Spherical cleaning device

Abstract

The present application relates to the technical field of radar sensor surface cleaning, and particularly relates to a spherical surface cleaning device, which comprises a nozzle device, the nozzle device comprises a flow channel unit, a first fluid introduction channel, a second fluid introduction channel and a spray port, the flow channel unit comprises a first flow channel, a second flow channel and a third flow channel which are sequentially communicated, the cross-sectional area of the second flow channel gradually increases along the first flow channel to the third flow channel, the cross-sectional area of the third flow channel gradually increases along the second flow channel to the spray port, and the cross-sectional area of the second flow channel is smaller than that of the third flow channel. The spherical surface cleaning device has both water spraying and air spraying functions, does not need to deploy additional nozzle devices, effectively reduces the space occupancy ratio, and the nozzle device is attached to the spherical outer contour surface of the sensor sensing area, so that the space occupancy ratio can be further reduced, and the appearance surface of the nozzle device has no obvious protrusion and is not easy to be damaged by knocking.

Description

Technical Field

[0001] This invention relates to the field of radar sensor surface cleaning technology, and more particularly to a spherical cleaning device. Background Technology

[0002] Radar sensors are common sensors used in vehicles to detect the environment around the vehicle and obtain information about its surroundings. However, when radar sensors are obstructed by water, fog, frost, mud, insects, or other contaminants, the point cloud data becomes distorted, rendering them inoperable. Applying this type of radar sensor to autonomous driving could lead to safety accidents.

[0003] Many radar sensors have a spherical sensing area. Currently, most of these radar sensors on the market do not have a device for cleaning the sensing surface. A small number of these sensors have a protruding water spray nozzle on the sensing surface. This nozzle needs to spray a large amount of cleaning fluid onto the sensing surface during cleaning, which will continuously block the sensing surface during the cleaning process. This will cause the radar sensor to malfunction during cleaning. Furthermore, after cleaning, a lot of cleaning fluid will remain on the sensing surface. This cleaning fluid will not only block the sensing area of ​​the radar sensor, but will also attract dust from the environment, causing secondary pollution. To address the issue of cleaning fluid residue, existing technologies have improved water spray nozzle devices by replacing them with raised air jet nozzles that combine water and air spraying functions. The working principle involves applying air jets after the cleaning fluid is sprayed to remove any remaining residue. However, these raised air jet nozzles have a complex structure and typically require numerous nozzles to address the residue issue, making them more susceptible to damage from impacts. Furthermore, their large size makes them inconvenient to deploy and install, and unsuitable for layouts with high space requirements.

[0004] Therefore, the present invention provides a spherical cleaning device. Summary of the Invention

[0005] Therefore, it is necessary to provide a spherical cleaning device to address the aforementioned technical problems.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A spherical cleaning device includes a nozzle assembly that is fitted to the spherical outer contour surface of a sensor sensing area. The nozzle assembly contains a flow channel unit for facilitating the flow of pressurized liquid and / or pressurized gas and accelerating the pressurized liquid and / or pressurized gas; a first fluid inlet channel connected to the flow channel unit; and a second fluid inlet channel connected to the first fluid inlet channel. The first fluid inlet channel is used to deliver pressurized liquid and / or pressurized gas into the flow channel unit, and the second fluid inlet channel is used to deliver pressurized liquid into the first fluid inlet channel. The nozzle assembly has a spray nozzle connected to the flow channel unit. The flow channel unit includes a first flow channel, a second flow channel, and a third flow channel connected sequentially. The cross-sectional area of ​​the second flow channel gradually increases from the first flow channel to the third flow channel, and the cross-sectional area of ​​the third flow channel gradually increases from the second flow channel to the spray nozzle. The cross-sectional area of ​​the second flow channel is smaller than that of the third flow channel.

[0008] In some alternative implementations of some embodiments, the nozzle device includes a nozzle body, which is an annular structure with an inner spherical surface that fits against the spherical outer contour surface of the sensor sensing area. The lower end of the nozzle body is provided with a boss for positioning and mounting with the sensor housing structure.

