阅读说明：本技术 一种用于测量血泵螺旋槽动压液膜轴向刚度的平台 (Platform for measuring axial rigidity of spiral groove dynamic pressure liquid film of blood pump ) 是由 王义文 陈云 沈朋 赵文涵 周长利 张广钿 王昭 于 2021-09-06 设计创作，主要内容包括：本发明公开了一种用于测量血泵螺旋槽动压液膜轴向刚度的平台,包括立式铣床、血泵模拟装置、压力传感器模块,所述血泵模拟装置固定在所述立式铣床的工作台上,所述血泵模拟装置由导水座、底座、圆筒、泵壳模拟件、螺旋槽台、转子组件、挡流筒组成,所述圆筒、所述泵壳模拟件均固定在所述底座上,所述挡流筒放在所述圆筒顶端,薄膜压力传感器放在所述底座上,所述螺旋槽台放置在所述薄膜压力传感器上,所述转子组件上端与所述立式铣床主轴连接,下端与所述螺旋槽台、薄膜压力传感器共同放置于所述泵壳模拟件内,所述薄膜压力传感器接数据采集卡,所述数据采集卡接电脑。本发明提供了一种结构简单的测量血泵螺旋槽动压液膜轴向刚度的平台。(The invention discloses a platform for measuring axial rigidity of a spiral groove dynamic pressure liquid film of a blood pump, which comprises a vertical milling machine, a blood pump simulation device and a pressure sensor module, the blood pump simulation device is fixed on a workbench of the vertical milling machine and consists of a water guide seat, a base, a cylinder, a pump shell simulation piece, a spiral groove table, a rotor component and a flow blocking cylinder, the cylinder and the pump shell simulation part are both fixed on the base, the flow blocking cylinder is placed at the top end of the cylinder, the film pressure sensor is placed on the base, the spiral groove table is placed on the film pressure sensor, the upper end of the rotor assembly is connected with the spindle of the vertical milling machine, the lower end of the rotor assembly, the spiral groove table and the film pressure sensor are placed in the pump shell simulation piece together, the film pressure sensor is connected with the data acquisition card, and the data acquisition card is connected with a computer. The invention provides a platform with simple structure for measuring axial rigidity of a dynamic pressure liquid film of a spiral groove of a blood pump.)

1. The utility model provides a platform for measuring blood pump helicla flute dynamic pressure liquid film axial rigidity which characterized in that: including vertical milling machine (1), blood pump analogue means (2), pressure sensor module (3), blood pump analogue means (2) comprises water guide seat (21), base (22), drum (23), pump case simulation piece (24), keep off a class section of thick bamboo (25), rotor subassembly (26), spiral groove platform (27), silica gel packing ring (28), silica gel sealing washer (29), first silica gel sealing washer (211), second silica gel sealing washer (210), pressure sensor module (3) comprises film pressure sensor (31), data acquisition card (32) and computer (33), film pressure sensor (31), data acquisition card (32) and computer (33) pass through signal line connection, water guide seat (21) are placed on the workstation of milling machine vertical milling machine (1), there are first wire guide hole (21-1) and delivery port (21-2) on water guide seat (21), the water guide seat (21) is internally provided with a stepped structure, the base (22) is placed on a step of the water guide seat (21), the base (22) is provided with a boss (22-1), a stop column (22-2), a sealing groove (22-3) and a second wire guide hole (22-4), the cylinder (23) and the pump shell simulation piece (24) are fixed on the base (22), the film pressure sensor (31) is placed above the boss (22-1), the spiral groove table (27) is placed above the film pressure sensor (31), the spiral groove table (27) is provided with a small hole (27-1), the bottom of the spiral groove table (27) is provided with a small circular base (27-2), the top of the spiral groove table is provided with a diversion cone (27-3), and the rotor assembly (26) is composed of a rotating shaft (26-3) and a rotor (26-4), the rotating shaft (26-3) is provided with a liquid inlet (26-1) and a pipeline (26-2), the pipeline (26-2) is connected with the liquid inlet (26-1) and is connected with a flow channel of the rotor (26-4) downwards, the rotor (26-4) at the lower part of the rotor assembly (26) is suspended above the spiral groove table (27), the rotating shaft (26-3) penetrates through a hole passage above the pump shell simulation part (24), the liquid inlet (26-1) on the rotating shaft (26-3) is arranged outside the pump shell simulation part (24), the upper end of the rotating shaft (26-3) is clamped by a chuck of the vertical milling machine (1), and the flow blocking cylinder (25) consists of an outer cylinder (25-2) and four same and uniformly distributed flow blocking plates (25-1), the outer cylinder (25-2) is provided with a step structure, and the flow blocking cylinder (25) is assembled above the cylinder (23) through the step structure on the outer cylinder (25-2).

