Air conditioning system

Abstract

The application discloses an air conditioning system, comprising an outdoor unit, an indoor unit and a heat dissipation unit; the heat dissipation unit comprises: a heat exchange box body, which is internally provided with a refrigerant coil pipe and a heating module, and the refrigerant coil pipe is arranged in parallel with the indoor unit; a heat exchange module, which is attached to the outside of an electric control box of the outdoor unit and internally communicates with the heat exchange box body; a pump body, which is arranged on a water circuit between the heat exchange box body and the heat exchange module; and a processing unit, which is configured to control the rotating speed of the pump body based on a first temperature in the electric control box and a second temperature of medium in the heat exchange box body when the air conditioning system is in a refrigeration operation; when the air conditioning system is in a heating operation at a lower limit value of a preset ambient temperature, the heat exchange module first preheats the electric control box, and then the air conditioning system is in the heating operation. The application can reliably dissipate heat of the electric control box in the outdoor unit, recover energy and ensure reliable operation of the electric control box at an ultra-low ambient temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning technology, and in particular to an air conditioning system. BACKGROUND

[0002] At present, the heat dissipation solutions of the electric control of the air conditioning industry mainly include the following: air cooling heat dissipation of the outdoor fan, refrigerant heat dissipation module heat dissipation, and electric control box installation fan heat dissipation.

[0003] For the air cooling heat dissipation scheme of the outdoor fan, the working range is limited in the high-temperature heating working range. The reason is that in the above working range, the outdoor fan is stopped or controlled at low speed, which will cause the heat dissipation effect of the electric control box to be poor, and the operating range of the compressor is limited.

[0004] For the refrigerant heat dissipation module heat dissipation scheme, the heat dissipation of the electric control box is realized by using the refrigerant heat exchange in the air conditioning system. This not only increases the refrigeration load and energy consumption, but also has a relatively high manufacturing cost of the refrigerant heat dissipation module. If the refrigerant heat dissipation module is designed inside the electric control box, the components inside the electric control box are prone to condensation problems, which will increase the risk of damage to electrical components. In the case of small load and high temperature refrigeration, the refrigerant circulation amount is small, the refrigerant heat dissipation effect is poor, the operating range of the compressor is limited, and in the case of lack of refrigerant or small refrigerant circulation amount, the refrigerant heat dissipation module itself is prone to condensation, which will also cause problems such as damage to electrical components.

[0005] For the electric control box installation fan heat dissipation scheme, the installation cost is increased and the reliability cannot be guaranteed. Generally, the heat dissipation fan is installed externally. Since it is in an open working environment, it is prone to problems such as dust accumulation, rain, corrosion and damage of components.

[0006] In view of the above heat dissipation schemes, a reliable and efficient heat dissipation scheme needs to be provided to ensure the normal and reliable operation of the electric control box of the air conditioning system. SUMMARY

[0007] In order to solve the above technical problems, the embodiments of the present application provide an air conditioning system for reliable heat dissipation, energy recovery and reliable operation of the electric control box in the outdoor unit under ultra-low ambient temperature.

[0008] The present application is implemented by adopting the following technical solutions:

[0009] The present application relates to an air conditioning system, which comprises an outdoor unit, an indoor unit and a heat dissipation unit. The outdoor unit and the indoor unit form a traditional air conditioning system for adjusting indoor air.

[0010] In order to dissipate heat from the electric control box in the outdoor unit, a heat dissipation unit is provided, which comprises a heat exchange box, a heat exchange module, a pump body and a processing unit.

[0011] The heat exchange box is provided with a refrigerant coil and a heating module. The refrigerant coil is connected in parallel with the indoor unit, and is used for heat exchange between the refrigerant coil and the medium in the heat exchange box when the heat exchange box is used.

[0012] The heat exchange module is attached to the outside of the electric control box of the outdoor unit, and the internal pipeline is communicated with the heat exchange box, which is used for heat exchange between the energy in the heat exchange box and the energy of the electric control box, so as to realize heat dissipation of the electric control box.

[0013] A pump body is further arranged on the water path between the heat exchange box and the heat exchange module, which is used for providing power to the medium in the pipeline.

[0014] The processing unit is configured to control the rotating speed of the pump body based on the first temperature in the electric control box and the second temperature of the medium in the heat exchange box during refrigeration operation. The rotating speed of the pump body also affects the heat exchange speed of the heat exchange module and the electric control box.

[0015] In order to avoid the problem that the electrical components in the electric control box will fail due to low ambient temperature, the heat exchange module preheats the electric control box before heating operation under ultra-low ambient temperature.

