JPH04203363A - Pump driving device - Google Patents

Abstract

PURPOSE:To obtain a pump driving device which can be used in an emergency and is highly reliable by driving a generating means by using manually-operated drive, and indicating a pump speed by the generated power and the electrical signals. CONSTITUTION:A rotary handle 3 is fitted to an input shaft 5 in a removable manner at the side where a pump driving device 1 is connected to a pump part 41 and at the opposite side thereof, and this rotation is transmitted to a yoke 31 by means of a power transmission of a speed increase mechanism 9 or the like. Fluid is fed by the rotation of vanes 43a which are vertically fitted to a body of revolution 43 at the pump part 41. When the rotary handle 3 rotates, a magnet 33 rotates at a high speed with a coil 35 fitted in an opposite condition, and alternating current is generated in the coil 35 by electromagnetic induction. This alternating current is rectified and used as a power source of a speed indicating circuit 36. And at the same time, the frequency of the alternating current generated in the coil 35 is counted by means of the speed indicating circuit 36 to indicate the speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a manual pump drive device that is capable of displaying the number of revolutions of a pump.

[Prior Art] Until now, electric motors have been used in medical centrifugal blood pumps, and if a failure occurs in the electric motor or its power supply, or in the event of a power outage, A manual pump drive device was temporarily used, and the number of revolutions was displayed to ensure stable operation of the pump drive device. FIG. 5 shows a schematic structure of a conventional example of a pump drive device and a pump section having this rotation speed display function.

First, before explaining the rotation speed display mechanism, the overall configuration and operation of the pump will be explained. In FIG. 5, the pump section 41 is on the right side, and the pump drive device 1 for driving the pump section 41 is on the left side. The pump section 41 on the right side is
A rotating body 43 is provided inside a pump housing 42 which serves as an internal pump chamber. A plurality of blades 43a erected on this rotary body rotate together with the rotary body 43, thereby sucking in blood from an inlet 42a provided in the pump housing 42 and sending it out from an outlet 42b.

On the other hand, a rotary handle 3 that is manually rotated is attached to the end of the pump drive device 1 on the opposite side to the side where the pump section 41 is provided. By rotating this rotary handle 3, its rotational force is increased by a speed increasing mechanism 9 consisting of a planetary gear train. An output shaft 19 protrudes from the end of the speed increasing mechanism 9 opposite to the side where the rotation handle 3 is provided. A yoke 31, which is a rotating body, and a magnet 33 supported by the yoke 31 are attached to the output shaft 19, and these are rotated at increased speed by the speed increasing mechanism 9. The yoke 31 and the magnet 33 are connected to the magnet 4 attached to the rotating body 43 on the side of the pump section 41.
Together with 4, it constitutes a magnetic coupling.
The rotation of the rotating body 31 of the pump drive device 1 is transmitted to the rotating body 43 of the pump section 41 by the attraction force between the magnet 33 and the magnet 44 .

Therefore, by rotating the rotary handle 3 of the pump drive device 1, the vanes 43a standing up on the rotating body 43 of the pump section 41 rotate at a speed several tens of times faster than the rotary handle 3.
Works to pump blood.

In the pump configured as described above, the conventional rotation speed display mechanism was configured as follows. A support plate 61 for a planetary gear is attached to the input shaft 5 in front of the speed increasing mechanism 9 via a one-way clutch 7, and a portion of a pulley is attached to the outer periphery of the boss portion of this support plate 61. 61a is integrally formed. On the other hand, a DC motor 59 is fixed to the housing 2 of the pump drive device 1. A belt 62 is placed between a pulley 60 attached to the shaft of the DC motor 59 and a part of the pulley 61a, and the rotation of the rotary handle 3 is transmitted through the belt 62 to the DC motor 5.
9. Therefore, when the rotary handle 3 is rotated, the rotation is transmitted to the DC motor 59, and this DC motor 59 is connected to an analog voltmeter.
By displaying the generated voltage of 9 on the display section 37, the number of rotations can be known.

