Tightly-connected permanent magnet direct drive pump

Abstract

The invention discloses a tightly connected permanent magnet direct drive pump, which belongs to the field of permanent magnet pumps, and comprises a front cover, a rear cover, an impeller, a magnetic bag, a pump shaft, a bearing and a driving assembly, the front cover and the driving assembly are both provided with inner cavities, the inner cavities of the front cover and the driving assembly are opposite, and the outer end of the front cover is connected with the outer end of the driving assembly through a bolt; the pump shaft penetrates through the impeller and the magnetic bag to be inserted into the front cover and the rear cover respectively, the pump shaft is sleeved with the bearing and located between an inner hole of the magnetic bag and the pump shaft, the exterior of the rear cover cylinder is installed in a cavity of the driving assembly, and the driving assembly comprises an exciting winding, a junction box and a rear sealing cover. The exciting winding is installed on the rear sealing cover support, the connecting end is close to the inner wall of one side of the rear sealing cover, a shell, close to one end of the exciting winding, of the junction box is fixedly connected with the rear sealing cover, the exciting winding is electrically connected with the junction box, and the connecting position of the exciting winding and the junction box is sealed in the rear sealing cover.

Description

Technical Field

[0001] The present invention belongs to the technical field of permanent magnet pumps, and more specifically, relates to a tightly connected permanent magnet direct-drive pump. Background Art

[0002] A permanent magnet pump is a pump that uses magnetic transmission to drive fluids. Its structural features enable it to perform well in handling corrosive, volatile or high-temperature fluids. A common permanent magnet pump is a pump body driven by magnetic field force. Its structure is composed of three parts: a pump head, a permanent magnet transmission device, and other components such as a motor. The pump head part mainly uses a permanent magnet rotor as an internal magnet to connect the impeller to drive the impeller; the magnetic drive device part mainly consists of an external magnet, an isolation sleeve, a motor and other components. The external magnet rotor is usually connected to the motor through a shaft, and the rotation of the shaft drives the external magnet to generate a magnetic field that interacts with the permanent magnet rotor. However, this structure is complex and the magnetic transmission belt The path is long and the magnetic transmission efficiency is low; another method is to connect the inner magnetic outer ring of the pump head to the permanent magnet motor so that the coil of the permanent magnet motor acts as an external magnet on the permanent magnet rotor to form the internal magnet, thereby achieving the purpose of magnetically driving the impeller. This structure is prone to leakage and loose line connection at the connection between the pump head and the motor, causing damage to the pump and motor; another method is to install the coil outside the pump head, and directly connect the coil to the magnetic field of the permanent magnet rotor through the driver to drive the impeller, but the connection between the coil and the external motor is easily damaged or even falls off due to force, resulting in a decrease in the magnetic drive ability of the pump. Therefore, a permanent magnet direct-drive pump with high magnetic transmission efficiency, tight connection and not easily eroded and damaged is needed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a tightly connected permanent magnet direct drive pump, which can meet the requirements of the permanent magnet direct drive pump having high magnetic transmission efficiency, tight connection and not susceptible to erosion and damage.

[0004] The present invention discloses a tightly connected permanent magnet direct-drive pump, comprising a front cover, a rear cover, an impeller, a magnetic capsule, a pump shaft, a bearing and a drive assembly. The front cover and the drive assembly are both provided with an inner cavity and the inner cavities of the two are opposite to each other. The outer end of the front cover is connected to the outer end of the drive assembly by bolts. One end of the impeller is sleeved in the front cover cavity, and the other end is fixedly connected to one end of the magnetic capsule. The rear cover is set in a cylindrical shape, and the other end of the magnetic capsule is sleeved in the interior of the rear cover cylinder. The pump shaft passes through the impeller and the magnetic capsule, and the two ends of the pump shaft are respectively inserted into the front cover and the rear cover. The bearing is sleeved outside the pump shaft and is located between the inner hole of the magnetic capsule and the pump shaft. The outside of the rear cover cylinder is installed in the drive assembly cavity. A plurality of permanent magnet rotors are integrated in the magnetic capsule. When the magnetic capsule rotates, the permanent magnet rotor generates a fixed magnetic field to drive the pump shaft. An excitation winding is provided in the dynamic component, and a plurality of permanent magnet rotors and the excitation winding are evenly distributed around the axis of the pump shaft. The electromagnetic field generated by the excitation winding after power is supplied corresponds to the magnetic field generated by the plurality of permanent magnet rotors, so as to reduce the loss when the interaction force between the electromagnetic field and the permanent magnet magnetic field is applied to the impeller. The driving component also includes a junction box and a rear cover. The excitation winding is mounted on the rear cover bracket and the connecting end is close to the inner wall of one side of the rear cover. The outer shell of the junction box close to one end of the excitation winding is fixedly connected to the rear cover. The excitation winding is electrically connected to the junction box, and the connection between the excitation winding and the junction box is enclosed inside the rear cover to prevent damage to the circuit. The external power supply is electrically connected to the excitation winding through the wiring terminals in the junction box.

