JP5514974B2 - pump - Google Patents

Description

  The present invention relates to a linear drive device that drives a plate-like diaphragm to advance and retreat by interaction with an alternating magnetic field, and a pump including the linear drive device.

  Conventionally, a diaphragm pump is often used as a feeding means for fluid such as liquid. In such a diaphragm pump, the fluid is supplied by elastically deforming the diaphragm. However, since it is difficult to increase the amount of deformation of the diaphragm, it is relatively difficult to supply the fluid at a high pressure. In addition, the diaphragm is likely to be deteriorated due to fatigue due to elastic deformation, and needs to be replaced in a relatively short period of time.

  Therefore, a pump has been proposed in which a rigid plate is used as a diaphragm instead of a diaphragm, a balloon is provided along the outer peripheral edge of the diaphragm, and the diaphragm is vibrated while elastically deforming the balloon. (For example, refer to Patent Document 1).

  In this pump, while the conventional diaphragm pump elastically deforms the diaphragm, the balloon is elastically deformed, so the balloon itself is naturally elastically deformed easily, and easily by adjusting the material of the balloon itself The life can be extended.

  Moreover, since the balloon can be relatively elastically deformed, the amount of movement of the diaphragm can be increased, the amount of fluid discharged can be increased, and the discharge pressure can be improved.

  In such a pump using a diaphragm with a balloon, in order to efficiently drive the diaphragm back and forth, a linear drive device that drives the diaphragm back and forth using an AC magnetic field is used.

  That is, in the linear drive device, a magnet is mounted on the diaphragm, an electromagnet is provided opposite to the magnet, and an alternating magnetic field generated by the electromagnet causes an attractive force and a repulsive force to act alternately between the magnets. Is driving forward and backward.

  In particular, a plurality of magnets are mounted on the diaphragm, and an electromagnet is provided opposite to each magnet, thereby maintaining the diaphragm in a state orthogonal to the advancing / retreating direction by control of each electromagnet. It has also been proposed to drive the diaphragm stably forward and backward so that it can be advanced and retracted (see, for example, Patent Document 2).

JP 2007-120696 A JP 2008-240663 A

  However, when a driving force is generated using a magnet and an electromagnet as in a linear drive device, the magnetic force of the magnet and the electromagnet is not used for generating the driving force, but the magnetic force leaks at a certain rate. It was supposed to be.

  Therefore, not only the efficiency is reduced by the amount of leakage of magnetic force, but also a magnet and electromagnet with as much magnetic force as possible are used in order to drive the diaphragm stably even if the magnetic force is leaked. Therefore, the influence of the leaked magnetic force cannot be ignored.

  In particular, in the medical field, since there is a possibility that the influence of the leaked magnetic force may reach other medical devices, it is necessary to provide a shielding means, and downsizing of the pump is hindered.

  In view of this, the linear drive device of the present invention is a linear drive device having a drive coil that generates a variable magnetic field by energization of an alternating current, and a vibrating body that moves forward and backward by the interaction with the variable magnetic field, the drive coil Is provided with U-shaped cores that generate magnetic poles at both ends, and a magnet is arranged on the vibrator with the surface facing one end of the core as the N pole and the surface facing the other end of the core as the S pole It was decided to. Further, the magnet is characterized in that a soft magnetic material is mounted on the opposite side of the surface facing the core.

  Further, in the pump of the present invention, a housing having a storage chamber for temporarily storing fluid, a supply pipe for connecting the storage chamber to the storage chamber through a one-way valve and feeding the fluid to the storage chamber, and storage The fluid is connected to the chamber via a one-way valve, and the fluid pushed out from the storage chamber is sent to the downstream side, and the fluid is stored from the feed pipe by being placed facing the storage chamber and driven forward and backward. In a pump including a diaphragm that is sucked into a chamber and pushed out to a delivery pipe, and a drive unit that drives the diaphragm to advance and retreat, the drive unit includes a drive coil that generates a variable magnetic field by energization of an alternating current, and the drive A power supply device for supplying an alternating current to the coil for driving, a U-shaped core for generating magnetic poles at both ends is provided on the driving coil, and the surface facing the one end of the core is N The surface facing the other end of the pole and core is the S pole. It was decided to place.

