Nuclear main pump structure for nuclear heat supply reactor

Abstract

The utility model discloses a nuclear main pump structure for a nuclear energy heat supply reactor, relates to the technical field of nuclear main pumps, solves the problems that the technical development of the nuclear main pump is incomplete and the nuclear main pump has defects, and is characterized in that a flow guide rib is arranged in a flared tube, so that the strength of the flared tube is increased, a flow stabilizing effect is achieved, a guide bearing is convenient to assemble, and the service life of the flared tube is prolonged. A sealing cavity is formed in the pump cover, the mechanical seal is assembled in the sealing cavity and flushed through a self-flushing structure, a drainage hole is formed in the pump cover and used for draining liquid leaked from the sealing cavity in the pump cover, and the flange is installed on the drainage hole and used for sealing the sealing cavity in the pump cover. Leaked liquid is collected through external connection of the flange, one end of the cooling water pipe fitting of the self-flushing structure is communicated with the mechanical seal, the other end of the cooling water pipe fitting of the self-flushing structure is communicated with the discharge port of the pump body, the mechanical seal is flushed through water discharged from the discharge port of the pump body, and the self-flushing function of the mechanical seal is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of nuclear main pumps, and in particular to a structure of a nuclear main pump for a nuclear heating reactor. Background Technology

[0002] The "pool-type cryogenic heating reactor" is a technologically mature and highly safe reactor type abroad, characterized by "zero" meltdown, "zero" emissions, easy decommissioning, and low investment. In addition to multiple safety barriers in the reactor, a high-pressure isolation loop is added to ensure radioactivity is isolated from the heating network. Pool-type cryogenic heating reactors offer flexible site selection, suitable for both inland and coastal areas, making them ideal for northern inland regions. The service life of a pool-type cryogenic heating reactor is 60 years. Economically, the heating price is far superior to that of natural gas and comparable to coal-fired power and combined heat and power (CHP). Reactor decommissioning is thorough, and the site can be reused in an environmentally friendly manner. Based on over fifty years of safe and stable operation of the pool-type research reactor, this safe, economical, and environmentally friendly reactor type was developed specifically for the heating needs of northern cities. Its principle involves placing the reactor core deep within an atmospheric pressure water pool, utilizing the hydrostatic pressure of the water layer to raise the core outlet water temperature to meet heating requirements. Heat is transferred to the heating loop through two stages of exchange, and then distributed to households via the heating network.

[0003] Currently, there are no commercially operating pool-type heating reactors in China, and their development is urgently needed. The nuclear main pump technology for pool-type heating reactors is even more pressing. Utility Model Content

[0004] In view of the aforementioned problems of incomplete development of nuclear main pump technology and the drawbacks of nuclear main pumps, the purpose of this utility model is to provide a nuclear main pump structure for nuclear heating reactors.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A nuclear main pump structure for a nuclear heating reactor, comprising:

[0007] Pump body 12 and base 5, pump body 12 is mounted on base 5, pump body 12 has a double volute structure, the bottom of pump body 12 has a vertical suction port, and the side wall of pump body 12 has a horizontal discharge port.

[0008] Pump cover 17 is installed on top of pump body 12;

[0009] Bearing body 20, which is mounted on top of pump cover 17;

[0010] Shaft 21 and bearing 24, the upper outer wall of shaft 21 and the inner wall of bearing body 20 are rotatably connected by at least one bearing 24, and shaft 21 passes through bearing body 20, pump cover 17 and pump body 12 from top to bottom;

[0011] A motor support 30 is installed on the top of the bearing body 20.

[0012] A motor 32 is installed on the top of the motor support 30.

[0013] A coupling 29 connects the upper end of the shaft 21 and the output shaft of the motor 32.

[0014] An impeller 9 is connected to the lower part of the shaft 21 through an impeller key 11.

[0015] The nuclear main pump structure for nuclear heat supply reactor as claimed in the above, further comprises: a bellmouth pipe 1, which is communicated with the suction inlet of the bottom of the pump body 12, and is provided with flow guide ribs inside.

