Primary helium fan impeller locking device

Abstract

The utility model belongs to the technical field of primary helium fans, and particularly relates to a primary helium fan impeller locking device. According to the technical scheme, the main helium fan impeller locking device comprises a rotating shaft, the rotating shaft is connected with an impeller, the lower end of the rotating shaft is connected with an impeller supporting disc used for axially positioning the impeller, the lower end of the impeller supporting disc is connected with a joint round head, and the lower surface of the impeller, the outer surface of the impeller supporting disc and the outer surface of the joint round head are in smooth transition. The utility model provides the locking device for the impeller of the primary helium fan, which can ensure the safe and stable operation of the primary helium impeller.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of main helium fan, especially relates to main helium fan impeller locking device. BACKGROUND

[0002] High temperature gas cooled reactor adopts helium as coolant which is chemically inert and has good thermal performance, adopts spherical fuel element which is wrapped fuel particle of full ceramic type which has excellent binding performance of radioactive fission product and is dispersed in graphite matrix, and adopts graphite as moderator and core structure material which is resistant to high temperature, and high temperature gas cooled reactor is advanced nuclear reactor which has good inherent safety, high power generation efficiency and very wide application. High temperature gas cooled reactor nuclear power station drives helium coolant in primary loop to circulate by main helium fan. Main helium fan is the "heart" component of gas cooled reactor, and is key component for guaranteeing nuclear power operation safety and controlling circulation of cooling medium. Main helium fan is vertical centrifugal compressor, motor is coaxial with impeller, is installed above pressure vessel of steam generator, and overall structure of main helium fan includes fan cavity and motor cavity, mechanical components such as impeller and diffuser are arranged in fan cavity and are directly contacted with 250 DEG C helium, and electrical components such as motor are arranged in motor cavity.

[0003] Impeller of main helium fan is driven by motor, is coaxial with motor, and is cantilevered to be installed on the shaft end of motor. Helium coolant is pressurized to 7MPa by impeller, is forced to circulate in primary loop of reactor, is heated to be raised in temperature by taking away heat from core, is cooled by passing through steam generator and by transferring heat to water in secondary loop, forms closed cycle, and is key component for guaranteeing nuclear power operation safety. Rotating speed range of main helium fan is 750-4560r / min, linear speed of impeller is as high as 240m / s, and reliability and safety of impeller are very important. UTILITY MODEL CONTENTS

[0004] In order to solve the above problems in the prior art, the purpose of the utility model is to provide a main helium fan impeller locking device for guaranteeing safe and stable operation of main helium impeller.

[0005] The technical scheme adopted by the utility model is:

[0006] The main helium fan impeller locking device comprises a rotating shaft, the rotating shaft is connected with an impeller, the lower end of the rotating shaft is connected with an impeller support disc for axially positioning the impeller, the lower end of the impeller support disc is connected with a round head, and the lower surface of the impeller, the outer surface of the impeller support disc and the outer surface of the round head are smoothly connected.

[0007] The impeller support disc is connected with the round head, so that the lower surface of the impeller, the outer surface of the impeller support disc and the outer surface of the round head can form a smooth transition curved surface, and the airflow direction is stable.

[0008] As a preferred scheme of the utility model, the lower section of the rotating shaft is processed with a taper, and the impeller is hot-jacketed on the taper section of the rotating shaft through a key.

[0009] As a preferred scheme of the utility model, the through counterbore and the stepped hole are arranged on the impeller support disc, the lower end of the rotating shaft is connected with the impeller support disc through a bolt, and the bolt is pressed in the counterbore after passing through the stepped hole. The bolt is an internal hexagonal bolt.

[0010] As a preferred scheme of the utility model, a steel sleeve is placed in the counterbore, and the bolt is combined with the end of the rotating shaft after passing through the steel sleeve and the stepped hole.

[0011] As a preferred scheme of the utility model, an external thread surface is arranged on the impeller support disc, and an internal thread surface is arranged in the round head, and the external thread surface of the impeller support disc is threadedly connected with the internal thread surface of the round head.

[0012] As a preferred scheme of the utility model, a threaded hole is arranged on the impeller support disc, a through hole is arranged on the round head, a screw is threadedly connected in the threaded hole, and the end of the screw is located in the through hole of the round head. After the screw is combined, a part is located in the steel wire screw sleeve, and the other part is located in the through hole, so that the round head is prevented from rotating relative to the impeller support disc. The screw is an internal hexagonal flat end set screw.

