CN215927718U - Compressor cooling system and hydrogen station - Google Patents
Compressor cooling system and hydrogen station Download PDFInfo
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- CN215927718U CN215927718U CN202122391970.7U CN202122391970U CN215927718U CN 215927718 U CN215927718 U CN 215927718U CN 202122391970 U CN202122391970 U CN 202122391970U CN 215927718 U CN215927718 U CN 215927718U
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Abstract
The application provides a compressor cooling system and hydrogenation station belongs to compressor technical field, and compressor cooling system includes: the pump body assemblies are arranged in series and used for compressing gas; the cooling system is respectively connected with the pump body assemblies and is used for outputting cooling water to cool the pump body assemblies; and a plurality of regulating devices, each regulating device being arranged between the cooling system and one of the pump body assemblies, the regulating devices being adapted to regulate the flow of cooling water delivered from the cooling system to the pump body assemblies. Through the technical scheme of this application, can adjust the switch and the flow of the cooling water of every pump body subassembly, realize the accurate distribution of the different cooling capacities of every pump body subassembly, reach the purpose of accurate accuse temperature and efficient thermal management.
Description
Technical Field
The application belongs to the technical field of compressors, and particularly relates to a compressor cooling system and a hydrogen filling station.
Background
The compressor can generate a large amount of compression heat in the gas pressurization process, so that temperature rise is caused, and a matched cooling system is needed to cool the cylinder and discharged gas. The existing cooling system is single in control, cannot meet different cooling capacity requirements of each pump body, and is prone to problems of heat waste, inaccurate temperature control and the like.
SUMMERY OF THE UTILITY MODEL
Embodiments according to the present application aim to ameliorate at least one of the technical problems of the prior art or the related art.
In view of the above, an object according to an embodiment of the present application is to provide a compressor cooling system.
It is another object of embodiments according to the present application to provide a hydrogen refueling station.
In order to achieve the above object, according to a first aspect of the present application, there is provided a compressor cooling system including: the pump body assemblies are arranged in series and used for compressing gas; the cooling system is respectively connected with the pump body assemblies and is used for outputting cooling water to cool the pump body assemblies; and a plurality of regulating devices, each regulating device being arranged between the cooling system and one of the pump body assemblies, the regulating devices being adapted to regulate the flow of cooling water delivered from the cooling system to the pump body assemblies.
According to the application, a cooling system of a compressor comprises a plurality of pump body assemblies, a cooling system and a plurality of adjusting devices. The cooling system is used for outputting cooling water to cool the pump body assembly. Each adjusting device is arranged between the cooling system and one pump body assembly, and the adjusting devices can adjust the flow of cooling water conveyed to the pump body assemblies from the cooling system, so that accurate distribution of different cooling amounts of each pump body assembly is realized, and the purposes of accurate temperature control and efficient heat management are achieved. And effectively avoided compressor cooling system overtemperature to appear, promoted compressor cooling system's life-span, increased the security of equipment.
In addition, the technical scheme provided by the application can also have the following additional technical characteristics:
among the above-mentioned technical scheme, pump body subassembly includes: a pump body for compressing gas; and the gas cooler is communicated with the pump body and used for cooling gas.
In this technical scheme, the pump body subassembly includes the pump body and gas cooler, and the pump body is used for compressed gas. When the pump body compresses gas, a large amount of compression heat is generated, so that temperature rise is caused, and the gas cooler cools the gas compressed by the pump body.
In the above technical solution, the adjusting device includes: the first valve is used for communicating or isolating the cooling system and the pump body assembly; and the flow regulating valve is used for regulating the flow of the cooling water.
In this solution, the regulating device comprises a first valve and a flow regulating valve. The first valve can communicate or isolate the cooling system and the pump body assembly as required, and the flow regulating valve is used for regulating the flow of cooling water. When a plurality of pump body subassemblies work together, because the operating mode and the temperature of every pump body subassembly are all different, required cooling capacity is also different, through setting up first valve and flow control valve, can adjust the switch and the flow of the cooling water of every pump body subassembly, realizes the accurate distribution of the different cooling capacities of every pump body subassembly.
