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

Abstract

The invention discloses a novel double-suction rotary shell pump with double-suction support, low-vibration and high-efficiency. The main shaft, the collecting pipe and the split inner casing are installed in the pump casing. The split inner casing has a rotor cavity casing which is set outside the collecting pipe and the main shaft. The left and right impellers, the rotor casing and the left and right impellers are fixed in the inner cavity of the rotor casing It forms a whole and rotates around the main shaft and the collecting tube; an annular flow channel is formed between the impeller and the rotor cavity shell, a horizontal flow channel is formed between the collecting tube and the main shaft and the rotor cavity shell, and a rotor cavity is formed between the left and right impellers, and the fluid passes through the top of the pump shell. After flowing into the liquid inlet, it will flow into the two vertical flow channels between the split inner shell and the pump shell; and then flow into the rotor cavity through the respective horizontal flow channels and annular flow channels in sequence; The reverse bending part enters the hollow channel through the bending part and then flows out. The invention improves the maximum flow rate of the pump, increases the natural frequency of the pump, effectively solves the problem of vibration and noise of the pump, increases the maximum power of the pump, and prolongs the service life.

Description

A new type of double-suction rotary shell pump with support at both ends, low vibration and high efficiency

technical field

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

Background technique

Rotary shell pump is a single-stage, cantilever type pump with small flow and high lift. Currently, it is mainly used in petrochemical, papermaking, food and other fields to transport clean liquids or liquids containing solid particles. Since then, the rotary shell pump has gained wider popularity due to its simple structure, small size, stable operation, low speed, good cavitation resistance, good sealing performance, and its good reputation and strong follow-up development in these fields. application. The rotary shell pump has now become the infusion pump of the drilling flushing system in the automobile manufacturing industry, the feed pump of the carbon black production line, and has become the preferred equipment in the field of deep well waste treatment in chemical plants, food processing, manufacturing workshops, and high-pressure cleaning systems in the paper industry. Standard equipment.

In these practical engineering applications, this single-suction, cantilever rotary shell pump already has very good performance, but we also found its shortcomings in the process of actual use. This single-suction, cantilever structure characteristics, which limit the maximum flow and stability in operation during its use. Under such a technical background and in combination with the problems encountered in actual production, some technical improvements and optimizations have been made in view of the shortcomings of this single-suction, small-flow and cantilevered casing rotary-shell pump. A new type of double-suction rotary shell pump supported at both ends, low-vibration and high-efficiency.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the existing rotary shell pumps in the background art, the purpose of the present invention is to provide a novel double-suction rotary shell pump with support at both ends, low vibration and high efficiency, which can be used for fluid transportation in petrochemical, papermaking, food and other fields. Compared with the traditional rotary shell pump, the device of the invention improves the maximum conveying flow of the rotary shell pump, increases the natural frequency of the rotary shell pump, effectively improves the vibration and noise problem of the rotary shell pump, and also improves the maximum capacity of the rotary shell pump. power, extending the service life of the rotary shell pump.

The technical scheme adopted in the present invention is:

The invention includes a main shaft, a pump casing, a left impeller, a rotor cavity casing, a collecting pipe and a right impeller; the main shaft and the collecting pipe are installed in the inner cavity of the pump casing, and the collecting pipe includes a shaft part and a diameter part, and the shaft part and the diameter One end of the header is connected to form an L shape, the shaft portion and the main shaft of the header respectively protrude into the pump casing from both sides of the pump casing, and the shaft portion of the header and the main shaft are coaxially opposite to each other, and the diameter portion of the header It is arranged perpendicular to the shaft portion and extending in the radial direction from the end portion of the shaft portion.

The top of the pump casing is provided with a liquid inlet, and a split inner casing is installed in the inner cavity of the pump casing above the header and the main shaft. The two gaps are respectively used as two independent vertical flow channels; at the same time, the top surface of the split inner shell is set as a ridge-shaped surface as the wall surface of the inlet section. After the fluid flows in from the liquid inlet, under the guidance of the wall surface of the inlet section, They flow into the two vertical flow channels at the front and rear ends of the split inner casing along the axis of the main shaft.

