Dynamic balance testing machine for permanent magnet rotor of gear pump

Abstract

The utility model discloses a dynamic balance testing machine for a permanent magnet rotor of a gear pump. The placement frame is arranged on the test bench, and the placement frame is configured to support a pump body of the gear pump and enable a permanent magnet rotor of the gear pump to be suspended on the placement frame; the output end of the rotary driving mechanism is provided with rotary magnetic columns, the rotary magnetic columns are close to the permanent magnet rotor and are coaxially arranged at intervals, and the rotary driving mechanism can drive the rotary magnetic columns to rotate around the axis of the rotary magnetic columns so as to drive the permanent magnet rotor to rotate around the axis of the rotary magnetic columns; and the displacement sensor is used for detecting the radial circle run-out of the permanent magnet rotor during rotation. The testing machine adopts a non-contact transmission structure, can achieve the purpose of testing the dynamic balance performance of the permanent magnet rotor, and is ingenious in design, convenient and rapid to mount and dismount the gear pump and high in testing efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of gear pump performance testing, in particular to a device for performing dynamic balance performance testing on a permanent magnet rotor on a gear pump. Background Art

[0002] A gear pump is a rotary pump that relies on the changes in working volume and movement between the pump cylinder and meshing gears to transport or increase pressure. The permanent magnet rotor in a gear pump is a precision rotating component used to connect the drive gears. The dynamic balance performance of the permanent magnet rotor is primarily determined by its radial runout.

[0003] Considering the machining accuracy of the permanent magnet rotor itself and the assembly accuracy on the gear pump, the radial circular runout error of the permanent magnet rotor may cause the permanent magnet rotor to generate a large dynamic unbalanced exciting force at high speed during operation, affecting the vibration of the permanent magnet rotor during rotation and the coordination between the magnetic fields generated by the permanent magnet rotor and the external magnetic rotor, greatly affecting the service life of the permanent magnet rotor and the working effect of the gear pump.

[0004] Currently, the equipment used to test the dynamic balance performance of the permanent magnet rotor on a gear pump is usually large, and the transmission structure that drives the permanent magnet rotor to rotate during the test is complex, making it inconvenient to quickly install and disassemble the gear pump, resulting in low overall test efficiency. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a gear pump permanent magnet rotor dynamic balancing tester to improve testing efficiency.

[0006] According to the gear pump permanent magnet rotor dynamic balancing tester of the embodiment of the present invention, it has front-to-back direction, left-to-right direction and up-down direction, including: a test bench; a placement frame, which is arranged on the test bench, and the placement frame is configured to support the pump body of the gear pump and make the permanent magnet rotor of the gear pump suspended on the placement frame, and the axial direction of the permanent magnet rotor extends along the front-to-back direction; a rotation drive mechanism, which is arranged on the test bench, and the output end of the rotation drive mechanism is equipped with a rotating magnetic column, the rotating magnetic column is close to the permanent magnet rotor and is coaxially spaced, and the rotation drive mechanism can drive the rotating magnetic column to rotate around its own axis to drive the permanent magnet rotor to follow the rotation around its own axis; a displacement sensor, which is arranged on the test bench and close to one side of the permanent magnet rotor in the left-right direction, and the displacement sensor is used to detect the radial circular runout of the permanent magnet rotor during rotation.

[0007] The invention has at least the following beneficial effects: the testing machine adopts a contactless transmission structure. Before the test, the pump body of the gear pump is supported by a placement frame, and the permanent magnet rotor of the gear pump is suspended on the placement frame. During the test, the rotary drive mechanism is turned on to rotate the rotating magnetic column around its own axis, generating an electromagnetic torque. The torque drives the permanent magnet rotor to rotate around its own axis through the air, and then the radial circular runout of the permanent magnet rotor during rotation is detected by a displacement sensor, thereby achieving the purpose of testing the dynamic balance performance of the permanent magnet rotor. The design is ingenious, the gear pump can be installed and disassembled quickly and conveniently, and the test efficiency is high.

[0008] According to some embodiments of the present invention, the cross-sectional diameter of the rotating magnetic column is consistent with the cross-sectional diameter of the permanent magnet rotor.

[0009] According to some embodiments of the present invention, the displacement sensor is a differential sensor, the probe of the differential sensor elastically contacts the outer peripheral surface of the permanent magnet rotor, and the test bench is provided with an auxiliary support wheel on the other side of the permanent magnet rotor opposite to the differential sensor, and the auxiliary support wheel elastically contacts the outer peripheral surface of the permanent magnet rotor.

[0010] According to some embodiments of the present invention, two groups of auxiliary support wheels are provided, and the two groups of auxiliary support wheels are distributed up and down. The contact points of the two groups of auxiliary support wheels, the probe of the differential sensor and the outer peripheral surface of the permanent magnet rotor constitute three points of an isosceles triangle, and the contact points of the probe of the differential sensor and the outer peripheral surface of the permanent magnet rotor are the vertices of the isosceles triangle.

