Gravel filter for nuclear power plant

Abstract

The utility model discloses a broken stone filter for a nuclear power plant, which comprises a driving motor, a transmission component connected with the driving motor, a backwashing hopper connected with the transmission component, a blowdown pipeline connected with the backwashing hopper, a positioning box and a stop component, the positioning box comprises a box body used for positioning the worm shaft and an end cover detachably connected with the box body, the worm shaft is provided with a free end far away from the driving motor, a matching part is arranged at the free end, a communicating hole corresponding to the free end is formed in the box body, and the locking assembly comprises a locking sleeve and a locking piece. A penetrating groove matched with the matching part is formed in the middle of the stop sleeve, and a plurality of stop grooves are formed in the outer wall face of the stop sleeve. The nuclear power plant gravel filter solves the problem that rotation of the transmission assembly cannot be limited online when the nuclear power plant gravel filter operates by arranging the stop assembly, and the purpose of online maintenance of the driving motor can be achieved.

Description

Technical Field

[0001] The utility model relates to the field of nuclear power plant equipment, in particular to a nuclear power plant gravel filter. Background Art

[0002] The gravel filter is installed in a pipe filled with seawater to filter out debris in the seawater and provide clean cooling water for the downstream condenser. The gravel filter has a drive motor with a brake device on the motor. When backwashing is not required, the brake device firmly holds the transmission system to prevent seawater from impacting the backwash bucket and causing the transmission system to continue to rotate. Once the motor brake device fails, the backwash bucket will continue to rotate at a high speed under the impact of seawater, damaging the transmission system and causing the filter to fail. Failure of the filter will cause the filter function to be lost, affecting the safety of the unit, causing the unit to shut down and bring economic losses.

[0003] If the motor fails and needs to be removed for repair or is intended for online repair, the problem of high-speed rotation of the transmission system after the motor is removed must be solved first. Otherwise, the drive motor cannot be reinstalled after repair, and online repair cannot be achieved. In the end, the unit can only be shut down for processing with a large loss of power generation revenue. Currently, there is a lack of a device that can solve the problem of online restriction of transmission system rotation when the system is running. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a nuclear power plant gravel filter.

[0005] The technical solution adopted by the utility model to solve the technical problem is: construct a nuclear power plant gravel filter, which includes a driving motor, a transmission assembly connected to the driving motor, a backwash bucket connected to the transmission assembly, a sewage pipeline connected to the backwash bucket, a positioning box and a stop assembly;

[0006] The transmission assembly includes a worm shaft connected to the output end of the drive motor;

[0007] The positioning box comprises a box body for positioning the worm shaft and an end cover detachably connected to the box body, the worm shaft has a free end arranged away from the drive motor, a matching portion is arranged on the free end, and a connecting hole corresponding to the free end is opened on the box body;

[0008] The stop assembly comprises a stop sleeve and a stop part, a through groove matching with the matching part is provided in the middle of the stop sleeve, and a plurality of stop grooves are provided on the outer wall surface of the stop sleeve;

[0009] The stopper may be inserted into the communicating hole and abut against the stopper groove to limit the rotation of the worm shaft.

[0010] In some embodiments, the number of the retaining grooves is four, and the four retaining grooves are evenly spaced along the circumferential direction of the retaining sleeve.

[0011] In some embodiments, the stopping groove is extended along the axial direction of the stopping sleeve.

[0012] In some embodiments, the communicating hole is a threaded hole, and the stopper is provided with a threaded portion corresponding to the threaded hole.

[0013] In some embodiments, the axial length of the stop sleeve is 60 mm to 70 mm.

[0014] In some embodiments, the outer diameter of the stop sleeve is 46 mm to 54 mm.

[0015] In some embodiments, the stop sleeve and the stop member are both made of metal.

[0016] In some embodiments, a sewage control valve is provided on the sewage pipeline.

[0017] In some embodiments, the nuclear power plant gravel filter further comprises a shell for positioning the backwash bucket, and the transmission assembly and the sewage pipeline are both mounted on the shell.

[0018] In some embodiments, a brake device is provided on the drive motor.