In the above technical solution, the adjusting device includes: the valve body is used for communicating or isolating the cooling system and the pump body assembly; the valve body is also used for adjusting the flow of cooling water.
In this technical scheme, adjusting device includes the valve body, and the valve body can communicate or isolated cooling system and pump body subassembly as required, can also adjust the flow of cooling water. When a plurality of pump body subassemblies work together, because the operating mode and the temperature of every pump body subassembly are all different, required cooling capacity is also different, through setting up the valve body, can adjust the switch and the flow of the cooling water of every pump body subassembly, realizes the accurate distribution of the different cooling capacities of every pump body subassembly.
In the above technical solution, the compressor cooling system further includes: and the controller is respectively electrically connected with the first valve and the flow regulating valve and is used for controlling the opening and closing of the first valve and controlling the flow regulating valve to regulate the flow of the cooling water.
In this technical scheme, compressor cooling system still includes the controller, and the switch of first valve and the flow control valve regulation cooling water's of control flow can be respectively adjusted according to the needs of every pump body subassembly to the controller to accurate different cooling capacities of distributing to every pump body subassembly reach the purpose of accurate accuse temperature and efficient heat management.
Among the above-mentioned technical scheme, pump body subassembly still includes: the first temperature sensor is arranged at the gas input end of the pump body and used for detecting the gas temperature; and the second temperature sensor is arranged at the gas output end of the pump body and is used for detecting the gas temperature.
In this technical scheme, the pump body subassembly still includes first temperature sensor and second temperature sensor, and gas input end and the gas output end of the pump body are located respectively to first temperature sensor and second temperature sensor, can detect out the gas temperature of gas input end and the gas output end of the pump body.
Among the above-mentioned technical scheme, the controller still is connected with first temperature sensor and second temperature sensor electricity, and the controller is according to the gas temperature that first temperature sensor and second temperature sensor detected, and the switch of control first valve and the flow control valve regulation cooling water's of control flow.
In this technical scheme, the controller can be based on the analysis to the gas temperature that first temperature sensor and second temperature sensor detected, control the switch of first valve and the aperture of flow control valve, realize the different cooling capacity supply of different pump body subassemblies.
In the above technical solution, the compressor cooling system further includes: the output pipeline is used for outputting gas; and the gas pipeline is communicated with the pump body, the gas cooler and the output pipeline.
In the technical scheme, the compressor cooling system further comprises an output pipeline and a gas pipeline, the gas pipeline is communicated with the pump body, the gas cooler and the output pipeline, gas compressed by the pump body can be input into the gas cooler to be cooled and then discharged from the output pipeline, and gas compressed by the pump body can also be input into the gas cooler to be cooled and then input into an adjacent pump body to be compressed.
In the above technical solution, the compressor cooling system further includes: a plurality of second valves disposed on the gas line between the gas cooler and the output line; and a third valve is arranged on the gas pipeline between two adjacent pump body assemblies.
In this aspect, the compressor cooling system further includes a plurality of second valves and a plurality of third valves. The second valve is used for controlling whether the gas cooled by the gas cooler is delivered to the output pipeline. The third valve is used for controlling whether the gas cooled by the gas cooler is delivered to an adjacent pump body for compression.
In the above technical solution, the controller is further electrically connected to the second valve and the third valve, and the controller is further configured to control opening and closing of the second valve and the third valve.
In this embodiment, the controller is electrically connected to the plurality of second valves and the plurality of third valves, and the controller may control the opening and closing of the second valves and the third valves as necessary, so that the gas cooled by the gas cooler is directly discharged or is discharged after being compressed for a plurality of times.
According to a second aspect of the present application, there is provided a hydrogen station comprising: a compressor cooling system according to any one of the preceding claims.
According to the present application, a hydrogen filling station includes a compressor cooling system according to any one of the above first aspects of the present application, so that the hydrogen filling station has all the advantages of the compressor cooling system according to any one of the above first aspects of the present application, and details thereof are omitted here.
