CN110863995A

CN110863995A - Low-temperature immersed pump with guide flow channel on shell

Info

Publication number: CN110863995A
Application number: CN201911260276.2A
Authority: CN
Inventors: 石恩华; 高晓佳; 李宏凯; 石祥忠; 刘斌
Original assignee: Tianjin Baiyan Technology Co Ltd
Current assignee: Tianjin Baiyan Technology Co Ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-03-06

Abstract

The invention provides a low-temperature immersed pump with a guide flow channel on a shell, relates to the technical field of immersed pumps, and mainly aims to provide an immersed pump with better working efficiency. This casing has low temperature immersed pump of direction runner includes the pump body, and the pump body is by supreme inlet, working chamber, motor chamber and the liquid outlet of having set gradually down, encircles the barrel runner that the motor chamber was provided with a plurality of intercommunication working chambers and liquid outlet on the inside wall of the pump body, and the barrel runner includes first lateral wall and second lateral wall, and first lateral wall and second lateral wall are the curved surface structure of homonymy slope. The cylinder runner formed by the curved surface structure can change the liquid pressurized by the working cavity from rotary flow to axial flow, and the liquid pressurized by the working cavity can smoothly flow out from the liquid outlet along the direction of the cylinder runner. In the turning process, the axial length of the cylinder runner is far greater than that of a guide vane ring in a traditional immersed pump, so that energy loss can be reduced, and the working efficiency of the immersed pump is improved.

Description

Low-temperature immersed pump with guide flow channel on shell

Technical Field

The invention relates to the technical field of immersed pumps, in particular to a low-temperature immersed pump with a guide flow channel on a shell.

Background

And (4) conveying and pressurizing the liquefied natural gas by using an immersed pump in a multi-choice mode in the conveying process. The immersed pump is a common low-temperature liquid output device, and the device installs pump and motor in sealed metal container, can accomplish zero leakage, avoids producing explosive environment, can effectively eliminate the condition of igniting, guarantees the transportation safety. The working efficiency of the conventional immersed pump of the same type is generally lower than 50%, and the conventional immersed pump belongs to a pump body with lower working efficiency in the field of centrifugal pumps, which indicates that the kinetic energy loss of liquid in the working process of the conventional immersed pump is large. Research shows that the biggest reason for the low working efficiency of the immersed pump is that the kinetic energy loss of liquid in the process of changing the flow direction for many times is large, so that the inflow and the outflow of the liquid are limited, and the pump efficiency is low.

Disclosure of Invention

The invention aims to provide a low-temperature immersed pump with a guide flow channel on a shell, which aims to solve the technical problem of low working efficiency of the immersed pump in the prior art and improve the working efficiency of the immersed pump.

In order to achieve the purpose, the invention provides a low-temperature immersed pump with a guide flow channel on a shell, which comprises a pump body, wherein a liquid inlet, a working cavity, a motor cavity and a liquid outlet are sequentially arranged on the pump body from bottom to top, a plurality of barrel flow channels communicated with the working cavity and the liquid outlet are arranged on the inner side wall of the pump body around the motor cavity, each barrel flow channel comprises a first side wall and a second side wall, and the first side wall and the second side wall are both curved surface structures inclined at the same side.

The side wall of the barrel flow channel which is communicated with the working cavity and the liquid outlet is of a curved surface structure, so that smooth turning of liquid flowing out of the working cavity can be effectively realized, namely the barrel flow channel extending along the curved surface can turn the liquid pressurized by the working cavity into axial flow from rotary flow, and the liquid flows out of the liquid outlet smoothly along the barrel flow channel. In the turning process, the axial length of the flow channel in the motor shell is far greater than that of a guide vane ring in a traditional immersed pump, so that the energy loss in the liquid guiding process can be greatly reduced, and the working efficiency of the immersed pump is improved.

In the above technical solution, preferably, the cylinder flow channel includes a curved channel and a straight channel, wherein the curved channel is communicated with the working cavity, and the straight channel is communicated with the liquid outlet.

The liquid is turned by the cylinder curved channel, and the turned liquid flows to the liquid outlet along the straight channel.

In the above technical solution, preferably, an included angle between the liquid inlet end of the cylinder flow channel and the horizontal plane is α < 15 °.

