JP6649092B2 - Fluid discharge unit - Google Patents

Description

  The present invention relates to a fluid discharge unit that moves a movable plate to discharge a fluid in a pressurized chamber from a discharge port.

  2. Description of the Related Art Conventionally, there has been known a fluid discharge unit that moves a movable plate (vibrating plate) to discharge a fluid in a pressurized chamber from a discharge port (for example, see Patent Document 1). The fluid discharge unit (speaker-type vibrator for an air gun) described in Patent Literature 1 includes a coil bobbin to which a diaphragm is fixed, a frame that movably holds the coil bobbin, and a bellows-shaped damper that connects the coil bobbin to the frame. , A cylindrical shaft inserted inside the coil bobbin, a magnet arranged on the outer peripheral side of the shaft, and plates fixed to upper and lower end surfaces of the magnet.

  In the fluid discharge unit (speaker type vibrator for air cannon) described in Patent Document 1, a chamber (pressurized chamber) is formed in front of the diaphragm, and a discharge port is formed in the center of the upper surface of the chamber. The diaphragm vibrates with respect to the upper surface of the chamber in which the discharge port is formed, and a vortex-shaped airflow is discharged from the discharge port.

JP 2014-129891 A

  In a fluid discharge unit, it has been proposed that a drive mechanism (a coil bobbin, a magnet, or the like) disposed on the side opposite to the pressurizing chamber with respect to the movable plate is protected by a cover. However, when the movable plate vibrates, the fluid moves behind the movable plate. Therefore, if the rear of the movable plate is closed by the cover, the vibration of the movable plate is hindered by the negative pressure. As a result, there is a problem that the momentum of the fluid discharged from the fluid discharge unit is reduced.

  In view of the above problems, it is an object of the present invention to suppress a decrease in the force of a fluid discharged from a fluid discharge unit by a cover that covers a rear side of the fluid discharge unit.

In order to solve the above problems, the present invention is a fluid discharge unit that moves a movable plate to discharge a fluid in a pressurized chamber from a discharge port, and a movable body that linearly moves the movable plate; A fixed body that movably holds the movable body, a support member that connects the movable body and the fixed body, a coil provided on the movable body, and the fixed body that is arranged to surround the coil. A drive mechanism including a magnet, a pressurizing chamber forming member having the discharge port formed therein and partitioning the pressurizing chamber together with the movable plate and the support member, and disposed on a side opposite to the pressurizing chamber with respect to the movable plate. And a cover member that covers the drive mechanism. The cover member includes a cover member, the movable plate, and a cover member for discharging a fluid in a drive mechanism protection chamber surrounded by the support member to the outside. Drive mechanism protection Discharge port is formed, the drive mechanism protective chamber outlet, said opening area than discharge port is rather large, the cover member includes a cylindrical portion surrounding the outer periphery of the driving mechanism, the cylindrical portion An inclined portion whose diameter is reduced from a side where the pressurizing chamber is located to a side opposite to the pressurized chamber, wherein the drive mechanism protection chamber discharge port is formed in the inclined portion. I do.

According to the present invention, the cover member that covers the drive mechanism is disposed on the back side (the side opposite to the pressurizing chamber) of the fluid discharge unit. Therefore, the drive mechanism can be protected by the cover member, and the dustproof function and the mischief prevention function can be enhanced. Further, the distance between the drive mechanism and the surrounding structure can be maintained, so that the magnetic-shielding function can be enhanced. Furthermore, since the cover member has an opening (drive mechanism protection chamber discharge port) larger than the discharge port, when the movable plate vibrates, the drive mechanism protection chamber is surrounded by the cover member, the movable plate, and the support member. Can be discharged to the outside. Therefore, when the movable plate is driven, the vibration of the movable plate can be prevented from being hindered, and the provision of the cover member can suppress the decrease in the force of the fluid discharged from the fluid discharge unit.

According to the present invention, the cover member includes a tubular portion surrounding the outer peripheral side of the drive mechanism, and the tubular portion faces from the side where the pressurizing chamber is located to a side opposite to the pressurizing chamber. an inclined portion for diameter reduced accordingly the drive mechanism protective chamber outlet, so it is formed in the inclined portion, the cover member in molding a plastic or the like, a driving mechanism protective chamber outlet only upper and lower mold The cover member provided can be formed.

According to another aspect of the present invention, there is provided a fluid discharge unit that moves a movable plate to discharge a fluid in a pressurized chamber from a discharge port, wherein the movable plate linearly moves the movable plate. A fixed body that movably holds the movable body, a support member that connects the movable body to the fixed body, a coil provided in the movable body, and a fixed body that surrounds the coil.
A driving mechanism including a magnet to be formed, a pressurizing chamber forming member that forms the discharge port and partitions the pressurizing chamber together with the movable plate and the support member, and a side opposite to the pressurizing chamber with respect to the movable plate. And a cover member that covers the drive mechanism, wherein the cover member discharges fluid in a drive mechanism protection chamber surrounded by the cover member, the movable plate, and the support member to the outside. A drive mechanism protection chamber discharge port is formed, the drive mechanism protection chamber discharge port has an opening area larger than the discharge port, and the fixed body includes a frame that supports the support member, and the frame includes: A plurality of pillar portions are provided on an inner peripheral side of the cover member, and at least a part of the pillar portion faces the drive mechanism protection chamber discharge port . With this configuration, it is possible to prevent dust from entering the drive mechanism protection chamber from the drive mechanism protection chamber discharge port. Therefore, it is possible to suppress a reduction in the dustproof function due to the formation of the drive mechanism protection chamber discharge port.

ADVANTAGE OF THE INVENTION According to this invention, a drive mechanism can be protected by a cover member and a dust-proof function, a mischief prevention function, and a magnetic-shielding function can be improved. In addition, the provision of the cover member can suppress a decrease in the momentum of the fluid discharged from the fluid discharge unit. Further, when the cover member is formed of plastic or the like, the cover member having the drive mechanism protection chamber discharge port can be formed using only the upper and lower molds. Alternatively, it is possible to prevent dust from entering the drive mechanism protection chamber from the drive mechanism protection chamber discharge port. Therefore, it is possible to suppress a reduction in the dustproof function due to the formation of the drive mechanism protection chamber discharge port.

It is a perspective view of a fluid discharge unit to which the present invention is applied. It is a longitudinal cross-sectional view of the fluid discharge unit shown in FIG. FIG. 2 is an exploded perspective view of the fluid discharge unit shown in FIG. FIG. 4 is an exploded perspective view of a pressure chamber forming member and a protection member. It is a perspective view of a cover member.

  Hereinafter, embodiments of a fluid discharge unit to which the present invention is applied will be described with reference to the drawings.

(overall structure)
FIG. 1 is a perspective view of a fluid discharge unit 1 to which the present invention is applied. FIG. 1A is a perspective view seen from above, and FIG. 1B is a perspective view seen from below. FIG. 2 is a longitudinal sectional view of the fluid discharge unit 1 shown in FIG. FIG. 3 is an exploded perspective view of the fluid discharge unit 1 shown in FIG. The fluid discharge unit 1 moves the movable plate 2 to discharge the fluid in the pressurizing chamber 3 from the discharge port 4a. The fluid discharge unit 1 is used, for example, mounted on an automobile, and discharges air in a lump toward the driver in order to wake the driver. The fluid discharge unit is mounted on an amusement device, and discharges air to the player in a lump state in order to enhance the effect. Alternatively, the fluid discharge unit 1 is disposed in a movie theater, and discharges air in a lump toward the viewer in order to enhance a staging effect. Note that the fluid discharge unit 1 may discharge a gas other than air or may discharge a liquid. Further, the fluid discharge unit 1 may discharge a gas containing a liquid.

  The fluid discharge unit 1 includes a pressurizing chamber forming member 4 in which a discharge port 4a is formed, a protection member 5 disposed in the pressurizing chamber 3, a movable body 6 for linearly moving the movable plate 2, and a movable body. 6, a support member 8 connecting the movable body 6 and the fixed body 7, a damper member 9 disposed between the movable body 6 and the fixed body 7, and a fluid discharging unit 1. Is provided with a cover member 10 that covers the rear side. In this specification, the moving direction of the movable plate 2 (the Z direction in FIGS. 1 to 3) is defined as a vertical direction. In the moving direction of the movable plate 2, the air release side (Z1 direction side in FIGS. 1 to 3) is set to the upper side, and the opposite side (Z2 direction side in FIGS. 1 to 3) is set to the lower side. .

(Movable plate)
The movable plate 2 is a circular rigid body when viewed in the vertical direction Z, and is formed of a resin film or the like. The movable plate 2 of the present embodiment has a curved plate shape in which the upper surface side is depressed (that is, swells toward the lower side Z2). In addition, the movable plate 2 may have a curved plate shape in which the lower surface side is depressed (that is, expand toward the upper side Z1), or may have a flat plate shape.

(Pressure chamber forming member and protective member)
The pressurizing chamber forming member 4 includes a cylindrical portion 41 whose lower end is open, and an overhang 42 projecting outward from the cylindrical portion 41. The overhang portions 42 are formed at four locations at equal angular intervals in the circumferential direction. The four projecting portions 42 are arranged so as to have a substantially square outer shape as a whole when viewed in the vertical direction Z. As shown in FIG. 2, a pressurizing chamber 3 is formed between the movable plate 2 and the inside of the cylindrical portion 41. A protective member 5 is disposed in the pressurizing chamber 3. The protection member 5 is a flat net-like member. For example, a plain-woven net-like member in which a metal wire is crossed vertically and horizontally is used as the protection member 5. In this embodiment, a net-like member in which SUS wires (0.25 mm in diameter) are arranged vertically and horizontally at 1 mm intervals is used as the protection member 5.

  FIG. 4 is an exploded perspective view of the pressure chamber forming member and the protection member as viewed from below Z2. The cylindrical portion 41 of the pressurizing chamber forming member 4 includes a disk-shaped end plate portion 43 and a cylindrical portion 44 extending from the outer peripheral edge of the end plate portion 43 to the lower side Z2. The end plate 43 faces the movable plate 2. The discharge port 4a is a circular opening penetrating the center of the end plate 43. When viewed in the vertical direction Z, the center of the discharge port 4a and the center of the movable plate 2 coincide. The protection member 5 is a planar member larger than the opening diameter of the discharge port 4a, and faces the discharge port 4a. As shown in FIG. 2, the protection member 5 is disposed at a position where a predetermined gap is formed between the protection member 5 and the discharge port 4a. Further, the protection member 5 is disposed above the movable range of the movable plate 2 in the upper side Z1.

  The inner peripheral surface 4b of the pressurizing chamber forming member 4 is a cylindrical surface. That is, the shape of the inner peripheral surface 4b when viewed from above and below is circular. Also, when viewed from above and below, the center of the discharge port 4a coincides with the center of the inner peripheral surface 4b. At a position slightly above the center of the inner peripheral surface 4b in the vertical direction Z, a step surface 4c facing the lower side Z2 is formed. As shown in FIG. 2, the outer peripheral edge of the protection member 5 is sandwiched between the ring-shaped member 45 arranged on the lower side Z2 of the step surface 4c and the step surface 4c. The outer peripheral edges of the ring-shaped member 45 and the protection member 5 are fixed to the cylindrical portion 44 of the pressurizing chamber forming member 4 by an adhesive over the entire circumference.

(Movable body)
The movable body 6 includes a cylindrical bobbin 61 whose axial direction is the vertical direction Z, and a driving coil 62 wound around the outer peripheral surface of the bobbin 61. The bobbin 61 is formed of an insulating material such as an insulating resin material. The movable plate 2 is attached to the upper end side of the bobbin 61 via a movable-side fixed portion 8a, which will be described later, forming the support member 8.

The drive coil 62 is fixed to the outer peripheral surface of the bobbin 61. The end of the driving coil 62 is connected to an FFC (Flexible Flat Cable) or an FPC (Flexible Flat Cable).
Printed Circuits) is connected to one end of a cable (not shown). The other end of the cable is connected to a board (not shown) fixed to the fixed body 7 or the like. The cable to which the end of the driving coil 62 is connected may be a lead wire.

(Fixed body)
The fixed body 7 includes a cylindrical driving magnet 71 whose axial direction is the vertical direction Z. The driving magnet 71 has a thick cylindrical shape, and its inner diameter is larger than the outer diameter of the bobbin 61. The driving magnet 71 is magnetized such that the magnetic pole on the upper end face and the magnetic pole on the lower end face are different. For example, the driving magnet 71 is magnetized such that the magnetic pole on the upper end surface side is N and the magnetic pole on the lower end surface side is S. The fixed body 7 includes a cylindrical shaft 72 inserted into the inner peripheral side of the bobbin 61, a disk-shaped fixed plate 73 fixed to the lower end surface of the driving magnet 71, and A disk-shaped fixing plate 74 fixed to the end face and a frame 75 to which the pressurizing chamber forming member 4 is fixed are provided. The driving magnet 71, the shaft 72, the fixed plate 73, the fixed plate 74, and the frame 75 are coaxially arranged.

  The fixing plates 73 and 74 are formed of a soft magnetic material. The fixed plate 73 is fixed to the lower end surface of the driving magnet 71, and the fixed plate 74 is fixed to the upper end surface of the driving magnet 71. At the center of the fixing plate 73, a circular through hole 73a for fixing the shaft 72 is formed. At the center of the fixing plate 74, a round hole-shaped through hole 74a for disposing the bobbin 61 and the like is formed.

  The shaft 72 is formed of a soft magnetic material. The shaft 72 has a columnar shape and is arranged on the inner peripheral side of the driving magnet 71. At the lower end of the shaft 72, a fixed portion 72a protruding toward the lower side Z2 is formed. The fixed portion 72 a has a columnar shape slightly thinner than the other portion of the shaft 72, and is inserted and fixed in the through hole 73 a of the fixing plate 73. The length of the shaft 72 (the length in the vertical direction Z) excluding the portion to be fixed 72 a is substantially equal to the total dimension of the length in the vertical direction Z of the driving magnet 71 and the thickness of the fixing plate 74.

  The frame 75 includes a substantially annular bottom portion 75a, a large-diameter portion 75b rising from the outer peripheral edge of the bottom portion 75a to the upper side Z1 in a stepwise manner, and a flange portion extending radially outward from the upper end of the large-diameter portion 75b. 75c and a cylindrical portion 75d extending from the edge of the center hole of the bottom portion 75a to the lower side Z2. In the frame 75, air vent windows 75e penetrating the enlarged diameter portion 75b in the radial direction are formed at four locations at equal angular intervals in the circumferential direction. The region between the adjacent windows 75e in the enlarged diameter portion 75b is a support 75f connecting the bottom 75a and the flange 75c. The support portions 75f are arranged at four positions at equal angular intervals in the circumferential direction.

  The frame 75 is fixed to the fixing plate 74 with the cylindrical portion 75d of the frame 75 inscribed in the through hole 74a of the fixing plate 74 and the bottom 75a of the frame 75 in contact with the upper surface of the fixing plate 74. The length of the cylindrical portion 75d in the vertical direction Z is substantially equal to the thickness of the fixing plate 74. The bobbin 61 around which the driving coil 62 is wound is disposed on the inner peripheral side of the cylindrical portion 75d. There is a gap between the driving coil 62 and the inner peripheral surface of the cylindrical portion 75d. The length of the bobbin 61 in the vertical direction Z is longer than the thickness of the fixing plate 74. The length of the winding area of the driving coil 62 in the up-down direction Z is also longer than the thickness of the fixing plate 74.

The outer shape of the flange 75c when viewed from the up-down direction Z is substantially square. The flange portion 75c contacts the lower end surfaces of the cylindrical portion 44 and the overhang portion 42 of the pressurizing chamber forming member 4 from below Z2. The cover member 10 that covers the back side of the fluid discharge unit 1 includes a flange portion 11 formed at a position overlapping the overhang portion 42 and the flange portion 75c in the vertical direction Z, as described later. The flange 11 contacts the flange 75c from below Z2. The overhang portion 42, the flange portion 75c, and the flange portion 11 are fixed by being screwed from below Z2 with screws (not shown). That is, the pressurizing chamber forming member 4 and the cover member 10 are fixed by screws (not shown), and the fixed body 7 is fixed to the pressurizing chamber forming member 4 and the cover member 10 via the frame 75.

(Support member)
The support member 8 that connects the movable body 6 and the fixed body 7 includes an annular movable-side fixed section 8a to which the movable plate 2 and the bobbin 61 are fixed, and an annular fixed-side fixed section 8b that is fixed to the fixed body 7. And an annular turn-back portion 8c connecting the movable-side fixed portion 8a and the fixed-side fixed portion 8b. The fixed-side fixing portion 8 b is provided at an outer peripheral end of the support member 8. The folded portion 8c is arranged on the inner peripheral side of the fixed side fixed portion 8b, and is folded back once so as to swell to the upper side Z1. As shown in FIG. 2, when a current is not supplied to the driving coil 62, the shape of the vertical section of the folded portion 8 c is substantially semicircular.

  The fixed-side fixed portion 8b and the folded portion 8c are formed integrally, and the movable-side fixed portion 8a formed separately is fixed to the folded portion 8c by bonding or the like. The fixed side fixed portion 8b and the folded portion 8c are formed of an elastic material such as rubber, resin, or compressed sponge. On the other hand, the movable-side fixed portion 8a is a rigid body formed of paper, resin, or the like.

  The movable-side fixed portion 8a has a substantially conical shape whose diameter increases toward the upper side Z1. An upper end portion of the bobbin 61 is fixed to an inner peripheral edge of the movable side fixed portion 8a. The outer peripheral end portion of the movable plate 2 is fixed to the outer peripheral end portion of the movable side fixed portion 8a. The fixed side fixing portion 8b is fixed to the upper surface of the flange 75c of the frame 75.

(Damper member)
The damper member 9 is annular and has a movable body-side fixed portion 9a fixed to the bobbin 61, a fixed body-side fixed portion 9b fixed to the frame 75, and a bellows-like shape connecting the movable body-side fixed portion 9a and the fixed body-side fixed portion 9b. The spring portion 9c is provided. The fixed body-side fixed portion 9b is fixed to the stepped surface of the enlarged-diameter portion 75b by abutting from the upper side Z1. The damper member 9 positions the bobbin 61 in a direction crossing the vertical direction Z. The position of the bobbin 61 in the vertical direction Z when no current is supplied to the driving coil 62 is defined by the damper member 9.

(Operation of the fluid discharge unit 1)
On the upper side Z <b> 1 of the movable plate 2, the pressure chamber 3 partitioned by the movable plate 2, the pressure chamber forming member 4, the support member 8, and the flange 75 c of the frame 75 is arranged. The pressurizing chamber 3 is a space that applies pressure to air (compresses air). In this embodiment, the shaft 72 and the fixed plates 73 and 74 formed of a soft magnetic material move from the upper end surface of the driving magnet 71 to the lower end surface (or from the lower end surface of the driving magnet 71 to the upper end surface). A magnetic path is formed around which the magnetic field lines wrap. The magnetic path passes through the drive coil 62 between the upper end portion of the outer peripheral surface of the shaft 72 and the inner peripheral surface of the fixed plate 74 (that is, the side surface of the through hole 74a). A magnetic gap is formed between the upper end portion of the fixing plate 74 and the inner peripheral surface of the fixing plate 74. As described above, the shaft 72 is inserted on the inner peripheral side of the bobbin 61 such that a magnetic path passing through the driving coil 62 is formed by the magnetic force generated by the driving magnet 71.

The fluid discharge unit 1 includes a drive mechanism 1A that moves the movable plate 2 in the vertical direction Z. The driving mechanism 1A includes a driving coil 62 wound around a bobbin 61 disposed on the movable body 6, a driving magnet 71 disposed on the fixed body 7, and a driving magnet 71 formed of a soft magnetic material. A shaft 72 inserted into the inner peripheral side of the bobbin 61 so that a magnetic path passing through the driving coil 62 is formed by the magnetic force generated by the shaft member, and a damper member 9 connecting the movable body 6 and the fixed body 7. Prepare.

  In the present embodiment, the inner diameter of the bobbin 61 is larger than the outer diameter of the shaft 72, and a gap is formed between the bobbin 61 and the shaft 72 so that the bobbin 61 does not contact the shaft 72. The positioning of the bobbin 61 with respect to the shaft 72 is performed by the damper member 9.

  The fluid discharge unit 1 drives the drive mechanism 1A by supplying a pulsed current to the drive coil 62. When one pulse of current is supplied, the movable body 6 (bobbin 61 and driving coil 62) makes one reciprocation in the vertical direction Z due to the Lorentz force that the current receives from the magnetic field. At this time, the movable plate 2 also makes one reciprocation in the vertical direction Z. The movable plate 2 is pulled to the lower side Z2, and then compresses the air in the pressurizing chamber 3 when jumping out to the upper side Z1. As a result, the air in the pressurized chamber 3 is discharged from the discharge port 4a. Since the air discharged from the discharge port 4a entrains the air outside the discharge port 4a, the swirl-shaped airflow jumps out to the upper side Z1 of the discharge port 4a. By continuously supplying a pulsed current, an air current can be generated from the discharge port 4a.

(Cover member)
5 is a perspective view of the cover member 10, FIG. 5 (a) is a perspective view as viewed from above, and FIG. 5 (b) is a perspective view as viewed from below. The cover member 10 is disposed on the opposite side (lower side Z2) of the movable plate 2 from the pressurizing chamber 3. The cover member 10 has a shape that covers the outer peripheral side and the lower side Z2 of the drive mechanism 1A, and is open to the upper side Z1. A drive mechanism protection chamber 10 </ b> A is formed inside the cover member 10. The drive mechanism protection chamber 10A is a space surrounded by the cover member 10, the movable plate 2, and the support member 8. The drive mechanism 1A is disposed in the drive mechanism protection chamber 10A. In this embodiment, as shown in FIG. 2, most of the movable body 6 and the fixed body 7 are housed in the drive mechanism protection chamber 10 </ b> A, but the support member 8 that connects the movable body 6 and the fixed body 7, and The flange 75c of the frame 75 is located above the drive mechanism protection chamber 10A.

  As described above, the upper end of the cover member 10 is formed with the flange portion 11 that overlaps with the overhang portion 42 of the pressurizing chamber forming member 4 and the flange portion 75c of the frame 75 in the vertical direction Z. The cover member 10 includes a tubular portion 12 that opens to the upper side Z1 and an end plate portion 13 that closes the bottom of the tubular portion 12, and the flange portion 11 projects radially at the upper end of the tubular portion 12. As shown in FIG. 5B, the end plate 13 has a curved opening 14 extending in the circumferential direction.

  The cylindrical portion 12 includes a large-diameter cylindrical portion 15 provided with the flange portion 11, a small-diameter cylindrical portion 16 connected to the end plate portion 13, an upper end of the small-diameter cylindrical portion 16, and a lower end of the large-diameter cylindrical portion 15. And an inclined portion 17 that connects The cylindrical portion 12 has a substantially cylindrical shape as a whole, and has a shape in which the diameter is reduced at a portion where the inclined portion 17 is provided. The tubular portion 12 is located on the outer peripheral side of the drive mechanism 1A disposed in the drive mechanism protection chamber 10A, and forms a side surface of the cover member 10. A drive mechanism protection chamber discharge port 18 that penetrates the inclined part 17 in the radial direction is formed in the cylindrical part 12 at four locations at equal angular intervals in the circumferential direction. As for the opening area of the drive mechanism protection chamber discharge port 18, it is desirable that the total opening area of the four locations is at least larger than the opening area of the discharge port 4a. More than three times. The number, shape, and arrangement of the drive mechanism protection chamber discharge ports 18 are not limited to the embodiment. For example, the number of the discharge ports 4a may be one or more, and the opening area of each one of the drive mechanism protection chamber discharge ports 18 may be larger than the opening area of the discharge port 4a. The arrangement of the drive mechanism protection chamber discharge ports 18 may not be uniform in the circumferential direction.

  The drive mechanism protection chamber discharge port 18 is a substantially rectangular opening, and includes an upper opening end face 18a and a lower opening end face 18b extending linearly. When viewed from the vertical direction Z, the drive mechanism protection chamber discharge port 18 is displaced in the radial direction without any overlap between the upper open end face 18a and the lower open end face 18b. In this embodiment, the upper opening end face 18a is formed by forming the drive mechanism protection chamber discharge port 18 in the inclined portion 17 and setting the opening width in the vertical direction Z of the drive mechanism protection chamber discharge port 18 to a predetermined size or more. And the lower opening end face 18b does not overlap when viewed in the vertical direction Z.

  As shown in FIG. 3, the drive mechanism protection chamber discharge port 18 is displaced in the circumferential direction by 45 degrees with respect to a window 75e formed in the frame 75, and is disposed between the adjacent windows 75e. The portion 75f is at the same angular position as the drive mechanism protection chamber discharge port 18. As shown in FIG. 2, when the frame 75 is assembled on the inner peripheral side of the cover member 10, the column 75f of the frame 75 is located in front of the drive mechanism protection chamber discharge port 18, and the column 75f and the drive mechanism protection chamber are arranged. The discharge port 18 faces the radial direction. Accordingly, the support 75 </ b> F prevents dust and foreign matter from entering the drive mechanism protection chamber discharge opening 18.

(Effects)
As described above, in the fluid discharge unit 1 of the present embodiment, the protection member 5 having a diameter larger than the opening diameter of the discharge port 4a is provided inside the pressurized chamber 3 in which the discharge port 4a for discharging the fluid is formed. They are arranged facing each other. Therefore, foreign matter can be prevented from entering the movable plate 2 by the protection member 5, and damage to the movable plate 2 due to the foreign matter can be suppressed. Further, since the protection member 5 is disposed inside the pressurizing chamber 3, there is little possibility that the protection member 5 prevents the fluid discharged from the discharge port 4a from entraining the fluid around the discharge port 4a. Therefore, it is possible to prevent the momentum of the fluid discharged from the fluid discharge unit 1 from being reduced by the protection member 5.

  In this embodiment, since the protection member 5 is arranged so as to secure a predetermined gap between the protection member 5 and the discharge port 4a, there is a possibility that the protection member 5 lowers the momentum of the fluid discharged from the discharge port 4a. Few. Therefore, it is possible to prevent the momentum of the fluid discharged from the fluid discharge unit 1 from being reduced by the protection member 5. Further, since the protection member 5 is a mesh member having a high aperture ratio, the protection member 5 does not significantly hinder the movement of the fluid in the pressurizing chamber 3. Also from this point, there is little possibility that the protection member 5 lowers the momentum of the fluid discharged from the discharge port 4a.

  Here, as the protective member 5, it is desirable to use a material having a high aperture ratio, but it is not limited to the mesh member as described above. For example, it may be a member in which wires are arranged at a constant pitch without intersecting, or a member in which corrugated linear members are arranged at a constant pitch. Further, a member in which many openings are provided in a planar member may be used.

  In the present embodiment, the pressurizing chamber 3 is vertically divided by the planar protective member 5. Therefore, the protection member 5 can prevent foreign matter from entering the movable plate 2.

  The drive mechanism 1A of the present embodiment is formed of a driving coil 62 wound around a bobbin 61 disposed on the movable body 6, a driving magnet 71 disposed on the fixed body 7, and a soft magnetic material. A shaft 72 inserted on the inner peripheral side of the bobbin 61 so that a magnetic path passing through the driving coil 62 is formed by a magnetic force generated by the magnet, and a damper member 9 connecting the movable body 6 and the fixed body 7. This is a linear drive mechanism having a voice coil structure. Therefore, it is possible to discharge a fluid having an impact while being small.

Further, in the present embodiment, since the cover member 10 that covers the drive mechanism 1A is disposed on the back side of the fluid discharge unit 1 (the side opposite to the pressurizing chamber 3), the drive mechanism 1A can be protected by the cover member 10. In addition, the dust prevention function and the mischief prevention function can be enhanced. Further, since the distance between the driving mechanism 1A and the surrounding structure can be maintained, the magnetic-shielding function can be enhanced. Further, since the cover member 10 is formed with an opening (the drive mechanism protection chamber discharge port 18) larger than the discharge port 4a, the cover member 10, the movable plate 2, and the support member 8 when the movable plate 2 vibrates. The fluid in the drive mechanism protection chamber 10 </ b> A, which is surrounded by, can be discharged outside. Therefore, when the movable plate 2 is driven, the vibration of the movable plate 2 can be prevented from being hindered, and the provision of the cover member 10 can suppress the decrease in the force of the fluid discharged from the fluid discharge unit 1.

  The cover member 10 of the present embodiment includes a side surface (cylindrical portion 12) located on the outer peripheral side of the drive mechanism 1A, and a drive mechanism protection chamber discharge port 18 is formed on the side surface (cylindrical portion 12). A drive mechanism protection chamber discharge port 18 is provided at a portion closer to the movable plate 2 than the bottom surface (end plate portion 13) of the drive mechanism 10. Therefore, there is little possibility that the momentum of the fluid flowing in and out of the drive mechanism protection chamber discharge port 18 is reduced. Further, when discharging the fluid from the bottom surface (end plate portion 13), it is necessary to secure a wide fluid passage by increasing the distance between the drive mechanism 1A and the side surface (cylindrical portion 12) of the cover member 10. In addition, this embodiment does not need to provide such a fluid passage, which is advantageous for miniaturization.

  In the cover member 10 of the present embodiment, the cylindrical portion 12 surrounding the outer peripheral side of the drive mechanism 1A is provided with an inclined portion 17, and a drive mechanism protection chamber discharge port 18 is formed in the inclined portion 17. With such a configuration, when viewed from the vertical direction Z, the drive mechanism protection chamber discharge port 18 has a shape in which the upper opening end face 18a and the lower opening end face 18b are displaced in the radial direction without overlapping at all. ing. Therefore, when the cover member 10 is formed of plastic or the like, the cover member 10 having the drive mechanism protection chamber discharge port 18 can be formed only by the upper and lower molds. Therefore, the cover member 10 can be easily manufactured, and the manufacturing cost can be reduced.

  In the cover member 10 of the present embodiment, the support portion 75f of the frame 75 located on the inner peripheral side of the cover member 10 and the drive mechanism protection chamber discharge port 18 face each other. Therefore, it is possible to prevent dust from entering the drive mechanism protection chamber 10A from the drive mechanism protection chamber discharge port 18. Therefore, a reduction in the dustproof function due to the formation of the drive mechanism protection chamber discharge port 18 can be suppressed. It is sufficient that at least a part of the support 75 f faces the drive mechanism protection chamber discharge port 18.

DESCRIPTION OF SYMBOLS 1 ... Fluid discharge unit, 1A ... Drive mechanism, 2 ... Movable plate, 3 ... Pressurized chamber, 4 ... Pressurized chamber forming member, 4a ... Discharge port, 4b ... Inner peripheral surface, 4c ... Stepped surface, 5 ... Protective member , 6 movable body, 7 fixed body, 8 support member, 8a movable side fixed part, 8b fixed side fixed part, 8c folded part, 9 damper member, 9a movable body side fixed part, 9b fixed Body side fixing portion, 9c: spring portion, 10: cover member, 10A: drive mechanism protection chamber, 11: flange portion, 12: cylindrical portion, 13: end plate portion, 14: opening portion, 15: large diameter cylindrical portion , 16 ... small-diameter cylindrical part, 17 ... inclined part, 18 ... drive mechanism protection chamber discharge port, 18a ... upper opening end face, 18b ... lower opening end face, 41 ... cylindrical part, 42 ... projecting part, 43 ... end plate part , 44, 44A ... cylindrical part, 45 ... ring-shaped member, 61 ... bobbin, 62 ... drive coil, 71 ... drive magnet 72: shaft, 72a: fixed portion, 73: fixed plate, 73a: through hole, 74: fixed plate, 74a: through hole, 75: frame, 75a: bottom portion, 75b: enlarged diameter portion, 75c: flange portion, 75d ... Cylinder part, 75e ... Window part, 75f ... Post part, Z ... Vertical direction, Z1 ... Top, Z2 ... Bottom

Claims (2)

A fluid discharge unit that moves a movable plate to discharge a fluid in a pressurized chamber from a discharge port,
A movable body that linearly moves the movable plate,
A fixed body that movably holds the movable body,
A support member that connects the movable body and the fixed body,
A coil provided on the movable body, and a drive mechanism including a magnet arranged on the fixed body so as to surround the coil;
A pressurizing chamber forming member in which the discharge port is formed and partitions the pressurizing chamber together with the movable plate and the support member;
A cover member disposed on the opposite side of the pressurizing chamber with respect to the movable plate, and covering the driving mechanism,
In the cover member, a drive mechanism protection chamber discharge port for discharging the fluid in the drive mechanism protection chamber surrounded by the cover member, the movable plate, and the support member to the outside is formed,
The drive mechanism protective chamber outlet is much larger opening area than the outlet,
The cover member includes a tubular portion surrounding an outer peripheral side of the driving mechanism,
The cylindrical portion includes an inclined portion whose diameter is reduced from a side where the pressurizing chamber is located toward a side opposite to the pressurizing chamber,
The drive mechanism protection chamber discharge port is formed in the inclined portion . A fluid discharge unit that moves a movable plate to discharge a fluid in a pressurized chamber from a discharge port,
A movable body that linearly moves the movable plate,
A fixed body that movably holds the movable body,
A support member that connects the movable body and the fixed body,
A coil provided on the movable body, and a drive mechanism including a magnet arranged on the fixed body so as to surround the coil;
A pressurizing chamber forming member in which the discharge port is formed and partitions the pressurizing chamber together with the movable plate and the support member;
A cover member disposed on the opposite side of the pressurizing chamber with respect to the movable plate, and covering the driving mechanism,
The cover member is surrounded by the cover member, the movable plate, and the support member.
A drive mechanism protection chamber discharge port for discharging the fluid of the drive mechanism protection chamber to the outside is formed,
The drive mechanism protection chamber discharge port has a larger opening area than the discharge port,
The fixed body includes a frame that supports the support member,
The frame includes a plurality of pillars located on the inner peripheral side of the cover member,
A fluid discharge unit, wherein at least a part of the support portion faces the drive mechanism protection chamber discharge port .

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