CN212155172U

CN212155172U - Centrifugal multistage pump

Info

Publication number: CN212155172U
Application number: CN201922435109.9U
Authority: CN
Inventors: 滕海龙; 葛帝宏; 徐金华; 成科; 杨首谋; 仇剑; 张玉芬; 邓业稳
Original assignee: Hefei Huasheng Pumps & Valves Co ltd
Current assignee: Hefei Huasheng Pumps & Valves Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-12-15
Anticipated expiration: 2029-12-30

Abstract

The utility model belongs to the technical field of centrifugal pumps, in particular to a centrifugal multistage pump, which comprises a pump body, wherein a suction impeller group and a discharge impeller group which are arranged along the length direction are sleeved on a driving shaft in a pump body cavity, the suction impeller group and the discharge impeller group are symmetrically arranged, a transition component which divides a cavity of the pump body into a suction cavity and a discharge cavity is arranged in a smooth tube cavity of the pump body, the suction impeller group sucks materials from a feeding hole and guides the materials into the discharge cavity through the transition component by arranging the transition component, the discharge impeller group in the discharge cavity guides the materials in the discharge cavity out of a discharge hole of the pump body through the transition component, the feeding hole is positioned at one end of the pump, the discharge hole is positioned at the middle part of the pump body, the area occupied by the other end of the pump is reduced, so that the pump can be installed in a narrower space, the installation is more convenient, the application range is wide, and the total friction loss efficiency and the material loss efficiency of the pumping, thereby achieving performance stability.

Description

Centrifugal multistage pump

Technical Field

The utility model belongs to the technical field of the centrifugal pump, concretely relates to centrifugal multistage pump.

Background

The pump is an energy device for converting energy output by the prime motor into medium pressure energy, and is mainly used for conveying liquid including water, oil, acid-base liquid, emulsion liquid, liquid metal and the like, and also can convey gas mixture and liquid containing suspended solids. The pump can apply to the agricultural, apply to the chemical industry, the oil production field, in mining and metallurgical industry, the electric power field etc., often can receive installation space limited in these application fields, traditional centrifugal pump is because of structural problem, be difficult to the installation in narrow and small space, it is protruding to have the annular on the pump body usually, and the feed inlet and the discharge gate of pump are located the both ends of pump body usually, feed inlet and discharge gate need occupy very big space, at this moment will lead to the pump occupation space big, the pump body can't be installed in narrow and small space, the dismouting is inconvenient, simultaneously again because of the structure is complicated, economic benefits is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a centrifugal multistage pump, through set up the transition subassembly in the pump chamber, the distance between feed inlet and the discharge gate is shortened to the structure of rational arrangement pump intracavity, makes the shared volume of pump reduce, the installation of being convenient for more, and application range is wide.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a centrifugal multistage pump, includes the pump body, the cover is equipped with along the suction impeller group and the discharge impeller group that length direction arranged on the drive shaft in the pump body intracavity, suction impeller group and discharge impeller group are symmetrical to be arranged, be equipped with the transition subassembly that divide into its cavity suction chamber and discharge chamber in the smooth tube intracavity of the pump body, suction impeller group and discharge impeller group arrange respectively in suction chamber and discharge chamber, suction impeller group inhales the material from the feed inlet and leads to the discharge chamber in through the transition subassembly, lead to the discharge chamber outside the discharge gate of pump body through the transition subassembly with the material in the discharge chamber by the discharge impeller group.

Preferably, the transition assembly comprises a transition ring which is in sealing fit with the smooth inner wall of the cylindrical pump body, the transition ring is sleeved on the driving shaft, and the transition ring is provided with a positive flow channel which is communicated with the suction cavity and the discharge cavity, a reverse flow channel which is communicated with the discharge cavity and the outside of the pump body.

Preferably, the inlets of the positive flow channel and the reverse flow channel are smaller than the sizes of the outlets of the positive flow channel and the reverse flow channel, and the inner cavities of the positive flow channel and the reverse flow channel are gradually enlarged.

Preferably, the positive runner and the reverse runner are distributed in the circumferential direction of the transition ring equally and in equal number, and the positive runner and the reverse runner are arranged in a dislocation manner.

Preferably, the transition ring is divided into a step shape with a small diameter section and a large diameter section, the small diameter section and the large diameter section are in smooth curve transition, the small diameter section is positioned on one side of the suction impeller group, the large diameter section is positioned on one side of the discharge impeller group, and the large diameter section and the inner wall of the cylindrical pump body form sealing fit; the inlet of the positive flow channel is positioned on the end surface of the small-diameter section and is close to the middle part, and the outlet of the positive flow channel is positioned on the end surface of the large-diameter section and is close to the edge; the inlet of the reverse flow channel is positioned on the end face of the large-diameter section and is close to the middle part, and the outlet of the reverse flow channel is positioned at the transition position between the small-diameter section and the large-diameter section.

