阅读说明：本技术 空调系统 (Air conditioning system ) 是由 丘永琪 陈君 惠晓卫 于 2021-08-24 设计创作，主要内容包括：本申请实施例提供一种空调系统,包括：压缩机、冷凝器和蒸发器；蒸发器的第一端通过管路连接至压缩机的进气口,压缩机的出口通过管路连接至冷凝器的第一端,冷凝器的第二端通过管路连接至蒸发器的第二端；蒸发器和冷凝器中的至少一个为微通道换热器,微通道换热器包括集气管、集液管和扁管,多个扁管连通在集气管和集液管之间,扁管的长度方向和水平面呈夹角设置,集气管相对于水平面的高度高于集液管相对于水平面的高度,扁管伸入集气管内一段长度,相邻两个扁管和集液管的壁面之间围设形成容置压缩机油的滞留区；滞留区通过回油管路和压缩机的进气口连通。本申请实施例提供一种空调系统,可以提高压缩机的可靠性。(An embodiment of the present application provides an air conditioning system, includes: a compressor, a condenser and an evaporator; the first end of the evaporator is connected to the air inlet of the compressor through a pipeline, the outlet of the compressor is connected to the first end of the condenser through a pipeline, and the second end of the condenser is connected to the second end of the evaporator through a pipeline; at least one of the evaporator and the condenser is a micro-channel heat exchanger, the micro-channel heat exchanger comprises a gas collecting pipe, a liquid collecting pipe and flat pipes, a plurality of flat pipes are communicated between the gas collecting pipe and the liquid collecting pipe, the length direction of the flat pipes and the horizontal plane form an included angle, the height of the gas collecting pipe relative to the horizontal plane is higher than that of the liquid collecting pipe relative to the horizontal plane, the flat pipes extend into the gas collecting pipe for a section, and a detention area for containing compressor oil is defined between the wall surfaces of two adjacent flat pipes and the liquid collecting pipe; the stagnant zone is communicated with the air inlet of the compressor through an oil return pipeline. The embodiment of the application provides an air conditioning system, which can improve the reliability of a compressor.)

1. An air conditioning system, comprising: a compressor, a condenser and an evaporator;

a first end of the evaporator is connected to an air inlet of the compressor through a pipeline, an outlet of the compressor is connected to a first end of the condenser through a pipeline, and a second end of the condenser is connected to a second end of the evaporator through a pipeline;

at least one of the evaporator and the condenser is a micro-channel heat exchanger, the micro-channel heat exchanger comprises a gas collecting pipe, a liquid collecting pipe and flat pipes, a plurality of flat pipes are communicated between the gas collecting pipe and the liquid collecting pipe, the length direction of each flat pipe and the horizontal plane form an included angle, the height of the gas collecting pipe relative to the horizontal plane is higher than that of the liquid collecting pipe relative to the horizontal plane, the flat pipes extend into the gas collecting pipe for a section, and a detention area for containing compressor oil is defined between each two adjacent flat pipes and the wall surface of the gas collecting pipe;

the stagnation area is communicated with an air inlet of the compressor through an oil return pipeline.

2. The air conditioning system of claim 1, wherein said evaporator and said condenser are both said microchannel heat exchanger, said stagnant zone of both said evaporator and said condenser being communicated to an air intake of said compressor by an oil return line.

3. The air conditioning system of claim 1 or 2, further comprising a confluence device, a plurality of stagnant zones being in communication with the confluence device, the confluence device being in communication with the return line.

4. The air conditioning system according to claim 3, wherein the confluence device comprises a confluence main and confluence branch segments, wherein the confluence branch segments are arranged in parallel and connected to one side of the confluence main, the confluence branch segments are communicated with the confluence main, the confluence branch segments are arranged and communicated with the retention areas in a one-to-one correspondence, and the confluence main is communicated with the oil return pipeline.

5. The air conditioning system as claimed in claim 4, wherein the branch junction is provided with a boss, the surface of the boss is provided with an opening, the bottom of the stagnant zone is provided with an opening corresponding to the opening on the boss, and the branch junction and the stagnant zone are welded and sealed.

6. The air conditioning system according to claim 1 or 2, wherein the cross section of the gas collecting pipe is circular or elliptical, the symmetry axis of the flat pipe in the width direction is offset with respect to the symmetry axis of the cross section of the gas collecting pipe in the vertical direction, the stagnant zones are communicated with each other, and an opening for communicating the oil return pipeline is arranged on each stagnant zone.

7. The air conditioning system according to claim 1 or 2, wherein the cross section of the gas collecting pipe is rectangular, the width of the flat pipe is smaller than the width between the inner side walls of the gas collecting pipe, a converging groove is formed in the bottom wall of the gas collecting pipe and is located between the flat pipe and the side wall of the gas collecting pipe, the converging groove extends along the length direction of the gas collecting pipe, and an opening for communicating the oil return pipeline is formed in the converging groove.

