Impeller assembly

Abstract

A mounting opening is formed in the middle of an impeller, a connecting convex ring is arranged on the front face of the impeller around the mounting opening, and a connecting shaft sleeve is arranged on the back face of the impeller around the mounting opening; a connecting column is arranged on the inducer in the axial direction of the inducer, a connecting boss is arranged on the connecting column and used for being inserted into the connecting convex ring, the connecting boss is sleeved with a bidirectional lock washer, and a plurality of lock pieces are distributed on the bidirectional lock washer in the circumferential direction at intervals. And first stop grooves are formed in the outer wall of the connecting convex ring in the circumferential direction at intervals, second stop grooves are formed in the outer wall of the inducer in the circumferential direction at intervals, the first stop grooves and the second stop grooves are arranged in a staggered mode, and the adjacent stop pieces are folded and engaged in the first stop grooves and the second stop grooves correspondingly. The impeller and the inducer are installed in a close fit mode through the two-way lock washer, circumferential dislocation of the impeller and the inducer can be prevented, and the overall stability of the impeller assembly is improved.

Description

Technical Field

[0001] The present application relates to the field of impeller assemblies, and in particular to an impeller assembly. Background Art

[0002] At present, ultra-high-speed pumps can achieve high head due to their high speed characteristics, eliminate defects such as long multi-stage pump shafts and low efficiency, meet the requirements of high-performance fluid medium transportation in small sizes, and are widely used in petrochemical, energy, food and other industries. The development of ultra-high-speed pumps has stagnated due to the limitations of low-speed motors and processing technology. The existence of gear transmissions makes the cost of the whole machine too high and requires regular maintenance, which is time-consuming and labor-intensive. Nowadays, permanent magnet synchronous motors are developing rapidly, and processing technology is also improving. It is possible to cancel the gearbox and drive it directly through the motor. In order to meet the requirements of partial vibration and increased load of the pump head under direct motor drive, it is necessary to optimize the components of the pump head. As one of the most critical components of the pump head, the impeller assembly has a great impact on the hydraulic performance and the whole machine.

[0003] The existing impeller assembly includes an inducer and an impeller, which are connected to each other and are both installed in the pump housing. The inducer and the impeller are directly installed on the rotating shaft of the pump, and the inducer and the impeller rotate synchronously with the rotating shaft. The function of the inducer is to increase the flow and pressure of the pump. By increasing the pressure, the pump head can be increased, and cavitation can be avoided at the same time. The function of the impeller is to drive the medium to move, and the medium here can be water, oil and other liquids.

[0004] The Chinese patent application number 2014203642195 discloses an impeller assembly, including an inducer and an impeller. The rear end of the inducer is provided with a protrusion, and the impeller is provided with a mounting hole for the protrusion to be inserted. The connecting seam between the inducer and the impeller is fixed by welding.

[0005] Regarding the above-mentioned related technologies, although the above-mentioned welding fixing method can increase the connection stability between the inducer and the impeller, it reduces the maintenance convenience of the inducer and the impeller, so there is room for certain improvements. Summary of the invention

[0006] In order to improve maintenance convenience, the present application provides an impeller assembly.

[0007] The impeller assembly provided in this application adopts the following technical solution: An impeller assembly comprises an impeller and an inducer, wherein a mounting opening is provided in the middle of the impeller, a connecting convex ring is provided on the front side of the impeller around the mounting opening, and a connecting sleeve is provided on the back side of the impeller around the mounting opening; The inducer is provided with a connecting column along its axial direction, and a connecting boss is provided on the connecting column, and the connecting boss is used to be inserted into the connecting convex ring, and a bidirectional stop washer is connected to the outer surface of the connecting boss, and a plurality of stop plates are distributed at intervals along the circumferential direction on the bidirectional stop washer; The outer wall of the connecting convex ring is provided with first stop grooves at intervals along the circumferential direction, and the outer wall of the inducer wheel is provided with second stop grooves at intervals along the circumferential direction. The first stop grooves and the second stop grooves are arranged alternately, and the adjacent stop plates are folded and engaged in the first stop grooves and the second stop grooves respectively.

[0008] Preferably, the inner wall of the connecting sleeve is provided with a spline groove, and the connecting sleeve is connected to the pump main shaft / motor main shaft through the spline groove.

[0009] Preferably, the connecting column extends into the connecting sleeve, an external thread section is provided on the outer wall of the connecting column, and the connecting column is connected to the pump main shaft / motor main shaft through the external thread section.

