Impeller disc, centrifugal pump and integrated electric pump

Abstract

The utility model discloses a impeller disc, centrifugal pump and integral electric pump, impeller disc includes front wheel cover, rear wheel cover and rear bending type blade, and the blade is arranged between front wheel cover and rear wheel cover, and centrifugal pump includes impeller disc and pump shell, and impeller disc rotation is arranged in the pump shell, and integral electric pump includes centrifugal pump and motor, and motor drives centrifugal pump operation. Through the optimization improvement of each parameter of impeller disc, the dynamic flow field in the flow channel is optimized, the vortex in the flow channel is eliminated, and then the cavitation phenomenon is alleviated, through designing a sealing connecting part of cooperation with the pump shell on both sides of the impeller disc, the both sides of the impeller disc and the inner wall of the pump shell realize sealing respectively, the cavitation phenomenon caused by the balance hole is alleviated, through designing the cooling water channel in the inside of integral electric pump motor shell, the motor is carried out high -efficient stable heat dissipation, and the dust moisture is avoided to enter the inside of motor.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology. Specifically, it relates to impeller discs, centrifugal pumps, and integrated electric pumps. Background Technology

[0002] Electric pumps for new energy sanitation vehicles typically consist of a pre-assembled motor and pump body. The motor utilizes its internal air-cooling structure to dissipate heat from its interior. However, due to the harsh working environment of sanitation vehicles, moisture and dust in the air can easily enter the motor through the cooling airflow, reducing cooling efficiency and shortening the motor's lifespan. Furthermore, the operating status of the centrifugal pump directly affects the overall lifespan of the electric pump. Therefore, the applicant has further optimized the design of its prior application, authorized by publication number CN221568867U, for a modular integrated electric pump and sanitation vehicle, to achieve stable and efficient operation of the electric pump while ensuring its lifespan. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to provide an impeller disc, centrifugal pump and integrated electric pump that are stable in operation, reduce cavitation in centrifugal pumps and improve overall service life.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an impeller disk, including a front wheel cover and a rear wheel cover arranged coaxially, and backward-curved blades disposed between the front wheel cover and the rear wheel cover. A flow channel is formed between adjacent blades. An intake port is provided at the center of the front wheel cover. One end of the blade extends to the intake port, and the other end extends to the edge of the front wheel cover. Fluid enters the flow channel from the intake port. On a plane perpendicular to the axial direction of the impeller disk: the distance T between the blades and the contact walls of the flow channels on both sides gradually increases along the direction of the fluid in the flow channel. The width of the flow channel gradually widens along the direction of the fluid. The maximum width of the flow channel is 0.1-0.2 times the outer diameter of the impeller disk, and the inner diameter of the intake port is 0.3-0.45 times the outer diameter of the impeller disk.

[0005] In the aforementioned impeller disk, the wrap angle α of the blades is 150-170°.

[0006] The impeller disk described above has blades comprising a working surface and a concave surface opposite to the working surface; the working surface has a lower edge adjacent to the rear wheel cover and an upper edge adjacent to the front wheel cover; the inlet angle of the lower edge inlet end is β1, and the outlet angle of the lower edge outlet end is β3; the inlet angle of the upper edge inlet end is β2, and the outlet angle of the lower edge outlet end is β4; β1 > β2, β3 > β4.

[0007] A centrifugal pump includes the aforementioned impeller and pump casing. The impeller is rotatably disposed within the pump casing. One side of the pump casing has a pump inlet. The suction inlet of the impeller is coaxially corresponding to the pump inlet. An outlet pipe is connected to the circumferential side wall of the pump casing. Fluid enters the impeller through the pump inlet and suction inlet, is thrown out from the edge of the impeller, and flows out through the outlet pipe. The two side walls of the impeller and the two inner side walls of the pump casing are respectively sealed and rotatedly fitted by sealing connection components.

[0008] In the aforementioned centrifugal pump, the sealing connection components are respectively formed on the walls of both sides of the impeller disk and respectively in a sealing and rotatable fit with the inner walls of both sides of the pump casing; or the sealing connection components are respectively formed on the inner walls of both sides of the pump casing and respectively in a rotatable fit with the walls of both sides of the impeller disk; or the sealing connection components are sealingly fitted between the side wall of the impeller disk and the inner wall of the pump casing.

