CN108488074B - Large-scale high-temperature high-lift two-stage full-lining slurry pump - Google Patents

Abstract

The invention relates to a large-scale high-temperature high-lift two-stage full-lining slurry pump. The slurry pump comprises a shaft, a pump cover and an outer shell, wherein the pump cover and the outer shell are fixedly arranged on the shaft, the pump cover and the outer shell are fixedly connected with each other and jointly enclose an outer shell cavity, one end, close to a driving side, of the outer shell is provided with a positioning pin hole, and a positioning pin matched with a base is arranged at the positioning pin hole; one end of the outer shell far away from the driving side is provided with a guide structure. When the slurry pump is used for conveying high-temperature liquid, one end, close to the driving side, of the outer shell is fixed, and one end, far away from the driving side, of the outer shell is free to expand in a direction far away from the driving side under the guidance of the guide structure. The invention not only prevents the damage to the driving mechanism caused by the expansion of the slurry pump, but also prevents the damage to the outer shell body, and simultaneously protects the connecting structure and the sealing structure between the components in the cavity of the outer shell, thereby ensuring the stable and reliable operation of the slurry pump.

Description

Large-scale high-temperature high-lift two-stage full-lining slurry pump

Technical Field

The invention belongs to the technical field of slurry pumps, and particularly relates to a high-temperature high-lift two-stage full-lining slurry pump containing solid catalyst particles, which is suitable for large-scale catalytic cracking, catalytic cracking and the like.

Background

Slurry pumps are widely used in the petroleum and chemical industries to convey high temperature petroleum and chemical liquids, and because of the high temperature of the liquid conveyed, not only is the pump body required to have good high temperature resistance, but also excellent sealing performance during conveying is required, and no leakage can be generated. However, the pump bodies of the existing slurry pumps are basically fixed on the base, i.e. the pump bodies of the slurry pumps are constrained by the base and are difficult to freely expand. The structure of the pump body which is restrained and difficult to freely expand not only increases the internal stress of the pump body, but also has adverse effects on the sealing structure inside the pump body, and the pump body is easy to damage and cause leakage.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a large-scale high-temperature high-lift two-stage full-lining slurry pump, the structural design of the slurry pump enables the slurry pump shell body to expand freely in a direction away from the driving side, ensures that the slurry pump is not damaged by external force, and can work stably and reliably.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

The large-scale high-temperature high-lift two-stage full-lining slurry pump comprises a shaft, a pump cover and an outer shell, wherein the pump cover and the outer shell are fixedly arranged on the shaft, the pump cover and the outer shell are fixedly connected with each other and jointly enclose an outer shell cavity, one end, close to a driving side, of the outer shell is provided with a positioning pin hole, and a positioning pin matched with a base is arranged at the positioning pin hole; one end of the outer shell far away from the driving side is provided with a guide structure.

It is further preferred that the shaft bodies extending out of the two ends of the housing cavity are respectively provided with a support bearing assembly close to the driving side and a support bearing assembly far away from the driving side, and the shaft bodies, which are positioned in the housing cavity, of the shaft are provided with impeller assemblies; the pump cover is fixedly connected with one end close to the driving side support bearing assembly, and the outer shell is fixedly connected with one end far away from the driving side support bearing assembly; the near-driving side support bearing assembly is fixedly connected with the shaft, and the far-driving side support bearing assembly is in sliding fit with the shaft.

Further preferably, a liner assembly is disposed in the housing cavity in cooperation with the impeller assembly, the liner assembly including a suction liner disposed at the suction inlet of the impeller assembly, the impeller comprises an impeller assembly, and is characterized by further comprising a pump body lining coated on the outer side of the impeller assembly, wherein an inner shell cavity is formed between the impeller assembly and the pump body lining; the suction lining is sleeved on the shaft and fixedly connected with the pump cover; the pump body lining is fixedly connected with the pump cover; a gap is arranged between the pump body lining and the inner wall of the shell cavity in the direction close to the driving side and away from the driving side; the suction liner and the pump body liner are in sliding fit with a shaft.

Further preferably, the impeller assembly comprises a primary impeller and a secondary impeller sequentially arranged on a shaft; the suction lining is arranged at the suction inlet of the first-stage impeller; the pump body lining comprises a primary lining and a secondary lining which are fixedly connected with each other and respectively coated on the outer sides of the primary impeller and the secondary impeller respectively; the first-stage liner is fixedly connected with the pump cover; a throttling sleeve for sealing is arranged between the suction lining and the secondary lining and between the secondary lining and the shaft.