[0013] As a preferred scheme of the utility model, a steel wire screw sleeve is placed in the threaded hole, and the screw is fixed to the steel wire screw sleeve through the through hole. The size of the through hole is slightly larger than the outer circle size of the screw and smaller than the size of the threaded hole, so that the axial movement of the steel wire screw sleeve is prevented. The threaded sleeve is a self-locking threaded sleeve or a bolt type threaded sleeve, so that the axial movement of the screw is effectively prevented.

[0014] As a preferred scheme of the utility model, a rotating shaft matching surface and a round head matching surface are arranged on the impeller support disc, an impeller support disc matching surface is arranged on the round head, the rotating shaft matching surface is matched with the end surface of the rotating shaft, the round head matching surface is matched with the impeller support disc matching surface, and the axial displacement of the steel sleeve and the bolt is limited.

[0015] As a preferred scheme of the utility model, the outer surface of the round head comprises a taper surface and a spherical surface, and the taper surface is smoothly transitioned with the outer surface of the impeller support disc.

[0016] As a preferred scheme of the utility model, a jacking hole is arranged on the impeller support disc.

[0017] The beneficial effects of this utility model are as follows:

[0018] This invention utilizes an impeller support disc to position the impeller bearings, ensuring reliable impeller installation. The lower end of the impeller support disc connects to a handle head, allowing a smooth transition surface to be formed between the lower surface of the impeller, the outer surface of the impeller support disc, and the outer surface of the handle head, thus ensuring stable airflow direction. This invention features simple structure, safety and reliability, low cost, and strong feasibility. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model when the screw is parallel to the shaft;

[0020] Figure 2 This is a schematic diagram of the structure of this utility model when the screw is perpendicular to the shaft;

[0021] Figure 3 This is a cross-sectional view of the impeller support disc;

[0022] Figure 4 This is a top view of the impeller support disc;

[0023] Figure 5 It is a cross-sectional view of the round head.

[0024] In the diagram: 1-Shaft; 2-Key; 3-Impeller; 4-Impeller support disc; 5-Handling round head; 6-Wire thread sleeve; 7-Steel sleeve; 8-Bolt; 9-Screw; 401-Impeller mating surface; 402-Shaft mating surface; 403-External thread surface; 404-Round head mating surface; 405-Counterhole; 406-Stepped hole; 407-Pulley hole; 408-Threaded hole; 501-Internal thread surface; 502-Impeller support disc mating surface; 503-Conical surface; 504-Spherical surface; 505-Through hole. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0027] As Figures 1-5 The main helium fan impeller locking device of the embodiment, as shown in the drawings, comprises a rotating shaft 1, the rotating shaft 1 is connected with an impeller 3, the lower end of the rotating shaft 1 is connected with an impeller support disc 4 for axially positioning the impeller 3, the lower end of the impeller support disc 4 is connected with a round head 5, and the lower surface of the impeller 3, the outer surface of the impeller support disc 4 and the outer surface of the round head 5 are smoothly transitioned.

[0028] The impeller support disc 4 of the utility model positions the impeller 3 by bearings, thereby ensuring reliable installation of the impeller 3. The lower end of the impeller support disc 4 is connected with the round head 5, so that the lower surface of the impeller 3, the outer surface of the impeller support disc 4 and the outer surface of the round head 5 can form a smoothly transitioned curved surface, thereby ensuring stable airflow direction. The utility model has the characteristics of simple structure, safety and reliability, low cost and strong implementability.

[0029] Specifically, the lower section of the rotating shaft 1 is processed with a taper, and the impeller 3 is hot-jacketed on the tapered section of the rotating shaft 1 through a key 2.

[0030] The impeller support disc 4 is connected with the lower end of the rotating shaft 1 through a bolt 8, and the bolt 8 is compressed in the counterbore 405 after passing through the stepped hole 406. The bolt 8 is an internal hexagonal bolt 8.

[0031] Furthermore, a steel sleeve 7 is placed in the counterbore 405, and the bolt 8 is combined with the end of the rotating shaft 1 after passing through the steel sleeve 7 and the stepped hole 406.

