A pump assembly driven by a permanent magnet synchronous motor

Abstract

The utility model discloses a pump assembly of permanent magnet synchronous motor drive, including permanent magnet synchronous motor, pump body, oil cylinder body, intermediate body and swash plate, permanent magnet synchronous motor installs on oil cylinder body, and permanent magnet synchronous motor is equipped with output shaft, and swash plate is connected with output shaft, and pump body is installed with plunger, and plunger is in contact with swash plate, and swash plate rotation drive plunger makes linear reciprocating motion, and intermediate body is connected with oil cylinder body and pump body, and intermediate body is used for connecting oil cylinder body and pump body, and this structure installs permanent magnet synchronous motor on oil cylinder body directly, and utilizes output shaft to connect swash plate and drives plunger reciprocating motion, simultaneously through intermediate body and connects oil cylinder body and pump body, has realized the highly integrated design, has controlled the displacement and output flow of pump body through the rotating speed of permanent magnet synchronous motor, has saved part structure design, has simplified overall structure, has reduced the volume and weight of pump assembly, has reduced manufacturing cost, and has promoted the structure rigidity and power transmission efficiency of system.

Description

Technical Field

[0001] This utility model belongs to the field of plunger pump technology, and in particular relates to a pump assembly driven by a permanent magnet synchronous motor. Background Technology

[0002] Electric motor-driven pump systems, as the core power unit of hydraulic transmission and fluid machinery, are widely used in many industries and fields such as metallurgy, petrochemicals, chemicals, coal, building materials, public utilities, and aerospace. They are the most widely used general-purpose machinery in the national economy.

[0003] Chinese patents disclose an invention patent entitled "A Swashplate Axial Piston Pump Directly Driven by an Internal Rotor Permanent Magnet Synchronous Motor" (application publication number: CN110005586A). This patent allows for the adjustment of the variable mechanism knob when changing the displacement and output flow of the piston pump. By changing the relative position of the control slide valve and the variable piston, the swashplate is oscillated. When the angle of the swashplate changes, the displacement and output flow of the piston pump change accordingly, thereby achieving the purpose of flow regulation.

[0004] However, the above solution requires an additional adjustment mechanism to change the pump displacement and output flow rate, making the overall structure of the pump more complex and the overall volume larger. Therefore, it needs to be improved. Utility Model Content

[0005] The purpose of this invention is to solve the aforementioned technical problems in the prior art and provide a pump assembly driven by a permanent magnet synchronous motor. This structure achieves a high degree of integration by directly mounting the permanent magnet synchronous motor on the cylinder body and using the output shaft to connect the swashplate to drive the piston reciprocating motion. At the same time, the cylinder body and the pump body are connected by an intermediate body. The pump body's displacement and output flow rate are controlled by controlling the speed of the permanent magnet synchronous motor, effectively eliminating some structural design, significantly simplifying the overall structure, greatly reducing the volume and weight of the pump assembly, reducing manufacturing costs, and improving the system's structural rigidity and power transmission efficiency.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A pump assembly driven by a permanent magnet synchronous motor includes a permanent magnet synchronous motor and a pump body. The permanent magnet synchronous motor drives the pump body to move. The assembly is characterized by further including a cylinder body, an intermediate body, and a swashplate. The permanent magnet synchronous motor is mounted on the cylinder body and has an output shaft. The swashplate is connected to the output shaft. A plunger is mounted on the pump body and abuts against the swashplate. Rotation of the swashplate drives the plunger to perform linear reciprocating motion. The intermediate body connects the cylinder body and the pump body. This structure achieves a highly integrated design by directly mounting the permanent magnet synchronous motor on the cylinder body and using the output shaft to connect the swashplate and drive the plunger to reciprocate motion. Simultaneously, the intermediate body connects the cylinder body and the pump body. By controlling the rotational speed of the permanent magnet synchronous motor to control the pump body's displacement and output flow rate, it effectively eliminates some structural design elements, significantly simplifies the overall structure, greatly reduces the volume and weight of the pump assembly, lowers manufacturing costs, and improves the system's structural rigidity and power transmission efficiency.

