Centrifugal feed pump for a centrifugal ore slurry preheater and feed pump system

Abstract

The application discloses a centrifugal type ore pulp preheater feeding pump and a feeding pump system. The centrifugal type ore pulp preheater feeding pump comprises a driving unit, a centrifugal unit and a sealing and cooling unit. The centrifugal unit comprises an impeller and a wheel cover structure. The impeller is rotatably arranged in the wheel cover structure. A plurality of medium channels are formed in the wheel cover structure through a plurality of blades of the impeller. One side of the impeller is connected with the driving unit. The other side of the impeller is provided with an opening which is connected with a feeding port of the wheel cover structure and one end of the medium channels. The feeding port of the wheel cover structure is sequentially provided with a first protrusion in the circumferential direction. A pump cavity which is connected with the other end of the medium channels is further formed in the feeding port. The application realizes the safe conveying of high-temperature and high-pressure solid, liquid and gas three-phase flow ore pulp medium in a stable, continuous and leakage-free manner through the cooperation of multiple systems.

Description

Technical Field

[0001] This application relates to the field of slurry media conveying technology, specifically to a centrifugal slurry preheater feed pump and feed pump system. Background Technology

[0002] A high-temperature, high-pressure slurry preheater is a device used to store and heat high-pressure slurry. The slurry is mostly a three-phase mixture of solids, liquids, and gases, with a solid content generally between 35% and 40%, and the remainder being steam and acidic solutions, with a pH between 2 and 4. The preheater is usually a sealed cylindrical tank, which is pressurized internally. As the slurry temperature rises from 105℃ to 165℃, the pressure inside the tank correspondingly increases from 0.8MPa to 2.2MPa.

[0003] Currently, most feed pumps for high-temperature and high-pressure slurry preheaters use high-pressure diaphragm pumps, which are positive displacement pumps. Chinese patent CN105201847A discloses a diaphragm-type oil-free vacuum pump that utilizes the principle of an eccentric mechanism to achieve the pump's suction and discharge functions. It consists of a stator chamber, a pump chamber, and a rotor that penetrates the cavities of the two chambers. A stator with an eccentric hole is fixedly installed in the stator chamber. The pump chamber is fixedly installed on the stator chamber and coaxial with it. A tongue sleeve is fixedly installed in the inner cavity of the pump chamber. The tongue sleeve has a pair of tongues that separate the high-pressure zone and the low-pressure zone in the pump chamber. The rotor has a C-shaped channel. A plunger is installed in the radial through hole corresponding to the stator. An elastic diaphragm sleeve is fitted on the inner end of the plunger to completely isolate the lubricating oil in the stator chamber from the gas in the pump chamber.

[0004] Its working principle relies on the back-and-forth movement of a diaphragm to change the volume of the working chamber, thereby drawing in and discharging liquid. However, it has the following disadvantages: the reciprocating motion of the pump will impact the preheater and pipeline valves, and the medium delivery is discontinuous. In addition, its working parts are mainly composed of crank connecting rod mechanism, plunger, liquid cylinder, diaphragm, pump body, suction valve and discharge valve, etc., resulting in a large size and many failure points in the complex system. Especially when conveying media containing solid particles, the harder particles will cause severe wear on the suction valve, valve seat, valve cone and discharge valve, valve seat, valve cone, resulting in defects such as pressure leakage and insufficient flow. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a centrifugal slurry preheater feed pump and feed pump system to solve the technical problems of severe pump wear, pressure relief and insufficient flow when conveying media containing solid particles in the prior art.

[0006] To achieve the above-mentioned technical objectives, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a centrifugal slurry preheater feed pump, comprising: a drive unit, a centrifugal unit, and a sealing and cooling unit. The centrifugal unit includes an impeller and a wheel cover structure. The impeller is rotatably disposed inside the wheel cover structure. Several medium channels are formed inside the wheel cover structure by several blades of the impeller. One side of the impeller is connected to the drive unit, and the other side is provided with an inlet that connects to the wheel cover structure and an opening that connects to one end of the medium channel. The inlet of the wheel cover structure is provided with a first protrusion in sequence along the circumference, and a pump chamber that connects to the other end of the medium channel is also formed inside it. The sealing and cooling unit includes a sealing system and a sealing body disposed between the rotor and the stator. A sealing cavity that connects to the isolation liquid outlet of the sealing system is formed between the friction surfaces inside the sealing body to ensure that there is no external leakage of the medium during the operation of the centrifugal pump.

