Self-cleaning ultrasonic sensing device

Abstract

The invention relates to the field of ultrasonic probe detection, in particular to a self-cleaning ultrasonic sensing device which comprises an ultrasonic probe, an ultrasonic sensor and a controller. The scraping assembly is configured to be in contact with the ultrasonic probe and remove liquid attached to the surface of the ultrasonic probe when the scraping assembly moves relative to the ultrasonic probe; the water mist on the surface of the probe is periodically scraped by arranging the scraping assembly, so that the problem that ultrasonic signals are attenuated or distorted due to the fact that the water mist is easily condensed on the surface of the ultrasonic probe is solved, the detection surface is clean, and the signal transmission reliability is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic probe testing technology, and more particularly to a self-cleaning ultrasonic sensing device. Background Technology

[0002] In hot water supply systems, the operating efficiency of equipment such as pumps, heat exchangers, and boilers is closely related to flow rate. By monitoring real-time flow rate, it is possible to determine whether the equipment is operating at its rated condition and whether there is inefficient operation or malfunction risk due to excessive or insufficient flow. In heating equipment such as coffee machines and boilers, flow detection is an important safety interlock condition. When the flow rate is detected to be below the safety threshold, the heating source can be automatically cut off to prevent the equipment from dry burning due to lack of water or insufficient water flow, thus preventing equipment damage or even fire accidents.

[0003] Currently, coffee machines generally use flow meters to detect liquid volume. Flow meters are not very accurate and the detection results are inaccurate. Boilers often use probes to detect liquid volume, but probes can only detect whether there is liquid or not, but cannot accurately detect the liquid level, and the response is slow.

[0004] Ultrasonic sensors can accurately measure water levels down to 1 ml. However, in high-temperature, high-humidity, and enclosed environments, the high temperature of hot water can cause water vapor to form, which easily condenses on the surface of the ultrasonic probe. This water vapor contaminates the probe, leading to attenuation or distortion of the ultrasonic signal, severely affecting measurement accuracy and equipment stability, and resulting in inaccurate measurements. To address this issue, current technologies often employ methods such as coating the probe surface or blowing away the water vapor. However, coatings are only suitable for environments with small amounts of water vapor, and blowing away the water vapor can also easily contaminate the probe surface, affecting measurement accuracy. Summary of the Invention

[0005] To address the shortcomings of the prior art, the present invention aims to provide a self-cleaning ultrasonic sensing device. By incorporating a scraping component to periodically remove water mist from the probe surface, the device solves the problem of water mist condensing on the ultrasonic probe surface, which leads to ultrasonic signal attenuation or distortion, ensuring a clean detection surface and effectively improving signal transmission reliability.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: The self-cleaning ultrasonic sensor includes: An ultrasonic probe configured to detect liquid flow rate; A scraping assembly configured to contact the ultrasonic probe and remove liquid adhering to the surface of the ultrasonic probe during movement relative to the ultrasonic probe.

[0007] The above solution uses a scraping component to remove the water mist from the ultrasonic probe installed inside a heating device such as a coffee machine or boiler. Since the ultrasonic probe is in a high-temperature, high-humidity, and enclosed space, water mist will adhere to its surface. When the scraping component is activated, it makes close contact with the surface of the ultrasonic probe during its movement, thereby removing the water mist and preventing the ultrasonic probe from being contaminated, resulting in high accuracy of the detection results.

[0008] Furthermore, it also includes a housing, inside which a mounting base is provided, and the mounting base has a mounting hole, into which the ultrasonic probe is connected; The scraping assembly includes an electromagnetic push rod connected to the housing and a scraper connected to the output shaft of the electromagnetic push rod. The upper surface of the scraper abuts against the lower surface of the ultrasonic probe, and the electromagnetic push rod is used to drive the scraper to slide within the mounting base.

