 33 can be adopted to radiate the heat of the electric cabinet E

The temperature in the characterization electric cabinet E can be divided into a plurality of temperature sections, the temperature section to which the second temperature Tfin fed back actually belongs is judged, and the rotating speed of the pump body 34 is correspondingly controlled based on the principle that the rotating speed of the pump body 34 is increased by the Tfin height.

The temperature inside the electric cabinet E is divided into two temperature sections as follows.

And S38, judging whether Tfin is smaller than T2, if so, going to S39, and otherwise, going to S39'.

Where T2 is a preset value shown as an example.

When Tfin reaches the lower limit value of the ninth preset value, i.e., tfin is equal to or less than T2, the process also proceeds to S39.

The ninth preset value may be a temperature interval or a certain temperature, for example T2.

S39: the pump body 34 is operated at a medium speed.

The pump body 34 runs at a medium speed, so that the heat dissipation of the electric cabinet E is ensured, and simultaneously, the low energy consumption of the pump body 34 is ensured.

And S39': the pump body 34 operates at high speed.

The electric cabinet E is cooled through the heat exchange module 33, heat of the electric cabinet E is exchanged to the heat exchange module 33, and energy recovery is achieved.

Referring to fig. 1, a water replenishing pipeline 36 is further disposed on the heat exchange box 31 for replenishing water in the heat exchange box 31, and a water outlet pipeline (not shown) may also be disposed on the heat exchange box 31 for discharging hot water in the heat exchange box 31 for use.

Through controlling as above, can realize when air conditioning system operation refrigeration mode, adopt heat exchange module 34 to dispel the heat to electric cabinet E, and can retrieve the heat simultaneously.

Referring to fig. 9, it shows a flow chart of the air conditioning system in the heating mode when the heat exchange box 31 has a heating demand.

S1': when it is detected that the ring temperature is greater than the set value (for example, -25 ℃), if the heat exchange tank 31 also has a heating demand, it proceeds to S2'.

After the air conditioning mode is performed in the heating mode, the heating requirement of the heat exchange box 31 can be met.

When the environment temperature is not lower than a set value, the heating of the heat exchange box body 31 is realized, and the main purpose is that the heat exchange box body 31 stores heat for later use, so that the heat exchange module 33 preheats the electric cabinet E when the environment temperature is lower than-25 ℃.

S2': EVW is fully on.

When the EVW is fully opened, a part of the high-temperature and high-pressure gas pressurized by the compressor 11 enters the refrigerant coil 32 to exchange heat with water in the heat exchange box 31, and the temperature of the water is increased.

S3': and judging whether the second temperature Tp is more than 15 ℃, if so, proceeding to S4', otherwise, returning to S3'.

Where 15 deg.c is a preset value shown as an example.

When Tp reaches the upper limit value of the tenth preset value, that is, tp is 15 ℃ or higher, S4' is also proceeded to.

The tenth preset value may be a temperature interval or a certain temperature, e.g. 15 ℃.

S4': the EVW is turned off.

When the air conditioning system heats the mode operation, the heat exchange water tank 31 can be heated, so that the indoor heating of a user can be realized, and meanwhile, the user side is provided with hot water for use through the water outlet pipeline arranged on the heat exchange tank body 31, and the life of the user is facilitated.

Referring to fig. 10, it shows a flow chart of the heat exchange module 33 preheating the electric cabinet E.

S1': and when the detected environment temperature is less than or equal to minus 25 ℃, if the air conditioning system has a heating requirement, the step goes to S2''.

Where-25 deg.c is a preset value shown as an example.

When the environment temperature reaches the lower limit value of the preset environment temperature, namely, the environment temperature is less than minus 25 ℃, if the air conditioning system has a heating requirement, the S2'' is also carried out.

The preset ring temperature may be a temperature interval or a certain temperature, for example-25 ℃.

And when the ring temperature reaches the lower limit value of the preset ring temperature, indicating that the current ring temperature is the ultralow ring temperature condition.

In some embodiments of the present application, a ring temperature of-25 ℃ or less indicates that the current ring temperature is an ultra-low ring temperature condition.