Because the liquid flows into the curved channel under the condition of rotary flow, when the included angle between the liquid inlet end of the curved channel and the horizontal plane is smaller, the liquid can be helped to flow into the curved channel better, and the flow loss of the liquid is reduced.

In the above technical solution, preferably, the working chamber is provided with a plurality of impellers and a plurality of guide vane rings, the plurality of impellers are sequentially arranged along the axial direction of the working chamber, and the guide vane rings are distributed between two adjacent impellers;

the liquid flowing into the working cavity through the liquid inlet flows to the guide vane ring after being pressurized by the impeller and flows into the next stage of impeller under the guidance of the guide vane ring.

The low-temperature liquid flowing into the working chamber flows into the guide vane ring under the pressurization treatment of the impeller and flows into the inlet of the next-stage impeller under the guidance of the guide vane ring. In this process, a pressurized treatment of the cryogenic liquid is achieved.

In the above technical solution, preferably, the impeller is a hollow structure, and includes an impeller body and blades located inside the impeller body;

the blades extend towards the outer side of the impeller body along the axial direction of the impeller body, an impeller liquid inlet is formed in the side wall of the middle of the impeller body adjacent to each other, an impeller liquid outlet is formed in the peripheral side of the impeller body, and the impeller liquid inlet is communicated with the impeller liquid outlet.

The impeller consists of a front cover plate, a rear cover plate and blades, the blades are uniformly distributed between the front cover plate and the rear cover plate of the impeller, and the front cover plate, the rear cover plate and the blades form a plurality of liquid circulating channels; the low-temperature liquid flows into the impeller through the liquid inlet of the impeller positioned in the middle of the impeller and then flows out through the liquid outlet of the impeller positioned on the outer peripheral side of the impeller, and in the process, the impeller rotates at a high speed so that the mechanical energy of the impeller is converted into the mechanical energy of the low-temperature liquid, and meanwhile, the flowing direction of the liquid is changed.

In the above technical solution, preferably, the vane ring is an annular structure fixedly disposed on the inner side wall of the pump body, and a part of the outer side wall of the annular structure is recessed toward the axial direction of the pump body to form a plurality of vane ring flow channels communicating the upper and lower spaces of the vane ring, and the vane ring flow channels are uniformly distributed on the vane ring; the low-temperature liquid is processed by the impeller and then flows through the guide vane ring flow channel to enter the next stage of the impeller.

The low-temperature liquid flows to the next-stage impeller through the guide vane ring flow channel on the outer side wall of the guide vane ring, and in the process, the liquid is converted into axial flow from the rotary flow in the circumferential direction, and meanwhile, part of kinetic energy of the liquid is converted into pressure energy.

In the above technical solution, preferably, the guide vane ring flow channel is obliquely arranged from bottom to top and gradually increases in width.

The cross-sectional area of the guide vane ring flow passage is gradually increased, so that the speed of the liquid flowing through the guide vane ring flow passage is gradually reduced, and part of kinetic energy is converted into pressure energy.

In the above technical scheme, preferably, a stator and a rotor shaft are arranged in the motor cavity, and the rotor shaft penetrates through the motor cavity to be connected with an impeller located in the working cavity and drive the impeller to rotate.

When the motor is started, the rotor shaft drives the impeller to rotate, so that liquid flowing into the working cavity through the liquid inlet can be gradually conveyed to the flow channel, and meanwhile, the mechanical energy of the impeller can be converted into mechanical energy of the liquid through rotation of the impeller, so that the pressure of the liquid is increased and a certain flow speed is achieved.

In the above technical scheme, preferably, the top of the motor cavity is provided with an upper port bearing filter frame, and the upper port bearing filter frame is provided with an upper port bearing backflow hole.

In the above technical solution, preferably, an inducer is further disposed between the liquid inlet and the working chamber, and is used for enabling the immersed pump to have better cavitation resistance, and liquid at the liquid inlet flows into the working chamber under the action of the inducer; the inducer comprises an inducer rotating shaft and inducer spiral sheets, wherein the number of the inducer spiral sheets is multiple, and the inducer spiral sheets are spirally distributed on the periphery of the inducer rotating shaft from head to tail along the length direction of the inducer rotating shaft.

In the above technical scheme, preferably, a filtering device is further arranged at the liquid inlet.