[0005] As a further improvement of the present invention, it also includes a pair of sealing rings, the end where the rear cover is connected to the front cover is provided with a convex edge, and a sealing ring is sleeved on the convex edge; a sealing ring is sleeved on the end of the excitation winding close to the rear cover, and a sealing step is provided on the end of the rear cover close to the excitation winding, and the sealing ring is sleeved on the sealing step to prevent the liquid in the permanent magnet direct drive pump from flowing into the power supply part and causing damage to the pump body.

[0006] As a further improvement of the present invention, a liquid inlet and a liquid outlet are provided on the outside of the front cover, the liquid inlet is provided in the central area of ​​the front cover, an axis frame is provided in the inner cavity of the front cover, one end of the axis frame is fixedly connected to the liquid inlet, and the other end is provided with a slot matching the pump shaft, a slot matching the pump shaft is provided at the bottom of the rear cover cylinder, and both ends of the pump shaft are respectively inserted into the slots of the axis frame and the rear cover, thereby strengthening the connection strength between the pump shaft and the front cover and the rear cover.

[0007] As a further improvement of the present invention, the excitation winding is a silicon steel sheet enameled wire winding, the outside of the excitation winding is covered with a sealed insulating layer, and the inside and outside of the excitation winding are filled with epoxy resin glue to prevent damage to the excitation winding after leakage, thereby improving safety.

[0008] As a further improvement of the present invention, the inner cavity of the front cover is provided with a plurality of gradually expanding concave rings, which increase the flow space in the inner cavity of the front cover and increase the head, flow rate and efficiency of the permanent magnet direct-drive pump; three extended guide plates are provided on the shaft frame, which are connected to the inner wall of the liquid inlet and are symmetrically distributed with the shaft frame slot as the center, thereby ensuring the connection strength while increasing the flow of the liquid inlet to prevent the generation of vortices, thereby improving the head, flow rate and efficiency of the permanent magnet direct-drive pump.

[0009] As a further improvement of the present invention, a locking sleeve is provided below one end of the junction box away from the excitation winding, and the external power cable is inserted into the locking sleeve and connected to the internal circuit of the junction box to realize power supply to the excitation winding. A locking nut is provided at the rear end of the locking sleeve, which can lock and fix the external power cable to ensure the stability of the connection and protect the cable joint from damage.

[0010] As a further improvement of the present invention, it also includes a thrust ring, which includes a front thrust ring and a rear thrust ring. A thrust washer is provided at the front end of the impeller. The front thrust ring is coupled and linked to the thrust washer. The front thrust ring is installed on a concave ring in the inner cavity of the front cover near the liquid inlet, thereby increasing the ability of the impeller to resist axial force, protecting the impeller and the front thrust ring from wear, and maintaining the position of the impeller in the pump body to control the vertical and horizontal accuracy of the excitation winding and the magnetic capsule to form a complete electromagnetic field. The rear thrust ring is sleeved on the pump shaft and is located at the connection between the magnetic capsule and the rear cover, thereby improving the stability of the permanent magnet direct drive pump.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the excitation winding is installed on the rear cover bracket and driven by directly connecting to the external motor, thereby optimizing the mechanical transmission structure of the impeller and the coupling, shortening the magnetic transmission distance to improve the magnetic force transmission efficiency; the excitation winding is connected to the motor through a terminal box fixed to the pump body, and the connection between the excitation winding and the terminal box is located inside the rear cover, avoiding exposure of the connection line to the working end of the impeller or the outside of the pump body, reducing the risk of erosion and damage to the connection line; the connection between the terminal box and the external motor A locking sleeve is provided, and a locking nut is provided at the rear end of the locking sleeve to prevent the cable connector of the external motor from being damaged by erosion or pulling; the excitation winding is a silicon steel sheet enameled wire winding, the outside of the excitation winding is covered with a sealed insulation layer, and the inside and outside are filled with epoxy resin glue to prevent damage to the excitation winding after leakage and improve safety; the inner cavity of the front cover is provided with a step-by-step expanding concave ring and a guide plate to increase the head, flow and efficiency of the permanent magnet direct-drive pump; a thrust ring is provided to control the vertical and horizontal accuracy of the excitation winding and the magnetic capsule to form a complete electromagnetic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the explosion structure of the present invention; Figure 3It is a schematic diagram of the exploded structure of the driving assembly of the present invention; Figure 4 It is a front cross-sectional schematic diagram of a driving assembly of the present invention; Figure 5 It is a front cross-sectional schematic diagram of the present invention; Figure 6 It is a front view and cross-sectional schematic diagram of the impeller pump shaft connection of the present invention; Figure 7 It is a schematic diagram of the structure inside the front cover cavity of the present invention.

