A sensor for measuring density and liquid level with single ultrasonic head and anti-bubble interference

Abstract

This invention relates to the field of solution density and level detection technology, and discloses a single ultrasonic sensor for measuring density and level with anti-bubble interference. The sensor includes: a conduit assembly comprising a guide tube, a bubble filter structure disposed on the bottom side of the guide tube, and a first reflector plate disposed inside the guide tube, the first reflector plate also having a through hole; a float assembly disposed inside the guide tube, comprising a float body and a second reflector plate disposed at the bottom of the float body; and an ultrasonic sensor assembly, one end of which is connected to the conduit assembly for emitting ultrasonic waves into the solution within the conduit assembly and receiving ultrasonic waves reflected by the first and second reflector plates. The bubble filter structure effectively blocks bubbles outside the guide tube, reducing their accumulation in the measurement area, providing a high-purity liquid sample for the ultrasonic probe, improving the accuracy of density and level measurements, and ensuring measurement stability. This invention reduces the number of independent sensors, lowering installation complexity and maintenance costs.

Description

Technical Field

[0001] This invention relates to the technical field of solution density and level detection, and more specifically, to a single ultrasonic head sensor for measuring density and level that is resistant to bubble interference. Background Technology

[0002] To meet the China VI emission standards, diesel engines commonly employ SCR (Selective Catalytic Reduction) technology to treat exhaust gases. In this system, urea solution acts as a reducing agent, reacting chemically with nitrogen oxides (including nitric oxide and nitrogen dioxide) in the exhaust gas to ultimately produce harmless nitrogen and water, effectively reducing pollutant emissions. To ensure the purification effect of the SCR system, the mass concentration of the urea solution must be strictly controlled near the standard value of 32.5%. When the concentration deviates from the allowable range, the system must promptly issue a warning signal. Furthermore, the solution level in the urea storage tank must be monitored in real time. When the level drops below a preset warning line, the system should trigger an alarm function to remind operators to replenish the urea solution promptly.

[0003] Existing solutions to prevent bubble interference typically employ methods such as filters, vibration, or rinsing. Methods for detecting the density and level of urea solutions usually involve using two ultrasonic sensors to measure the density and level separately, or using an infrared sensor to measure the density and an ultrasonic sensor to measure the level. The drawbacks of this approach are that using a dual-probe measurement scheme (such as an ultrasonic + ultrasonic combination or an infrared + ultrasonic combination) requires two independent mounting holes in the urea tank, increasing the risk of seal failure and media leakage. The density probe needs to be immersed in the solution for measurement (infrared methods require a clean, crystal-free light window, and ultrasonic immersion methods require protection against bubble interference), while the level probe is sensitive to its installation location and liquid level condition. Independent calibration of the two systems leads to asynchronous temperature compensation (resulting in higher superposition errors in density and level measurements under urea solution temperature gradients). More seriously, both probes require frequent maintenance in crystallization environments, leading to higher maintenance costs and a greater risk of downtime.

[0004] Therefore, it is necessary to propose a single ultrasonic head sensor for measuring density and liquid level that is resistant to bubble interference, in order to at least partially solve the problems existing in the prior art. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides a single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference, comprising:

[0007] The conduit assembly includes a guide tube, a bubble filter structure disposed on the bottom side of the guide tube, and a first reflective sheet disposed inside the guide tube, the first reflective sheet also having a through hole;

[0008] A float assembly disposed within a guide tube includes a float body and a second reflector disposed at the bottom of the float body;

[0009] An ultrasonic sensor assembly, one end of which is connected to a conduit assembly, is used to emit ultrasonic waves into the solution within the conduit assembly and to receive ultrasonic waves reflected by a first reflector and a second reflector.

[0010] Preferably, the surfaces of the first and second reflective sheets are provided with a hydrophilic coating.

[0011] Preferably, the bubble filter structure includes:

[0012] A bushing, having at least one first liquid inlet hole on its side wall, with the first reflective sheet positioned above the bushing;

[0013] A filter screen, located on the outside of the bushing, is used to filter air bubbles.

[0014] Preferably, the filter screen has at least two layers, and the pore size of the outer layer filter screen is larger than that of the inner layer filter screen.

