Low-noise shield pump with improved mutual interference shielding cover structure

Abstract

According to the low-noise shielding pump with the improved mutual interference shielding case structure, an outer ring shielding case is fixed to a front cover of a motor shell, the outer ring shielding case is of a single-rotation type multi-layer shielding case structure, and an outer ring rectification assembly is installed on the outer ring shielding case; the inner-ring shielding case is fixed with the end ring, the inner-ring shielding case is of a double-rotation type multi-layer shielding case structure, and an inner-ring rectification assembly is installed on the inner-ring shielding case; wherein the outer ring rectification assembly and the inner ring rectification assembly interfere with each other through a blade structure. As the cooling structure of the shielding case is improved, the cooling effect is obviously improved, the noise is obviously reduced, and the stable, safe and efficient operation performance of the pump is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fluid machinery, in particular to a low-noise canned motor pump with improved mutual interference shield structure. BACKGROUND

[0002] The canned motor pump is sealed in a completely closed shell, and the stator winding and the rotor are separated from the conveying medium through the shield. The cooling effect of the motor is directly related to the operation and noise of the pump. The high-efficiency cooling system is stable, low and harmonious. And the low-efficiency cooling system will cause the temperature of the motor and the pump body to rise, and the local high temperature will intensify the vaporization of the medium, produce bubbles, and the bubbles will reach the high-pressure area with the fluid, and then rapidly collapse, produce a violent shock wave, and hit the pump parts, thereby producing a burst sound. Therefore, optimizing the motor cooling structure to improve the noise generation is an urgent technical problem to be solved at present.

[0003] However, the cooling of the canned motor pump in the prior art has design limitations, which rarely considers the cooling of the inner ring rotor group and the outer ring stator group separately, and does not essentially change the related structure, and has poor adaptability, poor stability, high surge, high noise and low efficiency. The inner ring rotor group needs more cooling liquid to cool relative to the outer ring stator group, and the cooling of the inner ring rotor group is obviously different in essence from the cooling of the outer ring stator group. Therefore, in view of these problems, the present application provides a low-noise canned motor pump with improved mutual interference shield structure to solve the above-mentioned problems to optimize the cooling performance of the inner ring rotor group and the outer ring stator group, and to reduce the noise. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art, and to provide a low-noise canned motor pump with improved mutual interference shield structure.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] The application discloses a low-noise shielding pump with an improved mutual interference shielding cover structure, which comprises a pump and a shielding motor connected with the pump; the pump comprises a water inlet section, a pump body, a front guide wheel, an impeller, a pump rear cover and a pump shaft which are sequentially and connectingly arranged; the shielding motor comprises an inner ring rotor group and an outer ring stator group; the front end of the shielding motor is connected with the pump rear cover through a motor shell front cover; the pump and the shielding motor are drivingly connected through a front bearing seat, a front bearing, a front shaft sleeve and a front thrust disc; the rear end of the shielding motor is drivingly and fixedly connected through a motor shell rear cover, a rear bearing seat, a rear bearing, a rear shaft sleeve and a rear thrust disc; the pump shaft is provided with a circulating flow channel; the outer side of the inner ring rotor group is fixedly provided with an inner ring shielding cover; the inner side of the outer ring stator group is fixedly provided with an outer ring shielding cover; the two ends of the inner ring rotor group are fixedly provided with end rings; the outer ring shielding cover is fixed with the motor shell front cover; the outer ring shielding cover is a single-rotation multi-layer shielding cover structure and is provided with an outer ring rectifying assembly; the inner ring shielding cover is fixed with the end rings; the inner ring shielding cover is a double-rotation multi-layer shielding cover structure and is provided with an inner ring rectifying assembly; and the outer ring rectifying assembly and the inner ring rectifying assembly are interfered with each other through a blade structure.

[0007] Further, the outer ring shielding cover comprises an outer ring first shielding cover, an outer ring second shielding cover and an outer ring third shielding cover which are arranged from outside to inside; first tracks are arranged between the opposite surfaces of the two ends of the outer ring first shielding cover and the outer ring second shielding cover; and a plurality of first balls are arranged in the opposite first tracks.

[0008] Further, a plurality of first track positioning columns are arranged on the circumferential side of the first track; and the first balls are arranged in the space enclosed by the first track positioning columns.

[0009] Further, the opposite surfaces between the outer ring first shielding cover and the outer ring second shielding cover are provided with rectifying surfaces in a wave structure; and the cross-section curve of the rectifying surface is a sine function or a cosine function.

