阅读说明：本技术 一种长输热网蒸汽保温管热工性能测试装置及其测试方法 (Long heat transmission network steam heat-preservation pipe thermal performance testing device and testing method thereof ) 是由 王国兴 佴耀 温成 于 2020-05-11 设计创作，主要内容包括：本发明公开了一种长输热网蒸汽保温管热工性能测试装置,包括导热油罐、导热油加热装置、导热油管和保温管测试机构；导热油管包括依次连通导热油罐、导热油加热装置和保温管测试机构流入端的流入管,依次连通保温管测试机构流出端、导热油加热装置和导热油罐的流出管,连通保温管测试机构流出端和导热油加热装置的测试管,保温管测试机构包括设置于围护框内的恒温测试室,待测保温管放置于恒温测试室内的支撑架上。本发明的测试装置,具有加热均匀、调温控制温准确、传热效果好、外界干扰因素小等优点,能够进一步提高测试结果的精确性,因此,利用本装置测试的热工性能数据,可为研究管道产品的热工计算方法和获得通用性理论提供依据。(The invention discloses a long heat transmission network steam heat-preservation pipe thermal performance testing device which comprises a heat conduction oil tank, a heat conduction oil heating device, a heat conduction oil pipe and a heat preservation pipe testing mechanism, wherein the heat conduction oil tank is arranged on the heat conduction oil heating device; the heat conduction oil pipe comprises an inflow pipe which is sequentially communicated with a heat conduction oil tank, a heat conduction oil heating device and a heat insulation pipe testing mechanism inflow end, an outflow pipe which is sequentially communicated with a heat insulation pipe testing mechanism outflow end, a heat conduction oil heating device and a heat conduction oil tank, a testing pipe which is communicated with the outflow end of the heat insulation pipe testing mechanism and the heat conduction oil heating device, the heat insulation pipe testing mechanism comprises a constant temperature testing chamber which is arranged in a surrounding frame, and a heat insulation pipe to be tested is placed on a supporting frame in the constant temperature testing chamber. The testing device has the advantages of uniform heating, accurate temperature regulation and control, good heat transfer effect, small external interference factors and the like, and can further improve the accuracy of the test result, so that the thermotechnical performance data tested by the device can provide a basis for researching a thermotechnical calculation method of a pipeline product and obtaining a universality theory.)

1. The utility model provides a long defeated heat supply network steam insulating tube heat efficiency capability test device which characterized in that: the device comprises a heat conduction oil tank (1), a heat conduction oil heating device (2), a heat conduction oil pipe (3) and a heat preservation pipe testing mechanism (4); the heat conducting oil pipe (3) comprises an inflow pipe, an outflow pipe and a test pipe, wherein the inflow pipe is sequentially communicated with the inflow end of the heat conducting oil tank (1), the heat conducting oil heating device (2) and the heat insulating pipe testing mechanism (4), the outflow end of the heat insulating pipe testing mechanism (4), the heat conducting oil heating device (2) and the heat conducting oil tank (1), the test pipe is communicated with the outflow end of the heat insulating pipe testing mechanism (4) and the heat conducting oil heating device (2), and an oil supplementing pipe for communicating the heat-conducting oil tank (1) and the test pipe, wherein the heat-insulating pipe test mechanism (4) comprises a constant-temperature test chamber (402) arranged in a surrounding frame (408), the heat-insulating pipe (401) to be tested is placed on a support frame (409) in the constant-temperature test chamber (402), one end of the heat-insulating pipe (401) to be tested is connected with an inflow pipe, the other end of the heat-insulating pipe (401) to be tested is connected with an outflow pipe, and a thermocouple (12) and a heat flow meter (13) are attached to the heat preservation pipe (401) to be tested.

2. The device for testing the thermal performance of the steam heat-preservation pipe of the long heat transmission network according to claim 1, characterized in that: be provided with first oil valve (1101) on the inflow pipe between heat conduction oil tank (1) and heat conduction oil heating device (2), second oil valve (1102), second oil pump (1002) and third oil valve (1103) have set gradually on the inflow pipe between heat conduction oil heating device (2) and heat preservation pipe accredited testing organization (4) inflow end, be provided with fourth oil valve (1104) on the outflow pipe between heat preservation pipe accredited testing organization (4) outflow end and heat conduction oil heating device (2), be provided with fifth oil valve (1105) on the outflow pipe between heat conduction oil heating device (2) and heat conduction oil tank (1), seventh oil valve (1107) and first oil pump (1001) have set gradually on the test tube between heat preservation pipe accredited testing organization (4) outflow end and heat conduction oil heating device (2), be provided with sixth oil valve (1106) on the benefit oil pipe.