Still further preferably, the impeller assembly further comprises a screw liquid inlet part arranged at the suction inlet of the first-stage impeller, the screw liquid inlet part is sleeved and fixed on the shaft, and the first-stage lining extends to one side of the screw liquid inlet part and forms a liquid inlet channel together with the screw liquid inlet part; the liquid inlet of the spiral liquid inlet component is provided with guide vanes distributed along the circumferential direction, and the suction lining extends towards one side of the guide vanes and forms a liquid guide flow passage together with the guide vanes.

Preferably, the liquid inlets of the primary impeller and the secondary impeller face away from each other, an interstage shaft sleeve is arranged between the primary impeller and the secondary impeller, an interstage partition plate is sleeved outside the interstage shaft sleeve, and a throttling sleeve for sealing is arranged between the interstage partition plate and the interstage shaft sleeve; the interstage diaphragm is fixedly coupled with the secondary liner; the primary lining, the secondary lining and the inter-stage separator are enclosed together to form an infusion flow passage which is communicated with the output end of the primary impeller and the input end of the secondary impeller.

Preferably, the outer shell is made of carbon steel, and the lining component is made of martensitic stainless steel.

Preferably, the infusion runner is provided with an annular expansion cavity at an output port of the output end of the first-stage impeller.

Further preferably, the secondary liner comprises a secondary liner shell and a secondary liner cover plate fixedly connected with each other, wherein the secondary liner shell is fixedly connected with the primary liner and the inter-stage baffle plate; the secondary lining cover plate is matched with the secondary lining shell to form a secondary impeller liquid inlet flow channel, and a secondary lining guide vane is arranged between the secondary lining cover plate and the secondary lining shell; the secondary lining shell comprises an outer shell and an inner shell, and a transition flow passage for communicating the expansion cavity and the secondary impeller liquid inlet flow passage is enclosed between the outer shell and the inner shell of the secondary lining shell; the inner layer shell of the secondary lining shell surrounds and is arranged at the output end of the secondary impeller.

Preferably, the inner wall of the throttling sleeve is provided with a plurality of annular grooves; the low pressure side of the throttle sleeve arranged between the inter-stage separator plate and the inter-stage shaft sleeve is provided with an annular buffer cavity.

The invention has the beneficial effects that:

1) The invention is characterized in that one end of the outer shell close to the driving side is provided with a locating pin and a locating pin hole, and one end of the outer shell far away from the driving side is provided with a guide structure. When the slurry pump is used for conveying high-temperature liquid, one end of the outer shell, which is close to the driving side, is fixed, and one end of the outer shell, which is far away from the driving side, is free to expand in a direction far away from the driving side under the guidance of the guide structure. Therefore, the constraint structure of the invention not only prevents the possible damage to the driving mechanism caused by the expansion of the slurry pump, but also prevents the possible damage to the outer shell, and simultaneously protects the connecting structure and the sealing structure between the components in the cavity of the outer shell, thereby ensuring the stable and reliable operation of the slurry pump.

2) The present invention also fixedly couples the near drive side back-up bearing assembly to the shaft and provides a sliding fit between the far drive side back-up bearing assembly and the shaft such that the shaft will expand freely toward the end far from the drive side when the shaft is heated.

In addition, a lining component matched with the impeller component is arranged in the shell cavity, and a suction lining and a pump body lining in the lining component are in sliding fit with the shaft, namely, one end of each component in the lining component is fixed on the pump cover, and the other end of each component can slide along the shaft body of the shaft.

In summary, three independent thermal expansion bodies are provided in the present invention, and the three thermal expansion bodies are respectively: an outer housing, a rotor assembly consisting of an impeller assembly and a shaft, a liner assembly. The three independent thermal expansion bodies are fixed on the driving side through bolts, and when the three independent thermal expansion bodies are in operation, the three independent thermal expansion bodies extend towards the non-driving side to realize uniformity of thermal expansion directions, wherein gaps are arranged on the lining component and the shell cavity in the axial direction, so that the difference of expansion amounts is realized, and the stable and reliable operation of the whole slurry pump is ensured.