[0010] Further, the outer ring second shielding cover and the outer ring third shielding cover are fixedly connected through guide vanes; and the guide vanes are front-inclined bent and twisted vanes.

[0011] Further, the opposite surfaces between the two ends of the outer ring second shielding cover and the outer ring third shielding cover are provided with flow guiding bodies in a funnel-shaped structure; and the flow guiding bodies accelerate the fluid flow and improve the cooling efficiency.

[0012] Further, the inner ring rectifying assembly comprises an inner ring first shielding cover, an inner ring second shielding cover and an inner ring third shielding cover which are arranged from inside to outside; second tracks are arranged between the opposite surfaces of the two ends of the inner ring first shielding cover and the inner ring second shielding cover and between the opposite surfaces of the two ends of the inner ring second shielding cover and the inner ring third shielding cover; and a plurality of second balls are arranged in the opposite second tracks.

[0013] Further, a plurality of second track positioning columns are arranged on the circumference of the second track, and the second rolling balls are arranged in the space enclosed by the second track positioning columns.

[0014] Further, a rectifier is arranged between the opposite surfaces of the inner ring second shielding cover and the inner ring third shielding cover; the rectifier has a tubular structure, and a plurality of flow channels with a 'ȹ' shaped cross section are evenly arranged on the inner side of the tubular wall in the radial direction.

[0015] Further, the opening of the 'ȹ' shaped flow channel is in communication with the inner side of the tubular wall of the rectifier, and the rectifier comprises a flow distribution plate, a first rectifier and a second rectifier; the first rectifier and the second rectifier are symmetrically arranged on the two sides of the flow distribution plate, and the first rectifier, the second rectifier and the flow distribution plate form an ejector flow channel which gradually shrinks from the inner side of the tubular wall to the outer side of the tubular wall at the opening side.

[0016] Further, the outer ring third shielding cover is provided with outer ring rectifier blades on the side close to the shaft center, and the inner ring third shielding cover is provided with inner ring rectifier blades on the side away from the shaft center; the outer ring rectifier blades and the inner ring rectifier blades are staggered; the inner ring rectifier blades are bent and twisted blades, and the outer ring rectifier blades are straight plate blades; along the fluid flow direction, the radial height of the outer ring rectifier blades and the inner ring rectifier blades both increase first and then decrease.

[0017] Further, the distance between the outer ring first shielding cover and the outer ring second shielding cover is H1, the distance between the outer ring second shielding cover and the outer ring third shielding cover is H2, the distance between the inner ring first shielding cover and the inner ring second shielding cover is H3, and the distance between the inner ring second shielding cover and the inner ring third shielding cover is H4; H3>H1, H3≤H2<H4.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1. In the prior art, the cooling of the shielding cover is a single layer cooling structure, and the cooling effect is poor and the cooling stability is poor; therefore, in order to improve the stability of the motor cooling and reduce the noise, the outer ring shielding cover is fixed to the front cover of the motor shell, the outer ring shielding cover is a single self-rotation type multi-layer shielding cover structure, and the outer ring rectifier assembly is arranged on the outer ring shielding cover; the inner ring shielding cover is fixed to the end ring, and the inner ring shielding cover is a double self-rotation type multi-layer shielding cover structure, and the inner ring rectifier assembly is arranged on the inner ring shielding cover.

[0020] 2、In view of the need for more cooling liquid to cool the inner ring rotor group relative to the outer ring stator group, the applicant sets a first track between the opposite faces of the outer ring first shield and the outer ring second shield, a plurality of first balls are arranged in the opposite first tracks, a second track is arranged between the opposite faces of the inner ring first shield and the inner ring second shield and between the opposite faces of the inner ring second shield and the inner ring third shield, and a plurality of second balls are arranged in the opposite second tracks; The setting of the above structure makes the circulating cooling of the high-speed rotation of the inner ring rotor group in the circulating process of the cooling medium (unstable fluid pressure, self-rotation of the shield and the roller, and finally balance), and also promotes the cooling of the outer ring stator group, the difference is that the inner ring is double-driven and the outer ring is single-driven.

[0021] 3、For the outer ring stator group, the temperature is relatively low on the inner side, the applicant adopts a rectifier surface ring surface with a wave structure, which slowly absorbs the heat generated by the outer ring and quickly conducts into the rapid cooling structure composed of guide vanes and flow guide bodies, better improving the cooling efficiency.

