CN213981208U - Pump set for nuclear power plant - Google Patents

Abstract

The utility model relates to the technical field of pumps for nuclear power plants, and discloses a pump set for nuclear power plants, which is mainly applied to important plant water taking structures of AP1000 and CAP1400 nuclear power plants, the submerged length of the pump is more than or equal to 6 meters, and comprises a pump assembly, a protective cylinder, a first mounting assembly and a second mounting assembly, wherein the first mounting assembly and the second mounting assembly are positioned on different mounting layers, the protective cylinder is mounted on the first mounting assembly, the pump assembly is mounted on the second mounting assembly, the weight of the pump assembly and the weight of the protective cylinder are independently carried by different mounting layers, and the protective cylinder is arranged, so that the pump can not be in direct contact with seawater flowing in an important plant water taking structure material flow passage of the nuclear power plant, the technical defects of operational vibration, large noise, easy loss of a motor bearing, swinging of the upper, middle and lower water pipe joints, easy breakage of the upper water pipe and the upper water pipe at the pump support seat are thoroughly solved, the pump for the nuclear power plant has the advantages that the running safety and reliability of the pump are improved, the service life of the pump is prolonged, and the running and maintenance cost of the pump is reduced.

Description

Pump set for nuclear power plant

Technical Field

The utility model relates to a nuclear power plant uses pump technical field, especially relates to a nuclear power plant uses pump package.

Background

In AP1000 and CAP1400 nuclear power plants, the cooling mode to the unit of nuclear power plant is to use the water pump to extract the sea water, cools down the unit equipment, ensures the safe and stable operation of nuclear power unit. The submerged length of the water pump is more than or equal to 6 meters, the working environment of the water pump is in seawater, the seawater contains silt and marine biological media, and the seawater flow can generate a large amount of vortexes, so that the stability of the water pump is affected.

In the existing pump technology for nuclear power plants, the weight and the axial force of a rotor of a pump are borne by a motor, so that the running temperature of the motor is high, and a bearing is easy to damage. The uplift water pipe is of a non-reinforced structure and is connected with the bent pipe, the uplift water pipe and the pump support can be driven by water thrust generated in the operation process of the pump, seawater lifting vortex and seawater flowing transverse thrust, multiple alternating fatigue is generated at the connection part of the uplift water pipe and the middle uplift water pipe, the connection part of the uplift water pipe and the middle uplift water pipe swings, and the guide bearing and the middle shaft are abraded due to eccentric vibration of the middle shaft. And, because the pump for nuclear power plant is installed in a suspended vertical manner, and the outside of the pump is not provided with a protective cylinder, the pump is in direct contact with seawater flowing in a water intake structure material flow passage of an important plant of the nuclear power plant, multiple irregular vortexes are generated by seawater flowing, water thrust and vibration force generated by the upper part of the bottom plate of the pump support and water thrust, seawater lifting vortex force, seawater flowing transverse thrust and vibration force generated by the lower part of the bottom plate of the pump support are all concentrated at the bottom plate of the pump support, and the upwelling water pipe and the upper shaft of the pump are subjected to multi-source fatigue fracture. In addition, the pump is not provided with all detection probes or is not sufficiently provided, the running condition of the pump cannot be monitored in real time, the problem of the pump is judged, the safety and reliability of the pump are not high, and the safe and stable running of the nuclear power unit is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: the utility model provides a nuclear power plant uses pump package to solve the important factory water intaking of prior art nuclear power plant pump and nuclear power plant and construct the seawater direct contact of flowing in the logistics channel, the seawater flows and produces multiple irregular swirl, the water thrust that the bottom plate upper portion of all pump supports produced, the water thrust that the bottom plate lower part of vibrational force and pump support produced, the seawater whirlpool power that rises and falls, the seawater flows transverse thrust, the bottom plate department of pump support is all concentrated to the vibrational force, cause the upwelling pipe and the upper shaft of pump to take place multisource fatigue fracture's technical problem.

In order to achieve the above object, the utility model provides a pump set for nuclear power plant, which comprises a pump assembly; the pump assembly comprises a motor, a motor base, a pump support, a thrust bearing assembly, a pump shaft, an upper pumping pipe, a middle pumping pipe, a lower pumping pipe, a water outlet horn, a guide vane, a pump cover and a filter screen; the motor is arranged on the motor base and connected with the pump shaft, and the motor base is arranged on the pump support; the thrust bearing assembly is sleeved on the pump shaft and then is connected with the pump support; the upper lifting pipe, the middle lifting pipe and the lower lifting pipe are sequentially connected to form a lifting pipe, the upper end of the upper lifting pipe is connected with the pump support, and the lower end of the lower lifting pipe is connected with the water outlet horn; the water outlet horn is connected with the guide vane, the guide vane is connected with the pump cover, and the pump cover is connected with the filter screen;

the device also comprises a protective cylinder, a first mounting assembly and a second mounting assembly; a pump well is preset in the primary soil layer;

the first installation assembly is connected with the surface or the inner wall of the primary soil layer, and the pile casing is installed on the first installation assembly;

an installation pit slot is preset at the edge of a wellhead of the pump well, the second installation assembly is located at a preset position of the installation pit slot, a secondary soil layer is filled in the installation pit slot to fix the second installation assembly, the second installation assembly and the first installation assembly are located on different installation layers, and the pump assembly penetrates through the casing and then is installed on the second installation assembly through the pump support.

