JPH0821356A - Pump - Google Patents

Abstract

PURPOSE:To prevent the leakage of the fluid to the outside, and improve the workability of a cylinder by moving a slider by a driving device in the axial direction of a cylinder, and also moving a magnetically connected piston in the cylinder. CONSTITUTION:A cylinder 30 which is straight and cylindrical and is provided with a suction port 32 and a discharge port 34 at the respective end parts is provided. A piston 40 having a magnet 42 is stored therein in a reciprocatingly linear motion. A valve 48 is provided on one end part on the cylinder discharge port side of the piston 40. A slider 50 having a magnet 52 which is magnetically connected to the magnet 42 of the piston 40 is provided in a reciprocatingly linear motion on the outer circumferential part of a cylinder 30. A pump is provided with a driving device 60 to allow the reciprocatingly linear motion of the slider 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump for delivering a fluid such as a liquid such as water, a gas such as air, a particulate matter such as fine particles, and more specifically, a magnetic pump in a cylinder. TECHNICAL FIELD The present invention relates to a pump having a piston that is reciprocally moved linearly by mechanical coupling.

[0002]

2. Description of the Related Art FIG. 7 is a schematic sectional view showing an example of a conventional linear drive type pump. This pump comprises a cylindrical cylinder 2 and a cylindrical piston 1 housed in the cylinder 2.
2 and an electromagnet 18 and a spring 20 for moving it up and down.

A suction port 4 and a discharge port 6 for the fluid 22 are provided in the upper portion of the cylinder 2 at right angles to each other, and a suction valve 8 and a discharge valve 10 are provided between them and the cylinder 2.
Are provided respectively.

The piston 12 is provided with a packing 14 that seals between the piston 12 and the cylinder 2, and a magnetic body 16 for attraction by an electromagnet 18. This magnetic body 16
Is composed of, for example, a ring-shaped iron core.

In this example, the electromagnet 18 is composed of two electromagnets arranged at opposite positions. The spring 20 is, for example, a compression coil spring.

The fluid 20 is, for example, a liquid such as water or oil, air, a gas such as various gases, or a particulate material such as fine particles.

In this pump, when the electromagnet 18 is energized, the magnetic force attracts the magnetic substance 16 to lower the piston 12 against the elastic force of the spring 20, while the suction valve 8 opens, The fluid 22 is sucked into the cylinder 2 through the suction port 4.

When the electromagnet 18 is de-energized, the elastic force of the spring 20 causes the piston 12 to rise, at which time the suction valve 8 is closed and the discharge valve 10 is opened to discharge the fluid 22 from the discharge port 6. Be seen.

FIG. 8 is a schematic sectional view showing an example of a conventional crank type pump. This pump is provided with a drive shaft 24 and a crank 26 instead of the magnetic body 16, the electromagnet 18 and the spring 20 in the pump of FIG. 7, and the crank 26 is rotated by this drive shaft 24, and the piston 12 is moved up and down by its action. It was made to let. Others are the same as the pump of FIG.

[0010]

In any of the above pumps, if the packing 14 of the piston 12 wears,
The fluid 22 in the cylinder 2 passes through the packing 14 and the electromagnet part (in the case of the example of FIG. 7) or the crank part (FIG. 8).
In the case of), there is a problem that it leaks to the outside.

The leakage of such fluid, especially liquid,
For example, it is a particularly serious problem in a pump arranged near an electric wiring, a pump for a medical machine, a pump for a chemical machine, and the like.

Further, in any of the above pumps, since the suction port 4 and the discharge port 6 are arranged at right angles to each other on the upper part of the cylinder 2, the shape around the cylinder becomes irregular (not a simple shape). There is a problem that machining around the cylinder is difficult and therefore the machining cost of the cylinder increases.

Therefore, the main object of the present invention is to provide a pump in which fluid does not leak to the outside and which has excellent workability of a cylinder.

In order to achieve the above object, the first pump according to the present invention has a straight cylindrical shape, and has a fluid suction port at one axial end and a discharge port at the other end. And a cylindrical piston housed in the cylinder so as to be capable of reciprocating linear movement in the axial direction thereof, having a magnet on the outer periphery thereof, and provided at one end of the piston on the cylinder discharge port side. A valve that opens and closes the hollow part of the piston by the action of the fluid in the cylinder, and a cylindrical slider that is provided on the outer peripheral part of the cylinder so as to be linearly reciprocable in the axial direction. And a drive device for linearly reciprocating the slider in the axial direction of the cylinder.