2. The platform for measuring the axial rigidity of the spiral hydrodynamic liquid film of the blood pump according to claim 1, wherein: when the pump shell simulation piece (24) is internally provided with a step (24-1), when the spiral groove platform (27) is placed in a cavity formed by the pump shell simulation piece (24) and the boss (22-1), the upper surface of the spiral groove platform (27) is placed below the step (24-1), the inner diameter of the outer diameter of the spiral groove platform (27) is larger than that of the step (24-1) and is smaller than the outer diameter of the step (24-1), the spiral groove platform is matched with the step (24-1) in a small clearance mode, the small hole (27-1) in the spiral groove platform (27) is sleeved outside the stop column (22-2), the stop column (22-2) can prevent the spiral groove platform (27) from rotating along with liquid driven by the rotor assembly (26) when moving, and the height of the stop column (22-2) is lower than the upper surface height of the small hole (27-1), the diameter of the small round base (27-2) at the lower end of the spiral groove table (27) is smaller than that of the sensitive area of the thin-film pressure sensor (31), and the small round base (27-2) is placed right above the sensitive area of the thin-film pressure sensor (31).

3. The platform for measuring the axial rigidity of the spiral hydrodynamic liquid film of the blood pump according to claim 1, wherein: the sensitive area of film pressure sensor (31) is placed the positive center of boss (22-1), connects the signal line of film pressure sensor (31) is followed first wire guide (21-1), second wire guide (22-4) pass, are connected to the outside on data acquisition card (32), data acquisition card (32) pass through the signal line with computer (33) link to each other, first wire guide (21-1) by first silica gel sealing plug (211) are sealed, second wire guide (22-4) by second silica gel sealing plug (210) are sealed.

4. The platform for measuring the axial rigidity of the spiral hydrodynamic liquid film of the blood pump according to claim 1, wherein: drum (23) with pump case simulation piece (24) have the flange structure, fix through the flange structure on base (22), drum (23) are when sealed, silica gel sealing washer (29) are placed in seal groove (22-3), the flange structure of drum (23) covers sealing washer (29) top is and live through the fix with screw drum (23), pump case simulation piece (24) will silica gel gasket (28) are put base (22) are fixed in the recess of the screw hole top of pump case simulation piece (24), it is fixed during pump case simulation piece (24), the screw passes silica gel gasket (28) are fixed to on base (22).

5. The platform for measuring the axial rigidity of the spiral hydrodynamic liquid film of the blood pump according to claim 1, wherein: the flow blocking cylinder (25) is positioned through a shaft shoulder at a stepped structure on the outer cylinder (25-2) when being installed, the part with the smaller outer diameter of the outer cylinder (25-2) is in contact with the inner wall of the cylinder (23) and is in small interference fit, the cylinder (23) and the flow blocking cylinder (25) are both 3D printing plastic parts, and the flow blocking plate (25-1) and the outer cylinder (25-2) are integrally printed.

6. The platform for measuring the axial rigidity of the spiral hydrodynamic liquid film of the blood pump according to claim 1, wherein: the space formed by the base (22), the cylinder (23) and the flow blocking cylinder (25) is filled with liquid simulating blood, and the surface of the liquid is higher than the highest position of the liquid inlet (26-1) and lower than the highest position of the minimum inner diameter of the flow blocking plate (25-1).

7. The platform for measuring the axial rigidity of the spiral hydrodynamic liquid film of the blood pump according to claim 1, wherein: the water guide seat (21) is internally provided with a stepped structure, the base (22) is placed on the steps of the water guide seat (21), when the spiral groove table (27) is replaced, the screw for fixing the pump shell simulation piece (24) is unscrewed, and the liquid for simulating blood flows into the cavity of the water guide seat (21) from the threaded hole for fixing the pump shell simulation piece (24) and then flows into an external collecting device from the water outlet (21-2).

Technical Field

The invention belongs to the field of dynamic pressure liquid film rigidity measurement, and particularly relates to a blood pump spiral groove dynamic pressure liquid film axial rigidity measurement platform.