Compared with the prior art, the invention provides the low-temperature immersed pump with the guide flow channel on the shell, the upper end and the lower end of the pump body of the immersed pump are respectively provided with the liquid outlet and the liquid inlet, the liquid inlet is connected with the liquid outlet through the working cavity and the flow channel, the middle part of the flow channel is provided with the motor cavity, the motor in the motor cavity is connected with the impeller in the working cavity through the rotor shaft to drive the impeller to rotate to convey liquid, the liquid is respectively pressurized and treated by the two impellers and then flows to the liquid outlet through the flow channel, the side wall of the flow channel is of a curved surface structure, the effect of conveying the liquid can be realized, the liquid flowing out through the impeller can be changed in direction, the energy loss of the liquid in the flowing process can be reduced as much as possible.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a cryogenic immersed pump with a guide flow channel in the housing of the invention;

FIG. 2 is a schematic view of the inner side wall of the pump body of FIG. 1;

FIG. 3 is a schematic view of a horizontal projection of a cylinder flow channel on the inner side wall of the pump body in FIG. 1;

FIG. 4 is a schematic cross-sectional view of the flow passage portion of the cartridge of FIG. 1;

FIG. 5 is a schematic view of the construction of the working chamber portion of FIG. 1;

FIG. 6 is a schematic view of the guide vane ring of FIG. 1;

FIG. 7 is a schematic structural view of the impeller of FIG. 1;

FIG. 8 is an axial cross-sectional view of the impeller of FIG. 1;

FIG. 9 is a schematic structural diagram of the inducer of FIG. 1;

FIG. 10 is a graph of the performance of the cryogenic submersible pump with a guide flow channel in the housing of the present invention.

In the figure: 1. a liquid outlet; 2. a motor cavity; 21. a rotor shaft; 22. an upper port bearing filter frame; 23. an upper port bearing return hole; 3. a working chamber; 31. an impeller; 311. an impeller body; 312. a blade; 313. a liquid inlet of the impeller; 314. an impeller liquid outlet; 32. a guide vane ring; 321. a guide vane ring flow channel; 4. a liquid inlet; 5. a cylinder runner; 501. a first side wall; 502. a second side wall; 51. a curve path; 52. straight path; 6. an inducer; 61. an inducer rotating shaft; 62. inducer spiral piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate orientations or positional relationships based on those shown in fig. 1, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention.

FIG. 1 is a schematic cross-sectional view of a cryogenic immersed pump with a guide flow channel in the housing of the invention; as can be clearly seen from the figure, the upper end and the lower end of the pump body are respectively provided with a liquid outlet and a liquid inlet, wherein the pump body mainly comprises a working cavity, a motor cavity and a flow channel, low-temperature liquid flows into the working cavity through the liquid inlet under the action of the inducer, a plurality of impellers are arranged in the working cavity along the axial direction, annular guide vane rings are arranged between adjacent impellers, and the liquid flowing into the working cavity through the inducer flows to the cylinder flow channel under the guide of the impellers and the guide vane rings and flows out of the liquid outlet at the top of the pump body through the cylinder flow channel; it should be noted that the barrel runner is located the inside wall of the pump body, and the pump body is inside to be provided with a motor chamber, and the rotor shaft stretches out and with impeller and inducer fixed connection that are located the work intracavity from the motor chamber lower extreme, and when the motor started, impeller and inducer can rotate under the drive of rotor shaft.

FIG. 2 is a schematic structural view of the inner side wall of the pump body in FIG. 1; the inner side wall of the pump body is provided with a plurality of uniformly distributed barrel runners along the axial direction, the barrel runners are sunken relative to the side wall of the pump body so as to form a barrel runner which extends along a curved surface and is used for low-temperature liquid to flow out, and two side walls of the barrel runners are both of curved surface structures; the cylinder flow passage consists of curved passages and straight passages, wherein all the curved passages incline towards the same side and are similar to a spiral line structure.

FIG. 3 is a schematic view of a horizontal projection of a cylinder flow channel on the inner side wall of the pump body in FIG. 1, the structure between two adjacent cylinder flow channels is a guide vane, the width of the guide vane between two adjacent curved channels is gradually increased along the flow direction of liquid, the width of the guide vane between two adjacent straight channels is unchanged, and in addition, as can be seen from the figure, the included angle between the guide vane and the horizontal plane is α.

