CN219177868U - Variable-frequency four-pipe air conditioning system - Google Patents
Variable-frequency four-pipe air conditioning system Download PDFInfo
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- CN219177868U CN219177868U CN202223190709.1U CN202223190709U CN219177868U CN 219177868 U CN219177868 U CN 219177868U CN 202223190709 U CN202223190709 U CN 202223190709U CN 219177868 U CN219177868 U CN 219177868U
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- 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 variable-frequency four-pipe air conditioning system, which comprises a compressor, a four-way valve, a finned tube heat exchange assembly, a heat exchange module, a gas-liquid separator and a throttling module, wherein a D port of the four-way valve is connected with an exhaust port of the compressor through a copper pipe; the C port of the four-way valve is connected with the fin tube heat exchange device through a copper pipe; the S port of the four-way valve is connected with the gas-liquid separator through a copper pipe; the E port of the four-way valve is connected with the heat exchange module through a copper pipe, and the throttling module is arranged between the fin tube heat exchange module and the heat exchange module. The utility model has the beneficial effects that: the variable-frequency four-pipe air conditioning system adopts the variable-frequency compressor and the hot water recoverer, and adopts different electromagnetic valves and one-way valves to change the flow direction of the refrigerant, so as to realize the full utilization of heat of the air conditioning system and effectively improve COP (coefficient of performance) of the unit under partial load, and the unit has four running modes of refrigeration, heating, hot water, refrigeration and heating.
Description
Technical Field
The utility model belongs to the field of variable frequency air conditioning systems, and particularly relates to a variable frequency four-pipe air conditioning system.
Background
The finned tube heat exchange coil is one of important parts of an air-cooled heat pump, but the air speed at the bottom of the coil is low during heating in winter, and defrosting condensate water is easy to accumulate at the bottom of the coil in the process of discharging to form secondary frosting. The frosting at the bottom of the coil gradually reduces the evaporating pressure of the evaporating coil, so that the heat exchange efficiency is reduced, and the efficient operation of heating in winter of the unit is not facilitated.
The common compressor of the air-cooled heat pump is a fixed-frequency compressor, and because the compressor cannot be unloaded, the load can be maintained only by opening or closing the compressor, so that on one hand, the fluctuation of the outlet water temperature of the system is larger, and on the other hand, the compressor runs at full load all the time, and the heat exchange area of the two compressors cannot be fully utilized to effectively improve the nominal working condition performance coefficient (Coefficient of Performance, COP) of the unit partial load.
Disclosure of Invention
In view of the above, the utility model aims to provide a variable-frequency four-pipe air conditioning system so as to realize the full utilization of heat of the air conditioning system, effectively improve COP under partial load of a unit, and solve the problem of heating and frosting at the bottom of a coil in winter, and effectively improve winter heating performance of the unit.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
a variable-frequency four-pipe air conditioning system comprises a compressor, a four-way valve, a finned tube heat exchange assembly, a heat exchange module, a gas-liquid separator and a throttling module,
the port D of the four-way valve is connected with an exhaust port of the compressor through a copper pipe;
the C port of the four-way valve is connected with the fin tube heat exchange exchanger component through a copper pipe;
the S port of the four-way valve is connected with the gas-liquid separator through a copper pipe;
the E port of the four-way valve is connected with the heat exchange module through a copper pipe,
the throttling module is disposed between the finned tube heat exchanger assembly and the heat exchange module.
Further, the throttle die comprises a first valve and a fourth valve,
the first valve and the fourth valve are arranged between the fin tube heat exchange assembly and the heat exchange module.
Further, the finned tube heat exchanger assembly comprises two finned tube heat exchangers, wherein each finned tube heat exchanger is provided with a collecting and separating tube, a liquid separator, a supercooling section lower interface and a supercooling section upper interface,
the C port of the four-way valve is connected with the collecting and distributing pipe through a copper pipe;
the first valve is arranged between the liquid distributor and the upper interface of the supercooling section;
the fourth valve is arranged between the lower interface of the supercooling section and the heat exchange module.