[0009] The housing is installed at the hot water pipe. After the ultrasonic probe has been used for a period of time, the electromagnetic push rod is activated. The output shaft of the electromagnetic push rod pushes the scraper to slide within the mounting base. The upper surface of the scraper abuts against the lower surface of the ultrasonic probe. When the scraper moves to the edge of the ultrasonic probe, it begins to push away the water mist on the probe. The upper surface of the scraper covers the lower surface of the ultrasonic probe, thus pushing all the water mist onto the probe and collecting it into a water flow. The scraper moves from one end of the ultrasonic probe to the other, meaning it completely passes over the lower surface of the ultrasonic probe, thus scraping and pushing the water mist away from the probe. The water flow runs down from the end of the scraper and away, removing the water mist from the ultrasonic probe and improving its detection accuracy. After the electromagnetic push rod pushes the scraper past the ultrasonic probe, it returns the scraper to its original position. Repeating the above steps allows the water mist on the surface of the ultrasonic probe to be scraped away at regular intervals.

[0010] Furthermore, the top of the scraper is provided with a scraping part, which is located at one end of the scraper near the ultrasonic probe. The upper surface of the scraping part abuts against the top inner wall of the mounting base, and the lower surface of the ultrasonic probe is on the same plane as the top inner wall of the mounting base.

[0011] The above solution uses a scraping part that abuts against the inner wall of the mounting base. The surface of the ultrasonic probe is flush with the inner wall of the mounting base, and the scraping part slides within the mounting base. Therefore, the scraping part abuts against the lower surface of the ultrasonic probe. When the scraping part slides, it scrapes and pushes the water mist on the ultrasonic probe into a water stream, which then flows down, thereby removing the water mist from the ultrasonic probe.

[0012] The scraping section can be straight or concave arc-shaped. When the scraping section is arc-shaped, the water flows inside the scraping section, preventing it from flowing from both sides into the mounting base and back onto the ultrasonic probe.

[0013] Furthermore, a water storage tank is provided on the top inner wall of the mounting base, and a guide groove communicating with the water storage tank is provided on the scraper, and the scraper moves along the width direction of the scraping part.

[0014] Furthermore, the distance between the scraping part and both ends of the guide channel is greater than the diameter of the lower surface of the ultrasonic probe, and the distance between the two ends of the guide channel is greater than the width of the water storage tank.

[0015] The above solution, through the setting of water storage tank and guide channel, uses the electromagnetic push rod at a very high speed to drive the scraper to complete the reciprocating motion at an extremely fast speed in the mounting base. Therefore, some water mist is pushed by the scraping part to form a water flow from the end of the scraping part, while some water mist does not have time to flow down the scraping part before it returns to its original position. During the process of the scraping part returning to its original position, the water mist is thrown into the water storage tank, and the water mist flows down through the guide channel in the water storage tank.

[0016] When the scraping part is straight or arc-shaped, both ends of the scraping part extend to the outer side of the ultrasonic probe surface, so that the scraping part can completely scrape off the water mist on the surface of the ultrasonic probe; both ends of the guide groove extend to both ends of the water storage tank to avoid the water in the water storage tank flowing on the scraper due to the guide groove being too short, causing it to return to the surface of the ultrasonic probe during the next movement.

[0017] Furthermore, the outer wall of the electromagnetic push rod is connected to the side wall of the housing, the output shaft of the electromagnetic push rod passes through the side wall of the housing, and a clamping plate is connected to the output shaft of the electromagnetic push rod.

[0018] Furthermore, a slot matching the card plate is provided on the side wall of the scraper, and the card plate is engaged in the slot to connect the electromagnetic push rod with the scraper.

[0019] The above solution uses a card plate and a slot to allow the output shaft of the electromagnetic push rod to move back and forth inside the housing. The output shaft of the electromagnetic push rod locks the card plate in the slot, thereby connecting it with the scraper and driving the scraper to move back and forth to remove water mist from the ultrasonic probe.

[0020] Furthermore, a pressure plate is bolted to the bottom of the mounting base, the upper surface of the pressure plate has a gap with the lower surface of the mounting base, and the upper surface of the pressure plate abuts against the lower surface of the scraper; a spring is sleeved on the bolt, and the spring abuts against the lower surface of the pressure plate.

