CN111237196A

CN111237196A - Novel two-end supporting low-vibration efficient double-suction rotary shell pump

Info

Publication number: CN111237196A
Application number: CN202010001222.0A
Authority: CN
Inventors: 贾晓奇; 李松宇; 郑红海; 缪宏江; 袁静; 袁升; 朱祖超
Original assignee: HANGZHOU DALU INDUSTRIAL CO LTD; Zhejiang Sci Tech University ZSTU
Current assignee: HANGZHOU DALU INDUSTRIAL Co.,Ltd.
Priority date: 2020-01-02
Filing date: 2020-01-02
Publication date: 2020-06-05
Anticipated expiration: 2040-01-02
Also published as: CN111237196B

Abstract

The invention discloses a novel double-end-support low-vibration efficient double-suction rotary shell pump. The pump comprises a pump shell, a main shaft, a collecting pipe and a shunting inner shell, wherein the shunting inner shell is internally provided with a rotor cavity shell sleeved outside the collecting pipe and the main shaft; an annular flow passage is formed between the impeller and the rotor cavity shell, a horizontal flow passage is formed between the collecting pipe and the main shaft and the rotor cavity shell, a rotor cavity is formed between the left impeller and the right impeller, and fluid flows into the two vertical flow passages between the flow dividing inner shell and the pump outer shell after flowing into the liquid inlet at the top end of the pump outer shell; then flows into the rotor cavity after sequentially passing through the respective horizontal flow channel and the annular flow channel; the collecting pipe diameter part is provided with a bending part which is reversed along the flow direction and flows out after entering the hollow channel through the bending part. The invention improves the maximum flow of the pump, improves the inherent frequency of the pump, effectively solves the problem of vibration noise of the pump, also improves the maximum power of the pump and prolongs the service life.

Description

Novel two-end supporting low-vibration efficient double-suction rotary shell pump

Technical Field

The invention relates to a rotary shell pump, in particular to a novel double-end-supported low-vibration efficient double-suction rotary shell pump for fluid conveying in the fields of petrochemical industry, papermaking, food and the like.

Background

The rotary shell pump is a single-stage, cantilever type, small-flow and high-lift pump, is mainly applied to the fields of petrochemical industry, papermaking, food and the like at present, and is used for conveying clean liquid or liquid containing solid particles. Since the rotary shell pump has the advantages of simple structure, small volume, stable operation, low rotating speed, good cavitation resistance and good sealing performance, and the good reputation and the strong subsequent development in the fields, the rotary shell pump is widely applied. The rotary shell pump is a liquid delivery pump of a drilling and flushing system and a feeding pump of a carbon black production line in the automobile manufacturing industry at present, and is a first-choice device in the deep well waste treatment field of a chemical plant, and a standard matching device of a high-pressure cleaning system in food processing, manufacturing workshops, paper making industry and the like.

The single suction cantilever type pump has excellent performance in the practical engineering application, but the defects of the single suction cantilever type pump are also found in the practical use process, and the structural characteristics of the single suction cantilever type pump limit the maximum flow rate in the use process and the stability in operation. Under the technical background and in combination with the problems encountered in practical production, the invention provides technical improvements and optimizations aiming at the defects of the single-suction small-flow and cantilever type shell rotary shell pump, and invents a novel double-suction rotary shell pump with two-end support and low vibration and high efficiency.

Disclosure of Invention

In order to overcome the defects of the existing rotary shell pump in the background technology, the invention aims to provide a novel double-end-supported low-vibration high-efficiency double-suction rotary shell pump which can be used for fluid conveying in the fields of petrochemical industry, papermaking, food and the like. Compared with the traditional rotary shell pump, the rotary shell pump has the advantages that the maximum conveying flow of the rotary shell pump is improved, the inherent frequency of the rotary shell pump is improved, the problem of vibration noise of the rotary shell pump is effectively solved, the maximum power of the rotary shell pump is improved, and the service life of the rotary shell pump is prolonged.