A rotor cavity shell is installed in the inner cavity of the shunt inner shell outside the header and the main shaft. The two ends of the rotor cavity shell are provided with through holes and are respectively coaxial with the shaft part of the sleeve and the outer main shaft. The rotor cavity shell and the shunt The bottoms of the two ends of the inner shell and the bottom of the inner cavity of the pump shell are connected in a sealed rotation; the inner cavity of the rotor cavity shell is provided with a left impeller and a right impeller, the left impeller is coaxially fixed on the main shaft, and the right impeller is coaxially movably mounted on the main shaft. The shaft portion of the header, 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 header shaft portion.

There are gaps between the left impeller and the right impeller respectively to the front and rear inner end faces of the rotor cavity shell along the axial direction of the main shaft and serve as annular flow channels, and there are gaps between the shaft part of the collector tube and the main shaft and the through-hole hole walls at both ends of the rotor cavity shell respectively. The gap is used as a horizontal flow channel, the inner cavity part of the rotor cavity shell between the left impeller and the right impeller is used as the rotor cavity, and the outer ring parts of the two annular flow channels corresponding to the left and right impeller pass through the left and right The gap between the inner peripheral surfaces of the rotor cavity shell is communicated with the rotor cavity, and the inner ring parts of the two annular flow passages corresponding to the left impeller and the right impeller pass through the horizontal flow passages corresponding to the main shaft and the header shaft and two vertical flow passages respectively. The flow channels are connected; the fluids flowing into the two vertical flow channels respectively flow into the rotor cavity through the respective horizontal flow channels and annular flow channels in sequence.

The diameter part of the collector tube is located in the rotor cavity, and the end of the diameter part of the collector tube is vertically bent along the tangential direction to form a bent part. The clockwise tangential direction of the whole formed by the impeller and the rotation around the main shaft and the axial part of the collecting pipe is opposite; the interior of the collecting pipe is provided with a hollow channel, and the hollow channel is connected from the axial part of the collecting pipe to the bending part through the diameter part, and Both ends of the hollow channel penetrate through the end face of the shaft portion of the header and the end face of the bent portion respectively; the fluid in the rotor cavity flows into the hollow channel inlet of the end face of the bent portion of the header, and flows from the hollow channel on the end face of the shaft portion of the header. outflow.

The middle part of the main shaft goes out of the pump casing and then is set in the bearing box through the bearing support. The bearing box is filled with lubricating oil. The main shaft is driven to rotate under the support of the bearing, and self-lubrication is carried out through the lubricating oil in the bearing box.

The top of the bearing box is provided with an oil injection through hole, an oil plug is installed in the oil injection through hole, and an oil mark is installed at the bottom of the bearing box.

The left impeller and the main shaft are connected by a coaxial sleeve with a round head flat key.

The wall surface of the inlet section is used as the flow channel of the fluid medium, and the surface is smoothed and anti-corrosion treated.

The hole end faces of the through holes at both ends of the rotor cavity shell are respectively connected with the bottoms of the two ends of the split inner shell and the bottom of the pump shell through packing in a sealing manner.

A felt ring is installed between the main shaft and the pump casing for sealing.

It also includes a pump casing, a pump casing is installed in the inner cavity of the split inner casing, the pump casing is sleeved outside the rotor casing above the header and the main shaft, the inner surface of the pump casing and the outer surface of the rotor casing are connected in a rotating fit, and the rotor Both ends of the cavity shell are axially fixed under the action of the fixed support pump shell.

The rotor cavity shell, the left impeller and the right impeller are integrally cast. The main shaft and the left impeller are connected by keys, and the left and right impellers and the entire rotor cavity shell are integrated, which makes the installation and disassembly of the two easier and more convenient. In the traditional rotary shell pump, the rotor cavity shell and the main shaft are connected together by screws, and the impeller and shell are also integrated, which solves the problem of inconvenient disassembly and installation.

The double-suction rotary shell pump of the invention can be applied in the field of petrochemical industry, papermaking, food and other fields of fluid transportation.

The wall surface of the inlet section and the left and right flow channels of the present invention mean that when the fluid medium flows vertically downward at 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 refers to the main shaft and the rotor cavity shell, and the right channel refers to the header and the rotor cavity shell.