[0021] The above solution uses a pressure plate, which, via a spring, presses a scraper against the inner wall of the mounting base, causing the scraper to move and remove water mist from the ultrasonic probe. After the scraper repeatedly removes water mist from the ultrasonic probe, the upper surface of the scraping part will be worn, creating a gap between it and the ultrasonic probe, causing the scraper to be unable to remove water mist or reducing its scraping efficiency. As the spring is compressed, it pushes the pressure plate, causing the scraper to move upward, reducing the gap between the mounting base and the pressure plate, allowing the scraper to continue to be in close contact with the surface of the ultrasonic probe, thereby removing the water mist.

[0022] Furthermore, a circuit board is provided inside the housing, and the circuit board is located above the mounting base. The circuit board is electrically connected to the ultrasonic probe and the electromagnetic push rod, respectively.

[0023] The above solution uses a circuit board to drive an electromagnetic push rod, which in turn drives a scraper to remove water mist from the ultrasonic probe. The signal detected by the ultrasonic probe is then sent to the circuit board, which calculates the measurement results.

[0024] Furthermore, the bottom of the housing is an open structure, and the bottom of the housing is used to install pipes.

[0025] Compared with the prior art, the beneficial technical effects of the present invention are as follows: (I) This invention, by setting up a scraping component, activates an electromagnetic pusher to push a scraper to slide within the mounting base. As the scraping part slides, it scrapes and pushes the water mist on the ultrasonic probe into a water flow, which then flows down. The electromagnetic pusher drives the scraper to reciprocate, returning to its original position after scraping off the water mist. The electromagnetic pusher is activated once every certain period of time, thereby achieving periodic scraping of water mist from the probe surface. This avoids the problem of water mist easily condensing on the surface of the ultrasonic probe, which can lead to ultrasonic signal attenuation or distortion, ensuring a clean detection surface and improving the reliability of signal transmission.

[0026] (ii) By setting up a water storage tank, the electromagnetic push rod drives the scraper to complete the reciprocating motion at an extremely fast speed in the mounting base. Some water mist does not have time to flow down on the scraping part before it returns to its original position. During the process of the scraping part returning to its original position, the water mist is thrown into the water storage tank. The water mist then flows down through the guide channel in the water storage tank, thereby removing the water mist.

[0027] (III) By setting up a pressure plate, after the scraper repeatedly scrapes away the water mist on the ultrasonic probe, the upper surface of the scraping part will be worn, thereby creating a gap between it and the ultrasonic probe, causing the scraper to be unable to scrape away the water mist or reducing the scraping efficiency; as the spring is compressed, the spring pushes the pressure plate to move the scraper upward, the gap between the mounting base and the pressure plate decreases, and the scraper continues to be in close contact with the surface of the ultrasonic probe, thereby scraping away the water mist. Attached Figure Description

[0028] Figure 1A schematic diagram of the structure of the self-cleaning ultrasonic sensing device of the present invention is shown; Figure 2 for Figure 1 A bottom view; Figure 3 for Figure 2 Internal structure diagram; Figure 4 This is a structural diagram of the scraping component; Figure 5 for Figure 1 Internal structure diagram; Figure 6 This is a schematic diagram of the shell structure.

[0029] The following are labels in the attached diagram: 1. Housing; 2. Mounting base; 21. Mounting hole; 22. Water storage tank; 3. Ultrasonic probe; 4. Scraping assembly; 41. Electromagnetic push rod; 411. Clamping plate; 42. Scraper; 421. Scraping section; 422. Guide channel; 423. Slot; 5. Pressure plate; 51. Bolt; 52. Spring; 6. Circuit board. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the device proposed by this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, only for the purpose of conveniently and clearly illustrating the embodiments of this invention. Please refer to the accompanying drawings to make the objectives, features, and advantages of this invention more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives achieved by this invention, should still fall within the scope of the technical content disclosed in this invention.

[0031] Accordingly, in specific embodiment 1, such as Figure 1 As shown, the present invention also provides a self-cleaning ultrasonic sensing device, comprising: a housing 1, an ultrasonic probe 3, and a scraping assembly 4, wherein the ultrasonic probe 3 is configured to detect liquid flow rate, and the scraping assembly 4 is configured to contact the ultrasonic probe 3 and remove liquid adhering to the surface of the ultrasonic probe 3 when moving relative to the ultrasonic probe 3.