In some embodiments of the present application, the first mounting assembly includes a first mounting plate and a first base plate; the first mounting plate is arranged on the surface of the primary soil layer, the inner edge of the first mounting plate is flush with the wellhead of the pump well, and the outer edge of the first mounting plate is located at the position corresponding to the mounting pit groove; the first bottom plate is positioned between the first mounting plate and the primary soil layer,

the second mounting assembly comprises a second mounting plate and foundation bolts; the lower end of the foundation bolt is positioned in the mounting pit groove, the upper end of the foundation bolt penetrates through the first mounting plate and is connected with the second mounting plate, so that a preset height is formed between the second mounting plate and the first mounting plate, and the inner edge of the second mounting plate is horizontally spaced from the inner edge of the first mounting plate by a preset distance;

and filling a secondary soil layer in the mounting pit slot to fix the first mounting plate, the second mounting plate and the foundation bolts simultaneously, enabling the inner edge of the secondary soil layer to be flush with the inner edge of the second mounting plate to form a secondary wellhead, enabling the casing to pass through the secondary wellhead and be mounted on the first mounting plate after the wellhead, and mounting the pump support on the second mounting plate.

In some embodiments of the present application, the first mounting assembly includes a first mounting plate, a side mounting plate, a first mounting rib, and a second mounting rib; two side mounting plates with a preset interval height are arranged on the inner wall of the pump well on a high liquid level, the first mounting rib is horizontally arranged on one side mounting plate, two ends of the second mounting rib are respectively connected with the other side mounting plate and the first mounting rib, and an included angle of 15-60 degrees is formed between the second mounting rib and the first mounting rib; the first mounting plate is arranged on the first mounting rib, and the inner edge of the first mounting plate is flush with the end part of the first mounting rib; at least three groups of first mounting ribs and second mounting ribs are arranged at equal intervals along the inner wall of the pump well; the protective cylinder is arranged on the first mounting plate after passing through the wellhead;

the second mounting assembly comprises a second mounting plate and foundation bolts; the lower extreme of rag bolt is located in the installation hole groove, its upper end with the second mounting panel is connected, makes the second mounting panel is located the surface on primary soil layer, to installation hole groove department fills secondary soil layer in order to fix second mounting panel and rag bolt, the pump support install in on the second mounting panel.

In some embodiments of this application, the bottom of protecting a section of thick bamboo is enclosed construction, the bottom of filter screen with the bottom of protecting a section of thick bamboo is apart from predetermined height, just the lower extreme of protecting a section of thick bamboo is equipped with the filtration pore along circumference interval ground.

In some embodiments of the present application, the filter pores are strip-shaped filter pores.

In some embodiments of the present application, the bottom of protecting the section of thick bamboo is open structure, the pump cover with be equipped with the hose between the filter screen, the bottom of protecting the section of thick bamboo with the hose with the contact surface parallel and level of filter screen.

In some embodiments of the present application, the outer wall of the uplift pipe is provided with a reinforcing through rib along the axial direction.

In some embodiments of the present application, a first side plate and a first support rib are further provided; the first side plate is arranged on the inner wall of the pump well, and the first supporting ribs are horizontally arranged between the first side plate and the outer wall of the protecting cylinder; and the first side plate and the first supporting rib are provided with at least three groups at equal intervals along the inner wall of the pump well.

In some embodiments of the present application, a second side plate and a second support rib are further provided; the second side plate is arranged on the inner wall of the pump well, the second support ribs are arranged between the second side plate and the outer wall of the protective cylinder and form an included angle of 12-75 degrees with the horizontal plane, and the second support ribs are positioned at the corresponding positions of the guide vanes; and at least three groups of second side plates and second support ribs are arranged at equal intervals along the inner wall of the pump well.

In some embodiments of the present application, the pump assembly is provided with a plurality of temperature probes, vibration probes and pressure probes;

a shaft seal is arranged in the pump support, a cooling coil is arranged in the thrust bearing assembly, a cooling pipe is arranged to communicate the cooling coil with the shaft seal, and the cooling pipe is provided with a pipe joint, an electromagnetic valve, an adjusting valve, the temperature probe and the pressure probe;

the temperature probes are arranged at two ends of the motor;

x, Y, Z of the motor base are both provided with the vibration probes upwards;

the temperature probe is arranged on the thrust bearing assembly;

the pressure probe is arranged on the pump support, and the temperature probes are arranged at the shaft seal and the guide bearing in the pump support;

x, Y, Z at the joint of the uplift pipe and the middle uplift pipe are both provided with the vibration probes upwards; the vibration probes are arranged in the X direction and the Y direction of the joint of the middle lifting pipe and the middle lifting pipe; the vibration probes are arranged on the X direction and the Y direction of the joint of the middle lifting pipe and the lower lifting pipe;

the temperature probes are arranged at the guide bearings at the joints of the upper lifting pipe and the middle lifting pipe, the middle lifting pipe and the middle lifting pipe, and the middle lifting pipe and the lower lifting pipe;

the guide bearings in the guide vanes are provided with the temperature probes; the vibration probes are arranged in the X direction and the Y direction at the joint of the guide vane and the pump cover;

and a conduit is axially arranged between the protective cylinder and the outer wall of the upper water lifting pipe, and leads of the temperature probe, the vibration probe and the pressure probe penetrate into the conduit.