Preferably, the inlets and outlets of the positive flow channel and the reverse flow channel are in smooth curve transition; the sections of the positive flow channel and the reverse flow channel are integrally trapezoidal, and the side positioned on the inner side is larger than the side positioned on the outer side; the end surface of the transition ring at the position of the inlet of the positive runner is concave, and the end surface of the transition ring at the position of the inlet of the reverse runner is also concave.

Preferably, a suction impeller shell for separating the inner wall of the pump body from the suction impeller group is arranged outside the suction impeller group, and two ends of the suction impeller shell respectively abut against the end face of the small-diameter section of the transition ring and the inner end cover of the pump body; and a gap formed between the suction impeller shell and the pump body is communicated with an outlet of the reverse flow channel.

Preferably, a discharge impeller shell for separating the inner wall of the pump body from the discharge impeller group is arranged outside the discharge impeller group, and a gap formed between the discharge impeller shell and the inner wall of the pump body is communicated with a discharge cavity provided with the discharge impeller group; the outlet of the positive flow passage is positioned in the gap between the discharge impeller shell and the inner wall of the pump body.

Preferably, the inlet of the positive flow channel is close to the impeller position of the suction impeller group; the inlet of the reverse flow channel is close to the position of the impeller of the discharge impeller set.

Preferably, the outer peripheral surface of the large-diameter section of the transition ring is provided with a sealing groove, and an O-shaped sealing ring is arranged in the sealing groove; a throttling bush is arranged between the transition ring and the driving shaft, one end of the throttling bush is provided with a lug, a through hole is formed in the lug, and a bolt penetrates through the through hole to fixedly connect the throttling bush to the transition ring.

The beneficial effects of the utility model reside in that:

1) through setting up the transition subassembly, inhale the impeller group and inhale the material from the feed inlet and lead to the discharge chamber through crossing the subassembly, the material in the discharge chamber is led to the discharge gate of the pump body through the transition subassembly by the discharge impeller group in the discharge chamber, rationally arrange the structure in the pump chamber, neither influence the effect of pump, distance between feed inlet and the discharge gate has been shortened again, the feed inlet is located the one end of pump in this embodiment, and the discharge gate is located the middle part position of pump body, the area that the other end of pump occupy will reduce, feed inlet and discharge gate have only taken half the position of pump body promptly, make the pump can install in narrow and small space more, be convenient for more the installation, the application range is wide, the material loss efficiency of total friction loss efficiency and pumping simultaneously is less, thereby reach performance stability.

2) The outer annular surface of the transition ring is tightly attached to the inner wall of the pump body, the suction cavity is isolated from the discharge cavity, the suction and discharge of the pump are reasonably separated through the arrangement of the positive flow channel and the reverse flow channel, and the suction material and the discharge material of the pump are enabled to be not interfered with each other.

3) The kinetic energy of the materials can be converted into pressure energy, namely, the materials are introduced from the inlet of the positive flow channel at a high speed by the suction impeller group in the suction cavity, the kinetic energy is gradually converted into the pressure energy by the materials along with the gradual increase of the channel inner cavity of the positive flow channel and reaches the discharge cavity, the materials form extremely high pressure in the discharge cavity, the materials are conveniently discharged from the discharge cavity by the discharge impeller group, and the discharge efficiency is improved; the discharge impeller group in the discharge cavity guides in the material from the high-speed import of the entry of backward flow way, and along with the increase gradually of the passageway inner chamber of backward flow way, the material converts kinetic energy into pressure energy gradually and arrives in the discharge gate, forms high pressure, is convenient for deal with the work demand of low discharge high lift.

4) The positive runner and the reverse runner are distributed in a plurality of equal and both quantities in the circumferential direction of the transition ring, and the positive runner and the reverse runner are arranged in a staggered mode between the positive runner and the reverse runner, so that the pumping speed and the flow of the pump are guaranteed on the one hand, the positive runner and the reverse runner are guaranteed to offset the radial force of the pump when the flow is guided, and on the other hand, the suction material and the discharge material of the pump are further guaranteed to be not interfered with each other.

