Centrifugal ore slurry preheater feed pump and feed pump system

Abstract

Disclosed in the present application are a centrifugal ore slurry preheater feed pump and a feed pump system. The centrifugal ore slurry preheater feed pump comprises a drive unit, a centrifugal unit and a sealing and cooling unit. The centrifugal unit comprises an impeller and an impeller shroud structure, wherein the impeller is rotatably arranged inside the impeller shroud structure; a plurality of medium channels are formed in the impeller shroud structure by means of a plurality of blades of the impeller; one side of the impeller is connected to the drive unit, and the other side thereof is provided with an opening that is in communication with a feed inlet of the impeller shroud structure and one end of each medium channel, respectively; the feed inlet of the impeller shroud structure is sequentially provided with first protrusions in the circumferential direction; and a pump cavity in communication with the other end of each medium channel is further formed inside the impeller shroud structure. The present application achieves stable, continuous and leak-free safe transportation of a high-temperature and high-pressure solid, liquid and gas three-phase flow ore slurry medium by means of the combined action of multiple systems.

Description

Centrifugal type ore pulp preheater feeding pump and feeding pump system TECHNICAL FIELD

[0001] The present application relates to the technical field of ore pulp medium conveying, in particular to a centrifugal type ore pulp preheater feeding pump and feeding pump system. BACKGROUND

[0002] The high-temperature and high-pressure ore pulp preheater is a device for storing and heating high-pressure ore pulp. The ore pulp is a three-phase mixed slurry mainly composed of solid, liquid and gas. The solid content is generally 35% to 40%, and the rest is steam and acid-containing solution with a pH of 2 to 4. The preheater is a sealed cylindrical tank with pressure inside. As the temperature of the ore pulp rises from 105 DEG C to 165 DEG C, the pressure in the tank rises from 0.8 MPa to 2.2 MPa.

[0003] At present, the high-temperature and high-pressure ore pulp preheater feeding pump mostly adopts a high-pressure diaphragm pump, which is a positive displacement pump. Chinese patent CN105201847A discloses a diaphragm type oil-free vacuum pump. The pump realizes the suction and discharge functions by using the eccentric mechanism principle and is composed of a stator chamber, a pump chamber and a rotor penetrating the inner cavities of the two chambers. The stator chamber is fixed with a stator having an eccentric hole. The pump chamber is fixed on the stator chamber and coaxial with it. The inner cavity of the pump chamber is fixed with a tongue sleeve, and the tongue sleeve has a pair of tongues separating the high-pressure area and the low-pressure area in the pump chamber. The rotor has a C-shaped channel. A plunger is arranged in the radial through hole corresponding to the stator. The inner end of the plunger is sleeved with a flexible diaphragm sleeve, so that the lubricating oil in the stator chamber is absolutely isolated from the gas in the pump chamber.

[0004] The working principle of the pump is to change the volume of the working chamber by the back and forth driving of a diaphragm to suck and discharge liquid. However, the pump has the following disadvantages: the reciprocating movement of the pump will impact the preheater and the pipeline valves, and the medium conveying is discontinuous. In addition, the working part of the pump is mainly composed of a crank connecting rod mechanism, a plunger, a liquid cylinder, a diaphragm, a pump body, a suction valve and a discharge valve, resulting in a large volume and many fault points of the pump. Especially when conveying medium containing solid particles, the hard particles will severely wear the suction valve, valve seat and valve cone, and the discharge valve, valve seat and valve cone, resulting in pressure relief and insufficient flow.

[0005] SUMMARY

[0006] The present application aims to overcome the above technical deficiencies and provides a centrifugal type ore pulp preheater feeding pump and feeding pump system to solve the technical problems of severe wear, pressure relief and insufficient flow when conveying medium containing solid particles.

[0007] To achieve the above technical purpose, the present application adopts the following technical scheme:

[0008] In a first aspect, the application provides a centrifugal ore slurry preheater feeding pump, comprising a driving unit, a centrifugal unit and a sealing and cooling unit, the centrifugal unit comprising an impeller and a wheel cover structure, the impeller being rotationally arranged inside the wheel cover structure, a plurality of medium channels being formed in the wheel cover structure by a plurality of blades of the impeller, one side of the impeller being connected to the driving unit, the other side being provided with openings respectively communicating with a feeding port of the wheel cover structure and one end of the medium channels, the feeding port of the wheel cover structure being sequentially provided with first protrusions in the circumferential direction, and a pump cavity being further formed in the feeding port and communicating with the other end of the medium channels; the sealing and cooling unit comprising a sealing system and a sealing body arranged between a rotor and a stator, a sealing cavity being formed between friction surfaces in the sealing body and communicating with a discharge port of the sealing system, so as to ensure that the medium does not leak out under the operating state of the centrifugal pump.