[0016] The nuclear main pump structure for nuclear heat supply reactor as claimed in the above, further comprises: an oil cup 25 and a bearing gland 26, the oil cup 25 is installed on the upper surface of the top plate of the bearing body 20, the bottom of the oil cup 25 is abutted against the top of the bearing 24 on the upper side, and the bearing gland 26 is installed on the oil cup 25, the bottom of the bearing gland 26 is abutted against the top of the bearing 24 on the upper side.

[0017] The nuclear main pump structure for nuclear heat supply reactor as claimed in the above, further comprises: an oil collecting disc 22, which is installed on the lower surface of the top plate of the bearing body 20.

[0018] The nuclear main pump structure for nuclear heat supply reactor as claimed in the above, further comprises: an upper dustproof disc 27 and a lower dustproof disc 23, the bearing gland 26 and the shaft 21 are sealed by the upper dustproof disc 27, and the oil collecting disc 22 and the shaft 21 are sealed by the lower dustproof disc 23.

[0019] The nuclear main pump structure for nuclear heat supply reactor as claimed in the above, wherein the coupling 29 comprises: a sleeve 28 and a motor support 31, the sleeve 28 is connected with the motor support 31, the sleeve 28 is connected with the upper end of the shaft 21, and the motor support 31 is connected with the output shaft of the motor 32.

[0020] The nuclear main pump structure for nuclear heat supply reactor as claimed in the above, further comprises: an impeller sealing ring 8, which is installed in the bellmouth pipe 1, and the pump body 12 and the bellmouth pipe 1 are sealed by the impeller sealing ring 8.

[0021] The nuclear main pump structure for nuclear heat supply reactor as claimed in the above, further comprises: an impeller nut 7 and an impeller nut gasket 10, both of which are installed on the lower end of the shaft 21, and the impeller nut gasket 10 is located above the impeller nut 7.

[0022] Further comprising: a small round nut 2, a shaft sleeve 3 and a guide bearing 4, the shaft sleeve 3 is installed on the lower end of the shaft 21 through a key 6, the small round nut 2 is installed on the lower end of the shaft 21, the small round nut 2 is used for locking the shaft sleeve 3, the guide bearing 4 is installed on the guide rib, and the shaft sleeve 3 and the guide rib are rotatably connected through the guide bearing 4.

[0023] The nuclear main pump structure for the nuclear energy heat supply reactor further comprises a mechanical seal 18, the mechanical seal 18 is installed on the pump cover 17, and the pump cover 17 and the shaft 21 are sealed through the mechanical seal 18.

[0024] Further comprising: a self-flushing structure 19, the self-flushing structure 19 is installed in the bearing body 20, and the self-flushing structure 19 is communicated with the discharge port of the pump body 12.

[0025] The nuclear main pump structure for the nuclear energy heat supply reactor further comprises:

[0026] A pump cover sealing ring 13, the pump body 12 and the pump cover 17 are sealed through the pump cover sealing ring 13.

[0027] A sealing ring 14, the sealing ring 14 is installed in the pump cover 17, and the pump cover 17 and the shaft 21 are sealed through the sealing ring 14.

[0028] A winding pad 15, the winding pad 15 is installed in the pump cover 17, and the bearing body 20 and the pump cover 17 are sealed through the winding pad 15.

[0029] A flange 16, a drain hole is formed in the side wall of the pump cover 17 and communicated with the upper surface of the pump cover 17, and the flange 16 is installed on the drain hole.

[0030] The utility model discloses a nuclear main pump structure for nuclear energy heat supply reactor, which comprises a pump body 12, a shaft 21, a pump cover 17 and a bearing body 20.

[0031] (1) the utility model discloses a horn pipe is equipped with guide rib in it, has increased the strength of horn pipe, has played steady flow effect, simultaneously, it is convenient to assemble to guide bearing, protects guide bearing, avoids guide bearing to be bumped in the equipment operation process, has strengthened the strength of the suction part of pump body.

