Multistage shield pump

Abstract

The utility model relates to a multistage shield pump which comprises a pump body with a pump cavity, a shield motor with a rotor cavity and a driving assembly, the shield motor is fixedly connected to the pump body, the pump cavity communicates with the rotor cavity, a water inlet channel and a water outlet channel which communicate with the outside are formed in the pump cavity, a rotor shaft is rotationally connected into the rotor cavity, and the rotor shaft is connected with the rotor cavity. One end of the rotor shaft extends into the pump cavity, a plurality of impellers are arranged at the end, located in the pump cavity, of the rotor shaft, a first filter screen is arranged at the end, close to the pump cavity, of the rotor cavity, a scraping rod is slidably connected to the first filter screen, and the driving assembly is used for driving the scraping rod to slide. The first filter screen can filter water entering the rotor cavity, the possibility that particle impurities enter the rotor cavity is reduced, the driving assembly drives the scraping rod to slide, the surface of the first filter screen is scraped, and the possibility that the particle impurities are accumulated and blocked on the surface of the first filter screen is reduced; therefore, the possibility that water flow cannot enter the rotor cavity to cool the rotor cavity is reduced.

Description

Technical Field

[0001] The utility model relates to the field of canned motor pumps, in particular to a multistage canned motor pump. Background Art

[0002] The canned motor pump belongs to a special form of centrifugal pump, mainly composed of a pump body, an impeller, a stator, a rotor, front and rear guide bearings, and a thrust disc. The motor and the pump are integrated into one. The surfaces of the stator and the rotor are respectively encapsulated with non-magnetic thin-walled materials. The rotor is supported by the front and rear guide bearings and immersed in the conveyed medium. An impeller is installed at the end of the rotor shaft to form a shaft-seal-free structure for the purpose of leak-free transportation.

[0003] The utility model patent with the publication number of CN221170016U discloses a multistage canned motor pump. The multistage canned motor pump includes an inlet housing, an outlet housing, a multistage impeller, a plurality of guide vanes, and a motor assembly; the inlet housing and the outlet housing are arranged at intervals, the multistage impeller and the plurality of guide vanes are both installed between the inlet housing and the outlet housing; the motor assembly is installed on the outlet housing, the rotor shaft of the motor assembly penetrates through the outlet housing and extends into the pressurization cavity defined by the inlet housing and the outlet housing, and the multistage impeller is all installed on the rotor shaft.

[0004] In the above-mentioned multistage canned motor pump, the liquid entering the rotor part cannot be filtered. After the unfiltered liquid enters the rotor part, particulate impurities are likely to cause wear on the outside of the rotor, affecting the service life of the pump body and causing the pump body to fail to work properly. Content of the Utility Model

[0005] In order to reduce the possibility of particulate impurities entering the rotor part of the canned motor pump, the present application provides a multistage canned motor pump.

[0006] The multistage canned motor pump provided by the present application adopts the following technical solutions:

[0007] A multistage canned motor pump includes a pump body with a pump cavity, a canned motor with a rotor cavity, and a driving assembly. The canned motor is fixedly connected to the pump body. The pump cavity and the rotor cavity are communicated with each other. An inlet channel and an outlet channel communicating with the outside are opened on the pump cavity. A rotor shaft is rotatably connected in the rotor cavity. One end of the rotor shaft extends into the pump cavity. A plurality of impellers are arranged on the end of the rotor shaft located in the pump cavity. A first filter screen is arranged along one end of the rotor cavity close to the pump cavity. A scraping rod is slidably connected to the first filter screen. The driving assembly is used to drive the sliding of the scraping rod.

[0008] By adopting the above technical solution, the first filter screen can filter the water entering the rotor cavity, reducing the possibility of particulate impurities entering the rotor cavity. By driving the scraping rod to slide through the driving component, the surface of the first filter screen is scraped, reducing the possibility of particulate impurities accumulating and blocking on the surface of the first filter screen, thereby reducing the possibility that water cannot enter the rotor cavity to cool the rotor cavity.

[0009] Preferably, the first filter screen includes a mounting ring and a plurality of arc-shaped rods. The plurality of arc-shaped rods are respectively fixedly connected to the mounting ring, and the plurality of arc-shaped rods are uniformly distributed in a direction perpendicular to the axis of the rotor. The scraping rod is slidably connected to the plurality of arc-shaped rods along the radian direction of the arc-shaped rods.