A second pump according to the present invention is a cylinder having a straight tubular shape, having a fluid suction port at one axial end and a discharge port at the other axial end, A plurality of N-shaped cylindrical pistons housed in the cylinder so as to be capable of reciprocating linear movement in the axial direction thereof, each having a magnet on its outer peripheral portion, and one end of each piston on the cylinder discharge port side. And a plurality of cylindrical N-shaped cylinders, which are provided in the respective parts to open and close the hollow part of each piston by the action of the fluid in the cylinder, and are provided on the outer peripheral part of the cylinder so as to be linearly reciprocable in the axial direction thereof. Sliders having magnets that are magnetically coupled to the magnets of the pistons on the inner circumference of the sliders, and the sliders are directly reciprocated by shifting the phase by 360 / N degrees in the axial direction of the cylinder. Characterized in that it comprises a drive unit for moving.

[0016]

According to the first pump, when the slider reciprocates linearly in the axial direction of the cylinder by the drive device,
The piston, which is magnetically coupled to it, also reciprocates linearly in the cylinder.

When the piston moves to the suction port side of the cylinder, the valve provided at the one end side of the piston is opened by being pushed by the fluid filled in the hollow portion of the piston, and the piston is opened in the hollow portion. Move to the suction port side while passing the fluid.

When the piston moves toward the discharge port side of the cylinder, the valve of the piston is pushed and closed by the fluid in the cylinder, and the fluid in the cylinder is pushed by the piston in the closed state and is discharged from the discharge port. Is ejected. At the same time,
Since the suction port side of the piston has a negative pressure, fluid is sucked into the cylinder from the suction port.

Then, such an operation is appropriately repeated.

As described above, in this pump, since the piston is housed in the cylinder and the power transmission to the piston is performed by the magnetic force from the outside of the cylinder, the fluid does not leak to the outside.

Further, the cylinder has a simple shape such that it has a straight tubular shape, and an intake port is provided at one axial end thereof and a discharge port is provided at the other axial end thereof. It has excellent properties.

According to the second pump, when the plurality of sliders are linearly reciprocated by shifting the phases in the axial direction of the cylinder by the driving device, the plurality of pistons magnetically coupled to the sliders are also moved in the cylinder. Reciprocating linear motion with different phases.

The action of each piston in that case is as follows.

That is, when each piston moves to the suction port side of the cylinder, the valve provided at the one end side of the piston is opened by being pushed by the fluid filled in the hollow portion of the piston, Moves to the suction port side while allowing the fluid to pass through the hollow portion.

When each piston moves to the discharge port side of the cylinder, the valve of the piston is pushed and closed by the fluid in the cylinder, and the fluid in the cylinder is pushed by the piston in the closed state of the valve. It is discharged from the discharge port. At the same time, since the suction side of the piston becomes negative pressure,
Fluid is sucked into the cylinder from the suction port.

As described above, in this pump, since the piston is housed in the cylinder and the power transmission to the piston is performed by the magnetic force from the outside of the cylinder, the fluid does not leak to the outside.

Further, the cylinder has a simple shape such that it has a straight tubular shape, and an intake port is provided at one axial end and a discharge port is provided at the other axial end thereof. It has excellent properties.

Further, the passage, discharge and suction of the fluid are
The pulsation of the discharged fluid is small because the respective pistons are carried out with their phases shifted from each other.

[0029]

1 is a sectional view showing a pump according to an embodiment of the present invention. This pump has a straight cylindrical shape, and has an inlet 32 for the fluid 22 at one axial end thereof.
And a cylinder 30 having a discharge port 34 for the fluid 22 at the other end. The material forming the cylinder 30 is made of a non-magnetic material such as stainless steel, brass, or resin.

The fluid 22 is a liquid such as water or oil,
Examples thereof include air, gases such as various gases, and particulate matter such as fine particles.

A cylinder-shaped piston 40 is housed in the cylinder 30 so as to be linearly reciprocable in the axial direction of the cylinder 30, as shown by arrows D and E. The material forming the piston 40 is made of a non-magnetic material such as stainless steel, brass and resin.

