Magnetic gathering ring of nuclear-grade electromagnetic valve and manufacturing method of magnetic gathering ring

Abstract

The invention discloses a magnetism gathering ring of a nuclear-grade electromagnetic valve and a manufacturing method thereof, and is characterized in that the magnetism gathering ring is composed of magnetism isolating rings arranged on two sides of a coil framework, and a magnetism isolating cylinder is further arranged between the magnetism isolating rings. Through the arrangement of the magnetic gathering ring, the effect of gathering magnetic induction lines is achieved, when the electromagnetic coil is powered on to generate a magnetic field, the magnetic induction lines in the magnetic field are gathered through the magnetic gathering ring, so that the magnetic induction lines passing through the static iron core and the movable iron core in a unit space are increased, and the electromagnetic force borne by the static iron core and the movable iron core is increased; the electromagnetic force is effectively increased to ensure that the electromagnetic valve can work normally; the radiation-resistant coating is formed by coating the surface of the magnetic isolation ring with the radiation-resistant coating, so that the electromagnetic valve has good high temperature resistance, high-dose radiation resistance and shock resistance when used in the nuclear field, and the service life of the electromagnetic valve is prolonged; and meanwhile, the radiation-resistant coating is smeared on the surface of the magnetic isolation ring, so that the magnetic isolation ring can be protected from being influenced by corrosion caused by complex environmental conditions in the nuclear field.

Description

Technical Field

[0001] The invention relates to a magnetic concentrating ring for a nuclear-grade solenoid valve, and in particular to a magnetic concentrating ring for a nuclear-grade solenoid valve and a manufacturing method thereof. Background Art

[0002] Nuclear-grade solenoid valves are fluid control devices that control the opening or closing of valves by controlling the power supply of the electromagnet coil. Since solenoid valves are used in the nuclear field for a long time, the requirements for solenoid valves are very high. They must be resistant to high-dose radiation, radiation, high temperature, and shock. Otherwise, the solenoid valves will be affected by nuclear radiation, resulting in a short service life and need to be replaced frequently. Moreover, the stable performance of solenoid valves is an important guarantee for the safe operation of nuclear power plant units. Nuclear-grade solenoid valves are key interlocking control equipment for the safe operation of nuclear power plants. If the performance is unstable, malfunctions or refusal to operate, or even delayed reactions occur, it may cause an unexpected shutdown of the power plant. The electromagnetic coil in the nuclear-grade solenoid valve has a specific power consumption requirement. Under this power consumption requirement, there is a requirement limit on the current of the electromagnetic coil, and the electromagnetic force decreases as the current decreases. Once the electromagnetic force is too small, it will not attract the iron core and the electromagnetic valve will not work normally. Once the electromagnetic valve fails to work normally during use, it will affect the normal operation of the entire nuclear power unit. To this end, a magnetic field ring of a nuclear-grade solenoid valve and a manufacturing method thereof are proposed. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and to provide a magnetic field focusing ring of a nuclear-grade solenoid valve and a manufacturing method thereof.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a magnetic focusing ring for a nuclear-grade solenoid valve, characterized in that the magnetic focusing ring is composed of magnetic isolation rings installed on both sides of the coil frame, and a magnetic isolation cylinder is installed between the magnetic isolation rings; the magnetic isolation rings are coated with a radiation-resistant coating.

[0005] Further preferably, the magnetic isolation ring is clamped on the coil frame and there is a gap between the surface of the magnetic isolation ring and the shell of the solenoid valve.

[0006] Further preferably, the radiation-resistant coating is made by mixing and blending one or more of epoxy resin, red stone titanium dioxide, potassium titanate, silicon nitride powder, expanded vermiculite powder, mica powder, talcum powder, zeolite powder, solvent, isocyanate curing agent, and ethylene glycol ethyl ether acetate.

[0007] A method for manufacturing a magnetic field focusing ring of a nuclear-grade solenoid valve, characterized in that the manufacturing method is as follows: Step 1: Make the magnetic isolation ring through stamping die and sheet metal bending process; Step 2: Prepare the radiation-resistant coating according to the set ratio; Step 3: Evenly apply the radiation-resistant coating on the magnetic isolation ring to form a radiation-resistant coating; Step 4: Place the magnetic isolation ring coated with the radiation-resistant coating in an oven and bake at 95-105°C for 1-1.5 hours; Step 5: After the initial drying, heat to 155-165℃ and bake for 3-3.5h; Step 6: After drying, wait for natural cooling, and then assembly can be carried out.

[0008] Further preferably, the dosage ratio of each component when the radiation-resistant coating is mixed is: 40% epoxy resin, 8-12% red stone titanium dioxide, 6-8% potassium titanate, 4-6% silicon nitride powder, 4-6% expanded vermiculite powder, 3-5% zeolite powder, 4-7% mica powder, 4-7% talc, 10-15% solvent, 15-25% isocyanate curing agent, and 15-25% ethylene glycol ethyl ether acetate.