In this way, in conventional pump drive devices, a DC motor is installed inside the pump drive device, and an analog voltmeter is connected to this to display the number of rotations, or a battery is used as a power source to display the number of rotations. I was doing a lot of things.

[Problems to be Solved by the Invention] However, in the conventional pump drive device described above, when a DC voltage is generated by a DC motor,
There have been problems in that the brushes for the commutator of the DC motor are prone to deterioration, require maintenance, and have low reliability. Another problem with analog meters is that it is difficult to directly understand the rotational speed as a numerical value.

In addition, when operating the rotation speed display circuit with a battery, negative batteries need to be replaced, and even if a secondary battery is used, it must be charged before use. There is a problem in that the device may not be usable in some cases.

Therefore, the pump drive device of the present invention has been made in view of the above-mentioned problems, and its purpose is to be usable even in the event of a drive motor failure or power outage, and to be reliable. To provide a pump drive device capable of displaying the number of revolutions of a pump in a display method that is high and intuitively easy to understand.

[Means for Solving the Problems] In order to solve the above-mentioned problems and achieve the purpose, the pump drive device of the present invention is a pump drive device that manually drives the pump to perform liquid feeding. A rotationally driven handle, a power transmission means for transmitting the rotation of the handle to the pump, a power generation means connected to the power transmission means and generating power using the rotational force of the handle, and a power generation means from the power generation means. The apparatus includes an electric circuit that converts the generated electric power into the rotation speed of the pump, and a display means that displays the rotation speed of the pump output from the electric circuit using the electric power generated by the power generation means. It is characterized by

Further, the pump drive device according to the present invention further includes a coupling portion that is magnetically coupled to the pump portion driven by the pump drive device, and a magnet constituting the coupling portion and a coupling portion disposed near the magnet. It is characterized in that the power generation means is constituted by a coil.

Further, the pump drive device according to the present invention is characterized in that the induced voltage is converted into the rotational speed of the pump by counting the frequency of the induced voltage generated by the coil.

Furthermore, the pump drive device according to the present invention is characterized in that the rotational speed of the pump is digitally displayed by the display means.

Further, the pump drive device according to the present invention is characterized in that it is used in a medical centrifugal blood pump.

[Function] As described above, since the pump drive device according to the present invention is configured, the power generation means is driven using the driving force by manual operation, and the pump is driven by the electric power and electric signal generated by the power generation means. It becomes possible to display the rotation speed of the pump, and it is possible to provide a highly reliable pump drive device that can be used even in the event of a drive motor failure or power outage. Furthermore, since the rotation speed of the pump can be displayed digitally, it is possible to provide a pump drive device that can display the rotation speed of the pump in an intuitive and easy-to-understand display method.

[Embodiment] Hereinafter, a preferred embodiment of the pump drive device according to the present invention will be described in detail with reference to FIGS. 1 to 4 of the accompanying drawings.

FIG. 1 is a sectional view showing the structure of a pump drive device 1 and a pump section 41 driven by the pump drive device according to an embodiment. The pump drive device 1 is placed on a mounting base (not shown), and a pump portion 41 is attached to the right side of the pump drive device in the figure. The pump drive device 1 and the pump section 41 are coupled to each other as a detachable connection structure via a magnetic coupling 30, which will be described later.

Here, on the side opposite to the side connected to the pump section 41 of the pump drive device 1, an input shaft 5 projects outward, and a rotary handle 3 is removably attached to the input shaft 5. . Then, the rotation of this rotating handle 3 is
The power is transmitted to the rotating body 31 by a power transmission mechanism such as the speed increasing mechanism 9, as in the conventional pump drive device. Further, in the pump section 41, a rotating body 43 inside the pump section 41
The mechanism for rotating the upright blade 43a to feed liquid is also the same as in the conventional example.

The main difference between this embodiment and the conventional example is that the magnetic coupling section is equipped with a power generation mechanism.

The configuration of this pump drive device 1 will be explained below.

