CN211335510U - Heat pump air conditioning system suitable for new energy automobile - Google Patents
Heat pump air conditioning system suitable for new energy automobile Download PDFInfo
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- CN211335510U CN211335510U CN201921933939.8U CN201921933939U CN211335510U CN 211335510 U CN211335510 U CN 211335510U CN 201921933939 U CN201921933939 U CN 201921933939U CN 211335510 U CN211335510 U CN 211335510U
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Abstract
The utility model provides a heat pump air conditioning system suitable for new energy automobile, including compressor part (1), air conditioner box (2), interior condenser part (3), exterior heat exchanger (4), water-cooled heat exchanger (5), interior evaporimeter (6), vapour and liquid separator (7), air-blower (8), first full-through electronic expansion valve (9), second full-through electronic expansion valve (10), solenoid valve (11), take thermostatic expansion valve (12) of cut-off function, temperature air door (13); the temperature air door is arranged between the internal condenser part and the internal evaporator; the condenser part in the vehicle is connected with the compressor part and the first all-pass electronic expansion valve; the first all-pass electronic expansion valve is connected with the heat exchanger outside the vehicle; the heat exchanger outside the vehicle is connected with a second all-pass electronic expansion valve; through the external heat exchanger of the variable flow process, the external heat exchanger is used as a condenser and an evaporator and simultaneously enters and exits, the pipeline arrangement is simple, the system valves are fewer, and the heat exchange effect of the system is not influenced.
Description
Technical Field
The utility model relates to a new energy automobile heat management field specifically relates to a heat pump air conditioning system suitable for new energy automobile, especially a new energy automobile heat pump air conditioning system who possesses outer heat exchanger of variable flow range and vehicle thereof.
Background
Along with the development of automobile technology, the occupancy of electric automobile in the vehicle is higher and higher, electric automobile heat pump air conditioning technology is also more and more research and application, heat pump air conditioning system has been configured to existing many electric automobile home and abroad, the outer heat exchanger not only is as the condenser still as the evaporimeter in heat pump air conditioning system, be the important subassembly in the heat pump air conditioning system, its structural design influences the heat transfer effect and the system complexity of system, the not enough and outer heat exchanger frosting problem of heat pump air conditioning system under the low temperature condition also needs to solve urgently. At present, the inlet and the outlet of the heat exchanger outside the vehicle adopted by most of the heat pump air-conditioning systems of the electric automobiles are inconsistent when the heat exchanger is used as a condenser and an evaporator, which increases the complexity of the pipeline connection of the system. Therefore, it is necessary to develop a heat pump air conditioning system for a new energy automobile, which has a small number of valves, can effectively improve the heating effect of the system in a low temperature environment and prevent the external heat exchanger from frosting, and which has a simple system structure, greatly reduces the cost, improves the efficiency and stability of the system operation, and is beneficial to the popularization of the heat pump system in new energy automobiles.
Patent document CN109695917A discloses an air conditioning system including: an outdoor unit including an outdoor heat exchanger (5); the indoor unit comprises an indoor heat exchanger 7 communicated with the outdoor heat exchanger 5; and the air suspension type centrifugal compressor 1 is communicated with the outdoor heat exchanger 5 and the indoor heat exchanger 7. The patent is not well applicable to the heat pump air conditioning system of the new energy automobile.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model aims at providing a heat pump air conditioning system suitable for new energy automobile.