8. The air conditioning system as claimed in any one of claims 2 to 7, further comprising: the three-way valve, the three-way valve includes import and two exports, the access connection of three-way valve is in the first end of evaporimeter, the first exit linkage of three-way valve is to the air inlet of compressor, the second exit linkage of three-way valve is to the first end of condenser.

9. The air conditioning system as claimed in any one of claims 2 to 7, further comprising: a first valve connected between the first end of the evaporator and the first end of the condenser, and a second valve connected between the first end of the evaporator and the air intake of the compressor.

10. The air conditioning system of claim 8 or 9, further comprising a third valve connected between the compressor and the condenser, a fourth valve connected between the second end of the condenser and the second end of the evaporator, and a throttling device arranged in parallel with the fourth valve.

11. The air conditioning system of any of claims 2-10, further comprising a gas-liquid separator connected between the evaporator and an air inlet of the compressor, the return line being connected to the gas-liquid separator.

12. An air conditioning system according to any of claims 2-11, further comprising an oil separator connected between the outlet of the compressor and the condenser.

13. An air conditioning system according to any of claims 1 to 12, wherein the angle between the length of the flat tubes and the horizontal is 45 ° to 90 °.

Technical Field

The application relates to the technical field of air conditioning systems, in particular to an air conditioning system.

Background

Compared with a copper tube through fin heat exchanger, the micro-channel heat exchanger is made of all-aluminum materials and has the advantage of low cost, so more and more manufacturers try to replace an evaporator and a condenser of an air conditioner with the micro-channel heat exchanger.

In the correlation technique, air conditioning system's evaporimeter and condenser can all use the microchannel heat exchanger, and the microchannel heat exchanger includes collector and flat pipe, and flat union coupling is between two collectors, and flat pipe can vertically place during the use, and two collectors are upper and lower position relation.

At the moment, a retention area is formed in the collecting pipe, and the compressor oil cannot continuously flow along with the pipeline after entering the retention area and cannot return to the compressor, so that the stable and reliable operation of the compressor is influenced.

Disclosure of Invention

The embodiment of the application provides an air conditioning system, which can improve the reliability of a compressor.

An aspect of an embodiment of the present application provides an air conditioning system, including: a compressor, a condenser and an evaporator; the first end of the evaporator is connected to the air inlet of the compressor through a pipeline, the outlet of the compressor is connected to the first end of the condenser through a pipeline, and the second end of the condenser is connected to the second end of the evaporator through a pipeline; at least one of the evaporator and the condenser is a micro-channel heat exchanger, the micro-channel heat exchanger comprises a gas collecting pipe, a liquid collecting pipe and flat pipes, a plurality of flat pipes are communicated between the gas collecting pipe and the liquid collecting pipe, the length direction of the flat pipes and the horizontal plane form an included angle, the height of the gas collecting pipe relative to the horizontal plane is higher than that of the liquid collecting pipe relative to the horizontal plane, the flat pipes extend into the gas collecting pipe for a section, and a detention area for containing compressor oil is defined between the wall surfaces of two adjacent flat pipes and the gas collecting pipe; the detention zone is communicated with an air inlet of the compressor through an oil return pipeline.

The embodiment of the application provides an air conditioning system, through increasing back oil pipe way, intercommunication detention district and compressor air inlet to during the fluid that realizes the detention district flows back to the compressor, can improve the operational reliability of compressor.

In one possible embodiment, the evaporator and the condenser are both microchannel heat exchangers, and the stagnant zones of the evaporator and the condenser are both communicated to the air inlet of the compressor through oil return pipelines.

The gas collecting pipes of the evaporator and the condenser can form a detention area, and oil in the detention area can flow back to the compressor by arranging an oil return pipeline communicated to the compressor.

In one possible embodiment, the air conditioning system further comprises a confluence device, the plurality of stagnant zones are communicated with the confluence device, and the confluence device is communicated with the oil return pipeline.

Through set up the collection flow device on the discharge to in will gathering the flow device with the fluid in a plurality of detention districts earlier, the rethread returns oil pipe way and discharges, thereby can reduce the quantity that returns oil pipe way, simplify air conditioning system's overall structure.

In a possible implementation mode, the confluence device comprises a confluence main pipe and confluence branch sections, the confluence branch sections are arranged in parallel and connected to one side of the confluence main pipe, the confluence branch sections are communicated with the confluence main pipe, the confluence branch sections are arranged and communicated with the retention areas in a one-to-one correspondence mode, and the confluence main pipe is communicated with the oil return pipeline.

The branch knot that converges communicates with the detention district respectively, can have the compressor that is detained to collect in will converging the house steward, derive from returning oil pipe way again, simple structure realizes easily.