Fixing at both ends means that the rotor cavity casing is fixed on the left and right sides of the pump casing. Unlike the traditional cantilever casing, which is only fixed on one side, fixing at both ends can better eliminate the impact of axial force on machine vibration. Makes the overall movement more stable.

The fluid medium flows in through the liquid inlet, and the liquid inlet is arranged in the vertical direction of the rotor cavity. Under the action of the wall of the inlet section, the fluid flows and separates from left to right, and enters the high-speed synchronously rotating rotor cavity from the left and right sides under the action of the centrifugal force of the left and right impellers, making the rotor cavity The liquid around the inner wall has a high pressure, and the high-speed liquid flows into the static collection tube. The flow tube is equivalent to the pressure water chamber of the ordinary centrifugal pump, which has the effect of diffusing, and converts the speed energy into pressure energy, and finally passes through the collection tube. Output high pressure liquid.

Compared with the prior art, the beneficial effects of the present invention are:

Compared with the traditional rotary shell pump, the invention adopts double suction ports. Compared with the traditional rotary shell pump, it is sensitive to cavitation when transporting the medium, so the inlet flow rate is not easy to be too large, thus limiting the maximum flow rate that can be transported by the rotary shell pump. The single suction port is changed to double suction, the inlet speed cooling is half of that of single suction, which can greatly improve the anti-cavitation performance of the rotary shell pump; at the same time, under the same NPSH requirements, it can also increase the maximum delivery flow of the rotary shell pump. , the maximum flow rate that the device can deliver is twice that of the traditional rotary shell pump, and the maximum flow rate can reach 400-500m ³ /h; the double suction ports can also make the axial force of the rotary shell pump self-balance.

Compared with the cantilever type of the traditional rotary shell pump, the device has the advantages of being supported at both ends: it cancels the influence of the large deflection caused by the cantilever on the vibration of the rotor system, improves the natural frequency of the rotary shell pump, and effectively improves the rotary shell pump. The vibration and noise of the pump. The use of the two-end support method can make a breakthrough in the maximum speed of the rotary shell pump. The maximum speed of the traditional rotary shell pump is about 5000-6500 rpm. However, the use of the structure of the present invention can increase the rotary shell pump speed to 10,000-20,000 rpm. RPM, or even higher, with the increase of rotation speed, the fluid medium can obtain a higher lift, the highest lift can reach about 5000m, or even higher.

Description of drawings

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

Figure 2 is a three-dimensional view of the header

Figure 3 is a structural view of the end face of the impeller and the rotor cavity shell.

Figure 4 is a cross-sectional view of the impeller and rotor housing.

In the picture: 1. Motor, 2. Coupling, 3. Oil mark, 4. Main shaft, 5. Bearing box, 6. Oil plug, 7. Bearing, 8. Felt ring, 9. Pump housing, 10. Left horizontal Flow channel, 11, Left impeller, 12, Liquid inlet, 13, Wall surface of inlet section, 14, Inner cavity, 15, Pump housing, 16, Rotor cavity shell, 17, Collector, 18, Water lubricated bearing, 19 , Packing seal, 20, Right horizontal flow channel, 21, Liquid outlet, 22, Right impeller, 23, Rotor cavity.

Detailed ways

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

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

As shown in FIG. 2 , the header 17 includes a shaft portion and a diameter portion, and one end of the shaft portion and the diameter portion are connected to form an L shape. The shaft portion of the header 17 and the main shaft 4 respectively extend into the pump casing 9 from both sides to Inside the pump casing 9, and the shaft portion of the header 17 and the main shaft 4 are coaxially arranged opposite to each other but not connected, the diameter portion of the header 17 is perpendicular to the shaft portion, and starts from the end of the shaft portion in the pump casing 9. The radial direction is extended.