[0009] In some alternative implementations of some embodiments, the first flow channel is disposed on the nozzle body, and the first flow channel is a strip structure for conveying pressurized liquid and / or pressurized gas along the length extension direction of the nozzle body.

[0010] In some optional implementations of some embodiments, the second flow channel and the third flow channel are both disposed on the nozzle body, and the number of the second flow channel and the third flow channel is at least one. Each second flow channel is connected to the first flow channel and a third flow channel respectively. The multiple second flow channels and the third flow channels are arranged along the length extension direction of the nozzle body, and the third flow channel has a fan-shaped expansion structure.

[0011] In some alternative implementations of some embodiments, one end of the first fluid inlet channel is connected to a pressurized gas source and the other end is connected to the input end of the first flow channel; one end of the second fluid inlet channel is detachably connected to a valve body unit and the other end is connected to the first fluid inlet channel.

[0012] In some alternative implementations of certain embodiments, the nozzle device further includes a cover plate that is clearance-fitted with the nozzle body to form a flow channel unit.

[0013] In some alternative implementations of certain embodiments, the valve body unit includes a valve seat and a check structure disposed at the valve seat output end to prevent backflow of pressurized liquid or pressurized gas.

[0014] In some optional implementations of some embodiments, the valve seat has a cylindrical connecting section at one end facing the second fluid inlet channel, the valve seat has a third fluid inlet channel inside, and a fourth fluid inlet channel communicating with the third fluid inlet channel is opened on the cylindrical connecting section. The check valve is made of an elastic material and is sleeved on the cylindrical connecting section.

[0015] In some alternative implementations of certain embodiments, the check valve is a cylindrical ring structure, and the inner diameter of the check valve is smaller than the diameter of the cylindrical connecting segment.

[0016] In some optional implementations of some embodiments, the injection port is disposed at the upper end of the third flow channel, the injection port is arranged facing the spherical outer contour surface of the sensor sensing area, and the injection port is in contact with the spherical outer contour surface of the sensor sensing area.

[0017] The advantages and beneficial effects of this invention are as follows: The spherical cleaning device provided by this invention, by setting a first fluid inlet channel, a second fluid inlet channel, a flow channel unit and a spray nozzle, can use different cleaning modes according to different cleaning needs, making cleaning more efficient and convenient; compared with traditional water spray nozzle devices, this device consumes less cleaning fluid; in addition, this device has both water spraying and air spraying functions, eliminating the need to deploy additional nozzle devices, effectively reducing space occupancy; furthermore, the nozzle device fits the spherical outer contour surface of the sensor sensing area, further reducing space occupancy; at the same time, the nozzle device has no obvious protrusions on its surface, making it less prone to bumps and damage. Attached Figure Description

[0018] Figure 1 This is an assembly diagram of the sensor arc-shaped outer surface cleaning device and the radar sensor in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the nozzle device in an embodiment of the present invention.

[0020] Figure 3 This is an angled cross-sectional view of the nozzle device in an embodiment of the present invention.

[0021] Figure 4 This is a cross-sectional view of the nozzle device in an embodiment of the present invention from another angle.

[0022] Figure 5 This is a schematic diagram of the nozzle body in an embodiment of the present invention.

[0023] Figure 6 This is a top view of the nozzle body in an embodiment of the present invention.

[0024] Figure 7This is a schematic diagram of the valve seat structure in an embodiment of the present invention.

[0025] Reference numerals: Nozzle body 1, cover plate 2, valve body unit 3, boss 4, flow channel unit 5, first fluid inlet channel 6, second fluid inlet channel 7, first flow channel 8, second flow channel 9, third flow channel 10, valve seat 11, check valve structure 12, cylindrical connecting section 13, third fluid inlet channel 14, fourth fluid inlet channel 15, spherical outer contour surface of sensor sensing area 16, inner spherical surface 17, injection port 18, positioning groove 19. Detailed Implementation