The piston 40 has two ring-shaped magnets 42 on its outer peripheral portion in this example. Both magnets 42 are permanent magnets, and their polar arrangement is as shown in FIG.
The same poles are opposed to each other with the iron core 44 interposed therebetween. However, the number of the magnets 42 may be one or three or more. Even in the case of three or more magnets, the poles of the adjacent magnets 42 may be arranged so as to have the same pole.

In this example, ring-shaped iron cores 44 are provided on both sides of each magnet 42 to concentrate the magnetic flux.

In this example, packings 46 for sealing the space between the piston 40 and the wall surface of the cylinder 30 are provided at both ends of the outer periphery of the piston 40 in order to drive the fluid 22 more efficiently. The packing 46 is, for example, an O-ring, and is fitted into the groove of the piston 40. However, in the case where the piston 40 has a function of improving the processing accuracy and sealing itself with the wall surface of the cylinder 30 to some extent, the packing 46 may not be provided.

An axial end of the piston 40 and an end of the cylinder 30 on the side of the discharge port 34 are rotatably supported by a rotary shaft 49, and the action of the fluid 22 in the cylinder 30 causes an arrow F to act. A valve 48 that opens and closes as described above to open and close the hollow portion 41 of the piston 40 is provided. That is, when the piston 40 moves in the direction of arrow D, the valve 48 is pushed open by the fluid 22 filled in the hollow portion 41 of the piston 40, and when the piston 40 moves in the direction of arrow E. , And is closed by being pushed by the fluid 22 in the cylinder 30.

A cylindrical slider 50 is provided on the outer peripheral portion of the cylinder 30 as shown by arrows B and C.
It is provided so as to be capable of reciprocating linear movement in the axial direction. In other words, the cylinder 30 is passed through the slider 50. The material forming the slider 50 is made of a non-magnetic material such as stainless steel, brass, or resin.

The slider 50 has an inner peripheral portion facing the magnets 42 of the piston 40 and having a polarity opposite to those of the magnets 42. The slider 50 attracts the magnets 42 through the wall surface of the cylinder 30 to magnetically attract each other. In this example, there are two ring-shaped magnets 52 that are coupled to each other. An example of the polar arrangement is shown in FIG. The magnet 52 may be an electromagnet, but since it requires power supply, a permanent magnet is preferable, and in this embodiment, a permanent magnet is used. The number of the magnets 52 is preferably the same as the number of the magnets 42 of the piston 40.

In this example, ring-shaped iron cores 54 are provided on both sides of each magnet 52 to concentrate the magnetic flux so that the magnetic coupling of the piston 40 with the magnet 42 is strengthened. ing.

In this embodiment, ring-shaped sliding portions 56 are provided at both ends of the inner peripheral portion of the slider 50, respectively.
Friction between the slider 50 and the wall surface of the cylinder 30 is reduced so that the slider 50 can move more lightly.

A drive device 60 is connected to the slider 50 to reciprocate linearly in the axial direction of the cylinder 30 as shown by arrows B and C. The drive device 60 converts the rotation of the motor 62 into the reciprocating linear motion of the slider 50 by the crank 64.

That is, the drive unit 60, in this example, includes a motor 62 for rotating the rotary shaft 63 in the direction of arrow A,
The rotary shaft 63 has a crank 64 whose root is connected, and a lever 66 connected between the tip of the crank 64 and the slider 50. When the rotating shaft 63 of the motor 62 is rotated, for example, in the direction of arrow A, the tip of the crank 64 is moved to the rotating shaft 63.
The lever 66 and the slider 50 make a reciprocating linear motion as indicated by arrows B and C.

Explaining an example of the overall operation of this pump, the motor 62 of the drive unit 60 is rotated to rotate the slider 5
When 0 is reciprocated linearly in the axial direction of the cylinder 30 as shown by arrows B and C, the piston 40 magnetically coupled to it also reciprocates linearly in the cylinder 30 as shown by arrows D and E. .

When the piston 40 moves to the suction port 32 side of the cylinder 30 as shown by the arrow D, the valve 48 of the piston 40 is filled in the hollow portion 41 of the piston 40 as shown in FIG. Open by being pushed by the fluid 22
The piston 40 moves to the suction port 32 side while allowing the fluid 22 to pass through the hollow portion 41.

When the piston 40 moves to the discharge port 34 side of the cylinder 30 as shown by the arrow E, the valve 48 of the piston 40 is pushed by the fluid 22 in the cylinder 30 to close,
The fluid 22 in the cylinder 30 is pushed by the piston 40 with the valve 48 closed and is discharged from the discharge port 34. At the same time, since the suction port 32 side of the piston 40 has a negative pressure, the fluid 22 flows from the suction port 32 into the cylinder 30.
Is inhaled.

