Primary helium fan stator outgoing line structure and manufacturing method thereof

Abstract

The invention belongs to the technical field of primary helium fans, and particularly relates to a primary helium fan stator outgoing line structure and a manufacturing method thereof. According to the technical scheme, the main helium fan stator outgoing line structure comprises a machine base, a stator iron core is installed in the machine base, the stator iron core comprises a stator punching sheet, a stator pressing ring and a stator coil, and the stator coil penetrates through the stator punching sheet and the stator pressing ring; a wire outlet box is fixed on the base, and a plurality of stator coils are connected and then led out to the wire outlet box by stator outgoing wires; the stator leading-out wire is composed of a plurality of strands of thin wires, and the outer circle of each strand of thin wire is not wrapped by an insulating material. The invention provides a primary helium fan stator leading-out wire structure capable of satisfying cable leading-out in a narrow space of a primary helium fan and a manufacturing method thereof.

Description

Technical Field

[0001] The invention belongs to the technical field of main helium blowers, and particularly relates to a stator lead-out wire structure of a main helium blower and a manufacturing method thereof. Background Art

[0002] In a high-temperature gas-cooled reactor nuclear power plant, the main helium blower drives the helium coolant in the primary loop to circulate. The main helium blower is a single-stage vertical centrifugal compressor, with the motor and the impeller coaxial and installed above in the steam generator pressure vessel. Since electrical components cannot withstand high temperatures, the overall structure of the main helium blower includes two parts: a blower cavity and a motor cavity. Mechanical components such as impellers and diffusers are arranged in the blower cavity and are in direct contact with helium at 250°C and 7 MPa. The motor cavity mainly houses electrical components such as the motor, and the helium gas in the cavity is at 7 MPa and 65°C. This part of the helium gas is driven by the auxiliary impeller of the main helium blower drive motor and circulates in the motor cavity. Since the motor cavity is connected to the primary loop, this part of the helium gas has a certain radioactivity.

[0003] The designed service life of the main helium blower is 60 years, and the irradiation requirement is 525 kGy. Conventional silicone rubber cables will become hard and brittle in a long-term irradiation environment, affecting the insulation effect and unable to meet the requirements of radiation resistance and service life. Using low-smoke, halogen-free, flame-retardant cables inside the nuclear power plant containment can meet the requirements of service life and irradiation, but this cable is relatively hard and has too large a bending radius, unable to meet the requirements for cable lead-out in the narrow space of the main helium blower. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a stator lead-out wire structure of a main helium blower and a manufacturing method thereof that can meet the requirements for cable lead-out in the narrow space of the main helium blower.

[0005] The technical solution adopted by the present invention is as follows:

[0006] The stator lead-out wire structure of the main helium blower includes a machine base, a stator core is installed in the machine base, the stator core includes stator punching sheets, a stator retaining ring and a stator coil, and the stator coil passes through the stator punching sheets and the stator retaining ring; an outlet box is fixed on the machine base, and after several stator coils are connected, they are led out to the outlet box by stator lead-out wires; the stator lead-out wires are composed of multiple thin wires, and the outer circle of each thin wire is not wrapped with insulating material.

[0007] The stator lead-out wires of the present invention are composed of multiple thin wires, and the outer circle of each thin wire is not wrapped with insulating material, and can be bent with a relatively small bending radius. When the stator lead-out wires converge in the circumferential direction of the stator retaining ring at a specified position, they can meet the requirements for cable lead-out in the narrow space of the main helium blower. The present invention has the characteristics of simple structure, safety and reliability, low cost, strong feasibility, etc.

[0008] As a preferred embodiment of the present invention, a number of end hoop brackets are fixed on the stator retaining ring. Circular slots conforming to the stator lead wires are formed on the end hoop brackets. The stator lead wires pass through the circular slots of some end hoop brackets in sequence and then are led out to the outlet box. The end hoop brackets guide the stator lead wires to ensure that the stator lead wires are bent with a small radius and led out to the outlet box along a narrow space.

[0009] As a preferred embodiment of the present invention, a shunt ring is connected to the neutral point of the stator coil. Rectangular slots conforming to the shunt ring are arranged on the end hoop brackets. The shunt ring passes through the rectangular slots of a number of end hoop brackets in sequence. The shunt ring is a rectangular ring-shaped conductive material.

[0010] As a preferred embodiment of the present invention, the stator lead wire is a silicone rubber-insulated motor lead wire with the silicone part removed. The stator lead wire of the present invention adopts a silicone rubber-insulated motor lead wire with the silicone part removed, which can not only meet the requirements of radiation resistance and service life, but also meet the requirements of cable lead-out in the narrow space of the main helium blower.