The top of the pump casing 9 is provided with a liquid inlet 12, and a split inner casing is installed in the inner cavity of the pump casing 9 above the header 17 and the main shaft 4, and the split inner casing divides the internal cavity of the pump casing 9 into front and rear along the axial direction of the main shaft 4. There are two independent vertical flow channel spaces, there are gaps between the two ends of the split inner casing along the axial direction of the main shaft 4 and the inner wall of the inner cavity of the pump casing 9 respectively, and the two gaps are used as two independent vertical flow channels respectively. At the same time, the top surface of the split inner casing is set as a ridge-shaped surface as the wall surface 13 of the inlet section. The wall surface 13 of the inlet section is used as the flow channel of the fluid medium, and the surface is smoothed and anti-corrosion treatment. After the fluid flows in from the liquid inlet 12, under the guidance of the wall surface 13 of the inlet section, it flows into the split inner casing along the axial direction of the main shaft 4. In the two vertical flow channels at the front and rear.

The rotor cavity shell 16 is installed in the inner cavity of the manifold 17 and the inner cavity of the split inner shell outside the main shaft 4. The rotor cavity shell 16 is a rotating body structure with a U-shaped cross-section. The two ends of the rotor cavity shell 16 are provided with coaxial through holes. Coaxially with the shaft portion of the sleeved header 17 and outside the main shaft 4, specifically, between the left impeller 11 and the main shaft 4, they are coaxially sleeved and connected by a round head flat key, which is convenient for disassembly and installation of the main shaft. The rotor cavity shell 16 and the bottoms of both ends of the split inner shell, the main shaft 4 and the bottom of the inner cavity of the pump shell 9 under the header 17 are sealed and rotationally connected; as shown in Figures 3 and 4, the inner cavity of the rotor cavity shell 16 There is a left impeller 11 and a right impeller 22 in the middle, and the left impeller 11 and the right impeller 22 have a distance in the axial direction. , the left impeller 11 is fixedly sleeved on the main shaft 4 through a key coaxially, and the right impeller 22 is rotatably installed on the shaft portion of the header 17 through the water lubricated bearing 18 in a coaxially movable and rotatable manner. In the 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 The inner peripheral surface of the rotor cavity shell 16 makes the rotor cavity shell 16 , the left impeller 11 and the right impeller 22 form a whole and rotate around the shaft portion of the main shaft 4 and the header 17 .

There are gaps between the left impeller 11 and the right impeller 22 respectively to the front and rear inner end faces of the rotor cavity shell 16 along the axial direction of the main shaft 4 as annular flow channels. There are gaps between the walls of the through holes 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 the rotor cavity 23. As shown in FIG. 3, the left impeller 11, the right impeller 22 The outer ring parts of the two annular flow passages corresponding to the 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 peripheral surface of the rotor cavity shell 16 . The inner ring parts of the two annular flow channels are communicated with the horizontal flow channels 10 and 20 corresponding to the shafts of the main shaft 4 and the header 17 and the two vertical flow channels respectively; the fluids flowing into the two vertical flow channels pass through the respective The horizontal flow channels 10 , 20 and annular flow channels flow into the rotor cavity 23 .

The radial portion of the header 17 is located in the rotor cavity 23, and is located in the center between the left impeller 11 and the right impeller 22, there is a gap between the end of the radial portion of the header 17 and the inner peripheral surface of the inner cavity of the rotor cavity shell 16, There is a gap between the end of the radial portion of the header 17 and the inner peripheral surface of the rotor cavity shell 16. The end of the radial portion of the header 17 is vertically bent along the tangential direction to form a bent portion, and the bent portion of the header 17 is vertically bent The tangential direction is opposite to the clockwise tangential direction of the rotor cavity shell 16, the left impeller 11 and the right impeller 22 and rotates around the main shaft 4 and the shaft portion of the header 17; the header 17 is provided with a hollow channel inside. The hollow passage is communicated from the shaft portion of the header 17 to the bending portion via the diameter portion, and both ends of the hollow passage respectively penetrate the end faces of the shaft portion and the bending portion of the header 17; the fluid in the rotor cavity 23 is collected The inlet of the hollow passage on the end face of the bent portion of the flow pipe 17 flows in and flows out from the outlet of the hollow passage on the end face of the shaft portion of the header 17 . The hollow passage on the end face of the shaft portion of the header 17 serves as the liquid outlet 21 of the double-suction rotary shell pump.