[0008] In some embodiments, a second protrusion is provided on the side of the impeller away from the feed inlet of the wheel cover structure. The second protrusion has a cavity inside, and the inner wall of the cavity is threaded and connected to the drive unit through the thread. Five blades extending outward are arranged in sequence along the circumferential direction on the outer side of the impeller.

[0009] In some embodiments, the impeller cover structure includes a volute, a protective plate, and a pump cover. One end of the volute forms an annular feed portion, and the first protrusion is disposed inside the annular feed portion. The other end of the volute surrounds the impeller and is sequentially connected to the protective plate and the pump cover, so that the impeller is located within the pump cavity formed by the volute, the protective plate, and the pump cover. The connection between the volute and the protective plate is sealed by a C-ring. The C-rings are arranged sequentially along the connection between the volute and the protective plate. The two protrusions of the C-rings are respectively connected to the volute and the protective plate. Multiple fixing ribs are evenly distributed along the circumference on the side of the C-ring facing away from the volute, ensuring the sealing performance and strength of the seal.

[0010] In some embodiments, the sealing system includes a heat exchanger, a forced circulation pump, an accumulator, and a replenishment station. The inlet of the heat exchanger is connected to the outlet of the sealing cavity through the accumulator, and its outlet is connected to the inlet of the sealing cavity through the forced circulation pump. The supply end of the replenishment station is connected to the heat exchanger.

[0011] In some embodiments, the centrifugal slurry preheater feed pump further includes a linking unit that connects the drive end of the drive unit and the impeller for transmitting rotational torque.

[0012] In some embodiments, the centrifugal slurry preheater feed pump further includes a backstop drive unit, which includes a drive unit and a backstop unit. The drive unit is connected to the drive end of the drive unit and the impeller, and the backstop unit is connected to the drive unit to prevent the drive unit from rotating in the opposite direction. The transmission unit includes a rotating shaft, one end of which is connected to the drive end of the drive unit via a link unit, and the other end of which is connected to the impeller. The backstop unit includes a bearing housing, a wedge, a rotating pin, a spring, a bushing, and a stop arm. The bushing is fitted on the outside of the rotating shaft, and the bearing housing is fitted on the outside of the bushing, forming an annular cavity between them. The outside of the bearing housing is fixed to the base of the drive unit via the stop arm. Multiple rotating pins are evenly arranged circumferentially within the annular cavity. The rotating pins are rotatably connected to the bearing housing. The spring is installed between two adjacent rotating pins. Each rotating pin is fitted with a wedge, and the two ends of the wedge abut against the outer surface of the bearing housing and the inner surface of the bushing, respectively, to lock the rotating shaft when it reverses direction.

[0013] Preferably, the backstop unit is used to prevent slurry in the pressurized preheater from returning through the pipeline from the pump outlet to the inlet and causing damage to the rotor components when the centrifugal pump stops working under abnormal conditions. The backstop works on a similar principle to a ratchet, and can only rotate in one direction. When it rotates in the opposite direction, it will jam, thus playing a backstop role.

[0014] In some embodiments, the centrifugal slurry preheater feed pump further includes an adjustable support, which includes a support traction plate, an adjusting screw, a slider, a baffle, a sliding plate, and anchor bolts. The support traction plate and the baffle are fixedly connected to the base of the drive unit. The sliding plate is fixed to the bottom end of the baffle. The anchor bolts are movably connected to the sliding plate. The slider is sleeved on the anchor bolts. The adjusting screw extends along the axial direction of the drive unit, is threadedly connected to the support traction plate, and one end is rotatably connected to the sliding plate to adjust the movement of the sliding plate in a direction parallel to the axis of the drive unit.

[0015] Secondly, this application also provides a feed pump system, including a centrifugal slurry preheater feed pump as described in any of the above claims, wherein three centrifugal slurry preheater feed pumps are provided and connected in sequence.