Then, such an operation is appropriately repeated.

As described above, in this pump, the piston 40 is housed in the cylinder 30, and the power transmission to the piston 40 is performed from the outside of the cylinder 30 by the magnetic force, so that the fluid 22 leaks to the outside. Does not happen.

By the way, the packing 46 of the piston 40
Unlike the conventional pump, the pump does not seal the inside and outside of the cylinder, but more reliably partitions the suction port 32 and the discharge port 34. Therefore, even if the packing 46 is worn, the driving efficiency of the fluid 22 is slightly increased. It just drops, fluid 2
2 does not leak to the outside.

Further, the cylinder 30 has a straight cylindrical shape, and has a simple shape in which an intake port 32 is provided at one axial end and a discharge port 34 is provided at the other end. Therefore, it has excellent workability.

The conventional pump has a suction valve 8 and a discharge valve 1.
There is a problem that two valves of 0 are required, and the structure thereof is complicated. However, the pump of this embodiment has only one valve, so that the structure is simple, and thus the failure point is required. Is reduced and reliability is improved.

When the piston 40 moves to the suction port 32 side, the valve 40 of the piston 40 is opened and the hollow portion 4 is opened.
Since the fluid 22 is passed at 1, the shape of the hollow portion 41 is
It is preferable that the suction port 32 side is opened as much as possible as in the illustrated example because the resistance to the fluid 22 is small.

In this case, in order to prevent the fluid 22 from being pushed out of the suction port 32 due to the resistance of the piston 40 when the piston 40 moves to the suction port 32 side, for example, as shown in FIG. A check valve 58 that opens and closes as shown by arrow G may be provided in the mouth 32. By doing so, it is possible to reliably prevent the backflow of the fluid 22 once entering the cylinder 30, so that the efficiency of the pump is improved.

The driving device for reciprocating the slider 50 in the axial direction of the cylinder 30 is a motor 6 as in the above example.
A device other than a device in which 2 and the crank 64 are combined, for example, a device using a linear motor, a device using a hydraulic / pneumatic cylinder, or the like may be used.

FIG. 4 shows an example of a pump including a drive device 70 using a linear pulse motor. The parts other than the driving device 70 are the same as those of the embodiment shown in FIG.

The drive unit 70 has two permanent magnets 74 and 76 of opposite polarities, two electromagnets 78 and 80, and a yoke 72 attached to the slider 50 side.
This constitutes the mover. The core forming each electromagnet 78, 70 has two teeth, and the coils are wound on the teeth in opposite directions. Further, the drive device 70 has a rack-shaped stator 82 having a large number of small teeth and arranged so as to face the electromagnets 78 and 80 and parallel to the axial direction of the cylinder 30.

The driving device 70 is a kind of stepping motor that operates according to the well-known (for example, Japanese Patent Publication No. 49-41602) Sawyer's principle, and its operation will be briefly described with respect to two electromagnets 78 and 80. Then, when a predetermined pulse excitation is performed, the mover including the electromagnets 78 and 80 and the slider 50 fixed thereto move one step at a time in the direction of the arrow H along the stator 82, which is the reverse of the above. When the pulse excitation is performed, the mover including the electromagnets 78 and 80 and the slider 50 fixed thereto move along the stator 82 one step at a time in the direction opposite to the above in the arrow H direction. As the slider 50 moves,
The piston 40 also moves in the cylinder 30 and acts as a pump as described above.

In this example, the switching of the pulse excitation, that is, the reversal of the slider 50 is performed by using two switches 84 and 86 provided near both ends of the cylinder 30.

FIG. 5 is a schematic cross-sectional view showing a pump according to still another embodiment of the present invention. The difference from the embodiment of FIG. 1 will be mainly described, and in this embodiment, as described above. Two pistons 40a and 40b are provided in the cylinder 30.
Is stored. Although each of the pistons 40a and 40b is simplified here, the magnet 42, the iron core 44, the packing 46, and the valve 48 are the same as in the embodiment of FIG.
a and 48b respectively.

Two sliders 50a and 50b magnetically coupled to the internal pistons 40a and 40b are provided on the outer peripheral portion of the cylinder 30. Although the respective sliders 50a and 50b are simplified in the illustration here, as in the case of the embodiment of FIG. 1, a magnet 52 and an iron core 54 are provided.
And a sliding portion 56, respectively.

