A large-scale ice-coating test device and method for a fast rotating hub

Abstract

The application discloses a large fast rotating wheel hub icing test device and method, the device comprises a pure water unit, a pre-cooling water tank, an icing nozzle, a liquid nitrogen tank, a liquid nitrogen nozzle, an air compressor, a gas pressure stabilizing tank and a wheel hub; the water outlet pipeline of the pure water unit is connected with the water inlet of the pre-cooling water tank; the air compressor is connected with the air inlet side of the gas pressure stabilizing tank, the air outlet side of the gas pressure stabilizing tank is connected with the water outlet pipeline of the pre-cooling water tank and the icing nozzle; the icing nozzle is arranged on one side of the wheel hub and faces the inner circumferential surface of the wheel hub; the liquid nitrogen tank is connected with the pre-cooling water tank and the liquid nitrogen nozzle; the liquid nitrogen nozzle is arranged on one side of the wheel hub and faces the inner circumferential surface of the wheel hub. The icing test device can control the icing state by adjusting the air pressure, water pressure and wheel hub rotating speed, can accurately restore the icing conditions such as glaze, rime and mixed rime in an open environment, and can meet various test requirements.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of icing devices, and particularly relates to an icing test device and method for a large-scale fast rotating hub. BACKGROUND

[0002] In winter, icing accidents caused by circuit icing, road icing and mechanical equipment icing occur from time to time. Transmission line icing causes tripping, pole falling, overall power failure and other accidents, which seriously affect power supply safety. In cold seasons, the problem of ice on the runway occurs. When the runway is iced, a thin ice layer is first formed, and then the ice layer area expands, and the road surface will form ice at this time. The friction coefficient of the road surface will decrease sharply, and the road surface will be very smooth, which will affect the normal take-off and landing of the aircraft, and even cause personnel casualties. Road icing causes vehicle tires to slip, causing traffic accidents. Wind turbine blades, aircraft components and other mechanical equipment icing seriously affect equipment performance, reduce operating efficiency and even cause accidents. Therefore, it is of great significance to study the icing characteristics of the road surface or equipment, monitor the formation of ice and eliminate icing disasters for the transportation, power and energy industries.

[0003] At present, the methods for studying icing characteristics at home and abroad include theoretical analysis method, test device simulation method and natural environment test method. Among them, the test device simulation method is used to establish an icing simulation device to artificially simulate icing conditions, which can more directly observe the test results. The existing icing test device is mostly set in a closed and insulated environment, and the icing simulation is realized by using a refrigeration unit for refrigeration and a spray head for spraying supercooled water. However, there is a lack of relevant test devices for the icing simulation of large-scale fast rotating test pieces in an open environment. SUMMARY

[0004] The purpose of the present application is to provide an icing test device and method for a large-scale fast rotating hub, which can accurately control the test temperature and icing thickness by controlling the air pressure, water pressure and hub rotating speed, and realize various icing conditions such as glaze icing, rime icing and mixed icing in an open environment.

[0005] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0006] In the first aspect of the present application, an icing test device for a large-scale fast rotating hub is provided, which comprises a pure water unit, a pre-cooling water tank, an icing spray head, a liquid nitrogen tank, a liquid nitrogen spray head, an air compressor, a gas pressure stabilizing tank and a hub.

[0007] The water outlet pipeline of the pure water unit is connected to the water inlet of the pre-cooling water tank.

[0008] The air compressor is connected to the air inlet side of the gas pressure stabilizing tank, and the air outlet side of the gas pressure stabilizing tank is connected to the icing spray head together with the water outlet pipeline of the pre-cooling water tank.

[0009] The icing nozzle is arranged on one side of the hub and faces the inner circumferential surface of the hub;

[0010] The liquid nitrogen tank is connected to the pre-cooling water tank and the liquid nitrogen nozzle respectively;

[0011] The liquid nitrogen nozzle is arranged on one side of the hub and faces the inner circumferential surface of the hub.

[0012] As an optional solution of the present application, the water inlet of the pure water unit is connected with a tap water supply pipe.

[0013] As an optional solution of the present application, an electric stirrer is arranged in the pre-cooling water tank.

[0014] As an optional solution of the present application, a first electric regulating valve is arranged on the water outlet pipeline of the pre-cooling water tank connected with the icing nozzle.

[0015] As an optional solution of the present application, the liquid nitrogen tank is connected to the pre-cooling water tank and the liquid nitrogen nozzle through a pipeline and a three-way regulating valve respectively.