3. The device for testing the thermal performance of the steam heat-preservation pipe of the long heat transmission network according to claim 1, characterized in that: the constant temperature testing chamber (402) is externally connected with a fan (406) which is positioned outside the enclosure frame (408) through an air supply pipeline (403), the constant temperature testing chamber (402) is externally connected with an air cooler (405) and an electric heater (407) which are positioned outside the enclosure frame (408) through an air return pipeline, and a hygrometer (14) is arranged in the constant temperature testing chamber (402).

4. The device for testing the thermal performance of the steam heat-preservation pipe of the long heat transmission network according to claim 1, characterized in that: the inflow end of the heat preservation pipe (401) to be tested is connected with the inflow pipe through a heat preservation pipe joint (411), and the outflow end of the heat preservation pipe (401) to be tested is connected with the outflow pipe through the heat preservation pipe joint (411).

5. The device for testing the thermal performance of the steam heat-preservation pipe of the long heat transmission network according to claim 1, characterized in that: the thermocouple (12), the heat flow meter (13) and the hygrometer (14) are all connected with the data exchange module (7) through signal cables (5), the data exchange module (7) is connected with an industrial control computer (8) of a printer (9) through the signal cables (5), the industrial control computer (8) is connected with the automatic control module (6) through a signal cable (5), the automatic control module (6) is respectively connected with the first oil pump (1001), the heat-conducting oil level meter (201), the heat-conducting oil heating device (2) and the second oil pump (1002) through signal cables (5), the data exchange module (7) is also connected with a thermocouple arranged at the top of the heat-conducting oil heating device (2), a thermocouple arranged at an inflow pipe at the inflow end of the heat-insulating pipe testing mechanism (4) and a thermocouple arranged at an outflow pipe at the outflow end of the heat-insulating pipe testing mechanism (4) through a signal cable (5).

6. The device for testing the thermal performance of the steam heat-preservation pipe of the long heat transmission network according to claim 1, characterized in that: the heat preservation pipe testing mechanism (4) further comprises a power supply (412) and a control console (413), and the control console (413) is connected with the power supply (412), the fan (406), the air cooler (405) and the electric heater (407).

7. The device for testing the thermal performance of the steam heat-preservation pipe of the long heat transmission network according to claim 2, characterized in that: and one end of the seventh oil valve (1107) connected with the first oil pump (1001) is connected into the test tube through a flexible metal tube (15).

8. The device for testing the thermal performance of the steam heat-preservation pipe of the long heat transmission network according to claim 1, characterized in that: the heat preservation pipe (401) to be tested is a working steel pipe (4013), a heat preservation material layer (4012) and an outer steel protection pipe (4011) from inside to outside in sequence.

9. The device for testing the thermal performance of the steam heat-preservation pipe of the long heat transmission network according to claim 1, characterized in that: the method comprises the following working modes:

the first working mode is as follows: opening a first oil valve (1101), a second oil valve (1102), a third oil valve (1103), a fourth oil valve (1104) and a fifth oil valve (1105), closing the rest oil valves, and under the power of a second oil pump (1002), enabling heat conduction oil borne in the heat conduction oil tank (1) to flow into a heat conduction oil heating device (2) from the heat conduction oil tank (1), enabling the inflow end of a self-heat-preservation pipe testing mechanism (4) to flow into a heat-preservation pipe testing mechanism (4), enabling the outflow end of the self-heat-preservation pipe testing mechanism (4) to flow back to the heat conduction oil heating device (2) after flowing out, and finally flowing back to the heat conduction oil tank (1) to form a heat-preservation pipe heat-conduction oil filling loop to be tested, wherein the heat conduction oil filling loop of the heat-;

and a second working mode: opening a second oil valve (1102), a third oil valve (1103) and a seventh oil valve (1107), closing other oil valves, forming a thermal performance test loop of the thermal insulation pipe to be tested between a heat conduction oil heating device (2) and the thermal insulation pipe (401) to be tested by the heat conduction oil tank (1) under the power provided by a first oil pump (1001) and a second oil pump (1002), and carrying out thermal performance test on the thermal insulation pipe to be tested by the thermal performance test loop of the thermal insulation pipe to be tested;

and a third working mode: and in the second working mode, the sixth oil valve (1106) is opened, and the heat conduction oil tank (1) supplies heat conduction oil to the thermal performance test loop of the to-be-tested heat insulation pipe under the power provided by the first oil pump (1001) and the second oil pump (1002).