[0019] The implementation of the utility model has the following beneficial effects: when the driving motor of the nuclear power plant gravel filter needs to be repaired, the end cover can be disassembled, and then the through groove on the stop sleeve is used to match the matching part on the worm shaft, and the stop piece is inserted into the connecting hole and abutted on the stop groove, so that the worm shaft can be locked. After the worm shaft is locked, the transmission assembly is also locked as a whole, which solves the problem that the rotation of the transmission assembly cannot be restricted online when the nuclear power plant gravel filter is running, and can achieve the purpose of online maintenance of the driving motor. At the same time, the setting of the multiple stop grooves also facilitates the cooperation between the stop piece and the stop sleeve. The locking can be achieved by only abutting the stop piece on one of the stop grooves. The stop assembly is easy to install, has good adaptability, and is firmly close, suitable for installation at multiple angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0021] Figure 1 It is an overall schematic diagram of a nuclear power plant gravel filter of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the transmission assembly and the positioning box of the utility model;

[0023] Figure 3 This is a structural front view of the stop sleeve of the utility model;

[0024] Figure 4 It is a structural side view of the stop sleeve of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the stopper of the utility model. DETAILED DESCRIPTION

[0026] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0027] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0028] Reference Figures 1 to 5, is a nuclear power plant gravel filter in some embodiments of the utility model, which includes a driving motor 1, a transmission assembly 2 connected to the driving motor 1, a backwash bucket 3 connected to the transmission assembly 2, a sewage pipeline 4 connected to the backwash bucket 3, a positioning box 5 and a stop assembly 6. The transmission assembly 2 includes a worm shaft 21 connected to the output end of the drive motor 1, the positioning box 5 includes a box body 51 for positioning the worm shaft 21 and an end cover 52 detachably connected to the box body 51, the worm shaft 21 has a free end 211 away from the drive motor 1, the free end 211 is provided with a matching portion 212, the box body 51 is provided with a connecting hole 511 corresponding to the free end 211, the stop assembly 6 includes a stop sleeve 61 and a stop member 62, the middle of the stop sleeve 61 is provided with a through groove 611 matched with the matching portion 212, the outer wall surface of the stop sleeve 61 is provided with a plurality of stop grooves 612, the stop member 62 can be penetrated through the connecting hole 511 and abutted against the stop groove 612 to limit the rotation of the worm shaft 21. The drive motor 1 is provided with a brake holding device, and the matching portion 212 can be a flat key.

[0029] It can be understood that the nuclear power plant gravel filter can be installed in a pipe filled with seawater to filter out debris in the seawater and provide clean cooling water for the downstream condenser. The nuclear power plant gravel filter starts the drive motor 1 by monitoring the pressure difference at both ends of the filter. The drive motor 1 drives the transmission component 2 and the backwash bucket 3 to rotate. Because the sewage pipeline 4 connected to the backwash bucket 3 is facing the air, a local low-pressure area is formed on the filter mesh covered by the backwash bucket 3, and the seawater flows in the reverse direction, backwashing the debris on the mesh and discharging it through the sewage pipeline 4. When the backwash bucket 3 does not need to rotate, the brake device works, so that the transmission component 2 no longer moves, and the seawater is prevented from impacting the backwash bucket 3. Once the brake device fails, the nuclear power plant gravel filter will be damaged and fail. The failure of the nuclear power plant gravel filter will cause its filtering function to lose, affecting the safety of the unit, causing the unit to shut down and bring economic losses. Therefore, in this embodiment, when the driving motor 1 of the nuclear power plant gravel filter needs to be repaired, the end cover 52 can be disassembled, and then the through groove 611 on the stop sleeve 61 is used to match with the matching portion 212 on the worm shaft 21, and the stopper 62 is inserted into the connecting hole 511 and abutted against the stopper groove 612, so that the worm shaft 21 can be locked. After the worm shaft 21 is locked, the transmission assembly 2 is also locked as a whole, which solves the problem that the transmission assembly 2 cannot be online restricted from rotating when the nuclear power plant gravel filter is running, and can achieve the purpose of online maintenance of the driving motor 1. At the same time, the provision of the multiple stopper grooves 612 also facilitates the cooperation between the stopper 62 and the stopper sleeve 61. The locking can be achieved by only abutting the stopper 62 against one of the stopper grooves 612. The stopper assembly 6 is easy to install, has good adaptability, and is firmly close, suitable for installation at multiple angles.