Additional aspects and advantages of embodiments in accordance with the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments in accordance with the present application.
Drawings
FIG. 1 is a schematic illustration of the operating principle of a compressor cooling system according to an embodiment provided herein;
FIG. 2 is a block diagram illustrating the structure of a hydrogen refueling station according to one embodiment provided herein.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 2 is:
10: a compressor cooling system; 100: a cooling system; 110: a pump body; 120: a gas cooler; 130: a first valve; 140: a flow regulating valve; 150: a controller; 160: a gas line; 170: a second valve; 180: a third valve; 20: a hydrogen station.
Detailed Description
In order that the above objects, features and advantages of embodiments according to the present application may be more clearly understood, embodiments according to the present application will be described in further detail below with reference to the accompanying drawings and detailed description. It should be noted that features of embodiments according to the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments according to the present application, however, embodiments according to the present application may be practiced in other ways than those described herein, and therefore the scope of protection afforded by embodiments according to the present application is not limited by the specific embodiments disclosed below.
Some embodiments provided in accordance with the present application are described below with reference to fig. 1 and 2.
As shown in fig. 1, a compressor cooling system 10 according to an embodiment of the present application includes a plurality of pump assemblies, a cooling system 100, and a plurality of adjustment devices. Specifically, a plurality of pump body assemblies are arranged in series and used for compressing gas. The cooling system 100 is respectively connected with a plurality of pump body assemblies, and the cooling system 100 is used for outputting cooling water to cool the pump body assemblies. Each regulating device is provided between the cooling system 100 and one of the pump block assemblies, and the regulating device is used for regulating the flow rate of the cooling water delivered from the cooling system 100 to the pump block assembly.
The compressor cooling system 10 provided according to the present embodiment includes a plurality of pump body assemblies, a cooling system 100, and a plurality of adjustment devices. The cooling system 100 is used for cooling the pump body assembly by outputting cooling water. Each adjusting device is arranged between the cooling system 100 and one pump body assembly, and the adjusting devices can adjust the flow of cooling water conveyed to the pump body assemblies from the cooling system 100, so that accurate distribution of different cooling amounts of each pump body assembly is realized, and the purposes of accurate temperature control and efficient heat management are achieved. And effectively avoid compressor cooling system 10 overtemperature to appear, promoted compressor cooling system 10's life-span, increased the security of equipment.
Further, the pump body assembly includes a pump body 110 and a gas cooler 120, the pump body 110 being for compressing gas. The gas cooler 120 is communicated with the pump body 110, and generates a large amount of compression heat when the pump body 110 compresses gas, thereby causing a temperature rise, and the gas cooler 120 cools the gas compressed from the pump body 110.
In some embodiments, the regulating device includes a first valve 130 and a flow regulating valve 140. The first valve 130 can communicate with or isolate the cooling system 100 and the pump body assembly as required, and the flow regulating valve 140 is used for regulating the flow of the cooling water. When a plurality of pump body assemblies work together, because the operating mode and the temperature of every pump body assembly are all different, required cooling capacity is also different, through setting up first valve 130 and flow control valve 140, can adjust the switch and the flow of the cooling water of every pump body assembly, realizes the accurate distribution of the different cooling capacities of every pump body assembly. Wherein the first valve 130 may be a solenoid valve.
In other embodiments, the regulating device includes a valve body that can communicate with or isolate the cooling system 100 and the pump body assembly as needed, and can also regulate the flow of cooling water. When a plurality of pump body subassemblies work together, because the operating mode and the temperature of every pump body subassembly are all different, required cooling capacity is also different, through setting up the valve body, can adjust the switch and the flow of the cooling water of every pump body subassembly, realizes the accurate distribution of the different cooling capacities of every pump body subassembly.
In the above embodiment, the compressor cooling system 10 further includes the controller 150, and the controller 150 can respectively control the switch of the first valve 130 and the flow control valve 140 to adjust the flow rate of the cooling water according to the requirement of each pump body assembly, so as to accurately distribute the cooling water to each pump body assembly with different cooling amounts, thereby achieving the purposes of accurate temperature control and efficient heat management.