[0016] In some embodiments of the present application, the rotating speed of the pump body is controlled by comparing the first temperature and the second temperature. The higher the rotating speed of the pump body, the higher the heat exchange efficiency. When the first temperature reaches the lower limit value of the first preset value, the pump body stops.

[0017] 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.

[0018] In some embodiments of the present application, 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, specifically:

[0019] When the difference between the second temperature and the first temperature reaches the lower limit value of the second preset value, the rotating speed of the pump body is controlled according to the temperature section to which the first temperature belongs.

[0020] When the difference between the second temperature and the first temperature reaches the upper limit value of the third preset value, the pump body stops.

[0021] When the difference between the second temperature and the first temperature reaches the upper limit value of the second preset value and the lower limit value of the third preset value, the rotating speed of the pump body is controlled according to the temperature section to which the first temperature belongs.

[0022] Wherein, the temperature section increases, and the rotating speed of the pump body corresponding to the temperature section also increases.

[0023] In some embodiments of the present application, when the ring temperature reaches the lower limit value of the preset ring temperature, the heat exchanger module preheats the electric control box, specifically:

[0024] When the ring temperature reaches the lower limit value of the preset ring temperature, it is judged whether the second temperature reaches the upper limit value of the fourth preset value. If yes, the pump body is controlled to operate, otherwise, the heating module is started until the heating module is closed when the second temperature reaches the upper limit value of the fourth preset value.

[0025] In some embodiments of the present application, when the second temperature reaches the upper limit value of the fourth preset value, the pump body first operates at low speed, and then it is judged whether the first temperature reaches the upper limit value of the fifth preset value. If yes, the pump body is maintained at low speed for a period of time and then stopped, otherwise, the pump body is operated at high speed until the first temperature reaches the upper limit value of the fifth preset value.

[0026] In some embodiments of the present application, the structure of the heat exchanger module is designed to improve the heat exchange efficiency, wherein the heat exchanger module comprises:

[0027] A heat exchange cavity closely attached to the electric control box, a plurality of partitions are arranged in the heat exchange cavity, and flow channels are formed between each adjacent partition;

[0028] An inlet and an outlet which are connected to the heat exchange cavity and the heat exchange box through pipelines.

[0029] In some embodiments of the present application, the V-shaped flow channel is arranged to increase the heat exchange area of the heat exchanger module, and the adjacent partitions in the plurality of partitions are arranged in an inclined and staggered manner. One end of each partition abuts against the first side wall, and the other end abuts against the second side wall opposite to the first side wall of the heat exchange cavity.

[0030] In some embodiments of the present application, in order to better realize the heat exchange between the heat exchange cavity and the electric control box, a heat-conducting silica gel is coated between the part of the first side wall of the heat exchange cavity closely attached to the electric control box.

[0031] In some embodiments of the present application, the air conditioning system further comprises an oil separator and a gas-liquid separator;

[0032] The oil separator has an oil separation oil return outlet;

[0033] The gas-liquid separator has a gas separation inlet, the gas separation inlet is communicated with the oil separation oil return outlet, and an oil return capillary is arranged on the pipeline between the oil separation oil return outlet and the gas separation inlet; or

[0034] An oil return capillary and a first filter are arranged in series on the pipeline between the oil separation oil return outlet and the gas separation inlet.

[0035] In some embodiments of the present application, in order to avoid the heat dissipation unit from freezing, the processing unit is further configured to:

[0036] When the temperature of the medium in the pipeline between the heat exchange box and the heat exchange module reaches the lower limit value of the sixth preset value, the pump body operates at a low speed for a certain period of time.

[0037] The air conditioning system provided by the present application has the following advantages and beneficial effects:

[0038] (1) The heat dissipation unit can exchange heat with the electric control box to ensure heat dissipation of the electric control box;

[0039] (2) The heat is exchanged to the medium in the heat exchange box for energy recovery, avoiding energy waste;

[0040] (3) When the heating operation is performed when the ambient temperature reaches the lower limit value of the preset ambient temperature, it is considered to be in an ultra-low ambient temperature, the influence of the ultra-low temperature on the electrical components in the electric control box is avoided, the heat exchange module can preheat the electric control box in advance, and then the air conditioning system is operated in the heating mode, ensuring the working reliability of the air conditioning system. Other features and advantages of the present application will become more apparent after reading the specific embodiments of the present application in combination with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0042] Figure 1 The schematic diagram of an embodiment of the air conditioning system proposed by the present application;

[0043] Figure 2 The partial structure diagram of the outdoor unit in an embodiment of the air conditioning system proposed by the present application;