[0032] (2) the utility model discloses a pump cover is provided with sealed chamber, and mechanical seal is assembled in sealed chamber, and mechanical seal is washed through self-flushing structure, and the drain hole is formed on the pump cover, is used for discharging the liquid of sealed chamber leakage in the pump cover, and the flange is installed on the drain hole, and the liquid of leakage is collected through the flange external connection.

[0033] (3) the utility model discloses a motor is installed on the top of bearing body through motor support, and the output shaft of motor and the upper end of shaft are connected through the shaft coupling, and it is convenient to dismount and repair and replace.

[0034] (4) The utility model discloses a cooling water pipe of self-flushing structure is communicated with the side window and mechanical seal of bearing body in one end, and the other end of cooling water pipe of self-flushing structure is communicated with the discharge port of pump body, and the water of discharge port of pump body is washed to mechanical seal, realizes the self-flushing function of mechanical seal.

[0035] (5) The utility model discloses a plurality of balance holes are set up on the impeller, and the plurality of balance holes on the impeller balance part of axial force on the impeller in the equipment operation process, guarantee its smooth operation. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a kind of nuclear main pump structure's structural schematic diagram for nuclear energy heating reactor of the utility model.

[0037] In the drawing, 1 is a horn pipe, 2 is a small round nut, 3 is a shaft sleeve, 4 is a guide bearing, 5 is a base, 6 is a key, 7 is an impeller nut, 8 is an impeller sealing ring, 9 is an impeller, 10 is an impeller nut gasket, 11 is an impeller key, 12 is a pump body, 13 is a pump cover sealing ring, 14 is a sealing ring, 15 is a winding pad, 16 is a flange, 17 is a pump cover, 18 is a mechanical seal, 19 is a self-flushing structure, 20 is a bearing body, 21 is a shaft, 22 is an oil collecting pan, 23 is a lower dustproof disc, 24 is a bearing, 25 is an oil cup, 26 is a bearing gland, 27 is an upper dustproof disc, 28 is a clamping sleeve, 29 is a shaft coupling, 30 is a motor support, 31 is a motor support, and 32 is a motor. DETAILED DESCRIPTION

[0038] The utility model will be further described in connection with the drawings and specific embodiments, but not as the limitation of the utility model.

[0039] Please refer to Figure 1 It shows a kind of nuclear main pump structure for nuclear energy heating reactor, wherein, including:

[0040] Pump body 12 and base 5, pump body 12 is installed on base 5, pump body 12 is double volute structure, and the bottom of pump body 12 is provided with suction inlet along vertical direction, and the side wall of pump body 12 is provided with discharge outlet along horizontal direction;

[0041] Pump cover 17, pump cover 17 is installed on the top of pump body 12;

[0042] Bearing body 20, bearing body 20 is installed on the top of pump cover 17;

[0043] Shaft 21 and bearing 24, the outer wall of the upper portion of shaft 21 and the inner wall of bearing body 20 are rotatably connected by at least one bearing 24, and shaft 21 passes bearing body 20, pump cover 17 and pump body 12 in turn from top to bottom;

[0044] A motor support 30 is installed on the top of the bearing body 20;

[0045] A motor 32 is installed on the top of the motor support 30;

[0046] A coupling 29 is used to connect the upper end of the shaft 21 and the output shaft of the motor 32;

[0047] An impeller 9 is connected to the lower end of the shaft 21 through an impeller key 11.

[0048] Further, in a preferred embodiment, it further comprises a trumpet pipe 1 which is in communication with the suction inlet of the bottom of the pump body 12, and the trumpet pipe 1 is provided with flow guide ribs.

[0049] Further, in a preferred embodiment, it further comprises an oil cup 25 and a bearing gland 26, the oil cup 25 is installed on the upper surface of the top plate of the bearing body 20, the bottom of the oil cup 25 is in contact with the top of the upper bearing 24, and the bearing gland 26 is installed on the oil cup 25, the bottom of the bearing gland 26 is in contact with the top of the upper bearing 24.