10. The testing method of the thermal performance testing device of the long heat transmission network steam heat-preservation pipe according to any one of claims 1 to 9, characterized by comprising the following steps: horizontally placing a heat-insulating pipe (401) to be tested on a supporting frame (419) in a constant-temperature testing chamber (402), adjusting the temperature in the constant-temperature testing chamber (402) to be 25 ℃, opening a first oil valve (1101), a second oil valve (1102), a third oil valve (1103), a fourth oil valve (1104) and a fifth oil valve (1105), filling heat-conducting oil in a heat-conducting oil tank (1) into the heat-insulating pipe (401) to be tested after being heated in a heat-conducting oil heating device (2) under the power of a second oil pump (1002), then closing the fourth oil valve (1104) and the fifth oil valve (1105), opening a seventh oil valve (1107), circulating the heat-conducting oil between the heat-conducting oil heating device (2) and the heat-insulating pipe (401) to be tested under the power of the first oil pump (1001) and the second oil pump (1002), selecting two testing sections perpendicular to the axial center of the heat-insulating pipe (401) to be tested on the heat-insulating pipe (401) to be tested, on each test section, 3 temperature measuring points are respectively arranged on a working steel pipe (4013), a heat insulation material layer (4012) and an outer steel protection pipe (4011), and 3 heat flow measuring points are arranged on the outer surface of the outer steel protection pipe (4011); and after the heat conducting oil is stably circulated for 2-3 days, testing each temperature measuring point and each heat flow measuring point for 10 times and then averaging.

Technical Field

The invention relates to the technical field of thermal performance testing of heat preservation pipes, in particular to a thermal performance testing device and a testing method for a steam heat preservation pipe of a long heat transmission network.

Background

When the long-distance heat transmission network is subjected to heat preservation treatment, the thermal performance of the heat preservation pipe is an important standard for evaluating the heat transmission network. For example, the thickness of the insulating material is determined according to the thermal performance of the insulating pipe. In general, the thermal performance of the insulating pipe can be obtained by two ways of theory and experiment. Theoretically, starting from the microstructure of the heat-insulating material, a heat-conducting physical model is established by researching the heat-conducting mechanism of the material on the basis of quantum mechanics and statistical mechanics, and the thermal performance of the heat-insulating pipe can be obtained through complex mathematical analysis and calculation. However, because the theoretical applicability is limited, and with the rapid increase of new materials, people have not found a theoretical equation which is accurate enough and is applicable to a wide range so far, the exploration of the thermal performance experimental test method and technology of the thermal insulation pipe is still a main source of thermal performance data of the thermal insulation pipe. Therefore, a set of suitable device for testing the thermal performance of the steam heat-insulating pipe is developed, the device has great influence on the movement working condition of the steam pipeline system, and has important significance on improving the heat efficiency of the steam pipeline system and saving resources.

Disclosure of Invention

The invention provides a device and a method for testing the thermal performance of a steam heat-preservation pipe of a long heat transmission network, and aims to solve the problems in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that:

a long heat transmission network steam heat preservation pipe thermal performance testing device comprises a heat conduction oil tank 1, a heat conduction oil heating device 2, a heat conduction oil pipe 3 and a heat preservation pipe testing mechanism 4; the heat conduction oil pipe 3 is including the inlet tube that communicates heat conduction oil tank 1, conduction oil heating device 2 and 4 inflow ends of insulating tube accredited testing organization in proper order, the outlet tube that communicates 4 outflow ends of insulating tube accredited testing organization, conduction oil heating device 2 and heat conduction oil tank 1 in proper order, the test tube that communicates 4 outflow ends of insulating tube accredited testing organization and conduction oil heating device 2 to and the benefit oil pipe of intercommunication heat conduction oil tank 1 and test tube, the insulating tube accredited testing organization 4 is including setting up the constant temperature test chamber 402 in enclosing frame 408, and the insulating tube 401 that awaits measuring is placed on the support frame 409 in constant temperature test chamber 402, and the inlet tube is connected to the one end of the insulating tube 401 that awaits measuring, and the outlet tube is connected to the other end of the insulating tube 401 that awaits measuring, attached thermocouple 12 and heat flow.