Further, in this embodiment, each slider 50 is
Linear bearings 92a and 92b are provided on the upper portions of a and 50b, respectively, and a slide shaft 90 parallel to the axis of the cylinder 30 is passed through the linear bearings 92a and 92b so that both sliders 50a and 50b can move more smoothly. When such a slide shaft 90 is provided, both sliders 5
The above-mentioned sliding portions 56 of 0a and 50b may be omitted.

A stopper 94 is provided in the center of the cylinder 30 to prevent the pistons 40a, 40b from overshooting when the magnetic coupling between the pistons 40a, 40b and the sliders 50a, 50b is broken. .

Further, in the pump of this embodiment, each slider 5
0a and 50b are provided in the axial direction of the cylinder 30 in this example with a drive device 100 that is linearly reciprocated with a phase difference of 180 degrees. In this specification, the phase difference between the reciprocating linear motions is 0 degree or 360 degrees when moving in the same direction in synchronization with each other, and 180 degrees when moving in the opposite direction in synchronization with each other.

The drive unit 100 includes a motor 102 for rotating the rotary shaft 103 in the direction of arrow A ₁ , a timing pulley 104a connected to the motor 102, and a timing pulley 104b provided on the cylinder axis direction side of the timing pulley 104a.
The timing belt 106 hung between the two, and the cranks 108a and 108b attached to both the timing pulleys 104a and 104b with a phase difference of 180 degrees.
It has levers 110a and 110b connecting them and the sliders 50a and 50b, respectively.

Rotating shaft 103 and timing pulley 10
For example, when 4a is rotated in the direction of arrow A ₁ , the timing pulley 104b is rotated in the direction of arrow A _{2 which} is the same direction as A _1, and the mounting positions of the cranks 108a and 108b with respect to them are shifted by 180 degrees. ,
The sliders 50a and 50b connected to 110b are
In the directions of the arrow B ₁ and the arrow B ₂ or the opposite directions of the arrow C ₁ and the arrow C ₂ , there are 1
It can be reciprocated linearly with a phase shift of 80 degrees.

With the movement of the sliders 50a and 50b, the pistons 40a and 40b magnetically coupled to the sliders 50a and 50b also move to one position in the cylinder 30.
Performs reciprocating linear motion with a phase difference of 80 degrees. The action of each piston 40a, 40b in that case is as follows respectively.

That is, when each piston 40a, 40b moves to the suction port 32 side of the cylinder 30,
0a, 40b valves 48a, 48b correspond to the piston 40
The pistons 40a, 40b are opened by being pushed by the fluid 22 filled in the hollow portions 41a, 41b of the pistons 40a, 40b.
Moves to the suction port 32 side while allowing the fluid 22 to pass through the hollow portions 41a and 41b.

Each piston 40a, 40b is a cylinder 30
When moving to the discharge port 34 side of the piston 40a,
The valves 48a and 48b of 40b are connected to the fluid 2 in the cylinder 30.
The fluid 22 in the cylinder 30 is closed by being pushed by the valve 4.
8a and 48b are pushed by the pistons 40a and 40b in the closed state and discharged from the discharge port 34. At the same time, a negative pressure is applied to the suction ports 32 of the pistons 40a and 40b, so that the fluid 22 flows from the suction ports 32 into the cylinder 30.
Is inhaled.

The passage of the fluid 22 and the discharge and suction of the fluid 22 are performed by the pistons 40a and 40b with their phases shifted by 180 degrees. FIG. 6 illustrates the situation.

The pump of the embodiment shown in FIG. 1 is similar to the pump of the conventional example, but the period for discharging and sucking the fluid 22 is about 1/2 of one cycle, that is, the ratio of the discharging period in one cycle. Is about 50%, whereas in the pump of this embodiment, the fluid 2 is generated by one piston 40a.
When the second piston 40b is passing, the fluid 22 is discharged and sucked by the other piston 40b.
When the fluid 22 is discharged and sucked at 0a, the other piston 40b allows the fluid 22 to pass therethrough, so that the fluid 22 can be discharged and sucked in almost the entire period of one cycle from the viewpoint of the entire pump. The ratio of the ejection period in one cycle is close to 100%. Therefore, the pulsation of the discharged fluid can be reduced.