The technical scheme adopted by the invention is as follows:

the invention comprises a main shaft, a pump shell, a left impeller, a rotor cavity shell, a collecting pipe and a right impeller; the main shaft and the collecting pipe are installed in the cavity inside the pump shell, the collecting pipe comprises a shaft portion and a diameter portion, one end of the shaft portion and one end of the diameter portion are connected to form an L shape, the shaft portion and the main shaft of the collecting pipe extend into the pump shell from two sides of the pump shell respectively, the shaft portion and the main shaft of the collecting pipe are coaxially and oppositely arranged, and the diameter portion of the collecting pipe is perpendicular to the shaft portion and extends in the radial direction from the end portion of the shaft.

A liquid inlet is formed in the top end of the pump outer shell, a shunting inner shell is mounted in a cavity in the pump outer shell above the collecting pipe and the main shaft, gaps are respectively formed between two ends of the shunting inner shell along the axial direction of the main shaft and the inner wall of the cavity in the pump outer shell, and the two gaps are respectively used as two independent vertical flow channels; meanwhile, the top surface of the shunting inner shell is arranged to be ridge-shaped and serves as an inlet section wall surface, and fluid flows into the two vertical flow channels at the front end and the rear end of the shunting inner shell along the axial direction of the main shaft under the guiding effect of the inlet section wall surface after flowing into the shunting inner shell from the liquid inlet.

The rotor cavity shell is arranged in the inner cavities of the flow collecting pipe and the flow dividing inner shell outside the main shaft, through holes are formed in two ends of the rotor cavity shell and are respectively and coaxially arranged outside the shaft part of the sleeved flow collecting pipe and the main shaft, and the bottoms of the two ends of the rotor cavity shell and the flow dividing inner shell and the bottom of the inner cavity of the pump outer shell are in sealed rotating connection; the inner cavity of the rotor cavity shell is internally provided with a left impeller and a right impeller, the left impeller is coaxially and fixedly sleeved on the main shaft, the right impeller is coaxially and movably arranged on the shaft part of the collecting pipe, and the peripheral edges of the left impeller and the right impeller are fixedly connected to the inner peripheral surface of the rotor cavity shell, so that the rotor cavity shell, the left impeller and the right impeller form a whole and rotate around the main shaft and the shaft part of the collecting pipe.

Gaps are formed between the left impeller and the right impeller and the front and rear inner end faces of the rotor cavity shell along the axial direction of the main shaft respectively and serve as annular flow channels, gaps are formed between the shaft part of the collecting pipe and the main shaft and between the shaft parts of through holes at two ends of the rotor cavity shell respectively and serve as horizontal flow channels, the inner cavity part of the rotor cavity shell between the left impeller and the right impeller serves as a rotor cavity, the outer ring parts of the two annular flow channels corresponding to the left impeller and the right impeller are communicated with the rotor cavity through the gaps between the peripheral edges of the left impeller and the right impeller and the inner circumferential surface of the rotor cavity shell, and the inner ring parts of the two annular flow channels corresponding to the left impeller and the right impeller are communicated with the two vertical flow channels; the fluid flowing into the two vertical flow channels respectively flows into the rotor cavity after sequentially passing through the respective horizontal flow channel and the annular flow channel.

The collecting pipe diameter part is positioned in the rotor cavity, the tail end of the collecting pipe diameter part is perpendicularly bent along the tangential direction to form a bent part, and the tangential direction of the perpendicular bending of the collecting pipe bent part is opposite to the tangential direction of an hour hand rotating around the main shaft and the collecting pipe shaft part, wherein the whole body is formed by the rotor cavity shell, the left impeller and the right impeller; the collecting pipe is internally provided with a hollow passage, the hollow passage is communicated with the bent part from the shaft part of the collecting pipe through the radial part, and two ends of the hollow passage respectively penetrate through the shaft part of the collecting pipe and the end surface of the bent part; the fluid in the rotor cavity flows in through the hollow channel inlet on the end face of the bent part of the collecting pipe and flows out from the hollow channel outlet on the end face of the shaft part of the collecting pipe.

The middle part of the main shaft penetrates out of the pump shell and is sleeved in the bearing box through the bearing support, lubricating oil is filled in the bearing box, the other end of the main shaft extends out of the bearing box and is coaxially connected with an output shaft of the motor through the coupler, and the motor drives the main shaft to rotate under the support of the bearing and carries out self-lubrication through the lubricating oil in the bearing box.

The top of the bearing box is provided with an oil filling through hole, an oil plug is arranged in the oil filling through hole, and an oil pointer is arranged at the bottom of the bearing box.