[0010] Preferably, a wall sealing groove is provided on the outer wall of the connecting boss, and a wall sealing ring is provided in the wall sealing groove.

[0011] Preferably, an end face sealing groove is formed on the end face of the connecting sleeve, and an end face sealing ring is arranged in the end face sealing groove.

[0012] Preferably, the impeller adopts an open impeller, which includes a cover plate, and a plurality of long blades and a plurality of short blades arranged on the cover plate, the mounting port and the connecting convex ring are arranged in the middle of the cover plate, a plurality of the long blades are distributed around the mounting port in a circumferential direction of the cover plate, a plurality of the short blades are distributed around the mounting port in a circumferential direction of the cover plate, and the short blades are arranged between two adjacent long blades.

[0013] Preferably, the long blades and the short blades are arranged in the same direction, and the long blades and the short blades are arranged in a direction from the inlet to the outlet in sequence of a curved section, a straight section and a reverse curved section.

[0014] Preferably, the radius of curvature of the inlet of the long blade is 15-30 mm, the radius of curvature of the inlet of the short blade is 40-80 mm, and the radius of curvature of the outlet of the long blade is consistent with that of the outlet of the short blade.

[0015] Preferably, the radius of curvature of the long blade in the curved section from the inlet to the outlet increases from 15 mm, the radius of curvature of the long blade in the reverse curved section from the outlet to the inlet increases from 10 mm, and the height of the long blade decreases by 1.5 to 2 mm from the inlet to the outlet; The curvature radius of the short blade in the curved section from the inlet to the outlet increases from 55 mm, the curvature radius of the short blade in the reverse curved section from the outlet to the inlet increases from 10 mm, and the height of the short blade decreases by 1 to 1.5 mm from the inlet to the outlet.

[0016] Preferably, a plurality of balancing holes are evenly distributed on the cover plate along the circumferential direction, and each of the balancing holes is arranged at the inlet position of each of the short blades.

[0017] In summary, the present application includes at least one of the following beneficial technical effects: 1. In the present application, the impeller and the inducer are tightly fitted together and installed through a two-way stop washer, which can prevent the circumferential misalignment between the two and improve the overall stability of the impeller assembly. Considering the application in an ultra-high speed environment, the form of the two-way stop washer can reduce the risk of resonance and can improve the convenience of installation and removal between the impeller and the inducer, further improving the convenience of maintenance; 2. In the present application, the impeller has long blades and short blades, and the long blades and the short blades have corresponding different curvature radii and lengths. The long blades and the short blades are evenly distributed on the cover plate. While ensuring the strength is qualified, the hydraulic performance is more advantageous, and then the axial load of the pump main shaft is reduced, the load fluctuation frequency is low, the stability is better, and the hydraulic efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the installation diagram of the impeller assembly.

[0019] Figure 2 It is a structural schematic diagram of the impeller assembly.

[0020] Figure 3 is an exploded view of the impeller assembly.

[0021] Figure 4 is a cross-sectional view of the impeller assembly.

[0022] Figure 5 It is a schematic diagram of the structure of the impeller.

[0023] Figure 6 This is a schematic diagram of the inducer structure. Explanation of the reference numerals: 1. impeller; 101. mounting opening; 102. connecting convex ring; 103. connecting sleeve; 104. spline groove; 105. end face sealing groove; 106. end face sealing ring; 107. cover plate; 108. long blade; 109. short blade; 110. hollow opening; 111. balancing hole; 112. first retaining groove; 2. inducer; 201. spiral blade; 202. connecting column; 203. connecting boss; 204. wall sealing groove; 205. wall sealing ring; 206. connecting shoulder; 207. second retaining groove; 3. spline section; 4. connecting shaft hole; 5. bidirectional retaining washer; 6. retaining plate. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-6 This application is described in further detail.

[0025] An impeller assembly, referring to Figure 1 and Figure 2 As shown, it is arranged in the pump body of the water pump, and the impeller assembly includes an impeller 1 and an inducer 2. A mounting opening 101 is opened in the middle of the impeller 1, a connecting convex ring 102 is arranged around the mounting opening 101 on the front of the impeller 1, and a connecting sleeve 103 is arranged around the mounting opening 101 on the back of the impeller 1. Figure 1 For reference direction, the lower surface of the impeller 1 is the front side, and the upper surface of the impeller 1 is the back side.