[0026] The embodiments of this application will now be described in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, the following embodiments and features can be combined with each other unless otherwise specified. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] like Figures 1-7 As shown, a spherical cleaning device includes a nozzle device that is fitted to the spherical outer contour surface 16 of the sensor sensing area. The nozzle device is provided with a flow channel unit 5 for the flow of pressurized liquid and / or pressurized gas and for accelerating the pressurized liquid and / or pressurized gas, a first fluid inlet channel 6 connected to the flow channel unit 5, and a second fluid inlet channel 7 connected to the first fluid inlet channel 6. The first fluid inlet channel 6 is used to deliver pressurized liquid and / or pressurized gas into the flow channel unit 5, and the second fluid inlet channel 7 is used to deliver pressurized liquid into the first fluid inlet channel 6. The nozzle device is provided with a spray port 18 connected to the flow channel unit 5. The flow channel unit 5 includes a first flow channel 8, a second flow channel 9, and a third flow channel 10 connected in sequence. The cross-sectional area of ​​the second flow channel 9 gradually increases from the first flow channel 8 to the third flow channel 10, and the cross-sectional area of ​​the third flow channel 10 gradually increases from the second flow channel 9 to the spray port 18. The cross-sectional area of ​​the second flow channel 9 is smaller than the cross-sectional area of ​​the third flow channel 10.

[0029] In one possible implementation, this application can use different cleaning modes to clean different types of dirt according to different cleaning needs, making cleaning more efficient and faster. For example, when cleaning water droplets in the sensor sensing area, pressurized gas can be applied. This pressurized gas enters the first fluid inlet channel 6 through the first fluid inlet channel 6, and is transported along the length of the nozzle device in the first flow channel 8. Then, it is introduced into the second flow channel 9 through the first flow channel 8, accelerated in the second flow channel 9, and then introduced into the third flow channel 10 through the second flow channel 9, accelerated again in the third flow channel 10, to obtain high-speed pressurized gas. Finally, the high-speed pressurized gas is ejected through the spray nozzle 18, achieving the purpose of cleaning the sensor sensing area using high-speed pressurized gas. As another example, when sludge adheres to the sensor sensing area, it can first be introduced into the second fluid inlet channel... 7. Pressurized liquid is introduced, followed by pressurized gas through the first fluid introduction channel 6. In the first fluid introduction channel 6, the pressurized liquid and pressurized gas mix to form a water mist. The water mist is introduced into the second channel 9 through the first flow channel 8, where it is accelerated. It is then introduced into the third channel 10 through the second flow channel 9 and accelerated again through the third flow channel 10 to obtain a high-speed water mist. Finally, the high-speed water mist is ejected through the nozzle 18, which can clean the sensor sensing area using high-speed water mist. Subsequently, pressurized gas is introduced multiple times to clean the residual liquid in the sensor sensing area using a separate jet method, so as to complete the cleaning operation of the sensor sensing area. In addition, when cleaning liquid substances in the sensor sensing area, the liquid substances in the sensor sensing area can be cleaned by introducing pressurized gas separately, without consuming cleaning fluid, which can effectively reduce the consumption of cleaning fluid.

[0030] In one possible implementation, the cross-sectional area of ​​the second flow channel 9 involved in this application is smaller than the cross-sectional area of ​​the third flow channel 10. That is, the front part of the flow channel unit 5 is a strip-shaped first flow channel 8, which is used to transport pressurized liquid and / or pressurized gas along the length extension direction of the nozzle device. The middle part of the flow channel unit 5 is the second flow channel 9, the cross-section of which gradually increases. After passing through the second flow channel 9, it enters the fan-shaped expansion structure of the third flow channel 10, the cross-section of which also gradually increases. Furthermore, the cross-sectional area of ​​the second flow channel 9 is smaller than the cross-sectional area of ​​the third flow channel 10, and finally it is ejected at high speed from the injection port 18. Pressurized liquid and / or pressurized gas flow into the first flow channel 8 under high pressure, pass through the second flow channel 9 and the third flow channel 10 in sequence, and exit from the nozzle 18. The working principle of this structural design is that the speed of the pressurized liquid and / or pressurized gas can be changed by the change of the spray cross-sectional area, so that the pressurized liquid and / or pressurized gas can be accelerated from low speed to medium speed, and then from medium speed to high speed, forming high-speed pressurized liquid and / or pressurized gas, which is finally ejected from the nozzle 18, so as to achieve rapid cleaning of the sensor sensing area.