The left impeller and the main shaft are coaxially connected in a sleeved mode through a round-head flat key.

The wall surface of the inlet section is used as a flow channel of a fluid medium, and the surface of the inlet section is subjected to smoothing treatment and corrosion prevention treatment.

The end faces of the through holes at the two ends of the rotor cavity shell are respectively and hermetically connected with the bottoms at the two ends of the shunt inner shell and the bottom of the pump outer shell in a rotating mode through fillers.

And a felt ring is connected and installed between the main shaft and the pump shell for sealing.

The rotor cavity shell is characterized by further comprising a pump shell body, a pump shell body is installed in an inner cavity of the shunting inner shell, the pump shell body is sleeved outside the rotor cavity shell above the collecting pipe and the main shaft, the inner surface of the pump shell body is connected with the outer surface of the rotor cavity shell in a rotating matching mode, and two ends of the rotor cavity shell are axially fixed under the action of the pump shell body for fixing and supporting.

The rotor cavity shell, the left impeller and the right impeller are integrally cast. The main shaft is connected with the left impeller through a key, the left impeller and the right impeller are integrated with the whole rotor cavity shell, so that the left impeller and the right impeller are easier and more convenient to mount and dismount. The traditional rotary shell pump is characterized in that a rotor cavity shell and a main shaft are connected into a whole through an impeller and a shell which are connected together through screws, so that the problem that the pump cannot be conveniently disassembled and assembled is solved.

The double-suction rotary shell pump can be applied to fluid conveying in the fields of petrochemical industry, papermaking, food and the like.

The wall surface of the inlet section and the left and right flow channels of the invention mean that when fluid medium flows vertically downwards from the liquid inlet, the fluid flows into the rotor cavity from the left and right channels respectively due to the action of the wall surface of the inlet section. The left channel is formed by the main shaft and the rotor cavity shell, and the right channel is formed by the collecting pipe and the rotor cavity shell.

The two ends are fixed, namely the rotor cavity shell is fixed on the left side and the right side of the pump shell, and the two ends are fixed to the left side and the right side of the pump shell, so that the two ends are different from the traditional cantilever type shell which is only fixed on one side, the influence of axial force on machine vibration can be better eliminated, and the whole motion becomes more stable.

Fluid medium flows in through the liquid inlet, the liquid inlet is arranged in the vertical direction of the rotor cavity, a rotor cavity shell, a pump shell for fixedly supporting the rotor cavity shell at two ends, an inner cavity and an inlet section wall for flow separation are sequentially arranged between the rotor cavity and the liquid inlet from inside to outside, fluid flows and separates left and right under the action of the inlet section wall, and enters the rotor cavity rotating synchronously at high speed from left and right sides under the action of centrifugal force of left and right impellers, so that liquid around the rotor cavity has high pressure, the high-speed liquid flows into a static collecting pipe, the flow pipe is equivalent to a pressurized water chamber of a common centrifugal pump, has a pressure expansion effect, converts speed energy into pressure energy, and finally outputs high-pressure liquid through the collecting pipe.

Compared with the prior art, the invention has the beneficial effects that:

the double-suction inlet is adopted, and compared with the traditional spiral shell pump, the double-suction inlet is sensitive to cavitation during medium conveying, so that the flow velocity of the inlet is not easy to be overlarge, and the maximum flow which can be conveyed by the spiral shell pump is limited; meanwhile, the maximum delivery flow of the rotary shell pump can be increased under the same cavitation allowance requirement, the maximum delivery flow of the device is 2 times of that of the traditional rotary shell pump, and the maximum delivery flow can reach 400-³H; the double suction inlet also enables the axial force of the volute pump to be self-balancing.

This device adopts both ends to support, compares in the cantilever type of traditional spiral shell pump advantage be: the influence of large deflection caused by a cantilever on the vibration of a rotor system is eliminated, the inherent frequency of the rotary shell pump is improved, and the vibration noise problem of the rotary shell pump is effectively improved. The maximum rotating speed of the rotary shell pump can be broken through by adopting a two-end supporting mode, the maximum rotating speed of the traditional rotary shell pump is about 5000-6500 r/min, the rotating speed of the rotary shell pump can be increased to 10000-20000 r/min or even higher by adopting the structural form of the invention, the available lift of the fluid medium is higher along with the increase of the rotating speed, and the maximum lift can reach about 5000m or even higher.

