WO2016151998A1 - Unité de buse pour dispositif à jet de liquide, unité d'actionneur pour dispositif à jet de liquide, et pièce à main pour dispositif à jet de liquide - Google Patents

Unité de buse pour dispositif à jet de liquide, unité d'actionneur pour dispositif à jet de liquide, et pièce à main pour dispositif à jet de liquide Download PDF

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Publication number
WO2016151998A1
WO2016151998A1 PCT/JP2016/000702 JP2016000702W WO2016151998A1 WO 2016151998 A1 WO2016151998 A1 WO 2016151998A1 JP 2016000702 W JP2016000702 W JP 2016000702W WO 2016151998 A1 WO2016151998 A1 WO 2016151998A1
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WIPO (PCT)
Prior art keywords
side diaphragm
liquid
liquid chamber
ejecting apparatus
diaphragm
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PCT/JP2016/000702
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English (en)
Japanese (ja)
Inventor
栗原　徹
壮輔 山▲崎▼
明男 小林
将巳 内田
Original Assignee
セイコーエプソン株式会社
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Application filed by セイコーエプソン株式会社 filed Critical セイコーエプソン株式会社
Publication of WO2016151998A1 publication Critical patent/WO2016151998A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32—Surgical cutting instruments
    • A61B17/3203—Fluid jet cutting instruments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/04—Pumps having electric drive

Definitions

  • the present invention relates to liquid injection.
  • An applicator (handpiece) that ejects liquid from an ejection pipe is known to be configured such that a tip (nozzle unit) and a main body (actuator unit) can be attached and detached (Patent Document 1).
  • Each of the main body portion and the tip portion includes a diaphragm.
  • the two diaphragms come into contact with each other in a state where the main body portion and the tip portion are assembled.
  • the diaphragm of the main body deforms according to the expansion and contraction of the piezoelectric element.
  • the diaphragm at the tip section defines a part of the liquid chamber.
  • the present invention is for solving the above-described problems and can be realized as the following forms.
  • a liquid ejecting apparatus nozzle unit that is attached to an actuator unit for a liquid ejecting apparatus that includes a drive-side diaphragm that deforms as the piezoelectric element expands and contracts.
  • the nozzle unit for a liquid ejecting apparatus a liquid chamber side diaphragm that comes into contact with the driving diaphragm when mounted on the actuator unit for the liquid ejecting apparatus; a part of which is partitioned by the liquid chamber side diaphragm; A liquid chamber in which the liquid chamber can be varied; an ejection pipe for ejecting liquid from the liquid chamber; and the liquid chamber-side diaphragm is curved.
  • the curved shape of the liquid chamber side diaphragm can be used to suitably contact the drive side diaphragms having various shapes.
  • the liquid chamber side diaphragm may have a convex shape outside the liquid chamber.
  • the liquid chamber side diaphragm is pressed against the drive side diaphragm in a state where the liquid ejecting apparatus nozzle unit is mounted on the liquid ejecting apparatus actuator unit (hereinafter also referred to as “mounted state”). It becomes easy.
  • the liquid chamber-side diaphragm is likely to have good followability when the piezoelectric element contracts in deformation that occurs as the piezoelectric element expands and contracts.
  • the liquid chamber side diaphragm may have a concave shape outside the liquid chamber.
  • the liquid chamber side diaphragm is suppressed from being turned over by being pushed by the driving side diaphragm. Since the liquid chamber side diaphragm has a concave shape outside the liquid chamber, it does not turn over even if it is pushed from the outside of the liquid chamber.
  • the drive side diaphragm may have a convex shape on the side opposite to the piezoelectric element.
  • the liquid chamber side diaphragm can be suitably brought into contact with the drive side diaphragm. Since the drive side diaphragm has a convex shape opposite to the piezoelectric element, it is easy to be pressed against the liquid chamber side diaphragm in the mounted state. As a result, the liquid chamber-side diaphragm is likely to have good followability when the piezoelectric element contracts in deformation that occurs as the piezoelectric element expands and contracts.
  • the liquid chamber side diaphragm may be made of metal. According to this form, it becomes easy to process the liquid chamber side diaphragm into a desired curved shape.
  • the liquid chamber side diaphragm may be thinner than the driving side diaphragm. According to this embodiment, since the liquid chamber side diaphragm is easily deformed, the volume of the liquid chamber is efficiently changed by expansion and contraction by the piezoelectric element.
  • a nozzle unit for a liquid ejecting apparatus comprising: a liquid chamber partly partitioned by a liquid chamber side diaphragm and having a variable chamber volume; and an ejection pipe for ejecting liquid from the liquid chamber
  • an actuator unit for a liquid ejecting apparatus to be mounted on the apparatus.