[0032] Specifically, the impeller support disc 4 is provided with an external thread surface 403, the round head 5 is provided with an internal thread surface 501, and the external thread surface 403 of the impeller support disc 4 is threadedly connected with the internal thread surface 501 of the round head 5.

[0033] The impeller support disc 4 is provided with a threaded hole 408, the round head 5 is provided with a through hole 505, a screw 9 is threadedly connected in the threaded hole 408, and the end of the screw 9 is located in the through hole 505 of the round head 5. After the screw 9 is combined, a part is located in the steel wire sleeve 6, and the other part is located in the through hole 505, thereby avoiding rotation of the round head 5 relative to the impeller support disc 4. The screw 9 is an internal hexagonal flat end set screw 9.

[0034] Further, a steel wire sleeve 6 is placed in the threaded hole 408, and a screw 9 is fixed to the steel wire sleeve 6 through a through hole 505. The size of the through hole 505 is slightly larger than the outer diameter of the screw 9 and smaller than the size of the threaded hole 408, so as to prevent the axial movement of the steel wire sleeve 6. The threaded sleeve 7 is a self-locking threaded sleeve 7 or a bolt-type threaded sleeve 7, which effectively prevents the axial movement of the screw 9.

[0035] The impeller support disc 4 is provided with a shaft 1 matching surface and a round head matching surface 404, and the round head 5 is provided with an impeller support disc 4 matching surface. The shaft 1 matching surface is matched with the end surface of the shaft 1, and the round head matching surface 404 is matched with the impeller support disc 4 matching surface, and the axial displacement of the sleeve 7 and the bolt 8 is limited.

[0036] The outer surface of the round head 5 includes a conical surface 503 and a spherical surface 504, and the conical surface 503 is smoothly transitioned with the outer surface of the impeller support disc 4.

[0037] The impeller support disc 4 is provided with a jacking hole 407.

[0038] The utility model is not limited to the above optional implementation, anyone can draw other various forms of product under the enlightenment of the utility model, but no matter make any change in its shape or structure, any technical scheme falling into the scope defined by the utility model claims falls into the protection scope of the utility model.

Claims

1. A main helium blower impeller locking device, characterized by: The impeller support disc (4) is provided with a through hole (405) and a stepped hole (406), the lower end of the impeller support disc (4) is connected with the lower end of the rotating shaft (1) through a bolt (8), the bolt (8) is pressed in the through hole (405) after passing through the stepped hole (406). The impeller support disc (4) is provided with an external thread surface (403), the knob head (5) is provided with an internal thread surface (501), and the external thread surface (403) of the impeller support disc (4) is threadedly connected with the internal thread surface (501) of the knob head (5). The lower section of the rotating shaft (1) is processed with a taper, and the impeller (3) is hot-mounted on the tapered section of the rotating shaft (1) through a key (2).

2. The main helium blower impeller locking device of claim 1, wherein: The through hole (405) is placed with a steel sleeve (7), and the bolt (8) is fitted on the end of the rotating shaft (1) after passing through the steel sleeve (7) and the stepped hole (406).

3. The main helium blower impeller locking device of claim 1, wherein: The impeller support disc (4) is provided with a threaded hole (408), the knob head (5) is provided with a through hole (505), the threaded hole (408) is threadedly connected with a screw (9), and the end of the screw (9) is located in the through hole (505) of the knob head (5).

4. The main helium blower impeller locking device of claim 1, wherein: The threaded hole (408) is placed with a steel wire screw sleeve (6), and the screw (9) is fixed to the steel wire screw sleeve (6) through the through hole (505).

5. The main helium blower impeller locking device of claim 4, wherein: The impeller support disc (4) is provided with a rotating shaft (1) matching surface and a knob head matching surface (404), the knob head (5) is provided with an impeller support disc (4) matching surface, the rotating shaft (1) matching surface is matched with the end surface of the rotating shaft (1), and the knob head matching surface (404) is matched with the impeller support disc (4) matching surface.

6. The main helium blower impeller locking device of claim 1, wherein: The external surface of the knob head (5) comprises a taper surface (503) and a spherical surface (504), and the taper surface (503) is smoothly transitioned with the external surface of the impeller support disc (4).

7. The main helium blower impeller locking device of claim 1, wherein: The impeller support disc (4) is provided with a jacking hole (407).

8. The main helium blower impeller locking device according to any one of claims 1-7, characterized in that: ​

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