The embodiment of the utility model provides a nuclear power plant uses pump package compares with prior art, and its beneficial effect lies in:

the utility model provides a pump package for nuclear power plant mainly is applied to in AP1000 and CAP1400 nuclear power plant's important factory's water intaking structure, and the length under the liquid of pump is more than or equal to 6 meters. The pump set for the nuclear power plant is provided with the casing, the pump cannot be in direct contact with seawater flowing in a water taking structure material flow channel of an important plant of the nuclear power plant, the installation layer of the pump and the installation layer of the casing are not on the same installation layer, the weight of the motor and the pump and the weight of the casing are independently borne on different installation layers, the technical defects that the existing pump is large in operation vibration and noise, the motor bearing is easy to wear, the connection part of the upper, middle and lower pumping pipes swings, and the upper pumping pipe and the upper shaft at the pump support seat are easy to break are thoroughly overcome, the operation safety and reliability of the pump for the nuclear power plant are improved, the service life of the pump is prolonged, the operation, maintenance and repair cost of the pump is reduced, and the safe operation of the nuclear power plant is guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a pump unit for a nuclear power plant according to embodiment 1 of the present invention;

FIG. 2 is an enlarged view at D of FIG. 1;

FIG. 3 is an enlarged view at D2 in FIG. 2;

FIG. 4 is an enlarged view at D1 of FIG. 2;

FIG. 5 is an enlarged view at F of FIG. 1;

FIG. 6 is an enlarged view of the screen and the casing in example 1;

FIG. 7 is an enlarged view of the screen and the casing in example 2;

FIG. 8 is an enlarged view at E in FIG. 1;

FIG. 9 is a schematic cross-sectional view taken along line A-A of FIG. 1;

FIG. 10 is a schematic cross-sectional view taken at B-B in FIG. 1;

fig. 11 is a schematic structural diagram of a pump unit for a nuclear power plant according to embodiment 3 of the present invention;

FIG. 12 is an enlarged view at G of FIG. 11;

FIG. 13 is an enlarged view at G1 in FIG. 12;

FIG. 14 is an enlarged view at G2 of FIG. 12;

FIG. 15 is a schematic cross-sectional view taken at C-C of FIG. 11;

in the figure, 1, a pump assembly; 101. an electric motor; 102. a motor base; 103. a pump support; 104. A thrust bearing assembly; 105. an upper water raising pipe; 106. a middle lifting pipe; 107. a water lifting pipe is arranged; 108. a water outlet horn; 109. a guide vane; 110. a pump cover; 111. filtering with a screen; 112. a corrugated hose; 113. shaft sealing; 114. a cooling tube; 115. a pipe interface; 116. adjusting a valve; 117. an electromagnetic valve; 118, 119, conduits; 120. reinforcing the steel bars; 2. protecting the cylinder; 201. strip-shaped filter holes; 3. a first mounting assembly; 31. a first mounting plate; 32. a first base plate; 33. a side mounting plate; 34. a first mounting rib; 35. a second mounting rib; 4. a second mounting assembly; 41. a second mounting plate; 42. anchor bolts; 5. a flange; 601. a first side plate; 602. a first support rib; 603. A second side plate; 604. a second support rib; 701-711, temperature probe; 801-; 901, 902, pressure probe.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Example 1

Referring to fig. 1, a pump set for nuclear power plant according to a preferred embodiment of the present invention includes a pump assembly 1, a casing 2, a first mounting assembly 3, and a second mounting assembly 4.

Specifically, referring to fig. 1 to 10, the pump assembly 1 includes a motor 101, a motor base 102, a pump support 103, a thrust bearing assembly 104, a pump shaft (not shown), an upper lift pipe 105, a middle lift pipe 106, a lower lift pipe 107, a water outlet horn 108, a guide vane 109, a pump cover 110, and a filter screen 111. Referring to fig. 2, the motor 101 is disposed on the motor base 102 and connected to the pump shaft, the motor base 102 is disposed on the pump support 103, and the thrust bearing assembly 104 is coupled to the pump support 103 after passing through the pump shaft. Referring to fig. 1, an upper lift pipe 105, a middle lift pipe 106 and a lower lift pipe 107 are sequentially connected through a bearing seat to form a lift pipe, the upper end of the upper lift pipe 105 is connected with a pump support 103, and the lower end of the lower lift pipe 107 is connected with a water outlet horn 108. The pump shaft is arranged in the water pumping pipe, the shaft sleeve is sleeved outside the pump shaft at intervals, and the guide bearing is arranged in the pump support 103 or the bearing seat and matched with the shaft sleeve. Referring to fig. 4, the water outlet horn 108 is connected to the guide vane 109, the guide vane 109 is connected to the pump cover 110, and the pump cover 110 is connected to the filter screen 111. Referring to fig. 2, the outer wall of the pumping pipe 105 is provided with a reinforcing through rib 120 in the axial direction.

Specifically, referring to fig. 2 and 3, a pump well is preset in a soil layer 01, and an installation pit 02 is preset at the edge of a wellhead of the pump well.