Further, the heat exchanger further comprises an axial flow fan which is arranged on the fin tube heat exchange assembly.
Further, the heat exchange module comprises a first heat exchanger and a second heat exchanger, wherein the first heat exchanger is a water heater; the second heat exchanger is a heat exchanger for an air conditioner.
Further, the valve module comprises a second valve, a third valve, a fifth valve, a sixth valve, a seventh valve and an eighth valve,
the second valve is connected with the liquid distributor through a copper pipe;
the third valve is connected with the lower interface of the supercooling section through a copper pipe;
the fifth valve is arranged between the third valve and the first heat exchanger;
the sixth valve is arranged between the first heat exchanger and the four-way valve;
the seventh valve is arranged between the second heat exchanger and the four-way valve;
the eighth valve is arranged between the second heat exchanger and the gas-liquid separator.
Further, the filter module comprises a first filter and a second filter,
the first filter is connected with the upper interface of the supercooling section through a copper pipe;
the second filter is arranged between the third valve and the fourth valve.
Further, the filter also comprises a one-way valve which is arranged between the second filter and the second heat exchanger.
Further, the heat exchanger further comprises a balance tank which is arranged between the fifth valve and the first heat exchanger.
Further, the compressor is a variable frequency scroll compressor.
Compared with the prior art, the variable-frequency four-pipe air conditioning system has the following beneficial effects:
(1) According to the variable-frequency four-pipe air conditioning system, the variable-frequency compressor and the hot water recoverer are adopted, and the flow direction of the refrigerant is changed by adopting different electromagnetic valves and one-way valves, so that the full utilization of heat of the air conditioning system is realized, the COP (coefficient of performance) of a unit under partial load is effectively improved, and the unit has four running modes of refrigeration, heating, hot water and refrigeration and heating;
(2) According to the variable-frequency four-tube air conditioning system, the front cooling section of the heating valve is arranged at the bottom of the finned tube heat exchanger of the air conditioning system, so that the problem of heating and frosting at the bottom of the coil in winter is solved, and the winter heating performance of a unit is effectively improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
FIG. 1 is a flow chart of a variable frequency four-pipe air conditioning system according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a heat exchanger assembly of a finned tube for a variable frequency four-tube air conditioning system in accordance with an embodiment of the present utility model;
FIG. 3 is a flow chart of a refrigeration mode of a variable frequency four-pipe air conditioning system according to an embodiment of the utility model;
fig. 4 is a flow chart of a heating mode of a variable frequency four-pipe air conditioning system according to an embodiment of the present utility model;
FIG. 5 is a flow chart of a hot water mode of a variable frequency four-pipe air conditioning system according to an embodiment of the present utility model;
fig. 6 is a flow chart of a cooling and heating mode of a variable frequency four-pipe air conditioning system according to an embodiment of the utility model.
Reference numerals illustrate:
1-a compressor; 2-four-way valve; a 3-fin tube heat exchanger assembly; 31-collecting and separating pipes; 32-knockout; 33-subcooling section lower interface; 34-an upper interface of the supercooling section; 4-an axial flow fan; 5-a first valve; 6-a second valve; 7-a first filter; 8-a third valve; 9-a second filter; 10-a one-way valve; 11-fourth valve; 12-a fifth valve; 13-balancing tank; 14-a first heat exchanger; 15-a second heat exchanger; 16-sixth valve; 17-seventh valve; 18-eighth valve; 19-a gas-liquid separator.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
The utility model will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, fig. 1 is a flowchart of a variable frequency four-pipe air conditioning system according to an embodiment of the present utility model.
The utility model relates to a variable-frequency four-pipe air conditioning system, which comprises a compressor 1, a four-way valve 2, a finned tube heat exchange assembly, a heat exchange module, a gas-liquid separator 19 and a throttling module,
the D port of the four-way valve 2 is connected with the exhaust port of the compressor 1 through a copper pipe;
the C port of the four-way valve 2 is connected with the fin tube heat exchange exchanger component through a copper pipe;
the S port of the four-way valve 2 is connected with the gas-liquid separator 19 through a copper pipe;
the E port of the four-way valve 2 is connected with the heat exchange module through a copper pipe,
the throttling module is disposed between the finned tube heat exchanger assembly and the heat exchange module.