[0008] Furthermore, the cylinder body is equipped with a bushing, on which the permanent magnet synchronous motor is mounted. The bushing has a through hole, and first bearings are installed at both ends of the through hole. The output shaft passes through the first bearings and is installed in the through hole. The cylinder body eliminates the traditional bulky independent support, allowing the output shaft of the permanent magnet synchronous motor to be directly supported in the bushing of the cylinder body through the bearings, which significantly improves the rigidity and stability of the permanent magnet synchronous motor installation.

[0009] Furthermore, the two ends of the through hole are provided with first limiting steps, and the first bearing is installed in the first limiting steps. The first limiting steps are used to limit the first bearing. The design of the first limiting steps provides the first bearing with precise axial positioning and reliable support surface, simplifies the installation process of the first bearing, prevents the first bearing from axially moving during operation, ensures the stability of the working position of the first bearing, and thus improves the accuracy and durability of the entire transmission system.

[0010] Furthermore, the cylinder body is provided with a mounting cavity for connecting the swashplate and the output shaft. The mounting cavity integrated into the cylinder body provides a compact and stable mounting space for the swashplate, enabling the swashplate to be directly and efficiently connected to the output shaft, simplifying the power transmission path, reducing energy loss in intermediate links, and optimizing the spatial layout of the overall structure.

[0011] Furthermore, the output shaft and swashplate are provided with corresponding fixing holes. The output shaft and swashplate are fixedly connected by bolts through the fixing holes. A shim is provided between the bolt and the swashplate. The bolt fastening connection method is simple and reliable, and is easy to manufacture, assemble and maintain. The shim can accurately adjust the axial clearance or preload between the swashplate and the output shaft, compensate for machining errors, and also avoid wear of the swashplate by the bolts.

[0012] Furthermore, the swashplate is equipped with a second bearing. One side of the second bearing abuts against the swashplate, and the other side abuts against the plunger. Through the design of the second bearing, the rotational motion of the swashplate is converted into the huge axial force generated by the linear motion of the plunger. This force is borne by the second bearing instead of the swashplate and the plunger directly rubbing against each other, which greatly reduces friction loss and temperature rise, improves transmission efficiency and lifespan, and makes the operation smoother and more stable.

[0013] Furthermore, a connecting part is provided on one side of the cylinder body, which is connected to the intermediate body. Both the connecting part and the intermediate body are provided with a first threaded hole. The connecting part and the intermediate body are detachably connected by bolts through the first threaded holes. The detachable design of the bolt connection makes the connection between the cylinder body and the intermediate body very strong and reliable. At the same time, it greatly facilitates subsequent maintenance, repair or component replacement without the need for overall disassembly, which significantly reduces maintenance costs and downtime.

[0014] Furthermore, the intermediate body is provided with a plunger mounting hole through which the plunger passes. The plunger mounting hole and the pump body are respectively provided with a second limiting step. The two second limiting steps form a limiting groove, which is used to limit the plunger. The plunger mounting hole provides a precise guiding channel for the pump body plunger, ensuring that the plunger maintains a stable linear trajectory during reciprocating motion, reducing uneven wear and leakage, and improving the volumetric efficiency and long-term working stability of the pump. The limiting groove formed by the intermediate body and the pump body provides precise axial positioning constraint for the plunger, preventing unnecessary axial movement of the plunger during the working stroke, and ensuring the straightness and stability of the plunger's reciprocating motion in the pump body.

[0015] Furthermore, the intermediate body and the pump body are respectively provided with second threaded holes. The intermediate body and the pump body are detachably connected by bolts through the second threaded holes. The detachable connection between the intermediate body and the pump body by bolts not only ensures the strength and rigidity of the connection and can withstand the hydraulic pressure and mechanical force when the pump is working, but also realizes the modular design, which facilitates the assembly, disassembly and independent replacement of the pump body or intermediate body module.

[0016] Furthermore, the pump body is connected to an inlet connector and an outlet connector. The inlet and outlet connectors integrated on the pump body provide standardized fluid interfaces, which facilitates quick and easy connection to external piping systems, reduces additional connectors and potential leakage points, optimizes system integration, and makes the installation and deployment of the pump assembly simpler and faster.

