阅读说明：本技术 一种1400mw核电机组用的设备冷却水泵 (Equipment cooling water pump for 1400MW nuclear power unit ) 是由 苏璟琛 赵芳 李娟娟 卢昭 杨群 范举 孙敏 于 2020-12-31 设计创作，主要内容包括：本发明提供了一种1400MW核电机组用的设备冷却水泵,包括泵体,密封连接在泵体上部的泵盖,及设置在泵体与泵盖之间的泵轴,所述泵盖与泵体连接处的泵轴两侧设置集装机械密封,所述泵轴中间键槽处设置叶轮,所述泵轴的驱动侧端部与驱动侧轴承体连接并经驱动侧轴承体与驱动机相连,所述泵轴非驱动侧端部容置于非驱动侧轴承体内,所述泵体两侧分别设置进口与出口。本发明提供的一种1400MW核电机组用的设备冷却水泵,保证在电厂运行的各个阶段,包括在地震过程中,设备冷却水泵都能可靠稳定的运行,持续为电厂提供冷却水。(The invention provides an equipment cooling water pump for a 1400MW nuclear power unit, which comprises a pump body, a pump cover and a pump shaft, wherein the pump cover is hermetically connected to the upper part of the pump body, the pump shaft is arranged between the pump body and the pump cover, integrated mechanical seals are arranged on two sides of the pump shaft at the joint of the pump cover and the pump body, an impeller is arranged at a middle key groove of the pump shaft, the driving side end part of the pump shaft is connected with a driving side bearing body and is connected with a driving machine through a driving side bearing body, the non-driving side end part of the pump shaft is accommodated in the non-driving side bearing body. The equipment cooling water pump for the 1400MW nuclear power unit provided by the invention can ensure that the equipment cooling water pump can reliably and stably operate in each stage of operation of a power plant, including in the earthquake process, and continuously provides cooling water for the power plant.)

1. The utility model provides an equipment cooling water pump that 1400MW nuclear power generating set used which characterized in that: the pump comprises a pump body, a pump cover and a pump shaft, wherein the pump cover is connected to the upper portion of the pump body in a sealing mode, the pump shaft is arranged between the pump body and the pump cover, container mechanical seals are arranged on two sides of the pump shaft at the joint of the pump cover and the pump body, an impeller is arranged at a middle key groove of the pump shaft, the driving side end portion of the pump shaft is connected with a driving side bearing body and is connected with a driving machine through a driving side bearing body, the non-driving side end portion of the pump shaft is contained in a non-.

2. The equipment cooling water pump for 1400MW nuclear power generating units according to claim 1, characterized in that: the pump body is located with the connection face of pump cover on the pump shaft central axis and horizontal direction.

3. The equipment cooling water pump for 1400MW nuclear power generating units according to claim 1, characterized in that: the impeller is a back-to-back centrifugal double-suction impeller, and a shaft sleeve and a locking nut which are sleeved on the pump shaft are respectively arranged on two sides of the joint of the impeller and the pump shaft.

4. The equipment cooling water pump for 1400MW nuclear power generating units according to claim 3, characterized in that: the same sealing rings are arranged at the contact positions of the front and the back of the impeller and the pump body and the pump cover.

5. The equipment cooling water pump for 1400MW nuclear power generating units according to claim 1, characterized in that: the drive side bearing body is fixed on the drive side bearing body support, and the non-drive side bearing body is fixed on the non-drive side bearing body support.

6. The equipment cooling water pump for 1400MW nuclear power generating units according to claim 5, characterized in that: a roller bearing sleeved on the pump shaft is arranged in the drive side bearing body, and a thrust bearing sleeved on the pump shaft is arranged in the non-drive side bearing body.

7. The equipment cooling water pump for 1400MW nuclear power generating units according to claim 1, characterized in that: the outer side of the roller bearing is provided with a first oil slinger sleeved on the pump shaft, and the outer side of the thrust bearing is provided with a second oil slinger sleeved on the pump shaft.