The throttle die comprises a first valve 5 and a fourth valve 11,
the first valve 5 and the fourth valve 11 are arranged between the fin tube heat exchange assembly and the heat exchange module.
Referring to fig. 2, fig. 2 is a schematic diagram of a fin tube heat exchanger assembly 3 of a variable frequency four-tube air conditioning system according to an embodiment of the present utility model
The finned tube heat exchanger assembly 3 comprises two finned tube heat exchangers, wherein each finned tube heat exchanger is provided with a collecting and distributing tube 31, a liquid distributor 32, a supercooling section lower interface 33 and a supercooling section upper interface 34,
the C port of the four-way valve 2 is connected with the collecting and distributing pipe 31 through a copper pipe;
the first valve 5 is arranged between the liquid separator 32 and the upper interface 34 of the supercooling section;
the fourth valve 11 is disposed between the subcooling section lower port 33 and the heat exchange module.
The utility model relates to a variable-frequency four-pipe air conditioning system, which also comprises an axial flow fan 4, wherein the axial flow fan is arranged on the fin pipe heat exchange exchanger component 3.
Further, the heat exchange module comprises a first heat exchanger 14 and a second heat exchanger 15, wherein the first heat exchanger 14 is a water heater; the second heat exchanger 15 is a heat exchanger for an air conditioner.
The utility model relates to a variable frequency four-pipe air conditioning system, which also comprises a valve module, wherein the valve module comprises a second valve 6, a third valve 8, a fifth valve 12, a sixth valve 16, a seventh valve 17 and an eighth valve 18,
the second valve 6 is connected with the liquid separator 32 through copper pipes;
the third valve 8 is connected with the supercooling section lower interface 33 through a copper pipe;
the fifth valve 12 is arranged between the third valve 8 and the first heat exchanger 14;
the sixth valve 16 is disposed between the first heat exchanger 14 and the four-way valve 2;
the seventh valve 17 is disposed between the second heat exchanger 15 and the four-way valve 2;
the eighth valve 18 is disposed between the second heat exchanger 15 and the gas-liquid separator 19.
The utility model relates to a variable-frequency four-pipe air conditioning system, which also comprises a filtering module, wherein the filtering module comprises a first filter 7 and a second filter 9,
the first filter 7 is connected with the upper interface 34 of the supercooling section through a copper pipe;
the second filter 9 is arranged between the third valve 8 and the fourth valve 11.
The variable-frequency four-pipe air conditioning system further comprises a one-way valve 10 arranged between the second filter 9 and the second heat exchanger 15.
The variable-frequency four-pipe air conditioning system of the utility model further comprises a balance tank 13 arranged between the fifth valve 12 and the first heat exchanger 14.
Further, the compressor 1 is a variable frequency scroll compressor.
As shown in fig. 3, fig. 3 is a flow chart of a refrigerating mode of a variable-frequency four-pipe air conditioning system according to an embodiment of the utility model.