[0011] As a preferred embodiment of the present invention, the stator lead wire includes a lead joint, an arc lead, a bent lead and a lead end arranged in sequence. The lead joint is connected to the stator coil, and the lead end is led out to the outlet box.

[0012] As a preferred embodiment of the present invention, after the stator lead wire is welded to the stator coil, the lead joint is wrapped with glass low-binder mica tape; the lead joint and the arc lead are then successively half-lapped with an alkali-free glass fiber insulation binding tape, an epoxy glass low-binder mica tape, and an alkali-free glass fiber tape; the bent lead is wrapped with a polyester film tape and then coated with Ronax silicone sealant glass glue. The arc lead of the main insulation part does not exceed the outer circle of the stator retaining ring.

[0013] As a preferred embodiment of the present invention, the stator core, the lead joint and the arc lead are vacuum pressure impregnated with varnish. When the stator core is vacuum pressure impregnated with varnish, the varnish liquid level needs to be controlled so that it submerges all the stator coils and the lead ends and the bent leads of the parts not wrapped with the main insulation are not impregnated with varnish.

[0014] As a preferred embodiment of the present invention, after the stator core is hot-fitted onto the machine base, the polyester film tape on the bent lead is removed, and then an alkali-free glass fiber insulation binding tape is wrapped on the bent lead, an oxygen glass low-binder mica tape is wrapped while brushing VPI varnish, and then an alkali-free glass fiber insulation binding tape is wrapped.

[0015] A manufacturing method for the structure of the stator lead wire of a main helium blower includes the following steps:

[0016] S1: After the stator lead wire is welded to the stator coil, the lead connector is wrapped with glass-reinforced mica foil; the lead connector and the curved lead are then half-wrapped with alkali-free glass fiber insulation binding tape, epoxy glass-reinforced mica tape, and alkali-free glass fiber tape in sequence; the bent lead is wrapped with polyester film tape, and then coated with Ronastar silicone sealant glass glue;

[0017] S2: Vacuum pressure dip varnishing of stator core, lead connector and arc lead;

[0018] S3: After the stator core is heat-fitted onto the base, the polyester film tape on the bent lead is removed, and then the bent lead is wrapped with alkali-free glass fiber insulation tape, and then the edge is painted with VPI paint and wrapped with oxygen glass low-glue mica tape, and then wrapped with alkali-free glass fiber insulation tape;

[0019] S4: Test-assemble the outlet box, bend and fix the bent leads;

[0020] S5: The stator core is baked and cured as a whole, with the curing temperature not less than 155°C and the curing time not less than 15h.

[0021] As a preferred solution of the present invention, the stator lead wire is a silicone rubber insulated motor lead wire with the silicone part removed.

[0022] The beneficial effects of the present invention are:

[0023] The stator lead wire of the present invention is composed of multiple strands of fine wires, the outer circle of each strand of fine wire is not wrapped with insulating material, and can be bent to a small bending radius. When the stator lead wire is gathered at a specified position in the circumferential direction of the stator pressure ring, it can meet the requirements of cable lead-out in a narrow space of the main helium blower. The present invention has the characteristics of simple structure, safety and reliability, low cost, strong feasibility, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a right side view of the present invention.

[0026] In the figure: 1- stator punching sheet; 2- stator pressure ring; 3- stator coil; 4- stator lead wire; 5- parallel ring; 6- end clamp bracket; 7- machine base; 8- terminal box; 100- stator core; 401- lead connector; 402- arc lead; 403- bent lead; 404- lead terminal. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0029] As Figure 1 and Figure 2 shown, the main helium blower stator lead-out wire structure of this embodiment includes a machine base 7. A stator core 100 is installed inside the machine base 7. The stator core 100 includes stator punching sheets 1, a stator retaining ring 2, and a stator coil 3. The stator coil 3 passes through the stator punching sheets 1 and the stator retaining ring 2. An outlet box 8 is fixed on the machine base 7. After several stator coils 3 are connected, they are led out to the outlet box 8 by a stator lead-out wire 4. The stator lead-out wire 4 is composed of multiple thin wires, and the outer circle of each thin wire is not wrapped with insulating material.

