A test bench for testing the driving performance of an axial flow blood pump coil

Abstract

This utility model belongs to the field of medical devices, and in particular, it is a test bench for testing the driving performance of axial flow blood pump coils. It includes a base, a brake bracket fixedly mounted on a rear sliding frame, a hysteresis brake fixedly connected to the brake bracket, a coil at the driven magnet, and a coil fixing cylinder fixedly connected to the coil. During testing, the resistance applied to the driven magnet shaft by the hysteresis brake is adjusted to simulate the load resistance experienced by the blood pump rotor blades during actual use. Each positioning rod is fixedly connected to three clamping rods arranged in a circumferential array. By turning the inner ring screw, the self-centering inner ring rotates, which in turn rotates the positioning rods. The clamping rods hold the coil fixing cylinder, facilitating the positioning of the coil and ensuring that the axis of the coil and the driven magnet are aligned. This ensures the stability and accuracy of the test. Data testing can be performed without installation in the blood pump hydraulic performance testing pipeline system, shortening the testing cycle, avoiding repeated disassembly and assembly, and ensuring the independence and reliability of the test data.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically a test bench for testing the driving performance of axial flow blood pump coils. Background Technology

[0002] Currently, the testing of axial flow blood pump coil drive performance typically relies on blood pump fluid performance testing. This involves fabricating a complete blood pump assembly based on the core and coil parameters determined during the design process, assembling the pump, and then connecting the complete pump to a fluid performance testing system. The blood pump flow rate is adjusted by controlling the pump speed, and the pump load is controlled by adjusting the pressures before and after the pump. The coil drive performance is evaluated based on the achievable speed, pressure, and flow rate. The drawback of this method is that blood pump design is an iterative process. From the initial design to the final design, the core and coil parameters need repeated adjustments. Furthermore, to complete the coil drive performance testing for each design version, corresponding blood pump components must be provided and the entire assembly process completed before connecting to the fluid performance testing system. This entire process requires significant time and manpower.

[0003] To address the aforementioned issues, there is an urgent need for a dedicated test bench that can directly test the driving performance of axial flow blood pump coils. This bench should be able to simulate the operating conditions of a blood pump and test the driving performance of the coils without requiring a complete blood pump assembly. Such a device needs to have rapid connection, controllable loading, and real-time monitoring capabilities to shorten the testing cycle, avoid repeated disassembly and assembly, and ensure the independence and reliability of the test data. However, the market currently lacks standardized solutions for this need, and existing test benches mostly focus on testing the overall performance of the blood pump, making it difficult to adapt to the independent testing scenarios of the coils. Therefore, developing a test bench specifically for testing the driving performance of axial flow blood pump coils has significant practical value. Utility Model Content

[0004] The purpose of this invention is to provide a test bench for testing the driving performance of axial flow blood pump coils, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a test bench for testing the driving performance of an axial flow blood pump coil, comprising a base, a slide rail fixedly connected to the upper end face of the base, three sliding frames slidably connected to the upper end face of the slide rail, the sliding frames being fixed and limited by locking screws, a bearing fixing seat fixedly mounted on the front sliding frame, a brake bracket fixedly mounted on the rear sliding frame, a hysteresis brake fixedly connected to the brake bracket, a brake shaft rotatably connected to the hysteresis brake, and a driven magnet shaft provided between the hysteresis brake and the bearing fixing seat. The driven magnet shaft is rotatably connected to the bearing mounting seat and fixedly connected to the brake shaft of the hysteresis brake via a coupling. The driven magnet shaft is fixedly connected to a driven magnet located between the brake bracket and the bearing mounting seat. The driven magnet is used to simulate the blood pump core. The driven magnet is provided with a coil and a coil fixing cylinder fixedly connected to the coil. The coil fixing cylinder is made of silicon steel. Thus, during testing, the resistance applied by the hysteresis brake to the driven magnet shaft can be adjusted to simulate the resistance experienced by the blood pump core and impeller during actual use, allowing for more accurate testing.