  • the actuator unit for a liquid ejecting apparatus includes: a driving side diaphragm that comes into contact with the liquid chamber side diaphragm when mounted on the nozzle unit for the liquid ejecting apparatus; and a piezoelectric element that deforms the driving side diaphragm;
  • the drive side diaphragm has a convex shape on the opposite side to the piezoelectric element.
  • the drive side diaphragm since the drive side diaphragm has a convex shape on the opposite side to the piezoelectric element, it is easy to be pressed against the liquid chamber side diaphragm in the mounted state. As a result, the liquid chamber-side diaphragm is likely to have good followability when the piezoelectric element contracts in deformation that occurs as the piezoelectric element expands and contracts.
  • the liquid chamber side diaphragm may be curved. According to this aspect, the curved shape of the liquid chamber side diaphragm can be used to suitably contact the convex drive side diaphragm.
  • the liquid chamber side diaphragm may have a convex shape outside the liquid chamber. According to this aspect, since the liquid chamber side diaphragm has a convex shape outside the liquid chamber, the liquid chamber side diaphragm is easily pressed against the drive side diaphragm in the mounted state. As a result, the liquid chamber-side diaphragm is likely to have good followability when the piezoelectric element contracts in deformation that occurs as the piezoelectric element expands and contracts.
  • the liquid chamber side diaphragm may have a concave shape outside the liquid chamber. According to this embodiment, the liquid chamber side diaphragm is suppressed from being turned over by being pushed by the driving side diaphragm. Since the liquid chamber side diaphragm has a concave shape outside the liquid chamber, even if it is pushed by the drive side diaphragm from the outside of the liquid chamber, it does not turn over.
  • the drive side diaphragm may be made of metal.
  • the liquid chamber side diaphragm can be deformed into a smooth shape. This is because the drive side diaphragm is made of metal, so that the deformation of the drive side diaphragm due to expansion and contraction of the piezoelectric element does not increase locally but occurs to bend as a whole. As a result, the liquid chamber side diaphragm which is deformed by being pushed by the driving side diaphragm is deformed into a smooth shape.
  • the driving side diaphragm may be thicker than the liquid chamber side diaphragm.
  • the liquid chamber side diaphragm can be smoothly deformed. This is because the drive side diaphragm is thick, so that the deformation of the drive side diaphragm due to expansion and contraction of the piezoelectric element does not increase locally but occurs so as to bend as a whole. As a result, the liquid chamber side diaphragm which is deformed by being pushed by the driving side diaphragm is deformed into a smooth shape.
  • the piezoelectric element may be preloaded. According to this form, expansion and contraction by the piezoelectric element is appropriately realized.
  • the present invention can be realized in various forms other than the above.
  • it can be realized as a handpiece for a liquid ejecting apparatus in which the actuator unit for the liquid ejecting apparatus and the nozzle unit for the liquid ejecting apparatus are combined.
  • a liquid ejecting apparatus including a liquid ejecting apparatus handpiece and a liquid supply apparatus.
  • FIG. 2 is a schematic configuration diagram of a liquid ejecting apparatus.
  • FIG. 4 is an enlarged cross-sectional view around the liquid chamber (mounted state).
  • Sectional drawing of liquid chamber side diaphragm and drive side diaphragm vicinity (separated state). Sectional drawing near the liquid chamber side diaphragm and the drive side diaphragm (maximum state). Sectional drawing near the liquid chamber side diaphragm and the drive side diaphragm (minimum state). Sectional drawing of the liquid chamber side diaphragm and the drive side diaphragm vicinity (modification 1). Sectional drawing of liquid chamber side diaphragm and drive side diaphragm vicinity (modification 2). The table which shows the combination of the liquid chamber side diaphragm and the drive side diaphragm.
  • FIG. 1 schematically shows a configuration of the liquid ejecting apparatus 20.
  • the liquid ejecting apparatus 20 is a medical device used in a medical institution, and has a function of excising an affected part by ejecting liquid onto the affected part.
  • the liquid ejecting apparatus 20 includes a control unit 30, an actuator cable 31, a pump cable 32, a foot switch 35, a suction device 40, a suction tube 41, a liquid supply device 50, and a handpiece 100 (operation unit). With.
  • the liquid supply device 50 includes a water supply bag 51, a spike needle 52, first to fifth connectors 53a to 53e, first to fourth water supply tubes 54a to 54d, a pump tube 55, a blockage detection mechanism 56, And a filter 57.
  • the handpiece 100 includes a nozzle unit 200 and an actuator unit 300.
  • the nozzle unit 200 includes an ejection tube 205 and a suction tube 400.