[0016] As an optional solution of the present application, a third electric regulating valve is arranged between the gas pressure stabilizing tank and the icing nozzle.

[0017] As an optional solution of the present application, the gas pressure stabilizing tank is also communicated with the water outlet pipeline of the pre-cooling water tank through a second electric regulating valve.

[0018] As an optional solution of the present application, the first end of the second electric regulating valve is connected on the pipeline between the gas pressure stabilizing tank and the third electric regulating valve, and the second end of the second electric regulating valve is connected with the water outlet pipeline of the pre-cooling water tank.

[0019] As an optional solution of the present application, a non-contact temperature sensor is arranged on the back of the liquid nitrogen nozzle.

[0020] In the second aspect of the present application, a test method of the icing test device of the large-sized fast rotating hub is provided, which comprises the following steps:

[0021] 1) First, turn on the motor of the hub (11);

[0022] 2) Then, prepare pure water by the pure water unit (2), and stop when the water level rises to the preset position of the pre-cooling water tank (3);

[0023] 3) Open the three-way regulating valve (5) to make a part of liquid nitrogen enter the pre-cooling water tank (3) for pre-cooling; when the water temperature in the pre-cooling water tank (3) is 2-5℃, close the valve on the pipeline of the pre-cooling water tank (3) connected with the three-way regulating valve (5).

[0024] 4) Directly spray liquid nitrogen to the module of the inner surface of the hub (11) through the liquid nitrogen spray head (12);

[0025] 5) When the non-contact temperature sensor (14) detects that the surface temperature of the module is about-25℃, turn on the icing spray head (13), control the water flow and air pressure by adjusting the first electric regulating valve (4) and the third electric regulating valve (10), adjust the particle diameter of the spray head, and form various icing states on the inner surface of the hub (11);

[0026] 6) After the experiment is completed, close the first electric regulating valve (4), the third electric regulating valve (10) and the three-way regulating valve (5), and open the second electric regulating valve (9) to perform pipeline purging.

[0027] Compared with the prior art, the beneficial effects of the present application are as follows:

[0028] 1) The icing test device of the present application comprises a pure water unit, a pre-cooling water tank, an icing spray head, a liquid nitrogen tank, a liquid nitrogen spray head, an air compressor, a gas pressure stabilizing tank and a hub, and the icing state is controlled by adjusting the air and water pressure and the hub speed, which can accurately reproduce the icing conditions of rain, rime, mixed rime and the like in an open environment, and meet various test requirements.

[0029] 2) In the present application, the icing test uses pre-cooled pure water with a temperature of 2-5℃ as the icing water source, which not only prevents the spray head and pipeline from being blocked due to fouling, but also accelerates the condensation speed of water mist and effectively shortens the icing time.

[0030] 3) The icing test device of the present application uses liquid nitrogen as the cooling source, which has the characteristics of low gasification temperature, high cooling efficiency, non-toxicity and harmlessness, and can realize safe and rapid cooling in an open environment, and the icing test is not easily affected by the surrounding environment temperature. Compared with the traditional refrigeration unit, the liquid nitrogen refrigeration system also has the advantages of low installation and operation cost, and does not require a containment structure, which greatly reduces the installation and maintenance cost.

[0031] 4) The non-contact temperature sensor of the present application is arranged on the back side of the liquid nitrogen spray head, which not only avoids the influence of the gasification process of liquid nitrogen on the temperature sensor, but also simplifies the system circuit and avoids the winding of the wiring when the hub rotates. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof, explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0033] Figure 1 is a structural schematic diagram of the icing test device of the present application.

[0034] Figure 2 is a working method flow chart of the ice coating test device of the embodiment of the present application.

[0035] Symbol explanation: 1 - tap water supply pipe; 2 - pure water unit; 3 - pre-cooling water tank; 4 - first electric regulating valve; 5 - three-way regulating valve; 6 - liquid nitrogen tank; 7 - air compressor; 8 - gas pressure stabilizing tank; 9 - second electric regulating valve; 10 - third electric regulating valve; 11 - hub; 12 - liquid nitrogen spray head; 13 - ice coating spray head; 14 - non-contact temperature sensor. DETAILED DESCRIPTION

[0036] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0037] The following detailed description is exemplary description and is intended to provide further detailed description of the present application. Unless otherwise specified, all technical terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs. The terms used in the present application are only for the purpose of describing the specific embodiments and are not intended to limit the exemplary embodiments according to the present application.