[0009] In the aforementioned centrifugal pump, the sealing connection component includes a convex ring, a first sealing ring, and a second sealing ring. The convex rings are respectively formed on the walls of both sides of the impeller disk, extending in a direction away from the impeller disk. A first mounting groove and a second mounting groove are respectively formed on the inner walls of both sides of the pump casing. A liner ring is embedded in the first mounting groove. The first sealing ring is mounted on the convex ring on one side of the impeller disk, and the second sealing ring is mounted on the convex ring on the other side of the impeller disk. The first sealing ring is loosely fitted within the liner ring, and the second sealing ring is loosely fitted within the second mounting groove. Grooves are formed along the circumferential direction on the outer ring surfaces of the first and second sealing rings.

[0010] The centrifugal pump described above has a main shaft that passes through the pump casing and is connected to the impeller disk for transmission. A mechanical seal is provided between the main shaft and the pump casing.

[0011] An integrated electric pump includes the aforementioned centrifugal pump and a motor, wherein the motor drives the centrifugal pump to operate; the motor includes a housing, a first end cover, and a second end cover, wherein multiple cooling channels are formed along its axial direction inside the housing, multiple first connecting channels are formed on the end face of the first end cover opposite to the housing, and multiple second connecting channels are formed on the end face of the second end cover opposite to the housing, wherein the first connecting channels and the second connecting channels are staggered, and the multiple cooling channels are connected end to end and fluid is connected through the first connecting channels and the second connecting channels.

[0012] In the aforementioned integrated electric pump, the second end cover and the pump casing of the centrifugal pump are coaxially arranged and integrally formed through a support member, and there is a waterproof gap between the pump casing of the centrifugal pump and the second end cover; a junction box is tightly fitted or integrally formed on the first end cover.

[0013] The aforementioned integrated electric pump has fluid-conducting connectors on the cooling channels at the beginning and end. A stator is fixedly installed inside the housing, and a rotor is rotatably installed inside the stator. The main shaft is fixedly installed inside the rotor. One end of the main shaft is mounted on the first end cover via a bearing, and the other end of the main shaft is mounted on the second end cover via another bearing. The main shaft directly penetrates into the centrifugal pump and is connected to the impeller disk for transmission. A double-framework combined sealing ring is installed between the main shaft and the second end cover.

[0014] The technical solution of this utility model has achieved the following beneficial technical effects:

[0015] 1. By optimizing and improving various parameters of the impeller disk, the dynamic flow field in the flow channel was optimized, the vortex in the flow channel was eliminated, and the cavitation phenomenon was reduced.

[0016] 2. By designing a sealing connection component that mates with the pump casing on each side of the impeller disk, the two sides of the impeller disk are sealed to the inner wall of the pump casing, thereby reducing cavitation caused by the balance hole.

[0017] 3. By designing cooling water channels inside the integrated electric pump motor housing, the motor can be efficiently and stably cooled, while preventing dust and moisture from entering the motor. Attached Figure Description

[0018] Figure 1 A cross-sectional structural diagram of the impeller disk of this utility model;

[0019] Figure 2 A three-dimensional structural diagram of the impeller disk of this utility model with the front wheel cover removed;

[0020] Figure 3 A schematic diagram of the blade arrangement of the impeller disk of this utility model;

[0021] Figure 4 A three-dimensional structural diagram of the centrifugal pump of this utility model;

[0022] Figure 5 A cross-sectional structural diagram of the centrifugal pump of this utility model;

[0023] Figure 6 A three-dimensional structural diagram of the integrated electric pump of this utility model;

[0024] Figure 7 A three-dimensional structural diagram of the integrated electric pump dismantling controller of this utility model;

[0025] Figure 8 A longitudinal cross-sectional view of the integrated electric pump dismantling controller of this utility model;

[0026] Figure 9This utility model presents a schematic diagram showing the connection of the cooling channel, the first connecting channel, and the second connecting channel on the integrated electric pump.