[0030] The stator lead-out wire 4 of the present invention is composed of multiple thin wires, and the outer circle of each thin wire is not wrapped with insulating material, and it can be bent with a relatively small bending radius. When the stator lead-out wire 4 converges in the circumferential direction of the stator retaining ring 2 at a specified position, it can meet the requirements for cable lead-out in the narrow space of the main helium blower. The present invention has the characteristics of simple structure, safety and reliability, low cost, and strong feasibility.

[0031] Among them, several end hoop brackets 6 are fixed on the stator retaining ring 2. Circular slots conforming to the stator lead-out wire 4 are opened on the end hoop brackets 6. The stator lead-out wire 4 passes through the circular slots of some end hoop brackets 6 in sequence and then is led out to the outlet box 8. The end hoop brackets 6 guide the stator lead-out wire 4 to ensure that the stator lead-out wire 4 is bent with a small radius and led out to the outlet box 8 along the narrow space.

[0032] The neutral point of the stator coil 3 is connected with a parallel ring 5. Rectangular slots conforming to the parallel ring 5 are provided on the end hoop brackets 6. The parallel ring 5 passes through the rectangular slots of several end hoop brackets 6 in sequence. The parallel ring 5 is a rectangular ring-shaped conductive material.

[0033] In this embodiment, the stator lead wire 4 is a silicone rubber insulated motor lead wire with the silicone part removed. The stator lead wire 4 of the present invention adopts a silicone rubber insulated motor lead wire with the silicone part removed, which can not only meet the requirements of radiation resistance and service life, but also meet the requirements of cable lead-out in the narrow space of the main helium blower.

[0034] Specifically, the stator lead wire 4 includes a lead wire joint 401, an arc lead wire 402, a bent lead wire 403, and a lead wire end 404 arranged in sequence. The lead wire joint 401 is connected to the stator coil 3, and the lead wire end 404 is led out to the outlet box 8.

[0035] After the stator lead wire 4 is welded to the stator coil 3, the lead wire joint 401 is wrapped with glassless mica paper with less glue; the lead wire joint 401 and the arc lead wire 402 are then successively half-lapped with an alkali-free glass fiber insulation binding tape, an epoxy glassless mica tape with less glue, and an alkali-free glass fiber tape; the bent lead wire 403 is wrapped with a polyester film tape and then coated with Rohmax silicone sealant glass glue. The arc lead wire 402 of the main insulation part does not exceed the outer circle of the stator retaining ring 2.

[0036] The stator core 100, the lead wire joint 401, and the arc lead wire 402 are vacuum-pressure impregnated with varnish. When the stator core 100 is vacuum-pressure impregnated with varnish, it is necessary to control the varnish liquid level so that it immerses all the stator coils 3 and the lead wire end 404 and the bent lead wire 403 of the non-main-insulated part are not impregnated with varnish.

[0037] After the stator core 100 is hot-fitted onto the machine base 7, the polyester film tape on the bent lead wire 403 is removed, and then an alkali-free glass fiber insulation binding tape is wrapped on the bent lead wire 403, followed by brushing VPI varnish and wrapping an oxygen glassless mica tape with less glue, and then wrapping an alkali-free glass fiber insulation binding tape again.

[0038] A manufacturing method for the stator lead wire structure of the main helium blower includes the following steps:

[0039] S1: After the stator lead wire 4 is welded to the stator coil 3, the lead wire joint 401 is wrapped with glassless mica paper with less glue; the lead wire joint 401 and the arc lead wire 402 are then successively half-lapped with an alkali-free glass fiber insulation binding tape, an epoxy glassless mica tape with less glue, and an alkali-free glass fiber tape; the bent lead wire 403 is wrapped with a polyester film tape and then coated with Rohmax silicone sealant glass glue;

[0040] S2: The stator core 100, the lead wire joint 401, and the arc lead wire 402 are vacuum-pressure impregnated with varnish;

[0041] S3: After the stator core 100 is hot-fitted onto the machine base 7, the polyester film tape on the bent lead wire 403 is removed, and then an alkali-free glass fiber insulation binding tape is wrapped on the bent lead wire 403, followed by brushing VPI varnish and wrapping an oxygen glassless mica tape with less glue, and then wrapping an alkali-free glass fiber insulation binding tape again;

[0042] S4: Try to install the outgoing line box 8, bend and fix the bent lead 403;

[0043] S5: Bake and solidify the stator core 100 as a whole. The solidification temperature is not less than 155 °C and the solidification time is not less than 15 h.

[0044] The present invention is not limited to the above optional embodiments. Any person can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present invention, they all fall within the protection scope of the present invention.

