CN114877928A

CN114877928A - Ice coating test device and method for large-scale fast rotating hub

Info

Publication number: CN114877928A
Application number: CN202210461580.9A
Authority: CN
Inventors: 陈建霖; 杜丽杰
Original assignee: Beijing Yi Sheng Tai He Technology Co ltd
Current assignee: Beijing Yi Sheng Tai He Technology Co ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-08-09

Abstract

The invention discloses an icing test device and method for a large-scale fast rotating hub, wherein the device comprises a pure water unit, a precooling water tank, an icing spray head, a liquid nitrogen tank, a liquid nitrogen spray head, an air compressor, an air pressure stabilizing tank and a hub; the water outlet pipeline of the pure water unit is connected with the water inlet of the precooling water tank; the air compressor is connected with the air inlet side of the gas pressure stabilizing tank, and the air outlet side of the gas pressure stabilizing tank is connected with an ice-coating spray head which is connected with a water outlet pipeline of the precooling water tank together; the ice-coating spray head is arranged on one side of the hub and is arranged towards the inner circumferential surface of the hub; the liquid nitrogen tank is respectively connected to the precooling water tank and the liquid nitrogen spray head; the liquid nitrogen showerhead is disposed at one side of the hub and is disposed toward an inner circumferential surface of the hub. The icing test device controls the icing state by adjusting the air pressure, the water pressure and the rotating speed of the hub, can accurately reduce the icing working conditions such as rime, mixed rime and the like in an open environment, and meets various test requirements.

Description

Ice coating test device and method for large-scale fast rotating hub

Technical Field

The invention 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

In winter, the temperature is low, and ice damage accidents caused by circuit icing, pavement icing, mechanical equipment icing and the like occur. The ice coating of the transmission line causes various accidents such as tripping, pole falling and line breaking, and comprehensive power failure, and the power supply safety is seriously influenced. The problem of runway ice accumulation appears in airport runway in cold season, after the runway freezes, forms thin ice layer earlier, then along with the expansion of ice sheet area, the runway can form the ice accumulation, and the runway coefficient of friction can descend sharply this moment, and the runway can be very smooth, will influence the normal take off and land of aircraft, leads to the fact casualties even. The road surface is coated with ice to cause the vehicle tire to skid, which causes traffic accidents. Mechanical equipment such as wind turbine blades and airplane parts are coated with ice, so that the performance of the equipment is seriously influenced, the operation efficiency is reduced, and even accidents are caused. Therefore, the method has important significance for the industries of traffic, electric power, energy and the like by researching the ice coating characteristics of the pavement or equipment, monitoring the formation of ice coating and eliminating ice coating disasters.

At present, the research methods for icing characteristics at home and abroad comprise a theoretical analysis method, a test device simulation method, a natural environment test method and the like, wherein the test device simulation method is used for establishing an icing simulation device, the icing condition is simulated manually, and the test result can be seen more intuitively. In the prior art, an icing test device is mostly arranged in a closed heat-preservation environment, and icing simulation is realized by using a refrigerating unit for refrigerating and spraying supercooled water by a spray head, but the icing simulation of a large-scale rapid rotation test piece in an open environment is less, and a related test device is lacked.

Disclosure of Invention

The invention aims to provide an ice coating test device and method for a large-scale fast rotating hub, which can accurately control test temperature and ice coating thickness by controlling air pressure, water pressure and hub rotating speed, and realize multiple ice coating working conditions such as rime, rime and mixed rime in an open environment.

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

the invention provides an icing test device for a large-scale fast rotating hub, which comprises a pure water unit, a precooling 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, wherein the pure water unit is connected with the precooling water tank;

the water outlet pipeline of the pure water unit is connected with the water inlet of the precooling water tank;

the air compressor is connected with the air inlet side of the gas pressure stabilizing tank, and the air outlet side of the gas pressure stabilizing tank is connected with the water outlet pipeline of the precooling water tank and is connected with the icing sprayer together;

the ice-coating nozzle is arranged on one side of the hub and is arranged towards the inner circumferential surface of the hub;

the liquid nitrogen tank is respectively connected to the precooling water tank and the liquid nitrogen spray head;

the liquid nitrogen showerhead is disposed at one side of the hub and is disposed toward an inner circumferential surface of the hub.