[0027] The reference numerals in the figure are as follows: 1-1-Front wheel cover; 1-2-Rear wheel cover; 1-3-Blade; 1-4-Sealing connection component; 1-5-Flow channel; 1-6-Inlet; 1-7-Shaft hole; 1-8-Working surface; 1-81-Lower edge; 1-82-Upper edge; 1-9-Concave surface; 1-10-Front end edge;

[0028] 2-1-Front pump casing; 2-2-Pump inlet; 2-3-Outlet pipe; 2-4-Pump cover; 2-5-Sleeve ring; 2-6-First sealing ring; 2-7-First mounting groove; 2-8-Second mounting groove; 2-9-Second sealing ring; 2-10-Mechanical seal; 2-11-Main shaft; 2-12-Locking cover; 2-13-Impeller disc;

[0029] 3-1-Motor; 3-2-Centrifugal pump; 3-3-Controller; 3-4-Housing housing; 3-5-First end cover; 3-6-Second end cover; 3-7-Junction box; 3-8-Connector; 3-9-Stator; 3-10-Rotor; 3-11-Bearing; 3-12-Double skeleton combined sealing ring; 3-13-First connecting channel; 3-14-Cooling flow channel; Second connecting channel. Detailed Implementation

[0030] Example 1

[0031] In this embodiment, the impeller disk, as... Figure 1-2 As shown, based on the backward-curved centrifugal impeller, targeted optimizations and improvements are made. The impeller disc includes a front cover 1-1 and a rear cover 1-2 arranged coaxially, and backward-curved blades 1-3 arranged between the front cover 1-1 and the rear cover 1-2. Flow channels 1-5 are formed between adjacent blades 1-3. An inlet 1-6 is opened at the center of the front cover 1-1. One end of the blade 1-3 extends to the inlet 1-6, and the other end extends to the edge of the front cover 1-1. Fluid enters the flow channel 1-5 from the inlet 1-6. A through pressure balance hole is opened on the rear cover 1-2 at the inlet end of each flow channel 1-5.

[0032] Because the impeller rotates at high speed during operation, it causes significant agitation of the water, leading to vortices and cavitation within flow channels 1-5. Based on these issues, optimizations and improvements are implemented, specifically as follows: Figure 2-3As shown, on a plane perpendicular to the impeller disk axis: the distance T between the blades 1-3 and the contact walls of the two flow channels 1-5 gradually increases along the fluid direction within the flow channels 1-5. In this embodiment, six blades 1-3 are used. The width of the flow channels 1-5 gradually widens along the fluid direction. The maximum width of the flow channels 1-5 is 0.1-0.2 times the outer diameter of the impeller disk, specifically 0.11 times. The inner diameter of the suction port 1-6 is 0.3-0.45 times the outer diameter of the impeller disk, specifically 0.35 times. At the same time, the wrap angle α of the blades 1-3 is 150-170°, specifically 165°. By optimizing the width of the flow channels 1-5, increasing the density of the blades 1-3, and increasing the wrap angle of the blades 1-3 (i.e., the blade length), the diameter of the suction port 1-6 is also increased, thereby eliminating vortices and reducing cavitation.

[0033] Further optimization of the angle and shape of blades 1-3, such as... Figure 2-3 As shown, the blade 1-3 includes a working surface 1-8 and a concave surface 1-9 opposite to the working surface 1-8. The concave surface 1-9 refers to the approximately arc-shaped concave side of the blade 1-3 where the two ends of the blade 1-3 are close to each other along the overall length of the blade 1-3. The working surface 1-8 has a lower edge 1-81 adjacent to the rear wheel cover 1-2 and an upper edge 1-82 adjacent to the front wheel cover 1-1. The inlet angle of the lower edge 1-81 is β1, and the outlet angle of the lower edge 1-81 is β3. The inlet angle of the upper edge 1-82 is β2, and the outlet angle of the lower edge 1-81 is β4. β1 > β2, β3 > β4. In this embodiment, the angle range of β1 is 20-30°, the angle range of β2 is 4-8°, and the angle range of β3 and β4 is 25-30°, where the difference between β3 and β4 is greater than 0 and less than 5. Under this angle design, as shown... Figure 2 As shown, blade 1-3 is twisted, meaning that in the direction of impeller rotation, blade 1-3 gradually tilts in the direction of rotation from the side adjacent to the rear wheel cover 1-2 to the side adjacent to the front wheel cover 1-1, and the degree of tilt gradually decreases from the inlet end to the outlet end of blade 1-3. The leading edge 1-10 of the inlet end of blade 1-3 forms an arc shape due to the twist. Due to the optimized blade design, the dynamic flow field within the flow channel 1-5 is optimized when the blade contacts the fluid, eliminating vortices within the flow channel and thus reducing cavitation.