[0017] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0018] 1. This utility model achieves a highly integrated design by directly mounting a permanent magnet synchronous motor on the cylinder body and using the output shaft to connect a swashplate to drive the piston reciprocating motion. At the same time, the cylinder body and the pump body are connected by an intermediate body, thereby achieving a highly integrated design. The pump body's displacement and output flow rate are controlled by controlling the speed of the permanent magnet synchronous motor, effectively eliminating some structural design, significantly simplifying the overall structure, greatly reducing the volume and weight of the pump assembly, reducing manufacturing costs, and improving the system's structural rigidity and power transmission efficiency.

[0019] 2. The cylinder body is equipped with a bushing, and the permanent magnet synchronous motor is mounted on the bushing. The bushing has a through hole, and the two ends of the through hole are equipped with first bearings. The output shaft passes through the first bearings and is installed in the through hole. The cylinder body eliminates the traditional bulky independent bracket, so that the output shaft of the permanent magnet synchronous motor is directly supported in the bushing of the cylinder body through the bearings, which significantly improves the rigidity and stability of the permanent magnet synchronous motor installation.

[0020] 3. The swashplate is equipped with a second bearing. One side of the second bearing abuts against the swashplate, and the other side abuts against the plunger. Through the design of the second bearing, the rotational motion of the swashplate is converted into the huge axial force generated by the linear motion of the plunger. The second bearing bears the force instead of the swashplate and the plunger directly rubbing against each other, which greatly reduces friction loss and temperature rise, improves transmission efficiency and life, and makes the operation smoother and more stable. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a pump assembly driven by a permanent magnet synchronous motor according to the present invention;

[0023] Figure 2 This utility model Figure 1 A sectional view;

[0024] Figure 3 This is a schematic diagram of the structure of the cylinder body and intermediate body in this utility model;

[0025] Figure 4 This utility model Figure 3 A sectional view;

[0026] Figure 5 This is a schematic diagram of the structure of the oil cylinder body in this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the intermediate of this utility model;

[0028] Figure 7 This is a schematic diagram of the output shaft, swashplate, and second bearing in this utility model;

[0029] Figure 8This is a cross-sectional view of the intermediate body and pump body of this utility model.

[0030] In the diagram: 1-Permanent magnet synchronous motor; 2-Cylinder body; 3-Intermediate body; 4-Swashplate; 5-Pump body; 6-Output shaft; 7-Plunger; 8-Busset; 9-Through hole; 10-First bearing; 11-First limiting step; 12-Mounting cavity; 13-Fixing hole; 14-Gasket; 15-Second bearing; 16-Connecting part; 17-First threaded hole; 18-Plunger mounting hole; 19-Second limiting step; 20-Limiting groove; 21-Second threaded hole; 22-Water inlet connector; 23-Water outlet connector; 24-Bolt. Detailed Implementation

[0031] like Figures 1 to 8 As shown, this utility model discloses a pump assembly driven by a permanent magnet synchronous motor 1, including a permanent magnet synchronous motor 1, a pump body 5, a cylinder body 2, an intermediate body 3, and a swashplate 4. The permanent magnet synchronous motor 1 is mounted on the cylinder body 2 and has an output shaft 6. The swashplate 4 is connected to the output shaft 6. A plunger 7 is mounted on the pump body 5, and the plunger 7 abuts against the swashplate 4. The rotation of the swashplate 4 drives the plunger 7 to perform linear reciprocating motion. The intermediate body 3 connects the cylinder body 2 and the pump body 5, and serves to connect the cylinder body 2 and the pump body 5. The structure achieves a high degree of integration by directly mounting the permanent magnet synchronous motor 1 on the cylinder body 2 and using the output shaft 6 to connect the swashplate 4 to drive the piston 7 to reciprocate. At the same time, the cylinder body 2 and the pump body 5 are connected by the intermediate body 3. The displacement and output flow of the pump body 5 are controlled by controlling the speed of the permanent magnet synchronous motor 1, which effectively eliminates some structural design, significantly simplifies the overall structure, greatly reduces the volume and weight of the pump assembly, reduces manufacturing costs, and improves the structural rigidity and power transmission efficiency of the system.