[0009] In some embodiments, a second protrusion is arranged on the side of the impeller away from the feeding port of the wheel cover structure, a cavity is arranged in the second protrusion, the inner wall of the cavity is provided with threads, and the threads are connected to the driving unit, and the outer side of the impeller is sequentially provided with five blades curved and extending outward in the circumferential direction.

[0010] In some embodiments, the wheel cover structure comprises a volute, a shield and a pump cover, one end of the volute forms an annular feeding portion, the first protrusions are arranged on the inner side of the annular feeding portion, the other end of the volute surrounds the impeller and is sequentially connected to the shield and the pump cover, so that the impeller is located in the pump cavity formed by the volute, the shield and the pump cover. The connection between the volute and the shield is sealed by a C-shaped ring arranged therebetween, the C-shaped ring is sequentially arranged along the connection between the volute and the shield, two protrusions of the C-shaped ring are connected to the volute and the shield respectively, and a plurality of fixing ribs are uniformly distributed on the side of the C-shaped ring away from the volute in the circumferential direction, so as to ensure the sealing performance and strength of the sealing member.

[0011] In some embodiments, the sealing system comprises a heat exchanger, a forced circulation pump, an accumulator and a liquid supplement station, the liquid inlet end of the heat exchanger is connected to the liquid discharge port of the sealing cavity through the accumulator, the liquid outlet end is connected to the liquid inlet port of the sealing cavity through the forced circulation pump, and the liquid supply end of the liquid supplement station is connected to the heat exchanger.

[0012] In some embodiments, the centrifugal ore slurry preheater feeding pump further comprises a linking unit connected to the driving end of the driving unit and the impeller, for transmitting rotational torque.

[0013] In some embodiments, the centrifugal slurry preheater feed pump further comprises a backstop transmission unit, the backstop transmission unit comprising a transmission unit and a backstop unit, the transmission unit connecting the driving end of the driving unit and the impeller, the backstop unit connecting the transmission unit to prevent reverse rotation of the transmission unit. The transmission unit comprises a rotating shaft, one end of the rotating shaft being connected to the driving end of the driving unit through a link unit, the other end of the rotating shaft being connected to the impeller; the backstop unit comprises a bearing seat, a wedge, a rotating pin, a spring, a shaft sleeve and a blocking arm, the shaft sleeve being sleeved on the outside of the rotating shaft, the bearing seat being sleeved on the outside of the shaft sleeve to form an annular cavity therebetween, the outside of the bearing seat being fixed to the base of the driving unit through the blocking arm, a plurality of rotating pins being uniformly arranged in the annular cavity in the circumferential direction, the rotating pins being rotatably connected to the bearing seat, the spring being arranged between adjacent two rotating pins, the wedge being sleeved on each rotating pin, the two ends of the wedge abutting against the outer surface of the bearing seat and the inner surface of the shaft sleeve respectively to lock the rotating shaft when the rotating shaft reverses.

[0014] Preferably, the backstop transmission unit is used to prevent the slurry in the pressurized preheater from returning to the inlet through the pipeline from the pump outlet to damage the rotor components when the centrifugal pump stops working under abnormal conditions. The backstop principle is similar to that of a ratchet wheel, which can only rotate in one direction and will be locked when it rotates in the opposite direction, thereby playing a backstop role.

[0015] In some embodiments, the centrifugal slurry preheater feed pump further comprises an adjustable support, the adjustable support comprising a support traction plate, an adjusting screw, a sliding block, a baffle, a sliding plate and a foundation bolt, the support traction plate and the baffle being fixedly connected to the base of the driving unit, the sliding plate being fixed to the bottom end of the baffle, the foundation bolt being movably connected to the sliding plate, the sliding block being sleeved on the foundation bolt, the adjusting screw being arranged in the axial direction of the driving unit and being threadedly connected to the support traction plate, one end of the adjusting screw being rotatably connected to the sliding plate to adjust the movement of the sliding plate in the direction parallel to the axis of the driving unit.

[0016] In a second aspect, the application further provides a feed pump system, comprising three centrifugal slurry preheater feed pumps as described in any one of the above embodiments, the three centrifugal slurry preheater feed pumps being connected in sequence.