3) The suction lining is fixed on the pump cover, and the invention is also provided with a spiral liquid inlet part at the suction inlet of the first-stage impeller, the liquid inlet front end of the spiral liquid inlet part is provided with a guide vane, and the spiral liquid inlet part and the first-stage lining are enclosed to form a liquid inlet flow channel; the suction lining extends towards one side of the guide vane and forms a liquid guide flow passage together with the guide vane. According to the invention, the liquid guide flow channel and the liquid inlet flow channel are arranged, so that a medium containing a solid catalyst can be smoothly guided into the impeller assembly, hydraulic loss can be reduced, and hydraulic efficiency can be effectively improved.

4) The primary and secondary liners of the present invention are wrapped around the outside of the impeller assembly, with the primary and secondary liners affixed to each other and surrounding an inner shell cavity for transporting liquid between stages. By the guidance of the suction lining and the pumping of the impeller, the mass containing a large amount of catalyst hard particles enters the inner shell cavity from the outer shell cavity and flows only inside the inner shell cavity. The suction lining, the primary lining and the secondary lining are all cast by martensitic stainless steel, so that the suction lining is high in hardness, good in wear resistance and long in service life, and long-term reliable operation of the slurry pump is ensured; correspondingly, the outer shell is made of carbon steel materials with good casting and mechanical properties, and the outer shell mainly plays a role in bearing pressure.

5) According to the invention, the capacity expansion cavity is arranged at the output port of the output end of the first-stage impeller, and the capacity expansion cavity has a relatively certain volume, so that the flow rate of liquid containing a large amount of catalyst hard particles can be reduced in advance, the scouring of the liquid medium to the root of the first-stage impeller is effectively reduced, and the service life of the first-stage impeller is prolonged.

6) According to the invention, the throttling sleeves are arranged at the sliding fit positions, and the inner wall of each throttling sleeve is provided with a plurality of radial circular grooves which are sequentially distributed along the axial direction of the shaft, so that the local resistance of the fluid leakage flow is effectively increased, and the leakage phenomenon of a medium is reduced.

In addition, an annular buffer space is provided on the low-pressure side of the throttle sleeve arranged between the intermediate space diaphragm and the intermediate space sleeve. The provision of the buffer chamber further reduces the pressure of the medium entering therein, thereby reducing the medium leakage pressure between the stages.

Drawings

Fig. 1 is a schematic structural view of the slurry pump.

Fig. 2 is an enlarged partial schematic view of fig. 1.

Fig. 3 and 4 are schematic structural views of the secondary liner casing.

The meaning of the reference symbols in the figures is as follows:

10-shaft 20-pump cover 30-outer shell 31-positioning pin hole 32-guide groove

40-Near drive side back-up bearing assembly 50-far from drive side back-up bearing assembly

60-Impeller assembly 61-spiral liquid inlet member 611-guide vane

62-Primary impeller 63-secondary impeller 64-interstage shaft sleeve

70-Liner assembly 71-suction liner 72-primary liner 73-secondary liner

731-Secondary liner casing 731 a-first annular section 731 b-second annular section

731 C-third ring segment 7311-open slot 7312-outlet channel

732-Secondary liner cover plate 733-Secondary liner guide vane

74-Inter-stage separator 75-throttle sleeve 751-groove 752-buffer chamber

A-liquid guide channel B-liquid inlet channel C-transfusion channel

C1-expansion cavity C2-transition runner C3-secondary impeller liquid inlet runner

D-arc through hole

Detailed Description

For ease of understanding, the specific structure of each component of the headlamp module is further described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the large-scale high-temperature high-lift two-stage full-lining slurry pump comprises a shaft 10, a pump cover 20 and an outer shell 30, wherein the pump cover 20 and the outer shell 30 are fixedly connected with each other and jointly enclose an outer shell cavity, one end, close to a driving side, of the outer shell 30 is provided with a positioning pin hole 31, and a positioning pin matched with a base is arranged at the positioning pin hole 31; the end of the outer housing 30 remote from the drive side is provided with a guide structure.

As shown in fig. 1, the outer housing 30 is mounted on a base; the guide structure includes a guide groove 32 provided on the outer housing 30, and the outer housing 30 is slidably engaged with the base through the guide groove 32.