Background

When the common disease of heart failure is treated, the mode of implanting the blood pump has better clinical treatment effect. The third generation blood pump mainly has three kinds of magnetic suspension and hydrodynamic suspension or magnetic-liquid coupling suspension at present, and the mode of hydrodynamic suspension has a plurality of, and this blood pump produces the dynamic pressure liquid film according to dynamic pressure liquid film formation principle at the helicla flute department of blood pump case analog piece, makes the rotor suspend under the effect of liquid film thrust, but the blood pump requires higher to the stability of rotor, and the factor that influences rotor stability mainly is the rigidity of liquid film, consequently in order to measure liquid film rigidity, needs to design a special platform of measurement liquid film rigidity. The invention provides a platform for measuring the axial rigidity of a dynamic pressure liquid film of a spiral groove of a blood pump, which has a simple structure and is convenient to use.

Disclosure of Invention

The invention mainly aims to provide a platform for detecting the axial rigidity of a spiral groove dynamic pressure liquid film of a blood pump, which has the characteristics of simple structure and simple operation, and can measure the rigidity of the dynamic pressure liquid film under different parameters compared with the existing liquid film rigidity measuring platform.

The technical scheme of the invention is as follows:

a platform for detecting axial rigidity of a spiral groove dynamic pressure liquid film of a blood pump comprises a vertical milling machine, a blood pump simulation device and a pressure sensor module.

Further: the blood pump simulation device comprises a vertical milling machine, a blood pump simulation device and a pressure sensor module; the blood pump simulation device consists of a water guide seat, a base, a cylinder, a pump shell simulation piece, a flow blocking cylinder, a rotor assembly, a spiral groove platform, a silica gel gasket, a silica gel sealing ring, a first silica gel sealing plug and a second silica gel sealing plug; the pressure sensor module consists of a film pressure sensor, a data acquisition card and a computer; the film pressure sensor, the data acquisition card and the computer are connected through a signal line, the water guide seat is placed on a workbench of the vertical milling machine, a first wire hole and a water outlet are formed in the water guide seat, a stepped structure is arranged in the water guide seat, the base is placed on a step of the water guide seat, a boss, a stop column, a sealing groove and a second wire hole are formed in the base, the cylinder and the pump shell simulation part are fixed on the base, the film pressure sensor is placed above the boss, the spiral groove table is placed above the film pressure sensor, a small hole is formed in the spiral groove table, a small circular base is arranged at the bottom of the spiral groove table, a flow guide cone is arranged at the top of the spiral groove table, the rotor assembly consists of a rotating shaft and a rotor, a liquid inlet and a pipeline are formed in the rotating shaft, and the pipeline is connected with the liquid inlet and then connected with a flow channel of the rotor, the rotor at the lower part of the rotor assembly is suspended above the spiral groove table, the rotating shaft penetrates through a pore passage above the pump shell simulation part, the liquid inlet in the rotating shaft is positioned outside the pump shell simulation part, the upper end of the rotating shaft is clamped by a chuck of the vertical milling machine, the flow blocking cylinder consists of an outer cylinder and four flow blocking plates which are the same and uniformly distributed, a stepped structure is arranged on the outer cylinder, and the flow blocking cylinder is assembled above the cylinder through the stepped structure on the outer cylinder.

Further: the pump case simulation part is internally provided with a step, when the spiral groove table is placed in a cavity formed by the pump case simulation part and the boss, the upper surface of the spiral groove table is arranged below the step, the outer diameter of the spiral groove table is larger than the inner diameter of the step and smaller than the outer diameter of the step, the spiral groove table is in small clearance fit with the step, the small hole in the spiral groove table is sleeved outside the stop column, the stop column can prevent the spiral groove table from rotating along with liquid driven by the rotor assembly when moving, the height of the stop column is lower than that of the upper surface of the small hole, no influence is caused on force measurement, the diameter of the small circular base at the lower end of the spiral groove table is smaller than that of the sensitive area of the thin-film pressure sensor, and the small circular base is placed right above the sensitive area of the thin-film pressure sensor.

Further: film pressure sensor's sensitive area is placed the positive center of boss connects film pressure sensor's signal line is followed first wire guide the second wire guide passes, is connected to the outside on the data acquisition card, the data acquisition card pass through the signal line with the computer links to each other, first wire guide by first silica gel sealing plug is sealed, the second wire guide by second silica gel sealing plug is sealed.

Further: the cylinder with the pump case analog piece has the flange structure, fixes through the flange structure on the base, the cylinder is when sealed, the silica gel sealing washer is placed in the seal groove, the flange structure of cylinder covers the sealing washer top to fix through the screw will the cylinder, the pump case analog piece will when sealed the silica gel packing ring is put the base is fixed in the recess of the screw hole top of pump case analog piece, fixed during the pump case analog piece, the screw passes the silica gel packing ring is fixed on the base.