In the example of FIG. 5, two pistons and two sliders are provided for one cylinder 30, but three or more pistons and sliders may be provided. In that case,
If the number of them is N, each slider is 360 / N.
It suffices to move the phase back and forth linearly by shifting the phase. By providing three or more pistons and three sliders in this way, the pulsation of the discharged fluid can be further reduced.

When a plurality of pistons and a plurality of sliders are provided as described above, a plurality of linear motors may be used as the driving device in addition to the combination of the motor and the plurality of cranks as shown in FIG. It is possible to use the one used, the one using a plurality of hydraulic / pneumatic motors, and the like.

[0071]

Since the present invention is configured as described above, it has the following effects.

According to the pump of the first aspect, since the piston is housed in the cylinder and the power is transmitted to the piston from the outside of the cylinder by the magnetic force, fluid does not leak to the outside.

Further, the cylinder has a simple shape such that it has a straight cylindrical shape and has an intake port at one axial end and a discharge port at the other axial end. It has excellent properties.

Further, the conventional pump needs two valves and its structure is complicated, but the pump of the present invention has only one valve, so that the structure is simple and eventually fails. The number of points is reduced and reliability is improved.

According to the pump of the second aspect, since the piston is housed in the cylinder and the power transmission to the piston is performed by the magnetic force from the outside of the cylinder, the fluid does not leak to the outside.

Further, the cylinder has a simple shape such that it has a straight tubular shape and has an intake port provided at one end in the axial direction and a discharge port provided at the other end. It has excellent properties.

The passage, discharge and suction of the fluid are
The pulsation of the discharged fluid is small because the respective pistons are carried out with their phases shifted from each other.

[Brief description of drawings]

FIG. 1 is a sectional view showing a pump according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state where a valve of the pump of FIG. 1 is open.

FIG. 3 is a diagram showing an example in which a check valve is provided in the suction port.

FIG. 4 is a sectional view showing a pump according to another embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view showing a pump according to still another embodiment of the present invention, in which the parts of the piston and slider are simplified.

FIG. 6 is a diagram showing an operating state of the pump of FIG.

FIG. 7 is a schematic sectional view showing an example of a conventional linear drive type pump.

FIG. 8 is a schematic sectional view showing an example of a conventional crank type pump.

FIG. 9 is an enlarged partial view showing around the magnet of the piston and the slider of the pump shown in FIGS. 1, 2, 3 and 5;

[Explanation of symbols]

 22 Fluid 30 Cylinder 32 Suction Port 34 Discharge Port 40, 40a, 40b Piston 42 Magnet 48, 48a, 48b Valve 50, 50a, 50b Slider 52 Magnet 60, 70, 100 Drive device

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Naotaka Miyamoto 1-10-40 Mikuni Honcho, Yodogawa-ku, Osaka City, Osaka Prefecture Izumi Electric Co., Ltd.

Claims (2)

[Claims] 1. A cylinder having a straight tubular shape, one end of which in the axial direction is provided with a fluid intake port and the other end of which is provided with a discharge port, and a reciprocating straight line in the axial direction in the cylinder. A cylindrical piston that is movably housed and has a magnet on its outer periphery, and a hollow portion of the piston that is provided at one end of the piston on the cylinder discharge port side A valve that opens and closes, and a cylindrical slider that is provided on the outer peripheral portion of the cylinder so as to reciprocate linearly in the axial direction thereof and that has a magnet that is magnetically coupled to the magnet of the piston on the inner peripheral portion And a drive device that linearly reciprocates the slider in the axial direction of the cylinder. 2. A cylinder having a straight tubular shape and provided with a fluid inlet at one axial end and a fluid outlet at the other end, and a reciprocating straight line in the axial direction in the cylinder. A plurality of N pistons, which are movably housed and have a cylindrical shape, each having a magnet on the outer periphery thereof, and one of the pistons, which is provided at one end on the cylinder discharge port side of each piston. A valve that opens and closes the hollow portion by the action of the fluid in the cylinder, and a plurality of N-shaped cylindrical sliders that are provided on the outer peripheral portion of the cylinder so as to be capable of reciprocating linear movement in the axial direction. Each slider has a magnet that is magnetically coupled to the magnet of each piston, and each slider is placed in the axial direction of the cylinder.
A pump comprising: a drive device for reciprocating linear movement with a phase shift of 0 / N degrees.