According to the utility model provides a pair of heat pump air conditioning system suitable for new energy automobile, include: the system comprises a compressor part 1, an air conditioner box body 2, an internal condenser part 3, an external heat exchanger 4, a water-cooled heat exchanger 5, an internal evaporator 6, a gas-liquid separator 7, a blower 8, a first full-through electronic expansion valve 9, a second full-through electronic expansion valve 10, an electromagnetic valve 11, a thermostatic expansion valve 12 with a cut-off function and a temperature air door 13; the temperature air door 13 is arranged between the internal condenser part (3) and the internal evaporator (6) to play a role in switching on and off air flow; the internal condenser part 3 is connected with the compressor part 1 and the first all-pass electronic expansion valve 9; the first all-pass electronic expansion valve 9 is connected with the exterior heat exchanger 4; the exterior heat exchanger 4 is connected with a second all-pass electronic expansion valve 10; the second all-pass electronic expansion valve 10 is connected with the water-cooling heat exchanger 5; the exterior heat exchanger 4 is connected with a thermostatic expansion valve 12; the thermostatic expansion valve 12 is connected with the evaporator 6 in the vehicle; one end of the gas-liquid separator 7 is connected with the thermostatic expansion valve 12 and the water-cooled heat exchanger 5; the other end of the gas-liquid separator 7 is connected with the compressor part 1; the air blower 8, the temperature air door 13, the internal condenser part 3 and the internal evaporator 6 are arranged on the air conditioner box body 2.
Preferably, the method further comprises the following steps: an electromagnetic valve 11; the electromagnetic valve 11 is respectively connected with the first full-through electronic expansion valve 9, the internal condenser part 3 and the thermostatic expansion valve 12.
Preferably, the thermostatic expansion valve 12 has a solenoid valve integrated structure.
Preferably, the exterior heat exchanger 4 includes: the device comprises a first collecting pipe 14, an inlet assembly 15, an outlet assembly 16, a second collecting pipe 21 and a flat pipe component 22; the inlet assembly 15 is connected with the first collecting pipe 14; the outlet assembly 16 is connected to the first header 14; the flat pipe components 22 are respectively connected with the first collecting pipe 14 and the second collecting pipe 21; the exterior heat exchanger 4 further includes: a first bellows regulating valve 17, a second bellows regulating valve 19, a first side plate 18, and a second side plate 20; a first bellows adjusting valve 17 and a first edge plate 18 are arranged at one end of the first collecting pipe 14; the second bellows adjusting valve 19 and the second side plate 20 are arranged at the other end of the first collecting pipe 14; the first bellows-type valve 17 can be closed or separated from the first side plate 18; the second bellows adjusting valve 19 can be closed or separated from the second side plate 20; the inlet assembly is adjacent to the second bellows regulating valve 19; the outlet assembly is adjacent to the first bellows-type regulating valve 17.
Preferably, when the first bellows adjusting valve 17 and the first side plate 18 are closed and the second bellows adjusting valve 19 and the second side plate 20 are closed, the first header 14 is divided into the following three regions: -a first header first region; -a first header second region; -a first header third region; the first collecting pipe first region, the first collecting pipe second region and the first collecting pipe third region are respectively communicated with the flat pipe component 22.
Preferably, the flat tube part 22 includes: an upper side plate, a lower side plate and flat pipes; the upper side plate and the lower side plate are parallel to the flat tubes.
Preferably, one or more fins 23 are arranged on the upper side plate and the flat tubes, and a gap exists between two adjacent fins 23.
Preferably, the first bellows adjusting valve 17 and the second bellows adjusting valve 19 constitute a bellows adjusting valve; the bellows regulating valve includes: bellows, valve stem seal ring; the corrugated pipe is connected with the valve rod; the valve rod sealing ring is arranged on the ejector rod of the valve rod.
Preferably, the exterior heat exchanger 4 takes any one of the following states: -a condenser state; -evaporator state.
Preferably, the flat tube component 22 further includes: one or more orifices; the pore channels are arranged along the length direction of the flat pipe component (22); the plurality of tunnels are arranged in parallel.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a variable flow journey external heat exchanger, it is simultaneously advancing when condenser and evaporimeter with going out, and the pipe arrangement is simple, and the system valve is less, and does not influence system's heat transfer effect.
2. The utility model discloses well water-cooling heat exchanger both can regard as the battery cooler, can regard as waste heat recovery heat exchanger again, has reduced water-cooling heat exchanger's quantity, has simplified the system architecture.