In a possible embodiment, a boss is arranged on the confluence branch section, an opening is arranged on the surface of the boss, an opening corresponding to the opening on the boss is arranged at the bottom of the detention area, and the confluence branch section and the detention area are welded and sealed.

The confluence branch knot and the detention area are welded and sealed, so that confluence is smooth, and the connection reliability is improved.

In a possible embodiment, the cross section of the gas collecting pipe is circular or elliptical, the symmetry axis of the flat pipe in the width direction is offset relative to the symmetry axis of the cross section of the gas collecting pipe in the vertical direction, the detention areas are communicated with each other, and the detention areas are provided with openings for communicating the oil return pipeline.

The offset flat pipe makes the detention zone communicate with each other, thereby being favorable to the gathering of detention compressor oil, being favorable to returning oil pipe's setting, being favorable to simplifying holistic structural design.

In a possible implementation mode, the cross section of the gas collecting pipe is rectangular, the width of each flat pipe is smaller than the width between the inner side walls of the gas collecting pipe, a collecting groove is formed in the bottom wall of the gas collecting pipe and located between the side walls of the flat pipes and the gas collecting pipe, the collecting groove extends along the length direction of the gas collecting pipe, and an opening used for communicating the oil return pipeline is formed in the collecting groove.

The gas collecting pipe with the rectangular cross section is arranged, so that the retention areas can be communicated with each other, thereby being beneficial to the collection of retained compressor oil, being beneficial to the arrangement of an oil return pipeline and being beneficial to simplifying the integral structural design.

In one possible embodiment, the air conditioning system further comprises: the three-way valve, the three-way valve includes import and two exports, and the access connection of three-way valve is in the first end of evaporimeter, and the first exit linkage of three-way valve is to the air inlet of compressor, and the second exit linkage of three-way valve is to the first end of condenser.

After the three-way valve is additionally arranged, the air conditioning system can form an unpowered loop in which the working medium directly enters the condenser from the evaporator and a loop passing through the compressor, and the two loops are matched for use, so that the heat exchange efficiency is ensured, and the power consumption is reduced as much as possible.

In one possible embodiment, the air conditioning system further comprises: a first valve connected between the first end of the evaporator and the first end of the condenser, and a second valve connected between the first end of the evaporator and the air intake of the compressor.

Through setting up first valve and second valve, can play the same effect with above-mentioned three-way valve, realize the switching of two return circuits.

In a possible embodiment, the air conditioning system further comprises a third valve, a fourth valve and a throttling device, the third valve is connected between the compressor and the condenser, the fourth valve is connected between the second end of the condenser and the second end of the evaporator, and the throttling device and the fourth valve are arranged in parallel.

Through the opening and closing of the control valve, working media can be controlled to circulate in different loops, so that the control valve is suitable for different scenes.

In one possible embodiment, the air conditioning system further comprises a gas-liquid separator connected between the evaporator and the air inlet of the compressor, and the oil return line is connected to the gas-liquid separator.

The gas-liquid separator can separate gaseous refrigerant and liquid refrigerant, so that the gaseous refrigerant can enter the compressor, and the abnormal operation of the compressor caused by the liquid refrigerant entering the compressor is prevented.

In one possible embodiment, the air conditioning system further comprises an oil separator connected between the outlet of the compressor and the condenser.

The oil separator can separate the compressor oil and reduce the compressor oil entering the condenser, thereby improving the operation reliability of the compressor.

In one possible embodiment, the angle between the length direction of the flat tubes and the horizontal plane is 45 ° to 90 °.

After the included angle between the length direction of the flat pipe and the horizontal plane exceeds 45 degrees, the gaseous working medium can enter the collecting pipe above under the action of buoyancy.

The air conditioning system that this application embodiment provided, through increasing back oil pipe way, the stagnant area with evaporimeter and/or condenser communicates to the compressor air inlet to realize during the fluid reflux of stagnant area the compressor, in order to improve the operational reliability of compressor. And, set up the collection flow device through increasing on the collector, perhaps improve the structure of collector to collect the compressor oil in a plurality of detention districts after with return oil pipe intercommunication again, with the backward flow efficiency of improvement detention district fluid. Thereby, this application embodiment can solve the microchannel heat exchanger as evaporimeter and condenser, the unable problem of backward flow of stagnant area compressor oil that flat vertical setting of pipe leads to is favorable to adopting the microchannel heat exchanger as the air conditioner of condenser and evaporimeter and the performance promotion of the compound air conditioner of heat exchange, is favorable to effectively collecting the collector with the gaseous working medium in the evaporimeter, collects the collector with the liquid working medium in the condenser.

