CN212006013U - Multi-split air conditioning system - Google Patents
Multi-split air conditioning system Download PDFInfo
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- CN212006013U CN212006013U CN202020319663.0U CN202020319663U CN212006013U CN 212006013 U CN212006013 U CN 212006013U CN 202020319663 U CN202020319663 U CN 202020319663U CN 212006013 U CN212006013 U CN 212006013U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The utility model provides a multi-split air conditioning system, including indoor set, set up in the indoor heat exchanger of indoor set inside, indoor heat exchanger includes the first heat transfer area that heat transfer capacity is stronger and the second heat transfer area that heat transfer capacity is weaker, first heat transfer area connects first feed liquor pipe and first outlet duct, second heat transfer area connects second feed liquor pipe and first drain pipe; a liquid stop valve is arranged on the second liquid inlet pipe, an indoor electronic expansion valve is arranged between the first liquid outlet pipe and the first liquid inlet pipe, and an air stop valve is arranged on a first air outlet pipe of the first heat exchange area; the utility model discloses do not change indoor heat exchanger's structure, utilize indoor heat exchanger body to come the refrigerant subcooling for before the indoor electronic expansion valve, the supercooling degree before promoting the interior valve reduces or eliminates refrigerant throttle abnormal sound, simultaneously, because the promotion of supercooling degree before the valve brings the promotion of refrigerating output.
Description
Technical Field
The utility model belongs to the technical field of the air conditioner, especially, relate to a multi-split air conditioning system.
Background
The multi-split air conditioning system comprises a plurality of indoor units which are used in parallel, wherein the indoor units perform refrigeration operation, and obvious indoor throttling noise can be generated when the degree of supercooling in front of a valve of an electronic expansion valve of each indoor unit is insufficient, namely the refrigerant in front of the valve is in a gas-liquid two-phase state. This problem has been one of the most feedback and difficult to solve in the market.
To solve the problem, the following scheme is adopted in the prior art:
1. the control parameter value of the supercooling degree before the electronic expansion valve is increased, so that the supercooling degree of the refrigerant is still maintained before the refrigerant reaches the expansion valve of the indoor unit after the refrigerant flows to overcome the on-way resistance loss and on-way heat loss of the pipeline;
2. the electronic expansion valve of the indoor unit is additionally wrapped by a damping block, so that the refrigerant throttling sound caused by the supercooling degree in front of the abnormal valve is reduced;
3. the brass parts are added in the field, and the purpose of reducing throttling sound is achieved by destroying the state of two-phase refrigerants in front of and behind the valve.
Although the above-mentioned solutions can reduce or eliminate the refrigerant throttling noise, they both require additional cost and are not suitable for all installation environments. When the individual indoor unit is used for long-distance cold conveying, the refrigerant before the electronic expansion valve of the indoor unit still has no supercooling degree due to the on-way resistance loss and the heat loss, so that the hidden trouble of generating refrigerant throttling sound still exists during the refrigerating operation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the technical problem of throttle sound is produced easily to above-mentioned many online air conditioning system's indoor set, provide one kind and can promote the preceding super-cooled rate of indoor set electronic expansion valve, reduce or eliminate many online air conditioning system of refrigerant throttle sound.
In order to achieve the above object, the utility model discloses a technical scheme be:
a multi-split air conditioning system, comprising:
the indoor unit group comprises a plurality of indoor units connected in parallel;
the indoor heat exchanger is arranged in the indoor unit and comprises a first heat exchange area with stronger heat exchange capacity and a second heat exchange area with weaker heat exchange capacity; the first heat exchange area is connected with the first liquid inlet pipe and the first gas outlet pipe, and the second heat exchange area is connected with the second liquid inlet pipe and the first liquid outlet pipe;
the liquid stop valve is arranged on the second liquid inlet pipe and is used for introducing a refrigerant into the second heat exchange area during refrigeration;
the indoor electronic expansion valve is arranged between the first liquid outlet pipe and the first liquid inlet pipe and is used for throttling the refrigerant led out from the second heat exchange area during refrigeration;
the air stop valve is arranged on a first air outlet pipe of the first heat exchange area and used for outputting a refrigerant of the first heat exchange area during refrigeration;
the refrigerant supplied by the outdoor unit is directly led into the second heat exchange area with weaker heat exchange capability from the liquid stop valve, a certain supercooling degree is obtained by heat exchange with the two-phase refrigerant throttled by the indoor electronic expansion valve, the refrigerant subcooled again flows out of the second heat exchange area, is throttled by the electronic expansion valve, is distributed to the first heat exchange area, and flows out of the indoor unit from the air stop valve after heat exchange with indoor air, so that the supercooling degree in front of the indoor unit valve is improved, and the refrigerant throttling abnormal sound is reduced or eliminated.