Drawings

Fig. 1 is a cross-sectional view of the present invention.

FIG. 2 is a three-dimensional view of a manifold

Fig. 3 is an end view of the impeller and rotor cavity housing.

FIG. 4 is a cross-sectional view of an impeller and rotor cavity housing.

In the figure: 1. the device comprises a motor, 2, a coupler, 3, a fuel indicator, 4, a main shaft, 5, a bearing box, 6, a fuel plug, 7, a bearing, 8, a felt ring, 9, a pump shell, 10, a left horizontal flow channel, 11, a left impeller, 12, a liquid inlet, 13, an inlet section wall surface, 14, an inner cavity, 15, a pump shell, 16, a rotor cavity shell, 17, a collecting pipe, 18, a water lubrication bearing, 19, a packing seal, 20, a right horizontal flow channel, 21, a liquid outlet, 22, a right impeller, 23 and a rotor cavity.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, the specific implementation includes a main shaft 4, a pump housing 9, a left impeller 11, a rotor cavity housing 16, a collecting pipe 17 and a right impeller 22; the main shaft 4 and the collecting pipe 17 are installed in the inner cavity of the pump housing 9.

As shown in fig. 2, the collecting pipe 17 includes a shaft portion and a diameter portion, one end of the shaft portion and one end of the diameter portion are connected to form an L shape, the shaft portion and the main shaft 4 of the collecting pipe 17 respectively extend into the pump casing 9 from both sides of the pump casing 9, the shaft portion and the main shaft 4 of the collecting pipe 17 are coaxially arranged in an opposite manner but not connected, and the diameter portion of the collecting pipe 17 is arranged perpendicular to the shaft portion and extends in a radial direction from an end of the shaft portion in the pump casing 9.

A liquid inlet 12 is formed in the top end of the pump outer shell 9, a flow collecting pipe 17 and a shunting inner shell are mounted in an inner cavity of the pump outer shell 9 above the main shaft 4, the shunting inner shell divides the inner cavity of the pump outer shell 9 into two independent vertical flow channel spaces which are front and back along the axial direction of the main shaft 4, gaps are respectively formed between two ends of the shunting inner shell along the axial direction of the main shaft 4 and the inner wall of the inner cavity of the pump outer shell 9, and the two gaps are respectively used as two independent vertical flow channels; while the top surface of the inner shell of the splitter is provided as a ridge-shaped surface as the inlet section wall 13. The wall surface 13 of the inlet section is used as a flow channel of a fluid medium, the surface of the inlet section is subjected to smoothing treatment and corrosion prevention treatment, and fluid flows into the two vertical flow channels at the front end and the rear end of the inner shunting shell along the axial direction of the main shaft 4 under the guiding action of the wall surface 13 of the inlet section after flowing in from the liquid inlet 12.

A rotor cavity shell 16 is installed in inner cavities of a shunting inner shell outside a collecting pipe 17 and a main shaft 4, the rotor cavity shell 16 is of a rotating body structure with a U-shaped section, coaxial through holes are formed in two ends of the rotor cavity shell 16 and are respectively coaxial outside a shaft part of the collecting pipe 17 and the main shaft 4 in a sleeved mode, specifically, the left impeller 11 and the main shaft 4 are coaxially connected in a sleeved mode through round-head flat keys, and therefore the main shaft can be conveniently detached and installed. The bottoms of the two ends of the rotor cavity shell 16 and the shunt inner shell, and the bottom of the inner cavity of the pump outer shell 9 below the main shaft 4 and the flow collecting pipe 17 are in sealed rotary connection; as shown in fig. 3 and 4, a left impeller 11 and a right impeller 22 are arranged in the inner cavity of the rotor cavity shell 16, a distance is arranged between the left impeller 11 and the right impeller 22 along the axial direction, the rotating shafts of the left impeller 11 and the right impeller 22 are overlapped with the axial direction of the main shaft 4 and the shaft part of the collecting pipe 17, the left impeller 11 is coaxially and fixedly sleeved on the main shaft 4 through a key, and the right impeller 22 is coaxially and movably and rotatably arranged on the shaft part of the collecting pipe 17 through a water lubrication bearing 18. In specific implementation, the rotor cavity shell 16, the left impeller 11 and the right impeller 22 are integrally cast, and the radial peripheral edges of the left impeller 11 and the right impeller 22 can be fixedly connected to the inner circumferential surface of the rotor cavity shell 16 through a plurality of support rod pieces arranged at intervals along the circumference, so that the rotor cavity shell 16, the left impeller 11 and the right impeller 22 are integrally formed and rotate around the shaft part of the main shaft 4 and the collecting pipe 17.