3. The utility model discloses when the lower humidity of well ambient temperature is great, the outer heat exchanger of bypass car, as the evaporimeter through evaporimeter and water cooled heat exchanger in the car, do not worry the outer heat exchanger frosting problem, heat pump system can efficient work in succession.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of an embodiment of the present invention.
Fig. 3 is a schematic view of an embodiment of a heating mode in an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an embodiment of a dehumidification-heating mode according to an embodiment of the present invention.
Fig. 5 is the structure schematic diagram of the outer heat exchanger in the embodiment of the utility model.
Fig. 6 is the utility model discloses an embodiment in the embodiment outer heat exchanger as condenser structure sketch map.
Fig. 7 is a schematic structural view of the external heat exchanger as an evaporator in the embodiment of the present invention.
In the figure:
compressor element 1 solenoid valve 11
First collecting pipe 14 of external heat exchanger 4
In-vehicle evaporator 6 outlet assembly 16
Second collecting main 21 of gas-liquid separator 7
First all-pass electronic expansion valve 9 fin 23
Second all-pass electronic expansion valve 10
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
According to the utility model provides a pair of heat pump air conditioning system suitable for new energy automobile, include: the system comprises a compressor part 1, an air conditioner box body 2, an internal condenser part 3, an external heat exchanger 4, a water-cooled heat exchanger 5, an internal evaporator 6, a gas-liquid separator 7, a blower 8, a first full-through electronic expansion valve 9, a second full-through electronic expansion valve 10, an electromagnetic valve 11, a thermostatic expansion valve 12 with a cut-off function and a temperature air door 13; the temperature air door 13 is arranged between the internal condenser part (3) and the internal evaporator (6) to play a role in switching on and off air flow; the internal condenser part 3 is connected with the compressor part 1 and the first all-pass electronic expansion valve 9; the first all-pass electronic expansion valve 9 is connected with the exterior heat exchanger 4; the exterior heat exchanger 4 is connected with a second all-pass electronic expansion valve 10; the second all-pass electronic expansion valve 10 is connected with the water-cooling heat exchanger 5; the exterior heat exchanger 4 is connected with a thermostatic expansion valve 12; the thermostatic expansion valve 12 is connected with the evaporator 6 in the vehicle; one end of the gas-liquid separator 7 is connected with the thermostatic expansion valve 12 and the water-cooled heat exchanger 5; the other end of the gas-liquid separator 7 is connected with the compressor part 1; the air blower 8, the temperature air door 13, the internal condenser part 3 and the internal evaporator 6 are arranged on the air conditioner box body 2.
Preferably, the method further comprises the following steps: an electromagnetic valve 11; the electromagnetic valve 11 is respectively connected with the first full-through electronic expansion valve 9, the internal condenser part 3 and the thermostatic expansion valve 12.
Preferably, the thermostatic expansion valve 12 has a solenoid valve integrated structure.
Preferably, the exterior heat exchanger 4 includes: the device comprises a first collecting pipe 14, an inlet assembly 15, an outlet assembly 16, a second collecting pipe 21 and a flat pipe component 22; the inlet assembly 15 is connected with the first collecting pipe 14; the outlet assembly 16 is connected to the first header 14; the flat pipe components 22 are respectively connected with the first collecting pipe 14 and the second collecting pipe 21; the exterior heat exchanger 4 further includes: a first bellows regulating valve 17, a second bellows regulating valve 19, a first side plate 18, and a second side plate 20; a first bellows adjusting valve 17 and a first edge plate 18 are arranged at one end of the first collecting pipe 14; the second bellows adjusting valve 19 and the second side plate 20 are arranged at the other end of the first collecting pipe 14; the first bellows-type valve 17 can be closed or separated from the first side plate 18; the second bellows adjusting valve 19 can be closed or separated from the second side plate 20; the inlet assembly is adjacent to the second bellows regulating valve 19; the outlet assembly is adjacent to the first bellows-type regulating valve 17.