In the above embodiment, the pump assembly further includes a first temperature sensor and a second temperature sensor, the first temperature sensor and the second temperature sensor are respectively disposed at the gas input end and the gas output end of the pump body 110, and can detect the gas temperature at the gas input end and the gas output end of the pump body 110. The controller 150 can control the opening and closing of the first valve 130 and the opening degree of the flow rate adjustment valve 140 based on the analysis of the gas temperatures detected by the first temperature sensor and the second temperature sensor, thereby achieving different cooling amount supply for different pump body assemblies.
In some embodiments, the compressor cooling system 100 further includes an output pipeline for outputting gas, and a gas pipeline 160, where the gas pipeline 160 connects the pump body 110, the gas cooler 120 and the output pipeline, so that the gas compressed by the pump body 110 can be input into the gas cooler 120 for cooling and then be discharged from the output pipeline, or the gas compressed by the pump body 110 can be input into the gas cooler 120 for cooling and then be input into an adjacent pump body 110 for compression.
In the above embodiment, the compressor cooling system 10 further includes a plurality of second valves 170 and a plurality of third valves 180. A second valve 170 is provided on the gas line 160 between the gas cooler 120 and the output line, and a third valve 180 is provided on the gas line 160 between two adjacent pump body assemblies. The second valve 170 is used to control whether the gas cooled by the gas cooler 120 is delivered to the output line. The third valve 180 is used to control whether the gas cooled by the gas cooler 120 is delivered to the adjacent pump body 110 to be compressed. The controller 150 is electrically connected to the plurality of second valves 170 and the plurality of third valves 180, and the controller 150 may control the opening and closing of the second valves 170 and the third valves 180 as necessary, so that the gas cooled by the gas cooler 120 is directly discharged or is discharged after being compressed for a plurality of times. Wherein the second valve 170 and the third valve 180 may be solenoid valves.
As shown in fig. 2, a hydrogen plant 20 according to an embodiment of the present application includes a compressor cooling system 10 according to any of the above embodiments.
According to the embodiment of the present application, the hydrogen refueling station 20 includes the compressor cooling system 10 according to any of the above embodiments, and thus has all the advantages of the compressor cooling system 10 according to any of the above embodiments, and will not be described herein again.
As shown in fig. 1 and 2, a compressor cooling system 10 according to one embodiment of the present application includes a cooling system 100, a plurality of pumps 110 (including a first pump, a second pump, and an nth pump), a controller 150, a plurality of gas coolers 120, a flow regulating valve 140, a first valve 130, a second valve 170, a third valve 180, and a gas line 160.
The entry gas lets in first pump body, is compressed in first pump body, and the cylinder and the cooling water counterflow heat transfer of first pump body enter into gas cooler 120 after the gas after being compressed comes out from first pump body, and high temperature gas and cooling water counterflow heat transfer in gas cooler 120, and the gas after the heat transfer divide into two tunnel: a second valve 170 is installed on one way and directly discharged from the gas pipe 160; one way is equipped with a third valve 180 for gas entering the second pump body.
The entry gas lets in the second pump body, is compressed in the second pump body, and second pump body cylinder and cooling water countercurrent flow heat transfer enter into gas cooler 120 after the gas after being compressed comes out from the second pump body, and high temperature gas and cooling water countercurrent flow heat transfer in second gas cooler 120, and gas after the heat transfer divide into two the tunnel: a second valve 170 is installed on one way and directly discharged from the gas pipe 160; one way is provided with a third valve 180 which enters the Nth pump body.
The inlet gas is introduced into the Nth pump body and is compressed in the Nth pump body, the cylinder of the Nth pump body performs countercurrent heat exchange with cooling water, the compressed gas enters the gas cooler 120 after coming out of the Nth pump body, high-temperature gas performs countercurrent heat exchange with the cooling water in the gas cooler 120, and the gas pipeline 160 after heat exchange is provided with the second valve 170 and is directly discharged from the gas pipeline 160.