[0017] Compared with the prior art, the centrifugal ore slurry preheater feeding pump and the feeding pump system provided by the application comprise three pumps connected in series to form a feeding pump system, and the centrifugal ore slurry preheater feeding pump comprises a driving unit, a centrifugal unit and a sealing cooling unit. The driving unit is used to realize the rotation of an impeller. In the implementation process, the first-stage pump impeller rotates under the driving of the driving unit, and the medium in the medium-temperature preheater is sucked into the feed inlet of the wheel cover structure through the negative pressure generated by the centrifugal force, and the medium is thrown into the pump cavity through the centrifugal force generated by the rotation of the blade, and then flows to the outlet of the wheel cover structure after being gathered in the pump cavity, and then enters the second-stage pump and then enters the third-stage pump, and finally is delivered into the high-temperature preheater. Each stage of the pump increases the pressure of the fluid, and the final output pressure is the sum of the pressures provided by the pumps, so that each pump bears the function of lifting the fluid pressure to ensure that the fluid can smoothly pass through the entire system and can withstand the operating conditions in the high-temperature and high-pressure environment, thereby realizing the safe delivery of the high-temperature and high-pressure solid, liquid and gas three-phase flow ore slurry medium in a stable, continuous and leakage-free manner. Meanwhile, the first protrusion is arranged at the feed inlet of the wheel cover structure, which can hinder the movement track of the solid particles, thereby reducing the wear of the pipe wall by the solid medium.

[0018] The sealing cooling unit is provided with a sealing cavity in communication with the outlet of the sealing system of the sealing body, and the sealing system of the sealing cooling unit can increase the heat exchange amount of the isolation liquid to ensure that the rotor component and the stator component do not leak during operation when the centrifugal pump delivers high-temperature medium. BRIEF DESCRIPTION OF DRAWINGS

[0019] FIG. 1 is a structure diagram of the constituent unit of the centrifugal ore slurry preheater feeding pump provided by the embodiment of the application;

[0020] FIG. 2 is a structure diagram of the whole centrifugal ore slurry preheater feeding pump provided by the embodiment of the application;

[0021] FIG. 3 is a structure diagram of the reverse stop transmission unit of the centrifugal ore slurry preheater feeding pump provided by the embodiment of the application;

[0022] FIG. 4 is a structure diagram of the front guard plate inlet of the centrifugal ore slurry preheater feeding pump provided by the embodiment of the application;

[0023] FIG. 5 is a structure diagram of the front guard plate inlet of the centrifugal ore slurry preheater feeding pump provided by the embodiment of the application;

[0024] FIG. 6 is a structure diagram of the C-shaped ring installation of the centrifugal ore slurry preheater feeding pump provided by the embodiment of the application;

[0025] FIG. 7 is a structure diagram of the C-shaped ring installation of the centrifugal ore slurry preheater feeding pump provided by the embodiment of the application;

[0026] Fig. 8 is a structural schematic diagram of an adjustable support of a centrifugal ore slurry preheater feed pump provided by an embodiment of the present application;

[0027] Fig. 9 is a schematic diagram of a mounting arrangement of a feed pump system provided by an embodiment of the present application;

[0028] Fig. 10 is a schematic diagram of a three-in-series structure of a centrifugal ore slurry preheater feed pump and a feed pump system provided by an embodiment of the present application.

[0029] Legend: 1, driving unit; 2, linking unit; 3, anti-return transmission unit; 31, anti-return unit; 311, bearing seat; 312, wedge block; 313, rotating pin; 314, spring; 315, shaft sleeve; 316, blocking arm; 32, transmission unit; 4, centrifugal unit; 41, flow passing unit; 411, impeller; 412, volute; 4121, first protrusion; 413, guard plate; 414, pump cover; 415, C-shaped ring; 416, fixing rib; 42, pressure bearing unit; 5, sealing and cooling unit; 51, sealing body; 52, sealing system; 521, heat exchanger; 522, forced circulation pump; 523, accumulator; 53, liquid supplement station; 6, adjustable support; 61, support traction plate; 62, adjusting screw; 621, first nut; 63, sliding block; 64, baffle; 65, sliding plate; 66, anchor bolt; 661, second nut; P1, first pressure transmitter; P2, second pressure transmitter; P3, third pressure transmitter; B1, first stage pump; B2, second stage pump; B3, third stage pump; G1, medium temperature preheater; D, anti-return valve; E, pipeline; G2, high temperature preheater. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0031] In order to solve the technical problems of severe wear, pressure relief and insufficient flow when conveying medium containing solid particles, the present application provides a centrifugal ore slurry preheater feed pump and a feed pump system, which realizes stable, continuous and leakage-free safe conveying of high-temperature and high-pressure solid, liquid and gas three-phase flow ore slurry medium through the joint action of multiple systems.

[0032] Please refer to Figs. 1 to 8, in the first aspect, the embodiments of the present application disclose a centrifugal ore slurry preheater feed pump, comprising: a driving unit 1, a linking unit 2, an anti-return transmission unit 3, a centrifugal unit 4, a sealing and cooling unit 5 and an adjustable support 6.