The pump drive device 1 includes a housing 2 as an outer shell, which includes a power transmission mechanism therein. A cylindrical space is formed inside the housing 2, and a first internal gear 2a and a second planetary gear constituting the first planetary gear train of the speed increasing mechanism 9 are formed on the inner peripheral surface of the housing 2. The second internal gears 2b constituting the row are integrally formed coaxially with each other and spaced apart along the axial direction.

A central shaft of a speed increasing mechanism 9 is supported at the center of the housing 2 . This central axis is divided into two parts, an input shaft 5 and an output shaft 19, which are coaxial with each other. One end of each of the input shaft 5 and the output shaft 19 is rotatably supported on the housing 2 by a bearing 6 and a bearing 29, and the connecting portion between the input shaft 5 and the output shaft 19 is connected to the bearing 16.
are rotatably connected to each other via. Therefore, the input shaft 5 and the output shaft 19 are configured to be able to rotate independently with respect to the housing 2.

A support plate 10 for the first planetary gear 13 is attached to the input shaft 5 via a -direction power transmission mechanism 8, which includes a one-way clutch 7 using frictional force or a ratchet mechanism. A support plate 15 on the opposite side is fixed to the support plate 10 with a spacer 12 in between and spaced apart in the axial direction with bolts or the like. These two supporting plates 10
and 15, three first planetary gears 13 are each rotatably held via bearings 11 and arranged approximately equiangularly.

Further, each first planetary gear 13 has, on its outer peripheral side,
A first internal gear 2a formed on the inner peripheral surface of the housing 2
It meshes with the first sun gear 20 on the inner peripheral side. The first sun gear 20 is rotatably supported on the output shaft 19 via a bearing 17.
It is made to be rotatable independently of the Therefore, when the rotary handle 3 is rotated, the first planet gear 13 rotates (revolutions) around the first sun gear 20, and the first planet gear 13 rotates (revolutions) around the first sun gear 20.
0 is the rotational speed increased by the speed increasing ratio of the first planetary gear train, and rotates (rotates) independently of the output shaft 19.

Next, a support plate 21 for holding the second planetary gear 24 is integrally attached to the boss portion 20a of the first sun gear 20 by a press-fitting method. Similar to the first planetary gear 13, three second planetary gears 24 arranged at approximately equal angles are attached to this support plate 21 and a support plate 26 on the opposite side spaced apart from this along the axial direction. between the bearing 23
It is rotatably held through the The support plate 21 and the support plate 26 on the opposite side are connected to each other by bolts with a constant interval maintained along the axial direction via a spacer 25.

The second planetary gear 24 meshes with a second internal gear 2b formed on the inner peripheral surface of the housing 2 on its outer peripheral side, and meshes with a second sun gear 27 on its inner peripheral side. ing. Here, the second sun gear 27 is coaxially fixed to the output shaft 19. Therefore, when the first sun gear 20 rotates, the second planetary gear 24 rotates (revolutions) around the second sun gear 27, and the second sun gear 27 accelerates the second planetary gear train. It rotates (rotates) at a rotational speed increased by the ratio, and this rotation is taken out from the output shaft 1°9 as an output.

Here, a thrust roller bearing 28 is provided between the support plate 10 of the first planetary gear 13 and the housing 2 and between the support plate 15 of the first planetary gear 13 and the support plate 21 of the second planetary gear 24. These thrust roller bearings 28 are the connection portion between the input shaft 5 and the output shaft 19, and play the role of holding both shafts so that they do not tilt.

A yoke 31 is fixed to the output shaft 19, and this yoke 3
A magnet 33 is attached to the outer periphery of 1. This magnet 33 constitutes the magnetic coupling 30 together with a magnet 44 attached to the rotating body 43 of the pump section 41. The pump section 41 and the pump drive device 1 are detachably connected to each other by the magnetic coupling 3o, and by connecting and using the two during pump operation, the rotational output of the pump drive device 1 is transferred to the rotating body 43 of the pump section 41. information is transmitted in a non-contact manner.