As an alternative of the invention, the water inlet of the water purification unit is connected with a tap water supply pipe.

As an alternative of the present invention, an electric stirrer is disposed in the pre-cooling water tank.

As an alternative scheme of the invention, a first electric regulating valve is arranged on a water outlet pipeline of the precooling water tank connected with the ice-coating spray head.

As an alternative of the present invention, the liquid nitrogen tank is connected to the pre-cooling water tank and the liquid nitrogen spray head through a pipeline and a three-way regulating valve, respectively.

As an alternative of the invention, a third electric control valve is arranged between the gas outlet side of the gas surge tank and the ice-coating nozzle.

As an alternative of the invention, the gas outlet side of the gas pressure stabilizing tank is further communicated with the water outlet pipeline of the pre-cooling water tank through a second electric regulating valve.

As an alternative of the present invention, a first end of the second electric control valve is connected to a pipeline between the gas outlet side of the gas surge tank and the third electric control valve, and a second end of the second electric control valve is connected to a water outlet pipeline of the pre-cooling water tank.

As an alternative of the invention, the back of the liquid nitrogen spray head is provided with a non-contact temperature sensor.

In a second aspect of the present invention, a testing method of the ice coating testing apparatus for a large-sized fast rotating hub is provided, which includes the following steps:

1) firstly, a motor of a hub (11) is turned on;

2) then, opening the water purification unit (2) to prepare pure water, and stopping when the water level rises to a preset position of the pre-cooling water tank (3);

3) opening the three-way regulating valve (5) to enable a part of liquid nitrogen to enter the precooling water tank (3) for precooling; when the temperature of water in the pre-cooling water tank (3) is 2-5 ℃, closing a valve of a three-way regulating valve (5) entering a pipeline of the pre-cooling water tank (3);

4) liquid nitrogen is directly sprayed towards the module on the inner surface of the hub (11) through a liquid nitrogen spray head (12);

5) when a non-contact temperature sensor (14) detects that the surface temperature of the module is about-25 ℃, an icing nozzle (13) is opened, the water flow and the air pressure are controlled by adjusting a first electric regulating valve (4) and a third electric regulating valve (10), the particle diameter of the nozzle is adjusted, and various icing states are formed on the inner surface of a hub (11);

6) after the experiment is completed, the first electric control valve (4), the third electric control valve (10) and the three-way control valve (5) are closed, the second electric control valve (9) is opened, and the pipeline purging is carried out.

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

1) the icing test device comprises a pure water unit, a precooling water tank, an icing spray head, a liquid nitrogen tank, a liquid nitrogen spray head, an air compressor, an air pressure stabilizing tank and a hub, wherein the icing state is controlled by adjusting air, water pressure and the rotating speed of the hub, so that icing working conditions such as rime, rime and mixed rime can be accurately restored in an open environment, and various test requirements are met.

2) In the icing test, the icing water source adopts pure water precooled to 2-5 ℃, so that the blockage of a spray head and a pipeline due to scaling is prevented, the condensation speed of water mist can be increased, and the icing time is effectively shortened.

3) According to the icing test device, the liquid nitrogen has the characteristics of low gasification temperature, high cooling efficiency, no toxicity, no harm and the like, the liquid nitrogen is used as a cold source, the safe and rapid cooling in an open environment can be realized, and the icing test is not easily influenced by the ambient temperature. Compared with the traditional refrigerating unit, the liquid nitrogen refrigerating system also has the advantages of low installation and operation cost, no enclosure structure is needed, and the installation and maintenance cost is greatly reduced.