[0011] According to some embodiments of the present invention, it also includes a mounting block and a push rod, the mounting block is arranged on the test bench, the mounting block is provided with a through hole and the push rod can slide through, the auxiliary support wheel is rotatably mounted on one end of the push rod, the push rod is provided with a spring action surface, a spring is provided between the mounting block and the spring action surface, the spring is sleeved outside the push rod and applies a force toward the permanent magnet rotor to the spring action surface and the auxiliary support wheel.

[0012] According to some embodiments of the present invention, a limit block is installed at the other end of the push rod, and the limit block is located at the other end of the perforation relative to the auxiliary support wheel. When the gear pump is not supported on the placement rack, the limit block can be stopped on the mounting block under the action of the spring.

[0013] According to some embodiments of the present invention, the displacement sensor is a laser displacement sensor, and a detection end of the laser displacement sensor faces the outer peripheral surface of the permanent magnet rotor.

[0014] According to some embodiments of the present invention, the placement rack has at least two groups of support assemblies arranged along the front-to-back direction, each group of the support assemblies includes a pair of support blocks spaced apart along the left-to-right direction, each pair of the support blocks has two upwardly inclined and oppositely arranged support slopes, and the two support slopes on each pair of the support blocks are suitable for jointly supporting the pump body of the gear pump.

[0015] According to some embodiments of the present invention, a friction pad is provided on the supporting inclined surface.

[0016] According to some embodiments of the present invention, the rotation drive mechanism is a motor.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is a schematic diagram of the structure of some embodiments of the present invention when supporting a gear pump;

[0020] Figure 2 This is a partial structural diagram of one embodiment of the present invention when supporting a gear pump;

[0021] Figure 3 This is a top view of a portion of the embodiments of the present invention when supporting a gear pump;

[0022] Figure 4 This is a schematic structural diagram of some embodiments of the present invention;

[0023] Figure 5 This is a schematic structural diagram of another embodiment of the present invention when supporting a gear pump.

[0024] Figure numbers: gear pump 100, pump body 110, permanent magnet rotor 120, test bench 1, placement rack 2, support block 21, support inclined surface 211, rotation drive mechanism 3, rotating magnetic column 4, displacement sensor 5, probe 51, auxiliary support wheel 6, mounting block 7, push rod 8, spring action surface 81, limit block 82, spring 9. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] Reference Figures 1 to 5 The utility model discloses a gear pump permanent magnet rotor dynamic balancing tester, which has front-to-back direction, left-right direction and up-down direction, and includes a test table 1, a placement frame 2, a rotation drive mechanism 3, a rotating magnetic column 4 and a displacement sensor 5.

[0029] Among them, reference Figure 1 and Figure 2 The placement rack 2 is set on the test bench 1, and the placement rack 2 is configured to support the pump body 110 of the gear pump 100 and make the permanent magnet rotor 120 of the gear pump 100 suspended on the placement rack 2, and the axial direction of the permanent magnet rotor 120 extends along the front-to-back direction.

[0030] It should be noted that the test object of this testing machine is the gear pump 100, but the gear pump 100 is not a completely assembled finished product, but a semi-finished product. After the permanent magnet rotor 120 is assembled, the gear pump 100 needs to be tested for its dynamic balancing performance in a timely manner. This semi-finished gear pump 100 mainly includes the pump body 110 and its internal components, and the permanent magnet rotor 120, but does not include a sealing cover for sealing the permanent magnet rotor 120. Therefore, the permanent magnet rotor 120 is directly exposed to the outside.

[0031] Reference Figures 1 to 3 The rotary drive mechanism 3 is arranged on the test bench 1. The output end of the rotary drive mechanism 3 is installed with a rotating magnetic column 4. The shape of the rotating magnetic column 4 is roughly cylindrical. The rotating magnetic column 4 is close to the permanent magnet rotor 120 and is coaxially spaced. The rotary drive mechanism 3 can drive the rotating magnetic column 4 to rotate around its own axis to drive the permanent magnet rotor 120 to rotate around its own axis.

[0032] It can be understood that the rotary drive mechanism 3 drives the rotating magnetic column 4 to rotate around its own axis, which can generate electromagnetic torque. This torque drives the permanent magnet rotor 120 to rotate around its own axis through the air.

[0033] Reference Figure 1 、 Figure 3 and Figure 5 Displacement sensor 5 is disposed on test bench 1 near one side of permanent magnet rotor 120 in the left-right direction. Displacement sensor 5 is used to detect radial runout of permanent magnet rotor 120 during rotation. Displacement sensor 5 can be a mechanical contact displacement sensor or a contactless displacement sensor.