[0044] Figure 3 The installation schematic diagram of the heat exchange module in an embodiment of the air conditioning system proposed by the present application;

[0045] Figure 4 The front view of the heat exchange module in an embodiment of the air conditioning system proposed by the present application;

[0046] Figure 5 The cross-sectional view along the direction of A-A; Figure 4

[0047] The cross-sectional view along the direction of B-B; Figure 6 Figure 4

[0048] ​​Figure 7 Flowchart of the air conditioning system according to the present application in a cooling operation Figure 1

[0049] Figure 8 Flowchart of the air conditioning system according to the present application in a cooling operation Figure 2

[0050] Figure 9 Flowchart of the air conditioning system according to the present application in a heating operation Figure 1

[0051] Figure 10 Flowchart of the air conditioning system according to the present application in a heating operation Figure 2 DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0053] Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0054] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the description of the above embodiments, the specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0055] The terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.​​​​

[0056] [Basic operating principle of air conditioner]

[0057] An air conditioner performs a refrigeration and heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration and heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0058] A low-temperature and low-pressure refrigerant enters the compressor, which compresses the refrigerant gas into a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0059] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant formed 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 refrigeration effect by exchanging heat with a material to be cooled using the latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0060] The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor, the outdoor heat exchanger, and the outdoor fan, and the indoor unit of the air conditioner includes the part of the indoor heat exchanger and the indoor fan, and a throttling device (such as a capillary or an electronic expansion valve) can be provided in the indoor unit or the outdoor unit.

[0061] The indoor heat exchanger and the outdoor heat exchanger are used as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner performs a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner performs a cooling mode.

[0062] The way in which the indoor heat exchanger and the outdoor heat exchanger are converted as a condenser or an evaporator generally uses a four-way valve, and for details, refer to the settings of a conventional air conditioner, which will not be described here.

[0063] The refrigeration working principle of the air conditioner is that the operation of the compressor makes the indoor heat exchanger (in the indoor unit, which is an evaporator at this time) in an ultra-low pressure state, the liquid refrigerant in the indoor heat exchanger rapidly evaporates and absorbs heat, the wind blown by the indoor fan is cooled after passing through the indoor heat exchanger coil and becomes cold wind to blow into the room, and the evaporated refrigerant is pressurized by the compressor and condensed into a liquid state in the high-pressure environment of the outdoor heat exchanger (in the outdoor unit, which is a condenser at this time), releasing heat, which is dissipated to the atmosphere by the outdoor fan, and thus the refrigeration effect is achieved through the cycle.

[0064] The heating working principle of the air conditioner is that the gaseous refrigerant is pressurized by the compressor to become a high-temperature and high-pressure gas, enters the indoor heat exchanger (at this time, it is a condenser), is condensed and liquefied to release heat, becomes a liquid, and at the same time, heats the indoor air, so as to achieve the purpose of increasing the indoor temperature. The liquid refrigerant is decompressed by the throttling device, enters the outdoor heat exchanger (at this time, it is an evaporator), evaporates and gasifies to absorb heat, becomes a gas, and at the same time, absorbs the heat of the outdoor air (the outdoor air becomes colder), becomes gaseous refrigerant, and enters the compressor again to start the next cycle.

[0065] [air conditioning system]

[0066] Referring to Figure 1 , the air conditioning system of the present application comprises an outdoor unit 10, an indoor unit 20 and a heat dissipation unit 30.

[0067] The outdoor unit 10 refers to the outdoor unit as described above, comprising a compressor 11, an outdoor heat exchanger 12, an outdoor fan 13 and an outdoor side expansion valve 15.

[0068] The indoor unit 20 refers to the indoor unit as described above, comprising an indoor heat exchanger 21 and an indoor side expansion valve 22.

[0069] 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.

[0070] The outdoor unit 10 and the indoor unit 20 are connected by pipelines to realize indoor air conditioning.

[0071] The electrical components in the electrical control box of the outdoor unit 10 generate heat when the air conditioning system is working, and at this time, if the air conditioning system runs in the cooling mode, the outdoor heat exchanger 12 in the outdoor unit acts as a condenser and also releases heat to the outside, so that the entire outdoor unit 10 has a large amount of heat, and at this time, if the heat dissipation is insufficient, the working reliability of the electrical components in the electrical control box will be affected.

[0072] The present application mainly relates to the heat dissipation unit 30, and the main purpose is to dissipate heat from the electrical control box of the outdoor unit 10 while recovering heat when the air conditioning system is cooling, so as to avoid energy waste.