4) According to the icing test device, the non-contact temperature sensor is arranged on the back side of the liquid nitrogen spray head, so that the influence of the liquid nitrogen gasification process on the temperature sensor is avoided, the system circuit can be simplified, and the wiring winding is avoided when the wheel hub rotates.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of an icing test apparatus according to an embodiment of the present invention.

FIG. 2 is a flow chart of a working method of the icing test device according to the embodiment of the invention.

Description of the symbols: 1-a tap water supply pipe; 2-a water purification unit; 3-precooling a water tank; 4-a first electropneumatic valve; 5-three-way regulating valve; 6-liquid nitrogen tank; 7-air compressor; 8-a gas surge tank; 9-a second electric control valve; 10-a third electric control valve; 11-a hub; 12-liquid nitrogen spray head; 13-an ice-coating nozzle; 14-non-contact temperature sensor.

Detailed Description

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.

As shown in fig. 1, in order to solve the problem of lack of a fast-rotating icing device in an open environment, in a first aspect of the embodiment of the present invention, an icing test device for a large fast-rotating hub is provided, which includes 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 hub 11.

The water outlet pipeline of the water purifier unit 2 is connected with the water inlet of the precooling water tank 3, and the water inlet of the water purifier unit 2 is connected with a tap water supply pipe 1; the water source of the water purifier set 2 is connected through a tap water pipe 1, purified by the water purifier set 2 until the conductivity is less than or equal to 10 mus/cm, and then sent into the precooling water tank 3.

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

The ice-coating head 13 is disposed at one side of the hub 11 and is disposed toward an inner circumferential surface of the hub 11; the back of the liquid nitrogen spray head 12 is provided with a non-contact temperature sensor 14, the temperature sensor 14 can detect the surface temperature of the hub, and meanwhile detected data are uploaded to a PLC system, so that closed-loop control of the whole system is achieved.

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

The liquid nitrogen showerhead 12 is provided at one side of the hub 11 and is disposed toward an inner circumferential surface of the hub 11. The liquid nitrogen spray head 12 sprays liquid nitrogen before the ice coating test is carried out, and the temperature of the module on the inner surface of the hub 11 is reduced to be less than or equal to minus 25 ℃. After the temperature of the modules on the inner surface of the hub 11 is reduced to be less than or equal to minus 25 ℃, the water flow, the water pressure and the air pressure are respectively adjusted through the first electric adjusting valve 4 and the second electric adjusting valve 10, the rotating speed of the hub 11 is changed to control the ice coating state, and various ice coating working conditions such as rime, rime and mixed rime can be realized in an open environment.

As an alternative of the invention, an electric stirrer is arranged in the pre-cooling water tank 3, and the pure water in the pre-cooling water tank can be uniformly pre-cooled to 2-5 ℃.

As an alternative of the present invention, the air outlet side of the gas pressure stabilizing tank 8 is further communicated with the water outlet pipeline of the pre-cooling water tank 3 through a second electric regulating valve 9. As an alternative of the present invention, a first end of the second electric control valve 9 is connected to a pipeline between the gas outlet side of the gas pressure stabilizing tank 8 and the third electric control valve 10, and a second end of the second electric control valve 9 is connected to a water outlet pipeline of the pre-cooling water tank 3.

As shown in fig. 2, according to a second aspect of the embodiment of the present invention, there is provided a testing method of the ice coating testing apparatus for a large-sized fast rotating hub, including the following steps:

s1: firstly, a motor of the hub 11 is started to be in a rotating state of about 30-60 r/min.

S2: and then the pure water unit 2 is opened to prepare pure water, and the operation is stopped when the water level rises to the high position of the preset position of the pre-cooling water tank 3.

S3: opening the three-way regulating valve 5 to enable a part of liquid nitrogen to enter the precooling water tank 3 for precooling; and when the temperature of the water in the pre-cooling water tank 3 is 2-5 ℃, closing the valve of the three-way regulating valve 5, which enters the pipeline of the pre-cooling water tank 3.