[0006] The sliding frame in the middle is fixedly mounted with a self-centering fixing plate. A self-centering outer ring is fixedly connected to the front end of the self-centering fixing plate. A self-centering inner ring is rotatably connected to the self-centering outer ring. An inner ring screw passing through the self-centering outer ring is fixedly connected to the self-centering inner ring, and three circumferentially arranged positioning rods are rotatably connected to the inner ring. Each positioning rod is rotatably connected to a limit rod, which is inserted into a limit groove of the self-centering outer ring. Each positioning rod is fixedly connected to three circumferentially arranged clamping rods. Therefore, by turning the inner ring screw, the self-centering inner ring can be rotated. The positioning rod can be rotated, and the clamping rod can hold the coil fixing cylinder to conveniently position the coil, thereby ensuring that the axis of the coil and the driven magnet are aligned, ensuring the stability and accuracy of the test. In this way, the coil can drive the driven magnet, and the driving performance of the coil on the driven magnet under different load conditions can be tested. The whole process does not require assembling a complete blood pump, nor does it require connection to a blood pump fluid performance testing system to test the data, shortening the testing cycle, avoiding repeated disassembly and assembly, and ensuring the independence and reliability of the test data.

[0007] Advantageously, both the self-centering fixing plate and the bearing fixing seat are fixedly connected to a bearing seat baffle, the bearing seat baffle is fixedly connected to a bearing seat, a bearing is installed in the bearing seat, and the bearings are rotatably connected to the driven magnet shaft. Thus, both the self-centering fixing plate and the bearing fixing seat are rotatably connected to the driven magnet shaft through the bearings, reducing the resistance to the rotation of the driven magnet shaft.

[0008] Advantageously, a control board is fixedly connected to the upper surface of the base, and a connecting wire is connected between the control board and the coil. The control board is equipped with a display and multiple control buttons. The rotational speed of the driven magnet and the start and stop are controlled by the control buttons, and the load applied to the shaft of the driven magnet is controlled by adjusting the power supply voltage of the hysteresis brake. The display shows the rotational speed and power in real time. The performance of the coil under different loads is evaluated by test data and displayed on the display.

[0009] Advantageously, the control board is connected to a power cord for connecting to a power source.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This invention features a self-centering inner ring, a positioning rod, and a clamping rod. By pushing the inner ring screw downwards, the positioning rod and clamping rod rotate, thereby clamping the coil fixing cylinder, limiting the coil's position, and ensuring that the coil's axis aligns with the driven magnet's axis, thus guaranteeing the stability and accuracy of the detection. The position of the clamping rod can be easily adjusted by moving the corresponding sliding frame.

[0012] This invention incorporates a coupling, a hysteresis brake, and a driven magnet shaft. The driven magnet shaft is rotatably connected to a bearing mounting base and a self-centering mounting plate via bearings, bearing seats, and bearing seat baffles. It is also rotatably connected to the hysteresis brake via the coupling, which applies resistance to the rotation of the driven magnet shaft to simulate the environment of real-world use. The input parameters applied to the coil are adjusted via a control board, which in turn drives the driven magnet shaft to rotate. This allows for data testing without installation in the blood pump hydraulic performance testing pipeline system, shortening the testing cycle, avoiding repeated disassembly and assembly, and ensuring the independence and reliability of the test data. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0014] Figure 2 for Figure 1 Top view;

[0015] Figure 3 for Figure 2 A schematic diagram of the AA cross-section;

[0016] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0017] Figure 5 This is a three-dimensional schematic diagram of the clamping rod of this utility model;

[0018] Figure 6 This is a three-dimensional schematic diagram showing the disassembly of the driven magnet shaft of this utility model.

[0019] In the diagram: 100, base; 101, slide rail; 102, sliding frame; 103, brake bracket; 104, hysteresis brake; 105, self-centering fixing plate; 106, self-centering outer ring; 107, bearing fixing seat; 108, control board; 109, display; 110, control button; 111, power cord; 112, coupling; 113, inner ring screw; 114, coil fixing cylinder; 115, coil; 116, connecting wire; 117, driven magnet shaft; 118, brake shaft; 119; 120, driven magnet; 121, bearing seat baffle; 122, bearing seat; 123, bearing; 124, positioning rod; 125, clamping rod; 126, self-centering inner ring; 127, limit rod; 128, limit groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1:

[0022] Please see Figure 1-6This utility model provides a technical solution: a test bench for testing the driving performance of an axial flow blood pump coil, including a base 100. A slide rail 101 is fixedly connected to the upper end face of the base 100. Three sliding frames 102 are slidably connected to the upper end face of the slide rail 101. The sliding frames 102 are fixed and limited by locking screws. A bearing fixing seat 107 is fixedly installed on the front sliding frame 102, and a brake bracket 103 is fixedly installed on the rear sliding frame 102. A hysteresis brake 104 is fixedly connected to the brake bracket 103. The hysteresis brake 104 is rotatably connected to a brake shaft 118. A driven magnet shaft 117 is provided between the bearing mounting base 107 and the bearing fixing base 107. The driven magnet shaft 117 is rotatably connected to the bearing fixing base 107. The driven magnet shaft 117 is fixedly connected to the brake shaft 118 of the hysteresis brake 104 via a coupling 112. A driven magnet 120 is fixedly connected to the driven magnet shaft 117, located between the brake bracket 103 and the bearing fixing base 107. The driven magnet 120 is used to simulate the blood pump core. A coil 115 and a coil fixing cylinder 114 fixedly connected to the coil 115 are provided at the driven magnet 120. The coil fixing cylinder 114 is made of silicon steel. During testing, the resistance applied by the hysteresis brake 104 to the driven magnet shaft 117 is adjusted to simulate the resistance experienced by the blood pump core and impeller during actual use, allowing for more accurate testing.

[0023] The sliding frame 102 in the middle is fixedly mounted with a self-centering fixing plate 105. A self-centering outer ring 106 is fixedly connected to the front end face of the self-centering fixing plate 105. A self-centering inner ring 126 is rotatably connected to the self-centering outer ring 106. An inner ring screw 113 passing through the self-centering outer ring 106 is fixedly connected to the self-centering inner ring 126. Three positioning rods 124 arranged in a circumferential array are rotatably connected to the self-centering inner ring 126. Each positioning rod 124 is rotatably connected to a limiting rod 127. The limiting rod 127 is inserted into the limiting groove 128 of the self-centering outer ring 106. Each positioning rod 124 is fixedly connected to three clamping rods 125 arranged in a circumferential array. Thus, by moving the inner ring... The screw 113 drives the self-centering inner ring 126 to rotate, which in turn drives the positioning rod 124 to rotate. The clamping rod 125 clamps the coil fixing cylinder 114, facilitating the positioning of the coil 115. This ensures that the coil 115 and the driven magnet 120 are aligned, guaranteeing the stability and accuracy of the test. In this way, the coil can drive the driven magnet, enabling the testing of the coil's driving performance under different load conditions. The entire process does not require assembling a complete blood pump or connecting it to a blood pump fluid performance testing system, shortening the testing cycle, avoiding repeated disassembly and assembly, and ensuring the independence and reliability of the test data.

[0024] The self-centering fixing plate 105 and the bearing fixing seat 107 are both fixedly connected to the bearing seat baffle 121. The bearing seat baffle 121 is fixedly connected to the bearing seat 122. The bearing seat 122 is equipped with a bearing 123. The bearings 123 are rotatably connected to the driven magnet shaft 117. Thus, the self-centering fixing plate 105 and the bearing fixing seat 107 are rotatably connected to the driven magnet shaft 117 through the bearings 123, thereby reducing the resistance to the rotation of the driven magnet shaft 117.

[0025] A control board 108 is fixedly connected to the upper surface of the base 100. A connecting line 116 connects the control board 108 and the coil 115. The control board 108 is equipped with a display 109 and multiple control buttons 110. The rotational speed of the driven magnet 120 and its start / stop are adjusted by the control buttons 110. The load applied to the driven magnet shaft is controlled by adjusting the power supply voltage of the hysteresis brake. The display 109 displays the rotational speed and power in real time. The performance of the coil 115 under different loads is evaluated by test data and displayed on the display 109.

[0026] The control board 108 is connected to a power cord 111, which is used to connect to a power source.