The first mounting assembly 3 includes a first mounting plate 31 and a first base plate 32. The first mounting plate 31 is arranged on the surface of the soil layer 01, the inner edge of the first mounting plate is flush with the wellhead of the pump well, the outer edge of the first mounting plate is located at the position corresponding to the mounting pit 02, and the first bottom plate 32 is located between the first mounting plate 31 and the soil layer 01. The second mounting assembly 4 includes a second mounting plate 41 and an anchor bolt 42. The lower end of the anchor bolt 42 is positioned in the mounting pit 02, and the upper end thereof passes through the first mounting plate 31 to be connected with the second mounting plate 41, so that the second mounting plate 41 and the first mounting plate 31 have a predetermined height therebetween, and the inner edge of the second mounting plate 41 is horizontally spaced from the inner edge of the first mounting plate 31 by a predetermined distance.

A secondary soil layer 03 (concrete) is filled at the installation pit 02 to fix the first installation plate 31, the second installation plate 41 and the anchor bolts 42 at the same time, and the inner edge of the secondary soil layer is leveled with the inner edge of the second installation plate 41 to form a secondary wellhead. The casing is installed on the first installation plate 31 through the flange 5 after passing through a secondary wellhead and a wellhead. The pump assembly 1 is inserted into the cartridge 2, and the bottom plate of the pump mount 103 is mounted on the second mounting plate 41, and ensures that the radial outer diameter of the pump assembly 1 does not contact the radial inner diameter of the cartridge 2.

Specifically, referring to fig. 5 and 6, the bottom end of the casing 2 is a closed structure, the bottom end of the filter screen 111 is spaced from the bottom end of the casing 2 by a predetermined height, and the bottom end of the casing 2 is circumferentially provided with strip-shaped filter holes 201 at intervals. The arrows in the figure indicate the direction of water flow.

Specifically, referring to fig. 1, a first side plate 601 and a first support rib 602 are further provided, the first side plate 601 is disposed on the inner wall of the pump well at intervals, and the first support rib 602 is horizontally disposed between the first side plate 601 and the outer wall of the casing 2. In this embodiment, referring to fig. 9 and 10, three sets of first side plates 601 and first support ribs 602 are provided at equal intervals along the inner wall of the pump well, and three first support ribs 602 are provided from top to bottom, and are respectively located at corresponding positions of the uplift pipe 105, the uplift pipe 106 and the guide vane 109, and the highest position is located on the high liquid level 04, and the lowest position is located below the low liquid level 05.

Specifically, referring to fig. 1, a second side plate 603 and a second support rib 604 are further provided. The second side plate 603 is arranged on the inner wall of the pump well, the second support rib 604 is arranged between the second side plate 603 and the outer wall of the casing 2, and forms an included angle of 12-75 degrees with the horizontal plane, and the second support rib 604 is positioned at the corresponding position of the guide vane 109. In this embodiment, referring to fig. 9 and 10, three sets of the second side plates 603 and the second support ribs 604 are provided at equal intervals along the inner wall of the pump well.

Referring to fig. 1, 9 and 10, arrows in the drawings indicate water flow directions, and vortexes indicate tumbling water flows, in this embodiment, the casing 2 and the primary soil layer 01 are fixed into a whole, and the pump assembly 1 is vertically suspended in the casing 2, so that when the pump assembly 1 stops or operates, the pump assembly 1 is not affected by any flowing state of seawater outside the casing 34. When the pump assembly 1 operates to extract seawater, the seawater flows into the filter screen 111 through the closed bottom end of the protective cylinder 2, is filtered and stabilized by the strip-shaped filter holes 201, the cleanness of the seawater extracted by the pump assembly 1 and the stability of the operation of the pump assembly 1 are ensured, and the technical defects that the operation vibration and the noise of the existing pump are high, the motor bearing is easy to lose, the connection part of an upper lifting water pipe, a middle lifting water pipe and a lower lifting water pipe swings, and an upper lifting water pipe and an upper shaft at a pump support seat are easy to break are thoroughly solved; the pump for the nuclear power plant has the advantages that the safe operation reliability of the pump for the nuclear power plant is improved, the service life of the pump is prolonged, the operation, maintenance and repair costs of the pump are reduced, and the safe operation of the nuclear power plant is ensured.

Example 2

The difference between this embodiment and embodiment 1 is that: the bottom end structure of the casing 2 and the structure between the pump cover 110 and the filter screen 111.

Referring to fig. 7, in the present embodiment, the bottom end of the casing 2 is an open structure, a corrugated hose 112 is disposed between the pump cover 110 and the filter screen 111, and the bottom end of the casing 2 is flush with the contact surface between the corrugated hose 112 and the filter screen 11.

In this embodiment, the bottom end of the casing 2 is an open bottom end, a corrugated hose 112 is installed between the pump cover 110 and the filter screen 111 of the pump assembly 1, and the bottom end of the casing is aligned with the contact surface between the corrugated hose 112 and the filter screen 111. The pump assembly 1 except that the filter screen 111 exposes the casing 2, the rest parts are all within the casing 2, when the pump assembly 1 stops or operates, after the filter screen 111 is influenced by the flow of seawater outside the casing 2, the corrugated hose 112 can eliminate the flow force of the seawater, and the stopping and the operation of the pump assembly 1 are ensured to be normal, thereby thoroughly solving the technical defects of operation vibration, high noise, easy loss of a motor bearing, swinging of the connection part of an upper lifting pipe, a middle lifting pipe and a lower lifting pipe, and easy breakage of the upper lifting pipe and the upper shaft at the pump support.