As shown in fig. 1, the shaft body of the shaft 10 extending out of the two ends of the housing cavity is respectively provided with a support bearing assembly 40 close to the driving side and a support bearing assembly 50 far away from the driving side, and the shaft body of the shaft 10 positioned in the housing cavity is provided with an impeller assembly 60; the pump cover 20 is fixedly connected with one end close to the driving side support bearing assembly 40, and the outer shell 30 is fixedly connected with one end far away from the driving side support bearing assembly 50; the proximal drive side back-up bearing assembly 40 is fixedly coupled to the shaft 10 and the distal drive side back-up bearing assembly 50 is in sliding engagement with the shaft 10.

As shown in fig. 1, the liner assembly 70 matched with the impeller assembly 60 is arranged in the outer shell cavity, the liner assembly 70 comprises a suction liner 71 arranged at the suction inlet of the impeller assembly 60 and a pump body liner coated on the outer side of the impeller assembly 60, and an inner shell cavity is formed between the impeller assembly 60 and the pump body liner; the suction liner 71 is sleeved on the shaft 10, and the suction liner 71 is fixedly connected with the pump cover 20; the pump body liner is fixedly coupled to the pump cap 20; a gap is arranged between the pump body lining and the inner wall of the shell cavity in the direction close to the driving side and away from the driving side; the suction liner 71 and the pump body liner are both in sliding engagement with the shaft 10.

As shown in fig. 1 and 2, the impeller assembly 60 includes a primary impeller 62 and a secondary impeller 63 disposed in sequence on the shaft 10; the suction liner 71 is disposed at the suction inlet of the primary impeller 61; the pump body liner comprises a primary liner 72 and a secondary liner 73 fixedly coupled to each other and respectively coated outside the primary impeller 62 and the secondary impeller 63; the primary liner 72 is fixedly coupled to the pump cap 20; a throttle sleeve 75 for sealing is provided between the suction liner 71 and the secondary liner 73 and the shaft 10.

As shown in fig. 1, the impeller assembly 60 further includes a screw liquid inlet member 61 disposed at the suction inlet of the primary impeller 62, the screw liquid inlet member 61 is sleeved and fixed on the shaft 10, and the primary liner 72 extends to one side of the screw liquid inlet member 61 and forms a liquid inlet channel B together with the screw liquid inlet member 61; the liquid inlet of the spiral liquid inlet part 61 is provided with guide vanes 611 distributed along the circumferential direction, and the suction liner 71 extends towards one side of the guide vanes 611 and forms a liquid guide channel a together with the guide vanes 611.

As shown in fig. 1 and 2, the liquid inlets of the primary impeller 62 and the secondary impeller 63 face away from each other, i.e. the primary impeller 62 and the secondary impeller 63 are arranged back to back, so that the axial forces of the primary impeller 62 and the secondary impeller 63 can be effectively balanced; an interstage shaft sleeve 64 is arranged between the primary impeller 62 and the secondary impeller 63, an interstage partition 74 is sleeved outside the interstage shaft sleeve 64, and a throttling sleeve 75 for sealing is arranged between the interstage partition 74 and the interstage shaft sleeve 64; the interstage diaphragm 74 is fixedly coupled to the secondary liner 73; the primary liner 72, secondary liner 73 and interstage diaphragm 74 cooperate to define an infusion flow path C that communicates between the output of the primary impeller 62 and the input of the secondary impeller 63.

Preferably, the outer shell 30 is carbon steel and the liner assembly 70 is martensitic stainless steel.

As shown in fig. 1, the infusion flow channel C is provided with an annular expansion cavity C1 at an output port of the output end of the first-stage impeller 62.

As shown in fig. 1, the secondary liner 73 includes a secondary liner housing 731 and a secondary liner cover plate 732 fixedly connected to each other, the secondary liner housing 731 being fixedly connected to both the primary liner 72 and the inter-stage bulkhead 74; the secondary lining cover plate 732 is matched with the secondary lining shell 731 to form a secondary impeller liquid inlet channel C3, a secondary lining guide vane 733 is arranged between the secondary lining cover plate 732 and the secondary lining shell 731, and the secondary impeller liquid inlet channel C3 is communicated with the input end of the secondary impeller 63; the secondary lining casing 731 comprises an outer casing and an inner casing, and a transition flow channel C2 for communicating the expansion cavity C1 and the secondary impeller liquid inlet flow channel C3 is enclosed between the outer casing and the inner casing of the secondary lining casing 731; the inner shell of the secondary liner shell 731 surrounds the output end of the secondary impeller 63, and a throttle sleeve 75 is disposed between the outer shell of the secondary liner shell 731 and the shaft 10.