[0026] Reference Figure 3 and Figure 4 As shown, the inner wall of the connecting sleeve 103 is provided with a spline groove 104. In one embodiment, the connecting sleeve 103 is connected to the pump main shaft through the spline groove 104, and the end of the pump main shaft is provided with a spline segment 3 that plugs and matches with the spline groove 104. In another embodiment, the connecting shaft is connected to the motor main shaft through the spline groove 104, and the end of the motor main shaft is provided with a spline segment 3 that plugs and matches with the spline groove 104. Through the connection and matching of the spline groove 104 and the spline segment 3, the impeller 1 can withstand higher torque, increase the matching strength, and avoid loosening.

[0027] An end face sealing groove 105 is formed on the end face of the connecting sleeve 103, and an end face sealing ring 106 is arranged in the end face sealing groove 105. The end face sealing groove 105 is arranged around the spline groove 104. The end face sealing ring 106 can prevent the medium from entering the corrosive pump main shaft or motor shaft.

[0028] The impeller 1 is an open impeller 1, which can reduce the risk of blockage and allow the conveying of chemical or fluid media containing small particles. The impeller 1 includes a cover plate 107, a plurality of long blades 108 and a plurality of short blades 109, a mounting port 101 and a connecting convex ring 102 are arranged in the middle of the cover plate 107, a plurality of long blades 108 and a plurality of short blades 109 are spaced around the mounting port 101 along the circumferential direction of the cover plate 107, and a short blade 109 is arranged between two adjacent long blades 108.

[0029] Reference Figure 3 and Figure 5 As shown, the long blade 108 and the short blade 109 have the same orientation. The orientations of the long blade 108 and the short blade 109 from the inlet to the outlet are a curved section, a straight section, and a reverse curved section in sequence. It is worth noting that the curved section and the reverse curved section are curved in opposite directions. With Figure x as a reference direction, the curvature of the curved section is set downward, and the curvature of the reverse curved section is set upward.

[0030] The radius of curvature of the inlet of the long blade 108 is 15-30 mm. In one embodiment, the radius of curvature of the inlet of the long blade 108 is 15 mm. The radius of curvature of the inlet of the short blade 109 is 40-80 mm. In one embodiment, the radius of curvature of the inlet of the short blade 109 is 55 mm. The radius of curvature of the outlet of the long blade 108 is 10 mm, and the radius of curvature of the outlet of the short blade 109 is 10 mm. The radius of curvature of the outlets of the long blade 108 and the short blade 109 are consistent.

[0031] It is worth noting that the radius of curvature of the long blade 108 from the inlet to the outlet in the curved section increases from 15 mm, and the radius of curvature of the long blade 108 from the outlet to the inlet in the reverse curved section increases from 10 mm. Since the two ends of the straight section are respectively connected to the curved section and the reverse curved section, the radius of curvature of the straight section is infinite. Therefore, the radius of curvature of the long blade 108 from the inlet to the outlet in the curved section gradually increases from 15 mm to infinity, and the radius of curvature of the long blade 108 from the outlet to the inlet in the reverse curved section gradually increases from 10 mm to infinity. This gradually increasing pattern approaches a logarithmic function.

[0032] The height of the long blade 108 decreases by 1.5-2 mm from the inlet to the outlet. In one embodiment, the height of the long blade 108 decreases by 1.88 mm from the inlet to the outlet, that is, the height of the long blade 108 at the inlet is 1.88 mm higher than the height of the long blade 108 at the outlet.

[0033] The radius of curvature of the short blade 109 in the curved section from the inlet to the outlet increases from 55 mm, and the radius of curvature of the short blade 109 in the reverse curved section from the outlet to the inlet increases from 10 mm. Since the two ends of the straight section are respectively connected to the curved section and the reverse curved section, the radius of curvature of the straight section is infinite. Therefore, the radius of curvature of the short blade 109 in the curved section from the inlet to the outlet gradually increases from 55 mm to infinity, and the radius of curvature of the short blade 109 in the reverse curved section from the outlet to the inlet gradually increases from 10 mm to infinity. This gradually increasing pattern approaches a logarithmic function.

[0034] The height of the short blade 109 decreases by 1-1.5 mm from the inlet to the outlet. In one embodiment, the height of the short blade 109 decreases by 1.24 mm from the inlet to the outlet, that is, the height of the short blade 109 at the inlet is 1.24 mm higher than the height of the short blade 109 at the outlet.

[0035] The cover plate 107 is provided with a hollow opening 110 at the outlet between the long blade 108 and the short blade 109. The cover plate 107 is provided with a plurality of balancing holes 111 evenly distributed along the circumferential direction, and each balancing hole 111 is provided at the inlet position of each short blade 109. By providing the balancing holes 111, the axial force is reduced, the axial load is reduced, the load fluctuation frequency is low, and the stability is improved.

[0036] Reference Figure 3 , Figure 4 and Figure 6 As shown, the inducer 2 is provided with a plurality of spiral blades 201 on the outside. In one embodiment, four spiral blades 201 are provided, and the four spiral blades 201 are distributed in a spiral direction. Taking Figure x as a reference perspective, the overall shape of the inducer 2 is conical, and the lower end of the inducer 2 is set as a dome. The inducer 2 is provided with a connecting column 202 along its axial direction. The connecting column 202 is integrally formed at the upper end of the inducer 2. The connecting column 202 extends into the connecting sleeve 103. The outer wall of the connecting column 202 is provided with an external thread section. In one embodiment, the connecting column 202 is connected to the pump main shaft through the external thread section, and the end of the pump main shaft is provided with a connecting shaft hole 4. The inner wall of the connecting shaft hole 4 is provided with an internal thread surface that matches the external thread section. In another embodiment, the connecting column 202 is connected to the motor main shaft through the external thread section. The end of the motor main shaft is provided with a connecting shaft hole 4. The inner wall of the connecting shaft hole 4 is provided with an internal thread surface that matches the external thread section.

[0037] A connecting boss 203 is integrally formed on the connecting column 202 . The connecting boss 203 is cylindrical and is used to be inserted into the connecting convex ring 102 . A wall sealing groove 204 is opened on the outer wall of the connecting boss 203 . A wall sealing ring 205 is arranged in the wall sealing groove 204 .

[0038] A connecting shoulder 206 is formed between the connecting boss 203 and the upper end of the inducer 2. A two-way stop washer 5 is connected to the outer sleeve of the connecting boss 203. The two-way stop washer 5 is located on the connecting shoulder 206. When the connecting boss 203 is inserted into the connecting protruding ring 102, the connecting shoulder 206 is pressed between the end face of the connecting boss 203 and the connecting shoulder 206.

[0039] A plurality of stop plates 6 are spaced apart and distributed along the circumferential direction on the bidirectional stop washer 5 . The stop plates 6 are arranged in a square shape. In one embodiment, the number of the stop plates 6 is 12.

[0040] First stop grooves 112 are arranged at intervals along the circumferential direction on the outer wall of the connecting convex ring 102, and second stop grooves 207 are arranged at intervals along the circumferential direction on the outer wall of the inducer wheel 2. Taking the axial direction of the inducer wheel 2 and the connecting convex ring 102 as a reference angle, the first stop grooves 112 and the second stop grooves 207 are arranged alternately, and adjacent stop plates 6 are folded and engaged in the first stop grooves 112 and the second stop grooves 207 respectively.

[0041] Therefore, when installing the impeller assembly, firstly, the connecting sleeve 103 of the impeller 1 is sleeved on the spline section 3 of the pump main shaft / motor main shaft, the connecting boss 203 of the inducer wheel 2 is inserted into the connecting convex ring 102 of the impeller 1, and the connecting column 202 of the inducer wheel 2 is threadedly connected to the end of the pump main shaft / motor main shaft.

[0042] As the inducer 2 is threadedly connected, the bidirectional stop washer 5 will be pressed between the inducer 2 and the connecting boss 203. Then, the first stop groove 112 on the inducer 2 and the second stop groove 207 on the connecting boss 102 are staggered in the circumferential position, and the stop sheet 6 on the bidirectional stop washer 5 is folded and engaged with the first stop groove 112 and the second stop groove 207, respectively, to complete the fixation between the inducer 2 and the impeller 1 in the circumferential direction.

[0043] The present application uses a two-way stop washer 5 to tightly fit the impeller 1 and the inducer 2, which can prevent circumferential misalignment between the two and improve the overall stability of the impeller assembly. Considering the application in an ultra-high speed environment, the form of the two-way stop washer 5 can reduce the risk of resonance and can improve the installation and removal convenience between the impeller 1 and the inducer 2, further improving the maintenance convenience.