In some embodiments of the present application, the second heat exchange region is located at an edge of the indoor heat exchanger or in a region where a wind field is weak, and the remaining portion of the indoor heat exchanger is the first heat exchange region.
In some embodiments of the present disclosure, a state of the refrigerant flowing into the second heat exchange region is a liquid state.
In some embodiments of the present application, the first/second heat exchange area includes a plurality of U-shaped tubes and fins disposed on the U-shaped tubes.
In some embodiments of the present application, the first heat exchange area is provided with a plurality of first liquid inlet tubes.
In some embodiments of the present application, a separation capillary tube is disposed between the indoor electronic expansion valve and the first liquid inlet tube, and the flow dividing capillary tube passes through the flow dividing capillary tube and flows into the first heat exchange region through the liquid refrigerant throttled by the indoor electronic expansion valve, so as to achieve the purposes of evaporation heat exchange and cold output.
In some embodiments of the present application, the multi-split air conditioning system further includes an outdoor unit, and the outdoor unit includes a liquid storage tank, a compressor, an outdoor heat exchanger, and an outdoor electronic expansion valve, which are connected in sequence.
In some embodiments of the present application, the compressor reaches be connected with the cross valve between the outdoor heat exchanger, the cross valve still connect with the compressor reaches between the liquid storage pot, and the compressor with between the indoor unit, the refrigerant after the compressor will be in the liquid storage pot outdoor heat exchanger and convey between the indoor unit.
In some embodiments of the present application, when the indoor unit heats, the refrigerant flows into the first heat exchange area and the second heat exchange area from the gas stop valve, and then flows out from the liquid stop valve.
In some embodiments of the present application, when the indoor unit heats, the indoor electronic expansion valve has a larger opening degree, so that the effective heat exchange area is not sacrificed, and the heating effect of the indoor unit is kept unchanged.
Compared with the prior art, the utility model discloses an advantage lies in with positive effect:
1. the utility model discloses a many online air conditioning system do not change indoor heat exchanger's structure, utilize the indoor heat exchanger body to come the refrigerant subcooling for before the indoor electronic expansion valve, the refrigerant that supplies with the off-premises station directly introduces the second heat transfer district that heat transfer ability is weaker from the liquid stop valve, through carrying out the heat exchange with the two-phase state refrigerant after the throttle of indoor electronic expansion valve and acquire certain subcooling degree, the refrigerant of subcooling once more flows out the second heat transfer district, after the throttle through the electronic expansion valve, distribute to first heat transfer district, after the heat exchange with the indoor air, flow out the indoor set from the gas stop valve, the subcooling degree before promoting the indoor set valve, reduce or eliminate refrigerant throttle abnormal sound, and simultaneously, because the promotion of the subcooling degree before the valve, bring the promotion of;
2. the utility model discloses when heating the operation, the refrigerant flows in from the gas stop valve, and the liquid stop valve flows, equally divide and return the oil characteristic based on the refrigerant and consider, and middle electronic expansion valve has great aperture, guarantees not to sacrifice effective heat transfer area, guarantees promptly that the indoor set heats the effect and keeps unchangeable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a multi-connected air conditioning system according to an embodiment of the present invention;
fig. 2 is a refrigerant flow diagram of an indoor unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an indoor heat exchanger according to an embodiment of the present invention;
fig. 4 is a pressure enthalpy diagram according to an embodiment of the present invention;
in the above figures: 10. an outdoor unit; 11. a compressor; 12. a liquid storage tank; 13. an outdoor heat exchanger; 14. an outdoor electronic expansion valve; 15. a four-way valve; 20. an indoor unit; 21. an indoor electronic expansion valve; 22. An indoor heat exchanger; 221. a first heat transfer zone; 222. a second heat transfer area 2211 and a first liquid inlet pipe; 2212. A first air outlet pipe; 23. a liquid stop valve; 24 air stop valve.