Furthermore, the pump of the present invention is also characterized by the following points.
(1) The magnet is provided with a soft magnetic material on the opposite side of the surface facing the core.
(2) The vibrating body is configured such that regions having N-pole magnetism and regions having S-pole magnetism are alternately arranged along a radial direction on one side surface of a soft magnetic body having a disk shape.
(3) The first storage chamber and the second storage chamber are provided across the diaphragm, and the core provided on the first storage chamber side is opposed to the core provided on the second storage chamber side. about.

  According to the present invention, in a linear drive device having a drive coil that generates a fluctuating magnetic field by energization of an alternating current, and a vibrating body that moves forward and backward by an interaction with the fluctuating magnetic field, and a pump including the linear drive device By providing the driving coil with U-shaped cores that generate magnetic poles at both ends, it is possible to easily suppress leakage of magnetic force generated by the driving coil.

  In particular, the magnet is arranged with the surface facing one end of the core as the N pole and the surface facing the other end of the core as the S pole. And a closed loop-like path are formed together with the magnet, so that the magnetic force generated by the driving coil can be prevented from leaking to the outside.

  In addition, when a soft magnetic material is attached to the magnet, the magnetic force leaking from the magnet can be confined in the soft magnetic material, and the leakage of magnetic force can be further suppressed.

  By suppressing the leakage of magnetic force in this way, the efficiency of the linear drive device can be improved, and the efficiency of the pump using this linear drive device can also be improved, so that the size, low noise, and low power consumption can be improved. It can be a pump.

  In particular, since the leakage of magnetic force is small, it can be used as a drive source in medical equipment, and the magnetic field generated by the drive coil can be effectively used as the drive force. The linear drive device in which the change in electromagnetic force is relatively small during the period can be obtained.

It is a schematic explanatory drawing of the linear drive device concerning embodiment of this invention. It is a schematic explanatory drawing of the linear drive device concerning other embodiment. It is a graph which shows the result of the comparative experiment of the magnitude | size of the attraction | suction force produced | generated by the drive coil. It is a schematic explanatory drawing of the linear drive device concerning other embodiment. It is a section schematic explanatory view of a pump concerning an embodiment of the present invention. It is a schematic explanatory drawing by the side view of the pump. It is explanatory drawing of a 1st magnet. It is a section schematic explanatory view of a pump concerning an embodiment of the present invention.

  A linear drive device according to the present invention and a pump including the linear drive device include a drive coil that generates a variable magnetic field by energizing an alternating current, and a vibrator that moves forward and backward by interaction with the variable magnetic field. , The driving coil is provided with U-shaped cores that generate magnetic poles at both ends, and the vibrating body has an N-pole surface facing one end of the core and a surface facing the other end of the core S. A magnet is arranged as a pole.

  That is, as schematically shown in FIG. 1, a driving coil 1 serving as a driving means includes a U-shaped core 1a and a coil 1b wound around the core 1a. Is connected to a power supply device 2 for passing an alternating current.

  For convenience of explanation, in FIG. 1, the coil 1b is wound only around the central portion of the core 1a. However, for example, the coil 1b may be wound over the entire core 1a as required, and a desired magnetic force can be generated. Thus, the coil 1b may be provided as appropriate.

  The vibrating body 3 is a magnet M having a first magnetic pole region 3a having an N-pole surface facing one end of the core 1a and a second magnetic pole region 3b having an S-pole surface facing the other end of the core 1a. It is composed.

Thus, the magnetic force generated by the driving coil 1 is formed by making the core 1a of the driving coil 1 U-shaped and the vibrating body 3 by the magnet M having the first magnetic pole region 3a and the second magnetic pole region 3b. magnetic lines of force is likely to form a loop-like closed path indicated by broken lines in FIG. 1, the magnetic force generated by the driving coil 1 is suppressed from leaking to the outside, linear drive and less leakage of magnetic force It can be set as the pump provided with the linear drive device.