The cooling water flows out from the cooling system 100, and the main cooling water path is divided into N paths: the first path is respectively provided with a first valve 130 and a flow regulating valve 140, then flows through the gas cooler 120 and the first pump body, and finally enters a cooling water pipeline to flow back to the cooling system 100; the second path is respectively provided with a second valve 170 and a flow regulating valve 140, then flows through the gas cooler 120 and the second pump body, and finally enters a cooling water loop to flow back to the cooling system 100; the nth path is installed with the cooling water nth solenoid valve and the flow control valve 140, respectively, and then flows through the gas cooler 120 and the nth pump body, and finally enters the cooling water path to flow back to the cooling system 100.
The controller 150 is connected with the following electrical components through the controller 150: a flow regulating valve 140, a first valve 130, a second valve 170, a third valve 180, a first temperature sensor, and a second temperature sensor. The controller 150 realizes different cooling amount supply for different pump bodies 110 by controlling the opening and closing of the first valve 130 and the opening degree of the flow rate adjustment valve 140 based on analysis of inlet gas side and outlet gas side temperature sensor data before and after compression.
When the compressor is in one-stage compression, the first pump body, the gas cooler 120, the flow regulating valve 140, the first valve 130 and the second valve 170 corresponding to the first pump body are in an open state; the remaining gas cooler 120, the flow regulating valve 140, the first valve 130, the second valve 170, and the third valve 180 are in a closed state. The controller 150 opens the switch of the first valve 130 by analyzing the temperature data of the inlet gas side and outlet gas side temperature sensors of the first pump body before and after compression, and realizes accurate supply of the cooling amount of the first pump body by controlling the valve opening degree of the flow rate adjustment valve 140.
When the compressor is in the two-stage compression mode, the gas cooler 120, the flow regulating valve 140, the first valve 130 and the third valve 180 corresponding to the first pump body and the first pump body are in the open state, the gas cooler 120, the flow regulating valve 140, the first valve 130 and the second valve 170 corresponding to the second pump body and the second pump body are in the open state, and the rest of the gas cooler 120, the flow regulating valve 140, the first valve 130, the second valve 170 and the third valve 180 are in the closed state. The controller 150 opens the switches of the first valve 130 and the second valve 170 by analyzing the temperature data of the inlet gas side and the outlet gas side temperature sensors of the first pump body and the second pump body before and after compression, and realizes accurate supply of different respective cooling amounts of the first pump body and the second pump body by controlling the valve openings of the cooling water flow rate regulating valve 140 and the cooling water flow rate regulating valve 140.
When the compressor is in N-stage compression, the first pump body, the second pump body, the gas cooler 120, the flow regulating valve 140, the first valve 130 and the third valve 180 corresponding to the first pump body and the second pump body are in an open state, and the gas cooler 120, the flow regulating valve 140, the first valve 130 and the second valve 170 corresponding to the Nth pump body and the Nth pump body are in an open state; the remaining second valves 170 are in a closed state. The controller 150 opens the switch of the first valve 130 by analyzing the temperature data of the inlet gas side and outlet gas side temperature sensors of the first pump body, the second pump body, and the nth pump body before and after compression, and realizes accurate supply of different cooling amounts of the first pump body, the second pump body, and the nth pump body by controlling the valve opening degrees of the plurality of flow control valves 140.
The specific embodiment has the following beneficial effects:
1. through the high-efficient distribution and the management of compressor cooling system 10 heat, can realize the accurate distribution of the different cooling capacities of every pump body 110, avoid thermal waste, realize thermal high-efficient utilization and management.
2. Through the thermal high-efficient distribution and the management of compressor cooling system 10, can realize accurate accuse temperature, effectively avoid compressor system overtemperature phenomenon to appear to promote the system life-span, increase the security of equipment.
In embodiments according to the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. Specific meanings of the above terms in the embodiments according to the present application can be understood by those of ordinary skill in the art as the case may be.
