A shielded vortex pump

Abstract

The invention relates to the technical field of vortex pumps and discloses a shielded vortex pump, wherein a stator shielding sleeve is fixedly installed in the middle of a pump body, a stator assembly is fixedly installed inside the stator shielding sleeve, a front bearing seat is fixedly installed in a shaft head chamber of the pump body, a rear bearing seat is fixedly installed in the middle of a tail end of the pump body, a front bearing is fixedly installed in the middle of the front bearing seat, a front shaft sleeve is fixedly installed on the inner ring of the front bearing, a rear bearing is fixedly installed in the middle of the rear bearing seat, a rear shaft sleeve is fixedly installed on the inner ring of the rear bearing, a rotor shaft is fixedly sleeved in the middle of the front shaft sleeve and the rear shaft sleeve, a rotor assembly is fixedly installed on the outer ring of the middle of the rotor shaft, a rotor shielding sleeve is provided on the outer ring of the rotor assembly, a vortex impeller is sleeved on the outer ring of the rotor shaft located at the inner end of the shaft head chamber, the shielded vortex pump has small external dimensions, small volume, high head, high stability, and good pressure balancing effect of the vortex impeller.

Description

Technical Field

[0001] The invention relates to the technical field of vortex pumps, in particular to a shielded vortex pump. Background Art

[0002] In the chip manufacturing process, a semiconductor temperature control device Chiller is needed to accurately control the temperature of the reaction chamber. It is mainly composed of a heat exchanger, a circulating pump, a compressor and a control system. The circulating pump used in the semiconductor temperature control device conveys a new coolant FC-3283, which is non-corrosive, non-flammable and non-explosive, has good safety, a large specific gravity, a normal temperature specific gravity of 1.83, a small flow rate, and a high head. There are currently two types of products used: one is a shielded centrifugal pump, and the other is a magnetic vortex pump. Both of these product types have shortcomings when used in chip semiconductor processes:

[0003] Although the shielded centrifugal pump can achieve machine-pump integration, no mechanical seal, and absolutely no leakage, the device has a high delivery head. The use of centrifugal pumps requires a larger impeller outer diameter and a larger pump body radial dimension, resulting in a larger outer dimension of the circulating pump, while the temperature control device Chiller has a compact structure and a small outer dimension, and there is insufficient installation space. Moreover, when the centrifugal pump has a small flow and high head, the hydraulic efficiency is low, and the temperature rise of the pump inlet and outlet increases, which is not conducive to energy saving of the device system, nor is it conducive to temperature control of the device system. In addition, the centrifugal pump curve is usually relatively flat and not steep enough, and the system circulation pipeline is small, which will make the flow of the system susceptible to interference from external factors when it is working, resulting in unstable flow, large fluctuations, and even insufficient flow;

[0004] The magnetic vortex pump is also a sealless pump and can be absolutely leak-free, but it needs to add a magnetic coupling drive device, which increases the axial size and the overall size of the product. In addition, the magnetic vortex pump needs to be equipped with a three-phase asynchronous induction motor as the power, and the motor has a cooling fan, which increases the noise of the product.

[0005] At the same time, the vortex impeller needs to balance the liquid pressure on both sides through the balancing hole when it rotates, but the existing balancing hole is relatively small and the hydraulic pressure changes inside the pump body are also irregular. Therefore, it is easy to cause the hydraulic pressure at the front end of the vortex impeller to enter the back through the balancing hole. The front hydraulic pressure suddenly becomes smaller, and the balancing hole cannot quickly balance the liquid pressure, resulting in the vortex impeller still being in an unbalanced pressure state. Therefore, the balancing effect of the existing balancing hole is poor. Summary of the invention

[0006] In view of the shortcomings of the above-mentioned background technology, the present invention provides a shielded vortex pump, which has the advantages of high head, stability, and fast pressure balance speed, and solves the problems raised by the background technology.