[0032] The cylinder body 2 is equipped with a bushing 8, on which the permanent magnet synchronous motor 1 is mounted. The bushing 8 has a through hole 9, and first limiting steps 11 are provided at both ends of the through hole 9. The first bearing 10 is installed in the first limiting steps 11 at both ends of the through hole 9. The output shaft 6 passes through the first bearing 10 and is installed in the through hole 9. The outer wall of the first bearing 10 abuts against the through hole 9, and the inner wall of the first bearing 10 is sleeved on the output shaft 6. The cylinder body 2 eliminates the traditional bulky independent bracket, allowing the output shaft 6 of the permanent magnet synchronous motor 1 to be directly supported in the bushing 8 of the cylinder body 2 through the bearing. This significantly improves the rigidity and stability of the permanent magnet synchronous motor 1 installation. The first limiting steps 11 are used to limit the first bearing 10. The design of the first limiting steps 11 provides the first bearing 10 with precise axial positioning and reliable support surface, simplifies the installation process of the first bearing 10, prevents the first bearing 10 from axially moving during operation, ensures the stability of the working position of the first bearing 10, and thus improves the accuracy and durability of the entire transmission system.

[0033] The cylinder body 2 is provided with a mounting cavity 12, which is connected to the through hole 9. The mounting cavity 12 is used to connect the swashplate 4 and the output shaft 6. The output shaft 6 and the swashplate 4 are respectively provided with fixing holes 13. The output shaft 6 and the swashplate 4 are fixedly connected by bolts 24 through the fixing holes 13. The mounting cavity 12 integrated into the cylinder body 2 provides a compact and stable mounting space for the swashplate 4, enabling the swashplate 4 to be directly and efficiently connected to the output shaft 6. This simplifies the power transmission path, reduces energy loss in intermediate links, and optimizes the spatial layout of the overall structure. The connection method of fastening with bolts 24 is simple and reliable, and is easy to manufacture, assemble, and maintain.

[0034] A shim 14 is provided between the bolt 24 and the swash plate 4. The shim 14 can precisely adjust the axial clearance or preload between the swash plate 4 and the output shaft 6, compensate for machining errors, and also prevent the bolt 24 from wearing the swash plate 4.

[0035] The swash plate 4 is equipped with a second bearing 15. One side of the second bearing 15 abuts against the swash plate 4, and the other side abuts against the plunger 7. Through the design of the second bearing 15, the rotational motion of the swash plate 4 is converted into the huge axial force generated by the linear motion of the plunger 7. The second bearing 15 bears the force instead of the direct hard friction between the swash plate 4 and the plunger 7, which greatly reduces friction loss and temperature rise, improves transmission efficiency and life, and makes the operation smoother and more stable.

[0036] A connecting part 16 is provided on one side of the cylinder body 2. The connecting part 16 is connected to the intermediate body 3. Both the connecting part 16 and the intermediate body 3 are provided with a first threaded hole 17. The connecting part 16 and the intermediate body 3 are detachably connected by bolts 24 through the first threaded hole 17. The detachable design of the bolt 24 connection makes the connection between the cylinder body 2 and the intermediate body 3 very strong and reliable. At the same time, it greatly facilitates subsequent maintenance, repair or component replacement without the need for overall disassembly, which significantly reduces maintenance costs and downtime.

[0037] The intermediate body 3 is provided with a plunger mounting hole 18, through which the plunger 7 passes. The plunger mounting hole 18 and the pump body 5 are respectively provided with a second limiting step 19. The two second limiting steps 19 form a limiting groove 20, which is used to limit the plunger 7. The plunger mounting hole 18 provides a precise guide channel for the plunger 7 in the pump body 5, ensuring that the plunger 7 maintains a stable straight trajectory during reciprocating motion, reducing uneven wear and leakage, and improving the volumetric efficiency and long-term working stability of the pump. The limiting groove 20 formed by the intermediate body 3 and the pump body 5 provides a precise axial positioning constraint for the plunger 7, preventing unnecessary axial movement of the plunger 7 during the working stroke, and ensuring the straightness and stability of the plunger 7 in the reciprocating motion within the pump body 5.