Gaps are formed between the left impeller 11 and the right impeller 22 and the front and rear inner end faces of the rotor cavity shell 16 along the axial direction of the main shaft 4 and serve as annular flow channels, gaps are formed between the shaft part of the collecting pipe 17 and the main shaft 4 and the through hole walls at two ends of the rotor cavity shell 16 and serve as

horizontal flow channels

10 and 20, the inner cavity part of the rotor cavity shell 16 between the left impeller 11 and the right impeller 22 serves as a rotor cavity 23, as shown in fig. 3, the outer ring parts of the two annular flow channels corresponding to the left impeller 11 and the right impeller 22 are communicated with the rotor cavity 23 through the gaps formed by the edges of the left impeller 11 and the right impeller 22 and the inner circumferential surface of the rotor cavity shell 16, and the inner ring parts of the two annular flow channels corresponding to the left impeller 11 and the right impeller 22 are communicated with the two vertical flow channels through the

horizontal flow channels

10 and 20 corresponding to the shaft; the fluid flowing into the two vertical channels respectively flows into the rotor cavity 23 after passing through the respective

horizontal channels

10 and 20 and the annular channel in sequence.

The diameter part of the collecting pipe 17 is positioned in the rotor cavity 23 and is positioned in the center between the left impeller 11 and the right impeller 22, a gap is formed between the tail end of the diameter part of the collecting pipe 17 and the inner circumferential surface of the inner cavity of the rotor cavity shell 16, a gap is formed between the tail end of the diameter part of the collecting pipe 17 and the inner circumferential surface of the rotor cavity shell 16, the tail end of the diameter part of the collecting pipe 17 is perpendicularly bent along the tangential direction to form a bent part, and the tangential direction of the bent part of the; a hollow passage is formed in the collecting pipe 17, the hollow passage is communicated with the bent part from the shaft part of the collecting pipe 17 through the radial part, and two ends of the hollow passage respectively penetrate through the end faces of the shaft part and the bent part of the collecting pipe 17; the fluid in the rotor chamber 23 flows in through the hollow channel inlet on the end face of the bent part of the collecting pipe 17 and flows out from the hollow channel outlet on the end face of the shaft part of the collecting pipe 17. The hollow channel on the end face of the shaft part of the collecting pipe 17 is used as a liquid outlet 21 of the double-suction rotary shell pump.

The liquid inlet 12 makes fluid medium flow and separate under the action of the wall surface 13 of the inlet section, and the fluid medium respectively enters the rotor cavity 23 from a left flow channel and a right flow channel which are formed by sequentially connecting a left vertical flow channel, a right horizontal flow channel and an annular flow channel under the action of the left impeller 11 and the right impeller 22, so that the fluid enters the rotor cavity 23 from the left side and the right side, and finally flows out of the liquid outlet 21 through the collecting pipe 17.

As shown in fig. 1, the middle part of the main shaft 4 penetrates out of the pump housing 9 and then is supported by the bearing 7 to be sleeved in the bearing box 5, the bearing box 5 is filled with lubricating oil, the other end of the main shaft 4 extends out of the bearing box 5 and then is coaxially connected with an output shaft of the motor 1 through the coupler 2, the motor 1 drives the main shaft 4 to rotate under the support of the bearing 7, the lubricating oil passing through the bearing box 5 is self-lubricated, the lubricating oil enables the main shaft to be well lubricated and radiate in the rotating process, and meanwhile the bearing can better support and rotate the main shaft. An oil filling through hole is formed in the top of the bearing box 5, an oil plug 6 is installed in the oil filling through hole, and an oil pointer 3 is installed at the bottom of the bearing box 5. The oil pointer 3 and the oil plug 6 are arranged, so that the lubricating oil can be more conveniently added and monitored.

