JP2021120546A - Fluid injection device - Google Patents

Abstract

To suppress operating noise.SOLUTION: A fluid injection device according to an embodiment includes a pump part and a housing. The pump part has, on side surfaces, a plurality of shafts each covered with an elastic member, and feeds fluid under a pressure. The housing accommodates the pump part in a state of being separated from a pump part main body by sandwiching and holding the shafts via the elastic members.SELECTED DRAWING: Figure 4

Description

The present invention relates to a fluid ejection device.

Conventionally, a camera mounted on a vehicle and taking an image of the surroundings of the vehicle has been known. The image captured by such a camera is displayed on a monitor to assist the driver's field of vision, or is used for sensing to detect a white line on a road or an object approaching a vehicle.

For example, raindrops, snowflakes, dust, mud, and other deposits may adhere to the lens of such a camera, which may interfere with the above-mentioned visibility assistance and sensing. Therefore, in recent years, a fluid ejection device that removes deposits by injecting compressed air toward a camera lens has been proposed (see, for example, Patent Document 1).

JP-A-2018-84178

However, in the prior art, there is room for improvement in suppressing the operating noise. Specifically, in the prior art, the operating noise of the fluid ejection device propagates to the inside of the vehicle, which hinders the provision of a comfortable interior space.

The present invention has been made in view of the above, and an object of the present invention is to provide a fluid ejection device capable of suppressing operating noise.

In order to solve the above-mentioned problems and achieve the object, the fluid ejection device according to the embodiment includes a pump unit and a housing. The pump portion has a plurality of shafts each covered with an elastic member on a side surface, and pumps a fluid. The housing accommodates the pump unit in a state of being separated from the pump unit main body by sandwiching and holding the shaft via the elastic member.

According to the present invention, the operating noise can be suppressed.

FIG. 1 is a schematic view showing a mounting example of a fluid ejection device. FIG. 2 is a diagram showing an example of the appearance of the fluid ejection device. FIG. 3 is a diagram showing a configuration example of a fluid ejection device. FIG. 4 is a schematic side view of the fluid ejection device. FIG. 5 is a diagram showing a stopper portion. FIG. 6 is a top view of the inside of the fluid ejection device according to the modified example.

Hereinafter, the fluid ejection device according to the embodiment will be described with reference to the accompanying drawings. The present invention is not limited to the embodiments shown below.

First, an example of mounting the fluid ejection device according to the embodiment will be described with reference to FIG. FIG. 1 is a diagram showing a mounting example of a fluid ejection device. Note that FIG. 1 shows a deposit removing system 1 including a fluid ejection device. Further, FIG. 1 shows a case where the fluid ejection device is installed inside the back door of the vehicle. Further, although the case where the fluid ejection device ejects a gas as a fluid will be described below, the fluid may be a liquid.

The fluid ejection device 10 shown in FIG. 1 is a device that has a motor (not shown) inside and injects gas by performing a piston movement according to the rotation of the motor. The fluid ejection device 10 injects gas by operating a motor in response to a control signal input from the harness H.

Further, the gas compressed by the fluid ejection device 10 is pressure-fed to the nozzle 30 via the hose 20. After that, the gas is injected from the nozzle 30 toward the camera 50. As a result, the deposits adhering to the lens of the camera 50 can be removed.

Further, in the example shown in FIG. 1, the fluid ejection device 10 is fixed to the outer panel Po of the back door of the vehicle. The adhesive member T is, for example, a double-sided tape, but may be a resin or the like. When the outer panel Po vibrates due to the vibration caused by the piston movement in addition to the operating noise caused by the piston movement of the fluid ejection device 10, the vibration sound caused by the vibration of the outer panel Po is generated inside the back door (outer panel Po and inner panel Pi). Amplifies in the space between).

In the present embodiment, in addition to the above-mentioned operating sound, the vibration sound is included in the definition as the operating sound of the fluid ejection device 10. Further, in the example shown in FIG. 1, a case where the fluid ejection device 10 is fixed to the outer panel Po by an adhesive member T such as double-sided tape is shown.

Further, in recent years, vehicles such as hybrid vehicles and electric vehicles in which the running noise of the vehicle itself is quiet are becoming widespread, so even a relatively small operating noise may be heard by the occupants in the vehicle, which is a comfortable interior space. It hinders the provision of.

Therefore, the fluid ejection device 10 according to the embodiment is determined to suppress the operating noise by the fixed mode of the fluid ejection device 10. That is, the fluid ejection device 10 according to the embodiment suppresses the operating noise by suppressing the vibration propagating to the outer panel Po due to the piston movement in addition to the sound generated by the piston movement.

FIG. 2 is a diagram showing an example of the appearance of the fluid ejection device 10. As shown in FIG. 2, the housing of the fluid ejection device 10 is composed of an upper cover 11 and a lower cover 12. Further, the upper cover 11 and the lower cover 12 sandwich and hold the shaft S, and the harness H is connected to the housing. Hereinafter, the housing including the upper cover 11 and the lower cover 12 will be referred to as a device housing.