[0031] In one possible implementation, such as Figure 3-6 As shown, the nozzle device includes a nozzle body 1, which is a ring-shaped structure. The nozzle body 1 has an inner spherical surface 17, which is in contact with the spherical outer contour surface 16 of the sensor sensing area. The lower end of the nozzle body 1 is provided with a boss 4 for positioning and mounting with the sensor housing structure.

[0032] In one possible implementation, the inner spherical surface 17 of the nozzle body 1 is fitted with the spherical outer contour surface 16 of the sensor sensing area, thus requiring only a small amount of space for installation, making the installation process less difficult and having little impact on the appearance of the lidar. In addition, a boss 4 is provided at the lower end of the nozzle body 1 to facilitate the positioning of the nozzle body 1 and the sensor housing structure. Meanwhile, the connection between the nozzle device and the sensor can be achieved by screw connection. Before assembling the two, the nozzle body 1 of the nozzle device needs to be fitted onto the sensor first, and then the boss 4 at the lower end of the nozzle body 1 is snapped onto the upper end surface of the sensor housing structure. Finally, the two are fixed with screws to achieve the assembly and installation of the nozzle device and the sensor.

[0033] In one possible implementation, such as Figure 5-6 As shown, the first flow channel 8 is disposed on the nozzle body 1. The first flow channel 8 is a strip structure and is used to convey pressurized liquid and / or pressurized gas along the length extension direction of the nozzle body 1.

[0034] In one possible implementation, to improve the spraying effect, multiple flow channel units 5 can be provided on the nozzle body 1, and the flow channel units 5 are arranged along the length extension direction of the nozzle body 1 to achieve a circumferential distribution along the radar sensor. This enables 360° comprehensive cleaning coverage of the sensor's sensing area in the circumferential direction of the radar sensor, ensuring a cleaning effect. Furthermore, the number of flow channel units 5 can be arranged according to actual needs, such as... Figure 5-6 As shown, the number of flow channel units 5 in this application is 2, the number of first flow channels 8 in each flow channel unit 5 is 2, the number of second flow channels 9 in each flow channel unit 5 is 6, and the number of third flow channels 10 in each flow channel unit 5 is 6.

[0035] In one possible implementation, such as Figure 5-6 As shown, the second flow channel 9 and the third flow channel 10 are both provided on the nozzle body 1. There is at least one second flow channel 9 and a third flow channel 10. Each second flow channel 9 is connected to the first flow channel 8 and a third flow channel 10 respectively. Multiple second flow channels 9 and third flow channels 10 are arranged along the length extension direction of the nozzle body 1. The third flow channel 10 has a fan-shaped expansion structure.

[0036] In one possible implementation, one end of the first fluid inlet channel 6 is connected to a pressurized gas source, and the other end is connected to the input end of the first flow channel 8. One end of the second fluid inlet channel 7 is detachably connected to a valve body unit 3, and the other end is connected to the first fluid inlet channel 6. Both the first fluid inlet channel 6 and the second fluid inlet channel 7 can be set on the nozzle body 1 or on the cover plate 2, and can be selected according to the actual situation, as long as the pressurized liquid and / or pressurized gas are delivered into the first flow channel.

[0037] In one possible implementation, the nozzle device further includes a cover plate 2, which is clearance-fitted with the nozzle body 1 to form a flow channel unit 5.

[0038] In one possible implementation, the cover plate 2 has an arc-shaped annular structure, such as... Figure 2-3 As shown, the connection between the nozzle body 1 and the cover plate 2 can be achieved by screws, or other connection methods can be used, such as welding the nozzle body 1 and the cover plate 2 into a whole using ultrasonic welding technology. This not only effectively reduces the number of parts, but also improves the sealing between the nozzle body 1 and the cover plate 2. The connection method between the nozzle body 1 and the cover plate 2 can be selected according to actual needs, and is not limited here. In addition, to ensure the positioning accuracy between the nozzle body 1 and the cover plate 2, a positioning groove 19 can be provided on the nozzle body 1, and a positioning block matching the positioning groove 19 can be provided on the cover plate 2.

