CN216313230U - Air injection system for camera window - Google Patents

Abstract

The utility model discloses an air injection system for a camera window. The air injection system for the camera window comprises: air pump, air cock and gasbag, the air pump is used for the pump sending gas, the air cock is used for receiving and comes from the gas of air pump, and will gaseous guide to the camera window, in order to clean the camera window, gasbag (135) are the elasticity gasbag, on the gas circuit, the gasbag sets up the air pump with between the air cock. With the air injection system for the camera window, the efficiency of window cleaning can be improved in an air injection mode.

Description

Air injection system for camera window

Technical Field

The utility model relates to the technical field of imaging, in particular to an air injection system for a camera window.

Background

The monitoring products have the problem that the picture is not clear or the picture is invalid due to the fact that the window is adhered by rainwater and dust in the long-time use process. Thus, the window needs to be cleaned periodically.

Self-cleaning techniques for windows are known in the prior art. For example, one prior art technique employs a self-cleaning technique in the form of mechanical scraping in the form of a wiper. This approach has limitations in application. On the one hand, the windshield wiper has damage to coated glass and PC material window, scrapes coating film layer and PC material surface easily, reduces the transparency of window surface, perhaps reduces the life of product.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an air injection system for a camera window, which can improve the window cleaning efficiency in an air injection mode.

In order to achieve the above object, the present invention provides a gas injection system for a camera window, comprising: an air pump, an air nozzle and an air bag,

the gas pump is used for pumping gas,

the air tap is used for receiving the air from the air pump and guiding the air to the camera window so as to clean the camera window,

the air bag is an elastic air bag, and on the air path, the air bag is arranged between the air pump and the air tap.

Preferably, the gas injection system further comprises: the air inlet end of the air bag is communicated with the air pump air path, and the air outlet end of the air bag is communicated with the air tap air path through the electromagnetic valve.

Preferably, the gas injection system further comprises: an air inlet pipe and an air outlet pipe,

the air bag is communicated with the air pump air path through an air inlet pipe, the air outlet end of the air bag is directly communicated with one end of the electromagnetic valve, and the other end of the electromagnetic valve is communicated with the air tap air path through the air outlet pipe.

Preferably, the gas injection system further comprises: an air pump upper cover and an air pump lower cover,

the air pump upper cover and the air pump lower cover are fixedly connected with each other, an air pump accommodating space is limited, and the air pump is arranged in the air pump accommodating space.

Preferably, the gas injection system further comprises: the air pump support is arranged in the air pump accommodating space and fixedly mounted to the air pump lower cover or the air pump upper cover, the shock pad is arranged between the air pump and the air pump support, and the air pump is fixed to the air pump support.

Preferably, the gas injection system further comprises: an upper cover of the air bag and a lower cover of the air bag,

the air bag upper cover and the air bag lower cover are fixedly connected with each other and limit an air bag accommodating space, and the air bag and the electromagnetic valve are arranged in the air bag accommodating space.

Preferably, an air bag sealing ring is arranged at the joint of the air inlet end of the air bag and the air inlet pipe.

Preferably, the maximum enduring air pressure of the air bag is equal to or greater than the maximum working static pressure of the air pump.

Preferably, the air tap includes:

an air nozzle cavity defining a rectification air chamber;

the air inlet is positioned on the air inlet side of the rectification air chamber and communicated with the air inlet side of the rectification air chamber, and the cross section of the air inlet is circular;

the air outlet is positioned on the air outlet side of the rectification air chamber and is communicated with the air outlet side of the rectification air chamber;

wherein, a three-dimensional coordinate system is established in the following way: the direction from the air inlet side to the air outlet side is the X direction, the length direction of the air outlet is the Y direction, the direction vertical to the X direction and the Y direction is the Z direction,

in the X direction, from the air inlet side to the air outlet side, the size of the rectification air chamber in the Y direction is gradually increased; the dimension in the Z direction gradually decreases.

Preferably, two vertical ribs are arranged in the air tap cavity, the vertical ribs extend along the Z direction to divide the rectification air chamber into three sub air chambers, each sub air chamber extends from the air inlet to the air outlet,

the two vertical ribs are symmetrical about an X-Z plane of the middle dividing rectification air chamber.