[0073] Referring to Figure 1 , the heat dissipation unit 30 comprises a heat exchange box 31, a condensing coil 32, a heat exchange module 33 and a pump body 34.

[0074] The condensing coil 32 is located in the heat exchange box 31, is connected in parallel with the indoor unit 20, and is connected by pipelines with the outdoor unit 10 and the indoor unit 20, respectively.

[0075] A switching piece 35 is arranged on the pipeline which is connected in parallel with the indoor unit 20 and in series with the condensing coil 32, and the switching piece 35 can select an electronic expansion valve EVW.

[0076] Referring to Figure 2 , a partial structural view of the outdoor unit 10 is shown, in which an electric control box E of the outdoor unit 10 is shown, and a space P at a lower portion of the outdoor unit 10 is used to store other components (e.g. the compressor 11, the outdoor heat exchanger 12 and its pipelines, etc.) in the outdoor unit 10.

[0077] Referring to Figure 3 , a schematic view showing that the heat exchange module 33 is installed at the electric control box E is shown.

[0078] The heat exchange module 33 can be attached to the back of the electric control box E by screws, and in order to ensure the contact stability and high heat transfer between the two, heat-conducting silica gel is coated between the contact surfaces of the two.

[0079] In addition, the heat exchange module 33 is manufactured by using a material with high thermal conductivity, which ensures the heat exchange between the heat exchange module 33 and the electric control box E, and is beneficial to the heat dissipation of the electric control box E.

[0080] Still referring to Figure 1 , the medium in the heat exchange box 31 is generally water, and a temperature sensor (not shown) for detecting the temperature of the medium (referred to as the second temperature Tp) is arranged inside, and a heating module (not shown) is also provided, which is generally an electric heating module (e.g. an electric heating wire).

[0081] The internal pipeline of the heat exchange module 33 is in communication with the heat exchange box 31, and therefore the heat exchange module 33 has an inlet C and an outlet D.

[0082] Referring to Figures 4 to 6 , the heat exchange module 33 includes a heat exchange cavity 331, the inlet C and the outlet D.

[0083] The first side wall of the heat exchange cavity 331 is attached to the back of the electric control box E, and heat-conducting silica gel is coated between the first side wall and the back.

[0084] In order to increase the medium flow area in the heat exchange cavity 331, a plurality of partitions 334 are arranged in the heat exchange cavity 331, and flow channels are formed between adjacent partitions 334. Each partition 334 can be arranged in parallel, or can be arranged obliquely, etc.

[0085] Referring to Figures 4 to 6 , the heat exchange cavity 331 is a square body with 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 square side wall (e.g. the rear side wall) has the largest contact area with the back of the electric control box E, which ensures the heat exchange effect.

[0086] Referring to Figure 5 and Figure 6The adjacent partitions among the plurality of partitions 334 arranged in the heat exchange cavity 331 are arranged in an inclined staggered manner, each partition 334 is abutted to one side wall (for example, the front side wall) at one end and is abutted to another side wall (for example, the rear side wall) at the other end, so that a plurality of V-shaped flow channels are formed in the heat exchange cavity 331, and the heat exchange area is increased.

[0087] The first interface pipe 332 and the second interface pipe 333 are arranged on the left side wall and the right side wall respectively and are in communication with the heat exchange cavity 331.

[0088] The first interface pipe 332 and the second interface pipe 333 are arranged at the entrance C and the exit D respectively and are in communication with the heat exchange cavity 331.

[0089] The first interface pipe 332 and the second interface pipe 333 can be connected with the heat exchange cavity 331 by screwing.

[0090] As follows, the heat dissipation and preheating of the electric control box E by the heat dissipation unit 30 in the air conditioning system in the cooling mode and the heating mode respectively will be described.

[0091] Referring to Figure 7 and Figure 8 , the heat dissipation of the electric control box E by the heat dissipation unit 30 in the air conditioning system in the cooling mode is described.

[0092] Before the control is performed, the temperature sensor is used to detect the temperature (denoted as the first temperature Tfin) in the electric control box E.

[0093] S1: It is judged whether Tfin is less than T1, if yes, proceed to S2, otherwise, proceed to S3.

[0094] T1 is a preset value shown as an example.

[0095] 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 will also be performed.

[0096] The first preset value can be a temperature interval or a certain temperature, for example, T1.

[0097] S2: The pump body is stopped.

[0098] When Tfin is less than T1, it indicates that the current temperature in the electric control box is not high, and the electric control box can not be cooled by the heat dissipation unit 30.

[0099] S3: The speed of the pump body is controlled based on the first temperature Tfin and the second temperature Tp.