[0007] The present invention provides the following technical solution: a shielded vortex pump, comprising a pump body, a stator shielding sleeve fixedly installed in the middle of the pump body, a stator assembly fixedly installed inside the stator shielding sleeve, a front bearing seat fixedly installed in the shaft head chamber of the pump body, a rear bearing seat fixedly installed in the middle of the tail end of the pump body, a front bearing fixedly installed in the middle of the front bearing seat, a front shaft sleeve fixedly installed on the inner ring of the front bearing, a rear bearing fixedly installed in the middle of the rear bearing seat, a rear shaft sleeve fixedly installed on the inner ring of the rear bearing, a rotor shaft fixedly sleeved between the front shaft sleeve and the middle of the rear shaft sleeve, and a rotor shaft fixedly sleeved in the middle of the outer ring of the rotor shaft A rotor assembly is fixedly installed, and a rotor shielding sleeve is provided on the outer ring of the rotor assembly. The outer ring of the rotor shaft located at the inner end of the shaft head chamber is sleeved with a vortex impeller and a flat key A is installed at the sleeve joint. The outer ring of the rotor shaft close to the rear bearing seat is fixedly sleeved with a clamp, and a front wear-resistant ring and a rear wear-resistant ring are fixedly installed on both sides of the vortex impeller inside the pump body. An O-ring is installed on the pump body at the end face of the front flange of the motor, a fixing screw hole is provided at the front end of the front sleeve and the front sleeve is fixed to the rotor shaft by a fixing screw, and the outer ring of the rotor shaft is fixedly installed with front and rear thrust plates at the end of the rotor assembly.

[0008] Preferably, four balancing holes are provided on the hub of the vortex impeller, a one-way valve is fixedly installed in the balancing hole, an annular groove is provided on the back of the vortex impeller, and a sleeve disc is movably sleeved inside the annular groove, two inner and outer circles of bellows are fixedly installed between the sleeve disc and the inside of the annular groove of the vortex impeller, a hydraulic hole is provided on the back of the pump body between two adjacent balancing holes, and a hydraulic rod is movably sleeved in the hydraulic hole, the hydraulic rod is fixedly connected to the side wall of the sleeve disc, and a hydraulic adjustment hole is provided on the hub of the vortex impeller at the side of the balancing hole, and a hydraulic adjustment block is movably sleeved inside the adjustment hole.

[0009] Preferably, the vortex impeller and the pump body form an annular flow channel, the cross-section of the annular flow channel is rectangular, the sharp corners of the rectangular cross-section are rounded, and the large radius improves the hydraulic efficiency. The flow channel is arranged on the inner end face of the pump body and the end face of the front bearing seat. The pump body inlet and outlet are directly connected to the flow channel at a radial angle of 45 degrees. The top of the pump body flow channel in the vertical direction is provided with a radial partition tongue, and the top of the pump body flow channel and the front bearing seat flow channel in the circumferential direction are both provided with axial partition tongues. The gap between the partition tongue and the vortex impeller is very small, and the radial gap between the outer diameter of the vortex impeller and the pump body partition tongue is 20 to 25 threads on one side.

[0010] Preferably, the end face of the pump body flow channel is provided with a front wear-resistant ring, and the end face of the front bearing seat is provided with a rear wear-resistant ring. The axial clearance of the vortex impeller in the front and rear wear-resistant rings is very small, and the bilateral clearance is about 15 to 20 threads. The end faces of the front and rear wear-resistant rings are flush with the end faces of the axial partition tongues of the pump body and the front bearing seat. The three partition tongues are combined to separate the pump flow channel into a low-pressure zone and a high-pressure zone. The low-pressure zone is connected to the pump inlet, and the high-pressure zone is connected to the pump outlet.

[0011] Preferably, the hydraulic adjustment block sliding seal is sleeved inside the adjustment hole, the one-way conductivity of the one-way valve installed in the vortex impeller balance hole is spaced and opposite, the hydraulic adjustment block controls the limit of the valve core inside the adjacent one-way valve, and the hydraulic hole is filled with expandable and compressible liquid.

[0012] Preferably, the rotor assembly has an axial play, the vortex impeller floats freely on the rotor shaft and the floating limit value is the axial play of the rotor shaft plus the axial clearance of the vortex impeller.

[0013] Preferably, the vortex impeller is made of high molecular polymer polyetheretherketone PEEK plus 30% carbon fiber, the rotor shaft is made of martensitic stainless steel 1CrNi, the shaft head is sprayed with WC hard alloy or hard chrome plated, and the front wear-resistant ring provided on the end face of the pump body flow channel and the rear wear-resistant ring provided on the end face of the front bearing seat are made of 304 stainless steel liquid nitriding.