FIG. 4 is a schematic cross-sectional view of the flow passage portion of the cartridge of FIG. 1; as can be seen from the figure, nine cylinder runners are uniformly distributed along the inner side wall of the pump body.

FIG. 5 is a schematic structural view of a portion of the working chamber of FIG. 1; as can be seen from the figure, the impellers are arranged in the working cavity along the axial direction, the guide vane rings are positioned in the middle parts of the adjacent impellers, the liquid flowing into the working cavity under the action of the inducer flows to the guide vane rings through the impellers positioned below the guide vane rings and flows to the impellers positioned above the guide vane rings under the action of the guide vane rings, and finally flows to the inlet of the cylinder flow passage under the pressure conveying of the impellers and flows out through the cylinder flow passage; the guide vane ring is fixedly connected with the first-stage inner guide shell, and the two impellers and the inducer are connected with the rotor shaft and rotate under the driving of the rotor shaft.

FIG. 6 is a schematic view of the vane ring of FIG. 1; the guide vane ring is of an annular columnar structure, guide vane ring runners for performing direction changing treatment on liquid are uniformly distributed on the outer periphery of the guide vane ring, the guide vane ring runners are of a spiral linear structure extending along the axis direction, the spiral directions of all the guide vane ring runners are the same, and the guide vane ring is fixedly installed on the inner side of the first-stage outer guide shell; the liquid pressurized by the impeller flows out in a rotating mode along the horizontal direction and then collides with the first-stage outer guide shell, then changes direction through a guide vane ring flow passage on the guide vane ring and flows axially along the direction of the guide vane ring flow passage so as to enter the next-stage impeller.

FIG. 7 is a schematic structural view of the impeller of FIG. 1; the impeller comprises an impeller body and blades, wherein the impeller body consists of a front cover plate, a rear cover plate and the blades, the front cover plate and the rear cover plate are connected through guide pillars to form the impeller body, the blades are uniformly distributed between the front cover plate and the rear cover plate of the impeller, a central hub part (namely the guide pillars) is cylindrical, the central hub part is fixedly connected with a rotor shaft through a square key, an impeller liquid inlet is formed in the middle of the impeller body, and an impeller liquid outlet is formed in the periphery of the impeller body.

FIG. 8 is an axial cross-sectional view of the impeller of FIG. 5; as can be clearly seen from the figure, the blades are located between the front cover plate and the rear cover plate and extend from the impeller liquid inlet or the vicinity of the impeller liquid inlet to the impeller liquid outlet along the axial direction, and the blades in the impeller at the moment are arc-shaped or spiral.

FIG. 9 is a schematic structural diagram of the inducer of FIG. 1; three spiral inducer spiral sheets are uniformly distributed on the inducer along the axis direction.

FIG. 10 is a performance curve of the cryogenic submersible pump with a guide flow channel in the housing of the present invention; the relationship between the immersed pump lift and the immersed pump working efficiency can be seen from the figure.

The invention provides a low-temperature immersed pump with a guide flow channel on a shell, which comprises a pump body, wherein the pump body is sequentially provided with a liquid inlet 4, a working cavity 3, a motor cavity 2 and a liquid outlet 1 from bottom to top, the inner side wall of the pump body is provided with a plurality of barrel flow channels 5 communicated with the working cavity 3 and the liquid outlet 1 around the motor cavity 2, and the barrel flow channels 5 are uniformly distributed on the inner side wall of the pump body. The overall structure of the pump body is shown in fig. 1.

It should be noted that, unlike the conventional dc flow channel, the cylinder flow channel 5 is composed of a curved surface with a certain radian: the first side wall 501 and the second side wall 502 are respectively arranged at two sides of the cylinder flow channel 5, and the first side wall 501 and the second side wall 502 are both curved surface structures inclined towards the same side, as shown in fig. 2-3.