[0100] The speed of the pump body 34 is determined by the heat exchange speed between the heat exchange module 33 and the electric control box E, so when Tfin is relatively high, the speed of the pump body 34 should also be increased correspondingly.

[0101] Based on the effects of energy saving and heat dissipation, the rotating speed of the pump body 34 is controlled specifically, see Figure 8 .

[0102] See Figure 8 , a flow chart of controlling the rotating speed of the pump body 34 based on the first temperature Tfin and the second temperature Tp is shown.

[0103] S31: Determine whether the temperature difference △T between the second temperature Tp and the first temperature Tfin is less than -10℃, if yes, proceed to S32, otherwise, proceed to S37.

[0104] Where -10℃ is also a preset value shown as an example.

[0105] When the temperature difference △T reaches the lower limit value of the second preset value, that is, △T is less than or equal to -10℃, S32 will also be performed.

[0106] The second preset value can be a temperature interval or a certain temperature, for example -10℃.

[0107] When △T is less than -10℃, it indicates that the temperature inside the heat exchange box 31 is lower than the temperature inside the electric control box E, so heat dissipation can be performed for the electric control box E.

[0108] At this time, the rotating speed of the pump body 34 is controlled according to the size of the second temperature Tfin inside the electric control box E.

[0109] The temperature inside the electric control box E can be divided into several temperature sections, and the temperature section to which the actually fed back second temperature Tfin belongs is determined, and the rotating speed of the pump body 34 is controlled based on the principle of increasing the rotating speed of the pump body 34 when Tfin is high.

[0110] As follows, the temperature inside the electric control box E is divided into three temperature sections.

[0111] S32: Determine whether Tfin is less than T2, if yes, proceed to S33, otherwise, proceed to S34.

[0112] Where T2 is a preset value shown as an example.

[0113] When Tfin reaches the lower limit value of the seventh preset value, that is, Tfin is less than or equal to T2, S33 will also be performed.

[0114] The seventh preset value can be a temperature interval or a certain temperature, for example T2.

[0115] S33: The pump body 34 operates at low speed.

[0116] Low-speed operation ensures heat dissipation for the electric control box E while ensuring low energy consumption of the pump body 34.

[0117] S34: determine whether Tfin is less than T3, if yes, proceed to S35, otherwise, proceed to S36.

[0118] wherein T3 is a preset value shown as an example.

[0119] When Tfin reaches a lower limit value of the eighth preset value, i.e., Tfin is less than or equal to T3, S35 is also proceeded to.

[0120] The eighth preset value can be a temperature interval or a certain temperature, for example, T3.

[0121] S35: the pump body 34 runs at a medium speed.

[0122] The first temperature Tfin increases, and the speed of the pump body 34 also increases from low speed to medium speed.

[0123] S36: the pump body 34 runs at a high speed.

[0124] The first temperature Tfin continues to increase, and the speed of the pump body 34 also increases from medium speed to high speed.

[0125] It should be noted that the low speed, medium speed and high speed of the pump body 34 are relative, and the specific speed value can be set according to the requirement.

[0126] S37: determine whether the temperature difference AT between the second temperature Tp and the first temperature Tfin is greater than 0℃, if yes, proceed to S2, otherwise, proceed to S38.

[0127] wherein 0℃ is a preset value shown as an example.

[0128] When the temperature difference AT reaches an upper limit value of the third preset value, i.e., AT is greater than or equal to 0℃, S2 is also proceeded to.

[0129] The third preset value can be a temperature interval or a certain temperature, for example, 0℃.

[0130] When AT is greater than 0℃, it indicates that the temperature in the heat exchange box 31 is higher than the temperature in the electric control box E, and therefore, the heat exchange module 33 is not used to dissipate heat for the electric control box E.

[0131] At this time, the pump body 34 is stopped.

[0132] When AT is less than or equal to 0℃ and greater than or equal to -10℃, it indicates that the temperature in the heat exchange box 31 is slightly lower than the temperature in the electric control box E, and therefore, the heat exchange module 33 can be used to dissipate heat for the electric control box E.

[0133] At this time, the speed of the pump body 34 is controlled according to the size of the second temperature Tfin in the electric control box E.

[0134] The temperature in the electric control box E can be divided into several temperature sections, and the temperature section to which the actual feedback second temperature Tfin belongs is determined. Based on the principle of increasing the rotation speed of the pump body 34 when Tfin is high, the rotation speed of the pump body 34 is controlled.

[0135] The temperature in the electric control box E is divided into two temperature sections as follows.

[0136] S38: Determine whether Tfin is less than T2. If yes, proceed to S39, otherwise, proceed to S39'.