[0032] The ultrasonic probe 3 is installed in a heating device such as a coffee machine or boiler. Since the ultrasonic probe 3 is in a high-temperature and high-humidity enclosed space, water mist will adhere to the surface of the ultrasonic probe 3. When the scraping component 4 is activated, it will come into contact with the surface of the ultrasonic probe 3 during its movement, thereby scraping away the water mist on its surface, so that the ultrasonic probe 3 is not contaminated and the detection results are highly accurate.

[0033] The bottom of the housing 1 is an open structure, and the bottom of the housing 1 is used to install pipes; a mounting base 2 is provided inside the housing 1, and a mounting hole 21 is opened on the mounting base 2. The ultrasonic probe 3 is connected in the mounting hole 21, and the scraping component 4 scrapes off the water mist on the ultrasonic probe 3.

[0034] like Figure 3 As shown, the scraping assembly 4 includes an electromagnetic push rod 41 connected to the housing 1 and a scraper 42 connected to the output shaft of the electromagnetic push rod 41. The upper surface of the scraper 42 abuts against the lower surface of the ultrasonic probe 3. The electromagnetic push rod 41 is used to drive the scraper 42 to slide within the mounting base 2. The electromagnetic push rod 41 drives the scraper 42 to move on the surface of the ultrasonic probe 3, thereby scraping away the water mist on the ultrasonic probe 3.

[0035] like Figure 4 As shown, a scraping part 421 is provided on the top of the scraper 42, and the scraping part 421 is located at one end of the scraper 42 near the ultrasonic probe 3; the upper surface of the scraping part 421 abuts against the inner wall surface of the top of the mounting base 2, and the lower surface of the ultrasonic probe 3 is on the same plane as the inner wall surface of the top of the mounting base 2. The scraping part 421 is used to scrape off the water mist on the ultrasonic probe 3.

[0036] The scraping part 421 abuts against the inner wall of the mounting base 2, the surface of the ultrasonic probe 3 is flush with the inner wall of the mounting base 2, and the scraping part 421 slides inside the mounting base 2. Therefore, the scraping part 421 abuts against the lower surface of the ultrasonic probe 3. When the scraping part 421 slides, it scrapes and pushes the water mist on the ultrasonic probe 3 into a water stream and then flows down, thereby removing the water mist on the ultrasonic probe 3.

[0037] It should be noted that the scraping part 421 abuts against the inner wall of the mounting base 2, and the surface of the ultrasonic probe 3 is flush with the inner wall of the mounting base 2. The scraping part 421 slides within the mounting base 2, thus abutting against the lower surface of the ultrasonic probe 3. As the scraping part 421 slides, it scrapes and pushes the water mist on the ultrasonic probe 3 into a stream, which then flows down, thereby removing the water mist from the ultrasonic probe 3. The scraping part 421 can be straight or concave. When the scraping part 421 is concave, the water flow is inside the scraping part 421, preventing it from flowing from both sides into the mounting base 2 and back onto the ultrasonic probe 3. When the scraping part 421 is straight, its length can be set to be relatively long to prevent water from flowing backward from both ends of the scraping part 421 onto the ultrasonic probe 3.

[0038] likeFigure 6 As shown, a water storage tank 22 is provided on the top inner wall of the mounting base 2, and a guide channel 422 communicating with the water storage tank 22 is provided on the scraper 42. The scraper 42 moves along the width direction of the scraping part 421, and when the scraper 42 moves, the scraping part 421 passes through the surface of the ultrasonic probe 3. The distance between the scraping part 421 and both ends of the guide channel 422 is greater than the diameter of the lower surface of the ultrasonic probe 3, and the distance between the two ends of the guide channel 422 is greater than the width of the water storage tank 22.