In the description of the embodiments according to the present application, it should be understood that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments according to the present application and simplifying the description, but do not indicate or imply that the referred devices or units must have a specific direction, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the embodiments according to the present application.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example in accordance with the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above embodiments are merely preferred embodiments according to the present application, and are not intended to limit the embodiments according to the present application, and those skilled in the art may make various modifications and variations to the embodiments according to the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments according to the present application shall be included in the protection scope of the embodiments according to the present application.
Claims (11)
1. A compressor cooling system, comprising:
a plurality of pump body assemblies arranged in series therebetween, the pump body assemblies being for compressing gas;
the cooling system (100) is respectively connected with the pump body assemblies, and the cooling system (100) is used for outputting cooling water to cool the pump body assemblies;
a plurality of regulating devices, each regulating device being provided between the cooling system (100) and one of the pump block assemblies, for regulating the flow rate of cooling water delivered from the cooling system (100) to the pump block assembly.
2. The compressor cooling system of claim 1, wherein the pump body assembly comprises:
a pump body (110) for compressing a gas;
a gas cooler (120) in communication with the pump body (110), the gas cooler (120) for cooling a gas.
3. The compressor cooling system of claim 2, wherein the adjustment device comprises:
a first valve (130) for communicating or isolating the cooling system (100) with the pump body assembly;
and a flow regulating valve (140) for regulating the flow of the cooling water.
4. The compressor cooling system of claim 2, wherein the adjustment device comprises:
a valve body for communicating or isolating the cooling system (100) with the pump body assembly;
the valve body is also used for adjusting the flow of cooling water.
5. The compressor cooling system of claim 3, further comprising:
the controller (150), the controller (150) is respectively connected with the first valve (130) and the flow regulating valve (140) electrically, and the controller (150) is used for controlling the on-off of the first valve (130) and controlling the flow regulating valve (140) to regulate the flow of the cooling water.
6. The compressor cooling system of claim 5, wherein the pump body assembly further comprises:
the first temperature sensor is arranged at the gas input end of the pump body (110) and is used for detecting the gas temperature;
the second temperature sensor is arranged at the gas output end of the pump body (110) and used for detecting the gas temperature.
7. The compressor cooling system of claim 6,
the controller (150) is also electrically connected with the first temperature sensor and the second temperature sensor, and the controller (150) controls the opening and closing of the first valve (130) and controls the flow regulating valve (140) to regulate the flow of the cooling water according to the gas temperatures detected by the first temperature sensor and the second temperature sensor.
8. The compressor cooling system of claim 6 or 7, further comprising:
the output pipeline is used for outputting gas;
a gas line (160), the gas line (160) communicating the pump body (110), the gas cooler (120), and the output line.
9. The compressor cooling system of claim 8, further comprising:
a plurality of second valves (170), the second valves (170) being disposed on a gas line (160) between the gas cooler (120) and the outlet line;
a plurality of third valves (180), one third valve (180) being disposed on the gas line (160) between two adjacent pump body assemblies.
10. The compressor cooling system of claim 9,
the controller (150) is also electrically connected with the second valve (170) and the third valve (180), and the controller (150) is also used for controlling the opening and closing of the second valve (170) and the third valve (180).
11. A hydrogen station, comprising:
a compressor cooling system according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122391970.7U CN215927718U (en) | 2021-09-30 | 2021-09-30 | Compressor cooling system and hydrogen station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122391970.7U CN215927718U (en) | 2021-09-30 | 2021-09-30 | Compressor cooling system and hydrogen station |
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| Publication Number | Publication Date |
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| CN215927718U true CN215927718U (en) | 2022-03-01 |
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| CN202122391970.7U Active CN215927718U (en) | 2021-09-30 | 2021-09-30 | Compressor cooling system and hydrogen station |
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Effective date of registration: 20221104 Address after: 410016 Floor 2, Mass Entrepreneurship Building, Sany Industrial City, No. 1, Sany Road, Changsha Economic Development Zone Block, Changsha Pilot Free Trade Zone, Hunan Province Patentee after: Sany Hydrogen Energy Co.,Ltd. Address before: 410100 31 industrial city, Changsha economic and Technological Development Zone, Hunan Patentee before: Sany Automobile Manufacturing Co.,Ltd. |