  Furthermore, as shown in FIG. 2, the vibrating body 3 is not composed of only the magnet M having the first magnetic pole region 3a and the second magnetic pole region 3b, but is soft on the opposite side of the surface of the magnet M facing the core. By mounting the magnetic body F, the magnetic force leaking from the magnet M can be confined in the soft magnetic body F, and the magnetic force generated by the driving coil 1 can be further prevented from leaking to the outside.

  In addition, in this case, as shown in FIG. 3, the attractive force generated between the driving coil 1 and the vibrating body 3, that is, the magnitude of the interaction between the driving coil 1 and the vibrating body 3 is increased. The driving force in the linear drive device can be improved. In FIG. 3, the distance from the driving coil 1 to the vibrating body 3 is a gap.

  By providing the soft magnetic material F in this way, a desired driving force can be obtained even if a smaller driving coil 1 is used, so that the driving coil 1 can be reduced in size. It is possible to reduce the size of the pump using the, and to easily prevent the magnetic force generated by the driving coil 1 from leaking to the outside.

  Note that the linear drive device of the present invention is not limited to use as a pump drive source, and can be used as a drive source for a predetermined vibration motion.

  In addition, when a soft magnetic material is attached to the magnet, the magnet M does not have to be as large as the distance between both ends of the core 1a as shown in FIG. 2, for example, as shown in FIG. In this way, the required magnets m1 and m2 may be provided at positions facing the end of the core 1a using the soft magnetic material F as a support.

  FIG. 5 is a schematic longitudinal sectional view of a pump P provided with the linear drive device of the present invention.

  The pump P of the present embodiment has a first storage chamber 11 surrounded by the first housing 10 and the diaphragm 30 by screwing the first housing 10 and the second housing 20 with the diaphragm 30 interposed therebetween. In addition, the second storage chamber 21 surrounded by the second housing 20 and the diaphragm 30 is formed. That is, the first storage chamber 11 and the second storage chamber 21 are provided with the diaphragm 30 interposed therebetween.

  The first housing 10 and the second housing 20 are each constituted by a cylindrical base, and a male screw portion 12 is formed at one end of the first housing 10 and one end of the second housing 20 is formed. Is formed with a female screw portion 22 which is screwed with the male screw portion 12.

  A first recess 13 is formed on the side surface of the first housing 10 on the side where the male screw 12 is formed. The first recess 13 is formed in a curved surface, and the space formed by the first recess 13 is defined as the first storage chamber 11. It is said. The second housing 20 is provided with a second recess 23 formed in a concave shape on the side surface on the side where the female screw 22 is formed, and the space formed by the second recess 23 is stored in the second reservoir 20. Room 21.

  The first housing 10 is provided with a first feed path 14 and a first feed path 15 formed by penetrating the base body in the vicinity of the central axis of the base body having a cylindrical shape.

  Further, one-way valve mounting portions 14a and 15a to which the one-way valves are mounted are provided in the middle of the first feeding path 14 and the middle of the first sending path 15, respectively. A first one-way valve 14b is mounted on the one-way valve mounting portion 14a, and a first one-way valve 15b is mounted on the one-way valve mounting portion 15a of the first delivery path 15.

  Similarly, the second housing 20 is provided with a second feed path 24 and a second feed path 25 formed by penetrating the base body in the vicinity of the central axis of the base body having a cylindrical shape.

  Further, one-way valve mounting portions 24a and 25a to which one-way valves are mounted are provided in the middle of the second feeding path 24 and the middle of the second sending path 25, respectively. The one-way valve mounting portion 24a is equipped with a second one-way valve 24b for feeding, and the one-way valve mounting portion 25a for the second delivery path 25 is fitted with a second one-way valve 25b for sending.

  Further, the first housing 10 has an end of the driving coil 1 that is U-shaped by using a U-shaped core 1a on the side opposite to the side on which the male screw 12 is formed. Coil end insertion holes H into which the parts are inserted are provided. In the driving coil 1 of this embodiment, the coil 1b is wound over the entire length of the core 1a.