[0022] 4、For the inner ring stator group, the temperature is relatively high on the inner side, the applicant adopts a straight cylinder type to quickly transfer cooling heat (the space between the inner ring first shield 181 and the inner ring second shield 182 is a straight cylinder structure without any accessories), which has a quick cooling effect on the inner ring stator group. In addition, the applicant cooperates with the rectifier and optimizes its structure, such as including a flow dividing plate, an ejector flow channel and other structures to increase the flow area and improve the heat conduction effect.

[0023] 5、The side of the outer ring third shield close to the shaft is provided with an outer ring rectifier vane, and the side of the inner ring third shield away from the shaft is provided with an inner ring rectifier vane, the outer ring rectifier vanes and the inner ring rectifier vanes are staggered, wherein the inner ring rectifier vanes are bent and twisted vanes, and the outer ring rectifier vanes are straight plate vanes; Along the fluid flow direction, the radial height of the outer ring rectifier vanes and the inner ring rectifier vanes both show a trend of first increasing and then decreasing, and the outer ring rectifier assembly and the inner ring rectifier assembly interfere with each other through the vane structure, which greatly promotes the realization of heat transfer / conduction between the inner ring and the outer ring and speeds up the heat dissipation process.

[0024] 6、The first track positioning column and the second track positioning column are arranged to make the roller quickly reach a self-rotation and balance state, greatly optimizing the formation of the cooling circuit. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is an axial sectional structure schematic diagram of the existing shield pump;

[0026] Figure 2 It is Figure 1 An improved structure schematic enlarged view of the outer ring shield 19 and the inner ring shield 18;

[0027] Figure 3 Position structure schematic enlarged view of the first track positioning column 233;

[0028] Figure 4 Structure schematic enlarged view of the rectifier 243.

[0029] In the figure: water inlet section 1, pump body 2, front guide wheel 3, impeller 4, pump rear cover 5, pump shaft 6, motor shell front cover 7, motor shell rear cover 8, front bearing seat 9, rear bearing seat 10, front bearing 11, rear bearing 12, circulating flow passage 13, front shaft sleeve 14, rear shaft sleeve 15, front thrust disc 16, rear thrust disc 17, inner ring shield 18, inner ring first shield 181, inner ring second shield 182, inner ring third shield 183, outer ring shield 19, outer ring first shield 191, outer ring second shield 192, outer ring third shield 193, inner ring rotor group 20, outer ring stator group 21, end ring 22, outer ring rectifier assembly 23, first track 231, first ball 232, first track positioning column 233, rectifier surface 234, guide vane 235, flow guide 236, outer ring guide vane 237, inner ring rectifier assembly 24, second track 241, second ball 242, rectifier 243, flow divider 2431, first rectifier 2432, second rectifier 2433, ejector flow passage 2434, inner ring guide vane 244, distance H1 between outer ring first shield 191 and outer ring second shield 192, distance H2 between outer ring second shield 192 and outer ring third shield 193, distance H3 between inner ring first shield 181 and inner ring second shield 182, distance H4 between inner ring second shield 182 and inner ring third shield 183. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] The present application will be further described in detail below with reference to the drawings.

[0032] As Figures 1-4As shown, a low-noise shielding pump with an improved mutual interference shield structure comprises a pump and a shielding motor connected with the pump; the pump comprises a water inlet section 1, a pump body 2, a front guide wheel 3, an impeller 4, a pump rear cover 5, and a pump shaft 6 connected in sequence; the shielding motor comprises an inner ring rotor group 20 and an outer ring stator group 21, the front end of the shielding motor is connected with the pump rear cover 5 through a motor shell front cover 7, the pump and the shielding motor are drivingly connected through a front bearing seat 9, a front bearing 11, a front shaft sleeve 14, and a front thrust disc 16, the rear end of the shielding motor is drivingly and fixedly connected through a motor shell rear cover 8, a rear bearing seat 10, a rear bearing 12, a rear shaft sleeve 15, and a rear thrust disc 17; the pump shaft 6 is provided with a circulating flow channel 13 at the shaft center; the outer side of the inner ring rotor group 20 is fixedly provided with an inner ring shield 18, and the inner side of the outer ring stator group 21 is fixedly provided with an outer ring shield 19; the two ends of the inner ring rotor group 20 are fixedly provided with end rings 22; characterized in that the outer ring shield 19 is fixed with the motor shell front cover 7, the outer ring shield 19 is a single-rotation multi-layer shield structure, and an outer ring rectifying assembly 23 is mounted on the outer ring shield 19; the inner ring shield 18 is fixed with the end rings 22, the inner ring shield 18 is a double-rotation multi-layer shield structure, and an inner ring rectifying assembly 24 is mounted on the inner ring shield 18; wherein the outer ring rectifying assembly 23 and the inner ring rectifying assembly 24 are mutually interfered through a blade structure.