[0033] The centrifugal unit 4 comprises an impeller 411 rotatably arranged in a wheel cover structure, a plurality of medium channels are formed in the wheel cover structure by a plurality of blades of the impeller 411, one side of the impeller 411 is connected to the driving unit 1, and the other side is provided with openings respectively communicating with a feed inlet and one end of the medium channels of the wheel cover structure, the feed inlet of the wheel cover structure is sequentially provided with a first protrusion 4121 in the circumferential direction, which is used to reduce the wear of the pipe wall caused by the solid medium under the action of centrifugal force, and a pump cavity communicating with the other end of the medium channels is further formed in the wheel cover structure; the sealing and cooling unit 5 comprises a sealing system 52 and a sealing body 51 arranged between the rotor and the stator, and a sealing cavity is formed between the friction surfaces in the sealing body 51 and communicates with the outlet of the sealing system 52.

[0034] In the scheme, by arranging the driving unit 1, the centrifugal unit 4 and the sealing and cooling unit 5, the medium enters the opening at the one side of the impeller 411 through the feed inlet of the wheel cover structure, and then flows to the medium channel of each blade through the opening, the impeller 411 of the centrifugal unit 4 is connected to the driving unit 1, and is used to rotate in the wheel cover structure under the action of the driving force of the driving unit 1, the medium is thrown into the pump cavity formed in the wheel cover structure under the centrifugal force of the blades of the impeller 411, and finally flows out through the outlet, thereby realizing the conveying of the ore pulp medium; the first protrusion 4121 arranged at the feed inlet of the wheel cover structure can hinder the movement track of the solid particles, thereby reducing the wear of the pipe wall caused by the solid medium; the sealing cavity is formed between the friction surfaces in the sealing body 51 and communicates with the outlet of the sealing system 52, and the lubrication and cooling of the friction surfaces can be realized by the isolation liquid, the sealing system 52 of the sealing and cooling unit 5 can increase the heat exchange amount of the isolation liquid, and the rotation between the rotor component and the stator component of the centrifugal pump can be ensured without leakage during the conveying of the high-temperature medium.

[0035] Preferably, in the embodiment, the driving unit 1 is an electric motor, which can provide a rotating driving force and provide power for the whole system. The bottom of the electric motor is provided with a base, which is used to install the driving unit 1, the linking unit 2 and the non-return transmission unit 3.

[0036] Of course, in order to transmit the driving force of the electric motor, the linking unit 2 is a rigid coupling in the embodiment, which is connected to the driving unit 1 and the centrifugal unit 4 respectively, and is used to transmit the rotating torque.

[0037] It should be noted that in other possible embodiments, the driving unit 1 can also be a diesel engine or the like driving member, and the linking unit 2 can also be a belt assembly, which is composed of a belt and a belt pulley, and the belt pulley is used to connect each component, and the belt is sleeved between the belt pulleys to transmit the rotating torque.

[0038] Preferably, in the present embodiment, please refer to FIG. 2 and FIG. 3, the backstop unit 3 is composed of a transmission unit 32 and a backstop unit 31, the transmission unit 32 is used to connect the driving end of the driving unit 1 and the impeller 411, the backstop unit 31 is connected to the transmission unit 32, which functions to prevent the reverse rotation of the rotor (impeller 411) of the centrifugal unit 4, thereby preventing the mechanical friction damage caused by the loosening of the impeller 411 due to reverse rotation.

[0039] In one embodiment, the transmission unit 32 includes a rotating shaft, and the backstop unit 31 includes a bearing seat 311, a wedge block 312, a rotating pin 313, a spring 314, a shaft sleeve 315, and a blocking arm 316.

[0040] Specifically, one end of the rotating shaft is connected to the driving shaft of the motor through a shaft coupling, and the other end of the rotating shaft is connected to the impeller 411. The shaft sleeve 315 is sleeved on the outside of the rotating shaft and is connected to the rotating shaft through a key groove, and can rotate with the rotating shaft. The bearing seat 311 is sleeved on the outside of the shaft sleeve 315, and an annular cavity is formed between the bearing seat 311 and the shaft sleeve 315. The outside of the bearing seat 311 is fixed to the base of the driving unit 1 through the blocking arm 316, wherein the bearing seat 311 and the blocking arm 316 are integrated and connected to the base to form a stationary part. A plurality of rotating pins 313 are uniformly arranged in the circumferential direction in the annular cavity. The end of the rotating pin 313 is connected to the bearing seat 311 for rotation. The spring 314 is installed between two adjacent rotating pins 313. The wedge block 312 is sleeved on each rotating pin 313. The two ends of the wedge block 312 abut against the outer side surface of the bearing seat 311 and the inner side surface of the shaft sleeve 315, respectively. The plurality of wedge blocks 312 are arranged radially in the annular cavity and are inclined in the direction opposite to the rotation direction of the rotating shaft. In the present solution, the rotating shaft rotates counterclockwise in normal operation, so that each wedge block 312 is inclined clockwise at the reference point aligned with the radius of the bearing seat 311. The wedge block 312 can lock the rotating shaft when the rotating shaft reverses.