Preferably, when the first bellows adjusting valve 17 and the first side plate 18 are closed and the second bellows adjusting valve 19 and the second side plate 20 are closed, the first header 14 is divided into the following three regions: -a first header first region; -a first header second region; -a first header third region; the first collecting pipe first region, the first collecting pipe second region and the first collecting pipe third region are respectively communicated with the flat pipe component 22.
Preferably, the flat tube part 22 includes: an upper side plate, a lower side plate and flat pipes; the upper side plate and the lower side plate are parallel to the flat tubes.
Preferably, one or more fins 23 are arranged on the upper side plate and the flat tubes, and a gap exists between two adjacent fins 23.
Preferably, the first bellows adjusting valve 17 and the second bellows adjusting valve 19 constitute a bellows adjusting valve; the bellows regulating valve includes: bellows, valve stem seal ring; the corrugated pipe is connected with the valve rod; the valve rod sealing ring is arranged on the ejector rod of the valve rod.
Preferably, the exterior heat exchanger 4 takes any one of the following states: -a condenser state; -evaporator state.
Preferably, the flat tube component 22 further includes: one or more orifices; the pore channels are arranged along the length direction of the flat pipe (4); the plurality of tunnels are arranged in parallel.
Specifically, in one embodiment, as shown in fig. 1 and 2, in a heat pump air conditioning system, a temperature damper 13 closes an air flow passage of an internal condenser, high-temperature and high-pressure refrigerant gas from a compressor passes through the internal condenser (at this time, the internal condenser hardly exchanges heat) and then passes through a first all-pass electronic expansion valve, the expansion valve is fully opened and has no throttling function, the high-temperature and high-pressure refrigerant gas enters an external heat exchanger (at this time, the external heat exchanger serves as a condenser, the flow distribution is that a first flow flat tube is larger than a second flow flat tube is smaller), after condensation and heat release, one path of refrigerant passes through a second all-pass electronic expansion valve, the second all-pass electronic expansion valve throttles and reduces the pressure of incoming refrigerant and then enters a water-cooling heat exchanger, and the water-cooling heat exchanger serves as a battery cooler (a water; the other path of the refrigerant is throttled by a thermostatic expansion valve with a cut-off function and then enters an evaporator in the vehicle to cool the passenger compartment; refrigerant gas from the water-cooled heat exchanger and the evaporator in the vehicle returns to the compressor after passing through the gas-liquid separator.
As shown in fig. 3, the air flow passage of the internal condenser is opened by the temperature damper 13, the high-temperature and high-pressure refrigerant gas from the compressor passes through the internal condenser (at this time, the heat exchange of the internal condenser is used for heating the passenger compartment), then passes through the first all-way electronic expansion valve, the refrigerant from the internal condenser is throttled and depressurized by the first all-way electronic expansion valve, then enters the external heat exchanger (at this time, the external heat exchanger serves as an evaporator, the flow distribution is that the number of first flow flat tubes is small and the number of second flow flat tubes is large), the refrigerant from the external heat exchanger enters the water-cooling heat exchanger after passing through the second all-way electronic expansion valve, at this time, the thermal expansion valve with a stop function is closed, the second all-way electronic expansion valve is not throttled, the water-cooling heat exchanger serves as a waste heat recovery heat exchanger to recover the heat of electrical appliances such as a battery.
As shown in fig. 4, the air flow passage of the internal condenser is opened by the temperature damper 13, the high-temperature and high-pressure refrigerant gas from the compressor passes through the internal condenser (at this time, the internal condenser exchanges heat to heat the passenger compartment), the first all-through electronic expansion valve is closed, the electromagnetic valve 11 and the thermostatic expansion valve with the cut-off function are opened, and after passing through the electromagnetic valve 11, the refrigerant from the internal condenser is throttled by the thermostatic expansion valve with the cut-off function and enters the internal evaporator to dehumidify and cool the incoming air; the other path enters a water-cooled heat exchanger after being throttled by a second all-pass electronic expansion valve, the water-cooled heat exchanger can absorb the heat of batteries and the heat of electric appliances such as a motor and the like, and the water-cooled heat exchanger is converged with a refrigerant coming out of an evaporator in the vehicle and then returns to the compressor through a gas-liquid separator.