In one embodiment of the present utility model, in the operation mode, the four-way valve 2 is not powered, the exhaust port of the compressor 1 is communicated with the port of the four-way valve 2C, the fifth valve 12, the sixth valve 16 and the eighth valve 18 are powered off and are not conductive, the refrigerant does not pass through the first heat exchanger 14, and only the second heat exchanger 15 is used for preparing air-conditioning cold water. The method comprises the following steps: the compressor 1 discharges high-temperature and high-pressure overheated refrigerant, the overheated gaseous refrigerant is evenly distributed after being evenly divided into two paths through a C port of the four-way valve 2 and enters a collecting and separating pipe 31 of the fin heat exchanger assembly, the overheated gaseous refrigerant transfers heat to a fin coil and transfers heat to surrounding air through an axial flow fan 4, the refrigerant becomes supercooled medium-temperature and high-pressure liquid refrigerant, the supercooled medium-temperature and high-pressure liquid refrigerant sequentially flows back into a knockout 32 and flows out to be combined with the refrigerant of the two heat exchangers again, and the combined liquid refrigerant sequentially passes through a second valve 6 and a first filter 7 and then enters the bottom of the fin tube heat exchanger assembly 3 through an upper interface 34 of a supercooling section to be supercooled for the second time. The liquid refrigerant after the cooling flows out from the lower interface 33 of the supercooling section, flows through the third valve 8 and the second filter 9 in sequence, then enters the fourth valve 11 for throttling, and the opening degree of the fourth valve 11 is judged according to the overheat degree of the air suction port of the compressor 1. The refrigerant is throttled by the fourth valve 11 to become a low-temperature low-pressure two-phase refrigerant, then enters the second heat exchanger 15, absorbs the heat of chilled water and prepares air-conditioning cold water, then the refrigerant becomes a superheated low-temperature low-pressure gaseous refrigerant, sequentially flows through the E port and the S port of the four-way valve 2, returns to the gas-liquid separator 19, and then returns to the compressor 1 under the suction action of the compressor 11 to perform the next cycle.
As shown in fig. 4, fig. 4 is a flow chart of a heating mode of a variable frequency four-pipe air conditioning system according to an embodiment of the utility model.
In one embodiment of the present utility model, in the operation mode, the four-way valve 2 is powered, the exhaust port of the compressor 1 is communicated with the port of the four-way valve 2E, the fourth valve 11, the fifth valve 12, the sixth valve 16 and the eighth valve 18 are powered off and are not conductive, and the refrigerant does not pass through the first heat exchanger 14, and only the second heat exchanger 15 is used for preparing air-conditioning hot water. The method comprises the following steps: the compressor 1 discharges high-temperature and high-pressure overheated refrigerant, the overheated refrigerant enters the second heat exchanger 15 through the E port of the four-way valve 2 and the seventh valve 17, heat is transferred to cooling water to prepare air-conditioning hot water, the refrigerant turns into supercooled liquid refrigerant with medium temperature and high pressure after releasing heat and flows out of the outlet of the second heat exchanger 15, the refrigerant sequentially passes through the one-way valve 10 and the third valve 8, the refrigerant is divided into two parts before entering a coil, and the refrigerant enters the two fin tube heat exchangers through the lower interfaces 33 of the two supercooling sections at the bottom of the fin tube heat exchanger component 3 respectively. The middle-temperature high-pressure supercooled liquid refrigerant releases heat to the surrounding air in the supercooling section, flows out from the upper interface 34 of the supercooling section, then flows through the first filter 7 and the first valve 5 in sequence, and is throttled in the first valve 5, and the opening degree of the first valve 5 is controlled according to the superheat degree of the air suction port temperature of the compressor 1. After throttling, the refrigerant is changed into a low-temperature low-pressure two-phase refrigerant, enters the liquid separator 32 to be equally divided into liquid and evaporate and absorb heat of surrounding environment for each loop, and becomes a superheated low-temperature low-pressure gaseous refrigerant, the superheated low-temperature low-pressure gaseous refrigerant is merged and flows out by the collecting and distributing pipe 31 and then enters the C port of the four-way valve 2, then returns to the gas-liquid separator 19 from the S port, enters the compressor 1 under the suction effect of the compressor 1 and is subjected to the next cycle.
As shown in fig. 5, fig. 5 is a flowchart of a hot water mode of a variable frequency four-pipe air conditioning system according to an embodiment of the present utility model.