  In the present embodiment, as shown in FIG. 6, the first housing 10 is provided with three driving coils 1, and the first housing 10 has six coil end insertion holes H at predetermined positions. Provided.

  Similarly, in the second housing 20, six coil end insertions in which the end portions of the U-shaped driving coil 1 are respectively inserted on the side surface opposite to the side surface on which the female screw portion 22 is formed. Hole H is provided.

  In this embodiment, as shown in FIG. 5, each coil end insertion hole H provided in the first housing 10 and each coil end insertion hole H provided in the second housing 20 face each other across the diaphragm 30. Although it is in a state, it is not always necessary to be in an opposing state.

  However, when the first housing 10 and the second housing 20 are screwed together, each coil end insertion hole H provided in the first housing 10 and each coil end insertion hole H provided in the second housing 20 are connected to each other. By screwing together so as to face each other across the diaphragm 30, the core 1a provided on the first storage chamber 11 side and the core 1a provided on the second storage chamber 21 side face each other, It is possible to further suppress the leakage of magnetic force generated by the driving coil 1.

  In particular, in this case, the polarity of the core 1a provided on the first storage chamber 11 side facing each other across the diaphragm 30 is opposite to the polarity of the core 1a provided on the second storage chamber 21 side. By adjusting as described above, leakage of magnetic force generated by each driving coil 1 can be further suppressed.

  The first housing 10 is provided with a first fitting recess 18 whose section is recessed in a fan shape with a central angle of 90 degrees along the edge of the first recess 13 on the opening side. Similarly, the second housing 20 is provided with a second fitting recess 28 whose section is recessed in a fan shape with a central angle of 90 degrees along the edge of the second recess 23 on the opening side.

  And the 1st fitting recessed part 18 and the 2nd fitting recessed part 28 form the recessed part by which the 1st housing 10 and the 2nd housing 20 mutually screwed together, and the cross section became semicircle shape, and this recessed part is formed. The diaphragm 30 can be fixedly held by using as will be described later.

  In the present embodiment, the diaphragm 30 includes a circular sheet body 35 that partitions the first storage chamber 11 and the second storage chamber 21, and a balloon 36 provided in a ring shape along the outer peripheral edge of the sheet body 35; A disc-shaped first soft magnetic plate 33 mounted on the side surface of the sheet body 35 on the first storage chamber 11 side, and a first magnet plate 31 mounted on the surface of the first soft magnetic plate 33. A disc-shaped second soft magnetic plate 34 mounted on the side surface of the sheet body 35 on the second storage chamber 21 side, and a second magnet mounted on the surface of the second soft magnetic plate 34 It consists of a plate 32. In particular, the sheet body 35 and the ring-shaped balloon 36 are integrally formed.

  The first magnet plate 31 and the second magnet plate 32 are thin plate-shaped magnets having one side with an N pole and the other side with an S pole. Further, as shown in FIG. The regions having the N-pole magnetism and the S-pole magnetism regions are alternately arranged along the line.

  The arrangement of the region having the N-pole magnetism and the region having the S-pole magnetism is made to correspond to the position of the end portion of each drive coil 1 and causes an interaction with the magnetic field generated in the drive coil 1. I am doing so.

  In the present embodiment, in order to mount the three driving coils 1 on the first housing 10 and the second housing 20, respectively, the first magnet plate 31 and the second magnet plate 32 have three N-pole magnetic regions. And three S-pole magnetism regions are alternately provided along the radial direction, and the N-pole magnetism regions and the S poles are arranged in accordance with the number or placement of the drive coils 1. You may adjust the arrangement | positioning number of the area | region which has the magnetism, or arrangement | positioning position.

  As described above, when the first magnet plate 31 and the second magnet plate 32 are alternately arranged with the regions having the N-pole magnetism and the regions having the S-pole magnetism along the radial direction, the first magnet plate Also in 31 and the 2nd magnet board 32, it is easy to suppress that magnetic force diffuses, and leakage of magnetic force can be suppressed.