Here, the magnet 33 has another function in addition to the above-mentioned magnetic coupling, and together with the coil 35 constitutes a generator. The alternating current generated by this generator is used to drive a rotational speed display circuit 36, which will be described later, and the frequency of the generated alternating current is counted by the rotational speed display circuit 36, thereby displaying the rotational speed of the pump. It is carried out. The power generation function and rotation speed display function will be explained below.

FIG. 4 is a diagram of the magnet 33 viewed from the pump section 41 side. The magnet 33 is divided into a large number of poles on its circumference. On the other hand, a coil 35 is attached to the surface of the housing 2 that faces the magnet 33. This coil 3
3 is a view of 5 viewed from the magnet 33 side. The coil 35 has a structure in which coils having different winding directions are connected in series and arranged in an arc shape in accordance with the number of poles of the magnet 33. In one embodiment, magnet 3
Since 3 has 6 poles, it is desirable to use 6 coils.

However, as long as there is at least one coil, it is possible to generate electricity and display the rotation speed.

By rotating the rotation handle 3 of the pump drive device 1, the magnet 33 is rotated at high speed while facing the coil 35. As a result, magnetic fields in opposite directions are applied to the coil 35 alternately in short cycles, causing electromagnetic induction. An alternating current is generated. By rectifying this alternating current, it is used as a power source for the rotation speed cover circuit 36. At the same time, the frequency of the alternating current generated in the coil 35 is counted by a rotation speed display circuit 36, and the rotation speed is displayed.

FIG. 2 is a block diagram showing the configuration of the rotation speed display circuit 36. As shown in FIG. First, the alternating current generated by the coil 35 is rectified by the power supply circuit 51 and used as a power supply. On the other hand, a voltage waveform generated across one of the diodes used for rectification is shaped into a rectangular wave by a waveform shaping circuit 52. The frequency of the shaped signal wave is divided by a frequency dividing circuit 53 into a number that can be easily converted into a rotational speed. Next, the frequency-divided signal wave is counted up by a counter circuit 54 for a certain period of time.

Thereafter, the number counted up after a certain period of time is stored in the latch circuit 55, and converted into a code by the encoder circuit 56 so that it can be displayed digitally. The converted digital value is then digitally displayed on the display section 37 via the display driver 57. Further, the time for counting up is determined to be a constant time by the reference clock generator 58.

Here, in order to suppress power consumption, it is desirable to use C-MOS for the circuit constituent elements and to use a liquid crystal element for the display section. Furthermore, in order to detect the rotational speed, after rectifying the induced current of the coil 35, a load of a reference resistor may be connected, and the voltage generated across the resistor may be A/D converted and digitally displayed.

Next, the operation of the pump drive device having the above configuration will be explained.

First, when the rotary handle 3 is rotated in the forward direction, the support plate 10 is rotated in the same direction about the input shaft 5 via the one-way clutch 7. At this time, when the rotary handle 3 is rotated in the opposite direction, the one-way clutch 7 idles and the rotational force of the rotary handle 3 is not transmitted to the speed increasing mechanism 9.

When the support plate 10 rotates, the first planetary gear 13 held thereon rotates while meshing with the first internal gear 2a and the first sun gear 20 of the housing 2 at the same time. As a result, the first sun gear 20 is supported by the output shaft 19 via the bearing 17, so that the first planetary gear train is It rotates at a speed increased by the speed increase ratio (approximately 5 times).

On the other hand, when the first sun gear 20 rotates, the second planetary gear 24 rotates while simultaneously meshing with the second internal gear 2b of the housing 2 and the second sun gear 27, and The sun gear 27 rotates at a rotation speed that is increased by the speed increase ratio (approximately 6 times) of the second planetary gear train relative to the rotation speed of the first sun gear 20.

Since the second sun gear 27 is fixed to the output shaft 19, as a result, the output shaft 19 rotates at a rotation speed that is increased by two steps relative to the rotation speed of the rotary handle 3. This speed increase ratio is about 30 times.