[0010] By adopting the above technical solution, the plurality of arc-shaped rods can filter the water entering the rotor cavity and guide the sliding of the scraping rod; after filtration, the particulate impurities remain on the plurality of arc-shaped rods, and when the scraping rod scrapes the arc-shaped rods, the particulate impurities on the arc-shaped rods are discharged toward the water outlet channel side, reducing the possibility of particulate impurities accumulating on the arc-shaped rods.

[0011] Preferably, the driving component includes a cam. The cam is fixedly connected to the rotor shaft, and the scraping rod is fixedly connected to the cam.

[0012] By adopting the above technical solution, when the rotor shaft rotates, the cam is driven to rotate together, and the scraping rod on the cam rotates together; when the cam rotates to the arc-shaped rod, the cam drives the scraping rod to scrape the particulate impurities on the arc-shaped rod.

[0013] Preferably, the axial cross-section of the mounting ring is arranged in a spiral shape.

[0014] By adopting the above technical solution, the water entering the rotor cavity is filtered, reducing the possibility of flaky impurity particles entering the rotor cavity through the arc-shaped rods, and blocking some flaky impurity particles between two arc-shaped rods.

[0015] Preferably, a plurality of second filter screens are rotatably connected to one end of the water inlet channel away from the pump cavity along the axis direction of the water inlet channel.

[0016] By adopting the above technical solution, the liquid entering the pump cavity is preliminarily filtered, reducing the possibility of large impurity particles entering the pump cavity, reducing the possibility of the impeller in the pump cavity being damaged, and reducing the possibility of impurity particles entering the rotor pump.

[0017] Preferably, it further includes a plurality of wind blades. The plurality of wind blades are respectively arranged at intervals along the circumferential direction of the rotation of the second filter screen. The plurality of wind blades are all inclined toward the same side. The plurality of second filter screens are respectively located between two adjacent wind blades and are fixedly connected to the two adjacent wind blades.

[0018] By adopting the above technical solution, when the pump extracts liquid, the flowing water drives the wind blades, causing the wind blades to rotate, and driving the second filter screen fixedly connected to the wind blades to rotate, and filtering the water entering the water inlet channel, so that particulate impurities are filtered outside. When the second filter screen rotates, the particulate impurities filtered on the second filter screen are thrown out under the action of the centrifugal force generated by the rotation, reducing the possibility of a small water inflow caused by the blockage of the second filter screen.

[0019] Preferably, the surface of the second filter screen is a corrugated surface, and the corrugated surface is smoothly transitionally connected to the surface of the wind blade.

[0020] By adopting the above technical solution, when the second filter screen rotates, the corrugated surface can reduce the resistance and facilitate the inflow of water. The transition area between the corrugated surface and the wind blade guides the impurity particles filtered on the second filter screen, facilitating the throwing out of the impurity particles.

[0021] The technical effects of the present utility model are mainly reflected in the following aspects:

[0022] 1. By providing a scraping rod and a first filter screen in the present utility model, the first filter screen can filter the water entering the rotor cavity, reducing the possibility of particulate impurities entering the rotor cavity. By driving the scraping rod to slide through a driving assembly, the surface of the first filter screen is scraped, reducing the possibility of particulate impurities accumulating and blocking on the surface of the first filter screen, thereby reducing the possibility that water cannot enter the rotor cavity to cool the rotor cavity.

[0023] 2. By providing an arc-shaped rod and a mounting ring in the present utility model, multiple arc-shaped rods can filter the water entering the rotor cavity and guide the sliding of the scraping rod, so that particulate impurities remain on the multiple arc-shaped rods. When the scraping rod scrapes the arc-shaped rods, the particulate impurities on the arc-shaped rods are discharged towards the water outlet channel side, reducing the possibility of particulate impurities accumulating on the arc-shaped rods.

[0024] 3. By providing a second filter screen and a wind blade in the present utility model, when the pump extracts liquid, the flowing water drives the wind blade, causing the wind blade to rotate, and driving the second filter screen fixedly connected to the wind blade to rotate, and filtering the water entering the water inlet channel, so that particulate impurities are filtered outside. When the second filter screen rotates, the particulate impurities filtered on the second filter screen are thrown out under the action of the centrifugal force generated by the rotation, reducing the possibility of a small water inflow caused by the blockage of the second filter screen. Description of the Drawings

[0025] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application.

[0026] Figure 2 is along Figure 1 the enlarged view at A in

[0027] Figure 3 This is a schematic diagram of the pump chamber structure according to an embodiment of the present application.

[0028] Figure 4 It is along Figure 3 The enlarged view at position B in

[0029] Figure 5 This is a schematic diagram of the first filter structure according to an embodiment of the present application.