[0016] Compared with the prior art, the centrifugal slurry preheater feed pump and feed pump system provided in this application consist of three pumps connected in series to form a feed pump system. The centrifugal slurry preheater feed pump is composed of a drive unit, a centrifugal unit, and a sealing and cooling unit. The drive unit is used to realize the rotation of the impeller. During implementation, the impeller of the first-stage pump rotates under the drive unit. The negative pressure generated by centrifugal force draws the medium in the medium-temperature preheater into the feed inlet of the impeller cover structure. The centrifugal force generated by the rotation of the blades throws the medium into the pump chamber. After accumulating in the pump chamber, it flows to the outlet of the impeller cover structure and then enters the second-stage pump. The fluid enters the third-stage pump and is finally delivered to the high-temperature preheater. Each stage of the pump increases the fluid pressure, and the final output pressure is the sum of the pressures provided by each pump. This ensures that each pump plays a role in increasing the fluid pressure, allowing the fluid to pass smoothly through the entire system and withstand the operating conditions under high temperature and high pressure. This enables the stable, continuous, leak-free, and safe transportation of high-temperature and high-pressure solid, liquid, and gas three-phase flow slurry media. At the same time, a first protrusion is set at the feed inlet of the wheel cover structure to impede the movement trajectory of solid particles, thereby reducing the wear of the solid medium on the pipe wall.

[0017] Through the set sealing and cooling unit, a sealing cavity is formed between the friction surfaces inside the sealing body, which is connected to the isolation liquid outlet of the sealing system. The friction surfaces can be lubricated and cooled by the isolation liquid. The sealing system of the sealing and cooling unit can increase the heat exchange of the isolation liquid, ensuring that there is no leakage between the rotor and stator components during the transportation of high-temperature media by the centrifugal pump. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structural components of the centrifugal slurry preheater feed pump provided in the embodiments of this application;

[0019] Figure 2 This is a schematic diagram of the overall structure of the centrifugal slurry preheater feed pump provided in the embodiments of this application;

[0020] Figure 3 This is a schematic diagram of the backstop transmission unit of the centrifugal slurry preheater feed pump provided in the embodiments of this application;

[0021] Figure 4 This is a front view structural diagram of the inlet of the feed pump of the centrifugal slurry preheater provided in the embodiments of this application;

[0022] Figure 5 This is a schematic diagram of the inlet side view of the front guard plate of the feed pump for the centrifugal slurry preheater provided in the embodiments of this application;

[0023] Figure 6 This is a front view schematic diagram of the C-ring installation of the centrifugal slurry preheater feed pump provided in the embodiment of this application;

[0024] Figure 7 This is a side view of the C-ring installation of the centrifugal slurry preheater feed pump provided in the embodiments of this application;

[0025] Figure 8 This is a schematic diagram of the adjustable support for the centrifugal slurry preheater feed pump provided in the embodiments of this application;

[0026] Figure 9 This is a schematic diagram of the installation layout of the feed pump system provided in the embodiments of this application;

[0027] Figure 10 This is a schematic diagram of a three-unit series structure of a centrifugal slurry preheater feed pump and feed pump system provided in the embodiments of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Drive unit;

[0030] 2. Link unit;

[0031] 3. Backstop transmission unit; 31. Backstop unit; 311. Bearing housing; 312. Wedge block; 313. Rotating pin; 314. Spring; 315. Bushing; 316. Stop arm; 32. Transmission unit;

[0032] 4. Centrifugal unit; 41. Flow unit; 411. Impeller; 412. Volute; 4121. First protrusion; 413. Protective plate; 414. Pump cover; 415. C-ring; 416. Fixing rib; 42. Pressure bearing unit;

[0033] 5. Sealed cooling unit; 51. Sealed body; 52. Sealing system; 521. Heat exchanger; 522. Forced circulation pump; 523. Accumulator; 53. Liquid replenishment station;

[0034] 6. Adjustable support; 61. Support traction plate; 62. Adjusting screw; 621. First nut; 63. Sliding block; 64. Baffle; 65. Slide plate; 66. Anchor bolt; 661. Second nut;

[0035] 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, Check valve; E, Piping; G2, High temperature preheater. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] To address the technical problems of severe pump wear, insufficient pressure relief, and insufficient flow when conveying media containing solid particles, this application provides a centrifugal slurry preheater feed pump and feed pump system. By employing the combined action of multiple systems, it achieves stable, continuous, leak-free, and safe conveying of high-temperature, high-pressure, solid, liquid, and gaseous three-phase slurry media.

[0038] Please see Figures 1 to 8 In a first aspect, embodiments of this application disclose a centrifugal slurry preheater feed pump, comprising: a drive unit 1, a link unit 2, a backstop transmission unit 3, a centrifugal unit 4, a sealing and cooling unit 5, and an adjustable support 6.