The liquid inlet 12 separates the flow of the fluid medium under the action of the wall surface 13 of the inlet section. The fluid enters the rotor chamber 23 under the action of the fluid, so that the fluid enters the rotor chamber 23 from the left and right sides, and finally flows out from the liquid outlet 21 through the collecting pipe 17 .

As shown in FIG. 1 , the middle of the main shaft 4 passes through the pump casing 9 and is supported by the bearing 7 in the bearing housing 5. The bearing housing 5 is filled with lubricating oil, and the other end of the main shaft 4 extends out of the bearing housing 5 and passes through the coupling. 2 and the output shaft of the motor 1 are coaxially connected. The motor 1 drives the main shaft 4 to rotate under the support of the bearing 7, and is self-lubricated by the lubricating oil in the bearing box 5. The lubricating oil makes the main shaft rotate well. Lubricates and dissipates heat while allowing the bearings to better support and rotate the spindle. The top of the bearing box 5 is provided with an oil injection through hole, an oil plug 6 is installed in the oil injection through hole, and an oil mark 3 is installed at the bottom of the bearing box 5 . Install the existing oil standard 3 and oil plug 6, so that the addition and monitoring of lubricating oil can be more convenient.

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

The main shaft on the left and the header 17 on the right are sealed by packing seals 19 to prevent the leakage of the fluid medium, so that no fluid enters the cavity 14 between the pump housing 15 and the split inner casing; the header 17 and the right The gap between the impellers 22 is full of water flow, and is connected by the water lubricated bearing 18, which can make the right bearing rotate better, and on the other hand, can make the collecting pipe and the rotor cavity better seal. The pressure between the main shaft 4 and the pump casing 9 is not high, and the felt ring 8 seal is selected instead of the mechanical seal selected by the general rotary shell pump, which prevents the leakage of the fluid in operation and makes the seal very reliable. .

As shown in FIG. 1 , in the specific implementation, a pump casing 15 is also included, and the pump casing 15 is installed in the inner cavity of the split inner casing. , the inner surface of the pump housing 15 and the outer surface of the rotor cavity shell 16 are rotatably connected, and the two ends of the rotor cavity shell 16 are axially fixed under the action of the fixed support pump shell 15, so that the left and right ends of the rotor cavity shell 16 can be well The axial fixation can ensure the stability of the rotor cavity shell 16 during the rotation process.

The invention realizes the double suction of the rotary shell pump through the separation of the wall surface of the inlet section and the action of the left and right impellers. Both ends are fixed, realizing the low vibration and high efficiency of the rotary shell pump.

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

First start the motor 1 and connect it with the main shaft 4 through the coupling 2. In the bearing box 5, the oil plug 6 and the oil standard 3 can better detect and control the lubrication. The main shaft is supported by the bearing 7. Better rotation and self-lubrication.

The operation of the motor 1 drives the main shaft 4 to rotate. Since the main shaft 4 enters the pump casing 9 and is connected to the left impeller 11 through a round head flat key, it drives the left impeller 11 and its fixedly connected rotor cavity shell 16 and the right impeller 22 to rotate synchronously.

During the entire rotation process formed by the rotor cavity shell 16 , the left impeller 11 and the right impeller 22 , the fluid medium enters the interior of the pump casing 9 through the liquid inlet 12 , and flows from the inlet section wall 13 along the inlet section wall surface 13 under the action of the inlet section wall surface 13 . The vertical runners on the main shaft side and the vertical runners on the header side respectively enter the left horizontal runner 10 on the main shaft side and the right horizontal runner 20 on the header side, and then enter the annular runners and runners on the main shaft side respectively. The inner ring part of the annular flow channel on the collector side flows into the rotor cavity 23;

The rotation of the two impellers and the rotor cavity shell 16 generates centrifugal force, which drives the fluid medium in the rotor cavity 23 to fling from the center of the rotor cavity 23 to the outer edge of the rotor cavity 23, and the speed increases, with a certain pressure and high Due to the rotation of the left and right impellers, the fluids in the left and right flow channels have high speed energy, so that the double suction on the left and right sides can be realized, and the maximum flow rate of the rotary shell pump can be improved.