As will be described later, the shaft S is provided on the side surface of the pump portion 13 (see FIG. 3), and the pump portion 13 is fixed in the apparatus housing by the shaft S. Further, as will be described later, the shaft S is covered with an elastic member such as rubber, and the upper cover 11 and the lower cover 12 hold the shaft S via the elastic member.

In this way, by holding the shaft S via the elastic member, the apparatus housing can absorb the vibration accompanying the piston movement of the pump portion 13 by the elastic member, so that the vibration of the pump portion 13 is absorbed by the outer panel. Propagation to Po can be suppressed.

Next, a configuration example of the fluid ejection device 10 will be described with reference to FIG. FIG. 3 is a diagram showing a configuration example of the fluid ejection device 10. Note that FIG. 3 corresponds to a top view of the fluid ejection device 10 with the upper cover 11 removed.

As shown in FIG. 3, the fluid ejection device 10 includes a pump unit 13, a control board 14, a board holder 15, and an elastic member G. The pump unit 13 has a motor and a piston mechanism inside, and compresses gas. Further, the pump unit 13 discharges the gas injected from the discharge port 13a toward the hose 20.

Here, the pump unit 13 has a structure in which it is covered by its own housing (hereinafter, referred to as a pump housing), and further, the outside thereof is covered by a device housing. That is, by covering the pump unit 13 with a double housing of the pump housing and the device housing, it is possible to suppress the operating noise accompanying the piston movement from propagating to the outside of the fluid ejection device 10. ..

That is, since the operating sound propagated from the pump unit 13 to the outside is further soundproofed by the device housing, it is possible to suppress the operating sound from propagating to the outside of the fluid ejection device 10.

Further, as shown in FIG. 3, an elastic member G is provided on the side surface of the pump portion 13 for the shaft S shown in FIG. By absorbing the vibration of the pump unit 13 by the elastic member G, it is possible to suppress the vibration of the pump unit 13 from propagating to the outside of the fluid ejection device 10.

That is, by absorbing the vibration of the pump portion 13 by the elastic member G, it is possible to suppress the vibration of the pump portion 13 from being transmitted to the outer panel Po.

The control board 14 is a board that controls the pump unit 13. As shown in FIG. 3, the control board 14 is fixed to the housing by the board holder 15. Since the pump unit 13 is fixed via the elastic member G, it is relatively flexibly fixed, whereas the control board 14 is fixed to the rigid by fixing the control board 14 separately from the pump unit 13. ..

If the control board 14 is provided in the pump section 13, the control board 14 vibrates in accordance with the vibration of the pump section 13. Therefore, in this case, the harness H vibrates in accordance with the vibration of the control board 14, so that, for example, the harness H is disengaged from the control board 14 or a gap is created between the harness H and the device housing. I can let you.

If a gap is generated between the harness H and the device housing, there is a concern that the operating sound may leak from the gap, which hinders the reduction of the operating noise. In addition, there is a concern that water or dust may enter through such a gap, which may lead to a failure of the control board 14.

On the other hand, by fixing the control board 14 to the rigid, the above problems can be solved at once.

The board holder 15 is, for example, a thin metal plate, and is a component that fixes the control board 14 to the housing. Further, the substrate holder 15 is provided with a stopper portion 15a and a screw hole 15b on the upper surface thereof. The stopper portion 15a has a shape protruding from the control board 14 side toward the pump portion 13. The details of the stopper portion 15a will be described later with reference to FIG.

The screw hole 15b is a hole provided in the stopper portion 15a and into which a screw penetrating the upper cover 11 is inserted into the screw hole 15b. As a result, the upper cover 11 and the substrate holder 15 are fixed. That is, by fixing the substrate holder 15 to the upper cover 11 with screws, the displacement of the substrate holder 15 can be suppressed.

Next, the fixed position of the pump unit 13 in the apparatus housing will be described with reference to FIG. FIG. 4 is a schematic side view of the fluid ejection device 10. As shown in FIG. 4, the upper cover 11 and the lower cover 12 hold the pump portion 13 by sandwiching the shaft S via the elastic member G.

Further, as shown in FIG. 4, the pump portion 13 is held by the apparatus housing in a state of being separated from the upper cover 11 and the lower cover 12, respectively. That is, in the pump unit 13, the pump housing does not come into direct contact with the device housing, but is housed in the device housing via the elastic member G.

Therefore, the vibration accompanying the piston movement of the pump unit 13 is not directly transmitted to the device housing, but is absorbed by the elastic member G interposed between the pump unit 13 and the device housing and propagated to the device housing. Will be done. In other words, a part of the vibration of the pump portion 13 is damped by the elastic member G.

By fixing the pump unit 13 and the device housing in a separated state in this way, the vibration of the pump unit 13 is propagated to the device housing in a attenuated state, so that the vibration of the device housing is suppressed. be able to.

As a result, the vibration propagating from the device housing to the outer panel Po can be reduced, so that the vibration of the outer panel Po can be suppressed, and the operating noise caused by the vibration of the outer panel Po can be reduced. Become.

Next, the stopper portion 15a will be described with reference to FIG. FIG. 5 is a diagram showing a stopper portion 15a. As shown in FIG. 5, the stopper portion 15a has a shape protruding from the upper side of the control board 14 toward the pump portion 13.

Here, in the present embodiment, the distance d between the stopper portion 15a and the pump portion 13 is provided to be shorter than the distance between the pump portion 13 and the control board 14. Therefore, if the pump portion 13 vibrates toward the control board 14, the stopper portion 15a suppresses the contact between the pump portion 13 and the control board 14 by contacting the stopper portion 15a with the pump portion 13. ..

That is, the stopper portion 15a can avoid contact between the pump portion 13 and the control board 14, and can suppress damage to the control board 14 due to contact between the pump portion 13 and the control board 14. ..

Although the case where the stopper portion 15a is provided on the upper side of the control board 14 is shown here, the stopper portion 15a may be at a position where contact between the pump portion 13 and the control board 14 can be avoided. For example, it may be provided at another position. Further, the number of stopper portions 15a does not have to be one, and may be a plurality.

Further, as shown in FIG. 5, since the substrate holder 15 also serves as the stopper portion 15a, the number of parts can be reduced as compared with the case where the stopper portion 15a is separately provided.

As described above, the fluid ejection device 10 according to the embodiment includes a pump unit 13 and a housing (device housing). The pump unit 13 has a plurality of shafts each covered with an elastic member G on the side surface, and pumps a gas (an example of a fluid). The housing accommodates the pump unit 13 in a state of being separated from the main body of the pump unit 13 by sandwiching and holding the shaft S via the elastic member G. Therefore, according to the fluid ejection device 10 according to the embodiment, the operating noise can be suppressed.

By the way, in the above-described embodiment, the case where the housing sandwiches and holds the shaft S via the elastic member G has been described, but the present invention is not limited to this. That is, the shaft S may also serve as the discharge port 13a.

FIG. 6 is a top view of the inside of the fluid ejection device 10 according to the modified example. As shown in FIG. 6, in the fluid ejection device 10 according to the modified example, the discharge port 13a is covered with the elastic member G, and the discharge port 13a also functions as the shaft S.

That is, the pump portion 13 is held in the device housing by the discharge port 13a and the shaft S. Therefore, in this case, the number of shafts S itself can be reduced, so that the number of parts can be reduced.

By the way, in the above-described embodiment, the case where the fluid ejection device 10 is installed on the back door of the vehicle has been described as an example, but the present invention is not limited to this. That is, the fluid ejection device 10 is not limited to the back door, and may be installed at a place other than the vehicle, or may be installed at a place other than the vehicle.

Further, in the above-described embodiment, the case where the fluid ejection device 10 is included in the deposit removing system 1 has been described, but the usage of the fluid ejection device 10 is not limited to this, and is appropriately changed. You may decide. Further, the ejection target of the fluid ejection device 10 is not limited to the camera 50, and may be various sensors such as a millimeter wave radar, for example. In particular, the present invention is effective when the fluid ejection device 10 is installed in a quiet environment.

Further effects and variations can be easily derived by those skilled in the art. For this reason, the broader aspects of the invention are not limited to the particular details and representative embodiments expressed and described as described above. Therefore, various modifications can be made without departing from the spirit or scope of the general concept of the invention as defined by the appended claims and their equivalents.

1 Adhesion removal system 10 Fluid ejection device 11 Top cover 12 Bottom cover 13 Pump part 13a Discharge port 14 Control board 15 Board holder 15a Stopper part 20 Hose 30 Nozzle 50 Camera G Elastic member H Harness Pi Inner panel Po Outer panel S Shaft

Claims (5)

A pump unit that has multiple shafts, each covered with an elastic member, on the side surface to pump fluid,
A fluid ejection device including a housing that accommodates the pump portion in a state of being separated from the main body of the pump portion by sandwiching and holding the shaft via the elastic member. A control board for controlling the pump unit is further provided.
The control board is
The fluid ejection device according to claim 1, wherein the fluid ejection device is provided inside the housing and outside the pump portion. The pump unit
It is provided at a predetermined distance from the control board.
The fluid ejection device according to claim 2, further comprising a stopper portion provided between the pump portion and the control board and avoiding contact between the pump portion and the control board. The stopper portion is
The fluid ejection device according to claim 3, wherein the control board is provided on a board holder for fixing the control board to the housing. The pump unit
The fluid ejection device according to any one of claims 1 to 4, wherein the discharge port for discharging the pumped fluid to the outside of the housing also serves as the shaft.

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