Example 3

This example differs from example 1 in that: the first mounting assembly 3 and the second mounting assembly 4 are configured and mounted.

In the present embodiment, referring to fig. 11 and 12, the first mounting assembly 3 includes a first mounting plate 31, a side mounting plate 33, a first mounting rib 34, and a second mounting rib 35. Two side mounting plates 33 with a preset interval height are arranged on the inner wall of the pump well on the high liquid level 04, a first mounting rib 34 is horizontally arranged on one side mounting plate 33, and two ends of a second mounting rib 35 are respectively connected with the other side mounting plate 33 and the first mounting rib 34. The first mounting plate 31 is provided on the first mounting rib 34 with its inner edge flush with the end of the first mounting rib 34. The second mounting rib 35 is located above the first mounting rib 34, and the second mounting rib 35 forms an included angle of 15-60 degrees with the first mounting rib 34. At least three sets of the first mounting ribs 34 and the second mounting ribs 35 are provided at equal intervals along the inner wall of the pump well, see fig. 15.

Referring to fig. 13, the second mounting assembly 4 includes a second mounting plate 41 and an anchor bolt 42. The lower end of the anchor bolt 42 is positioned in the mounting pit 02, and the upper end thereof is connected with the second mounting plate 41, so that the second mounting plate 41 is positioned on the surface of the primary soil layer 01, and a secondary soil layer 03 is filled in the mounting pit 02 to fix the second mounting plate 41 and the anchor bolt 42.

During actual installation, flange 5 welding is on protecting a section of thick bamboo 2, side-mounting board 33 passes through the bolt erection fixation at the pump well inner wall, the horizontal equipartition welded fastening of first installation muscle 34 is on side-mounting board 33, 35 contained angle equipartition welded fastening of second installation muscle is on side-mounting board 33 and first installation muscle 34, first installation board 31 welded fastening is on first installation muscle 34, it makes flange 5 and first installation board 31 cooperation back with the bolt locking fastening to insert first installation board 31 behind a section of thick bamboo 2 through the well head, pump module 2 inserts the well head and protects and install after 2 on primary soil layer 01 and secondary soil layer 03. The insertion of the pump assembly 1 into the cartridge 2 ensures that the radial outer diameter of the pump assembly 1 cannot come into contact with the radial inner diameter of the cartridge 2.

In this embodiment, the casing 2 is installed below the wellhead foundation layer and the installation position is located on the high liquid level 04. In the pump well, air is above the high liquid level 04, and water flow impact does not exist, so the part of the lifting pipe can be provided with no protective pipe 2. Since the material cost of the protection tube 2 is relatively expensive, the solution of the present embodiment requires a shorter protection tube 2 than that of embodiment 1, which contributes to cost saving. In addition, because the well head size of the pump well is preset and fixed, the size of the protection pipe 2 is not matched with the well head size necessarily, compared with embodiment 1, the scheme of the embodiment can solve the problem that the size of the protection pipe 2 is not matched with the well head size.

Example 4

This example differs from example 3 in that: embodiment 3 adopts the structure of the casing 2 of the closed bottom end in embodiment 1, and the embodiment adopts the structure of the casing 2 of the open bottom end in embodiment 2.

In the above embodiment, the pump assembly 1 is provided with a plurality of temperature probes, vibration probes and pressure probes.

Specifically, referring to fig. 2, temperature probes 701 and 702 are respectively disposed at two ends of the motor 101, and an X-direction vibration probe 801, a Y-direction vibration probe 802, and a Z-direction vibration probe 803 are mounted on the motor base 102. Referring to FIG. 4, a temperature probe 704 is mounted on thrust bearing assembly 104. The cooling pipe 114 passes through the pump support 103 and the motor base 102, then connects the shaft seal 113 of the pump support 103 and the thrust bearing assembly 104 to the bottom plate of the pump support 103. The cooling pipe 114 is provided with a pipe interface 115, and the electromagnetic valve 117, the regulating valve 116, the pressure probe 901 and the temperature probe 703 are mounted on the cooling pipe 114. The pump support 103 is provided with a pressure probe 902, and the shaft seal 113 of the pump support 103 is provided with a temperature probe 705 and a temperature probe 706 of a guide bearing. Referring to fig. 8, a vibration probe 804 in the X direction, a vibration probe 805 in the Y direction, and a vibration probe 806 in the Z direction are installed at the connection between the uplift pipe 105 and the uplift pipe 106. Referring to fig. 1, a temperature probe 707 is installed at the joint of the uplift pipe 105 and the uplift pipe 106, the joint of the uplift pipe 106 and the uplift pipe 106, and the guide bearing at the joint of the uplift pipe 106 and the uplift pipe 107. The joint of the middle water raising pipe 106 and the middle water raising pipe 106 in the middle is provided with an X-direction vibration probe 807 and a Y-direction vibration probe 808, and the joint of the middle water raising pipe 106 and the lower water raising pipe 107 is provided with an X-direction vibration probe 809 and a Y-direction vibration probe 810. Referring to FIG. 5, the guide bearings within the guide vanes 109 are fitted with temperature probe 708, temperature probe 709, temperature probe 710, and temperature probe 711. The guide vane 109 of the pump cover 110 is provided with an X-direction vibration probe 811 and a Y-direction vibration probe 812. The lead wires of the vibration probe 804, the vibration probe 805, the vibration probe 807, the vibration probe 808, the vibration probe 809, the vibration probe 810, the vibration probe 811 and the vibration probe 812 penetrate through the lead pipe 118, the lead pipe 118 penetrates through the bottom plate of the pump support 103 and then is fixed on the guide vane 109, the downdraft pipe 107, the uplift pipe 106 and the pump support 103, the lead wires of the vibration probe 806, the temperature probe 707, the temperature probe 711, the temperature probe 710, the temperature probe 709 and the temperature probe 708 penetrate through the lead pipe 119, and the lead pipe 119 penetrates through the bottom plate of the pump support 103 and then is fixed on the guide vane 109, the uplift pipe 107, the uplift pipe 106 and the pump support 103. Wherein, the number of the middle water raising pipe 106, the temperature probe 707, the temperature probe 711, the temperature probe 710, the temperature probe 709 and the temperature probe 708 is a plurality, and the number of the guide vanes 109 is more than or equal to 1.