Further, a first oil valve 1101 is arranged on an inflow pipe between the heat-conducting oil tank 1 and the heat-conducting oil heating device 2, a second oil valve 1102, a second oil pump 1002 and a third oil valve 1103 are sequentially arranged on the inflow pipe between the heat-conducting oil heating device 2 and the inflow end of the heat-insulating pipe testing mechanism 4, a fourth oil valve 1104 is arranged on an outflow pipe between the outflow end of the heat-insulating pipe testing mechanism 4 and the heat-conducting oil heating device 2, a fifth oil valve 1105 is arranged on an outflow pipe between the heat-conducting oil heating device 2 and the heat-conducting oil tank 1, a seventh oil valve 1107 and a first oil pump 1001 are sequentially arranged on a testing pipe between the outflow end of the heat-insulating pipe testing mechanism 4 and the heat-conducting oil heating device 2, and a sixth oil valve 1106 is arranged on the oil supplementing pipe.

Further, the heat conducting oil in the heat conducting oil tank 1 is heated by the heat conducting oil heating device 2 and the temperature is controlled by the automatic control module 6, and the temperature fluctuation range is +/-0.2 ℃. The heat conducting oil heating device 2 adopts an ADDC series product produced by Suzhou Oddy mechanical company Limited. The automatic control module 6 adopts a CPA101-220 intelligent control module produced by Fuless valve control Co., Ltd, Yangzhou city, and the data exchange module 7 adopts a TH08 series product produced by Huapu microelectronics Co., Ltd.

Further, the constant temperature testing chamber 402 is externally connected with a fan 406 positioned outside the enclosure frame 408 through an air supply pipeline 403, the constant temperature testing chamber 402 is externally connected with an air cooler 405 and an electric heater 407 positioned outside the enclosure frame 408 through an air return pipeline, and a hygrometer 14 is arranged in the constant temperature testing chamber 402.

Further, the inflow end of the thermal insulation pipe 401 to be tested is connected with the inflow pipe through a thermal insulation pipe joint 411, and the outflow end of the thermal insulation pipe 401 to be tested is connected with the outflow pipe through the thermal insulation pipe joint 411.

Furthermore, the thermocouple 12, the heat flow meter 13 and the hygrometer 14 are all connected with the data exchange module 7 through signal cables, the data exchange module 7 is connected with the industrial control computer 8 connected with the printer 9 through a signal cable 5, the industrial control computer 8 is connected with an automatic control module 6 through a signal cable 5, the automatic control module 6 is respectively connected with a first oil pump 1001, a heat-conducting oil level meter 201, a heat-conducting oil heating device 2 and a second oil pump 1002 through the signal cable 5, the data exchange module 7 is also connected with a thermocouple arranged at the top of the heat-conducting oil heating device 2, a thermocouple arranged at an inflow pipe at the inflow end of the heat-insulating pipe testing mechanism 4 and a thermocouple arranged at an outflow pipe at the outflow end of the heat-insulating pipe testing mechanism 4 through a signal cable 5, namely, the temperature of the heat transfer oil in the heat transfer oil heating device 2 and the temperature of the heat transfer oil at the inlet and the outlet of the heat preservation pipe 401 to be detected are detected.