[0034] Example 2

[0035] The centrifugal pump in this embodiment, such as Figure 2-3As shown, the pump includes the impeller disk 2-13 and the pump casing as in Embodiment 1. The impeller disk 2-13 is rotatably disposed inside the pump casing. One side of the pump casing has a pump port 2-2. The suction port 1-6 of the impeller disk 2-13 is coaxially corresponding to the pump port 2-2. An outlet pipe 2-3 is connected to the circumferential side wall of the pump casing. Fluid enters the impeller disk 2-13 through the pump port 2-2 and the suction port 1-6, and then is thrown out from the edge of the impeller disk 2-13 and flows out through the outlet pipe 2-3. The two side walls of the impeller disk 2-13 and the two side inner walls of the pump casing are respectively sealed and rotated together by sealing connection components 1-4.

[0036] Specifically, such as Figure 5 As shown, the pump casing consists of a front pump casing 2-1 and a pump cover 2-4. The front pump casing 2-1 is the main structure of the specific pump chamber. The impeller disk 2-13 is set inside the front pump casing 2-1. The pump cover 2-4 is fixed and sealed to the front pump casing 2-1 by screws.

[0037] like Figure 5 The sealing connection components 1-4 shown are respectively formed on the wall surfaces of both sides of the impeller disk 2-13, and respectively sealed and rotated with the inner wall surfaces of both sides of the pump casing. In this embodiment, the following structure is adopted: the sealing connection component 1-4 includes a convex ring, a first sealing ring 2-6 and a second sealing ring 2-9. Convex rings are formed on the wall surfaces of both sides of the impeller disk 2-13, and the convex rings extend in a direction away from the impeller disk 2-13. The pressure balance hole is arranged inside the range of the convex ring. A first mounting groove 2-7 and a second mounting groove 2-8 are respectively opened on the inner wall surfaces of both sides of the pump casing. A liner ring 2-5 is embedded in the first mounting groove 2-7. The first sealing ring 2-6 is installed on the convex ring on one side of the impeller disk 2-13, and the second sealing ring 2-9 is installed on the convex ring on the other side of the impeller disk 2-13. The first sealing ring 2-6 is loosely fitted in the liner ring 2-5, and the second sealing ring 2-9 is loosely fitted in the second mounting groove 2-8. Grooves are opened along the circumferential direction on the outer ring surfaces of the first sealing ring 2-6 and the second sealing ring 2-9. The main shaft 2-11 is inserted into the pump casing and is connected to the impeller disk 2-13 for transmission. A mechanical seal 2-10 is provided between the main shaft 2-11 and the pump casing.

[0038] In other embodiments, sealing connection components 1-4 can be formed on the inner walls of both sides of the pump casing and rotatably engaged with the two side walls of the impeller disk. For example, a sealing protrusion ring can be formed on the inner wall of the pump casing and sealed against the surface of the impeller disk. In other embodiments, sealing connection components 1-4 can be sealed between the side wall of the impeller disk and the inner wall of the pump casing. For example, a seal can be installed between the impeller disk and the pump casing, and the seal can be stabilized by an external structure, such as a bracket.

[0039] Example 3

[0040] The integrated electric pump in this embodiment, such as Figure 6-7As shown, the system includes a centrifugal pump 3-2, a motor 3-1, and a controller 3-3, as described in Example 2. The motor 3-1 drives the centrifugal pump 3-2, and the controller 3-3 is mounted on one side via a bracket. Figure 8-9 As shown, the motor 3-1 includes a housing 3-4, a first end cover 3-5, and a second end cover 3-6. Multiple cooling channels 3-14 are formed along the axial direction inside the housing 3-4. Multiple first connecting channels 3-13 are formed on the end face of the first end cover 3-5 relative to the housing 3-4. Multiple second connecting channels 3-15 are formed on the end face of the second end cover 3-6 relative to the housing 3-4. The first connecting channels 3-13 and the second connecting channels 3-15 are staggered. The multiple cooling channels 3-14 are connected end-to-end and allow fluid to flow through them, forming an S-shaped, winding flow channel on the housing of the motor 3-1. This achieves cooling of the motor, improves the motor's operational stability, and prevents dust and moisture from entering the motor's interior.