[0050] Further, in a preferred embodiment, it further comprises an oil collecting disc 22 which is installed on the lower surface of the top plate of the bearing body 20.

[0051] Further, in a preferred embodiment, it further comprises an upper dustproof disc 27 and a lower dustproof disc 23, the bearing gland 26 and the shaft 21 are sealed by the upper dustproof disc 27, and the oil collecting disc 22 and the shaft 21 are sealed by the lower dustproof disc 23.

[0052] Further, in a preferred embodiment, the coupling 29 comprises a sleeve 28 and a motor support 31, the sleeve 28 and the motor support 31 are connected, the sleeve 28 is connected to the upper end of the shaft 21, and the motor support 31 is connected to the output shaft of the motor 32.

[0053] Further, in a preferred embodiment, it further comprises an impeller sealing ring 8 which is installed in the trumpet pipe 1, and the pump body 12 and the trumpet pipe 1 are sealed by the impeller sealing ring 8.

[0054] Further, in a preferred embodiment, it further comprises an impeller nut 7 and an impeller nut gasket 10, both of which are installed on the lower end of the shaft 21, and the impeller nut gasket 10 is above the impeller nut 7.

[0055] It further comprises a small round nut 2, a shaft sleeve 3 and a guide bearing 4, the shaft sleeve 3 is installed on the lower end of the shaft 21 through a key 6, the small round nut 2 is installed on the lower end of the shaft 21, the small round nut 2 is used to lock the shaft sleeve 3, and the guide bearing 4 is installed on the flow guide ribs, and the shaft sleeve 3 and the flow guide ribs are connected through the guide bearing 4.

[0056] Further, in a preferred embodiment, further comprising: a mechanical seal 18, the mechanical seal 18 is installed on the pump cover 17, the pump cover 17 and the shaft 21 are sealed through the mechanical seal 18;

[0057] Further comprising: a self-flushing structure 19, the self-flushing structure 19 is installed in the bearing body 20, the self-flushing structure 19 is communicated with the discharge port of the pump body 12.

[0058] Further, in a preferred embodiment, further comprising:

[0059] A pump cover sealing ring 13, the pump body 12 and the pump cover 17 are sealed through the pump cover sealing ring 13;

[0060] A sealing ring 14, the sealing ring 14 is installed in the pump cover 17, the pump cover 17 and the shaft 21 are sealed through the sealing ring 14;

[0061] A winding pad 15, the winding pad 15 is installed in the pump cover 17, the bearing body 20 and the pump cover 17 are sealed through the winding pad 15;

[0062] A flange 16, the side wall of the pump cover 17 is provided with a drain hole communicated with the upper surface thereof, and the flange 16 is installed on the drain hole.

[0063] The above is only a preferred embodiment of the present application, and does not limit the implementation and protection scope of the present application.

[0064] The present application further has the following implementation based on the above:

[0065] In a further embodiment of the present application, the utility model discloses: the purpose of the present application is to provide a pool type low-temperature nuclear energy heat supply nuclear main pump structure with simple structure, stable performance, reliability and safety. The technical scheme of the present application is: the nuclear main pump structure for nuclear energy heat supply nuclear main pump structure, the impeller 9 is sleeved on the shaft 21 through the impeller key 11, is connected with the impeller nut 7 and the impeller nut gasket 10, the impeller sealing ring 8 is sleeved in the horn pipe 1, the horn pipe 1 is connected with the pump body 12, the pump cover sealing ring 13 is connected on the pump cover 17, the shaft 21 passes through the pump cover 17, the pump cover 17 is connected with the pump body 12 and is sealed with the sealing ring 14 and the winding pad 15, the shaft 21 passes through the mechanical seal 18, the mechanical seal 18 is connected with the pump cover 17, the lower dustproof disc 23 is installed on the bearing body 20, the shaft 21 passes through the bearing body 20, the bearing body 20 and the pump cover 17 are connected together and are connected with the pump body 12 on the base 5, the shaft 21 passes through the bearing 24, the bearing 24 is installed on the bearing body 20, is fixed with the bearing pressure cover 26 and the sleeve 28, the upper dustproof disc 27 is connected with the bearing pressure cover 26, the motor 32 and the shaft coupling 29 and the motor support 30 are connected.