[0013] Description of the numbers in the figure: Front cover 1; liquid inlet 11; liquid outlet 12; shaft frame 13; guide plate 131; concave ring 14; rear cover 2; convex edge 21; impeller 3; thrust washer 31; magnetic capsule 4; permanent magnet rotor 41; pump shaft 5; bearing 6; drive assembly 7; excitation winding 71; terminal box 72; locking sleeve 721; rear cover 73; sealing step 731; thrust ring 8; front thrust ring 81; rear thrust ring 82; sealing ring 9. DETAILED DESCRIPTION

[0014] Specific embodiment 1: Please refer to Figure 1-Figure 7 The present invention relates to a tightly connected permanent magnet direct drive pump, comprising a front cover 1, a rear cover 2, an impeller 3, a magnetic capsule 4, a pump shaft 5, a bearing 6 and a driving assembly 7. The front cover 1 and the driving assembly 7 are both provided with an inner cavity and the inner cavities of the two are opposite to each other. The outer end of the front cover 1 is connected to the outer end of the driving assembly 7 by bolts. One end of the impeller 3 is sleeved in the cavity of the front cover 1, and the other end is fixedly connected to one end of the magnetic capsule 4. The rear cover 2 is set to be cylindrical, and the other end of the magnetic capsule 4 is sleeved in the interior of the rear cover 2 cylinder. The pump shaft 5 passes through the impeller 3 and the magnetic capsule 4, and the two ends of the pump shaft 5 are respectively inserted into the interior of the front cover 1 and the rear cover 2. The bearing 6 is sleeved outside the pump shaft 5 and is located between the inner hole of the magnetic capsule 4 and the pump shaft 5. The outer part of the rear cover 2 cylinder is installed in the cavity of the driving assembly 7. A plurality of evenly distributed permanent magnet rotors 41 are integrated in the magnetic capsule 4. When the magnetic capsule 4 rotates, the permanent magnet rotor 41 generates a fixed magnetic field.

[0015] In a further embodiment, Figure 3As shown, the drive assembly 7 includes an excitation winding 71, a terminal box 72 and a rear cover 73. The inner side of the rear cover 73 is fixedly connected to the outer side of the terminal box 72. The excitation winding 71 is installed on the bracket of the rear cover 73 and one end is in contact with the end surface of the terminal box 72. The excitation winding 71 is electrically connected to the terminal box 72, and the connection is sealed inside the rear cover 73 to prevent circuit damage. One end of the terminal box 72 close to the excitation winding 71 is fixedly connected to the rear cover 73, and an external power supply is electrically connected to the excitation winding 71 through a terminal in the terminal box 72. The plurality of permanent magnet rotors 41 and the excitation winding 71 are evenly distributed around the axis of the pump shaft 5. The electromagnetic field generated by the excitation winding 71 after power is applied corresponds to the magnetic field generated by the plurality of permanent magnet rotors 41. Group 71 generates an electromagnetic field, which interacts with the permanent magnet rotor 41 in the magnetic capsule 4, thereby driving the magnetic capsule 4 to rotate. The excitation winding 71 is a silicon steel sheet enameled wire winding, and the outside of the excitation winding 71 is coated with a sealed insulation layer. The inside and outside of the excitation winding 71 are filled with epoxy resin glue to prevent damage to the excitation winding 71 after leakage, thereby improving safety. A locking sleeve 721 is provided below the end of the junction box 72 away from the excitation winding 71. The external power cable is inserted into the locking sleeve 721 and connected to the internal circuit of the junction box 72 to realize power supply to the excitation winding 71. A locking nut is provided at the tail end of the locking sleeve 721, which can lock and fix the external power cable to ensure the connection stability and protect the cable joint from damage.