[0009] Further preferably, the dosage ratio of each component when the radiation-resistant coating is mixed is: 8-12% red titanium dioxide, 6-8% potassium titanate, 4-6% silicon nitride powder, 4-6% expanded vermiculite powder, 3-5% zeolite powder, 4-7% mica powder, 4-7% talc powder, 10-15% solvent, 15-25% isocyanate curing agent, and 15-25% ethylene glycol ethyl ether acetate.

[0010] The beneficial effects of the present invention are as follows: the magnetic flux lines are gathered by setting the magnetic flux ring. When the electromagnetic coil is energized, a magnetic field is generated. The magnetic flux lines in the magnetic field are gathered by the magnetic flux ring, so that the magnetic flux lines passing through the static iron core and the moving iron core in a unit space are increased, so that the electromagnetic force on the static iron core and the moving iron core is increased, and the electromagnetic force is effectively increased to ensure that the electromagnetic valve can work normally. By applying radiation-resistant coating on the surface of the magnetic isolation ring to form a radiation-resistant coating, the solenoid valve has good high temperature resistance, flame retardancy, resistance to high-dose radiation and shock resistance when used in the nuclear field, thereby improving the service life of the solenoid valve. At the same time, applying radiation-resistant coating on the surface of the magnetic isolation ring can protect the magnetic isolation ring from corrosion caused by the complex environmental conditions in the nuclear field. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram when the present invention is used.

[0012] Legend: 4, coil frame; 5, magnetic focusing ring; 51, magnetic isolation ring; 52, magnetic isolation cylinder. DETAILED DESCRIPTION

[0013] Hereinafter, we will further explain the magnetic field focusing ring of a nuclear-grade solenoid valve and its manufacturing method described in the present invention in conjunction with the accompanying drawings.

[0014] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0015] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense; for example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] See also Figure 1-Figure 2 As shown in the figure, a magnetic focusing ring of a nuclear-grade electromagnetic valve is characterized in that the magnetic focusing ring 5 is composed of magnetic isolation rings 51 installed on both sides of the coil skeleton, and a magnetic isolation cylinder 52 is also installed between the magnetic isolation rings 51 and the magnetic isolation rings 51; The arrangement of the magnetic focusing ring 5 can gather the magnetic flux lines. When the electromagnetic coil 41 is energized, a magnetic field is generated. The magnetic flux lines in the magnetic field are gathered by the magnetic focusing ring 5, so that the magnetic flux lines passing through the static iron core and the moving iron core in a unit space are increased, and the electromagnetic force on the static iron core and the moving iron core is increased, thereby effectively increasing the electromagnetic force to ensure that the solenoid valve can work normally.

[0017] In one embodiment, the magnetic isolation ring 51 is stuck on the coil skeleton 4 and there is a gap between the surface of the magnetic isolation ring 51 and the shell of the solenoid valve; by setting the gap, the surface of the magnetic focusing ring 5 and the shell of the solenoid valve are kept within a certain range without direct contact, avoiding the dispersion of magnetic flux lines due to contact, thereby improving the magnetic focusing effect.

[0018] In one embodiment, the magnetic isolation ring 51 is coated with a radiation-resistant coating, and the radiation-resistant coating is made by mixing and blending one or more of epoxy resin, red stone titanium dioxide, potassium titanate, silicon nitride powder, expanded vermiculite powder, mica powder, talcum powder, zeolite powder, solvent, isocyanate curing agent, and ethylene glycol ethyl ether acetate; Among them, the role of red stone titanium dioxide is to provide excellent weather resistance in the coating, with good water resistance and corrosion resistance; potassium titanate is to enhance mechanical properties, improve thermal insulation and enhance corrosion resistance; silicon nitride powder is used to improve high temperature resistance and wear resistance, and at the same time has high density, low expansion coefficient and high thermal conductivity, so that the coating is not easy to crack at high temperature; expanded vermiculite powder increases high temperature resistance and fire resistance, and at the same time increases the viscosity of the coating, thereby improving the stability of the coating; mica powder is used to improve the coating's wear resistance, insulation, flame retardancy, UV resistance and thermal radiation performance; talcum powder can be used to improve the coating's paint film hardness, durability and wear resistance; zeolite powder is to improve fire retardancy and high temperature resistance.

[0019] By applying radiation-resistant paint on the surface of the magnetic isolation ring 51 to form a radiation-resistant coating, the solenoid valve has good high temperature resistance, flame retardancy, resistance to high-dose radiation and shock resistance when used in the nuclear field, thereby improving the service life of the solenoid valve. At the same time, applying radiation-resistant paint on the surface of the magnetic isolation ring 51 can protect the magnetic isolation ring 51 from corrosion caused by the complex environmental conditions in the nuclear field.