The hole end faces of the through holes at the two ends of the rotor cavity shell 16 are respectively and rotationally connected with the bottoms at the two ends of the shunt inner shell and the bottom of the pump outer shell 9 through packing seals 19. A felt ring 8 is installed between the main shaft 4 and the pump housing 9 for sealing.

The left main shaft and the right collecting pipe 17 are sealed by a packing seal 19 to prevent the leakage of fluid medium, so that no fluid enters the inner cavity 14 between the pump shell 15 and the shunting inner shell; the gap between the collecting pipe 17 and the right impeller 22 is filled with water flow and is connected through the water lubrication bearing 18, so that the right bearing can rotate better on one hand, and the collecting pipe and the rotor cavity can be sealed better on the other hand. And the pressure between the main shaft 4 and the pump shell 9 is not high, and the felt ring 8 seal is selected instead of the mechanical seal selected by the common rotating shell pump, so that the leakage of the fluid in operation is prevented, and the reliability of the seal is good.

As shown in fig. 1, in the specific implementation, the centrifugal pump further includes a pump housing 15, the pump housing 15 is installed in the inner cavity of the shunting inner housing, the pump housing 15 is sleeved outside the collecting pipe 17 and the rotor cavity housing 16 above the main shaft 4, the inner surface of the pump housing 15 is connected with the outer surface of the rotor cavity housing 16 in a rotating fit manner, and the two ends of the rotor cavity housing 16 are axially fixed under the action of the pump housing 15 for fixing and supporting, so that the left end and the right end of the rotor cavity housing 16 can be axially fixed well, and the stability of the rotor cavity housing 16 in the rotating process.

The invention realizes double suction of the rotary shell pump through the separation of the wall surface of the inlet section and the action of the left impeller and the right impeller, and changes the original cantilever type into the two-end fixed type through the supporting and fixing of the left end and the right end of the rotor cavity shell at the left end and the right end of the pump shell, thereby realizing the low vibration and the high efficiency of the rotary shell pump.

In specific implementation, as shown in fig. 1, the working process of the present invention is as follows:

the motor 1 is started firstly, the motor 1 is connected with the main shaft 4 through the coupler 2, lubrication can be better detected and controlled through the oil plug 6 and the oil pointer 3 in the bearing box 5, and the main shaft can better rotate and self-lubricate under the supporting action of the bearing 7.

The motor 1 operates to drive the main shaft 4 to rotate, and the main shaft 4 enters the pump shell 9 and then is connected with the left impeller 11 through the round-head flat key, so that the left impeller 11, the rotor cavity shell 16 fixedly connected with the left impeller 11 and the right impeller 22 are driven to synchronously rotate.

In the integral rotation process formed by the rotor cavity shell 16, the left impeller 11 and the right impeller 22, a fluid medium enters the interior of the pump shell 9 through the liquid inlet 12, respectively enters the left horizontal flow channel 10 at the main shaft side and the right horizontal flow channel 20 at the collecting pipe side from the vertical flow channel at the main shaft side and the vertical flow channel at the collecting pipe side along the inlet section wall surface 13 under the action of the inlet section wall surface 13, and then respectively enters the annular flow channel at the main shaft side and the inner ring part of the annular flow channel at the collecting pipe side and then flows into the rotor cavity 23;

the two impellers and the rotor cavity shell 16 rotate to generate centrifugal force, so that fluid media in the rotor cavity 23 are driven to be thrown to the outer edge of the rotor cavity 23 from the center of the rotor cavity 23, the speed is increased, certain pressure is achieved, high speed energy is achieved, and due to the rotation of the left impeller and the right impeller, fluid in left flow channels and fluid in right flow channels have high speed energy, so that double suction on the left side and the right side can be achieved, and the maximum flow of the rotary shell pump is improved.

Because the bending tangential direction of the bending part at the tail end of the diameter part of the collecting pipe 17 is opposite to the rotating direction of the two impellers and the rotor cavity shell 16, the fluid which flows in a rotating way at the outer edge of the rotor cavity 23 enters the hollow channel inlet at the end face of the bending part of the collecting pipe 17 and then flows out from the hollow channel outlet at the end face of the shaft part of the collecting pipe 17.