The side wall of the cylinder runner 5 which is provided with the communicated working cavity 3 and the liquid outlet 1 is of a curved surface structure, so that smooth turning of liquid flowing out of the working cavity 3 can be effectively realized, namely the cylinder runner 5 with the curved surface can turn the liquid flowing in a rotating mode pressurized by the working cavity 3 into radial flowing, and the liquid flows out of the liquid outlet 1 along the direction of the cylinder runner 5. In the direction changing process, the axial length of the cylinder runner 5 is far greater than the height of the guide vane ring 32 in the traditional immersed pump, so that the energy loss of low-temperature liquid in the liquid guiding process can be greatly reduced, and the working efficiency of the immersed pump is improved.

As an alternative embodiment, the cylinder flow channel 5 includes a curved channel 51 and a straight channel 52, where the curved channel 51 communicates with the working chamber 3, and the straight channel 52 communicates with the liquid outlet 1, as shown in fig. 2, the curved channel 51 in the figure can change the direction of the liquid, change the rotational flow of the liquid flowing out from the working chamber 3 into an axial flow, and the changed liquid flows to the liquid outlet 1 along the straight channel 52.

Since the liquid will have a certain energy loss when changing direction, in order to reduce the loss as much as possible, as an alternative embodiment, the liquid inlet end of the cylinder flow channel 5 is arranged at an angle of α < 15 ° with the horizontal plane.

Because the liquid flows into the curved channel 51 under the condition of rotating flow, when the included angle between the liquid inlet end of the curved channel 51 and the horizontal plane is smaller, the liquid can be helped to flow into the curved channel 51 better, and the flow loss of the liquid is reduced.

Specifically, the included angle α may be 10 ° or 12 °.

Nine cylinder runners 5 are arranged on the inner side wall of the pump body, as shown in fig. 4.

The liquid in the pump body flows through the working chamber 3 into the barrel flow channel 5, during which the liquid needs to be diverted from a rotational flow to an axial flow, and thus a part of the kinetic energy needs to be lost during this process. Conventional submersible pumps redirect the flow through the vane ring 32, and the shape of the vane ring 32 therefore determines the amount of energy lost. Because the length of the guide vane ring 32 in the axial direction is short, the cryogenic liquid needs to change direction in a short flow path, so that the curvature of a liquid guide area (namely, a channel for the cryogenic liquid to pass through and located on the outer peripheral side of the guide vane ring 32) on the guide vane ring 32 is large, and the cryogenic liquid still has large rotary flow in the horizontal direction when flowing out through the guide vane ring 32, so that the kinetic energy loss of the liquid in the subsequent flow is large. The length of a liquid guiding area required by liquid turning is prolonged, so that liquid flowing loss can be effectively reduced, and the working efficiency of the submersible pump is improved. Therefore, the cylinder runner 5 is processed on the inner side wall of the pump body, so that the turning function can be achieved, the axial size of the pump body is effectively utilized, the axial length of a fluid turning area is increased under the condition that the size of the pump body is not increased, the working efficiency of the pump body is greatly improved, and the structure of the pump body is simpler and more reasonable.

The cylinder flow passage 5 may have other shapes, and the specific shape of the cylinder flow passage 5 is not limited to this embodiment.

As an alternative embodiment, an impeller 31 and a guide vane ring 32 are fixedly arranged on the inner side wall of the working chamber 3, the number of the impellers 31 is multiple, the impellers 31 are sequentially arranged along the axial direction of the working chamber 3, and the guide vane ring 32 is distributed between two adjacent impellers 31, as shown in fig. 5; the impeller 31 below the guide vane ring 32 is defined as a first-stage impeller 31, the impeller above the guide vane ring 32 is defined as a second-stage impeller 31, and the liquid flowing into the working chamber 3 through the liquid inlet 4 flows to the guide vane ring 32 after being pressurized by the first-stage impeller 31 and flows into the second-stage impeller 31 under the guidance of the guide vane ring 32, and then flows out through the cylinder runner 5 after being pressurized by the second-stage impeller 31.

Specifically, this working chamber 3 leads casing and second grade outward in leading casing, the one-level outward in leading casing, second grade including the one-level in leading casing, four casings meet in proper order and constitute working chamber 3, wherein lead casing and one-level outward in the one-level and lead the casing and constitute the one-level cavity, lead casing and second grade outward in the second grade and lead the casing and constitute the second grade cavity, one-level impeller 31 is located the one-level cavity, and second grade impeller 31 is located the second grade cavity.