[0015] Preferably, the density of the float is less than the density of the solution in the guide tube.

[0016] Preferably, the ultrasonic sensor assembly includes:

[0017] The sensor body is used to transmit and receive ultrasonic waves;

[0018] The sensor housing is connected to the bottom of the conduit assembly, and the sensor body is located inside the sensor housing;

[0019] The protective tube has one end sealed to the sensor housing, and the main body of the sensor is located inside the protective tube.

[0020] The pagoda head is fitted onto the outside of the cable and located at the connection between the cable sheath and the sensor housing.

[0021] Preferably, the bubble filter structure includes:

[0022] The inlet pipe connected to the guide pipe has at least one filter channel in its side wall, an inlet port communicating with the filter channel is provided on the outside of the inlet pipe, and an outlet port communicating with the filter channel is provided on the inside of the inlet pipe. The first reflective sheet is located above the inlet pipe.

[0023] The filter body, located inside the filter channel, is used to filter air bubbles.

[0024] Preferably, the side wall of the liquid inlet pipe is provided with multiple baffles, and a channel unit is formed between two adjacent baffles. The upper or lower parts of two adjacent channel units are connected to form a filtration channel so that the solution flows in an S-shape within the filtration channel.

[0025] The inlet is located on the upper part of the corresponding channel unit, and the outlet is located on the inner wall of the corresponding channel unit. The channel unit where the outlet is located is connected to the lower part of the adjacent channel unit.

[0026] Preferably, the filter body includes: filter units corresponding to multiple channel units respectively, and the filter units are provided with multiple filter holes arranged parallel to the axis of the liquid inlet pipe;

[0027] The pore size of the filter holes in the multiple filter units arranged from the inlet to the outlet decreases sequentially.

[0028] Preferably, the top of the channel unit is provided with a spike.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] The bubble-filtering single-ultrasonic head sensor for measuring density and liquid level described in this invention uses a bubble filter structure to block bubbles on the outside of the guide tube, reducing their accumulation in the measurement area and creating a stable low-bubble environment within the guide tube. This provides the ultrasonic probe with a high-purity liquid sample, significantly improving the measurement accuracy of density and liquid level and ensuring measurement stability. This invention uses a single ultrasonic head to measure the density and liquid level of urea solution, achieving dual-parameter collaborative detection. By accurately calculating the sound wave echo time difference, the liquid level height is analyzed. Simultaneously, based on the strong physical correlation between sound velocity and density in urea solution, the liquid density can be measured. Furthermore, to improve accuracy, a real-time temperature compensation algorithm can be combined to invert the medium density value. This design not only significantly reduces the number of independent sensors but also simultaneously reduces installation complexity and maintenance costs, further reduces potential leakage points, and improves the reliability and real-time performance of data detection.

[0031] The single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference described in this invention, other advantages, objectives and features of the invention will be apparent in part from the following description, and in part will be understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of the structure of the single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference as described in this invention.

[0034] Figure 2 This is an exploded structural diagram of the conduit assembly, ultrasonic sensor assembly, and float assembly in the single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference as described in this invention.

[0035] Figure 3 This is an exploded structural diagram of the single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference as described in this invention.

[0036] Figure 4 This is a schematic cross-sectional view of the single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference as described in this invention.

[0037] Figure 5 This is a schematic diagram of the internal structure of the single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference as described in this invention.

[0038] Figure 6 This is an exploded structural diagram of the second embodiment of the bubble filtering structure in the single ultrasonic head sensor for measuring density and liquid level to prevent bubble interference, as described in this invention.

[0039] Figure 7 This is a schematic diagram of the second embodiment of the bubble filtering structure in the single ultrasonic head sensor for measuring density and liquid level to prevent bubble interference, as described in this invention.

[0040] Figure 8 This is a schematic diagram of the filter channel in the single ultrasonic head sensor for measuring density and liquid level to prevent bubble interference, as described in this invention.

[0041] Figure 9 This is a schematic diagram of the internal structure of the side wall of the liquid inlet pipe in the single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference as described in this invention.