Since the tangential direction of the bending part at the end of the radial end of the collecting pipe 17 is opposite to the rotation direction of the two impellers and the rotor cavity shell 16, the rotating fluid flowing at the outer edge of the rotor cavity 23 enters the collecting pipe 17 and bends The inlet of the hollow passage on the end face of the header pipe 17 flows out from the outlet of the hollow passage on the end face of the shaft portion of the header 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 itself, the entire rotor cavity shell 16 has a high kinetic energy, which will definitely cause the vibration of the entire device and make the rotor cavity shell 16 . The two ends are fixed on the left and right ends of the pump housing 15, which can effectively prevent the violent vibration of the rotor cavity shell 16, improve the natural frequency of the rotary shell pump, and effectively improve the vibration and noise problem of the rotary shell pump.

From this implementation, it can be seen that the present invention designs the structure of double suction ports formed on the wall of the inlet section and the support at both ends of the pump casing, and makes full use of such a structure to increase the maximum flow rate of the rotary shell pump and improve the inherent characteristics of the rotary shell pump. frequency, which effectively solves the vibration and noise problem of the rotary shell pump, increases the maximum power of the rotary shell pump, and prolongs the service life.

Claims (10)

1. A novel two-end support, low-vibration and high-efficiency double-suction rotary shell pump, characterized in that: comprising a main shaft (4), a pump casing (9), a left impeller (11), a rotor cavity shell (16), a collecting pipe (17) and the right impeller (22); the main shaft (4) and the collecting pipe (17) are installed in the inner cavity of the pump casing (9), and the collecting pipe (17) includes a shaft portion and a diameter portion, and the shaft portion and the diameter One end of the pump casing (17) is connected to form an L shape, the shaft portion of the collecting pipe (17) and the main shaft (4) respectively protrude into the pump casing (9) from both sides of the pump casing (9), and the The shaft portion and the main shaft (4) are arranged coaxially opposite to each other, the diameter portion of the header (17) is perpendicular to the shaft portion, and extends along the radial direction from the end portion of the shaft portion; the top of the pump housing (9) is provided with a liquid inlet (12), the manifold (17) and the inner cavity of the pump casing (9) above the main shaft (4) are installed with a split inner casing, and the two ends of the split inner casing along the axial direction of the main shaft (4) are respectively connected to the pump casing ( 9) There are gaps between the inner walls of the internal cavity, and the two gaps are respectively used as two independent vertical flow channels; at the same time, the top surface of the split inner shell is set as a ridge-shaped surface as the wall surface of the inlet section (13). After the inflow of the liquid inlet (12), under the guidance of the wall surface (13) of the inlet section, the liquid inlet (12) respectively flows into the two vertical flow channels at the front and rear ends of the split inner casing along the axial direction of the main shaft (4); A rotor cavity shell (16) is installed in the inner cavity of the manifold (17) and the shunt inner shell outside the main shaft (4), and two ends of the rotor cavity shell (16) are provided with through holes and are respectively coaxial with the sleeved manifold. Outside the shaft portion of (17) and the main shaft (4), the rotor cavity shell (16) and the bottoms of both ends of the split inner shell and the bottom of the inner cavity of the pump shell (9) are rotationally connected in a sealed manner; inside the rotor cavity shell (16) The cavity is provided with a left impeller (11) and a right impeller (22), the left impeller (11) is coaxially and fixedly sleeved on the main shaft (4), and the right impeller (22) is coaxially movably installed on the shaft of the header (17). 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 The whole unit rotates around the shaft of the main shaft (4) and the header (17). There is a gap and serves as an annular flow channel, and there are gaps between the shaft portion of the header (17) and the main shaft (4) and the through hole walls at both ends of the rotor cavity shell (16) respectively, and serve as horizontal flow channels (10, 20) , the inner cavity part of the rotor cavity shell (16) between the left impeller (11) and the right impeller (22) is used as the rotor cavity (23), and the two annular flow channels corresponding to the left impeller (11) and the right impeller (22) The outer ring part is communicated with the rotor cavity (23) through the gap between the peripheral edges of the left impeller (11) and the right impeller (22) and the inner peripheral surface