[0039] In one possible implementation, if the connection between the nozzle body 1 and the cover plate 2 is made by screw connection, a sealing body for sealing the flow channel unit 5 can be provided between the nozzle body 1 and the cover plate 2, such as a rubber gasket. A sealing body can be provided around the outer contour of the flow channel unit 5. A sealing strip or sealant can also be provided between the nozzle body 1 and the cover plate 2 for sealing. The choice can be made according to the specific situation and will not be limited here.

[0040] In one possible implementation, such as Figure 3-4 As shown, the valve body unit 3 includes a valve seat 11 and a check structure 12 disposed at the output end of the valve seat 11 to prevent backflow of pressurized liquid or pressurized gas.

[0041] In one possible implementation, the valve body unit 3 consists of a valve seat 11 and a check structure 12, wherein the check structure 12 can prevent pressurized liquid or pressurized gas from flowing back into the valve seat 11.

[0042] In one possible implementation, such as Figure 7As shown, the valve seat 11 has a cylindrical connecting section 13 at one end facing the second fluid inlet channel 7, and a third fluid inlet channel 14 is provided inside the valve seat 11. A fourth fluid inlet channel 15 connected to the third fluid inlet channel 14 is opened on the cylindrical connecting section 13. The check structure 12 is made of elastic material and is sleeved on the cylindrical connecting section 13.

[0043] In one possible implementation, pressurized liquid can enter the fourth fluid inlet channel 15 through the third fluid inlet channel 14, and then enter the second fluid inlet channel 7 through the fourth fluid inlet channel 15. Under pressure, the liquid can push open the check structure 12 sleeved on the fourth fluid inlet channel 15 and enter the second fluid inlet channel 7.

[0044] In one possible implementation, the check valve 12 is a cylindrical ring structure, and the inner diameter of the check valve 12 is smaller than the diameter of the cylindrical connecting section 13.

[0045] In one possible implementation, the check valve 12 may be a rubber sleeve that is clamped onto the cylindrical connecting section 13 of the valve seat 11 and completely seals the outlet of the fourth fluid inlet channel 15 to prevent backflow.

[0046] In one possible implementation, the injection port 18 is disposed at the upper end of the third flow channel 10, the injection port 18 is arranged facing the spherical outer contour surface 16 of the sensor sensing area, and the injection port 18 is in contact with the spherical outer contour surface 16 of the sensor sensing area.

[0047] The working principle of this invention is as follows: First, based on actual production needs, the connection method between the nozzle body 1 and the cover plate 2 is selected. Then, based on the connection method, it is determined whether a sealing unit needs to be assembled between them. Next, the nozzle body 1 of the nozzle device is fitted onto the sensor. Then, the protrusion 4 at the lower end of the nozzle body 1 is clipped onto the upper surface of the sensor housing structure. Finally, screws are used to fix the two together, realizing the assembly and installation between the nozzle device and the sensor. Then, the first fluid inlet channel 6 is connected to the corresponding pressurized gas source, and the second fluid inlet channel 7 is threadedly connected to the valve body unit 3 (an external thread section is provided on the valve seat 11, and an internal thread section matching the external thread section is provided on the second fluid inlet channel 7). The valve body unit 3 and the corresponding... It can be connected to a pressure liquid source; different cleaning modes can be used according to the cleaning needs of the sensor sensing area. For example, when cleaning water droplets in the sensor sensing area, pressurized gas can be applied to clean the sensor sensing area using the airflow of pressurized gas; if sludge is attached to the sensor sensing area, pressurized liquid can be applied first, followed by pressurized gas to form a water mist sprayed out, using the water mist to wash away the sludge in the sensor sensing area. Then, pressurized gas (such as drying gas) can be introduced multiple times to clean the residual liquid in the sensor sensing area using a separate jet method, so as to complete the cleaning operation of the sensor sensing area. Multiple cleaning modes can be realized to meet various cleaning needs of the sensor sensing area, making the cleaning of the sensor sensing area more efficient and convenient.