[0016] In a further embodiment, Figure 4-Figure 5 As shown, it also includes a pair of sealing rings 9. The end where the rear cover 2 is connected to the front cover 1 is provided with a convex edge 21, and a sealing ring 9 is sleeved on the convex edge 21; the end of the excitation winding 71 close to the rear cover 73 is sleeved with a sealing ring 9, and the end of the rear cover 73 close to the excitation winding 71 is provided with a sealing step 731, and the sealing ring 9 is sleeved on the sealing step 731 to prevent the liquid in the permanent magnet direct drive pump from flowing into the power supply part 7 and causing damage to the pump body.

[0017] In a further embodiment, Figure 2 and Figure 7 As shown, a liquid inlet 11 and a liquid outlet 12 are provided on the outer side of the front cover 1, the liquid inlet 11 is provided in the central area of ​​the front cover 1, an axis frame 13 is provided in the inner cavity of the front cover 1, one end of the axis frame 13 is fixedly connected to the liquid inlet 11, and the other end is provided with a slot matching the pump shaft 5, a slot matching the pump shaft 5 is provided at the bottom of the inner tube of the rear cover 2, and both ends of the pump shaft 5 are respectively inserted into the slots of the axis frame 13 and the rear cover 2, so as to strengthen the connection strength between the pump shaft 5 and the front cover 1 and the rear cover 2.

[0018] In a further embodiment, Figure 7As shown, the inner cavity of the front cover 1 is provided with a plurality of gradually expanding concave rings 14, which increase the flow space of the inner cavity of the front cover 1 and improve the head, flow rate and efficiency of the permanent magnet direct-drive pump; the shaft frame 13 is provided with three extended guide plates 131, which are connected to the inner wall of the liquid inlet 11 and are symmetrically distributed with the slot of the shaft frame 13 as the center, thereby ensuring the connection strength while increasing the flow of the liquid inlet 11 to prevent the generation of vortices, thereby improving the head, flow rate and efficiency of the permanent magnet direct-drive pump.

[0019] In a further embodiment, Figure 6 As shown, it also includes a thrust ring 8, which includes a front thrust ring 81 and a rear thrust ring 82. A thrust washer 31 is provided at the front end of the impeller 3. The front thrust ring 81 is coupled and linked to the thrust washer 31. The front thrust ring 81 is installed on a concave ring 14 in the inner cavity of the front cover 1 near the liquid inlet 11, so as to increase the ability of the impeller 3 to resist axial force, protect the impeller 3 and the front thrust ring 81 from wear, maintain the position of the impeller 3 in the pump body, and control the vertical and horizontal accuracy of the excitation winding 71 and the magnetic capsule 4 to form a complete electromagnetic field. The rear thrust ring 82 is sleeved on the pump shaft 5 and is located at the connection between the magnetic capsule 4 and the rear cover 2, so as to improve the stability of the permanent magnet direct drive pump.

[0020] Insert the external power cable into the locking sleeve 721 and connect it to the line in the junction box 72, lock the locking nut at the lower end of the locking sleeve 721, start the external power supply to energize the excitation winding 71 connected in the junction box 72 through the junction box 72, and the excitation winding 71 generates an electromagnetic field. The electromagnetic field interacts with the permanent magnet rotor 41 on the magnetic capsule 4, thereby driving the permanent magnet rotor 41 in the magnetic capsule 4 to rotate. The permanent magnet rotor 41 directly drives the impeller 3 to rotate along the central axis of the pump shaft 5, and the impeller 3 discharges the liquid in the front cover 1 from the liquid outlet 12. The atmospheric pressure in the front cover 1 is lower than the external atmospheric pressure. A pressure difference is formed inside and outside the front cover 1, and the liquid is sucked into the impeller 3 from the liquid inlet 11. Then, the liquid is transported to the liquid outlet 12 through the rotation of the impeller 3 and is discharged under pressure from the liquid outlet 12.