[0137] T2 is a preset value shown as an example.

[0138] When Tfin reaches the lower limit of the ninth preset value, i.e., Tfin is less than or equal to T2, S39 is also performed.

[0139] The ninth preset value can be a temperature interval or a certain temperature, such as T2.

[0140] S39: The pump body 34 operates at medium speed.

[0141] The pump body 34 operates at medium speed, which ensures heat dissipation of the electric control box E and low energy consumption of the pump body 34.

[0142] S39': The pump body 34 operates at high speed.

[0143] The first temperature Tfin continues to increase, and the rotation speed of the pump body 34 also increases from medium speed to high speed.

[0144] The heat of the electric control box E is dissipated by the heat exchange module 33 and exchanged to the heat exchange module 33, achieving energy recovery.

[0145] Referring to Figure 1 The heat exchange box 31 is also provided with a water supplement pipeline 36 for supplementing water in the heat exchange box 31. A water outlet pipeline (not shown) can also be provided on the heat exchange box 31 for discharging hot water in the heat exchange box 31 for use.

[0146] Through the above control, the heat exchange module 34 can be used to dissipate heat of the electric control box E when the air conditioning system operates in the cooling mode, and heat can be recovered at the same time.

[0147] Referring to Figure 9 which shows a flowchart when the heat exchange box 31 has heating demand when the air conditioning system operates in the heating mode.

[0148] S1': When the ambient temperature is greater than a set value (for example, -25°C), if the heat exchange box 31 also has heating demand, proceed to S2'.

[0149] The air conditioning system is in the heating mode, and the heating demand of the heat exchange tank 31 can be met.

[0150] When the ambient temperature is not lower than the set value, the heat exchange tank 31 is heated, and the main purpose is to store heat in the heat exchange tank 31 for standby, so that the heat exchange module 33 preheats the electric control box E when the ambient temperature is lower than-25°C.

[0151] S2': EVW is fully opened.

[0152] When the EVW is fully opened, the high-temperature and high-pressure gas pressurized by the compressor 11 also partially enters the refrigerant coil 32 to exchange heat with the water in the heat exchange tank 31, thereby increasing the water temperature.

[0153] S3': Determine whether the second temperature Tp is greater than 15°C, if yes, proceed to S4', otherwise, return to S3'.

[0154] The 15°C is a preset value shown as an example.

[0155] When Tp reaches the upper limit of the tenth preset value, that is, Tp is greater than or equal to 15°C, S4' is also performed.

[0156] The tenth preset value can be a temperature interval or a certain temperature, for example, 15°C.

[0157] S4': Close the EVW.

[0158] By heating the heat exchange water tank 31 when the air conditioning system is in the heating mode, the user's indoor heating can be realized, and hot water can also be provided to the user side through the water outlet pipeline arranged on the heat exchange tank 31, which is convenient for the user's life.

[0159] Referring to Figure 10 , a flowchart of the heat exchange module 33 preheating the electric control box E is shown.

[0160] S1'': When the ambient temperature is detected to be less than or equal to-25°C, if the air conditioning system has a heating demand, proceed to S2''.

[0161] The-25°C is a preset value shown as an example.

[0162] When the ambient temperature reaches the lower limit of the preset ambient temperature, that is, the ambient temperature is lower than-25°C, if the air conditioning system has a heating demand, S2'' is also performed.

[0163] The preset ambient temperature can be a temperature interval or a certain temperature, for example, -25°C.

[0164] When the ambient temperature reaches the lower limit of the preset ambient temperature, it indicates that the current ambient temperature is an ultra-low ambient temperature.

[0165] In some embodiments of the present application, when the ambient temperature is less than or equal to -25℃, it indicates that the current ambient temperature is an ultra-low ambient temperature condition.

[0166] In the ultra-low ambient temperature condition, if the electrical components in the electric control box E are suddenly turned on, it may cause damage to the internal electrical components. Therefore, before the air conditioning system enters the heating mode, the working reliability of the electric control box E needs to be ensured.

[0167] S2'' : Determine whether the first temperature Tfin is less than the ambient temperature. If yes, proceed to S4'', otherwise, proceed to S3''.

[0168] The first temperature Tfin in the electric control box E is determined to determine whether the electric control box E needs to be preheated.

[0169] S3'' : The air conditioning system enters the heating mode.

[0170] S4'' : Determine whether the second temperature Tp is greater than 15℃. If yes, proceed to S5'', otherwise, proceed to S6''.

[0171] Before the heat exchange module 33 preheats the electric control box E, the temperature Tp of the medium in the heat exchange box 31 needs to be ensured, that is, whether Tp is greater than 15℃ is determined.