[0066] In a further embodiment of the utility model, the mechanical seal 18 of the pump is flushed by the water led out from the pump body 12.

[0067] In a further embodiment of the utility model, the pump shaft 21 is independent and not shared with the motor 32.

[0068] In a further embodiment of the utility model, the pump body 12 is of double volute structure, the shaft coupling 29 is a rigid shaft coupling, the mechanical seal 18 is a canned mechanical seal, the impeller 9 is a centrifugal impeller, and the pump cover 17 is provided with a flow discharge hole and a flange 16 connected with the outside.

[0069] In a further embodiment of the utility model, the bearing body 20 is provided with a side window, is internally connected with an oil collecting pan 22, is provided with a temperature measuring hole for a temperature sensor, and is further provided with an oil filler cup 25.

[0070] In a further embodiment of the utility model, the guide bearing 4 is clamped in the flow guide rib outside the outer ring of the shaft sleeve 3, the shaft sleeve 3 is sleeved on the outer wall of the impeller nut 7, and is fixed by the small round nut 2.

[0071] In a further embodiment of the utility model, the working process of the utility model is as follows: the shaft 21 rotates, drives the impeller 9 to rotate, sucks the medium into the pump body 12 through the flow guide rib plate of the horn pipe 1, rectifies the medium, increases the energy of the medium under the action of the impeller 9, and then discharges the medium outside the pump through the discharge port of the pump body 11.

[0072] In a further embodiment of the utility model, the nuclear main pump of the utility model has the characteristics that the horn pipe 1 is internally provided with flow guide ribs, which are used for stabilizing the sucked medium and protecting the guide bearing 4, and at the same time, the strength of the suction part of the pump body 12 is enhanced.

[0073] In a further embodiment of the utility model, the nuclear main pump of the utility model has the characteristics that the pump cover 17 plays a sealing cavity role, and at the same time, the pump cover 17 is also provided with a liquid discharge hole, which is used for discharging the leaked liquid in the sealing cavity. At the same time, the pump cover 17 is externally connected with the flange 16, which collects the leaked liquid.

[0074] In a further embodiment of the utility model, the nuclear main pump of the utility model has the characteristics that the pump part is a separate structure, is connected with the driving motor 32 through the shaft coupling 29, and is free to fold.

[0075] In a further embodiment of the utility model, the nuclear main pump of the utility model has the characteristics that the mechanical seal 18 is a self-flushing structure, which is simple in structure and does not need to be connected with a flushing pipe from the outside of the external unit.

[0076] In a further embodiment of the utility model, the nuclear main pump of the utility model has the characteristics that the impeller 9 is provided with a balance hole, which balances part of the axial force.

[0077] In a further embodiment of the utility model, the specific implementation mode is as shown in the figure Figure 1 As shown in the figure: the lower dustproof disc 23 is fixed on the shaft 21, the impeller sealing ring 8 is fixed on the trumpet pipe 1, the guide bearing 4 is fixed on the flow guide rib in the trumpet mouth 1, the sealing ring 14 and the winding pad 15 are sleeved in the corresponding grooves of the pump cover 17, the trumpet pipe 1 is sleeved in the base 5, then the mechanical seal 18 is sleeved on the shaft 21, and the mechanical seal 18 is fixed on the pump cover 17 after the pump cover 17 is sleeved on the shaft 21, the upper dustproof disc 27 is fixed on the shaft 21, and then the bearing body 20 is sleeved on the shaft 21 in the indicated state, and then the oil collecting disc 22 is fixed on the bearing body 20.