Before the pump set is started, the central centralized control computer sends out an instruction, the electromagnetic valve 117 and the regulating valve 116 are opened, an external water source enters the thrust bearing assembly 104, the shaft seal 113 and the guide bearing of the pump set 1 to cool and lubricate the thrust bearing assembly, the shaft seal 113 and the guide bearing, the central centralized control computer sends out an instruction when the opening time of the electromagnetic valve 117 reaches a set value, the motor 101 starts the pump set 1 to operate, when the pressure probe 902 detects a set pressure signal, the central centralized control computer sends out an instruction, the electromagnetic valve 117 is closed, and the thrust bearing assembly 104, the shaft seal 113 and the guide bearing of the pump set 1 are cooled and lubricated by seawater pumped by the pump set 1. When the working condition of the pipe network system changes during the operation of the pump assembly 1 and the pressure probe 901 detects a set high pressure signal value, the central centralized control computer sends out an instruction, the regulating valve 116 slowly closes to regulate the pressure of the cooling pipe 114, and the regulating valve 116 stops until the pressure probe 901 detects a set value, so that the normal pressure in the cooling coil in the thrust bearing assembly 104 is maintained, and the normal operation of the pump assembly 1 is ensured. When the pressure probe 901 detects a set low-pressure signal value, the central centralized control computer sends a command, the regulating valve 116 is slowly opened to regulate the pressure of the cooling pipe 114, until the regulating valve 116 stops when the pressure probe 901 detects a set value, the normal pressure in the cooling coil pipe of the thrust bearing assembly 104 is maintained, and the normal operation of the pump assembly 1 is ensured. When the working condition of the pipe network system is seriously changed in the operation process of the pump assembly 1, when the temperature probe 703 detects a set high-temperature signal value, the central centralized control computer sends an instruction, the electromagnetic valve 117 and the regulating valve 116 are opened, the regulating valve 116 is stopped when the temperature probe 703 detects a set value, the electromagnetic valve 117 is continuously opened until the working condition of the pipe network system is recovered to be normal and then stopped, when the temperature probe 703 detects a set highest-temperature signal value, the central centralized control computer sends an instruction, the working condition of the pipe network system is regulated, and if the working condition is not improved, the pump assembly 1 stops operating.

In the operation process of the pump assembly 1, the vibration probe 801 detects the X-direction vibration value of the motor 101 and the motor base 102, the vibration probe 802 detects the Y-direction vibration value of the motor 101 and the motor base 102, the vibration probe 803 detects the Z-direction vibration value of the motor 101 and the motor base 102, and when each vibration probe detects the set highest vibration signal value, the central centralized control computer sends out an instruction, and the pump assembly 1 stops operating. The vibration probe 804 detects the X-direction vibration value of the joint of the uplift pipe 105 and the middle uplift pipe 106, the vibration probe 805 detects the Y-direction vibration value of the joint of the uplift pipe 105 and the middle uplift pipe 106, the vibration probe 806 detects the Z-direction vibration value of the joint of the uplift pipe 105 and the middle uplift pipe 106, and when each vibration probe detects the set highest vibration signal value, the central centralized control computer sends out an instruction, and the pump assembly 1 stops running. The vibration probe 807 detects the vibration value in the X direction at the joint of the middle lift pipe 106 and the middle lift pipe 106, the vibration probe 808 detects the vibration value in the Y direction at the joint of the middle lift pipe 106 and the middle lift pipe 106, and when each vibration probe detects the set highest vibration signal value, the central centralized control computer sends out an instruction, and the pump assembly 1 stops running. The vibration probe 809 detects the X-direction vibration value of the joint of the middle lift pipe 106 and the lower lift pipe 107, the vibration probe 810 detects the Y-direction vibration value of the joint of the middle lift pipe 106 and the lower lift pipe 107, and when each vibration probe detects the set highest vibration signal value, the central centralized control computer sends out an instruction, and the pump assembly 1 stops running. The vibration probe 811 detects the X-direction vibration value of the guide vane 109 at the lowermost end of the pump assembly 1, the vibration probe 812 detects the Y-direction vibration value of the guide vane 109 at the lowermost end of the pump assembly 1, and when each vibration probe detects a set highest vibration signal value, the central centralized control computer issues an instruction to stop the operation of the pump assembly 1.