[0014] The present invention has the following beneficial effects:

[0015] 1. Shielded vortex pump structure, the motor and pump share a shaft, the inner diameter of the stator assembly and the outer diameter of the rotor assembly are respectively provided with a stator shielding sleeve and a rotor shielding sleeve, so that the conveying medium is separated from the electromagnetic material and the motor is protected. The product is a shielded closed structure and is absolutely leak-free. Under the same outer diameter size, the head is 4 to 5 times that of the same size centrifugal pump. It has small dimensions and volume, high head, and the flow head performance curve drops sharply. The flow is relatively stable and will not be adversely affected by the disturbance of the pipeline system. Under the condition of small flow and high head, the pump efficiency is high, and the pump inlet and outlet temperature rise is low, which is conducive to the precise temperature control of the entire semiconductor temperature control device system and improves the chip process yield. There is no motor cooling fan, low noise, and it conforms to the concept of environmental protection.

[0016] 2. The vortex impeller is not fixed on the rotor shaft, but floats freely on the rotor shaft, which helps to reduce the wear on both end surfaces of the impeller. The floating limit value is the axial movement of the rotor plus the axial clearance of the impeller. The vortex impeller is made of high molecular polymer polyetheretherketone PEEK plus 30% carbon fiber, with a Shore hardness of HSD88, a small friction coefficient, and good wear resistance. The impeller hub is lengthened to increase the friction contact area between the impeller and the shaft and extend the service life of the impeller. The rotor shaft is made of martensitic stainless steel 1Cr17Ni2, and the shaft head is sprayed with WC cemented carbide or plated with hard chrome. The surface Vickers hardness HV is above 800. The rotor shaft of this material will not rust. After the shaft head is sprayed or electroplated, it has a higher hardness. The PEEK impeller slides on the shaft, and the inner diameter of the impeller hub and the shaft surface will not produce abnormal wear. The front wear-resistant ring on the end face of the pump body flow channel and the rear wear-resistant ring on the end face of the front bearing seat are made of 304 stainless steel liquid nitriding treatment, and the surface Vickers hardness HV is also above 800. The PEEK impeller rotates at high speed between the two wear-resistant rings, and the impeller end face will not produce abnormal wear.

[0017] 3. Four balancing holes are arranged at the hub of the vortex impeller. At the same time, a sleeve disc and a hydraulic rod are arranged on the back of the vortex impeller. When the hydraulic pressure changes, the hydraulic pressure at the front and rear ends of the vortex impeller can be adjusted to maintain a relatively balanced state. This is used to balance the axial force generated by the unbalanced pressure on the front and rear ends of the impeller, reduce the wear on the impeller end face, and the design of the one-way valve and the hydraulic regulating block can realize rapid pressure balance adjustment on both sides, which is more conducive to the protection of the vortex impeller.

[0018] 4. Under the action of the impeller, the liquid flow is transported to the top outlet of the pump flow channel. Due to the obstruction of the radial baffle and axial baffle at the top of the flow channel, the liquid flow cannot return to the inlet, but flows out from the pump body outlet to achieve the purpose of conveying liquid. A small hole is opened on the high-pressure side of the flow channel of the front bearing seat to lead part of the liquid to the front cavity of the motor, and then from the front cavity of the motor through the gap between the stator shielding sleeve and the rotor shielding sleeve to flow into the rear cavity of the motor, and then from the rear bearing and the rear sleeve thrust plate through the liquid groove to flow into the inner cavity of the rear bearing seat. This part of the liquid then passes through the center hole of the rotor shaft and returns from the rear shaft head chamber to the front shaft head chamber, and finally returns to the low-pressure area of ​​the pump suction port through the liquid groove opened on the front wear-resistant ring and the end face of the pump body flow channel, which plays a role in cooling the motor and lubricating the bearings. A small part of the liquid in the front cavity of the motor flows from the front bearing and the front sleeve thrust plate through the liquid groove to the impeller hub, and then returns to the front shaft head chamber through the impeller balance hole, and returns to the low-pressure area of ​​the pump suction port through the liquid groove opened on the end face of the front wear-resistant ring. This part of liquid plays the role of cooling and lubricating the front bearing sleeve thrust plate, better bearing the radial force generated by the vortex impeller, and improving the service life of the shielded vortex pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a cross-sectional view of the pump body of the present invention;

[0021] Figure 3 for Figure 2 Middle AOA profile;

[0022] Figure 4 It is a schematic diagram of the front bearing seat of the present invention;

[0023] Figure 5 This is a schematic diagram of the vortex impeller structure of the present invention;

[0024] Figure 6 for Figure 5 Middle BB section;

[0025] Figure 7 A half-section diagram of the vortex impeller structure of the present invention;

[0026] Figure 8 This is a schematic diagram of the internal structure of the vortex impeller of the present invention;

[0027] Fig. 9 This is a performance test report of the canned motor pump of the present invention.