[0078] In a further embodiment of the utility model, the impeller 9 is sleeved on the shaft 21 by the impeller key 11, is fixed by the impeller nut 7 and the impeller nut gasket 10, the shaft sleeve 3 is sleeved on the shaft 21 by the key 6, the impeller nut 7 is tightened, and then the shaft sleeve 3 is reinforced by the pair of small round nuts 2.

[0079] In a further embodiment of the utility model, the base 5, the inlet trumpet pipe 1 and the pump cover 17 are installed together, the pump cover 17, the bearing body 20 and the pump body 12 are combined together, the bearing 24 is sleeved on the shaft 21, is fixed by the clamp sleeve 21, the bearing 24 outer ring is fixed by installing the bearing pressing cover 26 on the bearing body 20, and then the upper dustproof disc 27 is fixed on the clamp sleeve 28.

[0080] In a further embodiment of the utility model, the shaft coupling 29 is connected to the shaft 21 by the clamp sleeve 28, and then the motor support 31 is connected to the bearing body 20.

[0081] In a further embodiment of the utility model, the cooling water pipe of the self-flushing structure 19 is connected to the pump body 12 and the mechanical seal 18 respectively.

[0082] In a further embodiment of the utility model, finally, the motor 32 and the motor support 30 are connected together.

[0083] In a further embodiment of the utility model, the utility model relates to a nuclear main pump structure for a nuclear energy heat supply reactor, and the nuclear main pump structure mainly comprises a base 5, a pump body 12, a trumpet pipe 1, a flow guide rib, an impeller 9, a pump cover 17, a guide bearing 4, a mechanical seal 18, a pump shaft 21, a bearing body 20, a bearing 24, a bearing pressing cover 26, dustproof discs and the like. The nuclear main pump is an important component of a low-temperature pool type heat supply nuclear reactor primary loop system, is a new type of nuclear main pump, provides a power source for the circulation of a reactor primary loop system coolant, and is a primary loop heart equipment. The primary loop system is divided into four circulating loops, and one nuclear main pump is arranged in each loop. The nuclear main pump structure guarantees the integrity of the primary loop of a nuclear power station, has a simple structure, is novel, and is convenient to disassemble and assemble.

[0084] In the further embodiment of the utility model, the shaft 21 passes through the bearing body 20, the pump cover 17 and the pump body 12 from top to bottom in turn, the upper outer wall of the shaft 21 and the inner wall of the bearing body 20 are rotatably connected through at least one bearing 24, the top end of the shaft 21 is connected with the motor 32 through the shaft coupling 29, the oil collecting disc 22 is installed on the lower surface of the top plate of the bearing body 20, the oil cup 25 is installed on the upper surface of the top plate of the bearing body 20, the bottom of the oil cup 25 abuts against the top of the bearing 24 on the upper side, the bearing gland 26 is installed on the oil cup 25, the bottom of the bearing gland 26 abuts against the top of the bearing 24 on the upper side, the bearing gland 26 is used for pressing the bearing, the normal operation of the bearing 24 is ensured through the setting of the oil cup 25, the lubricating grease can be collected through the setting of the oil collecting disc 22, the lubricating grease is prevented from dropping into the bearing body 20, the mechanical seal 18 is arranged between the pump cover 17 and the shaft 21, the pump cover 17 and the shaft 21 are sealed through the mechanical seal 18, the bearing body 20 is provided with a side window, the self-flushing structure 19 is installed in the bearing body 20, the pump body 12 is of a double volute structure, the bottom of the pump body 12 is provided with a suction inlet along the vertical direction, the side wall of the pump body 12 is provided with a discharge outlet along the horizontal direction, one end of the cooling water pipe of the self-flushing structure 19 communicates with the side window and the mechanical seal 18 of the bearing body 20, the other end of the cooling water pipe of the self-flushing structure 19 communicates with the discharge outlet of the pump body 12, the water discharged through the discharge outlet of the pump body 12 is used for flushing the mechanical seal 18, the side wall of the pump cover 17 is provided with a leakage hole communicating with the upper surface thereof, which is used for discharging the liquid leaked in the sealed cavity of the pump cover 17, the flange 16 is installed on the leakage hole, the leaked liquid is collected through the external connection of the flange 16, the pump body 12 is installed on the base 5, the trumpet pipe 1 is arranged in the base 5, the trumpet pipe 1 communicates with the suction inlet at the bottom of the pump body 12, the trumpet pipe 1 is provided with a flow guide rib, which is used for guiding the flow direction of the medium flowing into the trumpet pipe 1, so that the inhaled medium is stabilized, the impeller 9 is arranged in the pump body 12, the impeller 9 and the lower part of the shaft 21 are connected through the impeller key 11, the motor 32 drives the shaft 21 to rotate and further drives the impeller 9 to rotate, so that the medium is inhaled into the pump body 12 through the suction inlet and discharged through the discharge outlet of the pump body 12.