The motor cavity 2 is positioned right above the working cavity 3, a stator and a rotor shaft 21 are arranged in the motor cavity 2, and the rotor shaft 21 penetrates through the motor cavity 2 to be connected with a primary impeller 31 and a secondary impeller 31 which are positioned in the working cavity 3 and drive the primary impeller 31 and the secondary impeller 31 to rotate.

When the motor is started, the rotor shaft 21 drives the first-stage impeller 31 and the second-stage impeller 31 to rotate, so that liquid flowing into the working cavity 3 through the liquid inlet 4 can be gradually conveyed to the position of the cylinder runner 5, and meanwhile, the mechanical energy of the impellers can be converted into the pressure energy and the kinetic energy of the liquid through the rotation of the first-stage impeller 31 and the second-stage impeller 31, so that the liquid has a certain flow velocity, and the conveying efficiency of the pump body is improved.

The low-temperature liquid flowing into the working chamber 3 firstly enters the first-stage impeller 31, the first-stage impeller 31 rotates at a high speed under the drive of the rotor shaft 21, the low-temperature liquid flows into the guide vane ring 32 after being subjected to energy extraction treatment by the first-stage impeller 31, in the process, mechanical energy generated by high-speed rotation of the impeller is converted into mechanical energy (namely pressure energy and kinetic energy) of the liquid, the low-temperature liquid is converted into flow along the axial direction from horizontal plane rotating flow when flowing through the guide vane ring 32, then the low-temperature liquid flows to the second-stage impeller 31 from the guide vane ring 32, and the second-stage impeller 31 is used for pressurizing the low-temperature liquid again.

As an alternative embodiment, the impeller 31 is a hollow structure, and includes an impeller body 311 and blades 312 located inside the impeller body 311; the plurality of blades 312 extend toward the outer side of the impeller body 311 along the axial direction of the impeller body 311, an impeller inlet 313 is formed on the side wall of the middle part of the impeller body 311 in adjacent blades 312, an impeller outlet 314 is formed on the outer peripheral side of the impeller body 311, and the impeller inlet 313 is communicated with the impeller outlet 314.

Specifically, the impeller 31 includes a front cover plate, a rear cover plate, and a front cover plate and a rear cover plate connected by a guide post to form the impeller body 311, a space exists between the front cover plate and the rear cover plate, the blades 312 are divided in the space, and all the blades 312 are connected to the front cover plate and the rear cover plate, as shown in fig. 7-8. The plurality of blades 312 are distributed in the middle of the impeller, and two adjacent blades 312 and the impeller body 311 form a channel for the low-temperature liquid to pass through together, so that when the impeller 31 rotates, the low-temperature liquid flows into the impeller 31 through the impeller liquid inlet 313 in the middle of the impeller 31 and flows along the channel under the action of centrifugal force generated by rotation of the impeller 31, and then flows out through the impeller liquid outlet 314 on the outer circumferential side of the impeller 31, in the process, the impeller 31 rotates at high speed, so that the mechanical energy of the impeller is converted into the mechanical energy of the low-temperature liquid, centrifugal conveying of the liquid is realized, and meanwhile, the flowing direction of the liquid is changed in the process.

It should be noted that any two impeller inlet openings 313 on the impeller 31 have the same shape and size, and any two impeller outlet openings 314 have the same shape and size, and the blades 312 are distributed on the impeller body 311 and extend from the impeller inlet opening 313 or the vicinity thereof to the impeller outlet opening 314.

The arrangement of the vanes 312 in fig. 8 can ensure that the cross-sectional area of the liquid inlet 313 of the impeller is large, and simultaneously, the uniform split flow of the liquid can be effectively realized, so that the slow liquid inlet speed of the immersed pump or the large impact of the liquid on the pump body can be avoided.

Specifically, an included angle is formed between the extension line of the blade 312 and the outer tangent of the impeller body 311, the included angle is greater than 20 degrees and less than 38 degrees, and the optimal included angle is 36 degrees, at this time, the working efficiency of the impeller 31 is the greatest.

Specifically, ten impeller liquid outlets 314 are arranged on the outer peripheral side of the impeller 31, and correspondingly, nine cylinder flow channels 5 are arranged on the inner side wall of the pump body, and it should be noted that the number of the impeller liquid outlets 314 is different from the number of the cylinder flow channels 5.