Drawings

Fig. 1 is a schematic structural view of an air conditioning system provided in the related art;

FIG. 2 is a schematic structural view of a microchannel heat exchanger provided in the related art;

fig. 3 is a schematic cross-sectional view of a flat tube provided in the related art;

fig. 4 is a state diagram of a microchannel heat exchanger in an air conditioning system provided in the related art;

fig. 5a is a schematic structural diagram of an air conditioning system according to an embodiment of the present application;

fig. 5b is a schematic structural diagram of an air conditioning system according to an embodiment of the present application;

FIG. 6a is a schematic circuit diagram of an air conditioning system according to an embodiment of the present application;

FIG. 6b is a schematic diagram of another circuit of an air conditioning system according to an embodiment of the present application;

FIG. 7 is a schematic view of a microchannel heat exchanger in an air conditioning system according to an embodiment of the present disclosure;

fig. 8a is a schematic structural diagram of an air conditioning system according to an embodiment of the present application;

fig. 8b is a schematic structural diagram of an air conditioning system according to an embodiment of the present application;

fig. 8c is a schematic structural diagram of an air conditioning system according to an embodiment of the present application;

fig. 8d is a schematic structural diagram of an air conditioning system according to an embodiment of the present application;

FIG. 9 is a schematic perspective view of a microchannel heat exchanger and a manifold device according to an embodiment of the present disclosure;

FIG. 10 is an exploded schematic view of a microchannel heat exchanger and manifold apparatus provided in accordance with an embodiment of the present application;

FIG. 11 is a schematic front view of a microchannel heat exchanger and a manifold apparatus provided in accordance with an embodiment of the present application;

FIG. 12 is a cross-sectional view taken along line A-A of FIG. 11;

FIG. 13 is a cross-sectional view corresponding to B-B in FIG. 11;

fig. 14 is a schematic diagram of a cross-section of a header provided in accordance with an embodiment of the present application;

fig. 15 is a schematic view of another cross-section of a header provided in accordance with an embodiment of the present application;

fig. 16 is a schematic view of yet another cross-section of a header provided in accordance with an embodiment of the present application;

fig. 17 is a schematic cross-sectional view of a gas collecting tube according to an embodiment of the present application;

fig. 18 is a schematic view of yet another cross-section of a header provided in an embodiment of the present application.

Description of reference numerals:

11-a compressor; 12-a condenser; 13-an evaporator; 14-three-way valve; 141-a first valve; 142-a second valve; 15-a third valve; 16-a fourth valve; 17-a throttling device; 18-a gas-liquid separator; 19-an oil separator; 200-a microchannel heat exchanger; 21-a header; 211-a gas header; 2111-upper cover; 2112-lower cover; 2113-bus duct; 2114. 2115-opening the pores; 212-a collector tube; 22-flat tube; 221-a microchannel; 23-a retention zone; 300-oil return line; 400-a confluence device; 41-a confluence manifold; 42-confluence branch node; 421-a boss; 422-open pores.

Detailed Description

Fig. 1 is a schematic structural diagram of an air conditioning system provided in the related art. Referring to fig. 1, the air conditioning system may include a compressor 11, a condenser 12, and an evaporator 13, wherein the compressor 11 may compress a gaseous refrigerant into a high-temperature and high-pressure refrigerant, the high-temperature and high-pressure refrigerant enters the condenser 12, is liquefied after heat dissipation at the condenser 12, and the liquid refrigerant enters the evaporator 13, is converted into a gaseous state after absorbing a large amount of heat at the evaporator 13, and then is re-circulated in the compressor 11.

A throttling device 17 is further connected between the condenser 12 and the evaporator 13, the specific structure of the throttling device 17 includes, but is not limited to, an electronic expansion valve, a thermostatic expansion valve, a capillary tube, etc., the throttling device 17 is used for throttling and depressurizing the high-pressure liquid refrigerant to ensure the pressure difference between the condenser 12 and the evaporator 13, so that the liquid refrigerant in the evaporator 13 is evaporated and absorbs heat at the required low pressure, thereby achieving the purpose of refrigeration and temperature reduction. At the same time, the throttling device 17 can adjust the flow rate of the refrigerant supplied to the evaporator 13 to adapt to the change of the heat load of the evaporator 13, so that the air conditioning system can operate more efficiently.

Generally, the condenser 12 and the evaporator 13 in the air conditioning system are heat exchangers of copper tube-fin heat exchangers and the like, and in order to reduce the cost, more and more air conditioning systems replace the condenser 12 and the evaporator 13 with microchannel heat exchangers. Fig. 2 is a schematic structural view of a microchannel heat exchanger provided in the related art, and fig. 3 is a schematic sectional view of a flat tube provided in the related art. Referring to fig. 2 and 3, the microchannel heat exchanger 200 may include headers 21 and flat tubes 22, and a plurality of the flat tubes 22 are connected between the two headers 21. The collector 21 can be cylindric, and flat pipe 22 can be flat tubulose, and the both ends of flat pipe 22 are connected respectively on the lateral wall of two collectors 21, are provided with a plurality of microchannels 221 in the flat pipe 22, and flat pipe 22 stretches into in the collector 21, and the working medium in two collectors 21 can be transmitted in microchannel 221.