[0039] Because the electromagnetic push rod 41 moves very fast, it drives the scraper 42 to reciprocate at an extremely high speed within the mounting base 2. As a result, some water mist is pushed by the scraping part 421 to form a water flow that flows down from the end of the scraping part 421. Some water mist does not have time to flow down the scraping part 421 before it returns to its original position. During the process of returning to its original position, the scraping part 421 throws the water mist into the water storage tank 22, where it flows down through the guide channel 422.

[0040] It should be noted that if the water storage tank 22 and the guide channel 422 are not provided, the water flow will remain between the scraping part 421 and the mounting base 2, so that when the water mist is scraped off again, the water flow will return to the ultrasonic probe 3. If the scraping part 421 is not provided, the entire upper surface of the scraper 42 is in contact with the mounting base 2. After the scraper 42 returns to its original position, some water flow will remain on the scraper 42. When the water mist is scraped off again, the water flow on the scraper 42 will contact the surface of the ultrasonic probe 3 and return to the ultrasonic probe 3. After the scraping part 421 is provided, the scraping part 421 and the scraper 42 form a step shape. Water mist remains on the scraper 42. When the water mist is scraped off again, due to the height difference, the water mist will not contact the ultrasonic probe 3. When a certain amount of water mist accumulates on the scraper 42, it will flow down from the guide channel 422.

[0041] like Figure 4 As shown, a slot 423 matching the clamping plate 411 is provided on the side wall of the scraper 42. The clamping plate 411 is engaged in the slot 423 to connect the electromagnetic push rod 41 to the scraper 42. The outer wall of the electromagnetic push rod 41 is connected to the side wall of the housing 1, and the output shaft of the electromagnetic push rod 41 passes through the side wall of the housing 1. The clamping plate 411 is connected to the output shaft of the electromagnetic push rod 41. The output shaft of the electromagnetic push rod 41 moves back and forth through the housing 1, clamping the clamping plate 411 in the slot 423, thereby connecting it to the scraper 42 and driving the scraper 42 to move back and forth to scrape away the water mist on the ultrasonic probe 3.

[0042] like Figure 5As shown, a circuit board 6 is disposed inside the housing 1, above the mounting base 2. The circuit board 6 is electrically connected to the ultrasonic probe 3 and the electromagnetic push rod 41. The circuit board 6 drives the electromagnetic push rod 41 to start, and the electromagnetic push rod 41 drives the scraper 42 to scrape away the water mist on the ultrasonic probe 3. The signal detected by the ultrasonic probe 3 is sent to the circuit board 6, and the circuit board 6 calculates the measurement result. The circuit board 6's driving of the electromagnetic push rod 41, receiving and processing the signal from the ultrasonic probe 3 are common knowledge to those skilled in the art, and therefore will not be described in detail.

[0043] In specific embodiment 2, this embodiment is based on embodiment 1, such as... Figure 2 As shown, the bottom of the mounting base 2 is connected to a pressure plate 5 by bolts 51. The pressure plate 5 has through holes so that the ultrasonic probe 3 can detect hot water when the housing 1 is installed. There is a gap between the upper surface of the pressure plate 5 and the lower surface of the mounting base 2. A spring 52 is sleeved on the bolt 51 and abuts against the lower surface of the pressure plate 5.

[0044] The pressure plate 5, via the spring 52, presses the scraper 42 against the inner wall of the mounting base 2, causing the scraper 42 to move and scrape away the water mist on the ultrasonic probe 3. After the scraper 42 scrapes away the water mist on the ultrasonic probe 3 multiple times, the upper surface of the scraping part 421 will be worn, resulting in a gap between it and the ultrasonic probe 3, causing the scraper 42 to be unable to scrape away the water mist or reducing the scraping efficiency. Since the spring 52 is initially compressed, and there is a gap above the scraper 42, the spring 52 pushes the pressure plate 5 to move the scraper 42 upward, reducing the gap between the pressure plate 5 and the mounting base 2, and eliminating the gap between the scraping part 421 and the surface of the ultrasonic probe 3, so that the scraping part 421 continues to abut against the surface of the ultrasonic probe 3. The spring 52 stops pushing, so the scraper 42 continues to scrape away the water mist.