[0033] Further, the outer ring shield 19 comprises an outer ring first shield 191, an outer ring second shield 192, and an outer ring third shield 193 arranged from outside to inside; first rails 231 are arranged between opposite surfaces of the two ends of the outer ring first shield 191 and the outer ring second shield 192, and a plurality of first balls 232 are arranged in the opposite first rails 231.

[0034] Further, a plurality of first rail positioning columns 233 are arranged on the circumferential side of the first rail 231, and the first balls 232 are arranged in the space enclosed by the first rail positioning columns 233.

[0035] Further, a rectifying surface 234 in a wave structure is arranged on the opposite surfaces between the outer ring first shield 191 and the outer ring second shield 192, and the cross-sectional curve of the rectifying surface 234 is a sine function or a cosine function.

[0036] Further, the outer ring second shield 192 and the outer ring third shield 193 are fixedly connected through guide vanes 235, and the guide vanes 235 are front-inclined bent and twisted vanes.

[0037] Further, a flow guiding body 236 in a funnel-shaped structure is arranged between the opposite surfaces of the two ends of the outer ring second shield 192 and the outer ring third shield 193, and the flow guiding body 236 accelerates fluid flow to improve cooling efficiency.

[0038] Further, the inner ring rectification assembly 24 comprises an inner ring first shield 181, an inner ring second shield 182, and an inner ring third shield 183 arranged from inside to outside; second rails 241 are arranged between opposite surfaces of both ends of the inner ring first shield 181 and the inner ring second shield 182 and between opposite surfaces of both ends of the inner ring second shield 182 and the inner ring third shield 183; and a plurality of second balls 242 are arranged in the opposite second rails 241.

[0039] Further, the second rails 241 are circumferentially provided with a plurality of second rail positioning columns, and the second balls 242 are arranged in a space enclosed by the second rail positioning columns.

[0040] Further, the inner ring second shield 182 and the inner ring third shield 183 are provided with rectification bodies 243 between opposite surfaces; the rectification bodies 243 are in a tubular structure, and a plurality of “ȹ”-shaped structure flow channels are uniformly arranged on the inner side of the tube wall in the radial direction.

[0041] Further, the opening of the “ȹ”-shaped structure flow channel is in communication with the inner side of the tube of the rectification body 243, and the rectification body 243 comprises a flow dividing plate 2431, a first rectification body 2432, and a second rectification body 2433; the first rectification body 2432 and the second rectification body 2433 are symmetrically arranged on both sides of the flow dividing plate 2431, and the first rectification body 2432 and the second rectification body 2433 and the flow dividing plate 2431 form an ejection flow channel 2434 tapering from the inner side of the tube to the outer side of the tube at the opening side.

[0042] Further, the outer ring third shield 193 is provided with outer ring rectification vanes 237 on the side close to the shaft center, the inner ring third shield 183 is provided with inner ring rectification vanes 244 on the side away from the shaft center, the outer ring rectification vanes 237 and the inner ring rectification vanes 244 are staggered, wherein the inner ring rectification vanes 244 are bent and twisted vanes, and the outer ring rectification vanes 237 are straight plate vanes; along the fluid flow direction, the radial height of the outer ring rectification vanes 237 and the inner ring rectification vanes 244 both show a trend of first increasing and then decreasing.

[0043] Further, the distance between the outer ring first shield 191 and the outer ring second shield 192 is H1, the distance between the outer ring second shield 192 and the outer ring third shield 193 is H2, the distance between the inner ring first shield 181 and the inner ring second shield 182 is H3, and the distance between the inner ring second shield 182 and the inner ring third shield 183 is H4; wherein H3>H1, H3≤H2<H4.

[0044] The cooling of the shielding cover in the prior art is a single-layer cooling structure, which has poor cooling effect and poor cooling stability. In order to improve the stability of motor cooling and reduce noise, the applicant adopts an outer ring shielding cover fixed with a motor shell front cover, the outer ring shielding cover is a single-rotation multi-layer shielding cover structure, and an outer ring rectifying assembly is mounted on the outer ring shielding cover; an inner ring shielding cover is fixed with an end ring, and the inner ring shielding cover is a double-rotation multi-layer shielding cover structure, and an inner ring rectifying assembly is mounted on the inner ring shielding cover.

