CN1536317A - Refrigerant flow-guiding device for heat exchanger - Google Patents
Refrigerant flow-guiding device for heat exchanger Download PDFInfo
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- CN1536317A CN1536317A CNA031096972A CN03109697A CN1536317A CN 1536317 A CN1536317 A CN 1536317A CN A031096972 A CNA031096972 A CN A031096972A CN 03109697 A CN03109697 A CN 03109697A CN 1536317 A CN1536317 A CN 1536317A
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Abstract
The present invention provides a refrigerant flow guide device for heat exchanger. It includes first mother tube, second mother tube and several dividers. The interior of the described first mother tube and second mother tube is equipped with longitudinal segregation barrier respectively, and said interior can be separated into front segregation space and rear segregation space respectively, and every divider also can be separated into rear refrigerant channel and front refrigerant channel respectively, and the number of microfine tubes contained in the rear refrigerant channel and the number of microfine tubes contained in the front refrigerant channel are identical. Said invention can raise heat exchange efficiency of heat exchanger, and its structure is simple, and its assembly efficiency also can be raised.
Description
Technical field
The present invention relates to a kind of heat exchanger, particularly relate to a kind of refrigerant guiding device of heat exchanger.
Background technology
In general, in household electrical appliance such as refrigerator and air-conditioner, form a refrigerating circulation system by parts such as compressor, condenser, expansion valve and evaporimeters, condenser and evaporimeter in this refrigerating circulation system are commonly referred to as heat exchanger.In heat exchanger, refrigerant is changed to gaseous state to liquid state or from liquid state from gaseous state, produces the neither endothermic nor exothermic phenomenon in the said process, thereby carries out heat exchange with surrounding air, reaches the purpose of refrigeration and pyrogenicity.
Above-mentioned heat exchanger can be divided into following several types by its design feature: " fin-type " heat exchanger of the refrigerator that is widely used, its design feature are that the refrigerant pipe is provided with several cooling fins.In this heat exchanger, refrigerant circulates along the refrigerant pipe, carries out heat exchange by refrigerant tube wall and cooling fin and surrounding air simultaneously.Be arranged on cooling fin on the refrigerant pipe and enlarged contact area with surrounding air, thereby improved heat exchanger effectiveness to greatest extent.
Plate heat exchanger, its design feature are to form coolant path in plate shaped pipeline, and refrigerant circulates in these coolant paths, carry out heat exchange by the tube wall and the surrounding air of plate shaped pipeline simultaneously.
Fine tube type heat exchanger, its design feature is in the refrigerant porch and the refrigerant exit place is provided with the female pipe of inlet of refrigerant respectively and outlet is female manages, at the female pipe of inlet with export and be provided with the refrigerant distribution that several are parallel to each other between female pipe evenly and at intervals, these isocons also are communicated with female the pipe with the female pipe of outlet is vertical mutually of inlet, be formed with several fine refrigerant pipes in the isocon, from female pipe that enters the mouth flow into refrigerant, be diverted to each isocon, be flowed to the female pipe of outlet then, discharge from the outlet that exports female pipe.
The concrete structure of existing fine tube type heat exchanger is as shown in Figure 1 and Figure 2:
Described fine tube type heat exchanger comprises: female pipe 1, female pipe 2, several isocons that are uniformly laterally arranged at interval 3 and be arranged on undaform cooling fin 4 between each isocon 3.Described female pipe 1 and female pipe 2 are connected with inlet with compressor outlet respectively, and refrigerant is flowed to and femalely manages 2 after mother manages 1 fine refrigerant pipe shunting to each isocon 3.The two ends of described isocon 3 respectively with mother manage 1 and female pipe 2 is connected and with mother manage 1 and female pipe 2 perpendicular; Described cooling fin 4 is undaform, is separately positioned between each isocon 3; The wave crest point of cooling fin 4 contacts with the tube wall of the isocon 3 that is positioned at its both sides respectively, to increase heat exchange area.
Described female pipe 1 is the pipe that an end seals, internal diameter is identical with female pipe 2.
Described isocon 3 inside are formed with the microtubule (not shown) that several are used for shunting refrigerant.The section configuration of isocon 3 is a rectangle.The two ends of isocon 3 are inserted respectively and are communicated with female pipe 1 and female pipe 2, and with mother manage 1 and female pipe 2 be welded as a whole.
Described cooling fin 4 is formed by strip thin aluminium strip bending machining.
The course of work to above-mentioned existing fine tube type heat exchanger is illustrated below:
When existing fine tube type heat exchanger is used as condenser, shown in the dotted arrow among Fig. 2, refrigerant is managed after 2 upper end edge gravity direction flows into from mother, carry out heat exchange by isocon 3 tube walls and cooling fin 4 with surrounding air when flowing through each isocon 3, meanwhile, refrigerant becomes liquid state from gaseous state, and liquid refrigerants is managed in 1 mother and converged, and flows to the expansion valve in the refrigerating system.
When existing fine tube type heat exchanger is used as evaporimeter, shown in solid arrow among Fig. 2, refrigerant is managed from mother after 1 lower end flows into against gravity direction, when flowing through each isocon 3, carry out heat exchange by isocon 3 tube walls and cooling fin 4 with surrounding air, meanwhile, refrigerant becomes gaseous state from liquid state, gaseous coolant is managed 2 mother and is converged, and flows to the compressor in the refrigerating system.
In addition, described female pipe 1 and female pipe 2 sizes according to heat exchanger both can have been made simple cylindrical shape as shown in Figure 2, also can in the centre of the female pipe of cylindrical shape horizontal division board 5 be set as shown in Figure 3.Reason is as follows: for small heat-exchanger, refrigerant is even substantially in the pressure distribution that mother manages in 1, during therefore used as evaporimeter, is the gas-liquid mixed state even flow into the refrigerant of female pipe 1, also can evenly be diverted to this refrigerant in each isocon.But for large-scale heat exchanger, the refrigerant of gas-liquid mixed state is just inhomogeneous in the pressure distribution that mother manages in 1, thereby causes the inhomogeneous of coolant distribution amount in each isocon.
Therefore, as shown in Figure 3, for large-scale heat exchanger, the middle part of female pipe 1 and female pipe 2 is provided with horizontal division board 5, suitably divides the inner space of female pipe 1 and female pipe 2, improves refrigerant pressure.Like this, not only can evenly shunt gas-liquid mixed attitude refrigerant, can also improve the flow velocity of refrigerant, thereby improve compressor performance.
But, there is following problem in above-mentioned existing fine tube type heat exchanger: because the refrigerant in female pipe 1 or the female pipe 2 is diverted in the microtubule in each isocon 3 simultaneously, gaseous coolant will cause to flow into isocon 3 refrigerants that are positioned at female pipe top are positioned at the terminal isocon 3 of female pipe more than inflow refrigerant when isocon 3 shuntings; In addition, refrigerant only carries out one time heat exchanging process in heat exchanger, and the efficient of whole heat exchanger is not high.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the above-mentioned shortcoming of existing fine tube type heat exchanger, and a kind of refrigerant guiding device that refrigerant in female pipe can be diverted to each isocon equably and carry out the heat exchanger of twice heat exchanging process is provided.
In order to solve the problems of the technologies described above, the technical scheme that the refrigerant guiding device of heat exchanger of the present invention adopts is: the fine tube type heat exchanger with refrigerant guiding device of heat exchanger of the present invention comprises: the 1st female pipe, the 2nd female pipe, several isocons, several cooling fins, vertical division board and horizontal division board; The described the 2nd female Guan Yudi 1 female pipe be arranged in parallel and with perpendicular to the ground, the 1st female pipe is connected with the compressor of refrigerating system by the refrigerant pipe; The end face bore of described isocon is a rectangle, these isocons are set in parallel between the 1st female Guan Hedi 2 female pipes evenly and at intervals and manage perpendicular with the 1st female Guan Hedi 2 mothers, the two ends of isocon are connected with the 1st female Guan Hedi 2 female pipes respectively, its effect is the refrigerant in shunting the 1st female pipe, the refrigerant that flows out from isocon converges to after the 2nd female pipe, flow back into again in the 1st female pipe.
Described cooling fin is undaform, is arranged between each isocon, and its wave crest point contacts with the tube wall of isocon respectively, to increase the heat exchange area of heat exchanger and surrounding air.
Being provided with vertical division board in the described the 1st female Guan Hedi 2 female pipes, is benchmark with the mobile direction of surrounding air, and vertical division board is separated into preceding insulating space and back insulating space with the inner space of the 1st female Guan Hedi 2 female pipes respectively.
For large-scale heat exchanger, described cylindrical shape the 1st female pipe inside also is provided with horizontal division board, horizontal division board the cross-section fully the 1st female pipe, horizontal division board be shaped as circular slab, its radius equates substantially with the internal diameter of the 1st female pipe, be formed with a tabula radially on the horizontal division board from the plate engagement groove, be used for inserting vertical division board; Correspondence position also is formed with a mediastinum that adapts from the plate engagement groove with tabula from the plate engagement groove on the described vertical division board.
Insulating space is connected with the refrigerant pipe of refrigerating system respectively with the back insulating space before described.Specifically, when heat exchanger was used as condenser, back insulating space was connected to the port of export of compressor; When heat exchanger was used as evaporimeter, preceding insulating space was connected to the port of export of condenser or the port of export of expansion valve.
Be formed with several isocon connectors on the tube wall of described the 1st female pipe evenly and at intervals, so that insert isocon; The bore of isocon connector is a rectangle, and is identical with the shape of the end face bore of isocon.
The shape of described the 2nd female pipe also is a cylindrical shape, its two ends are closed state, therefore the refrigerant that flows through isocon is flow back in the 1st female pipe again, the inside of the 2nd female pipe is provided with vertical division board along longitudinal direction from the upper end to 2/3 pipe range position, vertical then division board bottom is combined with horizontal division board.
Be formed with the corresponding isocon connector of several isocon connectors on the tube wall of described the 2nd female pipe with the 1st female pipe.
Form several microtubules in the described isocon, the isocon connector of first female pipe and second female pipe is inserted at the two ends of isocon respectively.
The two ends of described isocon are formed with the division board insertion groove, described vertical division board inserts in the division board insertion groove, the microtubule of division board insertion groove both sides is divided into the back coolant path by the sequence of flow of refrigerant and preceding refrigerant is logical, the number of the microtubule that comprises in back coolant path and the preceding coolant path is identical.
Described cooling fin is processed into undaform by the strip thin aluminium strip, and the wave crest point of cooling fin contacts with the tube wall of the isocon of both sides respectively.
Described vertical division board has certain thickness rectangular slab, and its width is basic identical with the internal diameter of the 1st female Guan Jidi 2 female pipes, vertical respectively the 1st female Guan Hedi 2 female pipes that insert of vertical division board.
The invention has the beneficial effects as follows: the refrigerant guiding device of heat exchanger provided by the invention can make refrigerant experience twice heat exchanging process in heat exchanger, thereby has improved the heat exchanger effectiveness of heat exchanger; And this apparatus structure is simple, has improved the packaging efficiency of heat exchanger.
Description of drawings
Fig. 1 is the structural representation of existing fine tube type heat exchanger;
Fig. 2 is the cross-sectional view of existing fine tube type heat exchanger;
Fig. 3 is a cross-sectional view that changes example of existing fine tube type heat exchanger;
Fig. 4 is the structural representation of fine tube type heat exchanger with refrigerant guiding device of heat exchanger of the present invention;
Fig. 5 has the fine tube type heat exchanger middle mediastinum of refrigerant guiding device of heat exchanger of the present invention from the decomposing schematic representation of plate and horizontal division board;
Fig. 6 is the integrated structure schematic diagram with isocon and division board in the fine tube type heat exchanger of refrigerant guiding device embodiment 1 of heat exchanger of the present invention;
Fig. 7 is the integrated structure schematic diagram with isocon and division board in the fine tube type heat exchanger of refrigerant guiding device embodiment 2 of heat exchanger of the present invention;
Fig. 8 is the refrigerant circulating path schematic diagram of fine tube type heat exchanger when the condenser with refrigerant guiding device embodiment 1 of heat exchanger of the present invention;
Fig. 9 is the refrigerant circulating path schematic diagram of fine tube type heat exchanger when the evaporimeter with refrigerant guiding device embodiment 1 of heat exchanger of the present invention;
Figure 10 is the refrigerant circulating path schematic diagram of fine tube type heat exchanger with refrigerant guiding device embodiment 2 of heat exchanger of the present invention.
Among the figure:
11: the 1 female pipe 11a: isocon connector
12: the 2 female pipes 13: isocon
13A: anteposition isocon 13B: position, back isocon
13a: microtubule 13b: division board insertion groove
14: cooling fin 15: vertical division board
15a: mediastinum is from plate engagement groove 15b: the isocon insertion groove
16: horizontal division board 16a: tabula is from the plate engagement groove
F1: preceding coolant path F2: back coolant path
S1: back insulating space S2: preceding insulating space
The specific embodiment
Be described in further detail below in conjunction with the refrigerant guiding device of the drawings and specific embodiments heat exchanger of the present invention:
As Fig. 4, Fig. 5, Fig. 6, Fig. 8 and shown in Figure 9, have the fine tube type heat exchanger of the refrigerant guiding device of heat exchanger of the present invention, comprising: the 1st female pipe the 11, the 2nd female pipe 12, several isocons 13, several cooling fins 14, vertical division board 15 and horizontal division board 16; The described the 2nd female pipe the 12 and the 1st female pipe 11 be arranged in parallel and with perpendicular to the ground, and the 1st femalely manages 11 and be connected with the compressor of refrigerating system by the refrigerant pipe; The end face bore of described isocon 13 is a rectangle, these isocons 13 are set in parallel in evenly and at intervals between the 1st female pipe the 11 and the 2nd female pipe 12 and are perpendicular with the female pipe of the 1st female pipe the 11 and the 2nd 12, the two ends of isocon 13 are connected with the 1st female pipe the 11 and the 2nd female pipe 12 respectively, its effect is the refrigerant in shunting the 1st female pipe 11, the refrigerant that flows out from isocon 13 converges to the 2nd female the pipe after 12, flow back into again in the 1st female pipe.
Described cooling fin 14 is undaform, is arranged between each isocon 13, and its wave crest point contacts with the tube wall of isocon 13 respectively, to increase the heat exchange area of heat exchanger and surrounding air.
Being provided with vertical division board 15 in the described the 1st female pipe the 11 and the 2nd female pipe 12, is benchmark with the surrounding air direction that flows, and vertical division board 15 is separated into back insulating space S1 and preceding insulating space S2 with the inner space of the 1st female pipe the 11 and the 2nd female pipe 12 respectively.
For large-scale heat exchanger, described cylindrical shape the 1st female pipe 11 inside also are provided with horizontal division board 16, horizontal division board 16 the cross-section fully the 1st female pipes 11, as shown in Figure 5, horizontal division board 16 be shaped as circular slab, its radius equates substantially with the internal diameter of the 1st female pipe 11, is formed with a tabula radially on the horizontal division board 16 from plate engagement groove 16a, is used for inserting vertical division board 15; Correspondence position also is formed with a mediastinum that adapts from plate engagement groove 16a with tabula from plate engagement groove 15a on the described vertical division board 15.
Described back insulating space S1 is connected with the refrigerant pipe (not shown) of refrigerating system respectively with preceding insulating space S2.Specifically, when heat exchanger was used as condenser, preceding insulating space S2 was connected to the port of export of compressor; When heat exchanger was used as evaporimeter, back insulating space S1 was connected to the port of export of condenser or the port of export of expansion valve.
Be formed with several isocon connectors 11a evenly and at intervals on the tube wall of the described the 1st female pipe 11, so that insert isocon 13; The bore of isocon connector 11a is a rectangle, and is identical with the shape of the end face bore of isocon 13.
The shape of the described the 2nd female pipe 12 also is a cylindrical shape, its two ends are closed state, the refrigerant that flows through isocon is flow back in the 1st female pipe 11 again, to being provided with vertical division board 15 the 2/3 pipe range position, vertical then division board 15 bottoms are combined with horizontal division board 16 along longitudinal direction from the upper end in the inside of the 2nd female pipe 12.
Be formed with several and the 1st female corresponding isocon connector of isocon connector 11a (not shown) of 11 of managing on the tube wall of the described the 2nd female pipe 12.
Form several microtubules 13a in the described isocon 13, the isocon connector of first female pipe 11 and second female pipe 12 is inserted at the two ends of isocon 13 respectively.
The two ends of described isocon 13 are formed with division board insertion groove 13b, described vertical division board 15 inserts among the division board insertion groove 13b, the number of the microtubule 13a that comprises among coolant path F1 and the back coolant path F2 before the microtubule 13a of division board insertion groove 13b both sides is divided into by the sequence of flow of refrigerant, preceding coolant path F1 and back coolant path F2 is identical.
Described cooling fin 14 is processed into undaform by the strip thin aluminium strip, and the wave crest point of cooling fin 14 contacts with the tube wall of the isocon 13 of both sides respectively.
Described vertical division board 15 has certain thickness rectangular slab, and its width internal diameter with the 1st female pipe the 11 and the 2nd female pipe 12 substantially is identical, vertical respectively the 1st female pipe the 11 and the 2nd female pipe 12 that inserts of vertical division board 15.
H1 in the accompanying drawing and h2 are respectively the refrigerant entrance and exit.
Below the above-mentioned course of work of fine tube type heat exchanger as condenser and evaporimeter time the with refrigerant guiding device of heat exchanger of the present invention is illustrated respectively:
Course of work when heat exchanger is used as condenser at first is described: as shown in Figure 8, the gaseous coolant of discharging from the refrigerant pipe (not shown) of compressor, flow into the preceding insulating space S2 of the 1st female pipe 11, by each isocon 13 microtubule 13a among the preceding coolant path F1, after in the 2nd female pipe 12, converging, flow into the back insulating space S1 of the 1st female pipe 11 again by the microtubule 13a in each isocon 13 among the coolant path F2 of back, arrange expansion valve to refrigerating system by the refrigerant pipe (not shown) that links to each other with back insulating space S1.
In this process, the refrigerant of each isocon 13 microtubule 13a before flowing through among the coolant path F1 carries out condensing first after the heat exchange with surrounding air by isocon 13 tube walls and cooling fin 14, and air is emitted heat towards periphery.The refrigerant that flows through the microtubule 13a in each isocon 13 among the coolant path F2 of back further carries out heat exchange by isocon 13 tube walls and cooling fin 14 with surrounding air, condenses once more, and air is emitted heat towards periphery once more.By twice heat exchange, improved the heating efficiency of heat exchanger.
The course of work when the following describes heat exchanger as evaporimeter, as shown in Figure 9: after liquid refrigerants (being mixed with certain gaseous coolant) is discharged from compressor outlet, by being connected the refrigerant pipe (not shown) on the expansion valve, flow into the back insulating space S1 (is benchmark with the circulation of air direction) of the 1st female pipe 11, be diverted to the microtubule 13a in the isocon 13 among the back coolant path F2 that links to each other with back insulating space S1 then, after converging inflow the 2nd female pipe, flow into the preceding insulating space S2 of the 1st female pipe 11 by the microtubule 13a in each isocon 13 among the preceding coolant path F1, give compressor by the refrigerant pipe (not shown) loopback that is connected with preceding insulating space S2 at last.
In this process, flow through the refrigerant of the microtubule 13a in the isocon 13 among the back coolant path F2 that links to each other with back insulating space S1, tube wall by each isocon 13 and cooling fin 14 and surrounding air are carried out heat exchange first, and refrigerant evaporates first; Then, the refrigerant of each isocon 13 before flowing through among the coolant path F1, tube wall and cooling fin 14 by each isocon 13 carry out heat exchange once more with surrounding air, evaporate once more.By twice heat exchange, improved the freezing capacity of heat exchanger.
The specific embodiment 2
As shown in Figure 7, division board insertion groove 13b is not established at the two ends of described isocon 13, and the inboard of vertical division board 15 is formed with isocon insertion groove 15b, so that insert isocon 13.
As shown in figure 10, insert among the described isocon insertion groove 15b after the vertical division board 15, each isocon 13 is divided into anteposition isocon 13A and position, back isocon 13B two parts.
The advantage of this specific embodiment is: owing to need not to be processed to form division board insertion groove 13b on each isocon 13, reduced isocon 13 manufacturing processes, reduced cost, simultaneously, improved packaging efficiency.
H1 in the accompanying drawing and h2 are respectively the refrigerant entrance and exit.
Claims (7)
1. the refrigerant guiding device of a heat exchanger comprises: the 1st female pipe, the 2nd female pipe, several isocons; The described the 2nd female Guan Yudi 1 female pipe be arranged in parallel; Described isocon is set in parallel in evenly and at intervals between the 1st female Guan Hedi 2 female pipes and is perpendicular with the 1st female Guan Hedi 2 female pipes, and the two ends of isocon are connected with the 1st female Guan Hedi 2 female pipes respectively; It is characterized in that: be respectively arranged with vertical division board (15) in the described the 1st female pipe (11) and the 2nd female pipe (12), vertical division board (15) is separated into preceding insulating space (S1) and back insulating space (S2) with the inner space of the 1st female pipe (11) and the 2nd female pipe (12) respectively, and each isocon (13) is divided into back coolant path (F1) and preceding coolant path (F2).
2. the refrigerant guiding device of heat exchanger according to claim 1, it is characterized in that: the described the 1st female pipe (11) and the 2nd female pipe (12) inside also are provided with horizontal division board (16), horizontal division board (16) the cross-section fully the 1st female pipe (11) and the 2nd female pipe (12), isocon (13) is divided into several layers, thereby refrigerant is circulated along about isocon (13).
3. the refrigerant guiding device of heat exchanger according to claim 1 and 2, it is characterized in that: the two ends of the described the 2nd female pipe (12) are closed state, the refrigerant that flows through isocon is flow back in the 1st female pipe (11) again, the inside of the 2nd female pipe (12) is provided with vertical division board (15) along longitudinal direction from the upper end to the 2/3 pipe range position, and vertical then division board (15) bottom is combined with horizontal division board (16).
4. the refrigerant guiding device of heat exchanger according to claim 1 and 2, it is characterized in that: described horizontal division board (16) be shaped as circular slab, its radius equates substantially with the internal diameter of the 1st female pipe (11) and the 2nd female pipe (12), be formed with a tabula radially on the horizontal division board (16) from plate engagement groove (16a), be used for inserting vertical division board (15); Described vertical division board (15) is gone up correspondence position and also is formed with a mediastinum that adapts from plate engagement groove (16a) with tabula from plate engagement groove (15a).
5. the refrigerant guiding device of heat exchanger according to claim 1 and 2, it is characterized in that: the two ends of described each isocon (13) are formed with division board insertion groove (13b) respectively, and vertical division board (15) inserts the division board insertion groove (13b) at each isocon (13) two ends respectively.
6. the refrigerant guiding device of heat exchanger according to claim 1 and 2, it is characterized in that: described vertical division board (15) is gone up and is formed with several isocon insertion grooves (15b) towards the terminal side of each isocon (13), the end of each isocon (13) inserts corresponding isocon insertion groove (15b) respectively afterwards, and each isocon (13) is divided into back coolant path (F1) and preceding coolant path (F2).
7. the refrigerant guiding device of heat exchanger according to claim 1 and 2 is characterized in that: the both sides of described vertical division board (15) form anteposition isocon (13A) and position, back isocon (13B) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031096972A CN1536317A (en) | 2003-04-11 | 2003-04-11 | Refrigerant flow-guiding device for heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031096972A CN1536317A (en) | 2003-04-11 | 2003-04-11 | Refrigerant flow-guiding device for heat exchanger |
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| Publication Number | Publication Date |
|---|---|
| CN1536317A true CN1536317A (en) | 2004-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031096972A Pending CN1536317A (en) | 2003-04-11 | 2003-04-11 | Refrigerant flow-guiding device for heat exchanger |
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| CN (1) | CN1536317A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827248A (en) * | 2019-03-26 | 2019-05-31 | 山东烯泰天工节能科技有限公司 | Internet of Things screen display minimizes outdoor machine of air-conditioner |
-
2003
- 2003-04-11 CN CNA031096972A patent/CN1536317A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827248A (en) * | 2019-03-26 | 2019-05-31 | 山东烯泰天工节能科技有限公司 | Internet of Things screen display minimizes outdoor machine of air-conditioner |
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