As an alternative embodiment, the vane ring 32 is an annular structure fixedly disposed on the inner sidewall of the pump body, as shown in fig. 6, a part of the outer sidewall thereof is recessed toward the axial direction of the pump body to form a plurality of vane ring flow passages 321 communicating the upper and lower spaces of the vane ring 32, and the vane ring flow passages 321 are uniformly distributed on the vane ring 32; the low-temperature liquid is processed by the impeller 31 and then flows through the vane ring flow passage 321 to enter the next-stage impeller 31.

Note that the vane ring flow passage 321 extends in a spiral direction and the inclination direction of the vane ring flow passage 321 is the same as the inclination direction of the cylinder flow passage 5. The spiral vane ring flow channel 321 facilitates the collection of the liquid by the vane ring 32 and reduces the energy loss caused by the direction change of the liquid as much as possible, so that the liquid (rotating flow in the horizontal direction) thrown out by the first-stage impeller 31 can smoothly flow into the vane ring flow channel 321 and be sucked and pressurized by the next impeller. Meanwhile, the guide vane ring flow passage 321 arranged obliquely helps to reduce the impact of the liquid flow on the pump body and reduce the energy loss of the liquid, so that higher working efficiency is obtained.

As an alternative embodiment, the angle of inclination of vane ring flow passage 321 extending in the direction of the spiral line with respect to the circumferential axis of the pump body is 2 to 8 degrees.

Specifically, nine vane ring flow passages 321 are uniformly distributed around the vane ring 32 for allowing liquid to flow through.

Specifically, all the guide vane ring flow passages 321 have the same cross-sectional structure, and the cross-sectional structure may be a rectangle, or may be a plurality of structures such as a triangle, a semicircle, or a sector.

The cryogenic liquid flows to the next-stage impeller 31 through the vane ring flow passage 321 on the outer side wall of the vane ring 32, and in the process, the liquid is partially converted into axial flow from the rotary flow in the circumferential direction, and part of the kinetic energy of the liquid is converted into pressure energy.

Alternatively, the vane ring channel 321 is inclined from bottom to top and gradually increases in width or the cross-sectional area of the vane ring channel 321 gradually increases from bottom to top.

During the flowing process of the cryogenic liquid, because the cross-sectional area of the vane ring flow passage 321 is gradually increased, the flow velocity of the liquid is gradually reduced, and part of the kinetic energy of the cryogenic liquid during the flowing process is converted into pressure energy.

By analogy, the liquid enters the next stage of pressurization process by the same principle.

In an actual production process, the number of the vane ring 32 may be plural.

As an optional implementation mode, an inducer 6 is further arranged between the liquid inlet 4 and the working cavity 3, and liquid at the liquid inlet flows into the working cavity 3 under the action of the inducer 6; the inducer 6 includes an inducer rotating shaft 61 and inducer helical pieces 62, as shown in fig. 9, the number of the inducer helical pieces 62 is plural, and the plural inducer helical pieces 62 are spirally distributed on the circumference side of the inducer rotating shaft 61 from the top to the bottom along the length direction of the inducer rotating shaft 61.

Specifically, the inducer helix pieces 62 on the inducer 6 are three in number.

In addition, a filtering device is arranged at the liquid inlet 4 and used for filtering low-temperature liquid, so that components in the working cavity 3 are prevented from being damaged by impurities possibly existing in the liquid.

As an optional implementation manner, an upper port bearing filter frame 22 is arranged at the top of the motor cavity 2, an upper port bearing return hole 23 is arranged on the upper port bearing filter frame 22, the upper port bearing return hole 23 is located in the middle of the upper port bearing filter frame 22, and low-temperature liquid can flow through the upper port bearing return hole 23 to the outside of the motor cavity and lubricate the upper port bearing and cool the upper port bearing and the motor. Therefore, the rotor shaft 21 can be driven to rotate and output mechanical energy by using a common motor.

As an alternative implementation manner, the motor used by the low-temperature immersed pump in this embodiment may also be an ultra-low-temperature rare earth permanent magnet synchronous motor, and the stator used by the motor is a permanent magnet stator.

Compared with a three-phase asynchronous machine with the same power, the ultralow-temperature rare earth permanent magnet synchronous motor has the advantages of small volume, light weight, high efficiency and high reliability. The reduction of the volume of the motor ensures that the appearance of the pump body is not limited by the size of the motor and can be more flexible.