[0039] The centrifugal unit 4 includes an impeller 411 and a wheel cover structure. The impeller 411 is rotatably disposed inside the wheel cover structure. Several media channels are formed inside the wheel cover structure through several blades of the impeller 411. One side of the impeller 411 is connected to the drive unit 1, and the other side is provided with an inlet that connects to the wheel cover structure and an opening that connects to one end of the media channel. The inlet of the wheel cover structure is provided with a first protrusion 4121 along the circumference, which is intended to reduce the wear of the solid medium on the pipe wall under the action of centrifugal force. A pump chamber that connects to the other end of the media channel is also formed inside the wheel cover structure. The sealing and cooling unit 5 includes a sealing system 52 and a sealing body 51 disposed between the rotor and the stator. A sealing cavity that connects to the isolation liquid outlet of the sealing system 52 is formed between the friction surfaces inside the sealing body 51.

[0040] In this scheme, by setting up a drive unit 1, a centrifugal unit 4, and a sealing and cooling unit 5, the medium enters the opening on one side of the impeller 411 through the feed port of the wheel cover structure, and flows through the opening to the medium channel of each blade. The impeller 411 of the centrifugal unit 4 is connected to the drive unit 1 and is used to rotate in the wheel cover structure under the driving force of the drive unit 1. The medium is thrown into the pump cavity formed inside the wheel cover structure under the centrifugal force of the impeller 411 blades, and finally flows out through the outlet to realize the transportation of slurry medium. A first protrusion 4121 is set at the feed port of the wheel cover structure, which can hinder the movement trajectory of solid particles, thereby reducing the wear of solid medium on the pipe wall. A sealing cavity is formed between the friction surfaces inside the sealing body 51, which is connected to the isolation liquid outlet of the sealing system 52. The isolation liquid can be used to lubricate and cool the friction surfaces. The sealing system 52 of the sealing and cooling unit 5 can increase the heat exchange of the isolation liquid and ensure that there is no leakage between the rotor and stator components during the transportation of high-temperature medium by the centrifugal pump.

[0041] Preferably, in this embodiment, the drive unit 1 is an electric motor, which provides rotational driving force to power the entire system. A base is provided at the bottom of the electric motor for mounting the drive unit 1, the link unit 2, and the reverse transmission unit 3.

[0042] Of course, in order to transmit the driving force of the motor, in this embodiment, the linking unit 2 is a rigid coupling, which connects the drive unit 1 and the centrifugal unit 4 respectively, and is used to transmit rotational torque.

[0043] It should be noted that in other possible embodiments, the drive unit 1 may also be a diesel engine or other drive component, and the link unit 2 may also be a belt assembly. The belt assembly consists of a belt and pulleys, which connect various components. The belt is sleeved between the pulleys to transmit rotational torque.

[0044] Preferably, in this embodiment, please refer to Figure 2 and Figure 3 The reverse transmission unit 3 consists of a transmission unit 32 and a reverse unit 31. The transmission unit 32 is used to connect the drive end of the drive unit 1 and the impeller 411. The reverse unit 31 is connected to the transmission unit 32. Its function is to prevent the rotor (impeller 411) of the centrifugal unit 4 from rotating in the opposite direction, thereby preventing mechanical friction damage caused by the impeller 411 becoming loose due to reverse rotation.

[0045] In one embodiment, the transmission unit 32 includes a rotating shaft, and the backstop unit 31 includes a bearing seat 311, a wedge 312, a rotating pin 313, a spring 314, a bushing 315, and a stop arm 316.

[0046] Specifically, one end of the rotating shaft is connected to the drive shaft of the motor via a coupling, and the other end of the rotating shaft is connected to the impeller 411. The bushing 315 is fitted onto the outside of the rotating shaft and is connected to the shaft via a keyway, allowing it to rotate with the shaft. The bearing seat 311 is fitted onto the outside of the bushing 315, forming an annular cavity with the bushing 315. The outside of the bearing seat 311 is fixed to the base of the drive unit 1 via the stop arm 316. The bearing seat 311 and the stop arm 316 are integral and connected to the base to form a stationary component. Multiple rotating pins 313 are evenly arranged circumferentially within the annular cavity. The ends of the rotating pins 313 are rotatably connected to the bearing seat 311. Two adjacent pins... The spring 314 is installed between the rotating pins 313. Each rotating pin 313 is fitted with a wedge 312. The two ends of the wedge 312 abut against the outer side of the bearing seat 311 and the inner side of the bushing 315, respectively. Multiple wedges 312 are arranged radially in the annular cavity and deflect in the opposite direction to the rotation direction of the shaft. In this design, the shaft moves normally when it rotates counterclockwise, so that each wedge 312 deflects clockwise at a reference aligned with the radius of the bearing seat 311. The wedge 312 can abut against and lock the shaft when it rotates counterclockwise.