Further: the flow blocking cylinder is positioned by a shaft shoulder at a stepped structure on the outer cylinder when being installed, the part with the smaller outer diameter of the outer cylinder is in contact with the inner wall of the cylinder and is in small interference fit, the cylinder and the flow blocking cylinder are 3D printing plastic parts, and the flow blocking plate and the outer cylinder are integrally printed.

Further: the space formed by the base, the cylinder and the flow blocking cylinder is filled with liquid simulating blood, and the surface of the liquid is higher than the highest position of the liquid inlet and lower than the highest position of the minimum inner diameter of the flow blocking plate.

Further: the water guide seat is internally provided with a step-shaped structure, the base is placed on the step of the water guide seat, when the spiral groove table is replaced, the screw for fixing the pump shell simulation piece is unscrewed, and the liquid for simulating blood flows into the cavity of the water guide seat from the threaded hole for fixing the pump shell simulation piece and then flows into an external collecting device from the water outlet.

Drawings

FIG. 1 is a schematic isometric view of the structure of the present invention;

FIG. 2 is a three-dimensional cross-sectional view of a blood pump simulation device of the present invention;

FIG. 3 is a front view of the blood pump simulation device of the present invention;

FIG. 4 is a left side full sectional view of the blood pump simulation device of the present invention;

FIG. 5 is a partial enlarged view of the mounting position of the spiral groove table of the blood pump simulation device of the present invention;

FIG. 6 is a partial enlarged view of the mating portion of the upper surface of the spiral groove table and the step of the pump housing simulator of the blood pump simulator of the present invention;

FIG. 7 is a schematic isometric view of a blood pump simulator base structure of the present invention;

FIG. 8 is a partial cross-sectional view of a rotor assembly of the present invention;

fig. 9 is a front view of the spiral grooved table of the present invention.

Detailed Description

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9; the blood pump simulation device comprises a vertical milling machine (1), a blood pump simulation device (2) and a pressure sensor module (3), wherein the blood pump simulation device (2) consists of a water guide seat (21), a base (22), a cylinder (23), a pump shell simulation piece (24), a flow blocking cylinder (25), a rotor assembly (26), a spiral groove platform (27), a silica gel gasket (28), a silica gel sealing ring (29), a first silica gel sealing plug (211) and a second silica gel sealing plug (210), the pressure sensor module (3) consists of a film pressure sensor (31), a data acquisition card (32) and a computer (33), the film pressure sensor (31), the data acquisition card (32) and the computer (33) are connected through signal lines, the water guide seat (21) is placed on a workbench of the vertical milling machine (1), a first wire guide hole (21-1) and a water outlet (21-2) are formed in the water guide seat (21), the water guide seat (21) is internally provided with a stepped structure, the base (22) is placed on a step of the water guide seat (21), the base (22) is provided with a boss (22-1), a stop column (22-2), a sealing groove (22-3) and a second wire guide hole (22-4), the cylinder (23) and the pump shell simulation piece (24) are fixed on the base (22), the film pressure sensor (31) is placed above the boss (22-1), the spiral groove table (27) is placed above the film pressure sensor (31), the spiral groove table (27) is provided with a small hole (27-1), the bottom of the spiral groove table (27) is provided with a small circular base (27-2), the top of the spiral groove table is provided with a diversion cone (27-3), and the rotor assembly (26) is composed of a rotating shaft (26-3) and a rotor (26-4), the rotating shaft (26-3) is provided with a liquid inlet (26-1) and a pipeline (26-2), the pipeline (26-2) is connected with the liquid inlet (26-1) and is connected with a flow channel of the rotor (26-4) downwards, the rotor (26-4) at the lower part of the rotor assembly (26) is suspended above the spiral groove table (27), the rotating shaft (26-3) penetrates through a hole passage above the pump shell simulation part (24), the liquid inlet (26-1) on the rotating shaft (26-3) is arranged outside the pump shell simulation part (24), the upper part of the rotating shaft (26-3) is clamped by a chuck of the vertical milling machine (1), and the flow blocking cylinder (25) consists of an outer cylinder (25-2) and four same and uniformly distributed flow blocking plates (25-1), the outer cylinder (25-2) is provided with a step structure, and the flow blocking cylinder (25) is assembled above the cylinder (23) through the step structure on the outer cylinder (25-2).