In this case, the working efficiency of the immersed pump is as shown in fig. 10, and the working efficiency of the immersed pump after improvement is improved by 3% compared with the immersed pump without improvement.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. The utility model provides a casing has low temperature immersed pump of direction runner, a serial communication port, which comprises a pump body, the pump body is by supreme inlet (4), working chamber (3), motor chamber (2) and the liquid outlet (1) of having set gradually down, encircle on the inside wall of the pump body motor chamber (2) are provided with a plurality of intercommunications working chamber (3) with barrel runner (5) of liquid outlet (1), barrel runner (5) include first lateral wall (501) and second lateral wall (502), first lateral wall (501) with second lateral wall (502) are the curved surface structure of homonymy slope.

2. Cryogenic immersed pump with a guide flow channel for a housing according to claim 1, characterized in that the cylinder flow channel (5) comprises a curved channel (51) and a straight channel (52), wherein the curved channel (51) communicates with the working chamber (3) and the straight channel (52) communicates with the liquid outlet (1).

3. Cryogenic submersible pump with guided flow channels in the housing according to claim 1 or 2, characterized in that the angle between the inlet end of the cylinder flow channel (5) and the horizontal is α < 15 °.

4. The cryogenic immersed pump with the guide flow channel in the shell is characterized in that an impeller (31) and a guide vane ring (32) are arranged in the working cavity (3), the number of the impellers (31) is multiple, the impellers (31) are sequentially arranged along the axial direction of the working cavity (3), and the guide vane ring (32) is distributed between two adjacent impellers (31);

the liquid flowing into the working cavity (3) through the liquid inlet (4) is pressurized by the impeller (31) and then flows to the guide vane ring (32) and flows into the inlet of the next-stage impeller (31) under the guidance of the guide vane ring (32).

5. The cryogenic immersed pump with a guide flow channel for a shell according to claim 4, characterized in that the impeller (31) is a hollow structure and comprises an impeller body (311) and blades (312) positioned inside the impeller body (311);

the plurality of blades (312) extend towards the outer side of the impeller body (311) along the axial direction of the impeller body (311), an impeller liquid inlet (313) is formed in the side wall of the middle of the impeller body (311) of the adjacent blades (312), an impeller liquid outlet (314) is formed in the outer peripheral side of the impeller body (311), and the impeller liquid inlet (313) is communicated with the impeller liquid outlet (314).

6. The cryogenic immersed pump with guide flow channel in shell according to claim 4 is characterized in that the guide vane ring (32) is an annular structure fixedly arranged on the inner side wall of the pump body, part of the outer side wall of the annular structure is recessed towards the axial direction of the pump body so as to form a plurality of guide vane ring flow channels (321) communicating the upper space and the lower space of the guide vane ring (32), and the guide vane ring flow channels (321) are uniformly distributed on the guide vane ring (32); the low-temperature liquid is processed by the impeller (31) and then flows through the guide vane ring flow passage (321) to enter the next-stage impeller (31).

7. Cryogenic immersed pump with guide flow channel in housing according to claim 6, characterized in that the guide vane ring flow channel (321) is arranged obliquely from bottom to top and gradually increases in width.

8. Cryogenic immersed pump with guided flow channels in the housing according to claim 4, characterized in that a stator and a rotor shaft (21) are arranged in the motor chamber (2), the rotor shaft (21) passing through the motor chamber (2) and being connected to an impeller located in the working chamber (3) and driving the impeller (31) in rotation.

9. The cryogenic immersed pump with the guide flow channel in the shell as claimed in claim 1, wherein an inducer (6) is further disposed between the liquid inlet (4) and the working chamber (3), and the liquid at the liquid inlet (4) flows into the working chamber (3) under the action of the inducer (6); the inducer (6) comprises an inducer rotating shaft (61) and inducer spiral sheets (62), the number of the inducer spiral sheets (62) is multiple, and the inducer spiral sheets (62) are spirally distributed on the periphery of the inducer rotating shaft (61) from top to bottom along the length direction of the inducer rotating shaft (61).

10. Cryogenic immersed pump with a guide flow channel in the housing according to claim 9, characterised in that a filter device is arranged at the liquid inlet (4).