[0041] like Figure 8 As shown, the second end cover 3-6 and the pump cover 2-4 of the centrifugal pump 3-2 are coaxially arranged and integrally formed with a support, which improves the installation and connection strength and completely avoids the main shaft 2-11 from bearing lateral forces. Furthermore, there is a waterproof gap between the pump casing of the centrifugal pump 3-2 and the second end cover 3-6 to prevent high-pressure water from seeping into the motor. The main shaft 2-11 directly penetrates into the centrifugal pump 3-2 and is connected to the impeller disk 2-13 for transmission, forming a direct coaxial connection. This results in higher and more stable transmission efficiency, achieving a flow rate of 50 m³ / h at a speed of 2900-3500 rpm. 3 / h, pressure 110MPa, centrifugal pump port 2-2 adopts DN80, outlet pipe 2-3 adopts DN65; junction box 3-7 is tightly fitted or integrally formed on the first end cover 3-5.

[0042] like Figure 8-9 As shown, the cooling channels 3-14 at the beginning and end are respectively connected to the fluid flow via connectors 3-8; a stator 3-9 is fixedly installed inside the outer casing 3-4, and a rotor 3-10 is rotatably installed inside the stator 3-9. The main shaft 2-11 is fixedly installed inside the rotor 3-10. One end of the main shaft 2-11 is mounted on the first end cover 3-5 through a bearing 3-11, and the other end of the main shaft 2-11 is mounted on the second end cover 3-6 through another bearing 3-11. A double-framework combined sealing ring 3-12 is installed between the main shaft 2-11 and the second end cover 3-6.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. An impeller disk, characterized in that, The device includes a front wheel cover (1-1) and a rear wheel cover (1-2) arranged coaxially, and a backward-curved blade (1-3) disposed between the front wheel cover (1-1) and the rear wheel cover (1-2). A flow channel (1-5) is formed between adjacent blades (1-3). An intake port (1-6) is provided at the center of the front wheel cover (1-1). One end of each blade (1-3) extends to the intake port (1-6), and the other end extends to the edge of the front wheel cover (1-1). Fluid flows from the intake port. The inlet (1-6) enters the flow channel (1-5); on a plane perpendicular to the axial direction of the impeller disk: the distance T between the blades (1-3) and the contact walls of the two flow channels (1-5) gradually increases along the fluid direction in the flow channel (1-5), the width of the flow channel (1-5) gradually widens along the fluid direction, the maximum width of the flow channel (1-5) is 0.1-0.2 times the outer diameter of the impeller disk, and the inner diameter of the inlet (1-6) is 0.3-0.45 times the outer diameter of the impeller disk.

2. The impeller disk according to claim 1, characterized in that, The wrap angle α of the blades (1-3) is 150-170°.

3. The impeller disk according to claim 1, characterized in that, The blade (1-3) includes a working surface (1-8) and a concave surface (1-9) opposite to the working surface (1-8); the working surface (1-8) has a lower edge (1-81) adjacent to the rear wheel cover (1-2) and an upper edge (1-82) adjacent to the front wheel cover (1-1); the inlet angle of the lower edge (1-81) is β1, and the outlet angle of the lower edge (1-81) is β3; the inlet angle of the upper edge (1-82) is β2, and the outlet angle of the lower edge (1-81) is β4; β1 > β2, β3 > β4.