  The first magnet plate 31 and the second magnet plate 32 are provided on the first soft magnetic plate 33 and the second soft magnetic plate 34 attached to the sheet body 33 by an adhesive or the like. It is mounted by the magnetic force of the plate 32, and an adhesive is applied between the first magnet plate 31 and the first soft magnetic plate 33 and between the second magnet plate 32 and the second soft magnetic plate 34, respectively. It may be installed more firmly.

  In the present embodiment, the first magnet plate 31 and the second magnet plate 32 are exposed to the first storage chamber 11 and the second storage chamber 21, but the first magnet plate 31 and the second magnet plate 31 The surface of the two magnet plate 32 may be coated with an appropriate resin material such as Teflon (registered trademark).

  In the present embodiment, the ring-shaped balloon 36 is a rubber hollow cylinder made of the same material as the sheet body 35, and air is injected into a predetermined air pressure state. Inside the balloon 36, not only when air is injected, for example, nitrogen gas may be injected, or a liquid having a required viscosity may be injected.

  Further, the balloon 36 is provided with a flange 37 that protrudes outward along the outer peripheral edge. The flange 37 is used for mounting the diaphragm 30 to the housing 10, and includes a first fitting recess 18 provided in the first housing 10 and a second fitting recess 28 provided in the second housing 20. And can be fitted into a fitting recess formed by

  That is, the diaphragm 30 can be stably disposed between the first housing 10 and the second housing 20 by fitting the flange 37 into the fitting recess.

  As described above, the pump P of the present embodiment is formed by screwing the first housing 10 and the second housing 20 with the diaphragm 30 interposed therebetween, and the first feeding path 14 of the first housing 10 includes A first supply pipe 14d is connected via a connection socket 14c, and a first delivery pipe 15d is connected to the first delivery path 15 of the first housing 10 via a connection socket 15c.

  Further, a second feeding pipe 24d is connected to the second feeding path 24 of the second housing 20 via a connecting socket 24c, and a second feeding path 25 of the second housing 20 is connected to the second feeding path 24 via a connecting socket 25c. The second delivery pipe 25d is connected.

  In the pump P, the fluid fed from the first feed pipe 14d to the first storage chamber 11 is sent out from the first delivery pipe 15d and the second feed pipe 24d as the diaphragm 30 is driven forward and backward. The fluid fed to the second storage chamber 21 is sent out from the second delivery pipe 25d.

  That is, each drive coil 1 is connected to a control circuit (not shown), and a predetermined magnetic field is applied to each drive coil 1 from the control circuit to generate a variable magnetic field. Due to the interaction between the magnetic field and the magnetic field of the first magnet plate 31 or the second magnet plate 32, repulsive force and attractive force are caused to act alternately on the vibration plate 30, thereby making the vibration plate 30 the central axis of the first housing 10 and the second housing 20. Drive forward and backward along the direction.

  As the diaphragm 30 moves forward and backward, the diaphragm 30 moves toward the second housing 20 as shown in FIG. 5, thereby sucking fluid from the first supply pipe 14 d into the first storage chamber 11. The fluid in the second storage chamber 21 is pushed out to the second delivery pipe 25d.

  Further, as shown in FIG. 8, when the diaphragm 30 moves to the first housing 10 side, the fluid in the first storage chamber 11 is pushed out to the first delivery pipe 15d and the fluid from the second delivery pipe 24d. Is sucked into the second storage chamber 21.

  Each drive coil 1 is provided with a Hall element (not shown) for detecting the magnetic force generated by each coil, and an output signal of this Hall element is input to the control circuit, and each drive coil 1 The feedback control of the coil 1 may be performed.

  As described above, the feedback coil control of each driving coil 1 can control the attitude of the diaphragm 30, and the diaphragm 30 and the first vibration diaphragm 30 can be controlled in a first position by being inclined with respect to the moving direction. It is possible to prevent the occurrence of problems such as contact with the housing 10 or the second housing 20.

  Here, the feedback control is to adjust the varying magnetic field by adjusting the alternating current to be supplied to each driving coil 1.