Fig. 4 is a schematic view illustrating a state of a microchannel heat exchanger in an air conditioning system according to the related art. Referring to fig. 4, in the related art, a cylindrical header 21 of a microchannel heat exchanger 200 in an air conditioning system is vertically disposed with respect to a horizontal plane, and a flat tube 22 is horizontally disposed with respect to the horizontal plane, and a working fluid flows in a horizontal direction in a microchannel 221. At this time, gravity and buoyancy cannot be utilized, so that the gaseous working medium enters the header 21 under the action of buoyancy, a pump needs to be additionally arranged in the air conditioning system, or the compressor 11 is utilized to drive the flow of the working medium, and therefore, the energy consumption of the whole air conditioning system is high.

Based on the above problem, this application embodiment provides an air conditioning system, and through making flat pipe 22 personally submit the contained angle setting for the horizontal plane, can make gaseous state working medium get into the collector under the buoyancy to can reduce the holistic energy consumption of air conditioning system.

In a possible embodiment, the included angle of the flat tube 22 with respect to the horizontal plane may be 45 ° to 90 °, and when the included angle of the flat tube 22 with respect to the horizontal plane is 90 °, that is, the flat tube 22 is vertically disposed, the effect of the gaseous working medium entering the header under the buoyancy is better. In the following embodiment of the present application, the flat tubes 22 are vertically arranged, and the structure of the air conditioning system is described in more detail.

Fig. 5a is a schematic structural diagram of an air conditioning system according to an embodiment of the present application. Referring to fig. 5a, an embodiment of the present application provides an air conditioning system, which may include a compressor 11, a condenser 12, an evaporator 13, and a three-way valve 14, where the three-way valve 14 may include one inlet and two outlets, the inlet is connected to a first end of the evaporator 13, a first outlet of the three-way valve 14 is connected to an air inlet of the compressor 11, an outlet of the compressor 11 is connected to a first end of the condenser 12 through a pipeline, a second outlet of the three-way valve 14 is connected to a first end of the condenser 12, and a second end of the condenser 12 is connected to a second end of the evaporator 13 through a pipeline.

At least one of the condenser 12 and the evaporator 13 may be configured as a microchannel heat exchanger 200, and the flat tubes 22 of the microchannel heat exchanger 200 are vertically configured. Gaseous working medium in the flat pipe 22 can enter the upper collecting pipe 21 under the action of buoyancy, at the moment, the collecting pipe 21 above the flat pipe 22 serves as a gas collecting pipe, and the collecting pipe 21 below the flat pipe 22 serves as a liquid collecting pipe. Correspondingly, when the condenser 12 and the evaporator 13 are both arranged as the microchannel heat exchanger 200, the first end of the evaporator 13 is a gas collecting pipe, the second end of the evaporator 13 is a liquid collecting pipe, the first end of the condenser 12 is a gas collecting pipe, and the second end of the condenser 12 is a liquid collecting pipe.

Fig. 5b is a schematic structural diagram of an air conditioning system according to an embodiment of the present application. Referring to fig. 5b, in another possible embodiment, the same function as the three-way valve 14 may be achieved by providing a first valve 141 and a second valve 142. Wherein the first valve 141 is connected between the first end of the evaporator 13 and the first end of the condenser 12, and the second valve 142 is connected between the first end of the evaporator 13 and the air intake of the compressor 11.

Fig. 6a is a schematic circuit diagram of an air conditioning system according to an embodiment of the present disclosure, and fig. 6b is a schematic circuit diagram of an air conditioning system according to an embodiment of the present disclosure. Referring to fig. 6a and 6b, with the air conditioning system provided in fig. 5a, two circuits may be formed because the three-way valve 14 has two outlets. The first loop shown in fig. 6a is a gravity driving loop, the refrigerant is subjected to heat absorption evaporation in the evaporator 13, the gaseous working medium rises under the action of buoyancy and enters the condenser 12, the working medium is cooled and liquefied in the condenser 12, the liquid refrigerant flows downwards and then enters the evaporator 13, and the gravity driving loop does not need to be additionally provided with a compressor and other machines for providing power, so that the power consumption of the system is reduced. In the second loop shown in fig. 6b, the refrigerant circulates in the evaporator 13 and the condenser 12, the compressor 11 can provide power, the gaseous working medium output from the first end of the evaporator 13 passes through the compressor 11, the temperature and the pressure are increased, and then the gaseous working medium enters the condenser 12 for condensation, and the compressor 11 can improve the heat exchange efficiency.

By controlling the three-way valve 14, the flow circuit of the working fluid can be controlled, which can be operated either only according to the first circuit shown in fig. 6a or only according to the second circuit shown in fig. 6 b.

It will be understood that for the air conditioning system provided in fig. 5b, the circuit of fig. 6a can be realized by controlling the first valve 141 to be opened and the second valve 142 to be closed, and the circuit of fig. 6b can be realized by controlling the first valve 141 to be closed and the second valve 142 to be opened.

In a possible implementation manner, the air conditioning system provided in the embodiment of the present application is further provided with a third valve 15, a fourth valve 16 and a throttling device 17, the third valve 15 is connected between the compressor 11 and the condenser 12, the fourth valve 16 and the throttling device 17 are connected between the condenser 12 and the evaporator 13, and the fourth valve 16 and the throttling device 17 are arranged in parallel. Under the conditions that the second outlet of the three-way valve 14 is opened, the first outlet is closed, the third valve 15 is closed, the throttling device 17 is closed, and the fourth valve 16 is opened, the refrigerant flows in the first circuit, namely sequentially passes through the evaporator 13, the condenser 12 and the fourth valve 16 and then returns to the evaporator 13; when the first outlet of the three-way valve 14 is opened, the second outlet is closed, the third valve 15 is opened, the throttle device 17 is opened, and the fourth valve 16 is closed, the refrigerant flows in the second circuit, that is, passes through the evaporator 13, the compressor 11, the third valve 15, the condenser 12, and the throttle device 17 in this order, and then returns to the evaporator 13.

In addition, a gas-liquid separator 18 may be further disposed in the second circuit, the gas-liquid separator 18 may be connected to a front end of the compressor 11, that is, between the three-way valve 14 and the compressor 11, and the gas-liquid separator 18 may separate the gaseous refrigerant and the liquid refrigerant, so that the gaseous refrigerant may enter the compressor 11, and the abnormal operation of the compressor 11 caused by the liquid refrigerant entering the compressor 11 may be prevented.

An oil separator 19 may be further disposed in the second circuit, the oil separator 19 may be connected to a rear end of the compressor 11, that is, between the compressor 11 and the condenser 12, and the oil separator 19 may separate oil from the compressor, thereby reducing the entry of compressor oil into the condenser 12, and thus improving the operational reliability of the compressor.

It should be understood that the flat tubes 22 are extended into the header 21 by a length in order to communicate the flat tubes 22 with the header 21 in the art. Fig. 7 is a schematic view illustrating a state of a microchannel heat exchanger in an air conditioning system according to an embodiment of the present disclosure. Referring to fig. 7, in this embodiment of the application, flat pipe 22 of microchannel heat exchanger 200 is vertical, because flat pipe 22 stretches into a section length in collector 21, consequently in collector 211, the lateral wall of adjacent two flat pipe 22 and collector 211 encloses and establishes the detention district 23 that has certain volume, a plurality of detention districts 23 are mutually independent, compressor oil enters into collector 211 in the back, can be detained and can't flow in this detention district 23, can't enter into flat pipe 22 and return to compressor 11 through the pipeline in. On the other hand, the cross-sectional area of the gas collecting pipe 211 in the horizontal direction is large, and the flow velocity of the working medium is low, so that the compressor oil cannot be carried well for circulation.

Therefore, in the embodiment of the present application, because the flat tubes 22 are vertically arranged, oil return of the compressor is difficult, so that stable and reliable operation of the compressor 11 is affected.

Based on above-mentioned problem, this application embodiment provides an air conditioning system, through increasing back oil pipe way, communicates detention district and compressor air inlet to realize during the fluid reflux of detention district to the compressor, with the operational reliability who improves the compressor.

The air conditioning system provided by the present application will be described in more detail below with reference to the accompanying drawings and examples.

Fig. 8a is a schematic structural diagram of an air conditioning system according to an embodiment of the present application, fig. 8b is a schematic structural diagram of another air conditioning system according to an embodiment of the present application, fig. 8c is a schematic structural diagram of another air conditioning system according to an embodiment of the present application, and fig. 8d is a schematic structural diagram of another air conditioning system according to an embodiment of the present application. Referring to fig. 8a to 8c, in the air conditioning system provided by the embodiment of the present application, both the evaporator 13 and the condenser 12 are the microchannel heat exchanger 200, and the stagnation region 23 of the microchannel heat exchanger 200 is communicated with the air inlet of the compressor 11 through the oil return line 300.

It will be appreciated that there may be a stagnant zone 23 in both the condenser 12 and the evaporator 13. In one possible embodiment, as shown in fig. 8a, the stagnant zone 23 of the evaporator 13 may be connected to the intake of the compressor 11 by an oil return line 300. In another possible embodiment, as shown in fig. 8b, the stagnant zone 23 of the condenser 12 and the stagnant zone 23 of the evaporator 13 may be connected to the intake of the compressor 11 through oil return lines 300, respectively. In yet another possible embodiment, as shown in fig. 8c, the stagnant zone 23 of the condenser 12 may be connected to the evaporator 13 via a return line 300, and the stagnant zone 23 of the evaporator 13 may be connected to the intake of the compressor 11 via a return line 300.

The stagnant zone 23 in the above-mentioned air conditioning system is connected to the air intake of the compressor 11 through the oil return line 300, and the compressor oil stagnant in the stagnant zone 23 can be made to flow back into the compressor 11 through the oil return line 300. It will be appreciated that the oil return line 300 is connected to the air inlet of the compressor 11, and may be connected directly or indirectly to the air inlet of the compressor 11, or connected to a line between the evaporator 13 and the air inlet of the compressor 11, or connected to the gas-liquid separator 18 at the front end of the compressor 11 as shown in fig. 8d, to return the compressor oil to the compressor 11 through the oil return line 300.

It should be understood that in fig. 8 a-8 c, for simplicity and ease of understanding of the drawings, the above-described first circuit and various components such as valves are not shown, and only the core compressor 11, condenser 12 and evaporator 13 and the piping connecting them are shown.

In a microchannel heat exchanger 200, the quantity of flat pipe 22 is a plurality of, encloses between the lateral wall of flat pipe 22 and collecting pipe 211 and establishes the quantity that the detention district 23 that forms also is a plurality of, and a plurality of detention districts 23 independently set up each other and do not communicate, consequently, when setting up oil return pipeline 300, probably need set up a plurality of pipelines and communicate a plurality of detention districts 23 respectively to make the fluid in every detention district 23 all discharged.

In the embodiment of the present application, the collecting device is disposed on the gas collecting pipe 211, so as to collect the oil in the plurality of retention areas 23 into the collecting device, and then discharge the oil through the oil return pipeline 300, thereby reducing the number of the oil return pipelines and simplifying the overall structure of the air conditioning system.

Hereinafter, various bus devices provided by embodiments of the present application are described with reference to different drawings and embodiments.

Fig. 9 is a schematic perspective view of a microchannel heat exchanger and a junction device according to an embodiment of the present disclosure, and fig. 10 is an exploded schematic view of the microchannel heat exchanger and the junction device according to an embodiment of the present disclosure. Referring to fig. 9 and 10, the collecting device 400 may be connected to the gas collecting pipe 211, the collecting device 400 may include a collecting main pipe 41 and a plurality of collecting branch sections 42, the collecting main pipe 41 and the collecting branch sections 42 are both hollow structures and are communicated with each other, the plurality of collecting branch sections 42 are connected to the same side of the collecting main pipe 41 and are arranged in parallel, the plurality of collecting branch sections 42 and the plurality of retention areas 23 are arranged in a one-to-one correspondence, and the collecting branch sections 42 are connected below the retention areas 23.

Fig. 11 is a schematic front view of a microchannel heat exchanger and a header assembly according to an embodiment of the present disclosure, fig. 12 is a cross-sectional view taken along line a-a in fig. 11, and fig. 13 is a cross-sectional view taken along line B-B in fig. 11. Referring to fig. 11 to 13, the confluence manifold 41 may be connected to the oil return line 300, and each confluence branch node 42 is communicated with each stagnation area 23, respectively, so that the compressor oil staying in each stagnation area 23 flows into the confluence manifold 41 through the confluence branch node 42 and then flows into the oil return line 300.

The end of the branch junction 42 is provided with a boss 421 protruding relative to the collecting main 41, an opening 422 is provided on the upper surface of the boss 421, and the opening 422 is communicated with the hollow cavity inside the branch junction 42. Correspondingly, the bottom of the stagnation area 23 of the gas collecting pipe 211 is also provided with a through hole, the upper surface of the boss 421 is welded and sealed with the bottom of the gas collecting pipe 211, and the through hole at the bottom of the stagnation area 23 is communicated with the opening 422 on the confluence branch node 42, so that the compressor oil in the stagnation area 23 is converged into the confluence device 400. The oil return line 300 may be connected to any position on the confluence manifold 41 to achieve the return of the compressor oil in the stagnation area 23 to the compressor 11.

In this embodiment, the entire confluence device 400 may be regarded as a comb, the confluence branch segments 42 may be regarded as teeth of the comb, and the ends of the teeth are connected to the lower side of the side wall of the cylindrical gas collecting pipe 211.

It should be noted that the confluence device 400 with this structure is suitable for the gas collecting pipe 211 with a cylindrical or elliptic cylindrical shape, the cross section of the gas collecting pipe 211 is circular or elliptic, and the flat pipe 22 extends into the gas collecting pipe 211 for a length, which may result in the formation of the retention areas 23 that are not connected with each other. In one possible embodiment, the axis of symmetry in the width direction of the flat tubes 22 may coincide with the axis of symmetry in the vertical direction in the cross section of the gas collector 211, i.e. the flat tubes 22 are arranged in a central position with respect to the gas collector 211.

In another possible embodiment, the flat tubes 22 may be offset with respect to the gas collecting line 211. Fig. 14 is a schematic diagram of a cross-section of a header according to an embodiment of the present application. Referring to fig. 14, the gas collecting pipe 211 has a cylindrical or elliptical shape, the cross section of the gas collecting pipe 211 has a circular or elliptical shape, and the symmetry axis of the flat pipe 22 in the width direction is offset from the symmetry axis of the cross section of the gas collecting pipe 211 in the vertical direction. It should be understood that in this case, the flat tubes 22 projecting into the gas collection line 211 are at a greater distance from the side wall of the gas collection line 211, and the two adjacent stagnation zones 23 are no longer independent of one another but rather communicate with one another. At this time, the compressor oil can be returned by opening a hole at the bottom of the stagnation region 23 and connecting the return line 300.

In another possible embodiment, the gas collecting pipe 211 may have a rectangular parallelepiped column structure, and the cross section of the gas collecting pipe 211 may have a rectangular shape. Fig. 15 is a schematic view of another cross section of a gas header provided in an embodiment of the present application, fig. 16 is a schematic view of another cross section of a gas header provided in an embodiment of the present application, and fig. 17 is a schematic view of a cross-sectional structure of a gas header provided in an embodiment of the present application. Referring to fig. 15-17, the cross section of the gas collecting pipe 211 is rectangular, and the width w2 of the flat pipe 22 is smaller than the width w1 between the inner side walls of the gas collecting pipe 211, in this case, two adjacent stagnant zones 23 are not independent of each other, but communicate with each other. Can set up confluence groove 2113 on the diapire of gas collecting pipe 211, confluence groove 2113 can set up between flat pipe 22 and the lateral wall of gas collecting pipe 211, and confluence groove 2113 extends along the length direction of gas collecting pipe 211, and confluence groove 2113 can further communicate each detention zone 23, is favorable to compressor oil to collect in confluence groove 2113. By providing the opening 2114 at any position of the confluence groove 2113, the oil return line 300 can be connected, and the compressor oil in the stagnation region 23 can be returned to the compressor.

The gas collecting pipe 211 with a rectangular cross section may include an upper cover 2111 and a lower cover 2112, which are hermetically connected, and the flat pipe 22 may extend into the gas collecting pipe 211 from the lower cover 2112. Referring to fig. 15, the upper cap 2111 may include a top wall of the gas collecting duct 211, and the lower cap 2112 may include both side walls and a bottom wall of the gas collecting duct 211. Referring to fig. 16, the upper cap 2111 may include a top wall and two side walls of the gas manifold 211, and the lower cap 2112 may include a bottom wall of the gas manifold 211.

Fig. 18 is a schematic view of yet another cross-section of a header provided in an embodiment of the present application. Referring to fig. 18, when the cross section of the gas collecting pipe 211 is rectangular, a plurality of openings 2115 may be further disposed on a side wall surface of the gas collecting pipe 211, each opening 2115 is disposed corresponding to each stagnant zone 23, a collecting device 400 may be mounted outside the side wall of the gas collecting pipe 211, the collecting device 400 has a hollow cavity, and the plurality of openings 2115 may communicate with the collecting device 400. The compressor oil retained in each retention zone 23 first flows out through the opening 2115 and is collected in the confluence device 400, and any position of the confluence device 400 may be opened and connected to the oil return line 300 to realize the return of the compressor oil to the compressor 11.

The air conditioning system that this application embodiment provided, through increasing back oil pipe way, the stagnant area with evaporimeter and/or condenser communicates to the compressor air inlet to realize during the fluid reflux of stagnant area the compressor, in order to improve the operational reliability of compressor. And, set up the collection flow device through increasing on the collector, perhaps improve the structure of collector to collect the compressor oil in a plurality of detention districts after with return oil pipe intercommunication again, with the backward flow efficiency of improvement detention district fluid. Thereby, this application embodiment can solve the microchannel heat exchanger as evaporimeter and condenser, the unable problem of backward flow of stagnant area compressor oil that flat vertical setting of pipe leads to is favorable to adopting the microchannel heat exchanger as the air conditioner of condenser and evaporimeter and the performance promotion of the compound air conditioner of heat exchange, is favorable to effectively collecting the collector with the gaseous working medium in the evaporimeter, collects the collector with the liquid working medium in the condenser.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto; although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.