In one embodiment of the present utility model, the hot water mode switches the second heat exchanger 15 to the first heat exchanger 14, unlike the heating mode. In the operation mode, the four-way valve 2 is powered on, the exhaust port of the compressor 1 is communicated with the port of the four-way valve 2E, the fourth valve 11 is closed to 0pps, the seventh valve 17 and the eighth valve 18 are powered off and are not conducted, and the refrigerant does not pass through the second heat exchanger 15 and only passes through the first heat exchanger 14 to prepare domestic hot water for use. The method comprises the following steps: the compressor 1 discharges high-temperature and high-pressure overheated refrigerant, the overheated refrigerant enters the first heat exchanger 14 through the E port of the four-way valve 2 and the sixth valve 16, heat is transferred to cooling water to prepare domestic hot water, the refrigerant is changed into middle-temperature and high-pressure supercooled liquid refrigerant after releasing heat and flows out of the outlet of the first heat exchanger 14, at the moment, redundant liquid refrigerant enters the balance tank 13 under the action of pressure difference, other liquid refrigerants in a main path sequentially pass through the fifth valve 12 and the third valve 8 and are divided into two before entering a coil, and the two liquid refrigerants enter two fin tube heat exchangers respectively through the lower interfaces 33 of two supercooling sections at the bottom of the fin tube heat exchanger component 3. The middle-temperature high-pressure supercooled liquid refrigerant releases heat to the surrounding air in the supercooling section, flows out from the upper interface 34 of the supercooling section, then flows through the first filter 7 and the first valve 5 in sequence, and is throttled in the first valve 5, and the opening degree of the first valve 5 is controlled according to the superheat degree of the air suction port temperature of the compressor 1. After throttling, the refrigerant is changed into a low-temperature low-pressure two-phase refrigerant, enters the liquid separator 32 to be equally divided into liquid and evaporate and absorb heat of surrounding environment for each loop, and becomes a superheated low-temperature low-pressure gaseous refrigerant, the superheated low-temperature low-pressure gaseous refrigerant is merged and flows out by the collecting and distributing pipe 31 and then enters the C port of the four-way valve 2, then returns to the gas-liquid separator 19 from the S port, enters the compressor 1 under the suction effect of the compressor 1 and is subjected to the next cycle.
As shown in fig. 6, fig. 6 is a flow chart of a cooling and heating mode of a variable frequency four-pipe air conditioning system according to an embodiment of the utility model.
In one embodiment of the present utility model, in the operation mode, the refrigerant does not pass through the fin tube heat exchanger assembly 3, the four-way valve 2 is powered on, the exhaust port of the compressor 1 is communicated with the port of the four-way valve 2E, the first valve 5, the second valve 6, the third valve 8 and the seventh valve 17 are powered off and are not conducted, the refrigerant is used for preparing domestic hot water through the first heat exchanger 14, and the second heat exchanger 15 is used for preparing air-conditioning cold water. The method comprises the following steps: the compressor 1 discharges high-temperature and high-pressure overheated refrigerant, enters the first heat exchanger 14 through the E port of the four-way valve 2 and the sixth valve 16, transfers heat to cooling water to prepare domestic hot water, the refrigerant is changed into middle-temperature and high-pressure supercooled liquid refrigerant after releasing heat, and flows out of the outlet of the first heat exchanger 14, at the moment, the redundant liquid refrigerant enters the balance tank 13 under the action of pressure difference, other liquid refrigerants of a main path sequentially pass through the fifth valve 12 and the second filter 9 and then enter the fourth valve 11 to throttle, and the opening degree of the fourth valve 11 is judged according to the overheat degree of the air suction port of the compressor 1. The refrigerant is throttled by the fourth valve 11 to become a low-temperature low-pressure two-phase refrigerant, then enters the second heat exchanger 15, absorbs the heat of chilled water and prepares air-conditioning cold water, then the refrigerant becomes a superheated low-temperature low-pressure gaseous refrigerant which flows out from the outlet of the second heat exchanger 15, then returns to the gas-liquid separator 19 through the eighth valve 18, enters the compressor 1 under the suction action of the compressor 1 and is subjected to the next cycle.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model, and are intended to be included within the scope of the appended claims and description.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. A four pipe system air conditioning system of frequency conversion, its characterized in that: comprises a compressor (1), a four-way valve (2), a finned tube heat exchange assembly (3), a heat exchange module, a gas-liquid separator (19) and a throttling module,
the D port of the four-way valve (2) is connected with the exhaust port of the compressor (1) through a copper pipe;
the C port of the four-way valve (2) is connected with the fin tube heat exchange heat exchanger component (3) through a copper pipe;
the S port of the four-way valve (2) is connected with the gas-liquid separator (19) through a copper pipe;
the E port of the four-way valve (2) is connected with the heat exchange module through a copper pipe,
the throttling module is arranged between the fin tube heat exchange assembly (3) and the heat exchange module.