S4: and a low-temperature liquid nitrogen medium is adopted, and liquid nitrogen is directly sprayed to the module on the inner surface of the hub 11 through a liquid nitrogen spray head 12 so as to reduce the temperature of the module.

S5: adopt 14 detection module surface temperature of non-contact temperature sensor, the temperature that the sensor detected can upload to the PLC system, when module surface temperature was about-25 ℃, opens icing shower nozzle 13, controls discharge, atmospheric pressure through adjusting first electrical control valve 4 and third electrical control valve 10, adjusts shower nozzle particle diameter, forms many icing states such as rime, mix rime in the short time at wheel hub 11 internal surface.

As an example of the step, the working condition of rime ice coating can be quickly realized by adjusting the water flow rate to be 60 +/-20L/(h.m 2), the median volume diameter of water drops to be 25 mu m and the liquid water content in the air to be 0.8g/m 3.

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, the second electric regulating valve 9 is opened, and the pipeline purging is carried out.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.

Claims

1. An icing test device for a large-sized fast rotating hub is characterized by comprising a pure water unit (2), a precooling water tank (3), an icing spray head (13), a liquid nitrogen tank (6), a liquid nitrogen spray head (12), an air compressor (7), a gas surge tank (8) and a hub (11);

the water outlet pipeline of the pure water unit (2) is connected with the water inlet of the precooling water tank (3);

the air compressor (7) is connected with the air inlet side of the gas pressure stabilizing tank (8), and the air outlet side of the gas pressure stabilizing tank (8) is connected with the water outlet pipeline of the pre-cooling water tank (3) and is commonly connected with the ice-coating spray head (13);

the ice-coating nozzle (13) is arranged at one side of the hub (11) and is arranged towards the inner circumferential surface of the hub (11);

the liquid nitrogen tank (6) is respectively connected to the pre-cooling water tank (3) and the liquid nitrogen spray head (12);

the liquid nitrogen showerhead (12) is provided on one side of the hub (11) and is disposed toward an inner peripheral surface of the hub (11).

2. The icing test device for the large-scale fast rotating hub according to claim 1, wherein a tap water supply pipe (1) is connected to a water inlet of the water purification unit (2).

3. The icing test device for the large-scale fast rotating hub according to claim 1, wherein an electric stirrer is arranged in the pre-cooling water tank (3).

4. The icing test device for the large-scale fast rotating hub according to claim 1, wherein a first electric control valve (4) is arranged on a water outlet pipeline of the pre-cooling water tank (3) connected with the icing nozzle (13).

5. The icing test device for the large-scale fast rotating hub according to claim 1, wherein the liquid nitrogen tank (6) is connected to the pre-cooling water tank (3) and the liquid nitrogen spray head (12) through a pipeline and a three-way regulating valve (5), respectively.

6. The icing test device for the large-scale fast rotating hub according to claim 1, characterized in that a third electric control valve (10) is arranged between the air outlet side of the gas surge tank (8) and the icing nozzle (13).

7. The icing test device for the large-scale fast rotating hub according to claim 6, wherein the air outlet side of the gas surge tank (8) is further communicated with the water outlet pipeline of the pre-cooling water tank (3) through a second electric regulating valve (9).

8. The icing test device for the large-scale fast rotating hub according to claim 7, wherein a first end of the second electric control valve (9) is connected to a pipeline between an air outlet side of the gas surge tank (8) and a third electric control valve (10), and a second end of the second electric control valve (9) is connected to an outlet pipeline of the pre-cooling water tank (3).

9. The icing test device for the large-scale fast rotating hub according to claim 1, wherein a non-contact temperature sensor (14) is arranged on the back surface of the liquid nitrogen spray nozzle (12).

10. A test method of the icing test device of the large-scale fast rotating hub according to any one of claims 1 to 9 is characterized by comprising the following steps:

1) firstly, a motor of a hub (11) is turned on;