[0034] This testing machine adopts a contactless transmission structure. Before the test, the pump body 110 of the gear pump 100 is supported by the placement frame 2, and the permanent magnet rotor 120 of the gear pump 100 is suspended on the placement frame 2. During the test, the rotation drive mechanism 3 is turned on to rotate the rotating magnetic column 4 around its own axis, generating an electromagnetic torque. This torque drives the permanent magnet rotor 120 to rotate around its own axis through the air. The radial circular runout of the permanent magnet rotor 120 during rotation is then detected by the displacement sensor 5.

[0035] Thus, the purpose of testing the dynamic balance performance of the permanent magnet rotor 120 is achieved. The design is ingenious, the gear pump 100 is conveniently and quickly installed and disassembled, and the testing efficiency is high.

[0036] In some embodiments of the present invention, referring to Figure 2 and Figure 3 The cross-sectional diameter of the rotating magnetic column 4 is consistent with the cross-sectional diameter of the permanent magnet rotor 120, which is conducive to the permanent magnet rotor 120 completely following the rotation of the rotating magnetic column 4 and reducing the influence of unbalanced force.

[0037] Reference Figures 2 to 4 In some embodiments of the present invention, the displacement sensor 5 is specifically a differential sensor, which is a mechanical contact displacement sensor and is a common differential sensor on the market.

[0038] Among them, the probe 51 of the differential sensor elastically contacts the outer circumference of the permanent magnet rotor 120. During testing, the probe 51 can elastically expand and contract following the outer circumference runout of the permanent magnet rotor 120 during rotation, thereby effectively detecting the radial circular runout of the permanent magnet rotor 120 during rotation.

[0039] In order to reduce the influence of the abutment pressure of the probe 51 on the permanent magnet rotor 120, the test bench 1 is provided with an auxiliary support wheel 6 on the other side of the permanent magnet rotor 120 relative to the differential sensor. The auxiliary support wheel 6 elastically contacts the outer peripheral surface of the permanent magnet rotor 120. By reasonably setting the pressure applied by the auxiliary support wheel 6 on the permanent magnet rotor 120, the pressure applied by the probe 51 on the permanent magnet rotor 120 can be offset from the opposite direction, thereby improving the test accuracy.

[0040] Specifically, the auxiliary support wheels 6 can be provided in a group, which are completely opposite to the probe 51. However, considering that the permanent magnet rotor 120 may be offset up and down, it cannot be guaranteed that the auxiliary support wheels 6 and the probe 51 are completely in the same horizontal plane. Therefore, in some embodiments, the auxiliary support wheels 6 can also be provided in two groups, and the two groups of auxiliary support wheels 6 are distributed up and down.

[0041] Reference Figure 2 and Figure 4 The contact points between the two sets of auxiliary support wheels 6, the differential sensor probe 51, and the outer circumference of the permanent magnet rotor 120 form the three points of an isosceles triangle, with the points of contact between the differential sensor probe 51 and the outer circumference of the permanent magnet rotor 120 serving as the vertices of the isosceles triangle. This ensures that the forces exerted on the outer circumference of the permanent magnet rotor 120 by the two sets of auxiliary support wheels 6 and the differential sensor probe 51 are largely balanced and relatively stable.

[0042] In some embodiments, reference Figures 2 to 4 The testing machine also includes a mounting block 7 and a push rod 8. The mounting block 7 is arranged on the test bench 1. The mounting block 7 is provided with a through hole for the push rod 8 to slide through. The auxiliary support wheel 6 is rotatably mounted on one end of the push rod 8. The push rod 8 is provided with a spring action surface 81. A spring 9 is provided between the mounting block 7 and the spring action surface 81. The spring 9 is sleeved on the outside of the push rod 8 and applies a force toward the permanent magnet rotor 120 to the spring action surface 81 and the auxiliary support wheel 6, so that the permanent magnet rotor 120 is always subjected to the pressure applied by the auxiliary support wheel 6.

[0043] Reference Figure 3 The other end of the push rod 8 is provided with a limit block 82, which is located at the other end of the perforation relative to the auxiliary support wheel 6. Figure 4 When the gear pump 100 is not supported on the placement rack 2, the limit block 82 can be stopped on the mounting block 7 under the action of the spring 9, preventing the auxiliary support wheel 6 from continuing to move toward the probe 51, making it convenient to place the permanent magnet rotor 120 between the auxiliary support wheel 6 and the probe 51 before testing.

[0044] Another embodiment of the present invention is shown in FIG. Figure 5The displacement sensor 5 is a laser displacement sensor, which is a contactless displacement sensor. The detection end of the laser displacement sensor faces the outer peripheral surface of the permanent magnet rotor 120 and can detect the radial circular runout of the permanent magnet rotor 120 during rotation.