Detailed Description
The present invention is specifically described below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For better understanding of the above technical solutions, the following detailed descriptions are provided with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, when the multi-split air conditioning system performs a cooling operation, a refrigerant is compressed into a high-pressure gas by a compressor 11, and then flows through an outdoor heat exchanger 13 to be condensed. In order to overcome the on-way resistance loss and ensure the transportation of cold energy, the refrigerant at the outlet of the outdoor heat exchanger 13 is generally required to have supercooling degrees, and the realization methods mainly comprise two methods, namely, the supercooling degree can be obtained through the supercooling of the heat exchanger, namely, a supercooling section is arranged at the bottom of the heat exchanger, so that the method has the advantages that the refrigeration can obtain some supercooling degrees, the ice accumulation at the bottom of the heating defrosting is ensured during the heating, and the heat exchange area of the outdoor heat exchanger 13 is a design value. The defects that the effective heat exchange area is sacrificed, and the supercooling degree is not obviously improved; and secondly, the subcooler is added to realize the refrigerant conveying with large supercooling degree through auxiliary equipment. However, since the indoor units of the multi-split air conditioning system are installed in various environments, it is not possible to ensure that all the supercooling degrees before reaching the indoor electronic expansion valve 21 are sufficient, and if the supercooling degree of the refrigerant before the valve of an individual indoor unit is 0K, throttling sound is inevitably generated.
To above-mentioned condition, guarantee indoor set 20 when the refrigeration operation, the promotion of the preceding super-cooled rate of start indoor set valve, the utility model provides a many online air conditioning system, as shown in fig. 1-3, include: the indoor unit set 20, the indoor unit set 10 includes a plurality of parallel indoor units, the indoor units are installed in different spaces for adjusting indoor temperature; an indoor heat exchanger 22 is arranged inside the indoor unit, the indoor heat exchanger 22 comprises two parts, namely a first heat exchange region 221 with strong heat exchange capacity and a second heat exchange region 222 with weak heat exchange capacity, the first heat exchange region 221 is connected with a first liquid inlet pipe 2211 and a first gas outlet pipe 2212, and the second heat exchange region 222 is connected with a second liquid inlet pipe 2221 and a first liquid outlet pipe 2222; the second liquid inlet pipe 2221 is provided with a liquid stop valve 23, and controls to introduce a refrigerant into the second heat transfer area 222 during refrigeration; an indoor electronic expansion valve 21 is arranged between the first liquid outlet pipe 2222 and the first liquid inlet pipe 2211, and when the indoor unit operates in a refrigerating mode, the indoor electronic expansion valve 21 throttles the refrigerant led out from the second heat exchange region 222; the first air outlet 2212 of the first heat exchange area 221 is provided with an air stop valve 24 for outputting the refrigerant of the first heat exchange area 221 during cooling.
The multi-split air conditioning system of the above embodiment does not change the structure of the indoor heat exchanger 22, the refrigerant before the indoor electronic expansion valve 21 is supercooled by the body of the indoor heat exchanger 22, the refrigerant supplied by the outdoor unit 10 is directly led from the liquid stop valve 23 to the second heat exchange region 222 with weaker heat exchange capability, a certain supercooling degree is obtained by heat exchange with the two-phase refrigerant throttled by the indoor electronic expansion valve 21, the supercooled refrigerant flows out of the second heat exchange region 222, is throttled by the electronic expansion valve 21, is distributed to the first heat exchange region 221, and flows out of the indoor unit from the air stop valve 24 after heat exchange with the indoor air, the degree of supercooling before the valve of the indoor electronic expansion valve 21 is increased, and the refrigerant throttling abnormal noise is reduced or eliminated.
During the cooling operation, the refrigerant flowing out of the outdoor unit 10 is a high-pressure medium-temperature liquid refrigerant according to the control requirement, but because the installation environment of the indoor unit is complex, and the on-way resistance loss and heat loss caused by the long-pipeline high drop are unavoidable, the degree of supercooling before reaching a certain indoor electronic expansion valve 21 is insufficient, and the throttling sound is abnormal and obvious. As shown in fig. 2, the second heat exchanging area 222 according to the embodiment of the present invention is located at the edge of the indoor heat exchanger 22 or at a region with a weak wind field, such as A, B, C, D in fig. 2, where the region is a region with a weak heat exchange on-hook, and the design position of the second heat exchanging area 222 of the indoor heat exchanger in the other forms, the size of the degree of supercooling required to be obtained, and the effective cooling capacity need to be considered comprehensively. The indoor heat exchanger 22 is provided with the second heat exchange area 222, the remaining part is the first heat exchange area 221 with strong heat exchange, the second heat exchange area 222 is positioned in the body of the indoor heat exchanger 22, a certain supercooling degree can be directly obtained from the first heat exchange area 221 with relatively low temperature through heat conduction of fins, and meanwhile, the purpose of cooling the refrigerant of the second heat exchange area 222 can be achieved through the circulating indoor air due to the low environment temperature of the whole indoor heat exchanger 22.