Further, the heat preservation pipe testing mechanism 4 further comprises a power supply 412 and a control console 413, the control console 413 is connected with the power supply 412, a fan 406, an air cooler 405 and an electric heater 407, air is supplied from a ceiling on the four walls of the constant temperature testing chamber 402 through the air supply pipeline 403, air is returned from the bottom of the four walls of the constant temperature testing chamber 402 through the air return pipeline, the air cooler 405 and the electric heater 407 at the inlet of the fan 406 are used for controlling and adjusting the supply air temperature, the hygrometer 14 is used for measuring the humidity of the constant temperature testing chamber 402, the thermocouple 12 and the heat flow meter 13 are used for measuring the temperature and the heat flow of the heat preservation pipe 401 to be tested, the control console 413 is used for controlling the on and off of the air cooler 405 and the electric heater 407, the air temperature in the constant temperature testing chamber 402 is guaranteed to be maintained at about 25 ℃, the control precision is +/-2 ℃, the model of the air cooler 405 is SR-L QG20, the model of the fan 406 is WEXD, the model of the electric heater 407 is TH-D-L8 KW, the model of the control console 413 is WP-C80, the model of the oil pump 412 is manufactured by TK-C series, the oil pump is used for controlling the oil pump by adopting a linear TK-D-368 series production system, and the industrial control module 13, and the.

Further, one end of the seventh oil valve 1107 connected to the first oil pump 1001 is connected to the test tube through a flexible metal tube 15.

Further, the inflow pipe is located at the lower sections of the heat conduction oil tank 1 and the heat conduction oil heating device 2, the outflow pipe is located at the upper sections of the heat conduction oil tank 1 and the heat conduction oil heating device 2, the oil supplementing pipe is located at the lower section of the heat conduction oil tank 1, and the testing pipe is located at the lower section of the heat conduction oil heating device 2.

Further, the heat preservation pipe 401 to be tested is a working steel pipe 4013, a heat preservation material layer 4012 and an outer steel protection pipe 4011 from inside to outside in sequence.

Further, a pressure gauge 101 is arranged on the top of the heat conducting oil tank 1.

Further, an oil discharge pipe with an eighth oil valve 1108 is arranged at the bottom of the heat-conducting oil tank 1, an oil discharge pipe with a ninth oil valve 1109 is arranged at the bottom of the heat-conducting oil heating device 2, and an oil discharge pipe with a tenth oil valve 1110 is further connected to the joint of the flexible metal pipe 15 and the heat-conducting oil pipe 3.

Further, a test pipe blow-off valve 412 is arranged on a heat preservation pipe joint 411 connected with the outflow end of the heat preservation pipe 401 to be tested, and an eleventh oil valve 1111 is arranged on a channel between the heat preservation pipe joint 413 and the test pipe blow-off valve 412.

Further, a release valve 202 is arranged at the top of the heat conduction oil heating device 2, a twelfth oil valve 1112 is arranged on a channel between the heat conduction oil heating device 2 and the release valve 202, and a heat conduction oil level meter 201 is further arranged on the heat conduction oil heating device 2.

Further, a long heat transmission network steam insulating pipe thermal performance testing arrangement, includes following three kinds of mode, mode one: opening a first oil valve 1101, a second oil valve 1102, a third oil valve 1103, a fourth oil valve 1104 and a fifth oil valve 1105, closing the rest oil valves, enabling the heat conduction oil carried in the heat conduction oil tank 1 to flow into a heat conduction oil heating device 2 from the heat conduction oil tank 1 under the power of a second oil pump 1002, enabling the inflow end of a self-heat-preservation pipe testing mechanism 4 to flow into a heat-preservation pipe testing mechanism 4, enabling the outflow end of the self-heat-preservation pipe testing mechanism 4 to flow back to the heat conduction oil heating device 2 after flowing out, and finally flowing back to the heat conduction oil tank 1 to form a heat-preservation pipe heat-conduction oil filling loop to be tested, wherein the heat conduction oil filling loop of the heat-preservation pipe to;

and a second working mode: opening a second oil valve 1102, a third oil valve 1103 and a seventh oil valve 1107, closing other oil valves, and under the power provided by a first oil pump 1001 and a second oil pump 1002, forming a thermal performance test loop of the heat-conducting oil tank 1 between the heat-conducting oil heating device 2 and the heat-insulating pipe 401 to be tested, and carrying out a thermal performance test on the heat-insulating pipe to be tested by the thermal performance test loop of the heat-conducting oil tank 1;

and a third working mode: in the second working mode, the sixth oil valve 1106 is opened, and the heat conduction oil tank 1 supplies heat conduction oil to the thermal performance test loop of the thermal insulation pipe to be tested under the power provided by the first oil pump 1001 and the second oil pump 1002.