[0172] The 15℃ is a preset value shown as an example.

[0173] When Tp reaches the upper limit of the fourth preset value, that is, Tp is greater than or equal to 15℃, S5'' will also be performed.

[0174] The fourth preset value can be a temperature interval or a certain temperature, for example, 15℃.

[0175] S5'' : The pump body 34 operates at low speed.

[0176] The pump body 34 operates at low speed, which saves the energy consumption of the pump body 34 while preheating the electric control box E.

[0177] S6'' : The heating module works, and returns to S4'' after a certain period of time (for example, five minutes).

[0178] The heating module works, heats the medium in the heat exchange box E, and detects the first temperature Tp every certain period of time until Tp is greater than 15℃, and then the heating module is turned off.

[0179] S7'' : Determine whether Tfin is greater than -20℃. If yes, proceed to S8'', otherwise, proceed to S9''.

[0180] The -20℃ is a preset value shown as an example.

[0181] When Tfin reaches the upper limit of the fifth preset value, i.e., Tfin is greater than or equal to -20℃, it also proceeds to S8''.

[0182] The fifth preset value can be a temperature interval or a certain temperature, for example, -20℃.

[0183] S8'' : Maintaining the low-speed operation of the pump body 34 for a certain period of time and then stopping.

[0184] It can be considered that when Tfin is greater than -20℃, the electric control box E is started at this time, which can avoid damage to the electrical components in the electric control box E.

[0185] Therefore, in order to save energy, the pump body 34 is stopped after low-speed operation for a certain period of time (for example, five minutes).

[0186] S9'' : The pump body 34 is operated at high speed, and returns to S7'' after a certain period of time (for example, five minutes).

[0187] The pump body 34 is operated at high speed, which accelerates the heat exchange between the heat exchange module 33 and the electric control box E, and more efficiently preheats the electric control box E, so that the first temperature Tfin in the electric control box E is greater than -20℃.

[0188] Through the above control, the preheating of the electric control box E in the ultra-low temperature condition can be realized, the working reliability of the electrical components in the electric control box E before starting is improved, and the use reliability of the air conditioning system is improved.

[0189] In addition, in order to prevent freezing of the medium in the pipeline between the heat exchange water tank 31 and the heat exchange module 33 in the heat dissipation unit 30, a temperature sensor (not shown) for detecting the temperature Tw of the medium in the pipeline is arranged.

[0190] When Tw is less than 1℃, the pump body 34 is operated at low speed for a certain period of time (for example, three minutes).

[0191] Wherein 1℃ is a preset value shown as an example.

[0192] When Tw reaches the lower limit of the sixth preset value, i.e., Tw is less than or equal to 10℃, the pump body 34 is also operated at low speed for a certain period of time.

[0193] The sixth preset value can be a temperature interval or a certain temperature, for example, 1℃.

[0194] Referring to Figure 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 is connected with the oil separator 16 and the gas-liquid separator 18 respectively, and the oil separator 16 and the gas-liquid separator 17 are connected with the indoor side.

[0195] In the air conditioning system, refrigeration oil is used to lubricate and cool the cylinder of the compressor 11.

[0196] The compressor 11 is provided with a refrigerant outlet and a refrigerant inlet respectively communicating with the compressor cylinder.

[0197] The compressor 11 is used to suck gaseous refrigerant from the refrigerant inlet, compress and liquefy the gaseous refrigerant, and then output the liquid refrigerant to the indoor unit side (not shown) through the refrigerant outlet and the pipeline, the liquid refrigerant is vaporized in the coil of the indoor unit side to absorb heat, and finally returns to the compressor 11 to complete the entire cycle process.

[0198] The liquid refrigerant output from the refrigerant outlet of the compressor 11 first enters the oil separator 16.

[0199] The oil separator 16 is provided with an oil inlet, an oil return outlet A' and an oil outlet.

[0200] 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 output to the gas-liquid separator 17 from the oil return outlet A'.

[0201] The gas-liquid separator 17 is provided with a gas inlet B' and a gas outlet, the gas inlet B' communicates with the four-way valve 90, and the gas outlet communicates with the refrigerant inlet.

[0202] The gas inlet B' and the oil return outlet A' are connected by a pipeline.

[0203] Referring to Figure 1 The oil return capillary 18 can be provided on the pipeline, or the oil return capillary 18 and a filter (not shown) can be connected in series on the pipeline, the refrigeration oil output from the oil return outlet A' enters the gas inlet B' through the oil return capillary 18 or both the oil return capillary 18 and the filter, to ensure oil return.