[0038] As shown in Figure 1 In order to solve the problem of lacking of fast rotating ice coating device in open environment, the first aspect of the embodiment of the present application provides a large-scale fast rotating hub ice coating test device, which comprises a pure water unit 2, a pre-cooling water tank 3, an ice coating spray head 13, a liquid nitrogen tank 6, a liquid nitrogen spray head 12, an air compressor 7, a gas pressure stabilizing tank 8 and a hub 11.

[0039] The water outlet pipeline of the pure water unit 2 is connected to the water inlet of the pre-cooling water tank 3, and the water inlet of the pure water unit 2 is connected to the tap water supply pipe 1; the water source of the pure water unit 2 is connected to the tap water pipe 1, and after being purified by the pure water unit 2 to an electric conductivity of ≤10 μs / cm, it is sent to the pre-cooling water tank 3.

[0040] The air compressor 7 is connected to the gas inlet side of the gas pressure stabilizing tank 8, the gas outlet side of the gas pressure stabilizing tank 8 is connected to the ice coating spray head 13 together with the water outlet pipeline of the pre-cooling water tank 3; the first electric regulating valve 4 is arranged on the water outlet pipeline of the pre-cooling water tank 3 connected to the ice coating spray head 13, and the third electric regulating valve 10 is arranged between the gas outlet side of the gas pressure stabilizing tank 8 and the ice coating spray head 13.

[0041] The ice coating spray head 13 is arranged on one side of the hub 11 and faces the inner circumferential surface of the hub 11; the non-contact temperature sensor 14 is arranged on the back of the liquid nitrogen spray head 12, the temperature sensor 14 can detect the surface temperature of the hub and upload the detected data to the PLC system to realize closed-loop control of the whole system.

[0042] The liquid nitrogen tank 6 is connected to the pre-cooling water tank 3 and the liquid nitrogen spray head 12 through pipes and a three-way regulating valve 5 as a cold source, and the liquid nitrogen spray head 12 is used for cooling the hub 11.

[0043] The liquid nitrogen spray head 12 is arranged on one side of the hub 11 and faces the inner circumferential surface of the hub 11. The liquid nitrogen spray head 12 sprays liquid nitrogen to cool the module of the inner surface of the hub 11 to ≤-25℃ before the icing test is performed. After the module of the inner surface of the hub 11 is cooled to ≤-25℃, the water flow, water pressure and air pressure are adjusted through the first electric regulating valve 4 and the second electric regulating valve 10, respectively, the rotation speed of the hub 11 is changed to control the icing state, and various icing conditions such as glaze, rime, mixed rime and the like can be realized in an open environment.

[0044] As an optional solution of the present application, an electric stirrer is arranged in the pre-cooling water tank 3, and the pure water in the pre-cooling water tank 3 can be uniformly pre-cooled to 2-5℃.

[0045] As an optional solution of the present application, the gas outlet side of the gas pressure stabilizing tank 8 is also communicated with the water outlet pipe of the pre-cooling water tank 3 through a second electric regulating valve 9. As an optional solution of the present application, the first end of the second electric regulating valve 9 is connected to the pipe between the gas outlet side of the gas pressure stabilizing tank 8 and the third electric regulating valve 10, and the second end of the second electric regulating valve 9 is connected to the water outlet pipe of the pre-cooling water tank 3.

[0046] As shown in Figure 2 The second aspect of the embodiment of the present application provides a test method of the above-mentioned large-scale fast rotating hub icing test device, which comprises the following steps:

[0047] S1: First, turn on the motor of the hub 11 to make it rotate at a speed of about 30-60r / min.

[0048] S2: Then, turn on the pure water unit 2 to prepare pure water, and stop when the water level rises to the preset high position of the pre-cooling water tank 3.

[0049] S3: Open the three-way regulating valve 5 to make a part of the liquid nitrogen enter the pre-cooling water tank 3 for pre-cooling; when the water temperature in the pre-cooling water tank 3 is 2-5℃, close the valve of the pipe leading to the pre-cooling water tank 3.

[0050] S4: Use the low-temperature liquid nitrogen medium to spray liquid nitrogen directly to the module of the inner surface of the hub 11 through the liquid nitrogen spray head 12 to reduce the temperature of the module.

[0051] S5: The non-contact temperature sensor 14 detects the surface temperature of the module, and the temperature detected by the sensor can be uploaded to the PLC system. When the surface temperature of the module is about -25 DEG C, the ice spraying nozzle 13 is opened, and the water flow and air pressure are controlled by adjusting the first electric regulating valve 4 and the third electric regulating valve 10, and the particle diameter of the nozzle is adjusted, so that a plurality of icing states such as rime, graupel and mixed rime are formed on the inner surface of the hub 11 in a short time.