[0028] In the figure: 1. pump body; 2. flat key A; 3. front wear-resistant ring; 4. vortex impeller; 5. rear wear-resistant ring; 6. front bearing seat; 7. O-ring; 8. front bearing; 9. fastening groove; 10. front bushing; 11. stator assembly; 12. stator shielding sleeve; 13. rotor assembly; 14. rotor shielding sleeve; 15. rear bearing seat; 16. clamp; 17. rear bushing; 18. rear bearing; 19. pin; 20. flat key B; 21. rotor shaft; 22. front and rear thrust plates; 23. set screw; 24. sleeve; 25. one-way valve; 26. bellows; 27. hydraulic adjustment block; 28. hydraulic rod. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Please see attached Figure 1 -Attached Figure 3A shielded vortex pump comprises a pump body 1, a stator shielding sleeve 12 is fixedly installed in the middle of the pump body 1, a stator assembly 11 is fixedly installed inside the stator shielding sleeve 12, a front bearing seat 6 is fixedly installed in the shaft head chamber of the pump body 1, a rear bearing seat 15 is fixedly installed in the middle of the tail end of the pump body 1, a front bearing 8 is fixedly installed in the middle of the front bearing seat 6, a front shaft sleeve 10 is fixedly installed on the inner ring of the front bearing 8, a rear bearing 18 is fixedly installed in the middle of the rear bearing seat 15, a rear shaft sleeve 17 is fixedly installed on the inner ring of the rear bearing 18, a rotor shaft 21 is fixedly sleeved in the middle of the front shaft sleeve 10 and the rear shaft sleeve 17, and a rotor assembly 13 is fixedly installed on the outer ring of the middle of the rotor shaft 21 The outer ring of the rotor assembly 13 is provided with a rotor shielding sleeve 14, the outer ring of the rotor shaft 21 located at the inner end of the shaft head chamber is sleeved with a vortex impeller 4 and a flat key A2 is installed at the sleeve joint, the outer ring of the rotor shaft 21 near the end of the rear bearing seat 15 is fixedly sleeved with a clamp 16, the front wear-resistant ring 3 and the rear wear-resistant ring 5 are fixedly installed on both sides of the vortex impeller 4 inside the pump body 1, the pump body 1 is installed with an O-ring 7 at the front flange end face of the motor, the front sleeve 10 is provided with a set screw hole at the front end and the front sleeve 10 is fixed to the rotor shaft 21 by a set screw 23, and the outer ring of the rotor shaft 21 is located at the end of the rotor assembly 13 and fixedly installed with front and rear thrust plates 22.

[0031] Please see attached Figure 2 -Attached Figure 4 The vortex impeller 4 and the pump body 1 form an annular flow channel. The cross section of the annular flow channel is rectangular. The sharp corners of the rectangular cross section are rounded. The large rounded corners improve the hydraulic efficiency. The flow channel is arranged on the inner end face of the pump body 1 and the end face of the front bearing seat 6. The inlet and outlet of the pump body 1 are directly connected to the flow channel at a 45-degree angle in the radial direction. A radial tongue is arranged on the top of the flow channel of the pump body 1 in the vertical direction. Axial tongues are arranged on the top of the flow channel of the pump body 1 and the flow channel of the front bearing seat 6 in the circumferential direction. The gap between the tongue and the vortex impeller 4 is very small. The vortex impeller 4 The radial clearance between the outer diameter and the partition tongue of the pump body 1 is 20 to 25 threads on one side. The end face of the flow channel of the pump body 1 is provided with a front wear-resistant ring 3, and the end face of the front bearing seat 6 is provided with a rear wear-resistant ring 5. The axial clearance of the vortex impeller 4 in the front and rear wear-resistant rings is very small, and the bilateral clearance is about 15 to 20 threads. The end faces of the front and rear wear-resistant rings are flush with the axial partition tongue end faces of the pump body 1 and the front bearing seat 6. The three partition tongues are combined to separate the pump flow channel into a low-pressure area and a high-pressure area. The low-pressure area is connected to the pump inlet, and the high-pressure area is connected to the pump outlet.