[0204] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can still be modified by those of ordinary skill in the art, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed by the present application.

Claims

1. An air conditioning system comprising an outdoor unit and an indoor unit, characterized by, The air conditioning system further comprises a heat dissipation unit, and the heat dissipation unit comprises: a heat exchange box body, which is internally provided with a refrigerant coil and a heating module, the refrigerant coil is arranged in parallel with the indoor unit, and a switch element is arranged on a pipeline in parallel with the indoor unit and in series with the refrigerant coil; a heat exchange module, which is attached to the outside of an electric control box of the outdoor unit and internally communicates with the heat exchange box body; a pump body, which is arranged on a water pipeline between the heat exchange box body and the heat exchange module; a processing unit, which is configured to, when the air conditioning system is in a cooling operation, control the rotating speed of the pump body based on a first temperature in the electric control box and a second temperature of a medium in the heat exchange box body; the processing unit is further configured to: when it is detected that the ambient temperature is greater than a preset ambient temperature and the heat exchange box body has a heating demand, control the air conditioning system to operate in a heating mode and open the switch element, and then when the second temperature reaches an upper limit value of a fourth preset value, close the switch element to make the heat exchange box body store heat; when the ambient temperature is less than or equal to the preset ambient temperature and the air conditioning system has a heating demand, if the first temperature is less than or equal to the ambient temperature, proceed to S, otherwise, the air conditioning system starts the heating mode; S: determine whether the second temperature reaches the upper limit value of the fourth preset value, if yes, control the pump body to operate, otherwise, start the heating module until the heating module is closed when the second temperature reaches the upper limit value of the fourth preset value, and the pump body is started to make the heat exchange module preheat the electric control box first; during the preheating of the electric control box, when the first temperature reaches an upper limit value of a fifth preset value, the pump body is maintained to operate at a low speed for a period of time and then stopped, and thereafter the air conditioning system starts the heating mode.

2. The air conditioning system of claim 1, wherein, when the processing unit is configured to make the air conditioning system operate in the cooling mode, the pump body is stopped when the first temperature reaches a lower limit value of a first preset value; when the first temperature reaches an 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.

3. The air conditioning system of claim 2, wherein 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, specifically: when the difference between the second temperature and the first temperature reaches a lower limit value of a second preset value, the rotating speed of the pump body is controlled according to the temperature section to which the first temperature belongs; when the difference between the second temperature and the first temperature reaches an upper limit value of a third preset value, the pump body is stopped; when the difference between the second temperature and the first temperature reaches the upper limit value of the second preset value and a lower limit value of the third preset value, the rotating speed of the pump body is controlled according to the temperature section to which the first temperature belongs; wherein the temperature section increases, and the rotating speed of the pump body corresponding to the temperature section also increases.

4. The air conditioning system of claim 1, wherein when the second temperature reaches an upper limit value of a fourth preset value, the pump body is first operated at a low speed, and then it is determined whether the first temperature reaches an upper limit value of a fifth preset value, if yes, the pump body is maintained to operate at the low speed for a period of time and then stopped, otherwise, the pump body is operated at a high speed until the first temperature reaches the upper limit value of the fifth preset value.

5. The air conditioning system of claim 1, wherein, The heat exchange module comprises: a heat exchange cavity, a first side wall of which is in close contact with the electric control box, a plurality of partitions are arranged in the heat exchange cavity, and flow channels are formed between adjacent partitions; an inlet and an outlet, which are connected to the heat exchange cavity and the heat exchange box through pipelines.

6. The air conditioning system of claim 5, wherein, The adjacent partitions in the plurality of partitions are arranged in an inclined staggered manner, one end of each partition abuts against the first side wall, and the other end abuts against a second side wall opposite to the first side wall of the heat exchange cavity.

7. The air conditioning system of claim 5, wherein, The part between the first side wall of the heat exchange cavity and the electric control box is coated with heat-conducting silica gel.

8. The air conditioning system of claim 1, wherein, The air conditioning system further comprises an oil separator and a gas-liquid separator; The oil separator has an oil return outlet; The gas-liquid separator has a gas inlet, the gas inlet is communicated with the oil return outlet, and an oil return capillary is arranged on the pipeline between the oil return outlet and the gas inlet; or An oil return capillary and a first filter are arranged in series on the pipeline between the oil return outlet and the gas inlet.

9. The air conditioning system of claim 1, wherein, The processing unit is further configured to: When the temperature of the medium in the pipeline between the heat exchange box and the heat exchange module reaches the lower limit of the sixth preset value, the pump body operates at a low speed for a plurality of times.

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