As shown in fig. 3 and 4, the secondary liner casing 731 may be formed as a ring-shaped part by integrally casting, and is divided into a first ring segment 731a, a second ring segment 731b and a third ring segment 731c from the inner side to the outer side, and an open slot 7311 opposite to the output end of the secondary impeller 63 and an outlet passage 7312 penetrating the first ring segment 731a, the second ring segment 731b and the third ring segment 731c are formed on the inner side of the first ring segment 731 a. The open groove 7311 extends circumferentially along the inner side surface of the first ring segment 731a and has a cross-sectional area gradually increasing from zero, and the end of the open groove 7311 having a larger cross-sectional area communicates with the outlet passage 7312. The side surface of the first ring segment 731a with the open slot 7311, i.e. the inner shell of the secondary liner shell 731, is provided with the open slot 7311 and the outlet channel 7312 as channels for fluid out of the inner shell cavity. The open slot structure is used for realizing the gradual pressurization process of fluid, and can greatly improve the working efficiency of the pump.

As shown in fig. 4, the second ring segment 731b of the secondary liner casing 731 is provided with a plurality of arc-shaped through holes D along the axial direction of the shaft 10, and the arc-shaped through holes D are circumferentially spaced apart from each other along the secondary liner casing 731, and 7 arc-shaped through holes D are provided in this embodiment, and the flow direction of the transition flow channel C2 formed by the arc-shaped through holes D is parallel to the axial direction of the shaft 10. The transition flow channel C2 in the present invention is formed by a plurality of arc-shaped through holes, so that the pressure of the fluid entering the secondary impeller 21 can be properly reduced, thereby avoiding the large pressure at the sealing position of the secondary impeller 21, and having the functions of protecting the sealing and preventing leakage.

The third ring segment 731c forms an outer shell of the secondary liner shell 731 by connecting a baffle outside the secondary liner guide vane 733, with a throttle sleeve 75 disposed between the baffle and the shaft 10.

As shown in fig. 2, the inner wall of each throttle sleeve 75 is provided with a plurality of annular grooves 751; an annular buffer chamber 752 is provided on the low-pressure side of the throttle sleeve 75, which is arranged between the inter-stage diaphragm 74 and the inter-stage bushing 64.

Claims (4)

1. The utility model provides a full lining slurry pump of large-scale high temperature high lift two-stage, includes axle (10), still includes pump cover (20) and shell body (30) that set up on axle (10), pump cover (20) and shell body (30) are rigid coupling each other and enclose into shell cavity jointly, its characterized in that: one end, close to the driving side, of the outer shell (30) is provided with a positioning pin hole (31), and a positioning pin matched with the base is arranged at the positioning pin hole (31); a guide structure is arranged at one end of the outer shell (30) far away from the driving side;

The shaft body, which extends out of the two ends of the shell cavity, of the shaft (10) is respectively provided with a support bearing assembly (40) close to the driving side and a support bearing assembly (50) far away from the driving side, and the shaft body, which is positioned in the shell cavity, of the shaft (10) is provided with an impeller assembly (60); the pump cover (20) is fixedly connected with one end close to the driving side support bearing assembly (40), and the outer shell (30) is fixedly connected with one end far away from the driving side support bearing assembly (50); the near-drive side support bearing assembly (40) is fixedly connected with the shaft (10), and the far-drive side support bearing assembly (50) is in sliding fit with the shaft (10);

The inner shell comprises an outer shell cavity, wherein a lining component (70) matched with an impeller component (60) is arranged in the outer shell cavity, the lining component (70) comprises a suction lining (71) arranged at a suction inlet of the impeller component (60), and further comprises a pump body lining coated on the outer side of the impeller component (60), and an inner shell cavity is formed between the impeller component (60) and the pump body lining; the suction lining (71) is sleeved on the shaft (10), and the suction lining (71) is fixedly connected with the pump cover (20); the pump body lining is fixedly connected with the pump cover (20); a gap is arranged between the pump body lining and the inner wall of the shell cavity in the direction close to the driving side and away from the driving side; the suction liner (71) and the pump body liner are in sliding fit with the shaft (10);