8. The equipment cooling water pump for 1400MW nuclear power generating units according to claim 1, characterized in that: the inlet and the outlet are both in flange connection with the pump body, and the inlet and the outlet are both in the horizontal direction.

9. The equipment cooling water pump for 1400MW nuclear power generating units according to claim 1, characterized in that: the container mechanical seal is a self-circulation container mechanical seal.

10. The equipment cooling water pump for 1400MW nuclear power generating units according to claim 1, characterized in that: and the driving side end part of the pump shaft is connected with a driving machine through a lengthened diaphragm coupling.

Technical Field

The invention relates to the technical field of nuclear power equipment, in particular to an equipment cooling water pump for a 1400MW nuclear power unit.

Background

The equipment cooling water pump is one of important equipment of the nuclear power station, and all the nuclear island equipment is cooled by the equipment cooling water system, is an important component of the equipment cooling water system, and is one of the key equipment of the nuclear power station. The main function of the equipment cooling water pump is to discharge heat generated by systems that may contain radioactive water, such as reactor cooling systems, chemical containment systems, waste heat removal systems, etc., to the plant water system during various stages of plant operation, including shutdown and after an accident. It therefore acts as a barrier between the radioactive system and the external environment.

Disclosure of Invention

The technical problem to be solved by the invention is to provide the equipment cooling water pump for the 1400MW nuclear power unit, which can ensure that the equipment cooling water pump can reliably and stably operate in each stage of the operation of a power plant, including in the earthquake process, and continuously provide cooling water for the power plant.

In order to solve the technical problem, the invention provides an equipment cooling water pump for a 1400MW nuclear power unit, which comprises a pump body, a pump cover and a pump shaft, wherein the pump cover is hermetically connected to the upper part of the pump body, the pump shaft is arranged between the pump body and the pump cover, container mechanical seals are arranged on two sides of the pump shaft at the joint of the pump cover and the pump body, an impeller is arranged at a middle key groove of the pump shaft, a driving side end part of the pump shaft is connected with a driving side bearing body and is connected with a driving machine through a driving side bearing body, a non-driving side end part of the pump shaft is accommodated in a non-driving side.

Furthermore, the connecting surface of the pump body and the pump cover is positioned on the central axis of the pump shaft and is in a horizontal direction.

Furthermore, the impeller is a back-to-back centrifugal double-suction impeller, and a shaft sleeve and a locking nut sleeved on the pump shaft are respectively arranged on two sides of the joint of the impeller and the pump shaft.

Furthermore, the same sealing rings are arranged at the contact positions of the front and the back of the impeller and the pump body and the pump cover.

Further, the drive side bearing body is secured to the drive side bearing body bracket and the non-drive side bearing body is secured to the non-drive side bearing body bracket.

Furthermore, a roller bearing sleeved on the pump shaft is arranged in the drive side bearing body, and a thrust bearing sleeved on the pump shaft is arranged in the non-drive side bearing body.

Furthermore, a first oil slinger sleeved on the pump shaft is arranged on the outer side of the roller bearing, and a second oil slinger sleeved on the pump shaft is arranged on the outer side of the thrust bearing.

Further, the inlet and the outlet are both in flange connection with the pump body, and the inlet and the outlet are both in the horizontal direction.

Further, the container mechanical seal is a self-circulation container mechanical seal.

Further, the drive side end of the pump shaft is connected to the drive machine via an elongated diaphragm coupling.

The equipment cooling water pump for the 1400MW nuclear power unit is a single-stage double-suction horizontal split centrifugal pump, is compact in structure, and has high use stability and safety reliability. And its import and export all set up on the pump body of pump shaft below, form the semi-spiral pumping chamber in the pump body, the relative stability that cooling water passes through the semi-spiral pumping chamber, can guarantee to flow in the impeller, can reduce hydraulic loss, improves the work efficiency of water pump. The equipment cooling water pump for the 1400MW nuclear power unit provided by the invention has the operation flow range of 1238-3580 m³The flow-lift curve with gentle decline is provided, the work is efficient, the cavitation allowance is low, and the requirement of the method can be completely metBasic service performance requirements of each system in the 1400MW nuclear power unit on the pump are met.