[0041] When the shaft sleeve 315 rotates counterclockwise, the inside of the wedge block 312 is offset by friction with the shaft sleeve 315, so that the outside of the wedge block 312 forms a small gap with the bearing seat 311, thereby normally operating; when the shaft sleeve 315 rotates clockwise, the wedge block 312 is offset and locked between the shaft sleeve 315 and the bearing seat 311 by friction and the joint action of the spring 314, and the force on the bearing seat 311 is transmitted to the base through the blocking arm 316, thereby forming a check. The check drive unit 3 is used to prevent damage to the rotor caused by the return of the mineral slurry in the pressure preheater from the pump outlet to the inlet through the pipeline when the centrifugal pump stops working abnormally. The principle of the check is similar to that of the ratchet, which can only rotate in one direction and will be locked when rotating in the opposite direction, thereby playing a check role.

[0042] In order to realize the connection between the impeller 411 and the shaft, in the embodiment, referring to FIG. 2, the side of the impeller 411 away from the feed inlet of the wheel cover structure is provided with a cylindrical second protrusion, the inside of the second protrusion is provided with a cavity, the inner diameter of the cavity matches the outer diameter of the shaft, and the inner wall of the cavity is provided with threads, which are connected with the shaft of the check drive unit 3 through threads, and the shaft is connected with the motor through a shaft coupling.

[0043] Further, the outside of the impeller 411 is sequentially provided with five blades curved and extended to the outside in the circumferential direction, the impeller 411 is in a disc structure, and the five scattered space twisted blades are clamped between the front and rear annular cover plates to form a disc structure with five channels in the radial direction, and the cylinder of the impeller 411 inlet is connected with the five channels, and the medium enters the five channels through the inlet.

[0044] It should be noted that in other embodiments, the number of blades of the impeller 411 is not limited, and can be more than five.

[0045] Preferably, in the embodiment, referring to FIG. 2, the centrifugal unit 4 further comprises a pressure bearing unit 42, which comprises two front and rear pump housings, for realizing the packaging of the impeller 411 and the wheel cover structure, the impeller 411 and the wheel cover structure form a flow unit 41, the wheel cover structure comprises a volute 412, a guard plate 413 and a pump cover 414, one end of the volute 412 forms an annular feed part, the first protrusion 4121 is arranged on the inside of the annular feed part, the other end of the volute 412 surrounds the impeller 411 in sequence and is connected with the guard plate 413 and the pump cover 414, so that the impeller 411 is in the pump cavity formed by the volute 412, the guard plate 413 and the pump cover 414. The flow unit 41 adopts a wear-resistant and corrosion-resistant high-hardness material, and the pressure bearing unit 42 adopts a high-strength ductile iron material, and the two jointly act to ensure the service life of the centrifugal unit 4.

[0046] In the implementation, the motor rotates to transmit torque to the impeller 411 to make rotational movement, and the medium is thrown into the pump cavity formed by the volute 412 and the front and rear shrouds 413 and the pump cover 414 under the centrifugal force of the blades of the impeller 411, and finally flows out through the outlet of the volute 412.

[0047] Preferably, in the embodiment, referring to FIG. 5, the first protrusions 4121 are in a scattered shape, which aims to reduce the wear of the pipe wall by the solid medium under the centrifugal force. The principle is as follows: the medium flows in the cylindrical pipe, and is driven to make rotational movement inside the pipe wall under the rotational action of the impeller 411 when being sucked into the pump inlet. Since the solid particles are ores and have a specific gravity greater than water, their running tracks are attached to the inner side of the pipe wall, thereby causing wear of the pipe wall. The protrusions inside the pipe wall along the axial direction at the inlet of the volute 412 can hinder the running tracks of the solid particles, thereby reducing the wear of the pipe wall by the solid medium.