Finally, due to the high-speed rotation of the fluid medium in the rotor cavity 23 and the high-speed rotation of the rotor cavity shell 16, the whole rotor cavity shell 16 has high kinetic energy, the vibration of the whole device is certainly caused, and the two ends of the rotor cavity shell 16 are fixed at the left end and the right end of the pump shell 15, so that the severe vibration of the rotor cavity shell 16 can be effectively prevented, the inherent frequency of the rotary shell pump is improved, and the vibration noise problem of the rotary shell pump is effectively improved.

Therefore, the invention designs the double-suction inlet formed on the wall surface of the inlet section and the structure supported by the two ends of the pump shell, and fully utilizes the structure, thereby improving the maximum flow of the rotary shell pump, improving the inherent frequency of the rotary shell pump, effectively solving the problem of vibration noise of the rotary shell pump, improving the maximum power of the rotary shell pump and prolonging the service life.

Claims

1. The utility model provides a novel both ends are supported, high-efficient double suction spiral shell pump of low vibration which characterized in that: comprises a main shaft (4), a pump shell (9), a left impeller (11), a rotor cavity shell (16), a collecting pipe (17) and a right impeller (22); a main shaft (4) and a collecting pipe (17) are installed in a cavity inside a pump shell (9), the collecting pipe (17) comprises a shaft part and a diameter part, one ends of the shaft part and the diameter part are connected to form an L shape, the shaft part and the main shaft (4) of the collecting pipe (17) respectively extend into the pump shell (9) from two sides of the pump shell (9), the shaft part and the main shaft (4) of the collecting pipe (17) are coaxially and oppositely arranged, and the diameter part of the collecting pipe (17) is perpendicular to the shaft part and extends from the end part of the shaft in the radial direction; a liquid inlet (12) is formed in the top end of the pump outer shell (9), a shunting inner shell is installed in a cavity inside the pump outer shell (9) above the collecting pipe (17) and the main shaft (4), gaps are respectively formed between two ends of the shunting inner shell along the axial direction of the main shaft (4) and the inner wall of the cavity inside the pump outer shell (9), and the two gaps are respectively used as two independent vertical flow channels; meanwhile, the top surface of the shunting inner shell is arranged to be ridge-shaped and serves as an inlet section wall surface (13), and fluid flows into the shunting inner shell respectively along two vertical flow channels at the front end and the rear end of the main shaft (4) in the axial direction under the guiding action of the inlet section wall surface (13) after flowing in from the liquid inlet (12);

a rotor cavity shell (16) is arranged in the inner cavity of the shunting inner shell outside the collecting pipe (17) and the main shaft (4), through holes are formed in two ends of the rotor cavity shell (16) and are respectively and coaxially arranged outside the shaft part of the sleeved collecting pipe (17) and the main shaft (4), and the bottoms of two ends of the rotor cavity shell (16) and the shunting inner shell and the bottom of the inner cavity of the pump outer shell (9) are hermetically and rotatably connected; a left impeller (11) and a right impeller (22) are arranged in the inner cavity of the rotor cavity shell (16), the left impeller (11) is coaxially and fixedly sleeved on the main shaft (4), the right impeller (22) is coaxially and movably arranged on the shaft part of the collecting pipe (17), and the peripheral edges of the left impeller (11) and the right impeller (22) are fixedly connected to the inner peripheral surface of the rotor cavity shell (16), so that the rotor cavity shell (16), the left impeller (11) and the right impeller (22) form a whole and rotate around the shaft part of the main shaft (4) and the collecting pipe (17); gaps are formed between the left impeller (11) and the right impeller (22) and the front and rear inner end faces of the rotor cavity shell (16) along the axial direction of the main shaft (4) respectively and serve as annular flow channels, gaps are formed between the shaft part of the collecting pipe (17) and the main shaft (4) and the through hole walls at two ends of the rotor cavity shell (16) respectively and serve as horizontal flow channels (10 and 20), the inner cavity part of the rotor cavity shell (16) between the left impeller (11) and the right impeller (22) serves as a rotor cavity (23), the outer ring parts of the two annular flow channels corresponding to the left impeller (11) and the right impeller (22) are communicated with the rotor cavity (23) through the gaps between the left impeller (11), the peripheral edge of the right impeller (22) and the inner circumferential surface of the rotor cavity shell (16), and the inner ring parts of the two annular flow channels corresponding to the left impeller (11) and the right impeller (22) respectively pass through the horizontal flow channels (10, the collecting pipe (, 20) Is communicated with the two vertical runners; the fluid flowing into the two vertical flow channels respectively flows into the rotor cavity (23) after sequentially passing through the respective horizontal flow channels (10, 20) and the annular flow channel; the diameter part of the collecting pipe (17) is positioned in the rotor cavity (23), the tail end of the diameter part of the collecting pipe (17) is perpendicularly bent along the tangential direction to form a bent part, and the tangential direction of the bent part of the collecting pipe (17) is opposite to the tangential direction of the hour hand which is formed by the rotor cavity shell (16), the left impeller (11) and the right impeller (22) and rotates around the main shaft (4) and the shaft part of the collecting pipe (17); a hollow passage is formed in the collecting pipe (17), the hollow passage is communicated with the bent part from the shaft part of the collecting pipe (17) through the diameter part, and two ends of the hollow passage respectively penetrate through the shaft part of the collecting pipe (17) and the end face of the bent part; the fluid in the rotor cavity (23) flows in through the hollow channel inlet on the end face of the bent part of the collecting pipe (17) and flows out from the hollow channel outlet on the end face of the shaft part of the collecting pipe (17).