A long heat transmission network steam heat preservation pipe thermal performance test method comprises the following steps: horizontally placing a heat-insulating pipe 401 to be tested on a supporting frame 419 in a constant-temperature test chamber 402, adjusting the temperature in the constant-temperature test chamber 402 to be 25 ℃, opening a first oil valve 1101, a second oil valve 1102, a third oil valve 1103, a fourth oil valve 1104 and a fifth oil valve 1105, under the power of a second oil pump 1002, heating heat-conducting oil in a heat-conducting oil tank 1 in a heat-conducting oil heating device 2, filling the heat-conducting oil into the heat-insulating pipe 401 to be tested, then closing the fourth oil valve 1104 and the fifth oil valve 1105, opening a seventh oil valve 1107, under the power of the first oil pump 1001 and the second oil pump 1002, circulating the heat-conducting oil between the heat-conducting oil heating device 2 and the heat-insulating pipe 401 to be tested, selecting two test sections perpendicular to the axial center of the heat-insulating pipe 401 to be tested, and respectively arranging 3 temperature measuring points on a working steel pipe 4013, a heat-insulating material layer 4012 and an outer steel pipe 4011 on each test section, 3 heat flow measuring points are arranged on the outer surface of the outer steel protective pipe 4011; and after the heat conducting oil is stably circulated for 2-3 days, testing each temperature measuring point and each heat flow measuring point for 10 times and then averaging. The thermocouple 15 is arranged on the thermal insulation pipe 401 to be measured, and the measurement precision is as follows: the temperature of the temperature measuring point is measured at +/-0.5 ℃, and a heat flow meter 16 is arranged on the heat preservation pipe 401 to be measured to measure the heat flow density of the heat flow measuring point.

Compared with the prior art, the invention has the following beneficial effects:

the testing device has the advantages of uniform heating, accurate temperature regulation and control, good heat transfer effect, small external interference factors and the like, and can further improve the accuracy of a testing result; meanwhile, the device can stably maintain the test environment temperature at about 25 ℃, can provide a basis for researching a thermotechnical calculation method of a pipeline product and obtaining a universality theory, and can be widely applied to production enterprises, related quality detection departments, units and the like of heat-resistant and heat-insulating materials.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a thermal insulation pipe testing mechanism according to the present invention;

FIG. 3 is a schematic structural diagram of the thermal insulation pipe to be tested according to the present invention;

wherein: 1-heat conducting oil tank, 101-pressure gauge, 2-heat conducting oil heating device, 201-heat conducting oil level gauge, 202-air release valve, 3-heat conducting oil pipe, 4-heat insulating pipe testing mechanism, 401-heat insulating pipe to be tested, 4011-steel outer protecting pipe, 4012-heat insulating material layer, 4013-working steel pipe, 402-constant temperature testing chamber, 403-air supply pipeline, 404-air return pipeline, 405-air cooler, 406-blower, 407-electric heater, 408-enclosure frame, 409-support frame, 410-test pipe air release valve, 411-heat insulating pipe joint, 412-power supply, 413-control console, 5-signal cable, 6-automatic control module, 7-data exchange module, 8-industrial control computer, 9-printer, 1001-first oil pump, 1002-second oil pump, 1101-first oil valve, 1102-second oil valve, 1103-third oil valve, 1104-fourth oil valve, 1105-fifth oil valve, 1106-sixth oil valve, 1107-seventh oil valve, 1108-eighth oil valve, 1109-ninth oil valve, 1110-tenth oil valve, 1111-eleventh oil valve, 1112-twelfth oil valve, 12-thermocouple, 13-heat flow meter, 14-hygrometer, 15-flexible metal tube.

Detailed Description

The present invention will be further described with reference to the following examples.

The parts adopted in the invention are purchased from the market, and are the prior art, specifically, the heat conducting oil heating device 2 adopts ADDC series products produced by Suzhou Ode machinery Co., Ltd, the automatic control module 6 adopts CPA101-220 intelligent control module produced by Fuless valve control Co., Ltd, Yangzhou city, the data exchange module 7 adopts TH08 series products produced by Huapu microelectronics Co., Ltd, the air cooler 405 is SR-L QG20, the fan 406 is WEXD, the electric heater 407 is TH-D-L8 KW, the control console 413 is TKWP-C80, and the power supply 412 adopts X series linear power supply produced by Beijing Xinyu Co., Ltd.