[0044] In addition, the impeller 1 has long blades 108 and short blades 109. The long blades 108 and the short blades 109 have corresponding different curvature radii and lengths. The long blades 108 and the short blades 109 are evenly distributed on the cover plate 107. While ensuring qualified strength, the hydraulic performance is more advantageous, and the axial load of the pump main shaft is reduced, the load fluctuation frequency is low, the stability is better, and the hydraulic efficiency is improved.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An impeller assembly, comprising an impeller (1) and an inducer (2), characterized in that: A mounting opening (101) is provided in the middle of the impeller (1), a connecting convex ring (102) is provided on the front side of the impeller (1) around the mounting opening (101), and a connecting shaft sleeve (103) is provided on the back side of the impeller (1) around the mounting opening (101); The induction wheel (2) is provided with a connecting column (202) along its axial direction, and a connecting boss (203) is provided on the connecting column (202). The connecting boss (203) is used to be inserted into the connecting convex ring (102). A bidirectional stop washer (5) is connected to the outer shell of the connecting boss (203), and a plurality of stop plates (6) are distributed at intervals along the circumferential direction on the bidirectional stop washer (5); First retaining grooves (112) are arranged at intervals along the circumferential direction on the outer wall of the connecting convex ring (102), and second retaining grooves (207) are arranged at intervals along the circumferential direction on the outer wall of the inducer wheel (2). The first retaining grooves (112) and the second retaining grooves (207) are arranged alternately with each other, and adjacent retaining plates (6) are folded and engaged in the first retaining groove (112) and the second retaining groove (207), respectively.

2. An impeller assembly according to claim 1, characterized in that: The inner wall of the connecting sleeve (103) is provided with a spline groove (104), and the connecting sleeve (103) is connected to the pump main shaft / motor main shaft through the spline groove (104).

3. An impeller assembly according to claim 1, characterized in that: The connecting column (202) extends into the connecting sleeve (103), an external thread section is provided on the outer wall of the connecting column (202), and the connecting column (202) is connected to the pump main shaft / motor main shaft through the external thread section.

4. An impeller assembly according to claim 1, characterized in that: A wall sealing groove (204) is provided on the outer wall of the connecting boss (203), and a wall sealing ring (205) is provided in the wall sealing groove (204).

5. An impeller assembly according to claim 1, characterized in that: An end face sealing groove (105) is provided on the end face of the connecting shaft sleeve (103), and an end face sealing ring (106) is arranged in the end face sealing groove (105).

6. An impeller assembly according to claim 1, characterized in that: The impeller (1) is an open impeller (1), comprising a cover plate (107), and a plurality of long blades (108) and a plurality of short blades (109) arranged on the cover plate (107); the mounting opening (101) and the connecting convex ring (102) are arranged in the middle of the cover plate (107); the plurality of long blades (108) are distributed at intervals around the mounting opening (101) in a circumferential direction of the cover plate (107); the plurality of short blades (109) are distributed at intervals around the mounting opening (101) in a circumferential direction of the cover plate (107); and the short blade (109) is arranged between two adjacent long blades (108).

7. An impeller assembly according to claim 6, characterized in that: The long blades (108) and the short blades (109) are arranged in the same direction. The long blades (108) and the short blades (109) are arranged in a direction from the inlet to the outlet in the order of a curved section, a straight section and a reverse curved section.

8. An impeller assembly according to claim 7, characterized in that: The curvature radius of the inlet of the long blade (108) is 15 to 30 mm, the curvature radius of the inlet of the short blade (109) is 40 to 80 mm, and the curvature radii of the outlets of the long blade (108) and the short blade (109) are consistent.

9. An impeller assembly according to claim 8, characterized in that: The curvature radius of the long blade (108) in the curved section from the inlet to the outlet increases from 15 mm, the curvature radius of the long blade (108) in the reverse curved section from the outlet to the inlet increases from 10 mm, and the height of the long blade (108) decreases by 1.5 to 2 mm from the inlet to the outlet; The curvature radius of the short blade (109) in the curved section from the inlet to the outlet increases from 55 mm, the curvature radius of the short blade (109) in the reverse curved section from the outlet to the inlet increases from 10 mm, and the height of the short blade (109) decreases by 1 to 1.5 mm from the inlet to the outlet.

10. An impeller assembly according to claim 6, characterized in that: A plurality of balancing holes (111) are evenly distributed on the cover plate (107) along the circumferential direction, and each of the balancing holes (111) is arranged at the inlet position of each of the short blades (109).

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