As shown in fig. 5 and 6, the high-temperature and high-pressure refrigerant gas enters the first header from the inlet, and the first header includes two bellows regulating valves and two side plates. High-pressure refrigerant gas backs down the valve rod of first bellows governing valve (refrigerant pressure is greater than the bellows pretightning force) for first sideboard passageway is opened, and high-pressure refrigerant gas is through reacing first sideboard, and high pressure makes the valve rod of second bellows governing valve closely closed with the second sideboard, forms first flow between second sideboard and the import like this, and refrigerant gas reachs the export through flat pipe after flat pipe reachs the second pressure manifold, the second flow promptly.
As shown in fig. 7, a low-temperature low-pressure two-phase refrigerant enters the first collecting pipe through the inlet, the valve rod of the first bellows regulating valve is closed tightly with the first side plate (the refrigerant pressure is smaller than the bellows pretightening force) at this time, the refrigerant cannot pass through, and the second side plate and the inlet form a first flow path; the refrigerant reaches the second pressure manifold through the flat pipe, and the valve rod and the second sideboard of second bellows governing valve separate this moment, and second sideboard passageway is opened, and the refrigerant reaches the export through remaining flat pipe.
The utility model discloses a variable flow journey external heat exchanger, it is simultaneously advancing when condenser and evaporimeter with going out, and the pipe arrangement is simple, and the system valve is less, and does not influence system's heat transfer effect. The utility model discloses well water-cooling heat exchanger both can regard as the battery cooler, can regard as waste heat recovery heat exchanger again, has reduced water-cooling heat exchanger's quantity, has simplified the system architecture. The utility model discloses when the lower humidity of well ambient temperature is great, the outer heat exchanger of bypass car, as the evaporimeter through evaporimeter and water cooled heat exchanger in the car, do not worry the outer heat exchanger frosting problem, heat pump system can efficient work in succession.
One skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, units provided by the present invention as pure computer readable program code, the system and its various devices, modules, units provided by the present invention can be implemented with the same functionality in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like, all by logically programming the steps of the method. Therefore, the system and the devices, modules and units thereof provided by the present invention can be regarded as a hardware component, and the devices, modules and units included therein for implementing various functions can also be regarded as structures in the hardware component; means, modules, units for performing the various functions may also be regarded as structures within both software modules and hardware components for performing the method.
In the description of the present application, it is to be understood that the terms "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 only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. The utility model provides a heat pump air conditioning system suitable for new energy automobile which characterized in that includes: the air conditioner comprises a compressor part (1), an air conditioner box body (2), an internal condenser part (3), an external heat exchanger (4), a water-cooled heat exchanger (5), an internal evaporator (6), a gas-liquid separator (7), a blower (8), a first full-through electronic expansion valve (9), a second full-through electronic expansion valve (10), an electromagnetic valve (11), a thermostatic expansion valve (12) and a temperature air door (13);
the temperature air door (13) is arranged between the internal condenser part (3) and the internal evaporator (6);
the internal condenser part (3) is connected with the compressor part (1) and the first full-through electronic expansion valve (9);
the first all-pass electronic expansion valve (9) is connected with the heat exchanger (4) outside the vehicle;
the heat exchanger (4) outside the vehicle is connected with a second all-pass electronic expansion valve (10);
the second all-pass electronic expansion valve (10) is connected with the water-cooling heat exchanger (5);
the heat exchanger (4) outside the vehicle is connected with a thermostatic expansion valve (12);
the thermostatic expansion valve (12) is connected with an evaporator (6) in the vehicle;
one end of the gas-liquid separator (7) is connected with the thermostatic expansion valve (12) and the water-cooled heat exchanger (5);
the other end of the gas-liquid separator (7) is connected with the compressor part (1);
the air blower (8), the temperature air door (13), the internal condenser part (3) and the internal evaporator (6) are arranged in the air-conditioning box body (2).