[0085] In the further embodiment of the utility model, the impeller 9 is locked in the lower part of the shaft 21 through the impeller nut 7, the shaft sleeve 3 is sleeved on the lower part of the shaft 21 and is reinforced through the small round nut 2, so that the loosening of the impeller 9 is avoided and the equipment operation is affected, meanwhile, the outer wall of the shaft sleeve 3 is sleeved with the guide bearing 4, and the shaft sleeve 3 and the flow guide rib are rotatably connected through the guide bearing 4.

[0086] In the further embodiment of the utility model, the trumpet pipe 1 is provided with the flow guide rib, so that the strength of the trumpet pipe 1 is increased and the flow stabilization effect is achieved, meanwhile, the assembly of the guide bearing 4 is facilitated, the guide bearing 4 is protected, the guide bearing 4 is prevented from being bumped in the equipment operation process, and the strength of the inhaled part of the pump body 12 is enhanced.

[0087] In the further embodiment of the utility model, the pump cover 17 is provided with a sealing cavity, the mechanical seal 18 is assembled in the sealing cavity, the mechanical seal 18 is washed through the self-washing structure 19, the pump cover 17 is provided with a leakage hole, is used for discharging the liquid of the sealing cavity in the pump cover 17, the flange 16 is installed on the leakage hole, and the leakage liquid is collected through the flange 16.

[0088] In the further embodiment of the utility model, the motor 32 is installed on the top of the bearing body 20 through the motor support 30, the output shaft of the motor 32 and the upper end of the shaft 21 are connected through the shaft coupling 29, and the motor 32 is convenient to disassemble, maintain and replace.

[0089] In the further embodiment of the utility model, one end of the cooling water pipe of the self-washing structure 19 is communicated with the side window of the bearing body 20 and the mechanical seal 18, the other end of the cooling water pipe of the self-washing structure 19 is communicated with the discharge port of the pump body 12, the water discharged through the discharge port of the pump body 12 washes the mechanical seal 18, and the self-washing function of the mechanical seal 18 is realized.

[0090] In the further embodiment of the utility model, the impeller 9 is provided with a plurality of balance holes, the impeller 9 balances part of axial force on the impeller 9 through the plurality of balance holes on it during the equipment operation, and stable operation is ensured.

[0091] The above is only the preferred embodiment of the utility model, and does not limit the implementation mode and protection scope of the utility model, and for the person skilled in the art, it should be realized that the equivalent replacement and obvious change obtained from the application of the utility model specification and drawing contents should be contained in the protection scope of the utility model.