In the operation process of the pump assembly 1, the temperature probe 701 detects the upper bearing temperature of the motor 101, the temperature probe 702 detects the lower bearing temperature of the motor 101, and when each temperature probe detects a set highest temperature signal value, the central centralized control computer sends out an instruction, and the pump assembly 1 stops operating. The temperature probe 704 detects the bearing temperature of the thrust bearing assembly 104, and when a set maximum temperature signal value is detected, the central centralized control computer sends out an instruction, and the pump assembly 1 stops running. The temperature probe 705 detects the temperature of the shaft seal 113 of the pump assembly 1, when a set high-temperature signal value is detected, the central centralized control computer sends out an instruction, the electromagnetic valve 117 is opened, the electromagnetic valve 117 is continuously opened when the temperature probe 705 detects a set value, the pump assembly 1 normally operates, and when the temperature probe 705 detects a set maximum temperature signal value, the central centralized control computer sends out an instruction, and the pump assembly 1 stops operating. The temperature probe 706 detects the temperature of the guide bearing at the pump support 103, the temperature probe 707 detects the temperature of the guide bearing at the joint of each lift pipe, the temperature probes 708, 709, 710 and 711 detect the temperature of the guide bearing at each guide vane 109, when each temperature probe detects a set high temperature signal value, the central centralized control computer sends out an instruction, the electromagnetic valve 117 is opened, the electromagnetic valve 117 is continuously opened when each temperature probe detects a set value, the pump assembly 1 normally operates, when each temperature probe detects a set maximum temperature signal value, the central centralized control computer sends out an instruction, and the pump assembly 1 stops operating. After the pump is processed by the technology, the actual operation condition of the pump can be monitored in real time, the operation problems of all parts of the pump are judged, the safe use of a pump set is ensured, and the safe operation of a nuclear power plant is ensured.

To sum up, the utility model provides a pump package for nuclear power plant mainly is applied to in AP1000 and CAP1400 nuclear power plant's important factory's water intaking structure, and the length is more than or equal to 6 meters under the liquid of pump. The pump motor does not bear the axial force of the pump, and each probe and valve arranged on the pump are connected with a computer of a central control room of a power plant, so that the running condition of the pump can be monitored in real time, and the problem of the pump can be judged. The pump set for the nuclear power plant is provided with the casing, the pump cannot be in direct contact with seawater flowing in a water taking structure material flow channel of an important plant of the nuclear power plant, the installation layer of the pump and the installation layer of the casing are not on the same installation layer, the weight of the motor and the pump and the weight of the casing are independently borne on different installation layers, the technical defects that the existing pump is large in operation vibration and noise, the motor bearing is easy to wear, the connection part of the upper, middle and lower pumping pipes swings, and the upper pumping pipe and the upper shaft at the pump support seat are easy to break are thoroughly overcome, the operation safety and reliability of the pump for the nuclear power plant are improved, the service life of the pump is prolonged, the operation, maintenance and repair cost of the pump is reduced, and the safe operation of the nuclear power plant is guaranteed.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims (10)

1. The pump set for the nuclear power plant comprises a pump assembly; the pump assembly comprises a motor, a motor base, a pump support, a thrust bearing assembly, a pump shaft, an upper pumping pipe, a middle pumping pipe, a lower pumping pipe, a water outlet horn, a guide vane, a pump cover and a filter screen;

the motor is arranged on the motor base and connected with the pump shaft, and the motor base is arranged on the pump support; the thrust bearing assembly is sleeved on the pump shaft and then is connected with the pump support; the upper lifting pipe, the middle lifting pipe and the lower lifting pipe are sequentially connected to form a lifting pipe, the upper end of the upper lifting pipe is connected with the pump support, and the lower end of the lower lifting pipe is connected with the water outlet horn; the water outlet horn is connected with the guide vane, the guide vane is connected with the pump cover, and the pump cover is connected with the filter screen;

the method is characterized in that:

the device also comprises a pile casing, a first mounting assembly and a second mounting assembly;

a pump well is preset in the primary soil layer;

the first installation assembly is connected with the surface or the inner wall of the primary soil layer, and the pile casing is installed on the first installation assembly;

an installation pit slot is preset at the edge of a wellhead of the pump well, the second installation assembly is located at a preset position of the installation pit slot, a secondary soil layer is filled in the installation pit slot to fix the second installation assembly, the second installation assembly and the first installation assembly are located on different installation layers, and the pump assembly penetrates through the casing and then is installed on the second installation assembly through the pump support.