5) The space between the outlet of the reverse flow channel and the discharge port is enlarged in the limited pump cavity space of the pump body, and more materials can be introduced into the gap formed between the suction impeller shell and the pump body, so that the working requirement of small flow and high lift is further ensured.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a partial structure of the transition assembly of the present invention;

FIG. 3 is a schematic view of a transition ring;

fig. 4 is a schematic structural view of a section B-B in fig. 3.

Detailed Description

For the purpose of facilitating understanding, the present invention will be described in detail below with reference to the accompanying drawings.

A centrifugal multistage pump comprises a pump body 10, wherein a suction impeller group 21 and a discharge impeller group 22 which are arranged along the length direction are sleeved on a driving shaft 13 in a tube cavity of the pump body 10, the suction impeller group 21 and the discharge impeller group 22 are symmetrically arranged, a transition assembly 30 which divides a cavity of the pump body 10 into a suction cavity 11 and a discharge cavity 12 is arranged in a smooth tube cavity of the pump body 10, the suction impeller group 21 and the discharge impeller group 22 are respectively arranged in the suction cavity 11 and the discharge cavity 12, a material is sucked from a feeding hole 40 by the suction impeller group 21 and is guided to the discharge cavity 12 through the transition assembly 30, and the material in the discharge cavity 12 is guided out of a discharging hole 50 of the pump body 10 through the transition assembly 30 by the discharge impeller group 22. Through setting up transition subassembly 30, inhale impeller group 21 and inhale the material from feed inlet 40 and lead to the discharge chamber 12 through crossing subassembly 30, the material in discharge chamber 12 is led to outside the discharge gate 50 of the pump body 10 through transition subassembly 30 by discharge impeller group 22 in the discharge chamber 12, rationally arrange the structure in the pump chamber, neither influence the effect of pump, the distance between feed inlet 40 and discharge gate 50 has been shortened again, feed inlet 40 is located the one end of pump in this embodiment, and discharge gate 50 is located the middle part position of pump body, the area that the other end of pump occupied will reduce, feed inlet 40 and discharge gate 50 have only occupied half the position of pump body promptly, make the pump can install in narrower and narrower space, be convenient for more install, the application range is wide, overall friction loss efficiency and the material loss efficiency of pumping are less simultaneously, thereby reach performance stability.

More specifically, the transition assembly 30 includes a transition ring 31 which is in sealing fit with the smooth inner wall of the cylindrical pump body 10, the transition ring 31 is sleeved on the driving shaft 13, and the transition ring 31 is provided with a positive flow passage 311 which communicates the suction cavity 11 with the discharge cavity 12, the discharge cavity 12 and a reverse flow passage 312 outside the pump body 10. The outer annular surface of the transition ring 31 is tightly attached to the inner wall of the pump body 10, the suction cavity 11 is isolated from the discharge cavity 12, and the suction and discharge of the pump are reasonably separated through the arrangement of the positive flow channel 311 and the reverse flow channel 312, so that the suction material and the discharge material of the pump are not interfered with each other.

The inlets of the positive flow passage 311 and the reverse flow passage 312 are smaller than the respective outlets, and the inner cavities of the positive flow passage 311 and the reverse flow passage 312 are gradually enlarged, so that the kinetic energy of the material can be converted into pressure energy, namely, the material is introduced from the inlet of the positive flow passage 311 at high speed by the suction impeller group 21 in the suction cavity 11, and the kinetic energy is gradually converted into the pressure energy by the material and reaches the discharge cavity 12 along with the gradual enlargement of the inner cavity of the passage of the positive flow passage 311, so that the material forms extremely high pressure in the discharge cavity 12, the discharge impeller group 22 is convenient to discharge the material from the discharge cavity 12, and the discharge efficiency is improved; the discharging impeller set 22 in the discharging cavity 12 guides the material from the inlet of the reverse flow channel 312 at a high speed, and the material gradually converts kinetic energy into pressure energy and reaches the discharging port 50 along with the gradual increase of the channel inner cavity of the reverse flow channel 312, so that extremely high pressure is formed, and the working requirement of small flow and high lift is conveniently met.

The positive flow channel 311 and the reverse flow channel 312 are equally distributed in the circumferential direction of the transition ring 31 and are equal in number, and the positive flow channel 311 and the reverse flow channel 312 are arranged in a dislocation manner. Such setting, on the one hand guarantee the speed of taking and the flow of pump, guarantee that positive runner 311 and backward flow way 312 offset the radial force of pump when the water conservancy diversion, on the other hand further guarantees to make the not mutual interference of the material of inhaling of pump and discharge material.