[0045] In view that the inner ring rotor group needs more cooling liquid to cool the outer ring stator group, the applicant sets a first track between opposite faces of the outer ring first shielding cover and the outer ring second shielding cover, a plurality of first balls are arranged in the opposite first tracks, a second track is arranged between opposite faces of the inner ring first shielding cover and the inner ring second shielding cover and between opposite faces of the inner ring second shielding cover and the inner ring third shielding cover, and a plurality of second balls are arranged in the opposite second tracks; the above structure pushes the high-speed rotation of the inner ring rotor group in the circulation of the cooling medium (unstable fluid pressure pushes the rotation of the shielding cover and the ball, and finally reaches balance), and also pushes the cooling of the outer ring stator group, and the difference is that the inner ring is double-driven and the outer ring is single-driven.

[0046] For the outer ring stator group, the temperature is relatively low on the inner side, and the applicant adopts a rectifying surface ring surface in a wave structure, which slowly absorbs the heat generated by the outer ring and quickly conducts into the rapid cooling structure composed of the guide vane and the guide fluid, so as to improve the cooling efficiency.

[0047] For the inner ring stator group, the temperature is relatively high on the inner side, and the applicant adopts a straight cylinder type to quickly transfer cooling heat (the inner ring first shielding cover 181 and the inner ring second shielding cover 182 are straight cylinder structures without accessories), which quickly cools the inner ring stator group and has an immediate effect. In addition, the applicant cooperates with a rectifying fluid and optimizes the structure, such as a flow dividing plate, an ejector flow channel and other structures to increase the flow area and improve the heat conduction effect.

[0048] The side surface of the outer ring third shielding cover close to the shaft is provided with an outer ring rectifying vane, the side surface of the inner ring third shielding cover away from the shaft is provided with an inner ring rectifying vane, the outer ring rectifying vanes and the inner ring rectifying vanes are staggered, the inner ring rectifying vanes are bent and twisted vanes, and the outer ring rectifying vanes are straight plate vanes; along the fluid flow direction, the radial height of the outer ring rectifying vanes and the inner ring rectifying vanes increases first and then decreases, the outer ring rectifying assembly and the inner ring rectifying assembly interfere with each other through the vane structure, which greatly promotes the realization of heat transfer / heat conduction of the inner ring and the outer ring and accelerates the heat dissipation process.

[0049] The first track positioning column and the second track positioning column are arranged so that the roller quickly reaches a self-rotation and balance state, greatly optimizing the formation of the cooling circuit.

[0050] The above embodiments are illustrative of the present application, but are not a limitation of the present application. It can be understood that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the protection scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A low noise shielded pump with improved inter-shield structure, comprising a pump and a shielded motor connected with the pump; the pump comprises a water inlet section (1), a pump body (2), a front guide wheel (3), an impeller (4), a pump rear cover (5), and a pump shaft (6) connected in sequence; the shielded motor comprises an inner ring rotor group (20) and an outer ring stator group (21), the front end of the shielded motor is connected with the pump rear cover (5) through a motor shell front cover (7), the pump and the shielded motor are drivingly connected through a front bearing seat (9), a front bearing (11), a front shaft sleeve (14), and a front thrust disc (16), the rear end of the shielded motor is drivingly and fixedly connected through a motor shell rear cover (8), a rear bearing seat (10), a rear bearing (12), a rear shaft sleeve (15), and a rear thrust disc (17); the pump shaft (6) is provided with a circulating flow channel (13) at the center of the shaft; the outer side of the inner ring rotor group (20) is fixedly provided with an inner ring shield (18), and the inner side of the outer ring stator group (21) is fixedly provided with an outer ring shield (19); the two ends of the inner ring rotor group (20) are fixedly provided with end rings (22); characterized in that: The outer ring shield cover (19) is fixed with the motor shell front cover (7), the outer ring shield cover (19) is single-rotation type multilayer shield cover structure, and the outer ring rectifying assembly (23) is installed on the outer ring shield cover (19); the inner ring shield cover (18) is fixed with the end ring (22), the inner ring shield cover (18) is double-rotation type multilayer shield cover structure, and the inner ring rectifying assembly (24) is installed on the inner ring shield cover (18); wherein the outer ring rectifying assembly (23) and the inner ring rectifying assembly (24) are interfered with each other through the blade structure.