1 Driving coil
1a core
1b Coil 2 Power supply 3 Vibration body
10 First housing
11 First reservoir
12 Male thread
13 First recess
14 First supply route
14a One-way valve mounting part
14b First one-way valve
14c articulated socket
14d First feed pipe
15 First delivery path
15a One-way valve mounting part
15b 1-way valve for the first delivery
15c articulated socket
15d 1st delivery pipe
18 First mating recess
20 Second housing
21 Second reservoir
22 Female thread
23 Second recess
24 Second delivery route
24a One-way valve mounting part
24b Second one-way valve for feeding
24c articulated socket
24d Second feed pipe
25 Second delivery path
25a One-way valve mounting part
25b One-way valve for second delivery
25c articulated socket
25d Second delivery pipe
28 Recess for second fitting
30 Diaphragm
31 First magnet plate
32 Second magnet plate
33 First soft magnetic plate
34 Second soft magnetic plate
35 sheet body
36 balloon
37 Flange P Pump H Coil end insertion hole

Claims (4)

A housing having a first storage chamber and a second storage chamber for temporarily storing fluid;
A first feed pipe that communicates with the first storage chamber via a one-way valve and feeds fluid to the first storage chamber;
A second supply pipe that communicates with the second storage chamber via a one-way valve to supply fluid to the second storage chamber;
A first delivery pipe that communicates with the first storage chamber via a one-way valve and sends the fluid pushed out of the first storage chamber downstream;
A second delivery pipe that communicates with the second storage chamber via a one-way valve and sends the fluid pushed out of the second storage chamber downstream;
By advancing drive is disposed between the first reservoir chamber and the second reservoir chamber, the fluid from the second reservoir chamber sucks the first feed pipe or et flow body to the first storage chamber second delivery after pushed out to the tube, a diaphragm push fluid to the first delivery pipe from the first storage chamber sucks the fluid in the second reservoir from the second feed pipe,
In a pump including a drive unit that drives the diaphragm to advance and retreat,
The drive unit is arranged to face the drive coil on the first storage chamber side that generates a variable magnetic field by energization of an alternating current and the drive coil on the first storage chamber side, and generates the variable magnetic field by energization of an alternating current. has a drive coil of the second reservoir chamber side to cause the power supply device for energizing the alternating current to these drive coil,
Each of the driving coil on the first storage chamber side and the driving coil on the second storage chamber side is provided with a U-shaped core that generates magnetic poles at both ends,
The side surface of the first reservoir chamber side of the diaphragm, one end and the opposing region N pole of the core of the drive coil of the first reservoir chamber side, and the other end facing the region of the core to the S pole Place the first magnet ,
On the side surface on the second storage chamber side of the diaphragm, a region facing one end of the core of the driving coil on the second storage chamber side is an N pole, and a region facing the other end of the core is an S pole. While arranging the second magnet,
Pump you characterized in that a soft magnetic material between the first magnet and the second magnet in the diaphragm. The diaphragm is
A sheet body that partitions the first storage chamber and the second storage chamber;
A balloon provided in a ring shape along the outer peripheral edge of the sheet body;
A first soft magnetic body plate mounted as the soft magnetic body on the side of the sheet body on the first storage chamber side;
A second soft magnetic plate mounted as the soft magnetic body on the side of the sheet body on the second storage chamber side;
A first magnet plate mounted as a first magnet on the surface of the first soft magnetic plate;
A second magnet plate mounted as a second magnet on the surface of the second soft magnetic plate;
The pump according to claim 1, comprising: The one end of the driving coil on the first storage chamber side and the one end of the driving coil on the second storage chamber side are opposed to each other, and the other end of the driving coil on the first storage chamber side and the second storage. While facing the other end of the driving coil on the chamber side,
The pump according to claim 2, wherein the polarity of the core of the driving coil on the first storage chamber side is controlled to be opposite to the polarity of the core of the driving coil on the second storage chamber side. A plurality of driving coils on the first storage chamber side and a plurality of driving coils on the second storage chamber side are provided,
The diaphragm is disk-shaped ,
A first region having magnetic regions and the S pole having the magnetism of N pole in each magnet plate and second magnet plates, said diaphragm according to claim 2 or 3, wherein arranged alternately in the circumferential direction of the Pump.

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