[0032] Please see attached Figure 5 -Attached Figure 8, 4 balancing holes are provided at the hub of the vortex impeller 4, and a one-way valve 25 is fixedly installed in the balancing hole. An annular groove is provided on the back of the vortex impeller 4, and a sleeve disc 24 is movably sleeved inside the annular groove. Two inner and outer circles of bellows 26 are fixedly installed between the sleeve disc 24 and the inside of the annular groove of the vortex impeller 4. A hydraulic hole is provided on the back of the pump body 1 between two adjacent balancing holes, and a hydraulic rod 28 is movably sleeved in the hydraulic hole. The hydraulic rod 28 is fixedly connected to the side wall of the sleeve disc 24. A hydraulic adjustment hole is provided at the hub of the vortex impeller 4 at the side of the balancing hole, and a hydraulic adjustment block 27 is movably sleeved inside the adjustment hole. The hydraulic adjustment block 27 is slidably and sealingly sleeved inside the adjustment hole. The one-way conductivity of the one-way valve 25 installed in the balancing hole of the vortex impeller 4 is opposite in interval type, and the hydraulic adjustment block 27 controls the limit position of the valve core inside the adjacent one-way valve 25. The expandable and compressible liquid filled in the hydraulic hole can ensure that when the hydraulic pressure at the front end of the vortex impeller 4 is large, it enters the area between the sleeve disc 24 and the bellows 26 through the two balancing holes to balance the pressure on both sides of the vortex impeller 4. At the same time, the sleeve disc 24 will be pressed against the inner wall of the front shaft chamber by the hydraulic pressure to limit the position. At this time, the hydraulic rod 28 is stretched outward and is subjected to the negative pressure of the internal hydraulic pressure. When the hydraulic pressure at the front end of the vortex impeller 4 decreases, the pressure change is sensed by the hydraulic regulating block 27, thereby sliding toward the front end of the vortex impeller 4 in the regulating hole, closing the two one-way valves 25 and opening the two opposite one-way valves 25. At this time, the hydraulic pressure inside the bellows 26 and the sleeve disc 24 flows to the front end of the vortex impeller 4 under the action of the hydraulic pressure difference and the negative pressure reset of the hydraulic regulating block 27, thereby quickly balancing the pressure.

[0033] The shielded pump rotor assembly 13 has an axial movement of about 40 to 60 threads. This axial movement is larger than the impeller axial clearance. Therefore, the vortex impeller 4 is not fixed on the rotor shaft, but is designed to float freely on the rotor shaft. The floating limit value is the axial movement of the rotor shaft 21 plus the axial clearance of the vortex impeller 4.

[0034] The material of the vortex impeller 4 is made of high molecular polymer polyetheretherketone PEEK plus 30% carbon fiber, Shore hardness HSD88, small friction coefficient, good wear resistance, and the hub of the vortex impeller 4 is lengthened to increase the friction contact area between the vortex impeller 4 and the shaft, thereby extending the service life of the impeller.

[0035] The rotor shaft 21 is made of martensitic stainless steel 1Cr17Ni2, and the shaft head is sprayed with WC hard alloy or plated with hard chrome. The surface Vickers hardness HV is above 800. The rotor shaft 21 made of this material will not rust. After the shaft head is sprayed or electroplated, it has a higher hardness. The PEEK impeller slides on the shaft, and the inner diameter of the hub and the shaft surface of the vortex impeller 4 will not produce abnormal wear.

[0036] The front wear-resistant ring 3 provided on the end face of the flow channel of the pump body 1 and the rear wear-resistant ring provided on the end face of the front bearing seat 6 are made of 304 stainless steel liquid nitriding treatment, and the surface Vickers hardness HV is also above 800. The PEEK impeller rotates at high speed between the two wear-resistant rings, and the end face of the vortex impeller 4 will not produce abnormal wear.