of the rotor cavity shell (16). The left impeller (11) and the right impeller (22) The inner ring parts of the corresponding two annular flow channels are respectively communicated with the horizontal flow channels (10, 20) corresponding to the shaft parts of the main shaft (4) and the header (17) and the two vertical flow channels; The fluid in the straight channel flows into the rotor cavity (23) through the respective horizontal flow channels (10, 20) and the annular flow channel in sequence; The end of the diameter part of the tube (17) is vertically bent along the tangential direction to form a bent part, and the tangential direction of the bent part of the collector tube (17) is vertically bent and the tangential direction of the rotor cavity shell (16), the left impeller (11) and the right The clockwise tangential direction of the whole formed by the impeller (22) and the rotation around the main shaft (4) and the shaft of the header (17) is opposite; the inner of the header (17) is provided with a hollow channel, and the hollow channel extends from the header (17). The shaft part of 17) is connected to the bending part through the diameter part, and both ends of the hollow passage respectively penetrate the end faces of the shaft part and the bending part of the collecting pipe (17); the fluid in the rotor cavity (23) passes through the collecting pipe. The inlet of the hollow passage on the end face of the bent portion of the pipe (17) flows in and flows out from the outlet of the hollow passage on the end face of the shaft portion of the header (17). 2. A novel two-end support, low-vibration, high-efficiency double-suction rotary shell pump according to claim 1, characterized in that: the middle part of the main shaft (4) passes through the pump shell (9) and passes through the bearing (7) ) The supporting sleeve is installed in the bearing housing (5), the bearing housing (5) is filled with lubricating oil, and the other end of the main shaft (4) extends out of the bearing housing (5) and then passes through the coupling (2) and the output of the motor (1). The shafts are coaxially connected, and the motor (1) drives the main shaft (4) to rotate under the support of the bearing (7), and self-lubricates through the lubricating oil in the bearing housing (5). 3. A new type of double-suction rotary casing pump with low vibration and high efficiency according to claim 2, characterized in that: the top of the bearing housing (5) is provided with an oil injection through hole, and the oil injection through hole is installed in the oil injection through hole. There is an oil plug (6), and an oil gauge (3) is installed at the bottom of the bearing housing (5). 4. A new type of double-suction rotary shell pump with low vibration and high efficiency according to claim 1, characterized in that: the left impeller (11) and the main shaft (4) are connected by a round head flat key. Axle set connection. 5. A new type of two-end support, low-vibration and high-efficiency double-suction rotary shell pump according to claim 1, characterized in that: the wall surface (13) of the inlet section is used as the flow channel of the fluid medium, and the surface is smoothed and Do anti-corrosion treatment. 6. A novel two-end support, low-vibration, high-efficiency double-suction rotary shell pump according to claim 1, characterized in that: the hole end faces of the through holes at both ends of the rotor cavity shell (16) are respectively and the split inner shell The bottoms of the two ends of the pump casing (9) are rotatably connected through a packing seal (19). 7. A novel two-end support, low-vibration and high-efficiency double-suction rotary shell pump according to claim 1, characterized in that: a felt ring is installed between the main shaft (4) and the pump casing (9) (8) to seal. 8. A novel two-end support, low-vibration, high-efficiency double-suction rotary shell pump according to claim 1, characterized in that: it also comprises a pump casing (15), and the pump casing (15) is installed in the inner cavity of the split inner casing. 15), the pump housing (15) is sheathed outside the header (17) and the rotor cavity shell (16) above the main shaft (4), the inner surface of the pump housing (15) and the outer surface of the rotor cavity shell (16) rotate The two ends of the rotor cavity casing (16) are axially fixed under the action of the pump casing (15) for fixing and supporting by the cooperative connection. 9. A new type of double-suction rotary casing pump with low vibration and high efficiency according to claim 1, characterized in that: the rotor cavity shell (16), the left impeller (11), the right impeller (22) It is cast in one piece. 10. The application of a novel two-end support, low-vibration and high-efficiency double-suction rotary shell pump according to any one of claims 1-9, characterized in that: it is applied in the field of petrochemical industry, papermaking, food and other fields of fluid transportation.

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