2. A variable frequency four-pipe air conditioning system according to claim 1, wherein: the throttle die comprises a first valve (5) and a fourth valve (11),
the first valve (5) and the fourth valve (11) are arranged between the fin tube heat exchange assembly (3) and the heat exchange module.
3. A variable frequency four-pipe air conditioning system according to claim 2, wherein: the finned tube heat exchanger assembly (3) comprises two finned tube heat exchangers, wherein each finned tube heat exchanger is provided with a collecting and separating tube (31), a liquid separator (32), a supercooling section lower interface (33) and a supercooling section upper interface (34),
the C port of the four-way valve (2) is connected with the collecting and separating pipe (31) through a copper pipe;
the first valve (5) is arranged between the liquid separator (32) and the upper interface (34) of the supercooling section;
the fourth valve (11) is arranged between the supercooling section lower interface (33) and the heat exchange module.
4. A variable frequency four-pipe air conditioning system according to claim 1, wherein: the heat exchange device also comprises an axial flow fan (4) which is arranged on the fin tube heat exchange device (3).
5. A variable frequency four-pipe air conditioning system according to claim 3, wherein: the heat exchange module comprises a first heat exchanger (14) and a second heat exchanger (15), wherein the first heat exchanger (14) is a water heater; the second heat exchanger (15) is a heat exchanger for an air conditioner.
6. A variable frequency four-pipe air conditioning system according to claim 5, wherein: the valve module comprises a second valve (6), a third valve (8), a fifth valve (12), a sixth valve (16), a seventh valve (17) and an eighth valve (18),
the second valve (6) is connected with the liquid separator (32) through a copper pipe;
the third valve (8) is connected with the lower interface (33) of the supercooling section through a copper pipe;
the fifth valve (12) is arranged between the third valve (8) and the first heat exchanger (14);
the sixth valve (16) is arranged between the first heat exchanger (14) and the four-way valve (2);
the seventh valve (17) is arranged between the second heat exchanger (15) and the four-way valve (2);
the eighth valve (18) is arranged between the second heat exchanger (15) and the gas-liquid separator (19).
7. A variable frequency four-pipe air conditioning system according to claim 6, wherein: also comprises a filter module, wherein the filter module comprises a first filter (7) and a second filter (9),
the first filter (7) is connected with the upper interface (34) of the supercooling section through a copper pipe;
the second filter (9) is arranged between the third valve (8) and the fourth valve (11).
8. A variable frequency four-pipe air conditioning system according to claim 7, wherein: the device also comprises a one-way valve (10) which is arranged between the second filter (9) and the second heat exchanger (15).
9. A variable frequency four-pipe air conditioning system according to claim 6, wherein: the balance tank (13) is arranged between the fifth valve (12) and the first heat exchanger (14).
10. A variable frequency four-pipe air conditioning system according to claim 1, wherein: the compressor (1) is a variable frequency scroll compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223190709.1U CN219177868U (en) | 2022-11-30 | 2022-11-30 | Variable-frequency four-pipe air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223190709.1U CN219177868U (en) | 2022-11-30 | 2022-11-30 | Variable-frequency four-pipe air conditioning system |
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| Publication Number | Publication Date |
|---|---|
| CN219177868U true CN219177868U (en) | 2023-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223190709.1U Active CN219177868U (en) | 2022-11-30 | 2022-11-30 | Variable-frequency four-pipe air conditioning system |
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| Country | Link |
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| CN (1) | CN219177868U (en) |
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- 2022-11-30 CN CN202223190709.1U patent/CN219177868U/en active Active
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