[0047] When the bushing 315 rotates counterclockwise with the shaft, the inner side of the wedge 312 rubs against the bushing 315, causing an offset angle. This creates a small gap between the outer side of the wedge 312 and the bearing seat 311, allowing for normal operation. When the bushing 315 rotates clockwise, the wedge 312, under the combined action of friction and the spring 314, rubs against the bearing seat 311, causing an angular offset and locking between the bushing 315 and the bearing seat 311. The force on the bearing seat 311 is transmitted to the base through the stop arm 316, ultimately forming a backstop. The backstop transmission unit 3 is used to prevent damage to the rotor components caused by the slurry in the pressurized preheater returning from the pump outlet to the inlet through the pipeline when the centrifugal pump stops working under abnormal conditions. The backstop principle is similar to that of a ratchet; it can only rotate in one direction. When rotating in the opposite direction, it will lock, thus achieving a backstop function.

[0048] To achieve the connection between the impeller 411 and the shaft, please refer to the following embodiment: Figure 2 The impeller 411 has a cylindrical second protrusion on the side opposite to the feed port of the wheel cover structure. The second protrusion has a cavity inside, the inner diameter of which matches the outer diameter of the rotating shaft, and the inner wall of the cavity is threaded. It is connected to the rotating shaft of the reverse transmission unit 3 through the thread. The rotating shaft is connected to the motor through a coupling.

[0049] Furthermore, the impeller 411 has five outwardly curved blades arranged sequentially along the circumferential direction on its outer side. The impeller 411 has a disc structure, and the five scattering spatially twisted blades are sandwiched between the front and rear annular cover plates to form a disc structure with five radial channels. The cylindrical inlet of the impeller 411 is connected to the five channels, and the medium enters the five channels through the inlet.

[0050] It should be noted that in other embodiments, the number of blades of the impeller 411 is not limited, and may be more than 5.

[0051] Preferably, in this embodiment, please refer to Figure 2 The centrifugal unit 4 also includes a pressure-bearing unit 42, which comprises two pump casings, front and rear, for encapsulating the impeller 411 and the wheel cover structure. The impeller 411 and the wheel cover structure form the flow-through unit 41. The wheel cover structure includes a volute 412, a guard plate 413, and a pump cover 414. One end of the volute 412 forms an annular feed section, and the first protrusion 4121 is disposed inside the annular feed section. The other end of the volute 412 surrounds the impeller 411 and is sequentially connected to the guard plate 413 and the pump cover 414, so that the impeller 411 is located within the pump cavity formed by the volute 412, the guard plate 413, and the pump cover 414. The flow-through unit 41 is made of a wear-resistant, corrosion-resistant, and high-hardness material, while the pressure-bearing unit 42 is made of high-strength ductile iron. Together, they ensure the service life of the centrifugal unit 4.

[0052] During implementation, when the motor rotates, it transmits torque to the impeller 411 to make it rotate. Under the centrifugal force of the blades of the impeller 411, the medium is thrown into the pump chamber composed of the volute 412, the guard plate 413, and the pump cover 414, and finally flows out through the outlet of the volute 412.

[0053] Preferably, in this embodiment, please refer to Figure 5 The first protrusion 4121 is radiating in shape, its purpose being to reduce the wear of the solid medium on the pipe wall under centrifugal force. The principle is as follows: The medium flows in the cylindrical pipe. When it is drawn into the pump inlet, the impeller 411 rotates the medium, causing it to rotate inside the pipe wall. Because the solid particles are minerals and have a higher specific gravity than water, their trajectory adheres to the inner side of the pipe wall, thus causing wear. Adding protrusions along the axial direction inside the inlet pipe wall of the volute 412 can hinder the movement trajectory of the solid particles, thereby reducing the wear of the solid medium on the pipe wall.