Drawings

FIG. 1 is a schematic diagram of an internal structure of an equipment cooling water pump for a 1400MW nuclear power unit, according to an embodiment of the present invention;

FIG. 2 is a side view of an equipment cooling water pump for a 1400MW nuclear power plant provided by an embodiment of the invention.

Wherein: the oil pump comprises a first oil slinger 1, a drive side bearing body 2, a cylindrical roller bearing 3, a pump cover 4, a sealing ring 5, an impeller 6, a pump body 7, a container mechanical seal 8, a pump shaft 9, a non-drive side bearing body support 10, a thrust bearing 11, a non-drive side bearing body 12, a second oil slinger 13, an outlet 14, a sealing gasket 15, an inlet 16, a drive side bearing body support 17, a first bolt 18, a first nut 19, a first washer 20, a second bolt 21, a second nut 22, a second washer 23, a shaft sleeve 24 and a locking nut 25.

Detailed Description

Referring to fig. 1, the equipment cooling water pump for the 1400MW nuclear power generating unit provided by the embodiment of the invention includes a pump body 7, a pump cover 4 hermetically connected to an upper portion of the pump body 7, and a pump shaft 9 disposed between the pump body 7 and the pump cover 4. The connecting surface of the pump cover 4 and the pump body 7 is positioned on the central line of the pump shaft 9 and is in a horizontal direction. A sealing gasket 15 is arranged between the connecting surface of the pump cover 4 and the pump body 7, and the pump cover 4, the sealing gasket 15 and the pump body 7 are tightly connected together through a first bolt 18, a first nut 19 and a first gasket 20, so that a semi-closed flow-through space with a hollow interior is formed in the pump body. When the maintenance is needed, all parts in the pump body 7 can be checked only by opening the pump cover 4, and the components such as the suction pipe, the discharge pipe, the prime motor and the like of the pump body do not need to be disassembled, so that the maintenance of the cooling water pump is very convenient.

An impeller 6 is fixedly installed at a middle key groove of the pump shaft 9, two sides of a joint of the impeller 6 and the pump shaft 9 are respectively provided with a shaft sleeve 24 and a locking nut 25 which are sleeved on the pump shaft 9, and the impeller 6 is positioned on the pump shaft 9 through the shaft sleeves 24 and the locking nuts 25 on the two sides. Set up collection dress mechanical seal 8 respectively in the pump shaft 9 both sides in axle sleeve 24 and lock nut 25 outside, set up collection dress mechanical seal 8 respectively at the drive side of pump shaft 9 and the pump cover 4 of non-drive side and the junction of the pump body 7 promptly, collection dress mechanical seal 8 at the drive side is fixed connection respectively on pump cover 4 and the pump body 7, collection dress mechanical seal 8 of non-drive side also is fixed connection respectively on pump cover 4 and the pump body 7, and this collection dress mechanical seal 8 is self-loopa formula collection dress mechanical seal, can make the pump cover 4 of dismantling pump shaft 9 both sides and the mechanical seal between the pump body 7 more convenient, can simplify the assembly procedure, reduce the assemble duration, provide the installation effectiveness.

The impellers 6 are back-to-back centrifugal double-suction impellers, and the impellers 6 are symmetrical in structure, so that axial force generated in the running process of the pump shaft 9 can be effectively balanced. Moreover, the same sealing rings 5 are arranged at the contact positions of the front and the back of the impeller 6 and the pump body 7 and the pump cover 4, so that the sealing rings 5 at the front and the back of the impeller 6 can be universal, namely the front and the back sealing rings 5 can be exchanged, and the replacement of the front and the back sealing rings 5 of the impeller 4 is convenient during maintenance. Because the contact department with the pump body 7, pump cover 4 all sets up sealing ring 5 around impeller 6, can guarantee the gas tightness between impeller 6 and the pump body 7, the pump cover 4 like this, not only can improve the work efficiency of cooling water pump, can also improve impeller 6's life simultaneously.