[0037] Working principle: the liquid flows in from the suction port of the pump body 1, obtains energy through the high-speed rotating vortex impeller 4, flows in a circular manner in the flow channel, and forms a longitudinal vortex perpendicular to the axial plane. The liquid obtains energy once through the vortex impeller 4 in the flow channel due to the longitudinal vortex. Because there are a large number of blades, 48 ​​in total, it can generate a higher head and form a higher pressure. Under the action of the vortex impeller 4, the liquid is transported to the top outlet of the pump flow channel. A radial baffle and an axial baffle are provided between the top outlet and the inlet of the pump flow channel. The gap between the baffle and the impeller is very small, so the liquid cannot return to the inlet, but flows out from the outlet of the pump body 1 to achieve the purpose of transporting liquid.

[0038] A small hole is opened on the flow channel side of the front bearing seat 6 near the high pressure of the pump body outlet, and a part of the liquid is led to the front cavity of the motor, and then flows from the front cavity of the motor through the gap between the stator shielding sleeve 12 and the rotor shielding sleeve 14 into the rear cavity of the motor, and then flows from the rear bearing 18 and the rear shaft sleeve 17 thrust plate through the liquid groove into the inner cavity of the rear bearing seat. This part of the liquid then passes through the center hole of the rotor shaft 21, returns from the rear shaft head chamber to the front shaft head chamber, and finally returns to the low-pressure area of ​​the pump suction port through the liquid groove opened on the front wear-resistant ring 3 and the end face of the flow channel of the pump body 1. This part of the liquid plays a role in cooling the motor and lubricating the bearings;

[0039] When the hydraulic pressure at the front end of the vortex impeller 4 is large, it enters the area between the sleeve disc 24 and the bellows 26 through the two balancing holes to balance the pressure on both sides of the vortex impeller 4. At the same time, the sleeve disc 24 is subjected to the hydraulic pressure and will press against the inner wall of the front shaft chamber to limit the position. At this time, the hydraulic rod 28 is stretched outward and is subjected to the negative pressure of the internal hydraulic pressure. When the hydraulic pressure at the front end of the vortex impeller 4 decreases, the hydraulic regulating block 27 senses the pressure change and slides toward the front end of the vortex impeller 4 in the regulating hole, closing the two one-way valves 25 and opening the two opposite one-way valves 25. At this time, the hydraulic pressure inside the bellows 26 and the sleeve disc 24 flows out to the front end of the vortex impeller 4 under the action of the hydraulic pressure difference and the negative pressure reset of the hydraulic regulating block 27, thereby quickly balancing the pressure.

[0040] A cylindrical hexagon socket screw is provided on the front shaft head of the rotor. A small hole is opened in the hexagon socket screw. By adjusting the size of the small hole, the internal circulation flow rate is adjusted to make the circulation flow rate just right. The circulation flow rate cannot be too small, resulting in insufficient cooling of the motor and heating of the motor, nor can the circulation flow rate be too large, resulting in waste and reduced pump efficiency.