[0038] The intermediate body 3 and the pump body 5 are respectively provided with second threaded holes 21. The intermediate body 3 and the pump body 5 are detachably connected by bolts 24 through the second threaded holes 21. The detachable connection between the intermediate body 3 and the pump body 5 by the bolts 24 not only ensures the strength and rigidity of the connection and can withstand the hydraulic pressure and mechanical force when the pump is working, but also realizes the modular design, which facilitates the assembly, disassembly and independent replacement of the pump body 5 or intermediate body 3 module.

[0039] The pump body 5 is connected to an inlet connector 22 and an outlet connector 23. The inlet connector 22 and the outlet connector 23 integrated on the pump body 5 provide standardized fluid interfaces, which facilitates quick connection to external pipeline systems, reduces additional connectors and possible leakage points, optimizes the integration of the system, and makes the installation and deployment of the pump assembly simpler and faster.

[0040] In this invention, the power supply for the permanent magnet synchronous motor is provided by a variable frequency drive. When starting, the output frequency of the variable frequency drive rises continuously from 0 to the operating frequency, and the motor speed rises synchronously with the output frequency of the variable frequency drive. The speed of the permanent magnet synchronous motor 1 is controlled by changing the output frequency of the variable frequency drive. The rotation speed of the swashplate 4 is controlled by the speed of the permanent magnet synchronous motor 1. The rotation of the swashplate 4 drives the plunger 7 to make linear reciprocating motion. The movement of the plunger 7 creates pressure in the cavity between the intermediate body 3 and the pump body 5. The speed of water flow is controlled by the rotation speed of the swashplate 4.

[0041] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A pump assembly driven by a permanent magnet synchronous motor, comprising a permanent magnet synchronous motor and a pump body, wherein the permanent magnet synchronous motor drives the pump body to move; Its features are: It also includes a cylinder body, an intermediate body, and a swashplate. The permanent magnet synchronous motor is mounted on the cylinder body and has an output shaft. The swashplate is connected to the output shaft. The pump body is equipped with a plunger that abuts against the swashplate. The rotation of the swashplate drives the plunger to perform linear reciprocating motion. The intermediate body is connected to the cylinder body and the pump body and is used to connect the cylinder body and the pump body.

2. The pump assembly driven by a permanent magnet synchronous motor according to claim 1, characterized in that: The cylinder body is provided with a bushing, the permanent magnet synchronous motor is mounted on the bushing, the bushing is provided with a through hole, and first bearings are installed at both ends of the through hole. The output shaft passes through the first bearings and is installed in the through hole.

3. The pump assembly driven by a permanent magnet synchronous motor according to claim 2, characterized in that: The two ends of the through hole are provided with first limiting steps, and the first bearing is installed in the first limiting steps. The first limiting steps are used to limit the first bearing.

4. The pump assembly driven by a permanent magnet synchronous motor according to claim 1, characterized in that: The cylinder body is provided with a mounting cavity, which is used to connect the swashplate and the output shaft.

5. A pump assembly driven by a permanent magnet synchronous motor according to claim 1, characterized in that: The output shaft and the swash plate are provided with fixing holes corresponding to each other. The output shaft and the swash plate are fixedly connected by bolts through the fixing holes. A washer is provided between the bolt and the swash plate.

6. The pump assembly driven by a permanent magnet synchronous motor according to claim 1, characterized in that: The swash plate is equipped with a second bearing, one side of which abuts against the swash plate and the other side of which abuts against the plunger.

7. A pump assembly driven by a permanent magnet synchronous motor according to claim 1, characterized in that: The cylinder body has a connecting part on one side, which is connected to the intermediate body. Both the connecting part and the intermediate body have a first threaded hole, and the connecting part and the intermediate body are detachably connected by bolts through the first threaded hole.

8. A pump assembly driven by a permanent magnet synchronous motor according to claim 1, characterized in that: The intermediate body is provided with a plunger mounting hole, through which the plunger passes. The plunger mounting hole and the pump body are provided with a second limiting step, and the two second limiting steps form a limiting groove, which is used to limit the plunger.

9. A pump assembly driven by a permanent magnet synchronous motor according to claim 1, characterized in that: The intermediate body and the pump body are respectively provided with second threaded holes, and the intermediate body and the pump body are detachably connected by bolts through the second threaded holes.

10. A pump assembly driven by a permanent magnet synchronous motor according to claim 1, characterized in that: The pump body is connected to an inlet connector and an outlet connector.

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