The impeller assembly (60) comprises a primary impeller (62) and a secondary impeller (63) which are sequentially arranged on the shaft (10); the suction liner (71) is arranged at the suction inlet of the first-stage impeller (62); the pump body lining comprises a primary lining (72) and a secondary lining (73) which are fixedly connected with each other and respectively cover the outer sides of the primary impeller (62) and the secondary impeller (63); the primary liner (72) is fixedly connected with the pump cover (20); a throttling sleeve (75) for sealing is arranged between the suction lining (71) and the secondary lining (73) and the shaft (10);

the liquid inlets of the primary impeller (62) and the secondary impeller (63) are away from each other, an interstage shaft sleeve (64) is arranged between the primary impeller (62) and the secondary impeller (63), an interstage partition plate (74) is sleeved outside the interstage shaft sleeve (64), and a throttling sleeve (75) for sealing is arranged between the interstage partition plate (74) and the interstage shaft sleeve (64); the inter-stage separator (74) is fixedly connected with the secondary lining (73); the primary lining (72), the secondary lining (73) and the inter-stage separator (74) are enclosed together to form an infusion flow passage (C) which is communicated with the output end of the primary impeller (62) and the input end of the secondary impeller (63);

the infusion flow passage (C) is provided with an annular expansion cavity (C1) at an output port of the output end of the first-stage impeller (62);

The secondary liner (73) comprises a secondary liner housing (731) and a secondary liner cover plate (732) fixedly connected to each other, the secondary liner housing (731) being fixedly connected to both the primary liner (72) and the inter-stage bulkhead (74); the secondary lining cover plate (732) is matched with the secondary lining shell (731) to form a secondary impeller liquid inlet flow channel (C3), and a secondary lining guide vane (733) is arranged between the secondary lining cover plate (732) and the secondary lining shell (731); the secondary lining shell (731) comprises an outer shell and an inner shell, and a transition flow passage (C2) for communicating the expansion cavity (C1) and the secondary impeller liquid inlet flow passage (C3) is formed between the outer shell and the inner shell of the secondary lining shell (731); the inner shell of the secondary lining shell (731) is circumferentially arranged at the output end of the secondary impeller (63);

the secondary lining shell (731) is annular, the inner side of the secondary lining shell is divided into a first annular section (731 a), a second annular section (731 b) and a third annular section (731 c) from the inner side to the outer side, an open slot (7311) opposite to the output end of the secondary impeller (63) and an outlet channel (7312) penetrating through the first annular section (731 a), the second annular section (731 b) and the third annular section (731 c) are formed on the inner side surface of the first annular section (731 a); the open groove (7311) extends along the circumferential direction of the inner side surface of the first ring section (731 a) and the cross-sectional area gradually increases from zero, and the end of the open groove (7311) with the larger cross-sectional area is communicated with the outlet channel (7312); the side surface of the first ring section (731 a) with the open slot (7311), namely the inner layer shell of the secondary lining shell (731), takes the open slot (7311) and the outlet channel (7312) as the channel for fluid to flow out of the inner shell cavity;

A plurality of arc-shaped through holes (D) are formed in the second annular section (731 b) of the secondary lining shell (731) along the axial direction of the shaft (10), and the arc-shaped through holes (D) are circumferentially arranged at intervals along the secondary lining shell (731); the flow direction of the transition flow channel (C2) formed by the arc-shaped through holes (D) is parallel to the axial direction of the shaft (10).

2. The large-scale high-temperature high-lift two-stage full-liner slurry pump of claim 1, wherein: the impeller assembly (60) further comprises a spiral liquid inlet component (61) arranged at the suction inlet of the first-stage impeller (62), the spiral liquid inlet component (61) is sleeved and fixed on the shaft (10), and the first-stage lining (72) extends to one side of the spiral liquid inlet component (61) and forms a liquid inlet channel (B) together with the spiral liquid inlet component (61); the liquid inlet of the spiral liquid inlet part (61) is provided with guide vanes (611) distributed along the circumferential direction, and the suction lining (71) extends towards one side of the guide vanes (611) and forms a liquid guide channel (A) together with the guide vanes (611).

3. The large-scale high-temperature high-lift two-stage full-liner slurry pump of claim 1, wherein: the outer shell (30) is made of carbon steel, and the lining component (70) is made of martensitic stainless steel.

4. The large-scale high-temperature high-lift two-stage full-liner slurry pump of claim 1, wherein: the inner wall of the throttling sleeve (75) is provided with a plurality of annular grooves (751); an annular buffer chamber (752) is provided on the low-pressure side of a throttle sleeve (75) arranged between the inter-stage separator (74) and the inter-stage sleeve (64).