2. The low noise shielded pump with improved cross interference shield structure as claimed in claim 1 wherein, The outer ring shield cover (19) includes the outer ring first shield cover (191), the outer ring second shield cover (192) and the outer ring third shield cover (193) arranged from outside to inside; the opposite faces between the outer ring first shield cover (191) and the outer ring second shield cover (192) are provided with the first track (231), and a plurality of first balls (232) are arranged in the opposite first tracks (231).

3. The low noise shielded pump with improved cross interference shield structure as claimed in claim 2 wherein, The first track (231) is provided with a plurality of first track positioning columns (233) on the circumferential side, and the first balls (232) are arranged in the space enclosed by the first track positioning columns (233).

4. The low noise shielded pump with improved cross interference shield structure of claim 3, wherein, The opposite faces between the outer ring first shield cover (191) and the outer ring second shield cover (192) are provided with the rectifying face (234) in the wave structure, and the cross-sectional curve of the rectifying face (234) is a sine function or a cosine function.

5. The low noise shielded pump with improved cross interference shield structure of claim 4, wherein, The outer ring second shield cover (192) and the outer ring third shield cover (193) are fixedly connected through the guide vane (235), and the guide vane (235) is a front-inclined type bent and twisted vane.

6. The low noise shielded pump with improved cross interference shield structure of claim 5, wherein, The opposite faces between the outer ring second shield cover (192) and the outer ring third shield cover (193) are provided with the flow guide body (236) in the funnel-shaped structure, and the flow guide body (236) accelerates fluid flow to improve the cooling efficiency.

7. The low noise shielded pump with improved cross interference shield structure of claim 6 wherein, The inner ring rectifying assembly (24) includes the inner ring first shield cover (181), the inner ring second shield cover (182) and the inner ring third shield cover (183) arranged from inside to outside; the opposite faces between the two ends of the inner ring first shield cover (181) and the inner ring second shield cover (182) and the opposite faces between the two ends of the inner ring second shield cover (182) and the inner ring third shield cover (183) are provided with the second track (241), and a plurality of second balls (242) are arranged in the opposite second tracks (241).

8. The low noise shielded pump with improved cross interference shield structure of claim 7, wherein, The second track (241) is provided with a plurality of second track positioning columns on the circumferential side, and the second balls (242) are arranged in the space enclosed by the second track positioning columns.

9. The low noise shielded pump with improved cross interference shield structure of claim 8, wherein, The opposite faces between the inner ring second shield cover (182) and the inner ring third shield cover (183) are provided with the rectifying body (243); the rectifying body (243) is in the tubular structure, and a plurality of flow channels in the "ȹ” type structure are uniformly arranged on the inner side of the pipe wall in the radial direction.

10. The low noise shielded pump with improved cross interference shield structure of claim 9, wherein, The opening of the "Y" type structure flow passage communicates with the inner side of the pipe of the rectifier (243), which includes a flow distribution plate (2431), a first rectifier (2432) and a second rectifier (2433), the first rectifier (2432) and the second rectifier (2433) are symmetrically arranged on the two sides of the flow distribution plate (2431), and the first rectifier (2432) and the second rectifier (2433) form an ejection flow channel (2434) which is tapered from the inner side of the pipe to the outer side of the pipe on the opening side with the flow distribution plate (2431).

11. The low noise shielded pump with improved cross interference shield structure of claim 10, wherein, The outer third shielding cover (193) is provided with outer rectifier blades (237) on the side close to the shaft center, the inner third shielding cover (183) is provided with inner rectifier blades (244) on the side away from the shaft center, the outer rectifier blades (237) and the inner rectifier blades (244) are staggered, the inner rectifier blades (244) are bent and twisted blades, and the outer rectifier blades (237) are straight plate blades; along the fluid flow direction, the radial height of the outer rectifier blades (237) and the inner rectifier blades (244) both increase first and then decrease.

12. The low noise shielded pump with improved cross interference shield structure of claim 11, wherein, The distance between the outer first shielding cover (191) and the outer second shielding cover (192) is H1, the distance between the outer second shielding cover (192) and the outer third shielding cover (193) is H2, the distance between the inner first shielding cover (181) and the inner second shielding cover (182) is H3, and the distance between the inner second shielding cover (182) and the inner third shielding cover (183) is H4; wherein H3>H1, H3≤H2<H4.

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