[0030] Explanation of reference numerals: 1, pump body; 11, pump chamber; 12, water inlet channel; 13, water outlet channel; 2, canned motor; 21, rotor chamber; 22, rotor shaft; 221, impeller; 23, stator chamber; 24, stator; 3, first filter; 31, mounting ring; 32, arc-shaped rod; 4, second filter; 5, fan blade; 6, driving assembly; 61, scraping rod; 62, cam. Detailed implementation manners

[0031] The following further elaborates on the present application in conjunction with Figures 1-5 the attached drawings to make the technical solutions of the present application easier to understand and master.

[0032] An embodiment of the present application discloses a multi-stage canned pump.

[0033] Referring to Figures 1-5 , a multi-stage canned pump of this embodiment includes a pump body 1 with a pump chamber 11, a canned motor 2 with a rotor chamber 21, and a driving assembly 6. The canned motor 2 is fixedly connected to the pump body 1. The pump chamber 11 and the rotor chamber 21 are in communication. An inlet channel 12 and an outlet channel 13 communicating with the outside are provided on the pump chamber 11. A stator chamber 23 is also provided inside the canned motor 2. The stator chamber 23 and the rotor chamber 21 are separated by a stator 24 shielding sleeve. A stator 24 is fixedly connected inside the stator chamber 23. A rotor shaft 22 is rotatably connected inside the rotor chamber 21. One end of the rotor shaft 22 extends into the pump chamber 11. A plurality of impellers 221 are coaxially and fixedly connected to the end of the rotor shaft 22 located in the pump chamber 11. A first filter 3 is fixedly connected along one end of the rotor chamber 21 close to the pump chamber 11. A scraping rod 61 is slidably connected to the first filter 3. The driving assembly 6 is used to drive the sliding of the scraping rod 61.

[0034] Referring to Figures 1-5 , the first filter 3 can filter the water entering the rotor chamber 21, reducing the possibility of particulate impurities entering the rotor chamber 21. By driving the scraping rod 61 to slide through the driving assembly 6, the surface of the first filter 3 is scraped, reducing the possibility of particulate impurities accumulating and blocking on the surface of the first filter 3, thereby reducing the possibility that water flow cannot enter the rotor chamber 21 to cool the rotor chamber 21.

[0035] Referring to Figures 3-5, the first filter screen 3 includes a mounting ring 31 and a plurality of arc-shaped rods 32. The mounting ring 31 is fixedly connected to the rotor cavity 21, and the plurality of arc-shaped rods 32 are respectively fixedly connected to the mounting ring 31. The plurality of arc-shaped rods 32 are evenly distributed in a direction perpendicular to the axis of the rotor shaft 22. From the arc-shaped rod 32 close to the rotor shaft 22 to the arc-shaped rod 32 far from the rotor shaft 22, the radian gradually increases. The scraping rod 61 is slidably connected to the plurality of arc-shaped rods 32 along the radian direction of the arc-shaped rods 32. The plurality of arc-shaped rods 32 can filter the water entering the rotor cavity 21 and guide the sliding of the scraping rod 61. After filtration, the particulate impurities remain on the plurality of arc-shaped rods 32. When the scraping rod 61 scrapes the arc-shaped rods 32, the particulate impurities on the arc-shaped rods 32 are discharged toward the water outlet channel 13 side, reducing the possibility of particulate impurities accumulating on the arc-shaped rods 32.

[0036] Refer to Figures 3-5 , the axial cross-section of the mounting ring 31 is arranged in a spiral shape. It filters the water entering the rotor cavity 21, reducing the possibility of flaky impurity particles entering the rotor cavity 21 through the arc-shaped rods 32, and blocking some flaky impurity particles between two arc-shaped rods 32.

[0037] Refer to Figures 3-5 , the driving assembly 6 includes a cam 62. The cam 62 is fixedly connected to the rotor shaft 22, and the scraping rod 61 is fixedly connected to the cam 62. When the rotor shaft 22 rotates, it drives the cam 62 to rotate together, and the scraping rod 61 on the cam 62 rotates together. When the cam 62 rotates to the arc-shaped rod 32, the cam 62 drives the scraping rod 61 to scrape the particulate impurities on the arc-shaped rod 32.