[0045] In some embodiments, reference Figure 2 and Figure 4 The placement rack 2 has at least two groups of support assemblies arranged along the front-to-back direction, and each group of support assemblies includes a pair of support blocks 21 spaced apart along the left-right direction. Each pair of support blocks 21 has two upwardly inclined and oppositely arranged support slopes 211. The two support slopes 211 on each pair of support blocks 21 are suitable for jointly supporting the pump body 110 of the gear pump 100, making it convenient to place and remove the gear pump 100.

[0046] In addition, a friction pad may be provided on the supporting inclined surface 211 to increase the static friction between the supporting inclined surface 211 and the pump body 110 of the gear pump 100 , thereby preventing the pump body 110 from rotating.

[0047] The rotation drive mechanism 3 can be a motor or a rotary cylinder, both of which can achieve precise control of the rotation speed of the rotating magnetic column 4.

[0048] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. Gear pump permanent magnet rotor dynamic balancing test machine, characterized in that, It has front-to-back, left-to-right, and up-down directions, including: test bench; A placement frame is provided on the test bench, the placement frame being configured to support a pump body of the gear pump and to suspend a permanent magnet rotor of the gear pump on the placement frame, wherein the axial direction of the permanent magnet rotor extends in a front-to-back direction; A rotary drive mechanism is provided on the test bench, wherein a rotating magnetic column is installed at the output end of the rotary drive mechanism, and the rotating magnetic column is close to the permanent magnet rotor and is coaxially spaced. The rotary drive mechanism can drive the rotating magnetic column to rotate around its own axis, thereby driving the permanent magnet rotor to rotate around its own axis. A displacement sensor is provided on the test bench and close to one side of the permanent magnet rotor in the left and right directions, and is used to detect radial circular runout of the permanent magnet rotor during rotation.

2. The gear pump permanent magnet rotor dynamic balancing tester according to claim 1, characterized in that: The cross-sectional diameter of the rotating magnetic column is consistent with the cross-sectional diameter of the permanent magnet rotor.

3. The gear pump permanent magnet rotor dynamic balancing tester according to claim 1, characterized in that: The displacement sensor is a differential sensor, the probe of the differential sensor elastically contacts the outer circumferential surface of the permanent magnet rotor, and the test bench is provided with an auxiliary support wheel on the other side of the permanent magnet rotor opposite to the differential sensor, and the auxiliary support wheel elastically contacts the outer circumferential surface of the permanent magnet rotor.

4. The gear pump permanent magnet rotor dynamic balancing tester according to claim 3, characterized in that: Two groups of auxiliary support wheels are provided, and the two groups of auxiliary support wheels are distributed up and down. The contact points of the two groups of auxiliary support wheels, the probe of the differential sensor and the outer peripheral surface of the permanent magnet rotor constitute three points of an isosceles triangle, and the contact points of the probe of the differential sensor and the outer peripheral surface of the permanent magnet rotor are the vertices of the isosceles triangle.

5. The gear pump permanent magnet rotor dynamic balancing tester according to claim 3 or 4, characterized in that: It also includes a mounting block and a push rod, the mounting block is arranged on the test bench, the mounting block is provided with a through hole for the push rod to slide through, the auxiliary support wheel is rotatably mounted on one end of the push rod, the push rod is provided with a spring action surface, a spring is provided between the mounting block and the spring action surface, the spring is sleeved outside the push rod and applies a force toward the permanent magnet rotor to the spring action surface and the auxiliary support wheel.

6. The gear pump permanent magnet rotor dynamic balancing tester according to claim 5, characterized in that: A limit block is installed at the other end of the push rod, and the limit block is located at the other end of the through hole relative to the auxiliary support wheel. When the gear pump is not supported on the placement rack, the limit block can be stopped on the mounting block under the action of the spring.

7. The gear pump permanent magnet rotor dynamic balancing tester according to claim 1, characterized in that: The displacement sensor is a laser displacement sensor, and a detection end of the laser displacement sensor faces the outer peripheral surface of the permanent magnet rotor.

8. The gear pump permanent magnet rotor dynamic balancing tester according to claim 1, characterized in that: The placement rack is provided with at least two groups of support assemblies arranged along the front-to-back direction, and each group of support assemblies includes a pair of support blocks spaced apart along the left-to-right direction, and each pair of support blocks has two upwardly inclined and oppositely arranged support slopes, and the two support slopes on each pair of support blocks are suitable for jointly supporting the pump body of the gear pump.

9. The gear pump permanent magnet rotor dynamic balancing tester according to claim 8, characterized in that: A friction pad is provided on the supporting inclined surface.

10. The gear pump permanent magnet rotor dynamic balancing tester according to claim 1, characterized in that: The rotation drive mechanism is a motor.

Images