2. Pump group for nuclear power plants according to claim 1,

the first mounting assembly comprises a first mounting plate and a first base plate; the first mounting plate is arranged on the surface of the primary soil layer, the inner edge of the first mounting plate is flush with the wellhead of the pump well, and the outer edge of the first mounting plate is located at the position corresponding to the mounting pit groove; the first bottom plate is positioned between the first mounting plate and the primary soil layer,

the second mounting assembly comprises a second mounting plate and foundation bolts; the lower end of the foundation bolt is positioned in the mounting pit groove, the upper end of the foundation bolt penetrates through the first mounting plate and is connected with the second mounting plate, so that a preset height is formed between the second mounting plate and the first mounting plate, and the inner edge of the second mounting plate is horizontally spaced from the inner edge of the first mounting plate by a preset distance;

and filling a secondary soil layer in the mounting pit slot to fix the first mounting plate, the second mounting plate and the foundation bolts simultaneously, enabling the inner edge of the secondary soil layer to be flush with the inner edge of the second mounting plate to form a secondary wellhead, enabling the casing to pass through the secondary wellhead and be mounted on the first mounting plate after the wellhead, and mounting the pump support on the second mounting plate.

3. Pump group for nuclear power plants according to claim 1,

the first mounting assembly comprises a first mounting plate, a side mounting plate, a first mounting rib and a second mounting rib; two side mounting plates with a preset interval height are arranged on the inner wall of the pump well on a high liquid level, the first mounting rib is horizontally arranged on one side mounting plate, two ends of the second mounting rib are respectively connected with the other side mounting plate and the first mounting rib, and an included angle of 15-60 degrees is formed between the second mounting rib and the first mounting rib; the first mounting plate is arranged on the first mounting rib, and the inner edge of the first mounting plate is flush with the end part of the first mounting rib; at least three groups of first mounting ribs and second mounting ribs are arranged at equal intervals along the inner wall of the pump well; the protective cylinder is arranged on the first mounting plate after passing through the wellhead;

the second mounting assembly comprises a second mounting plate and foundation bolts; the lower extreme of rag bolt is located in the installation hole groove, its upper end with the second mounting panel is connected, makes the second mounting panel is located the surface on primary soil layer, to installation hole groove department fills secondary soil layer in order to fix second mounting panel and rag bolt, the pump support install in on the second mounting panel.

4. Pump group for nuclear power plants according to claim 2 or 3, characterized in that the bottom end of the casing is of a closed structure, the bottom end of the filter screen is at a predetermined height from the bottom end of the casing, and the lower end of the casing is provided with filter holes at intervals along the circumferential direction.

5. Pump group for nuclear power plants according to claim 4, characterized in that said filtering holes are strip-shaped filtering holes.

6. The pump group for nuclear power plants according to claim 2 or 3, wherein the bottom end of the casing is of an open structure, a hose is arranged between the pump cover and the filter screen, and the bottom end of the casing is flush with the contact surface of the hose and the filter screen.

7. Pump package for nuclear power plants according to claim 2 or 3, characterized in that the outer wall of the uplift pipe is provided with reinforcement ribs in the axial direction.

8. The nuclear power plant pump package according to claim 2 or 3, further provided with a first side plate and a first support rib; the first side plate is arranged on the inner wall of the pump well, and the first supporting ribs are horizontally arranged between the first side plate and the outer wall of the protecting cylinder; and the first side plate and the first supporting rib are provided with at least three groups at equal intervals along the inner wall of the pump well.

9. The pump package for nuclear power plants according to claim 8, characterized in that a second side plate and a second support rib are further provided; the second side plate is arranged on the inner wall of the pump well, the second support ribs are arranged between the second side plate and the outer wall of the protective cylinder and form an included angle of 12-75 degrees with the horizontal plane, and the second support ribs are positioned at the corresponding positions of the guide vanes; and at least three groups of second side plates and second support ribs are arranged at equal intervals along the inner wall of the pump well.

10. The nuclear power plant pump package according to claim 2 or 3, wherein a plurality of temperature probes, vibration probes and pressure probes are arranged on the pump package;

a shaft seal is arranged in the pump support, a cooling coil is arranged in the thrust bearing assembly, a cooling pipe is arranged to communicate the cooling coil with the shaft seal, and the cooling pipe is provided with a pipe joint, an electromagnetic valve, an adjusting valve, the temperature probe and the pressure probe;

the temperature probes are arranged at two ends of the motor;

x, Y, Z of the motor base are both provided with the vibration probes upwards;

the temperature probe is arranged on the thrust bearing assembly;

the pressure probe is arranged on the pump support, and the temperature probes are arranged at the shaft seal and the guide bearing in the pump support;

x, Y, Z at the joint of the uplift pipe and the middle uplift pipe are both provided with the vibration probes upwards; the vibration probes are arranged in the X direction and the Y direction of the joint of the middle lifting pipe and the middle lifting pipe; the vibration probes are arranged in the X direction and the Y direction at the joint of the middle lifting pipe and the lower lifting pipe;

the temperature probes are arranged at the guide bearings at the joints of the upper lifting pipe and the middle lifting pipe, the middle lifting pipe and the middle lifting pipe, and the middle lifting pipe and the lower lifting pipe;

the guide bearings in the guide vanes are provided with the temperature probes; the vibration probes are arranged in the X direction and the Y direction at the joint of the guide vane and the pump cover;

and a conduit is axially arranged between the protective cylinder and the outer wall of the upper water lifting pipe, and leads of the temperature probe, the vibration probe and the pressure probe penetrate into the conduit.

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