  • the water supply bag 51 is made of a transparent synthetic resin, and is filled with a liquid (specifically, physiological saline). In addition, in this application, even if it fills with liquids other than water, it calls the water supply bag 51.
  • FIG. The spike needle 52 is connected to the first water supply tube 54a via the first connector 53a. When the spike needle 52 is stabbed into the water supply bag 51, the liquid filled in the water supply bag 51 can be supplied to the first water supply tube 54a.
  • the first water supply tube 54a is connected to the pump tube 55 via the second connector 53b.
  • the pump tube 55 is connected to the second water supply tube 54b via the third connector 53c.
  • the tube pump 60 sandwiches the pump tube 55 between the stator and the rotor.
  • the tube pump 60 handles the pump tube 55 by rotating a plurality of rollers by rotation of a built-in motor. By being handled in this way, the liquid in the pump tube 55 is sent out from the first water supply tube 54a side to the second water supply tube 54b side.
  • the blockage detection mechanism 56 detects the blockages in the first to fourth water supply tubes 54a to 54d by measuring the pressure in the second water supply tube 54b.
  • the second water supply tube 54b is connected to the third water supply tube 54c via the fourth connector 53d.
  • a filter 57 is connected to the third water supply tube 54c. The filter 57 collects foreign matters contained in the liquid.
  • the third water supply tube 54c is connected to the fourth water supply tube 54d via the fifth connector 53e.
  • the fourth water supply tube 54d is connected to the handpiece 100.
  • the liquid supplied to the handpiece 100 through the fourth water supply tube 54d is intermittently ejected from the nozzle 207 provided at the tip of the ejection tube 205 by driving the actuator unit 300. In this way, the liquid is intermittently ejected, so that the resecting capability can be secured with a small flow rate.
  • the injection tube 205 and the suction tube 400 constitute a double tube having the injection tube 205 as an inner tube and the suction tube 400 as an outer tube.
  • the suction tube 41 is connected to the nozzle unit 200.
  • the suction device 40 sucks the inside of the suction tube 400 through the suction tube 41. By this suction, liquid near the tip of the suction tube 400, a cut piece, and the like are sucked.
  • the control unit 30 controls the tube pump 60 and the actuator unit 300. Specifically, the control unit 30 transmits a drive signal via the actuator cable 31 and the pump cable 32 while the foot switch 35 is depressed. The drive signal transmitted via the actuator cable 31 drives the actuator unit 300. The drive signal transmitted via the pump cable 32 drives the tube pump 60. Therefore, the liquid is intermittently ejected while the user steps on the foot switch 35, and the liquid ejection stops while the user does not step on the foot switch 35.
  • FIG. 2 and 3 are perspective views of the handpiece 100.
  • FIG. FIG. 2 shows a state where the actuator unit 300 is attached to the nozzle unit 200 (hereinafter referred to as “attached state”).
  • FIG. 3 shows a state where the actuator unit 300 and the nozzle unit 200 are separated (hereinafter referred to as “separated state”).
  • the actuator unit 300 is configured to be detachable from the nozzle unit 200.
  • the actuator unit 300 is attached to the nozzle unit 200, and the actuator unit 300 and the nozzle unit 200 are integrated to function as the handpiece 100.
  • the nozzle unit 200 is replaced every operation because the liquid flows inside. Further, among the components included in the liquid supply device 50, the ones in which the liquid flows (the water supply bag 51, the first to fourth water supply tubes 54a to 54d, the pump tube 55, etc.) are replaced every operation. Since the actuator unit 300 does not touch the liquid, it can be used in a plurality of operations by performing a sterilization process or a cleaning process.
  • the nozzle unit 200 includes a handpiece case 210, a joint portion 250, and a suction force adjusting mechanism 500 in addition to the above-described injection tube 205 and suction tube 400.
  • the handpiece case 210 has a function as a grip held by the user and a function of holding the flow path inside. This flow path is a flow path through which the liquid to be ejected and the liquid to be sucked flow as described above.
  • the suction force adjusting mechanism 500 is provided in the handpiece 100 and includes a hole 522.
  • the opening area of the hole 522 changes, the suction force by the suction pipe 400 changes (detailed with FIG. 5).
  • the joint part 250 is a part for attaching / detaching the actuator unit 300 to / from the nozzle unit 200.
  • the actuator unit 300 includes a connecting part 310 and a driving part 350.
  • the connecting portion 310 mechanically and electrically connects the actuator cable 31 and the drive portion 350.
  • the driving unit 350 generates a driving force for intermittently ejecting the liquid.
  • FIG. 4 is a perspective view showing the nozzle unit 200.
  • FIG. 4 shows a state in which the suction tube 400 is removed from the handpiece case 210.
  • the handpiece 100 may be used with the suction tube 400 removed.
  • suction using the suction tube 400 is not possible, but liquid can be ejected from the ejection tube 205.
  • the suction tube 400 includes a convex portion 410.
  • the convex part 410 is a part for attaching the suction tube 400 to the handpiece case 210.
  • the fourth water supply tube 54 d is connected to the handpiece case 210. 2 and 3 do not show the fourth water supply tube 54d because of the line of sight.
  • FIG. 5 is a cross-sectional view showing the handpiece 100.
  • the fourth water supply tube 54d is bent in a U shape inside the handpiece case 210 and connected to the inlet channel 241.
  • the inlet channel 241 communicates with the ejection pipe 205 via the liquid chamber 240 (see FIGS. 8 and 9).
  • the channel diameter of the inlet channel 241 is smaller than the channel diameter of the injection pipe 205. For this reason, even if the pressure in the liquid chamber 240 fluctuates (described later), the liquid in the liquid chamber 240 is prevented from flowing back into the inlet channel 241.
  • the handpiece case 210 has a recess 211 at the tip.
  • the attachment of the suction pipe 400 is realized by fitting the convex portion 410 into the concave portion 211.
  • the attached suction tube 400 communicates with the suction flow path section 230.
  • the suction flow path unit 230 is connected to the suction tube 41 via the suction force adjustment mechanism 500.
  • the user can adjust the suction force by the suction tube 400 using the hole 522. Specifically, if the area where the hole 522 is opened is reduced, the flow rate of air flowing in from the hole 522 is also reduced, so that the flow rate of fluid (air, liquid, etc.) sucked through the suction pipe 400 is reduced. growing. That is, the suction force by the suction pipe 400 is increased. On the contrary, if the area where the hole 522 is opened is increased, the flow rate of the air flowing from the hole 522 is also increased, so that the suction force by the suction pipe 400 is reduced. Usually, the user adjusts the open area of the hole 522 by adjusting the area where the hole 522 is closed by the thumb.
  • the shape of the hole 522 is designed so that the suction force by the suction pipe 400 becomes minute or no suction force acts.
  • the flow area of the suction pipe 400 is larger than the opening area of the hole 522
  • the flow resistance of the suction pipe 400 is reduced by making the length of the suction pipe 400 longer than the length of the hole 522. It is larger than the flow path resistance. In this way, when the hole 522 is not covered at all, the suction force by the suction tube 400 can be made minute.
  • the longitudinal direction is defined with respect to the handpiece case 210.
  • the longitudinal direction is a direction included in the cross section shown in FIG. 5 and is a horizontal direction in a predetermined posture.
  • the predetermined posture is a posture when the user holds the handpiece 100 with the hand after the palm is turned up.
  • the longitudinal direction in the present embodiment matches the flow path direction of the suction flow path section 230.
  • the flow path direction of the suction flow path section 230 is a flow direction in the suction flow path section 230 at a portion where the suction flow path section 230 is in contact with the suction force adjustment mechanism 500.
  • FIG. 6 and 7 are enlarged sectional views showing the vicinity of the joint portion 250 and the actuator unit 300.
  • FIG. FIG. 6 shows a mounted state.
  • FIG. 7 shows a separated state.
  • the driving unit 350 includes a housing 351, a fixed member 353, a piezoelectric element 360, and a movable plate 361.
  • the housing 351 is a cylindrical member.
  • the movable plate 361 includes a piston 362 and a drive side diaphragm 364.
  • Piezoelectric element 360 is a laminated piezoelectric element.
  • the piezoelectric element 360 is disposed in the housing 351 so that the extending and contracting direction is along the longitudinal direction of the housing 351.
  • the piezoelectric element 360 in the present embodiment has a substantially regular quadrangular prism shape, is 3.5 mm square, and has a height of 18 mm.
  • the fixing member 353 is fixed to one end of the housing 351.
  • the piezoelectric element 360 is fixed to the fixing member 353 with an adhesive.
  • the material of the drive side diaphragm 364 is a metal, specifically stainless steel, and more specifically SUS304 or SUS316L.
  • the drive side diaphragm 364 is formed thicker (for example, 300 ⁇ m) in order to preload the piezoelectric element 360 (described later). Further, since the piezoelectric element 360 is made of metal and is formed thick, it is smoothly curved when pushed by the piston 362. For this reason, the liquid chamber side diaphragm 260 can also be smoothly deformed in the mounted state.
  • the drive side diaphragm 364 is disposed so as to cover the other end of the housing 351 and is fixed to the housing 351 by welding.
  • the piston 362 is fixed to one end of the piezoelectric element 360 with an adhesive and is disposed so as to contact the drive side diaphragm 364.
  • the piston 362 has a shape in which cylinders having different diameters are stacked as concentric circles. The smaller diameter is in contact with the drive side diaphragm 364. For this reason, the drive side diaphragm 364 is not pushed toward the end, and a large force does not act on the welded portion.
  • the piston 362 and the drive side diaphragm 364 are not fixed by an adhesive or the like but are only in contact with each other.
  • a male screw portion 351a is provided on the outer periphery of the housing 351. The transition from the separated state to the mounted state is realized by tightening the male screw portion 351a to the female screw portion 253 provided in the joint portion 250.
  • the connecting portion 310 includes a first case 311, a second case 312, a third case 313, a holding member 314, a metal plate 315, a first screw 316, a second screw 317, and a third screw 318. Is provided. Note that the metal plate 315 can also be referred to as the relay substrate 315.
  • the first case 311 is fixed to the fixing member 353 by the first screw 316.
  • the second case 312 is fixed to the first case 311 by a second screw 317 and a third screw 318.
  • the two metal plates 315 are inserted (accommodated) in the first case 311.
  • the holding member 314 is fixed by being crimped near the end of the actuator cable 31.
  • the third case 313 is a member for connecting the second case 312 and the holding member 314.
  • the third case 313 is fixed to the second case 312 in a state where the portion where the outer diameter of the holding member 314 is expanded is hooked.
  • the actuator cable 31 is connected so as to be electrically connected to the two metal plates 315 while being fixed as described above.
  • the metal plate 315 is connected to the positive electrode and the negative electrode of the piezoelectric element 360 by wiring (not shown).
  • Piezoelectric element 360 expands and contracts in response to a drive signal input via actuator cable 31, metal plate 315, and the above wiring.
  • the piston 362 vibrates in the longitudinal direction of the piezoelectric element 360.
  • the drive side diaphragm 364 is deformed following the vibration.
  • the piezoelectric element 360 is assembled in a preloaded state in order to appropriately perform expansion and contraction.
  • the preloaded state is a state in which the piezoelectric element 360 is pressed toward the driving diaphragm 364 and the piezoelectric element 360 is compressed in the expansion / contraction direction.
  • the preload load is 10 to 50% of the maximum generated force of the piezoelectric element 360, specifically 40 to 200N. For this reason, even when a drive signal is not input to the piezoelectric element 360, the drive side diaphragm 364 receives force from the piezoelectric element 360 via the piston 362. The reason that the drive side diaphragm 364 is made of metal and is thicker than the liquid chamber side diaphragm 260 is to hold the preload.
  • the drive side diaphragm 364 is deformed as described above, the drive side diaphragm 364 can be deformed following the contraction of the piezoelectric element 360 even if it is not bonded to the piston 362.
  • FIG. 8 and 9 are cross-sectional views showing the vicinity of the liquid chamber 240 in an enlarged manner.
  • FIG. 8 shows a mounted state.
  • FIG. 9 shows the separated state.
  • a liquid chamber 240 is provided inside the joint portion 250.
  • the liquid chamber 240 is formed by covering the recess 244 with the liquid chamber side diaphragm 260.
  • the recess 244 is a portion that is thin and circularly recessed in the joint portion 250.
  • the liquid chamber side diaphragm 260 is formed thinner than the driving side diaphragm 364 (for example, 50 to 100 ⁇ m) so as to be easily deformed in accordance with expansion and contraction of the piezoelectric element 360.
  • the liquid chamber side diaphragm 260 has a diameter of 13 to 15 mm, and is fixed to the joint portion 250 by welding. The welding position is shown as welding Y1 shown in FIG.
  • the material of the liquid chamber side diaphragm 260 is a metal, specifically stainless steel, and more specifically SUS304 or SUS316L.
  • the liquid chamber side diaphragm 260 and the drive side diaphragm 364 are in contact with each other in the mounted state. For this reason, as described above, when the driving side diaphragm 364 is deformed, the liquid chamber side diaphragm 260 is similarly deformed.
  • the volume of the liquid chamber 240 changes. Due to this variation, the pressure of the liquid filled in the liquid chamber 240 varies. When the pressure in the liquid chamber 240 decreases, the liquid flows into the liquid chamber 240 from the inlet channel 241. When the pressure in the liquid chamber 240 increases, the liquid flows out from the liquid chamber 240 to the ejection pipe 205. The liquid that has flowed out to the ejection tube 205 is ejected from the tip of the ejection tube 205. Since the pressure in the liquid chamber 240 rises intermittently, the liquid is ejected from the ejection pipe 205 intermittently.
  • the liquid chamber side diaphragm 260 and the drive side diaphragm 364 are integrally deformed. That is, the liquid chamber side diaphragm 260 and the movable plate 361 are integrally deformed.
  • Reference numeral 460 shown in FIG. 8 indicates a composite diaphragm 460 in which the liquid chamber side diaphragm 260 and the movable plate 361 that are integrally deformed in this manner are combined.
  • the composite diaphragm 460 can be regarded as one diaphragm in the mounted state.
  • FIG. 10 is a view for explaining the welding of the liquid chamber side diaphragm 260 and the driving side diaphragm 364.
  • the housing 351 is provided with a chamfer 351b as shown in FIG.
  • the chamfer 351b is provided so that the weld Y1 that fixes the liquid chamber side diaphragm 260 and the housing 351 do not interfere with each other.
  • the front end of the housing 351 is retracted by a dimension C from the front end of the drive side diaphragm 364.
  • a clearance is generated between the liquid chamber side diaphragm 260 and the housing 351 in the mounted state.
  • symbol 255 shown by FIG. 10 shows the escape part 255 provided in another form. In this embodiment, as shown in FIG. 8, FIG. 9, etc., the escape part 255 is not provided.
  • the relief portion 255 is a portion of the inner periphery of the joint portion 250 where the wall is sunk toward the inside. By providing the relief portion 255, the internal thread portion 253 can be easily processed.
  • FIG. 12, and FIG. 13 show a part of the cross section in the vicinity of the liquid chamber side diaphragm 260 and the drive side diaphragm 364.
  • FIG. FIG. 11 shows the separated state.
  • 12 and 13 show the mounted state.
  • the drive side diaphragm 364 is indicated by a broken line in order to distinguish it from the liquid chamber side diaphragm 260.
  • the liquid chamber side diaphragm 260 and the driving side diaphragm 364 are illustrated as flat shapes for the sake of simplicity.
  • the actual liquid chamber side diaphragm 260 and the drive side diaphragm 364 are curved as shown in FIGS. 11, 12, and 13.
  • FIGS. 11, 12, and 13 emphasize the bending state of the liquid chamber side diaphragm 260 and the driving side diaphragm 364.
  • the driving side diaphragm 364 has a convex shape in the separated state.
  • the convex shape is a shape bulging outward.
  • the outer side of the driving side diaphragm 364 is the direction toward the opposite side to the piezoelectric element 360. That is, the direction is from the piezoelectric element 360 to the drive side diaphragm 364.
  • the reason why the driving diaphragm 364 has a convex shape in the separated state is that the piezoelectric element 360 is assembled in a preloaded state as described above.
  • the driving side diaphragm 364 has a smooth convex shape in the separated state. This is because the pressure due to the preload acting only on the contact portion with the piston 362 is dispersed around by the rigidity of the drive side diaphragm 364. The reason why the rigidity of the drive side diaphragm 364 is secured is that the drive side diaphragm 364 is made of metal and is formed thicker.
  • the liquid chamber side diaphragm 260 has a convex shape in the separated state.
  • the outside of the liquid chamber side diaphragm 260 is the direction toward the outside of the liquid chamber 240. That is, the direction is from the liquid chamber 240 to the liquid chamber-side diaphragm 260.
  • the reason why the liquid chamber side diaphragm 260 has a convex shape is that the liquid chamber side diaphragm 260 has a convex shape.
  • This molding is performed by press working utilizing the fact that the liquid chamber side diaphragm 260 is made of metal. This press work is performed before welding to the joint portion 250.
  • FIG. 12 shows a state where the volume of the liquid chamber 240 is maximized in the mounted state (hereinafter referred to as “maximum state”). When no voltage is applied to the piezoelectric element 360, the volume of the liquid chamber 240 is maximized.
  • FIG. 13 shows a state where the volume of the liquid chamber 240 is minimized (hereinafter referred to as “minimum state”) in the mounted state.
  • the liquid chamber side diaphragm 260 and the drive side diaphragm 364 come into contact with each other.
  • the drive side diaphragm 364 is supported by the piezoelectric element 360 and thus hardly deforms. Therefore, the drive side diaphragm 364 has substantially the same shape in the separated state (FIG. 11) and the maximum state (FIG. 12).
  • the piezoelectric element 360 In the transition from the maximum state to the minimum state, the piezoelectric element 360 is displaced outward, so that the drive side diaphragm 364 has a convex shape even in the minimum state (FIG. 13).
  • This convex shape is a smooth shape as in the maximum state.
  • the smooth convex shape is obtained because the rigidity of the drive diaphragm 364 is ensured as described above.
  • the liquid chamber side diaphragm 260 is deformed inward so as to follow the shape of the drive side diaphragm 364 in the above contact. As a result, the liquid chamber side diaphragm 260 has a concave shape on the outer side in the maximum state (FIG. 12). When the liquid chamber side diaphragm 260 reaches the minimum state (FIG. 13), it is further deformed inward. Since both concave shapes in the maximum state and the minimum state are shapes along the shape of the drive side diaphragm 364, they are smooth shapes.
  • the liquid chamber side diaphragm 260 receives a force toward the inside in any state, so that a reaction force is always generated to try to expand outward in the mounted state. Moreover, this reaction force is generated as a large force because the liquid chamber side diaphragm 260 is originally convex. The large reaction force causes the liquid chamber side diaphragm 260 to deform following the deformation of the driving side diaphragm 364 when shifting from the minimum state to the maximum state, even if it is not bonded to the driving side diaphragm 364.
  • Modification 1 will be described.
  • a liquid chamber side diaphragm 260a is used instead of the liquid chamber side diaphragm 260 of the embodiment.
  • FIG. 14 shows a part of a cross section in the vicinity of the liquid chamber side diaphragm 260a and the drive side diaphragm 364a in the separated state.
  • the drive side diaphragm 364a has a convex shape in the separated state, like the drive side diaphragm 364 of the embodiment.
  • the liquid chamber side diaphragm 260a has a substantially flat shape in the separated state.
  • liquid chamber side diaphragm 260a is deformed inward so as to follow the shape of the drive side diaphragm 364a in the maximum state. Similarly to the embodiment, the liquid chamber side diaphragm 260a is further deformed inward in the minimum state than in the maximum state.
  • the liquid chamber side diaphragm 260a since the liquid chamber side diaphragm 260a is flat, it is easy to manufacture the liquid chamber side diaphragm 260a. Further, the liquid chamber side diaphragm 260a does not turn over when the piezoelectric element 360 expands and contracts. “Turning over” means that the shape does not return to the original shape while largely deformed inside. When turning inside out, the force to bulge outward decreases. Therefore, the liquid chamber side diaphragm 260 turned upside down deteriorates the followability to the expansion and contraction of the piezoelectric element 360. In the embodiment described above, the expansion / contraction length of the piezoelectric element 360 is designed so that such a situation does not occur, and the followability of the liquid chamber side diaphragm 260 is ensured.
  • the degree of freedom in design is improved, for example, by designing the extension / contraction length of the piezoelectric element 360 to be long.
  • a reaction force is generated on the liquid chamber side diaphragm 260a to swell outward at all times in the mounted state, as in the embodiment. Therefore, similarly to the embodiment, even if the driving side diaphragm 364a is not bonded, the driving side diaphragm 364a is deformed following the deformation of the transition from the minimum state to the maximum state.
  • the reaction force as described above can be generated because the drive side diaphragm 364a has a convex shape, and the liquid chamber side diaphragm 260 is deformed inward when shifting from the separated state to the mounted state.
  • FIG. 15 shows a part of a cross section in the vicinity of the liquid chamber side diaphragm 260b and the drive side diaphragm 364b in the separated state.
  • the liquid chamber side diaphragm 260b has a concave shape in the separated state, unlike the liquid chamber side diaphragm 260 of the embodiment.
  • This concave shape is formed by press working.
  • the driving diaphragm 364b has a convex shape in the separated state, like the driving diaphragm 364 of the embodiment.
  • the drive-side diaphragm 364b has a larger protruding protrusion than the drive-side diaphragm 364 of the embodiment. This is because, in the maximum state, the concave liquid chamber side diaphragm 260b is deformed so as to follow the shape of the drive side diaphragm 364b.
  • the liquid chamber side diaphragm 260b can be prevented from being turned over. Further, in the case of the liquid chamber side diaphragm 260b, even when combined with the drive side diaphragm 364b having a large protrusion in the separated state, the deformation does not become excessive. That is, the compatibility with the drive side diaphragm 364b formed by a large preload is good.
  • the present invention is not limited to the embodiments, examples, and modifications of the present specification, and can be realized with various configurations without departing from the spirit of the present invention.
  • the technical features in the embodiments, examples, and modifications corresponding to the technical features in the embodiments described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the effects described above, replacement or combination can be performed as appropriate. If the technical feature is not described as essential in this specification, it can be deleted as appropriate. For example, the following are exemplified.
  • FIG. 16 is a table showing combinations of shapes of the drive side diaphragm and the liquid chamber side diaphragm. If two diaphragm shapes are classified into three, there are nine combinations. The three classifications are outwardly convex, flat, and outwardly concave.
  • FIG. 16 is an outwardly convex combination, and corresponds to the combination shown in FIG. Similarly, FIG. 16B corresponds to the combination shown in FIG. 14, and FIG. 16C corresponds to the combination shown in FIG.
  • the combinations (a), (b), (c), (d), and (g) may be an outwardly convex combination.
  • the liquid chamber side diaphragm need not be made of metal.
  • it may be made of a resin such as silicone.
  • the drive side diaphragm may not be made of metal.
  • it may be made of a resin such as silicone.
  • the liquid chamber side diaphragm may have the same thickness as the driving side diaphragm or may be thicker than the driving side diaphragm.
  • the piston may be cylindrical. That is, the piston may be formed as a cylinder having a single diameter.
  • the piston may be omitted.
  • the movable plate is constituted only by the driving side diaphragm.
  • the nozzle unit and the actuator unit may be configured integrally. What is integrally configured as described above may be regarded as an actuator unit or a hand piece.
  • the nozzle unit may be used multiple times by sterilization.
  • the liquid to be ejected may be pure water or a chemical solution.
  • the liquid ejecting apparatus may be used other than medical equipment.
  • the liquid ejecting apparatus may be used in a cleaning apparatus that removes dirt with the ejected liquid, or may be used in a drawing apparatus that draws a line or the like with the ejected liquid.
  • a configuration using a piezoelectric element as an actuator is adopted.
  • a configuration in which liquid is ejected using an optical maser, or a configuration in which liquid is pressurized by a pump or the like may be employed.
  • the structure in which the liquid is ejected using the optical maser is a structure in which bubbles are generated in the liquid by irradiating the liquid with the optical maser, and the liquid pressure rise caused by the generation of the bubbles is utilized.
  • the configuration in which the liquid is intermittently ejected is employed, but a configuration having a function of ejecting the liquid continuously may be employed.
  • the structure which can selectively use intermittent injection and continuous injection may be sufficient.
  • only the tube pump may be driven with the driving of the actuator stopped or reduced.
  • intermittent spraying may be performed for excision and continuous spraying may be performed for cleaning.
  • the structure which can implement only continuous injection may be sufficient.
  • the ablation may be performed by continuous injection.
  • Drive part 350a ... Drive part, 351 ... Housing, 351a ... Male thread portion, 353 ... fixed member, 360 ... piezoelectric element, 361 ... movable plate, 362 ... piston, 364 ... drive side diaphragm, 370 ... adhesive containing hard material, 371 ... adhesive, 372 ... Hard material, 400 ... suction tube, 410 ... convex portion, 460 ... synthetic diaphragm, 500 ... suction force adjusting mechanism, 522 ... hole.

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Abstract

Dans une configuration où une unité de buse qui est pourvue d'une chambre à liquide et une unité d'actionneur qui est pourvue d'un élément piézo-électrique peuvent être attachées et retirées, la relation entre le diaphragme côté chambre à liquide prévu dans l'unité de buse et un diaphragme côté entraînement prévu dans l'unité d'actionneur est rendue appropriée. Dans un état ou une unité de buse pour un dispositif à jet de liquide et une unité d'actionneur pour le dispositif à jet de liquide sont séparées l'une de l'autre, la condition où le diaphragme côté chambre à liquide a une forme faisant saillie vers l'extérieur de la chambre à liquide et/ou la condition où le diaphragme côté entraînement a une forme faisant saillie vers le côté opposé à l'élément piézo-électrique sont satisfaites.
PCT/JP2016/000702 2015-03-23 2016-02-10 Unité de buse pour dispositif à jet de liquide, unité d'actionneur pour dispositif à jet de liquide, et pièce à main pour dispositif à jet de liquide WO2016151998A1 (fr)

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JP2015059274A JP2016174867A (ja) 2015-03-23 2015-03-23 液体噴射装置用ノズルユニット、液体噴射装置用アクチュエーターユニット、液体噴射装置用ハンドピース
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09300610A (ja) * 1996-05-13 1997-11-25 Citizen Watch Co Ltd インクジェット記録ヘッド
WO2006080566A1 (fr) * 2005-01-26 2006-08-03 Matsushita Electric Works, Ltd. Pompe a membrane piezoelectrique
JP2010059902A (ja) * 2008-09-05 2010-03-18 Seiko Epson Corp 圧電素子ユニット、ノズルユニット、流体噴射装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09300610A (ja) * 1996-05-13 1997-11-25 Citizen Watch Co Ltd インクジェット記録ヘッド
WO2006080566A1 (fr) * 2005-01-26 2006-08-03 Matsushita Electric Works, Ltd. Pompe a membrane piezoelectrique
JP2010059902A (ja) * 2008-09-05 2010-03-18 Seiko Epson Corp 圧電素子ユニット、ノズルユニット、流体噴射装置

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