The transition ring 31 is divided into a small diameter section 313 and a large diameter section 314, and the small diameter section 313 and the large diameter section 314 are in smooth curve transition, wherein the small diameter section 313 is positioned at one side of the suction impeller set 21, the large diameter section 314 is positioned at one side of the discharge impeller set 22, and the large diameter section 314 and the inner wall of the cylindrical pump body 10 form sealing fit; the inlet of the positive flow channel 311 is positioned on the end surface of the small-diameter section 313 and is close to the middle part, and the outlet is positioned on the end surface of the large-diameter section 314 and is close to the edge; the inlet of the back flow channel 312 is located on the end face of the large diameter section 314 and is close to the middle, and the outlet is located at the transition position between the small diameter section 313 and the large diameter section 314.

The inlets and outlets of the positive flow passage 311 and the reverse flow passage 312 are in smooth curve transition, so that the materials are more stable when flowing in the flow passages at high speed, and no impact force is applied to the flow passages; the sections of the positive flow passage 311 and the reverse flow passage 312 are entirely trapezoidal, and the side positioned on the inner side is larger than the side positioned on the outer side; the end face of the transition ring 31 at the position of the inlet of the positive flow passage 311 is concave, the end face of the transition ring 31 at the position of the inlet of the reverse flow passage 312 is also concave, and the concave arrangement can ensure that part of the impellers sucking the impeller assembly 21 or discharging the impeller assembly 22 extend into the concave area of the transition ring 31, so that the impeller assembly can pump materials more conveniently.

A suction impeller shell 211 for separating the inner wall of the pump body 10 from the suction impeller group 21 is arranged outside the suction impeller group 21, and two ends of the suction impeller shell 211 respectively abut against the end surface of the small-diameter section 313 of the transition ring 31 and the inner end cover 14 of the pump body 10; the gap formed between the suction impeller housing 211 and the pump body 10 communicates with the outlet of the reverse flow path 312. With the arrangement, the space from the outlet of the backflow passage 312 to the discharge port 50 is increased in the limited pump cavity space of the pump body 10, and more materials can be introduced into the gap formed between the suction impeller shell 211 and the pump body 10, so that the working requirement of low flow and high lift is further ensured.

A discharge impeller shell 221 for separating the inner wall of the pump body 10 from the discharge impeller group 22 is arranged outside the discharge impeller group 22, and a gap formed between the discharge impeller shell 221 and the inner wall of the pump body 10 is communicated with the discharge cavity 12 provided with the discharge impeller group 22; the outlet of the positive flow passage 311 is located at the gap between the discharge impeller shell 221 and the inner wall of the pump body 10. Consistent with above-mentioned principle, increased the space in discharge chamber 12, made the discharge chamber 12 in the material possess bigger pressure, the impeller group 22 of being convenient for discharge the material from discharge chamber 12, improve discharge efficiency, also be the further assurance to the work demand of low discharge high-lift.

The inlet of the positive flow passage 311 is adjacent to the impeller position of the suction impeller group 21; the inlet of the return channel 312 is adjacent the impeller of the discharge impeller assembly 22.

The outer peripheral surface of the large-diameter section 314 of the transition ring 31 is provided with a sealing groove 315, and an O-shaped sealing ring is arranged in the sealing groove 315, so that the transition ring 31 is further ensured to isolate the suction cavity 11 from the discharge cavity 12, the sealing effect is improved, the high pressure and the low pressure of the two cavities are isolated, and the pump is more stable; a throttling bush 60 is arranged between the transition ring 31 and the driving shaft 13, one end of the throttling bush 60 is provided with a lug 61, the lug 61 is provided with a through hole, a bolt passes through the through hole to fixedly connect the throttling bush 60 to the transition ring 31, the throttling bush 60 is also arranged to completely isolate the suction cavity 11 from the discharge cavity 12, meanwhile, the lug 61 is arranged to ensure that the connection between the throttling bush 60 and the transition ring 31 is completely sealed, and the throttling bush 60 and other rotating parts have a throttling gap which plays the roles of throttling sealing and preventing static and static friction.

Claims

1. A centrifugal multistage pump comprises a pump body (10), wherein a driving shaft (13) in a tube cavity of the pump body (10) is sleeved with a suction impeller group (21) and a discharge impeller group (22) which are arranged along the length direction, and the centrifugal multistage pump is characterized in that: the suction impeller set (21) and the discharge impeller set (22) are symmetrically arranged, a transition assembly (30) for dividing a cavity of the pump body (10) into a suction cavity (11) and a discharge cavity (12) is arranged in a smooth tube cavity of the pump body (10), the suction impeller set (21) and the discharge impeller set (22) are respectively arranged in the suction cavity (11) and the discharge cavity (12), the suction impeller set (21) sucks materials from a feed inlet (40) and guides the materials to the discharge cavity (12) through the transition assembly (30), and the discharge impeller set (22) guides the materials in the discharge cavity (12) out of a discharge outlet (50) of the pump body (10) through the transition assembly (30).