4. A centrifugal pump, characterized in that, The pump casing includes an impeller disk (2-13) as described in any one of claims 1-3 and a pump housing. The impeller disk (2-13) is rotatably disposed inside the pump housing. One side of the pump housing has a pump port (2-2). The suction port (1-6) of the impeller disk (2-13) is coaxially corresponding to the pump port (2-2). An outlet pipe (2-3) is connected to the circumferential side wall of the pump housing. Fluid enters the impeller disk (2-13) through the pump port (2-2) and the suction port (1-6) and is thrown out from the edge of the impeller disk (2-13) and flows out through the outlet pipe (2-3). The two side walls of the impeller disk (2-13) and the two side inner walls of the pump housing are respectively sealed and rotatedly engaged by sealing connection components (1-4).

5. The centrifugal pump according to claim 4, characterized in that, The sealing connection components (1-4) are respectively formed on the wall surfaces of both sides of the impeller disk (2-13) and respectively sealed and rotatedly engaged with the inner wall surfaces of both sides of the pump casing; or the sealing connection components (1-4) are respectively formed on the inner wall surfaces of both sides of the pump casing and respectively rotatedly engaged with the two wall surfaces of the impeller disk; or the sealing connection components (1-4) are sealed and engaged between the side wall of the impeller disk and the inner wall of the pump casing.

6. The centrifugal pump according to claim 4, characterized in that, The sealing connection component (1-4) includes a convex ring, a first sealing ring (2-6), and a second sealing ring (2-9). The convex rings are formed on the walls on both sides of the impeller disk (2-13), and the convex rings extend in a direction away from the impeller disk (2-13). A first mounting groove (2-7) and a second mounting groove (2-8) are respectively opened on the inner walls on both sides of the pump casing. A liner ring (2-5) is embedded in the first mounting groove (2-7). The first sealing ring (2-6) is installed on the convex ring on one side of the impeller disk (2-13), and the second sealing ring (2-9) is installed on the convex ring on the other side of the impeller disk (2-13). The first sealing ring (2-6) is fitted with the liner ring (2-5) with a clearance, and the second sealing ring (2-9) is fitted with the second mounting groove (2-8) with a clearance. Grooves are opened along the circumferential direction on the outer ring surfaces of the first sealing ring (2-6) and the second sealing ring (2-9).

7. The centrifugal pump according to any one of claims 4-6, characterized in that, The main shaft (2-11) passes through the pump casing and is connected to the impeller disk (2-13) for transmission. A mechanical seal (2-10) is provided between the main shaft (2-11) and the pump casing.

8. An integrated electric pump, characterized in that, The device includes a centrifugal pump (3-2) and a motor (3-1) as described in any one of claims 4-7, wherein the motor (3-1) drives the centrifugal pump (3-2) to operate; the motor (3-1) includes a housing (3-4), a first end cap (3-5), and a second end cap (3-6); the housing (3-4) has a plurality of cooling channels (3-14) formed along its axial direction; the first end cap (3-5) has a plurality of first connecting channels (3-13) formed on its end face opposite to the housing (3-4); the second end cap (3-6) has a plurality of second connecting channels (3-15) formed on its end face opposite to the housing (3-4); the first connecting channels (3-13) and the second connecting channels (3-15) are staggered; the plurality of cooling channels (3-14) are connected end to end and fluid is connected through the first connecting channels (3-13) and the second connecting channels (3-15).

9. The integrated electric pump according to claim 8, characterized in that, The second end cover (3-6) and the pump casing of the centrifugal pump (3-2) are coaxially arranged and integrally formed by a support member, and there is a waterproof gap between the pump casing of the centrifugal pump (3-2) and the second end cover (3-6); a junction box (3-7) is tightly fitted or integrally formed on the first end cover (3-5).

10. The integrated electric pump according to claim 8, characterized in that, The cooling channels (3-14) at the beginning and end are respectively connected to the fluid flow joints (3-8); a stator (3-9) is fixedly installed inside the outer shell (3-4), and a rotor (3-10) is rotatably installed inside the stator (3-9). The main shaft (2-11) is fixedly installed inside the rotor (3-10). One end of the main shaft (2-11) is installed on the first end cover (3-5) through a bearing (3-11), and the other end of the main shaft (2-11) is installed on the second end cover (3-6) through another bearing (3-11). The main shaft (2-11) is directly inserted into the centrifugal pump (3-2) and connected to the impeller disk (2-13) for transmission. A double-framework combined sealing ring (3-12) is installed between the main shaft (2-11) and the second end cover (3-6).

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