[0054] Preferably, in this embodiment, please refer to Figure 6 and Figure 7The centrifugal unit 4 is housed in a relatively enclosed cavity composed of a volute 412, a front guard plate 413, and a rear guard plate 413. To ensure the installation and sealing of components, a C-shaped ring 415 structure is specifically adopted. The C-shaped rings 415 are arranged sequentially along the connection between the volute 412 and the guard plate 413. The two protrusions of the C-shaped ring 415 are respectively connected to the volute 412 and the guard plate 413, so that the two protrusions of the C-shape form a seal with the volute 412 and the guard plate 413, ensuring that the high-pressure cavity does not leak. In addition, in order to eliminate the thermal expansion and contraction of the metal material during temperature changes, a certain gap δ is specifically left between the guard plate 413 and the volute 412. The size of this gap is 0.01% to 0.02% of the maximum outer diameter of the guard plate 413.

[0055] Furthermore, the C-shaped ring 415 has multiple fixing ribs 416 evenly distributed along the circumferential direction on the side opposite to the volute 412. The fixing ribs 416 are distributed in a radiating pattern, which ensures the sealing performance and strength of the seal.

[0056] Preferably, in this embodiment, please refer to Figure 2 The sealing system 52 includes a heat exchanger 521, a forced circulation pump 522, an accumulator 523, and a replenishment station 53. The inlet of the heat exchanger 521 is connected to the outlet of the sealing cavity through the accumulator 523, and its outlet is connected to the inlet of the sealing cavity through the forced circulation pump 522. The supply end of the replenishment station 53 is connected to the heat exchanger 521. A third pressure transmitter P3 is installed at the outlet of the pressure unit 42, a second pressure transmitter P2 is installed in the accumulator 523, and a first pressure transmitter P1 is installed in the replenishment station 53.

[0057] The replenishment station 53 provides isolation fluid for the entire system, the sealing system 52 realizes the circulation and cooling of the isolation fluid, and the sealing body 51 is installed in the centrifugal unit 4 to ensure that the medium does not leak when the centrifugal pump is running.

[0058] During implementation, the forced circulation pump 522 increases the heat exchange of the isolation fluid, ensuring leak-free operation between the rotor and stator components during the transport of high-temperature media by the centrifugal pump. The sealing body 51 is installed between the pump rotor and stator components, specifically between the shaft and pump cover 414. The sealing cavity of the sealing body 51 is supplied with isolation fluid from the sealing system 52, providing lubrication to the friction surfaces. The isolation fluid in the sealing system 52 is supplied by the replenishment station 53. The sealing system 52 is equipped with a pressure sensor that continuously monitors the pressure of the isolation fluid in the sealing cavity, while the pump outlet pressure transmitter provides timely feedback on the pump outlet pressure. Through this interlocking mechanism, the pressure of the isolation fluid in the sealing cavity is always maintained at 0.3 MPa above the pump outlet pressure, thus ensuring proper lubrication of the mechanical seal.

[0059] The impeller 411 is mounted on the transmission unit 32. An axial adjustment mechanism is designed between the transmission unit 32 and the stator, allowing for relative axial movement between them. This ensures that the gap γ between the impeller 411 and the front guard plate 413 is 0.5mm. This gap guarantees smooth operation of the rotor components while minimizing the flow rate of the medium returning from the volute 412 cavity to the pump inlet, thereby achieving efficient operation of the centrifugal pump. In this embodiment, please refer to... Figure 2 and Figure 8 The axial adjustment mechanism is an adjustable support 6, which includes a support traction plate 61, an adjusting screw 62, a slider 63, a baffle 64, a sliding plate 65, and an anchor bolt 66.

[0060] Specifically, the support traction plate 61 and the baffle 64 are welded together with the base and installed as a whole with the pump. The slide plate 65 is fixed to the bottom end of the baffle 64. The anchor bolt 66 is movably connected to the slide plate 65 and can slide along the pump axis on the slide plate 65 and the baffle 64. The slider 63 is sleeved on the anchor bolt 66, which is pre-fabricated and fixed in the foundation. The adjusting screw 62 extends along the axial direction of the drive unit 1, is threadedly connected to the support traction plate 61, and one end is rotatably connected to the slide plate 65 to adjust the movement of the slide plate 65 in a direction parallel to the axis of the drive unit 1.