Claims

1. A tightly connected permanent magnet direct drive pump, characterized in that: The invention comprises a front cover (1), a rear cover (2), an impeller (3), a magnetic capsule (4), a pump shaft (5), a bearing (6) and a drive assembly (7), wherein the front cover (1) and the drive assembly (7) are both provided with inner cavities and the inner cavities of the two inner cavities are opposite to each other, the outer end of the front cover (1) is connected to the outer end of the drive assembly (7) by bolts, one end of the impeller (3) is sleeved in the cavity of the front cover (1), and the other end is fixedly connected to one end of the magnetic capsule (4), the rear cover (2) is set to be cylindrical, and the magnetic capsule (4) is ) and the other end is sleeved in the interior of the rear cover (2) cylinder. The pump shaft (5) passes through the impeller (3) and the magnetic capsule (4), and the two ends of the pump shaft (5) are respectively inserted into the interior of the front cover (1) and the rear cover (2). The bearing (6) is sleeved outside the pump shaft (5) and is located between the inner hole of the magnetic capsule (4) and the pump shaft (5). The exterior of the rear cover (2) cylinder is installed in the cavity of the drive component (7). A plurality of permanent magnet rotors (41) are integrated in the magnetic capsule (4). When the magnetic capsule (4) rotates, the permanent magnets The rotor (41) generates a fixed magnetic field. An excitation winding (71) is provided in the drive assembly (7). The plurality of permanent magnet rotors (41) and the excitation winding (71) are evenly distributed around the axis of the pump shaft (5). The electromagnetic field generated by the excitation winding (71) after power is supplied corresponds to the magnetic field generated by the plurality of permanent magnet rotors (41). The drive assembly (7) further comprises a junction box (72) and a rear cover (73). The excitation winding (71) is mounted on a bracket of the rear cover (73) and a connection end is close to an inner wall of one side of the rear cover (73). The outer shell of the junction box (72) close to one end of the excitation winding (71) is fixedly connected to the rear cover (73). The excitation winding (71) is electrically connected to the junction box (72). The connection between the excitation winding (71) and the junction box (72) is enclosed inside the rear cover (73). The external power supply is electrically connected to the excitation winding (71) via a connection terminal in the junction box (72).

2. A tightly connected permanent magnet direct drive pump according to claim 1, characterized in that: The front cover (1) is provided with a liquid inlet (11) and a liquid outlet (12) on the outside, the liquid inlet (11) being provided in the central area of ​​the front cover (1), the inner cavity of the front cover (1) being provided with a shaft frame (13), one end of the shaft frame (13) being fixedly connected to the liquid inlet (11), and the other end being provided with a slot matching the pump shaft (5), the bottom of the inner cylinder of the rear cover (2) being provided with a slot matching the pump shaft (5), and the two ends of the pump shaft (5) being respectively inserted into the slots of the shaft frame (13) and the rear cover (2).

3. A close-connected permanent magnet direct-drive pump according to claim 2, characterized in that: The inner cavity of the front cover (1) is provided with a plurality of concave rings (14) which expand step by step.

4. A close-connected permanent magnet direct-drive pump according to claim 3, characterized in that: The pump also includes a thrust ring (8), the thrust ring (8) including a front thrust ring (81) and a rear thrust ring (82), the front thrust ring (81) being mounted on a concave ring (14) in the inner cavity of the front cover (1) near the liquid inlet (11) to control the vertical and horizontal accuracy of the excitation winding (71) and the magnetic capsule (4) to form a complete electromagnetic field, and the rear thrust ring (82) being sleeved on the pump shaft (5) and located at the connection between the magnetic capsule (4) and the rear cover (2).

5. A close-connected permanent magnet direct-drive pump according to claim 1, characterized in that: A locking sleeve (721) is provided below one end of the junction box (72) away from the excitation winding (71); an external power cable is inserted into the locking sleeve (721) and connected to the internal circuit of the junction box (72); a locking nut is provided at the rear end of the locking sleeve (721) to lock and fix the external power cable.

6. A close-connected permanent magnet direct-drive pump according to claim 2, characterized in that: Three guide plates (131) are extended from the shaft frame (13). The guide plates (131) are connected to the inner wall of the liquid inlet (11) and are symmetrically distributed with the slot of the shaft frame (13) as the center.

7. A close-connected permanent magnet direct-drive pump according to claim 4, characterized in that: A thrust washer (31) is provided at the front end of the impeller (3), and one end of the front thrust ring (81) close to the impeller (3) is coupled to the thrust washer (31).

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