2. A centrifugal multistage pump according to claim 1, characterized in that: the transition assembly (30) comprises a transition ring (31) which is in sealing fit with the smooth inner wall of the cylindrical pump body (10), the transition ring (31) is sleeved on the driving shaft (13), and a positive flow channel (311) which is communicated with the suction cavity (11) and the discharge cavity (12), a discharge cavity (12) and a reverse flow channel (312) outside the pump body (10) are arranged on the transition ring (31).

3. A centrifugal multistage pump according to claim 2, characterized in that: the inlets of the positive flow passage (311) and the reverse flow passage (312) are smaller than the sizes of the outlets of the positive flow passage and the reverse flow passage, and the inner cavities of the positive flow passage and the reverse flow passage are gradually enlarged.

4. A centrifugal multistage pump according to claim 2, characterized in that: the positive flow channel (311) and the reverse flow channel (312) are distributed in the circumferential direction of the transition ring (31) in an equal manner, the number of the positive flow channel and the reverse flow channel is equal, and dislocation is arranged between the positive flow channel (311) and the reverse flow channel (312).

5. A centrifugal multistage pump according to claim 2, characterized in that: the transition ring (31) is divided into a small-diameter section (313) and a large-diameter section (314) in a stepped shape, smooth curve transition is formed between the small-diameter section (313) and the large-diameter section (314), the small-diameter section (313) is located on one side of the suction impeller set (21), the large-diameter section (314) is located on one side of the discharge impeller set (22), and the large-diameter section (314) and the inner wall of the cylindrical pump body (10) form sealing fit; the inlet of the positive flow channel (311) is positioned on the end surface of the small-diameter section (313) and is close to the middle part, and the outlet of the positive flow channel is positioned on the end surface of the large-diameter section (314) and is close to the edge; the inlet of the reverse flow channel (312) is positioned on the end face of the large-diameter section (314) and is close to the middle part, and the outlet is positioned at the transition position between the small-diameter section (313) and the large-diameter section (314).

6. A centrifugal multistage pump according to claim 5, characterized in that: the inlets and the outlets of the positive flow passage (311) and the reverse flow passage (312) are in smooth curve transition; the sections of the positive flow channel (311) and the reverse flow channel (312) are integrally trapezoidal, and the side positioned at the inner side is larger than the side positioned at the outer side; the end face of the transition ring (31) at the position of the inlet of the positive runner (311) is concave, and the end face of the transition ring (31) at the position of the inlet of the reverse runner (312) is also concave.

7. A centrifugal multistage pump according to claim 5, characterized in that: a suction impeller shell (211) for separating the inner wall of the pump body (10) from the suction impeller group (21) is arranged outside the suction impeller group (21), and two ends of the suction impeller shell (211) are respectively abutted against the end surface of the small-diameter section (313) of the transition ring (31) and the inner end cover (14) of the pump body (10); a gap formed between the suction impeller shell (211) and the pump body (10) is communicated with an outlet of the reverse flow passage (312).

8. A centrifugal multistage pump according to claim 7, characterized in that: a discharge impeller shell (221) for separating the inner wall of the pump body (10) from the discharge impeller group (22) is arranged outside the discharge impeller group (22), and a gap formed between the discharge impeller shell (221) and the inner wall of the pump body (10) is communicated with a discharge cavity (12) provided with the discharge impeller group (22); the outlet of the positive flow passage (311) is located at the gap between the discharge impeller shell (221) and the inner wall of the pump body (10).

9. A centrifugal multistage pump according to claim 8, characterized in that: the inlet of the positive flow channel (311) is close to the impeller position of the suction impeller group (21); the inlet of the reverse flow channel (312) is adjacent to the position of the impeller of the discharge impeller group (22).

10. A centrifugal multistage pump according to claim 5, characterized in that: a sealing groove (315) is formed in the outer peripheral surface of the large-diameter section (314) of the transition ring (31), and an O-shaped sealing ring is arranged in the sealing groove (315); a throttling bush (60) is arranged between the transition ring (31) and the driving shaft (13), one end of the throttling bush (60) is provided with a lug (61), the lug (61) is provided with a through hole, and a bolt penetrates through the through hole to fixedly connect the throttling bush (60) to the transition ring (31).