[0048] Preferably, in the embodiment, referring to FIGS. 6 and 7, the centrifugal unit 4 is in a relatively closed cavity formed by the volute 412, the front and rear shrouds 413, and the pump cover 414. To ensure the installation and sealing of the parts, a C-shaped ring 415 structure is particularly used, which is arranged along the connection between the volute 412 and the shroud 413 in sequence, and two protrusions of the C-shaped ring 415 are connected with the volute 412 and the shroud 413 respectively, so that the two protrusions of the C-shaped structure are sealed with the volute 412 and the shroud 413 respectively, thereby ensuring that the high-pressure cavity does not leak. In addition, to eliminate thermal expansion and contraction of the metal material during temperature change, a certain gap δ is particularly left between the shroud 413 and the volute 412, and the size of the gap δ is 0.01% to 0.02% of the maximum outer diameter of the shroud 413.

[0049] Further, the side of the C-shaped ring 415 away from the volute 412 is uniformly distributed with a plurality of fixing ribs 416 in the circumferential direction, and the fixing ribs 416 are in a scattered shape, thereby ensuring the sealing property and strength of the sealing member.

[0050] Preferably, in the embodiment, referring to FIG. 2, the sealing system 52 includes a heat exchanger 521, a forced circulation pump 522, an accumulator 523, and a liquid supplement station 53. The liquid inlet end of the heat exchanger 521 is connected with the liquid outlet of the sealing cavity through the accumulator 523, the liquid outlet end is connected with the liquid inlet of the sealing cavity through the forced circulation pump 522, and the liquid supply end of the liquid supplement station 53 is connected with the heat exchanger 521. The outlet of the pressure-bearing unit 42 is provided with a third pressure transmitter P3, the accumulator 523 is provided with a second pressure transmitter P2, and the liquid supplement station 53 is provided with a first pressure transmitter P1.

[0051] The liquid supplement station 53 provides the isolation liquid for the whole system, the sealing system 52 realizes the circulation cooling of the isolation liquid, and the sealing body 51 is installed on the centrifugal unit 4 to ensure that the medium does not leak under the running state of the centrifugal pump.

[0052] In the implementation, the forced circulation pump 522 increases the heat exchange amount of the isolation liquid, and ensures that the centrifugal pump does not leak between the rotor part and the stator part during the transportation of the high-temperature medium. The sealing body 51 is installed between the pump rotor part and the stator part, and actually installed between the rotating shaft and the pump cover 414. The sealing cavity of the sealing body 51 is communicated with the isolation liquid from the sealing system 52 to provide lubrication for the friction surface. The isolation liquid of the sealing system 52 is supplied by the liquid supplement station 53. The sealing system 52 is provided with a pressure sensor, which can feedback the pressure value of the isolation liquid in the sealing cavity at any time, and the pump outlet pressure transmitter timely feedbacks the pump outlet pressure value. Through the interlocking relationship, the pressure value of the isolation liquid in the sealing cavity is kept greater than the pump outlet pressure value by 0.3 MPa at any time, thereby ensuring that the mechanical seal is well lubricated.

[0053] The impeller 411 is installed on the transmission unit 32, and an axial adjustment mechanism is designed between the transmission unit 32 and the stator to realize the axial relative movement of the two, so as to ensure that the gap γ between the impeller 411 and the front baffle 413 is 0.5 mm. The gap ensures that the rotor part flows smoothly while minimizing the flow of the medium back from the volute 412 cavity to the pump inlet, thereby realizing the high-efficiency operation of the centrifugal pump. In this embodiment, please refer to FIG. 2 and FIG. 8, the axial adjustment mechanism is an adjustable support 6, which includes a support traction plate 61, an adjusting screw 62, a sliding block 63, a baffle 64, a sliding plate 65 and a foundation bolt 66.

[0054] Specifically, the support traction plate 61 and the baffle 64 are integrally welded with the base and installed with the pump as a whole, the sliding plate 65 is fixed at the bottom end of the baffle 64, the foundation bolt 66 is movably connected with the sliding plate 65 and can slide on the sliding plate 65 and the baffle 64 in the axial direction of the pump, the sliding block 63 is sleeved on the foundation bolt 66, the foundation bolt 66 is fixed in the foundation, and the adjusting screw 62 extends along the axial direction of the driving unit 1 and is threadedly connected with the support traction plate 61, and one end thereof is rotationally connected with the sliding plate 65 to adjust the movement of the sliding plate 65 in the direction parallel to the axis of the driving unit 1.

[0055] When the pump is installed and pressed, the whole needs to be moved axially. At this time, by adjusting the adjusting screw 62, the distance between the sliding block 63 and the support traction plate 61 is increased, so that the pump group is axially moved relative to the foundation bolt 66 by a certain displacement. In particular, the baffle 64 prevents the sliding block 63 from being radially offset during movement; the contact surfaces of the sliding plate 65 and the baffle 64 are very smooth, reducing the friction during movement.