Claims

1. A nuclear primary pump structure for a nuclear energy heat supply reactor, characterized by, It includes: Pump body (12) and base (5), the pump body (12) is installed on the base (5), the pump body (12) is double volute structure, the bottom of the pump body (12) is provided with suction inlet along the vertical direction, the side wall of the pump body (12) is provided with discharge outlet along the horizontal direction; Pump cover (17), the pump cover (17) is installed on the top of the pump body (12); Bearing body (20), the bearing body (20) is installed on the top of the pump cover (17); Shaft (21) and bearing (24), the upper outer wall of the shaft (21) and the inner wall of the bearing body (20) are rotatably connected by at least one bearing (24), the shaft (21) passes through the bearing body (20), the pump cover (17) and the pump body (12) in turn from top to bottom; Motor support (30), the motor support (30) is installed on the top of the bearing body (20); Motor (32), the motor (32) is installed on the top of the motor support (30); Coupling (29), the upper end of the shaft (21) and the output shaft of the motor (32) are connected by the coupling (29); Impeller (9), the impeller (9) and the lower part of the shaft (21) are connected by the impeller key (11).

2. The nuclear power plant structure according to claim 1, wherein It also includes: Horn pipe (1), the horn pipe (1) communicates with the suction inlet of the bottom of the pump body (12), the horn pipe (1) is provided with guide ribs.

3. The nuclear power plant structure according to claim 1, wherein It also includes: Oil cup (25) and bearing gland (26), the oil cup (25) is installed on the top surface of the top plate of the bearing body (20), the bottom of the oil cup (25) abuts against the top of the upper bearing (24), the bearing gland (26) is installed on the oil cup (25), the bottom of the bearing gland (26) abuts against the top of the upper bearing (24).

4. The nuclear power plant structure according to claim 3, wherein It also includes: Oil collecting disc (22), the oil collecting disc (22) is installed on the lower surface of the top plate of the bearing body (20).

5. The nuclear power plant structure according to claim 4, wherein It also includes: Upper dustproof disc (27) and lower dustproof disc (23), the bearing gland (26) and the shaft (21) are sealed by the upper dustproof disc (27), the oil collecting disc (22) and the shaft (21) are sealed by the lower dustproof disc (23).

6. The nuclear power plant structure according to claim 1, wherein The coupling (29) includes: a sleeve (28) and a motor support (31), the sleeve (28) and the motor support (31) are connected, the sleeve (28) and the upper end of the shaft (21) are connected, and the motor support (31) and the output shaft of the motor (32) are connected.

7. The nuclear power plant structure according to claim 2, wherein It also includes: Impeller sealing ring (8), the impeller sealing ring (8) is installed in the horn pipe (1), and the pump body (12) and the horn pipe (1) are sealed by the impeller sealing ring (8).

8. The nuclear power plant structure according to claim 2, wherein It also includes: Impeller nut (7) and impeller nut gasket (10), the impeller nut (7) and the impeller nut gasket (10) are both installed on the lower end of the shaft (21), and the impeller nut gasket (10) is located above the impeller nut (7). Also include: small round nut (2), shaft sleeve (3) and guide bearing (4), shaft sleeve (3) is installed in the lower end of the shaft (21) through the key (6), small round nut (2) is installed in the lower end of the shaft (21), small round nut (2) is used for locking shaft sleeve (3), guide bearing (4) is installed on the guide rib, shaft sleeve (3) and guide rib are rotatably connected through guide bearing (4).

9. The nuclear power plant structure according to claim 2, wherein Also include: Mechanical seal (18), mechanical seal (18) is installed on the pump cover (17), the pump cover (17) and the shaft (21) are sealed through the mechanical seal (18); Also include: self-cleaning structure (19), the bearing body (20) is provided with the self-cleaning structure (19), and the self-cleaning structure (19) is communicated with the discharge port of the pump body (12).

10. The nuclear power plant structure according to claim 1, wherein Also include: Pump cover sealing ring (13), the pump body (12) and the pump cover (17) are sealed through the pump cover sealing ring (13); Sealing ring (14), the sealing ring (14) is installed in the pump cover (17), and the pump cover (17) and the shaft (21) are sealed through the sealing ring (14); Winding pad (15), winding pad (15) is installed in the pump cover (17), bearing body (20) and pump cover (17) are sealed through the winding pad (15); Flange (16), the sidewall of the pump cover (17) is provided with a flow hole communicated with the upper surface thereof, and the flange (16) is installed on the flow hole.

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