The utility model also provides a camera comprising a gas injection system for a camera window as described above.

According to the air injection system for the camera window, the efficiency of window cleaning can be improved in an air injection mode.

Drawings

Fig. 1 is a schematic top view of an air blast cleaning apparatus for a camera window according to an embodiment of the present invention.

FIG. 2 is a schematic view of a cleaning module body with a body cover removed according to one embodiment of the present invention.

Fig. 3 is an exploded view of an air pump assembly according to an embodiment of the present invention.

FIG. 4 is an exploded view of an airbag module according to an embodiment of the present invention, showing a solenoid valve, an outlet tube, and an air nozzle.

FIG. 5 is a schematic bottom view of a nozzle according to an embodiment of the present invention, and FIG. 5 shows the nozzle from the side of the nozzle cover of the nozzle, where the X direction and the Y direction are marked.

FIG. 6 is another schematic view of the air nozzle of FIG. 5, and FIG. 6 is a bottom view, with the cover of the air nozzle removed in FIG. 6. Alternatively, FIG. 6 schematically illustrates the nozzle base and air inlet of the nozzle of FIG. 5 from a bottom view.

FIG. 7 is a partial cross-sectional view of the air faucet shown in FIG. 5.

Fig. 8 and 9 are partial enlarged views of fig. 7, specifically enlarged views of a portion B in fig. 7. Wherein figure 9 carries the dimensional criteria.

FIG. 10 is a side view of the air faucet shown in FIG. 5, and the view angle of FIG. 10 is from the side where the air outlet is located.

Fig. 11 is another side view of the air nozzle shown in fig. 5, and the view angle of fig. 11 is viewed from the side of the end portion of the air nozzle, that is, from the left end portion of the air nozzle shown in fig. 10. Wherein figure 11 is shown in partial section. The partial cross-sectional cut line is along the line D-D in fig. 9.

Fig. 12 is a partial sectional view of the air nozzle in the same projection direction as fig. 11.

Reference numerals:

Detailed Description

In the drawings, the same or similar reference numerals are used to denote the same or similar elements or elements having the same or similar functions. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.

The air tap for cleaning the camera window provided by the embodiment of the utility model is mainly used for solving the problem that the window is bonded by rainwater and dust to cause an unclear picture or a invalid picture in the long-time use process of a conventional monitoring product. Especially for special scenes where the viewing window is prone to soiling. For example, the air nozzle for cleaning the camera window of the embodiment of the utility model can be applied to a camera installed in a dust raising area or a camera installed in a manner that the angle of view is an elevation angle, so as to provide good cleaning capability.

One technical challenge in cleaning the camera window with blown air is achieving an effective rectification of the air flow. To this end, embodiments of the present invention provide an air faucet for cleaning a camera window. The nozzle can be used in the following air jet cleaning system for camera windows.

Referring to fig. 1, an air blast cleaning system for a camera window according to an embodiment of the present invention includes: cleaning module main part 1, outlet duct 2 and gas nozzle 3. The cleaning module body 1 is capable of outputting gas, in particular gas with a certain pressure, which is ejected from the nozzle through the outlet tube 2 to flush the camera window with a gas flow, thereby cleaning the camera window.

It will be appreciated that the camera view is not limited to the flat view shown in figure 12 but also includes a hemispherical or other shaped view.

Referring to fig. 2 to 4, the cleaning module body 1 includes an air pump assembly 11, an air inlet duct 12, an air bag assembly 13, a solenoid valve 14, an air pump bracket 15, a body lower cover 16, and a body upper cover 17.

The lower body cover 16 and the upper body cover 17 define an accommodation space for accommodating the air pump assembly 11, the air inlet tube 12, the airbag assembly 13, the solenoid valve 14, and the air pump bracket 15. The air pump bracket 15 is used to mount the air pump assembly to the main body lower cover 16 or the main body upper cover 17.

The air pump assembly 11 includes an air pump 112. The gas pump 112 is used to generate gas or pump gas, especially gas having a certain pressure. The air tap 3 receives the pressure gas from the air pump 112 through the air outlet pipe 2 and guides the pressure gas to the camera window to clean the camera window.

The air inlet pipe 12 is arranged between the air pump assembly 11 and the airbag assembly 13 and communicates the air pump assembly 11 and the airbag assembly 13. The intake pipe 12 may take any suitable shape as needed and is not limited to the illustrated shape. For example, the inlet conduit 12 may be a flexible conduit having some compliance to facilitate installation.

The air bag module 13 is used to generate a pulsed air flow. Referring to fig. 4, the airbag module 13 includes an airbag 135. The bladder 135 is an elastomeric bladder. The air inlet end of the air bag 135 is in air path communication with the air pump 112, and the air outlet end of the air bag 135 is in air path communication with the air tap 3 through the electromagnetic valve 14.

Advantageously, the maximum withstand pressure of the air bladder 135 is equal to or greater than the maximum operating static pressure of the air pump 112. The maximum operating static pressure of the air pump 112 is the highest pressure that the air pump can achieve to inflate the enclosed volume at the operating voltage.

Further, a check valve may be provided in the air passage between the air bag 135 and the air pump 112 to allow only air to flow from the air pump 112 to the air bag 135.

The electromagnetic valve 14 is used for controlling the on-off of the air path. The solenoid valve 14 may be any suitable size solenoid valve. The solenoid valve has an off state (closed state) and an on state (open state).

When the solenoid valve 14 is closed, if the air pump 112 is powered on, the air bag 135 will be inflated until the internal air pressure of the air bag 135 reaches the maximum working static pressure of the air pump 112. In the process, the air bag with elasticity is expanded, and part of energy is converted into elastic potential energy of the air bag.

When the electromagnetic valve 14 is turned on, the air bag 135 forms a passage with the outlet tube 2 and the nozzle 3. The air in the air bag 135 is released in a momentary, high-speed manner by the high-pressure gas inside the air bag 135 and the elastic potential energy of the air bag 135 itself. Thereby generating a high pressure pulse airflow to better clean the viewing window. That is to say, the structure of elasticity gasbag and solenoid valve combination can form high-pressure pulse air current and replace conventional ordinary pressure air current to blow off the cleanness to the sight glass, has not only promoted the effect of blowing off, and the power requirement greatly reduced, the air pump volume size of air pump can reduce greatly moreover. The high-pressure pulse airflow is essentially high-speed airflow generated by instantaneous release of the high-pressure sealed container.

The inlet pipe 132 and the outlet pipe 2 are auxiliary members forming a communicating gas path. It will be appreciated that the inlet pipe 132 and the outlet pipe 2 may be omitted, and the respective components may be directly connected.

In the illustrated embodiment, the air bag 135 is in air path communication with the air pump 112 through an air inlet tube 132, an air outlet end of the air bag 135 is directly in air path communication with one end of the electromagnetic valve 14, and the other end of the electromagnetic valve 14 is in air path communication with the air tap 3 through the air outlet tube 2.

Referring to fig. 3, the air pump assembly further includes: an air pump upper cover 111, a shock-absorbing pad 113, a mounting bracket 114 and an air pump lower cover 116.

The air pump upper cover 111 and the air pump lower cover 116 are fixedly connected to each other and define an air pump accommodating space. The air pump 112, the cushion 113 and the mounting bracket 114 are disposed in the air pump accommodating space. The mounting bracket 114 is fixedly mounted to the air pump lower cover 116 or the air pump upper cover 111, the shock pad 113 is disposed between the air pump 112 and the mounting bracket 114, and the air pump 112 is fixed to the mounting bracket 114.

Also shown in fig. 3 is a control board 115. The control board 115 is, for example, a PCB board, and controls the operation of the air pump and the solenoid valve. In one embodiment, the PCB board independently controls the action of the air pump and solenoid valve, e.g., periodically performing self-cleaning. In another embodiment, the PCB board communicates with the control unit of the camera to cooperatively control the operation of the air pump and the solenoid valve.

It will be appreciated that the control board 115 is not required. For example, the air pump and the solenoid valve can be controlled directly by the control unit of the camera. Referring to fig. 4, the airbag module 13 includes, in addition to the airbag 135: an airbag upper cover 131, an airbag gasket 133, and an airbag lower cover 134.

The airbag upper cover 131 and the airbag lower cover 134 are fixedly coupled to each other and define an airbag receiving space. The air bag 135 and the solenoid valve 14 are disposed in the air bag accommodating space. An air bag sealing ring 133 is arranged at the joint of the air inlet end (the right end in fig. 4) of the air bag 135 and the air inlet pipe 132 to improve the sealing performance.

The air tap will be described with reference to the accompanying drawings. The nozzle 3 for cleaning the camera window according to the illustrated embodiment comprises: air nozzle cavity, air inlet 33 and air outlet 34.

The nozzle chamber is the main body portion of the nozzle 3 which defines a rectifying air chamber. In the illustrated embodiment, the nozzle cavity includes a nozzle base 31 and a nozzle cover 32 that are spliced together. The nozzle base 31 and the nozzle cover 32 can be connected to each other in any suitable manner, for example by screwing to form a detachable structure, or by ultrasonic welding to form an integral structure that is inseparable. The nozzle base 31 and nozzle cover 32 may take any suitable configuration and are not limited to the configurations illustrated in the present disclosure. Further, the terms of the nozzle base and the nozzle cover are used only for convenience of description, and do not limit the nozzle base to be located at the lower portion and the nozzle cover to be located at the upper portion. For example, in fig. 12, the nozzle base 31 is located above, and the nozzle cover 32 is located below.

The air inlet 33 is located on the air inlet side (left side in fig. 5) of the air tap cavity and is communicated with the air inlet side of the rectification air chamber.

The air outlet 34 is located on the air outlet side (right side in fig. 5) of the air tap cavity and is communicated with the air outlet side of the rectification air chamber, wherein the air outlet 34 is a slot.

Referring to fig. 5, a three-dimensional coordinate system is established in the following manner: the direction from the air intake side (left side in fig. 5, 11, 12) toward the air discharge side (right side in fig. 5, 11, 12) is the X direction, the length direction of the outlet port 34 is the Y direction, i.e., the up-down direction in fig. 5, 6, or the left-right direction in fig. 10, and the direction perpendicular to the X direction and the Y direction is the Z direction, i.e., the up-down direction in fig. 10-12.

In the X direction, the size of the rectification air chamber in the Y direction is gradually increased from the air inlet side to the air outlet side of the air nozzle cavity; the dimension in the Z direction gradually decreases.

Thus, the pressure air input from the air inlet 33 can be rectified and diffused by the air nozzle, so that the air outlet area can be enlarged, and the window area needing to be cleaned can be covered.

In order to improve the rectification effect and the uniformity of air outlet, especially the air flow strength at two ends of the air outlet, one or more vertical ribs 35 are arranged in the air nozzle cavity. The vertical ribs 35 extend along the Z direction, dividing the rectifying air chamber into a plurality of sub air chambers 37, each sub air chamber extending from the air inlet 33 to the air outlet 34. The number of sub-chambers 37 is equal to the number of vertical ribs 35 plus one. The number of vertical ribs 35 can be set as desired. One arrangement is to arrange even number of vertical ribs to form odd number of sub-air chambers. The middle sub-air chambers are symmetrical about an X-Z plane dividing the rectification air chamber. The sub-air chambers on the two sides are symmetrical relative to the middle sub-air chamber.

The vertical ribs are flow guide ribs and are used for forming structural characteristics of a preset air duct in the air faucet.

Specifically, referring to fig. 6, two vertical ribs 35 are disposed in the air faucet cavity, and the vertical ribs 35 extend along the Z direction to divide the rectification air chamber into three sub-air chambers, and each sub-air chamber extends from the air inlet 33 to the air outlet 34. The two vertical ribs 35 are symmetrical about an X-Z plane which divides the rectification air chamber. This is advantageous for improving the uniformity of the outlet air.

Referring to fig. 3, each vertical rib 35 includes an oblique rib section 351 and a parallel rib section 352 connected to each other, wherein the parallel rib section 352 is adjacent to the air outlet 34, and the oblique rib section 351 is adjacent to the air inlet 33. The parallel rib segments are perpendicular to the Y-axis. The angle between the diagonal rib section 351 and the parallel rib section 352 is an obtuse angle. The included angle a between the oblique rib sections 351 of the two vertical ribs 35 is less than or equal to 60 degrees. Therefore, the air flow of the middle sub-air chamber is ensured to have higher air flow strength.

In one embodiment, the parallel rib sections 352 of the two vertical ribs 35 divide the air outlet 34 into three sections in the Y direction, and the length ratio of the three sections is (3-4.5):5 (3-4.5), for example, specifically, L1: l2: l3 ═ 4:5: 4. This is advantageous for uniformity between the outlet air at the middle and both sides of the outlet.

Referring to fig. 8 and 9, in one embodiment, at the joint of the air inlet 3 and the air nozzle cavity, the air inlet 3 is equally divided by the equally dividing rib section 353 of the vertical rib 35. Thus, S1 is S2 is S3, where S1, S2, and S3 are effective cross-sectional flow areas and do not refer to the vertical dimension of the drawing in fig. 9. That is to say, the area ratio of the air inlets among different cavities in the air tap is 1:1: 1.

Specifically, in the joint of the air inlet 3 and the air tap cavity, in the X direction, the evenly-divided rib section 353 of the vertical rib 35 extends into the air inlet, and the depth length is greater than or equal to 1 mm.

Referring to FIG. 6, the nozzle cavity, or more specifically the nozzle base 31, includes two sloped sidewalls 311 and two parallel sidewalls 312 that are connected to each other. The inclined side wall 311 and the parallel side wall 312 extend along the Z direction. The parallel side wall 312 is adjacent the outlet opening 34 and the inclined side wall 311 is adjacent the inlet opening. The parallel sidewalls 312 are perpendicular to the Y-axis. The included angle between the oblique rib section 351 and the connected parallel side wall 312 is an obtuse angle; the included angle a between the two inclined side walls 311 is greater than 90 degrees and less than or equal to 150 degrees.

In order to further improve the rectification and diffusion effects, an air inlet hole 331 in the form of a conical hole is arranged at the air inlet 33. The axis of inlet hole 331 is on a parallel with the X direction, and in the direction of the side of following the side of admitting air and pointing to the side of giving vent to anger, the diameter of inlet hole 331 increases gradually to realize even diffusion, and be favorable to the setting of equal muscle section 353 that divides.

Referring to fig. 10, 11 and 12, the Z-dimension h (see fig. 10) of the outlet 34 is set as follows:

0.4mm＜h＜0.6mm。

for example, the dimension h in the Z direction of the outlet 34 is set equal to 0.5 mm. As for the length setting of the outlet, it may be set based on the height, and for example, the ratio of the length (i.e., the dimension in the Y direction) to the height (the dimension in the Z direction) of the outlet may be set to 10:1 or more. For example, set to 10: 1; 12: 1; 15: 1; or even 20: 1, etc. The length setting of the outlet may also be set with reference to the size of the window, for example to be equal or substantially equal to the Y-dimension of the window. In the X direction, the first air outlet end surface 341 of the air nozzle base 31 protrudes from the second air outlet end surface 342 of the air nozzle cover plate 32, and the protruding distance f is greater than or equal to 1 mm. That is, in the X direction, the upper edge of the outlet protrudes beyond the lower edge of the outlet, thereby facilitating the consumption of the compressed air flow by spreading upward. Alternatively, the diffusion of the pressing air flow in a direction deviating from the viewing window is facilitated. For example, in the case where the planar window is vertically disposed, the Z direction of the above-defined coordinate system is no longer one direction with the up-down direction in the natural coordinate system. The Z direction is a horizontal direction in the natural coordinate system, and specifically, a direction perpendicular to the planar window and away from the planar window.

In one embodiment, as shown, the Z-direction upper wall 381 and the Z-direction lower wall 382 of the straightening plenum 38 are angled in the range of 3 to 7. This is advantageous for increasing the air flow rate at the air outlet. For example, the angle between the Z-direction upper wall 381 and the Z-direction lower wall 382, and the angle e between the plane defined by the Z-direction upper wall 381 and the plane defined by the Z-direction lower wall 382 are 4 °, 5 °, or 6 °.

The structural design of above-mentioned air cock for can furthest keep realizing the air current rectification under the prerequisite of the initial atmospheric pressure value of pulse air current, avoid the loss, improve the clean efficiency of blowing off the form, reduce the module volume, improve the self-cleaning module and be compatible on different products. According to the air nozzle for cleaning the camera window, the efficiency of cleaning the window can be improved in an air jet mode, the camera window can be prevented from being damaged, the cleaning mode is wide in application range, and the air nozzle is suitable for plane windows and spherical covers and special-shaped plane windows.

Embodiments of the present invention also provide a camera comprising an air tap as described above for cleaning a camera window and/or an air jet cleaning system as described above.

Specifically, as shown in fig. 12, the camera according to an embodiment of the present invention has a camera window and an air faucet 3. The gas nozzle 3 has a rectification gas chamber 38, a gas inlet 33 on the gas inlet side of the rectification gas chamber 38, and a gas outlet 34 on the gas outlet side of the rectification gas chamber 38, wherein a three-dimensional coordinate system is established in the following manner: the direction pointing from the air inlet side to the air outlet side is the X direction, the length direction of the air outlet 34 is the Y direction, the direction perpendicular to the X direction and the Y direction is the Z direction, and the air outlet 34 of the air tap 3 is aligned with the camera window.

The length direction of the air outlet refers to the longitudinal direction of the air outlet. The air outlet can be understood as the air outlet end of the rectification air chamber in general. The shape of the outlet port is substantially rectangular as viewed from the outlet side, but the shape of the outlet port is not limited to rectangular. For example, for a hemispherical window, a larger Z dimension may be provided at the middle of the outlet, while a smaller Z dimension may be provided at the ends.

For the illustrated embodiment in which the camera window is a planar window 4, the length of the air nozzle 3 may be arranged parallel to the plane defined by the outer surface of the planar window 4.

Referring to FIG. 12, the Z-directed lower wall 382 of the fairing plenum 38 defines a plane parallel to the plane defined by the outer surface of the planar viewing window, and the included angle between the Z-directed upper wall and the Z-directed lower wall of the fairing plenum is in the range of 3 to 7. As shown in fig. 12, the Z-lower wall 382 is actually an upper surface of the air nozzle cover plate 32. The Z-direction upper wall 381 is actually the lower surface of the air nozzle base 31.

In one embodiment, the intersection of the plane defined by Z-directed upper wall 381 of the fairing plenum 38 and the plane defined by the outer surface of the planar viewing window is less than or equal to 1/3 of the maximum radial dimension of the planar viewing window from the center point of the planar viewing window. This facilitates directing the cleaning air flow mainly to the middle of the viewing window, thereby improving the efficiency of the cleaning.

In an alternative embodiment, the intersecting line of the plane defined by the Z-direction upper wall of the rectification air chamber and the plane defined by the outer surface of the plane window is positioned on one side of the center point of the plane window, which is adjacent to the air outlet. This facilitates a more efficient use of the kinetic energy of the air flow.

Referring to fig. 12, the plane defined by the Z-directed lower wall of the straightening plenum is higher in the Z-direction than the plane defined by the outer surface of the planar viewing window, and a guide slope 321 is provided at a position of the Z-directed lower wall of the straightening plenum adjacent to the outlet vent 34, the guide slope 321 being inclined to the plane defined by the planar viewing window. Therefore, airflow is properly diffused at the air outlet, and the direct coverage area of the airflow is increased. The guide slope 321 may be disposed parallel to a plane defined by the Z-direction upper wall. Or may be disposed at a slight angle, such as 1-3 degrees, relative to the plane defined by the Z-direction upper wall, thereby forming a superflared opening. Outward here means toward the outside of the rectification air chamber.

In an alternative embodiment, the intersection line between the guiding bevel 321 and the plane defined by the planar viewing window is adjacent to the edge of the planar viewing window in the-X direction (negative X direction).

The X-direction distance g between the edge of the air tap 3 and the plane window can be set according to the requirement. Optionally, an X-direction distance g between the edge of the air tap 3 and the planar window is greater than or equal to 0 and less than or equal to 1.5 cm. For example, g is set equal to 1 cm. Thereby improving the compactness of the whole structure and improving the utilization efficiency of the airflow.

The camera view can also be a hemispherical view. The camera view window is a hemispherical view window, and the intersection line of a plane defined by the Z-direction upper wall 381 of the rectifying air chamber 38 and a tangent plane defined at the protruding vertex of the outer surface of the hemispherical view window is less than or equal to 1/5 of the radius of the hemispherical view window. Thereby, the air flow is intensively guided to the protruding apex, and the cleaning efficiency is improved.

As mentioned above, for the hemispherical window, the shape of the outlet can be optimized, i.e. a larger Z-dimension is provided at the middle of the outlet and a smaller Z-dimension is provided at the two ends.

Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Those of ordinary skill in the art will understand that: modifications can be made to the technical solutions described in the foregoing embodiments, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. An air injection system for a camera window, comprising: an air pump (112), an air tap (3) and an air bag (135),

the gas pump (112) is used for pumping gas,

the gas nozzle (3) is used for receiving gas from the gas pump (112) and guiding the gas to a camera window so as to clean the camera window,

the air bag (135) is an elastic air bag, and on an air path, the air bag (135) is arranged between the air pump (112) and the air tap (3).

2. A gas injection system for a camera window as claimed in claim 1, wherein the gas injection system further comprises: the air inlet end of the air bag (135) is communicated with the air passage of the air pump (112), and the air outlet end of the air bag (135) is communicated with the air passage of the air tap (3) through the electromagnetic valve (14).

3. A gas injection system for a camera window as claimed in claim 2, wherein the gas injection system further comprises: an air inlet pipe (12) and an air outlet pipe (2),

the air bag (135) is communicated with the air pump (112) through an air inlet pipe (12), the air outlet end of the air bag (135) is directly communicated with one end of the electromagnetic valve (14), and the other end of the electromagnetic valve (14) is communicated with the air tap (3) through the air outlet pipe (2).

4. A gas injection system for a camera window as claimed in claim 3, characterized in that the gas injection system further comprises: an air pump upper cover (111), an air pump lower cover (116),

the air pump upper cover (111) and the air pump lower cover (116) are fixedly connected with each other, an air pump accommodating space is limited, and the air pump (112) is arranged in the air pump accommodating space.

5. A gas injection system for a camera window as claimed in claim 4, characterized in that the gas injection system further comprises: shock pad (113) and air pump support (114), air pump support (114) set up in the air pump accommodation space, and fixed mounting extremely air pump lower cover (116) or air pump upper cover (111), shock pad (113) set up air pump (112) with between air pump support (114), just air pump (112) are fixed extremely air pump support (114).

6. A gas injection system for a camera window according to any one of claims 1 to 5, wherein the gas injection system further comprises: an air bag upper cover (131) and an air bag lower cover (134),

the air bag upper cover (131) and the air bag lower cover (134) are fixedly connected with each other and limit an air bag accommodating space, and the air bag (135) and the electromagnetic valve (14) are arranged in the air bag accommodating space.

7. Air injection system for a camera window according to claim 6, characterized in that an air bag sealing ring (133) is arranged at the connection of the air inlet end of the air bag (135) and the air inlet pipe (12).

8. An air injection system for a camera window according to any one of claims 1 to 5, characterized in that the maximum withstand air pressure of the air bag (135) is equal to or greater than the maximum operating static pressure of the air pump (112).

9. An air injection system for a camera window according to any one of claims 1 to 5, characterized in that the air nozzle (3) comprises:

a nozzle cavity defining a rectification plenum (38);

an air inlet (33) located on an air inlet side of the rectifying air chamber (38) and communicated with the air inlet side of the rectifying air chamber (38), wherein the cross section of the air inlet (33) is circular;

an air outlet (34) which is positioned at the air outlet side of the rectification air chamber (38) and is communicated with the air outlet side of the rectification air chamber (38);

wherein, a three-dimensional coordinate system is established in the following way: the direction from the air inlet side to the air outlet side is the X direction, the length direction of the air outlet (34) is the Y direction, the direction vertical to the X direction and the Y direction is the Z direction,

the size of the rectification air chamber (38) in the Y direction is gradually increased from the air inlet side to the air outlet side in the X direction; the dimension in the Z direction gradually decreases.

10. The air injection system for camera windows according to claim 9, characterized in that two vertical ribs (35) are provided in the air nozzle cavity, the vertical ribs (35) extending in the Z direction dividing the rectifying air chamber into three sub-chambers, each sub-chamber extending from the air inlet (33) to the air outlet (34),

the two vertical ribs (35) are symmetrical about an X-Z plane dividing the rectification air chamber.

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