[0056] Further, the end of the adjusting screw 62 is threadedly connected with a first nut 621, and the position locking of the adjusting screw 62 and the support traction plate 61 is realized through the first nut 621; the top end of the foundation bolt 66 is threadedly connected with a second nut 661, and the second nut 661 is tightened and locked after the position adjustment, so as to prevent the secondary axial movement; the adjustable support 6 realizes the axial displacement of the whole single-set equipment through the adjusting top screw and the limiting nut, and ensures the compression of the sealing gasket when the three sets of equipment are installed in series.

[0057] Please refer to FIG. 9 and FIG. 10, in the second aspect, the embodiment of the present application further provides a feeding pump system, which comprises three centrifugal ore slurry preheater feeding pumps as described in any one of the above embodiments, and the three centrifugal ore slurry preheater feeding pumps are connected in series.

[0058] In order to facilitate the introduction, the three centrifugal ore slurry preheater feeding pumps are defined as a first-stage pump B1, a second-stage pump B2 and a third-stage pump B3 respectively. In some embodiments, the feeding pump system further comprises a medium-temperature preheater G1, a check valve D, a pipeline E and a high-temperature preheater G2. Each preheater and the pump are connected through the pipeline.

[0059] Specifically, the medium-temperature preheater G1 is a cylindrical sealing container with a dome, the internal pressure is about 0.8 MPa, and the acid-containing slurry with a temperature of 105℃ and a solid content of 30% to 45% is stored in the container. In the implementation, the medium in the container needs to be delivered to the high-temperature preheater G2. Similarly, the high-temperature preheater G2 is a cylindrical sealing container with a dome, and the internal pressure is about 2 MPa. The present application adopts three high-temperature and high-pressure ore slurry preheater feeding pumps connected in series, and the advantages are that the flow rate is the same as that of a single pump, and the head is the superposition of three pumps, which solves the problem that only high-pressure ore slurry can be delivered into the preheater. In particular, the third-stage pump outlet is provided with a check valve to prevent the backflow of the high-temperature preheater G2 under abnormal conditions.

[0060] In the implementation, the medium of the medium-temperature preheater G1 is sucked from the inlet of the first-stage pump B1, passes through the second-stage pump B2, and is finally discharged from the outlet of the third-stage pump B3 to the high-temperature preheater G2.

[0061] The application is composed of a feeding pump system through three pumps in series, the centrifugal slurry preheater feeding pump is composed of a driving unit 1, a centrifugal unit 4 and a sealing cooling unit 5, the driving unit 1 is used for realizing the rotation of the impeller 411, in the implementation process, the first stage pump impeller 411 rotates under the driving of the driving unit 1, the medium in the medium temperature preheater is sucked into the feed inlet of the wheel cover structure through the negative pressure generated by the centrifugal force, the medium is thrown to the pump cavity through the centrifugal force generated by the blade rotation, and then flows to the wheel cover structure outlet, and then enters the second stage pump, and then enters the third stage pump, and finally is delivered to the high temperature preheater, wherein the pressure of the fluid is increased by each stage pump, and the finally output pressure is the sum of the pressures provided by the pumps, so that each pump bears the function of lifting the fluid pressure, to ensure that the fluid can smoothly pass through the whole system, and can withstand the operating conditions under high temperature and high pressure environment, so as to realize the safe delivery of the high temperature and high pressure solid, liquid and gas three-phase flow slurry medium stably, continuously and without leakage; meanwhile, the first protrusion 4121 is arranged at the feed inlet of the wheel cover structure, which can hinder the movement track of the solid particles, thereby reducing the wear of the pipe wall by the solid medium.

[0062] The sealing cooling unit 5 is arranged, the friction surfaces in the sealing body 51 are communicated with the sealing cavity of the sealing system 52, the sealing system 52 can increase the heat exchange amount of the isolation liquid, and the rotation between the rotor part and the stator part of the centrifugal pump is leakage-free during the delivery of the high temperature medium.

[0063] In the description of the application, it should be noted that the positions or position relationships indicated by the terms "upper" and "lower" are based on the positions or position relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the application. Unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0064] It should be noted that, in the present application, the relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0065] The specific embodiments of the present application described above are not meant to be limiting. Various other changes and modifications to the present application can be made based on the teachings of the present application without departing from the scope of the present application.

Claims

1. A centrifugal feed pump for a centrifugal ore slurry preheater, characterized in that, Comprise: a driving unit; a centrifugal unit comprising an impeller and a wheel cover structure, the impeller being rotationally arranged inside the wheel cover structure, a plurality of medium channels being formed in the wheel cover structure by a plurality of blades of the impeller, one side of the impeller being connected to the driving unit, the other side being provided with openings respectively communicating with a feed inlet of the wheel cover structure and one end of the medium channels, the feed inlet of the wheel cover structure being sequentially provided with a first protrusion in the circumferential direction, and a pump cavity being further formed in the inside of the first protrusion and communicating with the other end of the medium channels; and a sealing and cooling unit comprising a sealing system and a sealing body arranged between a rotor and a stator, a sealing cavity being formed between friction surfaces in the inside of the sealing body and communicating with an outlet of the sealing system.