[0045] The water mist removal process of the self-cleaning ultrasonic sensing device of the present invention is as follows: First, the housing 1 is installed at the hot water pipe. After the ultrasonic probe 3 has been used for a period of time, the electromagnetic push rod 41 is activated. The output shaft of the electromagnetic push rod 41 pushes the scraper 42 to slide within the mounting base 2. When the scraper 42 moves to the edge of the ultrasonic probe 3, the scraping part 421 begins to push the water mist on the ultrasonic probe 3, pushing all the water mist on the ultrasonic probe 3 to gather into a water flow. When the scraper 42 moves to its farthest distance, the water flow flows down from the end of the scraper 42. The electromagnetic push rod 41 drives the scraper 42 back to its original position. Some of the water mist does not have time to flow down on the scraping part 421 before it returns to its original position. During the return process, the scraping part 421 throws the water mist into the water storage tank 22, where the water mist flows down through the guide channel 422. By repeating the above steps, water mist on the surface of the ultrasonic probe 3 can be scraped off at regular intervals, thereby achieving periodic removal of water mist from the probe surface. This avoids the problem of water mist easily condensing on the probe surface, which can lead to ultrasonic signal attenuation or distortion, ensuring a clean detection surface and improving signal transmission reliability.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A self-cleaning ultrasonic sensing device, characterized in that, include: An ultrasonic probe configured to detect liquid flow rate; A scraping assembly configured to contact the ultrasonic probe and remove liquid adhering to the surface of the ultrasonic probe during movement relative to the ultrasonic probe.

2. The self-cleaning ultrasonic sensing device as described in claim 1, characterized in that, It also includes a housing, in which a mounting base is provided, and a mounting hole is provided on the mounting base, and the ultrasonic probe is connected to the mounting hole; The scraping assembly includes an electromagnetic push rod connected to the housing and a scraper connected to the output shaft of the electromagnetic push rod. The upper surface of the scraper abuts against the lower surface of the ultrasonic probe, and the electromagnetic push rod is used to drive the scraper to slide within the mounting base.

3. The self-cleaning ultrasonic sensing device as described in claim 2, characterized in that, The top of the scraper is provided with a scraping part, which is located at one end of the scraper near the ultrasonic probe. The upper surface of the scraping part abuts against the top inner wall of the mounting base, and the lower surface of the ultrasonic probe is on the same plane as the top inner wall of the mounting base.

4. The self-cleaning ultrasonic sensing device as described in claim 3, characterized in that, The mounting base has a water storage tank on its top inner wall, and the scraper has a guide groove that communicates with the water storage tank. The scraper moves along the width direction of the scraping part.

5. The self-cleaning ultrasonic sensing device as described in claim 4, characterized in that, The distance between the scraping part and both ends of the guide channel is greater than the diameter of the lower surface of the ultrasonic probe, and the distance between the two ends of the guide channel is greater than the width of the water storage tank.

6. The self-cleaning ultrasonic sensing device as described in claim 2, characterized in that, The outer wall of the electromagnetic push rod is connected to the side wall of the housing, the output shaft of the electromagnetic push rod passes through the side wall of the housing, and a clamping plate is connected to the output shaft of the electromagnetic push rod.

7. The self-cleaning ultrasonic sensing device as described in claim 6, characterized in that, The scraper has a slot on its side wall that matches the card plate. The card plate is engaged in the slot so that the electromagnetic push rod is connected to the scraper.

8. The self-cleaning ultrasonic sensing device as described in claim 2, characterized in that, The bottom of the mounting base is connected to a pressure plate by bolts. The upper surface of the pressure plate has a gap with the lower surface of the mounting base, and the upper surface of the pressure plate abuts against the lower surface of the scraper. A spring is sleeved on the bolt, and the spring abuts against the lower surface of the pressure plate.

9. The self-cleaning ultrasonic sensing device as described in claim 2, characterized in that, A circuit board is provided inside the housing and is located above the mounting base. The circuit board is electrically connected to the ultrasonic probe and the electromagnetic push rod, respectively.

10. The self-cleaning ultrasonic sensing device as described in claim 2, characterized in that, The bottom of the housing is an open structure, and the bottom of the housing is used to install pipes.

Images