In the case of an ultra-low ambient temperature, if the electrical components in the electric cabinet E are suddenly turned on, the internal electrical components may be damaged, and thus, before the air conditioning system is in the heating mode, the operational reliability of the electric cabinet E needs to be ensured.

S2': judging whether the first temperature Tfin is less than the ring temperature, if so, proceeding to S4'', otherwise, proceeding to S3''.

Whether the electric cabinet E needs to be preheated is judged by judging the first temperature Tfin in the electric cabinet E.

S3': the air conditioning system starts a heating mode.

S4': judging whether the second temperature Tp is greater than 15 ℃, if so, proceeding to S5'', otherwise, proceeding to S6''.

Before the electric cabinet E is preheated by the heat exchange module 33, the temperature Tp of the medium in the heat exchange cabinet 31 needs to be ensured, that is, it is determined whether Tp is greater than 15 ℃.

Where 15 deg.c is a preset value shown as an example.

When Tp reaches the upper limit value of the fourth preset value, i.e., tp is equal to or greater than 15 ℃, S5 ″ is also performed.

The fourth preset value may be a temperature interval or a certain temperature, for example 15 ℃.

S5': the pump body 34 operates at a low speed.

The pump body 34 runs at a low speed, and the energy consumption of the pump body 34 is saved while the electric cabinet E is preheated.

S6': the heating module is operated and returns to the straight S4 ″ after a certain time (for example five minutes).

The heating module works to heat the medium in the heat exchange box body E, and the first temperature Tp is detected at intervals of a plurality of times until the Tp is larger than 15 ℃, and the heating module is closed.

S7': judging whether Tfin is larger than-20 ℃, if yes, proceeding to S8'', otherwise, proceeding to S9''.

Where-20 c is a preset value shown as an example.

When Tfin reaches the upper limit of the fifth predetermined value, i.e., tfin is greater than or equal to-20 ℃, S8 ″ is also performed.

The fifth preset value may be a temperature interval or a certain temperature, for example-20 ℃.

S8': the pump body 34 is stopped after maintaining the low speed operation for a plurality of times.

When Tfin is higher than-20 ℃, the electric cabinet E is started, so that damage to electric components in the electric cabinet E can be avoided.

Thus, to save energy, the pump 34 is stopped after running at low speed for some time (e.g., five minutes).

S9': the pump body 34 runs at high speed and returns to S7 ″ after a certain time (e.g., five minutes).

The pump body 34 runs at a high speed, heat exchange between the heat exchange module 33 and the electric cabinet E is accelerated, the electric cabinet E is preheated more efficiently, and the first temperature Tfin in the electric cabinet E is higher than-20 ℃.

The electric cabinet E can be preheated under the ultralow temperature condition through the control, the working reliability of electric components of the electric cabinet E before starting is improved, and therefore the use reliability of the air-conditioning system is improved.

In addition, in order to prevent freezing of the medium in the pipe between the heat exchange water tank 31 and the heat exchange module 33 in the heat radiating unit 30, a temperature sensor (not shown) for detecting a temperature Tw of the medium in the pipe is provided.

At Tw less than 1 deg.C, the pump 34 is run at low speed for a period of time (e.g., three minutes).

Where 1 deg.c is a preset value shown as an example.

When Tw reaches the lower limit of the sixth preset value, i.e., tw is 10 ℃ or less, the pump body 34 is also operated at a low speed for a certain period of time.

The sixth preset value may be a temperature interval or a certain temperature, for example 1 ℃.

Referring to fig. 1, the air conditioning system of the present application further comprises an oil separator 16 and a gas-liquid separator 17, wherein: the compressor 11 communicates with an oil separator 16 and a gas-liquid separator 18, respectively, and the oil separator 16 and the gas-liquid separator 17 communicate with the indoor side.

In the air conditioning system, the refrigerant oil is used to lubricate and cool the cylinder of the compressor 11.

The compressor 11 is provided with a refrigerant outlet and a refrigerant inlet respectively communicated with the compressor cylinder.

The compressor 11 is configured to suck a gaseous refrigerant from a refrigerant input port, compress and liquefy the gaseous refrigerant, output a liquid refrigerant to an indoor unit side (not shown) through a refrigerant output port via a pipeline, vaporize the liquid refrigerant in a coil of the indoor unit side to absorb heat, and return the liquid refrigerant to the compressor 11 to complete the whole cycle process.