The drive-side end of the pump shaft 9 is arranged on the drive-side bearing body 2, and the drive-side end of the pump shaft 9 is connected to a drive machine via an elongated diaphragm coupling after passing out of the drive-side bearing body 2. The non-driving side end of the pump shaft 9 is accommodated in a non-driving side bearing body 12, and an inlet and an outlet are respectively arranged at two sides of the pump body. The drive-side bearing body 2 is fastened to the drive-side bearing body holder 17 by the second bolt 21, the second nut 22, and the second washer 23, and the non-drive-side bearing body 12 is fastened to the non-drive-side bearing body holder 10 by the second bolt 21, the second nut 22, and the second washer 23.

And, be provided with roller bearing 3 of cover on pump shaft 9 in the drive side bearing body 2, the outside of roller bearing 3 is provided with the first oil slinger 1 of cover on pump shaft 9, and roller bearing 3 in the drive side bearing body 2 relies on first oil slinger 1 to realize the self-lubricating. A thrust bearing 11 sleeved on the pump shaft 9 is arranged in the non-driving side bearing body 12, a second oil slinger 13 sleeved on the pump shaft 9 is arranged on the outer side of the thrust bearing 11, and the thrust bearing 11 in the non-driving side bearing body 12 realizes self-lubrication by means of the second oil slinger 13. The roller bearing 3 and the thrust bearing 11 are automatically lubricated respectively through the first oil slinger 1 arranged on the pump shaft 9 at the outer side of the roller bearing 3 and the second oil slinger 13 arranged on the pump shaft 9 at the outer side of the thrust bearing 11, and a lubricating device is not required to be externally connected to the roller bearing 3 and the thrust bearing 11, so that the cooling water pump mechanism is simpler and more compact and has higher safety and reliability. The roller bearing 3 on the driving side and the thrust bearing 11 on the non-driving side are used for radially supporting the pump shaft 9, and meanwhile, the thrust bearing 11 on the non-driving side can also effectively balance residual axial force, so that the stability of the cooling water pump during working can be enhanced.

Referring to fig. 2, the pump body 7 is provided with an inlet 16 and an outlet 14, respectively, and the inlet 16 and the outlet 14 are fixedly mounted on the pump body 7 in a flange connection manner. The inlet 16 and the outlet 14 are both horizontally oriented and on the same horizontal plane. Because the inlet 16 and the outlet 14 are both arranged on the pump body 7 below the central line of the pump shaft 9, and the inlet 16 and the outlet 14 are in the same horizontal plane in the horizontal direction, the special requirements of the installation of the cooling water pump can be met.

The invention provides an equipment cooling water pump for a 1400MW nuclear power unit, which is a single-stage double-suction horizontal split centrifugal pump, wherein the cooling water pump is arranged on a pump base through a support leg at the lower part of a pump body 7, and a driver drives a pump shaft 9 to rotate when working, so as to drive an impeller 6 arranged on the pump shaft 9 to rotate. Cooling water enters from the inlet 16, passes through the semi-spiral water pumping chamber in the pump body 7, is driven by the impeller 6 and then flows out from the outlet 14, so that the stability of relative flow of the cooling water in the impeller 6 is ensured, the hydraulic loss is reduced, and the working efficiency of the cooling water pump is improved. The 1400MW nuclear power unit equipment cooling water pump provided by the invention has the operation flow range of 1238-3580 m3/h, has a gently-reduced flow-lift curve, and can completely meet the basic service performance requirements of a nuclear power system on the pump.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.