As can be seen from the pressure-enthalpy diagram shown in fig. 4, in the conventional air-conditioning cooling operation, the refrigerant first flows into the indoor expansion valve 21 after passing through the outdoor heat exchanger 13, and the degree of pre-valve supercooling SC of the indoor expansion valve 21 at this time becomes T(2-b)-T5At this time, the refrigerating capacity of the refrigerant per unit mass flow is set to point q ═ h(4-a)-h6(ii) a As refrigerant flow direction route for at first passing through the embodiment of the utility model provides a second heat transfer area 222 that heat transfer capacity is weaker, then pass through indoor electronic expansion valve 21, the degree of supercooling promotes before indoor expansion valve 21's the valve this moment, the degree of supercooling is SC ═ T(2-b)-T3When the refrigerating capacity of the refrigerant per unit mass is q ═ h(4-a)-h4I.e. the degree of supercooling increasesThe refrigerating capacity of the refrigerant with unit mass flow is improved, and after the degree of supercooling in front of the valve of the indoor expansion valve 21 is improved, the dryness of the refrigerant throttled behind the valve is reduced, so that the cold quantity carried by the refrigerant with unit mass flow is improved, the refrigerating effect of the indoor unit is improved, and the phenomenon that the indoor unit generates obvious throttling sound due to the two-phase refrigerant in front of the valve is avoided.
The refrigerant flowing into the second heat exchange region 222 from the liquid stop valve 23 is in a liquid state, and since the refrigerant in the second heat exchange region 222 is cooled, and the refrigerant flowing out of the second heat exchange region 222 through the first liquid outlet pipe 2222 is in a liquid state with an increased supercooling degree, the refrigerant state in the second heat exchange region 222 is in a liquid state, the supercooling degree in front of the indoor electronic expansion valve 21 is increased, and the refrigerant throttling noise is reduced or eliminated.
The indoor heat exchanger 22 is a structure that is common in the prior art, and includes a plurality of U-shaped tubes and fins disposed on the U-shaped tubes, so that the first heat exchange region 221 and the second heat exchange region 222 are also configured as U-shaped tubes and fins disposed on the U-shaped tubes, which facilitates heat conduction of a refrigerant.
In order to increase the heat exchange efficiency, the first heat exchange area 221 is provided with a plurality of first liquid inlet pipes 2211, a plurality of shunt capillaries (not shown in the figure) are arranged between the indoor electronic expansion valve 21 and the first liquid inlet pipes 2211, and the shunt capillaries enable the liquid refrigerant throttled by the indoor electronic expansion valve 21 to flow into the first heat exchange area 221 through each shunt capillary and the first liquid inlet pipe 2211 respectively, so that the purposes of evaporation heat exchange and cold output are achieved.
The multi-split air conditioning system further includes an outdoor unit 10, wherein the outdoor unit 10 includes a liquid storage tank 12, a compressor 11, an outdoor heat exchanger 13 and an outdoor electronic expansion valve 14 connected in sequence, and the connection relationship is known to those skilled in the art, and therefore, the present invention is not described herein again. A four-way valve 15 is connected between the compressor 11 and the outdoor heat exchanger 13, the four-way valve 15 is further connected between the compressor 11 and the liquid storage tank 12, and between the compressor 11 and the indoor unit 20, and transmits the refrigerant passing through the compressor 11 among the liquid storage tank 12, the outdoor heat exchanger 13 and the indoor unit 20.