[0020] The total amount of the following formulation ratios in radiation-resistant coatings includes but is not limited to 100%; Example 1

[0021] The manufacturing method of the magnetic focusing ring in the present invention is as follows: The first step: manufacturing the magnetic isolation ring 51 by using a stamping die and a sheet metal bending process; Step 2: Prepare the radiation-resistant coating according to the set ratio: epoxy resin or red stone titanium dioxide or potassium titanate or silicon nitride powder or expanded vermiculite powder or zeolite powder or mica powder or talcum powder; Step 3: evenly apply the prepared radiation-resistant coating on the magnetic isolation ring 51 to form a radiation-resistant coating; Step 4: Place the magnetic isolation ring 51 coated with the radiation-resistant coating in an oven and bake at 95-105° C. for 1-1.5 hours; Step 5: After the initial drying, heat to 155-165℃ and bake for 3-3.5h; Step 6: After drying, wait for natural cooling, and then assembly can be carried out. Example 2

[0022] The difference between this embodiment and embodiment 1 is that the proportions of the radiation-resistant coating in this embodiment are: 40% epoxy resin, 12% red stone titanium dioxide, 8% potassium titanate, 6% silicon nitride powder, 6% expanded vermiculite powder, 5% zeolite powder, 7% mica powder, 7% talc powder, 15% solvent, 25% isocyanate curing agent, and 25% ethylene glycol ethyl ether acetate. Example 3

[0023] The difference between this embodiment and Embodiment 1 and Embodiment 2 is that the proportions of the radiation-resistant coating in this embodiment are: 12% red titanium dioxide, 8% potassium titanate, 6% silicon nitride powder, 6% expanded vermiculite powder, 5% zeolite powder, 7% mica powder, 7% talc powder, 15% solvent, 25% isocyanate curing agent, and 25% ethylene glycol ethyl ether acetate.

[0024] The protection scope of the present invention is not limited to the above embodiments and their variations. Conventional modifications and replacements made by those skilled in the art based on the contents of this embodiment all fall within the protection scope of the present invention.

Claims

1. A magnetic field focusing ring for a nuclear-grade solenoid valve, characterized in that The magnetic focusing ring is composed of magnetic isolation rings installed on both sides of the coil frame, and magnetic isolation cylinders are installed between the magnetic isolation rings. The magnetic isolation rings are coated with radiation-resistant coatings.

2. The magnetic concentrator of a nuclear-grade solenoid valve according to claim 1, characterized in that: The magnetic isolation ring is clamped on the coil frame and there is a gap between the surface of the magnetic isolation ring and the shell of the electromagnetic valve.

3. The magnetic concentrator of a nuclear-grade solenoid valve according to claim 1, characterized in that: The radiation-resistant coating is prepared by mixing and blending one or more of epoxy resin, red stone titanium dioxide, potassium titanate, silicon nitride powder, expanded vermiculite powder, mica powder, talcum powder, zeolite powder, solvent, isocyanate curing agent and ethylene glycol ethyl ether acetate.

4. The method for manufacturing a magnetic concentrator ring of a nuclear-grade solenoid valve according to any one of claims 1 to 3, characterized in that: The production method is as follows: Step 1: Make the magnetic isolation ring through stamping die and sheet metal bending process; Step 2: Prepare the radiation-resistant coating according to the set ratio; Step 3: Evenly apply the radiation-resistant coating on the magnetic isolation ring to form a radiation-resistant coating; Step 4: Place the magnetic isolation ring coated with the radiation-resistant coating in an oven and bake at 95-105°C for 1-1.5 hours; Step 5: After the initial drying, heat to 155-165℃ and bake for 3-3.5h; Step 6: After drying, wait for natural cooling, and then assembly can be carried out.

5. The method for manufacturing a magnetic field focusing ring of a nuclear-grade electromagnetic valve as described in claim 3 is characterized in that: The dosage ratio of each component when the radiation-resistant coating is mixed is: 40% epoxy resin, 8-12% red stone titanium dioxide, 6-8% potassium titanate, 4-6% silicon nitride powder, 4-6% expanded vermiculite powder, 3-5% zeolite powder, 4-7% mica powder, 4-7% talc, 10-15% solvent, 15-25% isocyanate curing agent, and 15-25% ethylene glycol ethyl ether acetate.

6. The method for manufacturing a magnetic field focusing ring of a nuclear-grade electromagnetic valve as described in claim 3, characterized in that: The dosage ratio of each component when mixing the radiation-resistant coating is: 8-12% red titanium dioxide, 6-8% potassium titanate, 4-6% silicon nitride powder, 4-6% expanded vermiculite powder, 3-5% zeolite powder, 4-7% mica powder, 4-7% talc powder, 10-15% solvent, 15-25% isocyanate curing agent, and 15-25% ethylene glycol ethyl ether acetate.

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