In this example, during the installation of the platform and the specific implementation, the water guide seat (21) of the blood pump simulation device (2) is placed on the workbench of the vertical milling machine (1), the base (22) is placed on the step inside the water guide seat (21), the thin film pressure sensor (31) is placed in the center of the boss (22-1), the thin film pressure sensor (31) is connected to the signal line connected to the outside through the second wire hole (22-4) and the first wire hole (21-1) and connected to the data acquisition card (32), the data acquisition card (32) is connected to the computer (33) through the signal line, the second wire hole (22-4) and the first wire hole (21-1) are respectively sealed by the second silica gel sealing plug (210) and the first silica gel sealing plug (211), the spiral groove platform (27) is placed above the s (31), the small circular base (27-2) at the bottom of the spiral groove platform (27) is pressed in a sensitive area of the film pressure sensor (31), the z (27-1) on the spiral groove platform (27) is sleeved outside the stop column (22-2) on the base (22), the rotor (26-4) of the rotor assembly (26) is placed above the spiral groove platform (27), the pump shell simulator (24) penetrates through the rotating shaft (26-3) of the rotor assembly (26) and is sleeved outside the boss (22-1), the film pressure sensor (31) and the rotor (26-4) and is fixed on the pump shell base (22) through a flange structure, the cylinder (23) is sleeved outside the pump shell simulator (24), the silicon rubber gasket (28) for sealing the pump shell simulation piece (24) is placed in a groove above a threaded hole of the base (22) for fixing the pump shell simulation piece (24) before the pump shell simulation piece (24) is fixed, the silicon rubber sealing ring (29) for sealing the cylinder (23) is placed in the sealing groove (22-3) before the cylinder (23) is fixed, the flow blocking cylinder (25) is placed at the top of the cylinder (23), a main shaft of the vertical milling machine (1) is moved to a proper position, a chuck on the main shaft is used for clamping a part above the liquid inlet (26-1) on the rotating shaft (26-3), the blood pump simulation device is fixed on a workbench of the vertical milling machine (1) through a pressing block.

In this example, the platform is replaced by the spiral groove table (27) with different parameters, and in specific implementation, the chuck on the main shaft of the vertical milling machine (1) loosens the rotating shaft (26-3), then the main shaft is moved up to a proper position, the screw for fixing the pump shell simulation part (24) is loosened, meanwhile, the liquid for simulating blood flows into the water guide seat (21), then flows out from the water outlet (21-2) to an external container, the flow blocking cylinder (25) is removed, then the pump shell simulation part (24) and the rotor assembly (26) are taken out, finally the spiral groove table (27) is replaced, then the pump shell simulation part (24), the flow blocking cylinder (25) and the rotor assembly (26) are put back to the original positions, the pump shell simulation part (24) is sealed and fixed, finally the main shaft of the vertical milling machine (1) is reset and the chuck on the main shaft clamps the upper part of the rotating shaft (26-3), after the steps are finished, the liquid simulating the blood is refilled into the space formed by the base (22) and the cylinder (23).

In the example, the rigidity of the hydrodynamic liquid film is measured, in the concrete implementation, the axial position of the main shaft of the vertical milling machine (1) is adjusted, the distance between the bottom of the rotor (26-4) and the upper surface of the spiral groove table (27) reaches the distance to be measured, the liquid simulating blood is introduced into the space formed by the base (22) and the cylinder (23), the liquid level of the liquid completely passes through the liquid inlet (26-1), when the blood pump simulating device (2) simulates a blood pump flow field, the main shaft of the vertical milling machine (1) is adjusted to the rotating speed required by measurement, the liquid simulating blood flows in from the liquid inlet (26-1) under the centrifugal force generated when the rotor (26-4) rotates, and flows into the flow channel of the rotor (26-4) through the pipeline (26-2), and then flows out from an outlet of the pump shell simulation part (24), in the whole process, according to the dynamic pressure liquid film forming principle, a layer of dynamic pressure liquid film is formed at the spiral groove on the upper surface of the spiral groove table (27), the dynamic pressure liquid film can generate axial supporting force, the supporting force can generate a reaction force to act on the spiral groove table (27), the reaction force is sensed by the film pressure sensor (31) and is transmitted to the data acquisition card (32) through a signal line, the axial supporting force is finally displayed and stored on a computer (33), the bearing force of dynamic pressure under different parameters can be acquired by adjusting the axial position of the liquid film of the main shaft of the vertical milling machine (1), and finally the axial rigidity of the dynamic pressure liquid film generated by the spiral groove is calculated according to a dynamic pressure liquid film rigidity calculation formula.

The dynamic pressure liquid film rigidity measuring platform can measure the dynamic pressure liquid film rigidity formed by the spiral grooves with different parameters, and compared with the existing rigidity measuring platform, the dynamic pressure liquid film rigidity measuring platform is simple in structure and low in cost, and meanwhile, the measuring precision can meet the requirement.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the foregoing embodiments and description only for illustrating the principles of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents.