JP2019031925A - pump - Google Patents

Abstract

To provide a pump capable of suppressing occurrence of tapping sound.SOLUTION: A pump comprises a gas chamber, a movable wall, a vent hole and valve body. The gas chamber is formed into a cylindrical shape and partitioned by a partition wall. The movable wall rotationally reciprocates in the gas chamber. The vent hole is provided between the movable wall and the partition wall in the gas chamber, and connects the inside of the gas chamber to the outside. The valve body projects from the movable wall, moves to the partition wall side in a state where the movable wall delivers fluid in the gas chamber, and closes the vent hole in front of a predetermined distance of contacting with the partition wall.SELECTED DRAWING: Figure 1B

Description

  The present invention relates to a pump.

  2. Description of the Related Art Conventionally, a camera that is mounted on a vehicle and images the periphery of the vehicle is known. An image captured by such a camera is displayed on a monitor, for example, for assisting a driver's field of view, or used for sensing to detect a white line on a road, an object approaching a vehicle, or the like.

  For example, raindrops or other deposits may adhere to the lens of such a camera, which may hinder the above-mentioned visual assistance or sensing. Therefore, in recent years, there has been proposed a deposit removing device that removes deposits by jetting compressed air generated by a pump toward a lens (see, for example, Patent Document 1).

JP 2014-037239 A

  However, in the conventional technology, in a pump, for example, when adopting a structure in which a piston is reciprocated in a cylinder to generate compressed air, the piston and the cylinder collide vigorously due to the reciprocating motion, and a hitting sound is generated. There was a risk of occurrence.

  This invention is made | formed in view of the above, Comprising: It aims at providing the pump which can suppress generation | occurrence | production of a hitting sound.

  In order to solve the above-described problems and achieve the object, a pump according to the present invention includes an air chamber, a movable wall, a vent hole, and a valve body. The air chamber has a cylindrical shape and is partitioned by a partition wall. The movable wall rotates and reciprocates in the air chamber. The vent hole is provided between the movable wall and the partition wall in the air chamber, and connects the air chamber and the outside. The valve body protrudes from the movable wall, and the movable wall moves toward the partition wall while sending the fluid in the air chamber, and closes the vent hole before a predetermined distance in contact with the partition wall.

  According to the present invention, it is possible to suppress the occurrence of a hitting sound.

FIG. 1A is a perspective perspective view of the deposit removal apparatus according to the embodiment. FIG. 1B is a perspective perspective view of the air compression unit according to the embodiment. FIG. 2 is a perspective view of the cylinder according to the embodiment. FIG. 3 is a top view of the rotating unit according to the embodiment. FIG. 4 is an operation explanatory diagram (part 1) of the air compression unit. FIG. 5 is an operation explanatory diagram (part 2) of the air compression unit. FIG. 6 is an operation explanatory diagram of an air compression unit according to a modification. FIG. 7 is a diagram illustrating an air compression unit according to a modification. FIG. 8 is a diagram illustrating an air compression unit according to a modification.

  Hereinafter, embodiments of a pump disclosed in the present application will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below. In the following description, the case where the deposit removing device is a device that is mounted on a vehicle and removes deposits attached to a camera that captures the periphery of the vehicle will be described as an example.

  FIG. 1A is a perspective perspective view of the deposit removal apparatus 1 according to the embodiment. FIG. 1B is a perspective perspective view showing the configuration of the air compressor 10 (an example of a pump). As shown in FIG. 1A, the deposit removal device 1 includes an output unit 5 and an air compression unit 10.

  The air compressing unit 10 compresses air by driving a motor (not shown) to generate compressed air, and jets the generated compressed air to the vehicle camera 50 via the output unit 5. Removes deposits such as raindrops on the lens.

  Here, the target from which the deposits are removed by the deposit removing device 1 is the camera 50, but the present invention is not limited to this.

  That is, for example, an optical sensor that acquires an image through a lens or acquires information on a target around the vehicle may be used. Specifically, for example, an optical sensor such as a radar device that detects a target around the vehicle can be targeted. Or it may not be an optical sensor, and what is aiming at the removal of a deposit | attachment may be sufficient.

  The air compression unit 10 is a rotary air compression mechanism. Specifically, as shown in FIG. 1B, the air compression unit 10 includes a cylinder 11 (an example of an air chamber) and a rotation unit 12. The cylinder 11 includes a cylinder wall 11a (an example of a partition wall), a vent hole 11b, and a flow path portion 11c.

  The cylinder 11 is formed in a cylindrical shape, for example, and a cylinder chamber is formed inside. The cylinder wall 11a is formed, for example, in a flat plate shape, and is provided so as to partition the cylindrical cylinder chamber substantially along the radial direction at a position that is point-symmetric about the rotation axis axR (an example of the central axis). Therefore, the cylinder 11 is partitioned into two cylinder chambers by being partitioned by the cylinder wall 11a.

  The vent hole 11b is opened in the vicinity of the cylinder wall 11a at a position that is point-symmetric about the rotation axis axR in the ceiling portion of the cylinder chamber. Thereby, the vent hole 11b connects the cylinder chamber and the outside. And the compressed air produced | generated based on rotation of the rotation part 12 mentioned later is sent out outside (output part) from a cylinder chamber via this vent hole 11b.

  The flow path portion 11c is connected to each of the vent holes 11b and is formed in a shape that is point-symmetric about the rotation axis axR. In addition, the flow path part 11c is connected to the output part 5 on the axis of the rotation axis axR. The compressed air sent out from the cylinder chamber through the vent hole 11b is guided to the output unit 5 through the flow path unit 11c (see arrow 101 in the figure), and is jetted to the camera 50 through the output unit 5. The Rukoto.

  The rotating part 12 includes a blade part 12a (an example of a movable wall), a rotating base 12b, and a shaft part 12c. The rotation base 12b is formed in a circular flat plate shape, and is provided to be rotatable around a rotation axis axR. The rotation base 12b is connected to a motor (not shown).

  The rotation base 12b is biased by a spring member (not shown) in a direction opposite to the rotation direction of the motor in a free state where the rotation base 12b is not driven by the motor. The shaft portion 12c is a shaft portion in rotation around the rotation axis axR.

  The blade portion 12a is formed in a flat plate shape and is erected so as to partition the rotary base 12b along the radial direction. The rotating unit 12 is engaged with the cylinder 11 and rotates (arrow 102 in the drawing) in the cylinder chamber, so that compressed air is generated.

  Specifically, the blade portion 12a is sucked into the cylinder chamber via the intake valve 13 provided on the wall surface by rotating in a direction away from the cylinder wall 11a by driving the motor. Then, when the motor drive is released, the blade 12a moves to the cylinder wall 11a side by the spring force of the spring member. At this time, the intake valve 13 is closed, and the intake air is compressed and sent out from the vent hole 11b in a high pressure state. The specific operation of the rotating unit 12 will be described later with reference to FIG.

  Here, the structure of the conventional blade | wing part is demonstrated. In the case of the conventional structure of the blade part, when the compressed air is sent to the cylinder wall and returned to the state where it is in contact with the cylinder wall, the blade part and the cylinder wall collide vigorously, so Could occur. And when the hitting sound which generate | occur | produced echoes in the vehicle interior, there exists a possibility of giving a passenger discomfort.

  Therefore, the air compression unit 10 according to the embodiment includes a valve body 12d. Specifically, the air compressing unit 10 according to the embodiment protrudes from the blade portion 12a, the blade portion 12a moves to the cylinder wall 11a while sending the compressed air, and the air hole is in a predetermined distance before contacting the cylinder wall 11a. The valve body 12d which closes 11b is provided.

  When the vent hole 11b is closed by the valve body 12d, the cylinder chamber is in a sealed state, so that sealed air is interposed between the blade portion 12a and the cylinder wall 11a.

  Thereby, the air compression part 10 which concerns on embodiment absorbs the force which goes to the cylinder wall 11a of the blade | wing part 12a because sealed air plays the role of a cushion, and softens the collision with the blade | wing part 12a and the cylinder wall 11a. be able to. That is, it is possible to suppress the occurrence of impact sound due to the collision between the blade portion 12a and the cylinder wall 11a.

  Next, the cylinder 11 will be further described with reference to FIG. FIG. 2 is a perspective view of the cylinder 11 according to the embodiment. Note that, from the viewpoint of making the explanation easy to understand, one of the above-described two cylinder chambers will be referred to as a cylinder chamber CC1, and the cylinder chamber CC1 will be described. The same applies to the other partitioned cylinder chamber.

  Here, in FIG. 2, among the wall surfaces of the cylinder wall 11a, the surface opposite to the blade portion 12a side is defined as a first wall surface 11aa, and the surface on the blade portion 12a side is defined as a second wall surface 11ab.

  As shown in M1 part of FIG. 2, one intake port 11d is opened in the cylinder chamber CC1. The intake port 11d is opened so that the outside of the cylinder 11 and the cylinder chamber CC1 are connected. Specifically, the intake port 11d is opened to communicate with the first wall surface 11aa side of the cylinder wall 11a of the cylinder chamber CC1, and intakes air from the outside in the direction of the cylinder chamber CC1 (arrow 301 in the figure).

  As shown in FIG. 2, the cylinder 11 is formed by a cylindrical side wall 11e and a ceiling portion 11f that is an end surface provided at an end of the side wall 11e. Moreover, as shown in FIG. 2, the cylinder wall 11a has a recessed shape. Specifically, a part of the cylinder wall 11a is inclined when the ceiling portion 11f is viewed from the direction of the rotation axis axR. Such inclination (inclined surface 101) will be described later with reference to FIG.

  And as shown to M2 part of FIG. 2, one ventilation hole 11b is opened by cylinder chamber CC1. The ventilation hole 11 b is opened in the ceiling portion 11 f of the cylinder 11. Specifically, the vent hole 11b is opened so that at least a part thereof enters the recessed shape of the cylinder wall 11a, and the generated compressed air is sent from the cylinder chamber CC1 to the outside direction (arrow 302 in the figure). To do.

  As will be described in detail later, the vent hole 11b is closed so that the valve body 12d of the blade 12a enters the recessed shape of the cylinder wall 11a. Thereby, since the blade | wing part 12a and the cylinder wall 11a can be closely approached, more compressed air can be sent out.

  Next, the valve body 12d will be described with reference to FIG. FIG. 3 is a top view of the rotating unit 12 according to the embodiment. In FIG. 3, a part of the cylinder 11 is indicated by a broken line for easy understanding. Further, FIG. 3 shows an arrangement when the rotating unit 12 is in a free state.

  As shown in FIG. 3, a pair of blade portions 12 a are provided at positions that are point-symmetric about a shaft portion 12 c that is a central axis. And the valve body 12d is provided in each of a pair of blade | wing part 12a. As a result, it is possible to prevent the impact noise generated when the compressed air is sent out simultaneously in the two cylinder chambers.

  Moreover, as shown in FIG. 3, the valve body 12d protrudes toward the cylinder wall 11a on the near side in the free state. Specifically, in the valve body 12d, on the cylinder wall 11a side, the locus caused by the rotation passes through the vent hole 11b. More specifically, the valve body 12d protrudes along the ceiling portion 11f and closes the vent hole 11b.

  In other words, the valve body 12d does not come into contact with the other cylinder wall 11a even when the rotating portion 12 approaches the other cylinder wall 11a in the intake state driven by the motor. For this reason, since the blade | wing part 12a can be closely approached to the other cylinder wall 11a, more air can be suck | inhaled.

  Next, a specific operation of the air compressor 10 will be described with reference to FIGS. 4 and 5. 4 and 5 are operation explanatory views (No. 1) and (No. 2) of the air compression unit 10. FIG.

  As shown in FIG. 4, the air compressor 10 is in a free state where it is not driven by the motor of the rotating part 12 in the “before intake” state, and the blade part 12 a is energized by the “spring force” of the spring member. In this state, it is pressed against the cylinder wall 11a.

  When the blade portion 12a is rotated about the rotation axis axR in a direction away from the cylinder wall 11a by the “driving force by the motor” from this state (see arrow 303 in the drawing), the space between the blade portion 12a and the cylinder wall 11a. SP expands. The output unit 5 (see FIG. 1) is provided with a check valve (not shown) so that air does not flow back from the vent hole 11b to the space SP.

  As a result, a negative pressure is generated in the space SP, and air outside the cylinder 11 is taken in from the intake port 11d as indicated by an arrow 304 in the figure, and further, the air is “intaken” into the space SP via the intake valve 13. The

  And if the blade | wing part 12a rotates to a predetermined position, the drive force of a motor will be cancelled | released. Then, the blade | wing part 12a released from the drive force of the motor vigorously returns to the cylinder wall 11a side by the “spring force” of the spring member.

  Specifically, when the blade portion 12a rotates around the rotation axis axR in the opposite direction (clockwise) from the “intake” state (see the arrow 305 in the drawing), the blade portion 12a is It approaches the cylinder wall 11a and contracts the space SP. At this time, since the intake valve 13 is closed, the air “intake” into the space SP is compressed, and compressed air is generated.

  The generated compressed air is rotated around the rotation axis axR until a predetermined distance before the blade portion 12a returns to the state in contact with the cylinder wall 11a. It is pushed out from the vent hole 11b and "exhaust" (see arrow 306 in the figure).

  At this time, as shown in the lower part of FIG. 4, the valve body 12d closes the vent hole 11b before the blade section 12a contacts the cylinder wall 11a, thereby sending compressed air from the vent hole 11b. Disappear.

  At this time, the air that is no longer sent from the vent hole 11b is interposed as sealed air between the blade portion 12a and the cylinder wall 11a, and attenuates the force of the blade portion 12a toward the cylinder wall 11a. The damped blade portion 12a then moves slowly until it comes into contact with the cylinder wall 11a, and returns to the above-described free state.

  FIG. 5 is a cross-sectional view taken along line AA shown in FIG. 3 and schematically shows exhaust when the air compression unit 10 is viewed from the side surface side. FIG. 5 shows the “exhaust” state of FIG. 4. As shown in FIG. 5, the cylinder wall 11 a has a step 100 at a recessed portion.

  Specifically, the step 100 is provided on the ceiling 11f side of the cylinder wall 11a, and the height position on the cylinder wall 11a corresponds to the valve body 12d. More specifically, in the step 100, the step surface 100a of the step 100 is connected to the end portion on the ceiling portion 11f side of the inclined surface 101 inclined from the second wall surface 11ab of the cylinder wall 11a toward the ceiling portion 11f.

  In other words, the cylinder wall 11a has a step surface 100a that is parallel to the surface forming the ceiling portion 11f and falls from the surface forming the ceiling portion 11f toward the cylinder 11 at the vent hole 11b.

  In the “exhaust” state, the valve body 12 d and the step surface 100 a of the step 100 abut against each other so as to rub in the axial direction that is the vertical direction of the cylinder 11.

  More specifically, when the tip of the valve body 12d has moved to the boundary between the inclined surface 101 and the stepped surface 100a, the space SP is sealed to act as a damping action, and thereafter slowly rub the stepped surface 100a. Move to.

  As a result, the space SP is sealed, and the kinetic energy associated with the rotation of the blade portion 12a can be reliably attenuated before the cylinder wall 11a by the frictional force between the blade portion 12a and the step 100. Can be suppressed. Although some frictional noise is generated due to the friction between the blade portion 12a and the step 100, it is not a sound that reverberates inside the vehicle.

  FIG. 5 shows the length W1 from which the valve body 12d protrudes and the distance W2 from the cylinder wall 11a to the step 100, and the dimensions of the length W1 and the distance W2 indicate that the valve body 12d has a vent hole. It is preferable not to contact the step 100 when 11b is closed.

  Further, as shown in FIG. 5, since the cylinder wall 11a has the inclined surface 101, the flow path to the vent hole 11b can be widened, so that the exhaust resistance of the air discharged to the vent hole 11b can be reduced. .

  That is, it is preferable that the protruding length W1 of the valve body 12d is not more than the distance W2 from the cylinder wall 11a to the step 100.

  Thereby, since it can prevent that the valve body 12d and the level | step difference 100 contact | abut in the circumferential direction, generation | occurrence | production of an impact noise can be suppressed reliably. In addition, the closer the length W1 is to the length of the distance W2, the more compressed air can be sent out.

  As described above, the pump (air compression unit 10) according to the embodiment includes an air chamber (cylinder 11), a movable wall (blade portion 12a), a vent hole 11b, and a valve body 12d. The air chamber has a cylindrical shape and is partitioned by a partition wall (cylinder wall 11a). The movable wall rotates and reciprocates in the air chamber. The air hole 11b is provided between the movable wall and the partition wall in the air chamber, and connects the air chamber and the outside. The valve body 12d protrudes from the movable wall, and the movable wall moves toward the partition wall while sending fluid (compressed air) in the air chamber, and closes the vent hole 11b before a predetermined distance contacting the partition wall. Thereby, generation | occurrence | production of a hitting sound can be suppressed.

  In the above-described embodiment, the case where the cylinder wall 11a, which is a movable wall, rotates and reciprocates has been described. However, the present invention is not limited to this. It may be. This point will be described with reference to FIG.

  FIG. 6 is an explanatory diagram of the operation of the air compression unit 10 according to the modification. FIG. 6 shows “intake” and “exhaust” states of the air compressor 10 according to the modification.

  As shown in FIG. 6, the air compression unit 10 is a piston-type air compression mechanism, and the blade portion 12 a performs a piston motion. Specifically, the blade portion 12a is “taken in” by taking in air from an intake port (not shown) by moving away from the cylinder wall 11a of the cylinder 11 by driving a motor (not shown).

  Then, when the motor drive is released, the blade 12a moves vigorously toward the cylinder wall 11a, and sends out compressed air from the vent hole 11b. And when the blade | wing part 12a arrives before the predetermined distance which contact | abuts to the cylinder wall 11a, the valve body 12d provided between the blade | wing part 12a and the cylinder wall 11a block | closes the vent hole 11b.

  Accordingly, since the space between the blade portion 12a and the cylinder wall 11a is sealed to generate sealed air, it is possible to prevent the blade portion 12a from colliding with the cylinder wall 11a vigorously, thereby suppressing the occurrence of impact noise. be able to.

  The cylinder wall 11a may not have the inclined surface 101. This point will be described with reference to FIGS.

  7 and 8 are views showing an air compression unit 10 according to a modification. For example, as shown in FIG. 7, the cylinder wall 11 a may have only a step 100. That is, the step surface 100a is connected to the end of the second wall surface 11ab of the cylinder wall 11a on the ceiling 11f side. Thereby, since the flow path of the ventilation hole 11b can be made small, the dumpling action when the tip of the valve body 12d abuts on the step surface 100a and the space SP is sealed can be strengthened.

  Further, for example, as shown in FIG. 8, the step 100 may be stepped. Thereby, since the flow path of the vent hole 11b can be widened, the exhaust resistance can be reduced.

  In the above-described embodiment, the air compression unit 10 that generates compressed air has been described as an example of the pump. However, the pump is not limited to the air compression unit 10 and is a pump used when ejecting liquid. It may be.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

DESCRIPTION OF SYMBOLS 1 Adhering substance removal apparatus 5 Output part 10 Air compression part 11 Cylinder 11a Cylinder wall 11b Vent hole 11c Flow path part 11d Inlet 11e Side wall 11f Ceiling part 12 Rotating part 12a Blade part 12b Rotating base 12c Shaft part 12d Valve body 13 Intake valve 50 Camera 100 Step axR Rotation axis

Claims (6)

A cylindrical air chamber partitioned by a partition;
A movable wall that rotates and reciprocates in the air chamber;
A vent hole provided between the movable wall and the partition wall in the air chamber, and connecting the air chamber and the outside;
A valve body protruding from the movable wall, the movable wall moving toward the partition wall while sending the fluid in the air chamber, and closing the vent hole before a predetermined distance contacting the partition wall. pump. The valve body is
The pump according to claim 1, wherein the pump protrudes toward the partition wall. The air chamber is
It is formed by a cylindrical side wall and a ceiling that is an end surface provided at one end of the side wall,
The movable wall is
Reciprocating around the central axis of the side wall,
The vent is
Provided in the ceiling,
The valve body is
The pump according to claim 1, wherein the pump projects along the ceiling. The partition is
The movable wall has a shape recessed in a direction opposite to a direction,
The vent is
The pump according to claim 3, wherein at least a part is provided so as to enter the recessed shape. The partition is
In the portion of the vent hole, it has a step surface that is parallel to the surface forming the ceiling portion and falls from the surface forming the ceiling portion to the air chamber side,
The valve body is
The pump according to claim 3 or 4, wherein the pump contacts the step surface. The movable wall is
A pair is provided at a point symmetric with respect to the central axis,
The valve body is
The pump according to any one of claims 3 to 5, wherein the pump is provided on each of the pair of movable walls.

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