2. The centrifugal feed pump for a slurry preheater according to claim 1, characterized in that, The other side of the impeller away from the feed inlet of the wheel cover structure is provided with a second protrusion, a cavity being arranged in the inside of the second protrusion, the inner wall of the cavity being provided with threads and being connected to the driving unit through the threads, and five blades being sequentially arranged on the outer side of the impeller in the circumferential direction and extending to the outside.

3. The centrifugal feed pump for a slurry preheater according to claim 1, characterized in that, The wheel cover structure comprises a volute, a shield and a pump cover, one end of the volute forming an annular feed portion, the first protrusion being arranged on the inner side of the annular feed portion, the other end of the volute surrounding the impeller and sequentially connecting the shield and the pump cover, so that the impeller is located in the pump cavity formed by the volute, the shield and the pump cover.

4. The centrifugal feed pump for a slurry preheater according to claim 3, characterized in that, The connection between the volute and the shield is sealed by a C-shaped ring, the C-shaped ring being sequentially arranged along the connection between the volute and the shield, two protrusions of the C-shaped ring being connected to the volute and the shield respectively, and a plurality of fixing ribs being uniformly distributed in the circumferential direction on the side of the C-shaped ring away from the volute.

5. The centrifugal feed pump for a slurry preheater according to claim 1, characterized in that, The sealing system comprises a heat exchanger, a forced circulation pump, an accumulator and a liquid supplement station, the liquid inlet end of the heat exchanger being connected to the liquid outlet of the sealing cavity through the accumulator, the liquid outlet end of the heat exchanger being connected to the liquid inlet of the sealing cavity through the forced circulation pump, and the liquid supply end of the liquid supplement station being connected to the heat exchanger.

6. The centrifugal feed pump for a slurry preheater according to claim 1, characterized in that, The centrifugal slurry preheater feed pump further comprises a linking unit, the linking unit being connected to the driving end of the driving unit and the impeller for transmitting rotational torque.

7. A centrifugal feed pump for a slurry preheater according to claim 6, characterized in that The centrifugal slurry preheater feed pump further comprises a backstop transmission unit, the backstop transmission unit comprising a transmission unit and a backstop unit, the transmission unit being connected to the driving end of the driving unit and the impeller, and the backstop unit being connected to the transmission unit for preventing the transmission unit from rotating reversely.

8. The centrifugal feed pump for a slurry preheater according to claim 7, characterized in that, The transmission unit comprises a rotating shaft, one end of the rotating shaft being connected to the driving end of the driving unit through the linking unit, and the other end of the rotating shaft being connected to the impeller. The reverse unit comprises a bearing seat, a wedge block, a rotating pin, a spring, a shaft sleeve and a blocking arm, the shaft sleeve is sleeved outside the rotating shaft, the bearing seat is sleeved outside the shaft sleeve, an annular cavity is formed between the shaft sleeve and the bearing seat, the outer side of the bearing seat is fixed on the base of the driving unit through the blocking arm, a plurality of rotating pins are uniformly arranged in the annular cavity in the circumferential direction, the rotating pins are rotationally connected with the bearing seat, the spring is arranged between two adjacent rotating pins, the wedge block is sleeved on each rotating pin, and the two ends of the wedge block abut against the outer surface of the bearing seat and the inner surface of the shaft sleeve respectively, so as to abut and lock the rotating shaft when the rotating shaft is reversed.

9. The centrifugal feed pump for a slurry preheater according to claim 1, characterized in that, The centrifugal ore slurry preheater feeding pump further comprises an adjustable support, the adjustable support comprises a support traction plate, an adjusting screw, a sliding block, a baffle, a sliding plate and an anchor bolt, The support traction plate and the baffle are fixedly connected with the base of the driving unit, the sliding plate is fixed at the bottom end of the baffle, the anchor bolt is movably connected with the sliding plate, the sliding block is sleeved on the anchor bolt, the adjusting screw is arranged in the axial direction of the driving unit and is threadedly connected with the support traction plate, and one end of the adjusting screw is rotationally connected with the sliding plate, so as to adjust the movement of the sliding plate in the direction parallel to the axis of the driving unit.

10. A dosing pump system characterized by, The centrifugal ore slurry preheater feeding pump comprises three centrifugal ore slurry preheater feeding pumps which are sequentially connected.

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