[0048] Obviously, those skilled in the art will understand that the various steps of the present invention described above can be performed in a manner different from that described above, and the simulation methods and experimental equipment include, but are not limited to, the above description. The steps of the present invention described above can be performed in a different order in certain circumstances, and the steps shown or described above can be performed separately. Therefore, the present invention is not limited to any particular combination of hardware and software.

[0049] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered within the scope of protection of the present invention.

Claims

1. A spherical cleaning device, comprising a nozzle assembly, the nozzle assembly comprising a nozzle body, characterized in that, The nozzle device is attached to the spherical outer contour surface of the sensor sensing area. The nozzle device is provided with a flow channel unit for the flow of pressurized liquid and / or pressurized gas and for accelerating the pressurized liquid and / or pressurized gas, a first fluid inlet channel connected to the flow channel unit, and a second fluid inlet channel connected to the first fluid inlet channel. The first fluid inlet channel is used to deliver pressurized liquid and / or pressurized gas into the flow channel unit, and the second fluid inlet channel is used to deliver pressurized liquid into the first fluid inlet channel. The nozzle device is provided with a spray port connected to the flow channel unit. The nozzle device includes a cover plate, and the cover plate and the nozzle body are fitted with a clearance to form a flow channel unit. Multiple flow channel units are provided on the nozzle body. The flow channel units are arranged along the length extension direction of the nozzle body. The flow channel unit includes a first flow channel, a second flow channel, and a third flow channel connected in sequence. The first flow channel is provided on the nozzle body. Both the second and third flow channels are disposed on the nozzle body. There are multiple second and third flow channels. Each second flow channel is connected to the first flow channel and one third flow channel. The multiple second and third flow channels are arranged along the length extension direction of the nozzle body. The third flow channel has a fan-shaped expansion structure. The cross-sectional area of ​​the second flow channel gradually increases from the first flow channel to the third flow channel. The cross-sectional area of ​​the third flow channel gradually increases from the second flow channel to the injection port. The cross-sectional area of ​​the second flow channel is smaller than that of the third flow channel. The front part of the flow channel unit is a strip-shaped first flow channel, which is used to transport pressurized liquid and / or pressurized gas along the length extension direction of the nozzle device. The middle part of the flow channel unit is the second flow channel. The cross-section of the second flow channel increases from small to large. After passing through the second flow channel, it enters the fan-shaped expansion structure of the third flow channel. The cross-section of the third flow channel increases from small to large. The cross-sectional area of ​​the second flow channel is smaller than that of the third flow channel. Finally, it is ejected at high speed from the injection port.

2. The spherical cleaning device according to claim 1, characterized in that, The nozzle body has a ring-shaped structure and an inner spherical surface. The inner spherical surface fits into the spherical outer contour surface of the sensor sensing area. The lower end of the nozzle body is provided with a boss for positioning and mounting with the sensor housing structure.

3. The spherical cleaning device according to claim 1, characterized in that, One end of the first fluid inlet channel is connected to a pressurized gas source, and the other end is connected to the input end of the first flow channel. One end of the second fluid inlet channel is detachably connected to a valve body unit, and the other end is connected to the first fluid inlet channel.

4. The spherical cleaning device according to claim 3, characterized in that, The valve body unit includes a valve seat and a check structure disposed at the output end of the valve seat to prevent backflow of pressurized liquid or pressurized gas.

5. A spherical cleaning device according to claim 4, characterized in that, The valve seat has a cylindrical connecting section at one end facing the second fluid inlet channel, the valve seat has a third fluid inlet channel inside, and a fourth fluid inlet channel connected to the third fluid inlet channel is opened on the cylindrical connecting section. The check valve is made of elastic material and is sleeved on the cylindrical connecting section.

6. A spherical cleaning device according to claim 5, characterized in that, The check valve structure is a cylindrical ring structure, and the inner diameter of the check valve structure is smaller than the diameter of the cylindrical connecting section.

7. A spherical cleaning device according to claim 1, characterized in that, The injection port is located at the upper end of the third flow channel. The injection port is arranged facing the spherical outer contour surface of the sensor sensing area, and the injection port is in contact with the spherical outer contour surface of the sensor sensing area.

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