Claims

1. The main helium blower stator lead wire structure is characterized by: The invention comprises a machine base (7), wherein a stator core (100) is installed in the machine base (7), wherein the stator core (100) comprises a stator punching sheet (1), a stator pressing ring (2) and a stator coil (3), wherein the stator coil (3) passes through the stator punching sheet (1) and the stator pressing ring (2); an outlet box (8) is fixed on the machine base (7), and after a plurality of stator coils (3) are connected, they are led out to the outlet box (8) by a stator lead wire (4); the stator lead wire (4) is composed of a plurality of thin wires, and the outer circle of each thin wire is not wrapped with insulating material.

2. The main helium blower stator lead wire structure according to claim 1, characterized in that: A plurality of end hoop brackets (6) are fixed on the stator pressure ring (2), and circular slots conforming to the shape of the stator lead wires (4) are formed on the end hoop brackets (6). The stator lead wires (4) are led out to the outlet box (8) after passing through the circular slots of some of the end hoop brackets (6) in sequence.

3. The main helium blower stator lead wire structure according to claim 2, characterized in that: The neutral point of the stator coil (3) is connected to a parallel ring (5), and a rectangular slot conforming to the parallel ring (5) is arranged on the end hoop bracket (6). The parallel ring (5) is sequentially penetrated by a plurality of rectangular slots of the end hoop bracket (6), and the parallel ring (5) is a rectangular annular conductive material.

4. The main helium blower stator lead wire structure according to claim 1, characterized in that: The stator lead wire (4) is a silicone rubber insulated motor lead wire with the silicone rubber part removed.

5. The main helium blower stator lead wire structure according to claim 1, characterized in that: The stator lead wire (4) comprises a lead wire connector (401), an arc lead wire (402), a bent lead wire (403) and a lead wire end (404) which are arranged in sequence; the lead wire connector (401) is connected to the stator coil (3), and the lead wire end (404) is led out to an outlet box (8).

6. The main helium blower stator lead wire structure according to claim 5, characterized in that: After the stator lead wire (4) is welded to the stator coil (3), the lead connector (401) is wrapped with glass-reinforced mica foil; the lead connector (401) and the curved lead wire (402) are then half-wrapped with alkali-free glass fiber insulation binding tape, epoxy glass-reinforced mica tape, and alkali-free glass fiber tape in sequence; the bent lead wire (403) is wrapped with a polyester film tape and then coated with Ronastar silicone sealant glass glue.

7. The main helium blower stator lead wire structure according to claim 6, characterized in that: The stator core (100), the lead connector (401) and the arc lead (402) are vacuum pressure dipped in varnish.

8. The main helium blower stator lead wire structure according to claim 7, characterized in that: After the stator core (100) is heat-shrink-fitted onto the machine base (7), the polyester film tape on the bent lead (403) is removed, and then the bent lead (403) is wrapped with an alkali-free glass fiber insulation binding tape, and then wrapped with an oxygen glass low-glue mica tape with VPI paint, and then wrapped with an alkali-free glass fiber insulation binding tape.

9. A method for manufacturing a main helium blower stator lead wire structure, using the main helium blower stator lead wire structure according to any one of claim 5, characterized in that: The following steps are involved: S1: After the stator lead wire (4) and the stator coil (3) are welded, the lead connector (401) is wrapped with glass-reinforced mica foil; the lead connector (401) and the curved lead wire (402) are then half-wrapped with alkali-free glass fiber insulation binding tape, epoxy glass-reinforced mica tape, and alkali-free glass fiber tape in sequence; the bent lead wire (403) is wrapped with a polyester film tape, and then coated with Ronastar silicone sealant glass glue; S2: Vacuum pressure dip varnishing of the stator core (100), the lead connector (401) and the arc lead (402); S3: After the stator core (100) is heat-fitted onto the machine base (7), the polyester film tape on the bent lead (403) is removed, and then the bent lead (403) is wrapped with an alkali-free glass fiber insulation binding tape, and then the edge is wrapped with a VPI paint and an oxygen glass low-glue mica tape, and then the alkali-free glass fiber insulation binding tape is wrapped; S4: Test-assemble the outlet box (8), bend and fix the bent lead (403); S5: The stator core (100) is baked and cured as a whole, with the curing temperature being not less than 155° C. and the curing time being not less than 15 hours.

10. The method for manufacturing the stator lead wire structure of the main helium blower according to claim 9, characterized in that: The stator lead wire (4) is a silicone rubber insulated motor lead wire with the silicone rubber part removed.

Images