When the output shaft 19 rotates, the yoke 31 and magnet 33 attached to the output shaft 19 rotate, and the rotation is transmitted to the rotating body 43 of the pump section 41 by the magnetic coupling 30, and the fluid is pumped in a well-known manner. A sending operation is performed.

At the same time, due to the rotation of the magnet 33, the coil 3
An alternating current is generated at 5, and this alternating current is used as a power source for the rotational speed display circuit 36 mentioned above. The frequency of this alternating current is counted by the rotation speed display circuit 36, and the frequency of the alternating current is counted by the rotation speed display circuit 36.
The rotation speed is displayed digitally.

As explained above, when displaying the rotation speed of the pump drive device, the rotating magnetic field generated by the magnetic coupling is used to generate induced power in the coil, and this power is used to detect and display the rotation speed. The device can be used completely maintenance-free, with no need for battery replacement, charging, or an external power source.

Furthermore, since the pump rotation speed can be displayed digitally, it is easy to intuitively grasp the pump rotation speed.

Note that the present invention can be applied to modifications or variations of the above embodiments without departing from the spirit thereof.

[Effects of the Invention] As described above, in the pump drive device of the present invention, the power generation means is driven using the driving force by manual operation, and the rotation of the pump is controlled by the electric power and electric signal generated by the power generation means. It is possible to display the number, and there is an effect that it is possible to provide a highly reliable pump drive device that can be used even in the event of a drive motor failure or power outage. Further, since the rotation speed of the pump can be displayed digitally, there is an effect that it is possible to provide a pump driving device that can display the rotation speed of the pump in an intuitive and easy-to-understand display method.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the structure of the pump drive device and pump section of one embodiment. Figure 2 is a block diagram showing the configuration of the rotation speed display circuit. Figure 3 is a view of the coil from the magnet side. 4 are views seen from the side of the magnetic pump section, and FIG. 5 is a diagram showing a schematic structure of a conventional example of a pump drive device having a rotation speed display function and a pump section. In the figure, 1... pump drive device, 2... housing,
3... Rotating handle, 5... Input shaft, 6... Bearing, 7... One-way clutch, 8... One-way power transmission mechanism, 9... Speed increasing mechanism, 10... Support Board, 11
... bearing, 12 ... spacer, 13 ... first planetary gear, 15 ... support plate, 16 ... bearing, 17
... bearing, 19 ... output shaft, 20 ... first sun gear, 21 ... support plate, 23 ... bearing, 24 ...
...Second planetary gear, 25...Spacer, 26...
Support plate, 27... Second sun gear, 28... Thrust roller bearing, 29... Bearing, 30... Magnetic coupling, 31... Yoke, 33... Magnet, 35...・Coil 1.36... Rotation speed display circuit, 37... Display section, 41... Pump section, 42...
Pump housing, 43... Rotating body, 44... Magnet, 51... Power supply circuit, 52... Waveform shaping circuit, 53... Frequency dividing circuit, 54... Counter circuit, 55
...Latch circuit, 56...Encoder circuit, 57.
...Display driver, 58...Reference clock generator, 5
9...DC motor, 60...Pulley, 61...
Support plate 62... is a belt.

Claims (5)

[Claims] (1) A pump drive device that manually drives a pump to feed liquid, comprising a handle that is manually driven to rotate, a power transmission means that transmits the rotation of the handle to the pump, and a rotational force of the handle. a power generation means that generates power using the power generation means; an electric circuit that converts the electric power generated by the power generation means into the rotation speed of the pump; 1. A pump driving device, comprising: display means for displaying using the generated electric power. (2) Claim 1, wherein the power generating means is constituted by a magnet that drives the pump by magnetic force, and a coil placed near the magnet.
Pump drive device as described in section. (3) The pump drive device according to claim 2, wherein the induced voltage is converted into the rotational speed of the pump by counting the frequency of the induced voltage generated by the coil. (4) The pump drive device according to claim 1, wherein the rotation speed of the pump is digitally displayed by the display means. (5) The pump drive device according to any one of claims 1 to 4, which is used for a medical centrifugal blood pump.