2. The heat pump air conditioning system suitable for the new energy automobile according to claim 1, further comprising: an electromagnetic valve (11);
the electromagnetic valve (11) is respectively connected with the first full-through electronic expansion valve (9), the internal condenser part (3) and the thermostatic expansion valve (12).
3. The heat pump air-conditioning system suitable for the new energy automobile according to claim 1, wherein the thermostatic expansion valve (12) has an electromagnetic valve integrated structure.
4. The heat pump air conditioning system suitable for a new energy automobile according to claim 1, wherein the exterior heat exchanger (4) includes: the device comprises a first collecting pipe (14), an inlet assembly (15), an outlet assembly (16), a second collecting pipe (21) and a flat pipe component (22);
the inlet assembly (15) is connected with the first collecting pipe (14);
the outlet assembly (16) is connected with the first collecting pipe (14);
the flat pipe component (22) is respectively connected with the first collecting pipe (14) and the second collecting pipe (21);
the exterior heat exchanger (4) further includes: a first bellows regulating valve (17), a second bellows regulating valve (19), a first side plate (18) and a second side plate (20);
the first bellows adjusting valve (17) and the first side plate (18) are arranged at one end of the first collecting pipe (14);
the second corrugated pipe adjusting valve (19) and the second side plate (20) are arranged at the other end of the first collecting pipe (14);
the first bellows adjusting valve (17) can be closed or separated from the first side plate (18);
the second bellows adjusting valve (19) can be closed or separated from the second side plate (20);
the inlet assembly is adjacent to a second bellows regulating valve (19);
the outlet assembly is adjacent a first bellows-type regulator valve (17).
5. The heat pump air-conditioning system suitable for the new energy automobile according to claim 4, wherein when the first bellows adjusting valve (17) and the first side plate (18) are closed and the second bellows adjusting valve (19) and the second side plate (20) are closed, the first header (14) is divided into the following three regions:
-a first header first region;
-a first header second region;
-a first header third region;
the first collecting pipe first area, the first collecting pipe second area and the first collecting pipe third area are respectively communicated with the flat pipe component (22).
6. The heat pump air-conditioning system suitable for the new energy automobile is characterized in that the flat pipe component (22) comprises: an upper side plate, a lower side plate and flat pipes;
the upper side plate and the lower side plate are parallel to the flat tubes.
7. The heat pump air-conditioning system suitable for the new energy automobile is characterized in that one or more fins (23) are arranged on the upper side plate and the flat tubes, and a gap exists between every two adjacent fins (23).
8. The heat pump air-conditioning system suitable for the new energy automobile is characterized in that the first bellows regulating valve (17) and the second bellows regulating valve (19) form a bellows regulating valve;
the bellows regulating valve includes: bellows, valve stem seal ring;
the corrugated pipe is connected with the valve rod;
the valve rod sealing ring is arranged on the ejector rod of the valve rod.
9. The heat pump air-conditioning system suitable for the new energy automobile according to claim 4, characterized in that the exterior heat exchanger (4) adopts any one of the following states:
-a condenser state;
-evaporator state.
10. The heat pump air-conditioning system suitable for the new energy automobile is characterized in that the flat pipe component (22) further comprises: one or more orifices;
the pore channels are arranged along the length direction of the flat pipe component (22);
the plurality of tunnels are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921933939.8U CN211335510U (en) | 2019-11-11 | 2019-11-11 | Heat pump air conditioning system suitable for new energy automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921933939.8U CN211335510U (en) | 2019-11-11 | 2019-11-11 | Heat pump air conditioning system suitable for new energy automobile |
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| Publication Number | Publication Date |
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| CN211335510U true CN211335510U (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921933939.8U Active CN211335510U (en) | 2019-11-11 | 2019-11-11 | Heat pump air conditioning system suitable for new energy automobile |
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| Country | Link |
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| CN (1) | CN211335510U (en) |
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- 2019-11-11 CN CN201921933939.8U patent/CN211335510U/en active Active
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