The liquid refrigerant discharged from the refrigerant discharge port of the compressor 11 first enters the oil separator 16.

The oil separator 16 has an oil inlet, an oil return outlet a' and an oil outlet.

After the liquid refrigerant enters the oil separator 16 from the oil inlet, the refrigeration oil mixed in the refrigerant is separated from the refrigerant, and then is output to the gas-liquid separator 17 from the oil return outlet a'.

The gas-liquid separator 17 is provided with a gas-separation inlet B 'and a gas-separation outlet, the gas-separation inlet B' is communicated with the four-way valve 90, and the gas-separation outlet is communicated with the refrigerant input port.

The gas inlet B 'is communicated with the oil return outlet A' through a pipeline.

Referring to fig. 1, an oil return capillary tube 18 may be provided on the pipeline, and an oil return capillary tube 18 and a filter (not shown) may be connected in series on the pipeline, so that the refrigeration oil output from the oil return outlet a 'enters the air inlet B' through the oil return capillary tube 18 or both the oil return capillary tube 18 and the filter, thereby ensuring oil return.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding claims.

Claims

1. An air conditioning system comprises an outdoor unit and an indoor unit, and is characterized by also comprising a heat dissipation unit; the heat dissipation unit includes:

the indoor unit comprises a heat exchange box body, a heating module and a cooling medium coil pipe, wherein the heat exchange box body is internally provided with the cooling medium coil pipe and the heating module;

the heat exchange module is attached to the outer side of the electric cabinet of the outdoor unit, and an internal pipeline is communicated with the heat exchange box body;

the pump body is arranged on a water path between the heat exchange box body and the heat exchange module;

the processing unit is configured to control the rotating speed of the pump body based on a first temperature in the electric cabinet and a second temperature of a medium in the heat exchange box during refrigerating operation;

when the environment temperature reaches the lower limit value of the preset environment temperature during heating operation, the heat exchange module preheats the electric cabinet, and the air-conditioning system performs heating operation.

2. The air conditioning system of claim 1,

when the first temperature reaches the lower limit value of the first preset value, the pump body stops;

3. The air conditioning system of claim 2,

when the first temperature reaches the upper limit value of the first preset value, the rotating speed of the pump body is controlled based on the first temperature and the second temperature, and the control method specifically comprises the following steps:

4. The air conditioning system of claim 1,

when the environment temperature reaches the lower limit value of the preset environment temperature during heating operation, the heat exchange module preheats the electric cabinet, and specifically comprises the following steps:

5. The air conditioning system of claim 4,

when the second temperature reaches the upper limit value of the fourth preset value, the pump body is operated at a low speed, whether the first temperature reaches the upper limit value of the fifth preset value or not is judged, if yes, the pump body is kept operated at the low speed for a period of time and then is stopped, and if not, the pump body is operated at a high speed until the first temperature reaches the upper limit value of the fifth preset value.

6. The air conditioning system of claim 1, wherein the heat exchange module comprises:

7. The air conditioning system as claimed in claim 6, wherein adjacent partitions of the plurality of partitions are arranged in an inclined staggered manner, and one end of each partition abuts against the first side wall and the other end abuts against a second side wall of the heat exchange cavity opposite to the first side wall.

8. The air conditioning system of claim 6, wherein a portion between the first side wall of the heat exchange cavity and the portion of the electric cabinet tightly attached to the heat exchange cavity is coated with heat conductive silica gel.

9. The air conditioning system of claim 1, further comprising an oil separator and a gas-liquid separator;

the oil separator is provided with an oil return outlet;

the gas-liquid separator is provided with a gas-liquid separation inlet, the gas-liquid separation inlet is communicated with the oil return outlet, and an oil return capillary tube is arranged on a pipeline communicated between the oil return outlet and the gas-liquid separation inlet; or alternatively

And an oil return capillary tube and a first filter are arranged in series on a pipeline communicated between the oil return outlet and the gas inlet.

10. The air conditioning system of claim 1, wherein the processing unit is further configured to:

and when the temperature of a medium in a pipeline between the heat exchange box body and the heat exchange module reaches a lower limit value of a sixth preset value, the pump body operates at a low speed for a plurality of times.