[0061] When the pump is installed and tightened, it needs to move axially as a whole. At this time, by adjusting the adjusting screw 62, the distance between the slider 63 and the support traction plate 61 is increased, thereby causing the pump unit to move axially by a certain displacement relative to the anchor bolt 66. In particular, the baffle 64 prevents the slider 63 from radially deviating during the movement; the contact surfaces of the slide plate 65 and the baffle 64 are both machined very smoothly to reduce friction during the movement.

[0062] Furthermore, the end of the adjusting screw 62 is threaded with a first nut 621, which locks the position of the adjusting screw 62 and the support traction plate 61; the top of the anchor bolt 66 is threaded with a second nut 661, which can be tightened and locked after the position is adjusted to prevent secondary axial movement; the adjustable support 6 achieves overall axial displacement of a single set of equipment by adjusting the set screw and the limit nut, ensuring that the sealing gasket is pressed tightly when the three sets of equipment are installed in series.

[0063] Please see Figure 9 and Figure 10 Secondly, embodiments of this application also provide a feed pump system, including a centrifugal slurry preheater feed pump as described in any of the above embodiments, wherein three centrifugal slurry preheater feed pumps are provided, and the three centrifugal slurry preheater feed pumps operate in series.

[0064] For ease of explanation, the three centrifugal slurry preheater feed pumps are defined as the first-stage pump B1, the second-stage pump B2, and the third-stage pump B3, respectively. In some embodiments, the feed pump system further includes a medium-temperature preheater G1, a check valve D, a pipeline E, and a high-temperature preheater G2. Each preheater is connected to the pump via a pipeline.

[0065] Specifically, the medium-temperature preheater G1 is a domed cylindrical sealed container with an internal pressure of approximately 0.8 MPa, storing an acidic slurry with a temperature of 105°C and a solid content of 30% to 45%. During implementation, the medium in this container needs to be transferred to the high-temperature preheater G2. Similarly, the high-temperature preheater G2 is a domed cylindrical sealed container with an internal pressure of approximately 2 MPa. This invention employs three high-temperature, high-pressure slurry preheater feed pumps operating in series. The advantage is that the flow rate is the same as a single pump, while the head is the sum of the three pumps, solving the problem of requiring high-pressure slurry to be delivered into the preheater. In particular, a check valve is installed at the outlet of the third-stage pump to prevent backflow of pressurized medium in the high-temperature preheater G2 under abnormal conditions.

[0066] During implementation, the medium in the medium-temperature preheater G1 is drawn in 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.

[0067] This application uses three pumps connected in series to form a feed pump system. The centrifugal slurry preheater feed pump consists of a drive unit 1, a centrifugal unit 4, and a sealing and cooling unit 5. The drive unit 1 is used to rotate the impeller 411. During implementation, the first-stage pump impeller 411 rotates under the drive of the drive unit 1. The negative pressure generated by centrifugal force draws the medium in the medium-temperature preheater into the feed inlet of the impeller cover structure. The centrifugal force generated by the rotation of the blades throws the medium into the pump chamber. After accumulating in the pump chamber, it flows to the outlet of the impeller cover structure, then enters the second-stage pump, then the third-stage pump, and so on until the last stage. The fluid is fed into a high-temperature preheater, where each stage of pump increases the fluid pressure. The final output pressure is the sum of the pressures provided by each pump, ensuring that each pump plays a role in increasing the fluid pressure. This ensures that the fluid can pass smoothly through the entire system and withstand the operating conditions under high temperature and high pressure, thereby achieving a stable, continuous, leak-free, and safe transport of high-temperature and high-pressure solid, liquid, and gas three-phase flow slurry media. At the same time, a first protrusion 4121 is set at the feed inlet of the wheel cover structure to impede the movement trajectory of solid particles, thereby reducing the wear of the solid medium on the pipe wall.

[0068] This application provides a sealed cooling unit 5, in which a sealed cavity is formed between the friction surfaces inside the sealed body 51, communicating with the isolation liquid outlet of the sealing system 52. The friction surfaces can be lubricated and cooled by the isolation liquid. The sealing system 52 of the sealed cooling unit 5 can increase the heat exchange of the isolation liquid, ensuring that there is no leakage between the rotor and stator components during the transportation of high-temperature media by the centrifugal pump.

[0069] In the description of this application, it should be noted that the terms "upper" and "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0070] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0071] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of the claims of this 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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