In some embodiments, when the indoor unit 20 performs heating operation, the refrigerant flows in the direction opposite to that during cooling, flows into the first heat transfer region 221 and the second heat transfer region 222 from the air stop valve 24 in sequence, and then flows out from the liquid stop valve 23; based on the refrigerant equalization and oil return characteristics, the indoor electronic expansion valve has a larger opening degree, which is generally 80% -100% of the normal opening degree, for example, an electronic expansion valve of 480Pls, and the opening degree is about 400; the effective heat exchange area can not be sacrificed, and the heating effect of the indoor unit can be kept unchanged.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a many online air conditioning system which characterized in that: comprises that
The indoor unit group comprises a plurality of indoor units connected in parallel;
the indoor heat exchanger is arranged in the indoor unit and comprises a first heat exchange area with stronger heat exchange capacity and a second heat exchange area with weaker heat exchange capacity, the first heat exchange area is connected with a first liquid inlet pipe and a first gas outlet pipe, and the second heat exchange area is connected with a second liquid inlet pipe and a first liquid outlet pipe;
the liquid stop valve is arranged on the second liquid inlet pipe and is used for introducing a refrigerant into the second heat exchange area during refrigeration;
the indoor electronic expansion valve is arranged between the first liquid outlet pipe and the first liquid inlet pipe and is used for throttling the refrigerant led out from the second heat exchange area during refrigeration;
and the air stop valve is arranged on the first air outlet pipe of the first heat exchange area and used for outputting the refrigerant of the first heat exchange area during refrigeration.
2. The multi-split air conditioning system as claimed in claim 1, wherein the second heat exchange area is located at an edge of the indoor heat exchanger or a region where a wind field is weak, and the remaining part of the indoor heat exchanger is the first heat exchange area.
3. A multi-split air conditioning system as claimed in claim 1, wherein the refrigerant state of the second heat exchange area is a liquid state.
4. A multi-split air conditioning system as recited in claim 1, wherein the first/second heat exchange areas include a plurality of U-shaped tubes and fins provided on the U-shaped tubes.
5. A multi-split air conditioning system as claimed in claim 1, wherein the first heat exchange area is provided with a plurality of first liquid inlet pipes.
6. A multi-split air conditioning system as claimed in claim 5, wherein a bypass capillary tube is disposed between the indoor electronic expansion valve and the first liquid inlet tube, and the bypass capillary tube allows the liquid refrigerant throttled by the indoor electronic expansion valve to flow into the first heat exchange region through the bypass capillary tube and the first liquid inlet tube, respectively.
7. The multi-split air conditioning system as claimed in claim 1, further comprising an outdoor unit, wherein the outdoor unit comprises a liquid storage tank, a compressor, an outdoor heat exchanger and an outdoor electronic expansion valve connected in sequence.
8. A multi-split air conditioning system as claimed in claim 7, wherein a four-way valve is connected between the compressor and the outdoor heat exchanger, and the four-way valve is further connected between the compressor and the liquid storage tank, and between the compressor and the indoor unit, and transfers the refrigerant passing through the compressor among the liquid storage tank, the outdoor heat exchanger, and the indoor unit.
9. A multi-split air conditioning system as claimed in claim 1, wherein, when the indoor units perform heating operation, a refrigerant flows into the first heat exchange region and the second heat exchange region from the air cut-off valve and then flows out from the liquid cut-off valve.
10. The multi-split air conditioning system as claimed in claim 9, wherein the indoor electronic expansion valve has a large opening degree when the indoor unit is operated for heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020319663.0U CN212006013U (en) | 2020-03-13 | 2020-03-13 | Multi-split air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020319663.0U CN212006013U (en) | 2020-03-13 | 2020-03-13 | Multi-split air conditioning system |
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| CN212006013U true CN212006013U (en) | 2020-11-24 |
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| CN202020319663.0U Active CN212006013U (en) | 2020-03-13 | 2020-03-13 | Multi-split air conditioning system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623767A (en) * | 2021-08-12 | 2021-11-09 | 珠海格力节能环保制冷技术研究中心有限公司 | Control method and device of air conditioner, storage medium and processor |
| CN114484944A (en) * | 2022-03-22 | 2022-05-13 | 珠海格力电器股份有限公司 | Self-supercooling structure and air conditioner |
-
2020
- 2020-03-13 CN CN202020319663.0U patent/CN212006013U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623767A (en) * | 2021-08-12 | 2021-11-09 | 珠海格力节能环保制冷技术研究中心有限公司 | Control method and device of air conditioner, storage medium and processor |
| CN114484944A (en) * | 2022-03-22 | 2022-05-13 | 珠海格力电器股份有限公司 | Self-supercooling structure and air conditioner |
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