[0038] Refer to Figures 1-3, at one end of the water inlet passage 12 far from the pump chamber 11, a plurality of second filters 4 are rotatably connected along the axial direction of the water inlet passage 12. The liquid entering the pump chamber 11 is preliminarily filtered, reducing the possibility of large impurity particles entering the pump chamber 11, reducing the possibility of the impeller 221 in the pump chamber 11 being damaged, and reducing the possibility of impurity particles entering the rotor pump. It further includes a plurality of fan blades 5, and the plurality of fan blades 5 are respectively arranged at intervals along the circumferential direction of rotation of the second filter 4. The plurality of fan blades 5 are all inclined towards the same side. The plurality of second filters 4 are respectively located between two adjacent fan blades 5 and are fixedly connected to the two adjacent fan blades 5. When the pump extracts liquid, the flowing water pushes the fan blades 5, causing the fan blades 5 to rotate, driving the second filter 4 fixedly connected to the fan blades 5 to rotate, and filtering the water entering the water inlet passage 12, filtering out particulate impurities. When the second filter 4 rotates, the particulate impurities filtered on the second filter 4 are thrown out under the action of the centrifugal force generated by the rotation, reducing the possibility of the second filter 4 being blocked and resulting in a small water inflow. One end of the rotor shaft 22 far from the rotor chamber 21 is coaxially and rotatably connected to the second filter 4. When the rotor shaft 22 rotates, the second filter 4 is driven to continue rotating through the frictional force between the rotor shaft 22 and the second filter 4, reducing the possibility of the second filter 4 being stuck.

[0039] Referring to Figures 1-3 , the surface of the second filter 4 is a corrugated surface, and the corrugated surface is smoothly connected to the surface of the fan blade 5 in a transitional manner. When the second filter 4 rotates, the corrugated surface can reduce the resistance and facilitate the inflow of water. The transitional area between the corrugated surface and the fan blade 5 plays a guiding role for the particulate impurities filtered on the second filter 4, facilitating the throwing out of the particulate impurities.

[0040] Of course, the above are only typical examples of this application. In addition, this application can also have many other specific implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by this application.

Claims

1. A multi-stage canned motor pump, characterized in that: The invention comprises a pump body (1) with a pump chamber (11), a shielded motor (2) with a rotor chamber (21), and a drive assembly (6); the shielded motor (2) is fixedly connected to the pump body (1); the pump chamber (11) and the rotor chamber (21) are connected; the pump chamber (11) is provided with a water inlet channel (12) and a water outlet channel (13) connected to the outside; a rotor shaft (22) is rotatably connected in the rotor chamber (21); one end of the rotor shaft (22) extends into the pump chamber (11); a plurality of impellers (221) are provided on one end of the rotor shaft (22) located in the pump chamber (11); a first filter screen (3) is provided along one end of the rotor chamber (21) close to the pump chamber (11); a scraper rod (61) is slidably connected to the first filter screen (3); and the drive assembly (6) is used to drive the scraper rod (61) to slide.

2. A multi-stage canned motor pump according to claim 1, characterized in that: The first filter screen (3) comprises a mounting ring (31) and a plurality of arc-shaped rods (32), the plurality of arc-shaped rods (32) being respectively fixedly connected to the mounting ring (31), the plurality of arc-shaped rods (32) being evenly distributed along a direction perpendicular to a rotor axis (22), and the scraper rods (61) being slidably connected to the plurality of arc-shaped rods (32) along an arc direction of the arc-shaped rods (32).

3. A multi-stage canned motor pump according to claim 2, characterized in that: The driving assembly (6) comprises a cam (62), the cam (62) is fixedly connected to the rotor shaft (22), and the scraper rod (61) is fixedly connected to the cam (62).

4. A multi-stage canned motor pump according to claim 2, characterized in that: The axial cross section of the mounting ring (31) is arranged in a spiral shape.

5. A multi-stage canned motor pump according to claim 1, characterized in that: One end of the water inlet channel (12) away from the pump chamber (11) is rotatably connected to a plurality of second filter screens (4) along the axial direction of the water inlet channel (12).

6. A multi-stage canned motor pump according to claim 5, characterized in that: It also comprises a plurality of fan blades (5), wherein the plurality of fan blades (5) are arranged at intervals along the rotation circumference of the second filter screen (4), the plurality of fan blades (5) are arranged to be inclined toward the same side, and the plurality of second filter screens (4) are respectively located between two adjacent fan blades (5) and are fixedly connected to the two adjacent fan blades (5).

7. A multi-stage canned motor pump according to claim 6, characterized in that: The surface of the second filter screen (4) is a corrugated surface, and the corrugated surface is smoothly transitionally connected to the surface of the fan blade (5).

Images