[0027] Working principle:

[0028] First, adjust the positions of the three sliding frames 102 and fix them with locking screws. Then, fix the self-centering fixing plate 105, bearing fixing seat 107 and brake bracket 103 on the sliding frame 102. The driven magnet shaft 117 is rotatably connected to the self-centering fixing plate 105 and bearing fixing seat 107 through the bearing seat baffle 121, bearing seat 122 and bearing 123, and is fixedly connected to the hysteresis brake 104 with the coupling 112. At the same time, turn the inner ring screw 113 to rotate the positioning rod 124 to drive the clamping rod 125 to clamp the coil fixing cylinder 114 and clamp the coil 115 to limit its position. This facilitates quick replacement of the test coil 115 and improves the efficiency of the test.

[0029] Then, by adjusting the power supply voltage of the hysteresis brake, the load applied to the driven magnet shaft is controlled to measure the resistance encountered during actual operation. After starting, when AC power is supplied to the coil 115, the driven magnet 120 rotates, driving the driven magnet shaft 117 to rotate for testing. During the test, the performance data such as the rotation speed of the driven magnet 120 and the power consumed by the coil 115 are displayed and recorded on the display 109 of the control board 108. By judging whether the performance of the coil 115 is qualified by the rotation speed of the driven magnet 120 and the power consumed by the coil 115 under a given load, the data can be tested without installing it into the blood pump hydraulic performance testing pipeline system, shortening the testing cycle, avoiding repeated disassembly and assembly, and ensuring the independence and reliability of the test data.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test bench for testing the driving performance of axial flow blood pump coils, comprising a base (100), characterized in that: A slide rail (101) is fixedly connected to the upper end face of the base (100). Three sliding brackets (102) are slidably connected to the upper end face of the slide rail (101). The sliding brackets (102) are fixed and limited by locking screws. A bearing fixing seat (107) is fixedly installed on the front sliding bracket (102), and a brake bracket (103) is fixedly installed on the rear sliding bracket (102). A hysteresis brake (104) is fixedly connected to the brake bracket (103). A brake shaft (118) is rotatably connected to the hysteresis brake (104). A driven magnet is provided between the hysteresis brake (104) and the bearing fixing seat (107). An iron shaft (117) is rotatably connected to the bearing mounting seat (107). The driven magnet shaft (117) is fixedly connected to the brake shaft (118) of the hysteresis brake (104) via a coupling (112). A driven magnet (120) is fixedly connected to the driven magnet shaft (117) between the brake bracket (103) and the bearing mounting seat (107). The driven magnet is used to simulate the blood pump core. A coil (115) and a coil fixing cylinder (114) fixedly connected to the coil (115) are provided at the driven magnet (120). The coil fixing cylinder is made of silicon steel. The sliding frame (102) in the middle is fixedly mounted with a self-centering fixing plate (105). The front end face of the self-centering fixing plate (105) is fixedly connected to a self-centering outer ring (106). The self-centering outer ring (106) is rotatably connected to a self-centering inner ring (126). The self-centering inner ring (126) is fixedly connected to an inner ring screw (113) that passes through the self-centering outer ring (106). The self-centering inner ring (126) is rotatably connected to three positioning rods (124) arranged in a circumferential array. Each positioning rod (124) is rotatably connected to a limit rod (127). The limit rod (127) is inserted into the limit groove (128) of the self-centering outer ring (106). Each positioning rod (124) is fixedly connected to three clamping rods (125) arranged in a circumferential array.

2. The test bench for testing the driving performance of axial flow blood pump coils according to claim 1, characterized in that: The self-centering fixing plate (105) and the bearing fixing seat (107) are both fixedly connected to the bearing seat baffle (121), the bearing seat baffle (121) is fixedly connected to the bearing seat (122), the bearing seat (122) is installed with a bearing (123), and the bearing (123) is rotatably connected to the driven magnet shaft (117).

3. The test bench for testing the driving performance of axial flow blood pump coils according to claim 2, characterized in that: A control board (108) is fixedly connected to the upper surface of the base (100). A connecting line (116) is connected between the control board (108) and the coil (115). The control board (108) is provided with a display (109) and multiple control buttons (110). The rotation speed of the driven magnet (120) and the start and stop are controlled by the control buttons (110). The load applied to the driven magnet shaft (117) is controlled by adjusting the power supply voltage of the hysteresis brake (104).

4. The test bench for testing the driving performance of axial flow blood pump coils according to claim 3, characterized in that: The control board (108) is connected to a power cord (111).

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