[0030] like Figure 3 and Figure 4As shown, further, there are four stop grooves 612, which are evenly spaced along the circumferential direction of the stop sleeve 61, and can be adapted to installation conditions at multiple angles. In addition, the stop groove 612 is extended along the axial direction of the stop sleeve 61, and the stop groove 612 is generally waist-shaped, which makes it easier for the stopper 62 to abut against the stop groove 612.

[0031] In some embodiments, the axial length of the stop sleeve 61 is 60 mm to 70 mm, preferably 64 mm. The outer diameter of the stop sleeve 61 is 46 mm to 54 mm, preferably 50 mm.

[0032] In addition, the connecting hole 511 is a threaded hole, and the stopper 62 is provided with a threaded portion corresponding to the threaded hole. The threaded hole and the threaded portion are preferably M12 threads.

[0033] The stop sleeve 61 and the stop member 62 are both made of metal material, and the metal material may be aluminum alloy, carbon steel or stainless steel, which is not specifically limited here.

[0034] Furthermore, the transmission assembly 2 may also include a worm transmission-connected to the worm shaft 21 and a reducer transmission-connected to the worm.

[0035] like Figure 1 As shown, the sewage pipeline 4 is provided with a sewage control valve 41 to control the sewage switch of the sewage pipeline 4. The nuclear power plant gravel filter also includes a housing 7 for positioning the backwash bucket 3, and the transmission assembly 2 and the sewage pipeline 4 are both installed on the housing 7. The housing 7 is used to position the other components of the nuclear power plant gravel filter as a whole.

[0036] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A nuclear power plant gravel filter, characterized in that: It comprises a driving motor (1), a transmission assembly (2) connected to the driving motor (1), a backwash bucket (3) connected to the transmission assembly (2), a sewage discharge pipeline (4) connected to the backwash bucket (3), a positioning box (5) and a stop assembly (6); The transmission assembly (2) comprises a worm shaft (21) connected to the output end of the drive motor (1); The positioning box (5) comprises a box body (51) for positioning the worm shaft (21) and an end cover (52) detachably connected to the box body (51); the worm shaft (21) has a free end (211) arranged away from the drive motor (1); a matching portion (212) is provided on the free end (211); and a communicating hole (511) corresponding to the free end (211) is provided on the box body (51); The stop assembly (6) comprises a stop sleeve (61) and a stop part (62); a through groove (611) matching with the matching part (212) is provided in the middle of the stop sleeve (61); and a plurality of stop grooves (612) are provided on the outer wall surface of the stop sleeve (61); The stopper (62) can be inserted into the communicating hole (511) and abut against the stopper groove (612) to limit the rotation of the worm shaft (21).

2. The nuclear power plant gravel filter according to claim 1, characterized in that: The number of the retaining grooves (612) is four, and the four retaining grooves (612) are evenly spaced and arranged along the circumferential direction of the retaining sleeve (61).

3. The nuclear power plant gravel filter according to claim 1, characterized in that: The stopping groove (612) is arranged to extend along the axial direction of the stopping sleeve (61).

4. The nuclear power plant gravel filter according to claim 1, characterized in that: The communicating hole (511) is a threaded hole, and the stopper (62) is provided with a threaded portion corresponding to the threaded hole.

5. The nuclear power plant gravel filter according to claim 1, characterized in that: The axial length of the stop sleeve (61) is 60 mm to 70 mm.

6. The nuclear power plant gravel filter according to claim 1, characterized in that: The outer diameter of the stop sleeve (61) is 46 mm to 54 mm.

7. The nuclear power plant gravel filter according to claim 1, characterized in that: The stop sleeve (61) and the stop member (62) are both made of metal.

8. The nuclear power plant gravel filter according to claim 1, characterized in that: The sewage discharge pipeline (4) is provided with a sewage discharge control valve (41).

9. The nuclear power plant gravel filter according to claim 1, characterized in that: The nuclear power plant gravel filter also includes a shell (7) for positioning the backwash bucket (3), and the transmission assembly (2) and the sewage pipeline (4) are both installed on the shell (7).

10. The nuclear power plant gravel filter according to claim 1, characterized in that: The drive motor (1) is provided with a brake holding device.

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