2. The novel double-end-supported, low-vibration and high-efficiency double-suction rotary shell pump as claimed in claim 1, wherein: the middle part of main shaft (4) wear out pump shell (9) back through bearing (7) support suit in bearing box (5), be full of lubricating oil in bearing box (5), the output shaft coaxial coupling through shaft coupling (2) and motor (1) behind bearing box (5) is stretched out to the other end of main shaft (4), motor (1) drives main shaft (4) and rotates under the support of bearing (7) to lubricating oil through in bearing box (5) carries out the self-lubricating.

3. The novel double-end-supported, low-vibration and high-efficiency double-suction rotary shell pump as claimed in claim 2, wherein: the top of the bearing box (5) is provided with an oil filling through hole, an oil plug (6) is installed in the oil filling through hole, and an oil pointer (3) is installed at the bottom of the bearing box (5).

4. The novel double-end-supported, low-vibration and high-efficiency double-suction rotary shell pump as claimed in claim 1, wherein: the left impeller (11) and the main shaft (4) are coaxially connected in a sleeved mode through round-head flat keys.

5. The novel double-end-supported, low-vibration and high-efficiency double-suction rotary shell pump as claimed in claim 1, wherein: the wall surface (13) of the inlet section is used as a flow passage of a fluid medium, and the surface of the inlet section is subjected to smoothing treatment and corrosion prevention treatment.

6. The novel double-end-supported, low-vibration and high-efficiency double-suction rotary shell pump as claimed in claim 1, wherein: the hole end faces of the through holes at the two ends of the rotor cavity shell (16) are respectively and rotationally connected with the bottoms at the two ends of the shunt inner shell and the bottom of the pump outer shell (9) through a packing seal (19).

7. The novel double-end-supported, low-vibration and high-efficiency double-suction rotary shell pump as claimed in claim 1, wherein: a felt ring (8) is connected and arranged between the main shaft (4) and the pump shell (9) for sealing.

8. The novel double-end-supported, low-vibration and high-efficiency double-suction rotary shell pump as claimed in claim 1, wherein: the flow dividing device is characterized by further comprising a pump shell (15), the pump shell (15) is installed in the inner cavity of the flow dividing inner shell, the pump shell (15) is sleeved outside the rotor cavity shell (16) above the collecting pipe (17) and the main shaft (4), the inner surface of the pump shell (15) is connected with the outer surface of the rotor cavity shell (16) in a rotating fit mode, and the two ends of the rotor cavity shell (16) are axially fixed under the action of the pump shell (15) for fixed support.

9. The novel double-end-supported, low-vibration and high-efficiency double-suction rotary shell pump as claimed in claim 1, wherein: the rotor cavity shell (16), the left impeller (11) and the right impeller (22) are integrally cast.

10. The use of a novel double-end-supported, low-vibration, high-efficiency double-suction volute pump as defined in any one of claims 1-9, wherein: the method is applied to fluid conveying in the fields of petrochemical industry, papermaking, food and the like.