[0041] There is also a small amount of liquid in the front cavity of the motor, which flows from the front bearing 8 and the front sleeve 10 thrust plate through the liquid groove to the hub of the vortex impeller 4, and then returns to the front shaft head chamber through the balance hole of the vortex impeller 4. After merging with the main circulation flow, it returns to the low-pressure area of ​​the pump suction port through the liquid groove opened on the end face of the front wear-resistant ring 3. This part of the liquid plays a role in cooling and lubricating the thrust plate of the front bearing 8 sleeve. The size of the front bearing 8 sleeve is larger than that of the rear bearing 18 sleeve. The purpose is to better bear the radial force generated by the vortex impeller 4 and improve the service life of the shielded vortex pump.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A canned vortex pump, comprising a pump body (1), characterized in that: A stator shielding sleeve (12) is fixedly mounted in the middle of the pump body (1), a stator assembly (11) is fixedly mounted inside the stator shielding sleeve (12), a front bearing seat (6) is fixedly mounted in the shaft head chamber of the pump body (1), a rear bearing seat (15) is fixedly mounted in the middle of the tail end of the pump body (1), a front bearing (8) is fixedly mounted in the middle of the front bearing seat (6), a front shaft sleeve (10) is fixedly mounted on the inner ring of the front bearing (8), a rear bearing (18) is fixedly mounted in the middle of the rear bearing seat (15), a rear shaft sleeve (17) is fixedly mounted on the inner ring of the rear bearing (18), a rotor shaft (21) is fixedly sleeved in the middle of the front shaft sleeve (10) and the rear shaft sleeve (17), a rotor assembly (13) is fixedly mounted on the outer ring of the rotor shaft (21), and the rotor The outer ring of the assembly (13) is provided with a rotor shielding sleeve (14); the outer ring of the rotor shaft (21) located at the inner end of the shaft head chamber is sleeved with a vortex impeller (4) and a flat key A (2) is installed at the sleeve joint; the outer ring of the rotor shaft (21) near one end of the rear bearing seat (15) is fixedly sleeved with a clamp (16); the pump body (1) is fixedly installed with a front wear-resistant ring (3) and a rear wear-resistant ring (5) at both sides of the vortex impeller (4); the pump body (1) is installed with an O-ring (7) at the front flange end face of the motor; the front shaft sleeve (10) is provided with a set screw hole at the front end and the front shaft sleeve (10) is fixed to the rotor shaft (21) by a set screw (23); the outer ring of the rotor shaft (21) is fixedly installed with front and rear thrust plates (22) at the end of the rotor assembly (13); The hub of the vortex impeller (4) is provided with four balancing holes, in which a one-way valve (25) is fixedly installed, the back of the vortex impeller (4) is provided with an annular groove, in which a sleeve disc (24) is movably sleeved, and two inner and outer circles of bellows (26) are fixedly installed between the sleeve disc (24) and the inside of the annular groove of the vortex impeller (4), the back of the pump body (1) is provided with a hydraulic hole located between two adjacent balancing holes, in which a hydraulic rod (28) is movably sleeved, and the hydraulic rod (28) is fixedly connected to the side wall of the sleeve disc (24), and the hub of the vortex impeller (4) is provided with a hydraulic adjustment hole located at the side of the balancing hole, in which a hydraulic adjustment block (27) is movably sleeved; The hydraulic regulating block (27) is slidably sealed and sleeved inside the regulating hole; the one-way valve (25) installed in the balancing hole of the vortex impeller (4) has one-way conductivity that is spaced and opposite; the hydraulic regulating block (27) controls the position limit of the valve core inside the adjacent one-way valve (25); and the hydraulic hole is filled with expandable and compressible liquid.

2. A canned vortex pump according to claim 1, characterized in that: The vortex impeller (4) and the pump body (1) form an annular flow channel, the cross section of the annular flow channel is rectangular, the sharp corners of the rectangular cross section are rounded, and the large rounded corners improve the hydraulic efficiency. The flow channel is arranged on the inner end face of the pump body (1) and the end face of the front bearing seat (6). The inlet and outlet of the pump body (1) are directly connected to the flow channel at a radial angle of 45 degrees. The top of the flow channel of the pump body (1) is provided with a radial tongue in the vertical direction. The top of the flow channel of the pump body (1) and the flow channel of the front bearing seat (6) are both provided with an axial tongue in the circumferential direction. The gap between the tongue and the vortex impeller (4) is very small. The radial gap between the outer diameter of the vortex impeller (4) and the tongue of the pump body (1) is 20 to 25 threads on one side.

3. A canned vortex pump according to claim 2, characterized in that: The pump body (1) flow channel end face is provided with a front wear-resistant ring (3), and the front bearing seat (6) end face is provided with a rear wear-resistant ring (5). The vortex impeller (4) has a very small axial clearance between the front and rear wear-resistant rings, and the bilateral clearance is 15 to 20 threads. The front and rear wear-resistant ring end faces are flush with the pump body (1) and the front bearing seat (6) axial partition tongue end faces. The three partition tongues are combined to separate the pump flow channel into a low-pressure area and a high-pressure area. The low-pressure area is connected to the pump inlet, and the high-pressure area is connected to the pump outlet.

4. A canned vortex pump according to claim 1, characterized in that: The rotor assembly (13) has an axial movement, and the vortex impeller (4) floats freely on the rotor shaft, and the floating limit value is the axial movement of the rotor shaft (21) plus the axial clearance of the vortex impeller (4).

5. A canned vortex pump according to claim 1, characterized in that: The vortex impeller (4) is made of a high molecular polymer polyetheretherketone (PEEK) plus 30% carbon fiber, the rotor shaft (21) is made of martensitic stainless steel 1Cr17Ni2, the shaft head is sprayed with WC hard alloy or hard chrome plated, and the front wear-resistant ring (3) provided on the end face of the flow channel of the pump body (1) and the rear wear-resistant ring provided on the end face of the front bearing seat (6) are made of 304 stainless steel treated with liquid nitriding.

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