Vacuum desorption, impregnation and curing system, vacuum desorption device, and vacuum desorption process for protective layer of magnetic pole

Patent metadata

Field	Value
Publication number	US-12095318-B2
Application number	US-202117394976-A
Country	US
Kind code	B2
Filing date	Aug 5, 2021
Priority date	Oct 31, 2016
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

A vacuum desorption, impregnation and curing system, a vacuum desorption device and a vacuum desorption process for a protective layer of a magnetic pole are provided. Before injection of an impregnation liquid, vacuum desorption is performed on a sealed system formed by a magnetic yoke and a vacuum bag. A functional relationship about a vacuum degree or pressure in the sealed system is established so as to control the procedure of the vacuum desorption. Parameters in the functional relationship include an average suctioned gas volume flow of a vacuum pump, duration of vacuumization, an initial pressure in the sealed system, as well as an initial volume of the sealed system. With the functional relationship for the vacuum impregnation and curing system and the vacuum impregnation and curing process, a vacuum desorption standard is provided, a desorption time may be grasped better, and mutual verification effect is formed in conjunction with the detected pressure.

First claim

The invention claimed is:

1. A vacuum desorption device for a protective layer of a magnetic pole, wherein a magnetic yoke and a vacuum bag form a sealed system, and wherein the vacuum desorption device comprises:
a controller;
a vacuum pump configured to perform vacuum desorption on the sealed system, and
a heating device and/or an ultrasonic device,
wherein the controller is pre-stored with a functional relationship about a vacuum degree or pressure in the sealed system to control a procedure of the vacuum desorption, and parameters in the functional relationship comprise an average suctioned gas volume flow of the vacuum pump, duration of vacuumization, an initial pressure in the sealed system and an initial volume of the sealed system,
wherein the heating device and/or the ultrasonic device is configured to perform a heating desorption treatment on the sealed system, and the heating device is at least one of a microwave heating device, a far-infrared heat source and an electric heating film, the electric heating film is laid at a wall surface of the magnetic yoke, and a heat insulation layer is laid in addition to the electric heating film at the wall surface of the magnetic yoke,
a densimeter configured to detect an initial density and a current density, and
wherein an expansion procedure of gas suctioned out by vacuumization is a variable temperature procedure, and the parameters in the functional relation further comprise a polytropic index of a thermodynamic polytropic procedure.

2. The vacuum desorption device for the protective layer of the magnetic pole according to claim 1 , further comprising:
a temperature sensor which is configured to detect an initial temperature in the scaled system and a current temperature in the sealed system during vacuumization and to output the initial temperature and the current temperature to the controller, and
wherein an expansion procedure of gas suctioned out by vacuumization is a variable temperature procedure, and the parameters in the functional relationship further comprise the initial temperature and the current temperature of the sealed system.

3. The vacuum desorption device for the protective layer of the magnetic pole according to claim 1 , further comprising:
a pressure sensor which is configured to detect a current pressure in a procedure that the sealed system is vacuumized.

4. The vacuum desorption device for the protective layer of the magnetic pole according to claim 3 , wherein the parameters in the functional relationship pre-stored in the controller further comprise an altitude, the initial pressure in the sealed system is determined by the altitude and a standard atmospheric pressure at sea level, and the initial density is determined by an initial relative humidity, an initial temperature, the initial pressure and a partial pressure of water vapor in saturated wet air.

5. The vacuum desorption device for the protective layer of the magnetic pole according to claim 1 , wherein the vacuum pump is provided with a variable frequency governor to adjust the average suctioned gas volume flow of the vacuum pump.

6. The vacuum desorption device for the protective layer of the magnetic pole according to claim 1 , further comprising:
an air inlet filter which are in communication with the sealed system,
wherein the heating device comprises an air heater, and air enters the sealed system under an action of the vacuum pump after passing through the air heater and the air inlet filter.

7. The vacuum desorption device for the protective layer of the magnetic pole according to claim 6 , wherein an outlet air filter and/or a desorption process measurement device is provided between the sealed system and the vacuum pump, and the desorption process measurement device is configured to detect a content of water vapor in the air.

8. The vacuum desorption device for the protective layer of the magnetic pole according to claim 1 , wherein two ends of the magnetic yoke are provided with sealing and shielding thermal insulation covers to enclose a microwave from the microwave heating device.

9. The vacuum desorption device for the protective layer of the magnetic pole according to claim 1 , wherein the microwave heating device comprises a radiant heater for inputting a microwave, and an inside surface of the radiant heater facing the sealed system is provided with a water storage sponge.

10. A vacuum desorption, impregnation and curing system applied to a protective layer for a magnetic pole, having the vacuum desorption device according to claim 1 , comprising:
a pressing strip;
a magnet steel;
a magnetic yoke;
a vacuum bag mounted to the wall surface of the magnetic yoke, and the wall surface of the magnetic yoke form the sealed system.

11. The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to claim 10 , further comprising:
a system tank configured to load an impregnation liquid,
wherein a stirrer configured to stir the impregnation liquid is provided inside the system tank.

12. The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to claim 11 , wherein the system tank comprises a stirring tank and an output tank in communication with each other, the stirring tank is located upstream of the output tank, the stirrer is provided inside the stirring tank, and the output tank is further provided with an ultrasonic defoaming and vibrating bar.

13. The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to claim 12 , wherein the stirring tank is provided with a first air outlet, the output tank is provided with a second air outlet, the first air outlet is communicated with a vacuum pump, and the second air outlet is communicated with the vacuum pump or atmosphere.

14. The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to claim 11 , wherein a heating resistor is provided inside the stirrer to heat the impregnation liquid while stirring; the stirrer is driven by an electric motor, the electric motor is provided with a hollow shaft, and a bottom end of the hollow shaft is provided with a stirring blade of the stirrer; extension wires of a winding of the electric motor extend along the hollow shaft to the stirring blade and form an electrical circuit, the heating resistor is located at the stirring blade, and the extension wires are configured to supply electric power for the heating resistor.

15. The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to claim 10 , wherein the stirrer is driven by an electric motor, the electric motor is provided with a hollow shaft, and a bottom end of the hollow shaft is provided with a stirring blade of the stirrer; an ultrasonic high-frequency vibration emission head is further provided at a bottom of the hollow shaft.

16. The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to claim 10 , further comprising:
a microwave preheating device, which is provided between a system tank and the sealed system, for microwave heating of an impregnation liquid before the impregnation liquid is input to the sealed system, wherein the system tank is configured to load the impregnation liquid.

17. The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to claim 16 , wherein the mi

Assignees

• Beijing Goldwind Science & Creation Windpower Equipment Co Ltd

Inventors

• Ma Shengjun
• Ma Wanshun

Classifications

• H02K1/2788

  the rotor consisting of a single magnet or two or more axially juxtaposed single magnets · CPC title

• B29C70/16

  using fibres of substantial or continuous length {(non-woven fabrics per se D04H3/00)} · CPC title

• H02K15/03

  having permanent magnets · CPC title

• B29L2031/085

  Wind turbine blades · CPC title

• B29C70/70

  Completely encapsulating inserts {(B29C70/86 takes precedence)} · CPC title