[0052] As an example of this step, the water flow is adjusted to 60±20 L / (h·m2), the median volume diameter of water droplets is 25 μm, and the liquid water content in the air is 0.8 g / m3, so that the rime icing condition can be quickly realized.

[0053] S6: After the experiment is completed, the first electric regulating valve 4, the third electric regulating valve 10 and the three-way regulating valve 5 are closed, and the second electric regulating valve 9 is opened, so that the pipeline is purged.

[0054] It is to be understood by those skilled in the art that the present application can be implemented by other embodiments without departing from the spirit or essential characteristics thereof. Therefore, the above disclosed embodiments are merely exemplary and are not the only ones. All changes within the scope of the present application or within the scope equivalent to the present application are intended to be included in the present application.

Claims

1. A test method of an icing test device for a large-sized rapidly rotating hub, characterized by, The method comprises the following steps: 1) first open the motor of the wheel hub (11); 2) then open the pure water unit (2) to produce pure water, and stop when the water level rises to the preset position of the pre-cooling water tank (3); 3) open the three-way regulating valve (5) to make part of the liquid nitrogen enter the pre-cooling water tank (3) for pre-cooling; when the water temperature in the pre-cooling water tank (3) is 2-5 DEG C, close the three-way regulating valve (5) in the pipeline to the pre-cooling water tank (3); 4) spray liquid nitrogen directly to the module on the inner surface of the wheel hub (11) through the liquid nitrogen nozzle (12); 5) when the surface temperature of the module detected by the non-contact temperature sensor (14) is about -25 DEG C, open the icing nozzle (13), control the water flow and air pressure by adjusting the first electric regulating valve (4) and the third electric regulating valve (10), adjust the particle diameter of the nozzle, and form various icing states on the inner surface of the wheel hub (11); 6) after the experiment is completed, close the first electric regulating valve (4), the third electric regulating valve (10) and the three-way regulating valve (5), and open the second electric regulating valve (9) to perform pipeline purging. The icing test device for the large-scale fast rotating wheel hub comprises a pure water unit (2), a pre-cooling water tank (3), an icing nozzle (13), a liquid nitrogen tank (6), a liquid nitrogen nozzle (12), an air compressor (7), a gas pressure stabilizing tank (8) and a wheel hub (11). The water outlet pipeline of the pure water unit (2) is connected to the water inlet of the pre-cooling water tank (3). The air inlet side of the air compressor (7) is connected to the gas inlet side of the gas pressure stabilizing tank (8), and the gas outlet side of the gas pressure stabilizing tank (8) is connected to the water outlet pipeline of the pre-cooling water tank (3) and the icing nozzle (13) together. The icing nozzle (13) is arranged on one side of the wheel hub (11) and faces the inner circumferential surface of the wheel hub (11). The liquid nitrogen tank (6) is connected to the pre-cooling water tank (3) and the liquid nitrogen nozzle (12) respectively. The liquid nitrogen nozzle (12) is arranged on one side of the wheel hub (11) and faces the inner circumferential surface of the wheel hub (11). The first electric regulating valve (4) is arranged on the water outlet pipeline of the pre-cooling water tank (3) connected to the icing nozzle (13). The liquid nitrogen tank (6) is connected to the pre-cooling water tank (3) and the liquid nitrogen nozzle (12) through the pipeline and the three-way regulating valve (5) respectively. The third electric regulating valve (10) is arranged between the gas outlet side of the gas pressure stabilizing tank (8) and the icing nozzle (13). The gas outlet side of the gas pressure stabilizing tank (8) is also communicated with the water outlet pipeline of the pre-cooling water tank (3) through the second electric regulating valve (9). The first end of the second electric regulating valve (9) is connected to the pipeline between the gas outlet side of the gas pressure stabilizing tank (8) and the third electric regulating valve (10), and the second end of the second electric regulating valve (9) is connected to the water outlet pipeline of the pre-cooling water tank (3).

2. The icing test method for a large-sized rapidly rotating wheel hub according to claim 1, characterized by The water inlet of the pure water unit (2) is connected with a tap water supply pipe (1).

3. The icing test apparatus for a large fast-rotating wheel hub according to claim 1, characterized by An electric stirrer is arranged in the pre-cooling water tank (3).

4. The icing test method for a large fast-rotating wheel hub according to Claim 1, characterized by A non-contact temperature sensor (14) is arranged on the back of the liquid nitrogen nozzle (12).

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