[0042] In the attached drawings, 1 is the conduit assembly, 11 is the guide tube, 12 is the first reflector, 121 is the through hole, 13 is the bushing, 131 is the first liquid inlet, 14 is the filter screen, 15 is the liquid inlet pipe, 151 is the liquid inlet, 152 is the liquid outlet, 16 is the filter channel, 161 is the channel unit, 17 is the filter body, 171 is the filter unit, 18 is the baffle, 2 is the ultrasonic sensor assembly, 21 is the sensor body, 22 is the sensor housing, 23 is the cable protection tube, 24 is the pagoda head, 3 is the float assembly, 31 is the float body, and 32 is the second reflector. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0044] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0045] like Figures 1-5 As shown, this invention provides a single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference, comprising:

[0046] The conduit assembly 1 includes a guide tube 11, a bubble filter structure disposed on the bottom side of the guide tube 11, and a first reflective sheet 12 disposed inside the guide tube 11. The first reflective sheet 12 is also provided with a through hole 121.

[0047] The float assembly 3, which is disposed in the guide tube 11, includes a float 31 and a second reflective sheet 32 ​​disposed at the bottom of the float 31.

[0048] The ultrasonic sensor assembly 2, one end of which is connected to the conduit assembly 1, is used to emit ultrasonic waves into the solution in the conduit assembly 1 and to receive ultrasonic waves reflected by the first reflector 12 and the second reflector 32.

[0049] When measuring the density and level of urea solution, the urea solution enters the guide tube 11 through the bubble filter structure. The bubbles are blocked by the bubble filter structure, forming a stable low-foam environment in the guide tube 11.

[0050] When measuring the density of urea solution using a single ultrasonic head, high-frequency sound waves are emitted into the solution in the guide tube 11 through the ultrasonic sensor assembly 2. The sound waves are reflected back to the ultrasonic sensor assembly 2 by the first reflector 12 in the guide tube 11. After receiving the reflected sound waves, the ultrasonic sensor assembly 2 can calculate the real-time density value by accurately measuring the time difference between ultrasonic emission and reception. When calculating the density value, any temperature compensation algorithm in the existing technology can be combined to ensure the accuracy of the density value calculation.

[0051] When measuring the liquid level of urea solution using a single ultrasonic head, high-frequency sound waves are emitted into the solution in the guide tube 11 through the ultrasonic sensor assembly 2. The sound waves pass through the through hole 121 on the first reflector 12, reach the float assembly 3 along the guide tube 11, and are then reflected by the second reflector 32 on the float assembly 3. The sound waves then return along the guide tube 11, pass through the first reflector 12, and finally return to the ultrasonic sensor assembly 2. After receiving the reflected sound waves, the ultrasonic sensor assembly 2 calculates the liquid level height in real time by accurately measuring the time difference between ultrasonic emission and reception, combined with the propagation speed of the sound waves in the urea medium.

[0052] When measuring density and liquid level, ultrasonic waves of different frequencies can be used for separate measurements, or ultrasonic waves of the same frequency can be used for simultaneous measurements.

[0053] Through the above design, the bubble filter structure can block bubbles on the outside of the guide tube 11, reducing their accumulation in the measurement area and creating a stable low-bubble environment inside the guide tube 11. This provides a high-purity liquid sample for the ultrasonic probe, significantly improving the measurement accuracy of density and liquid level, and ensuring measurement stability. This invention uses a single ultrasonic head to measure the density and liquid level of urea solution, achieving dual-parameter collaborative detection. By accurately calculating the sound wave echo time difference, the liquid level height is analyzed. At the same time, based on the strong physical correlation between sound velocity and density in urea solution (density changes can significantly change the sound wave propagation speed), the liquid density can be measured. In addition, to improve accuracy, a real-time temperature compensation algorithm can be combined to invert the medium density value. This design not only significantly reduces the number of independent sensors, but also simultaneously reduces installation complexity and maintenance costs, reduces potential leakage points, and improves the reliability and real-time performance of data detection.

[0054] In addition, the present invention integrates density and liquid level dual parameter measurement with active anti-bubble interference capability, making it particularly suitable for scenarios with limited space and requiring cost-effectiveness, such as vehicle urea tanks and industrial storage tanks, providing a low-maintenance and accurate monitoring solution.

[0055] In one embodiment, the surfaces of the first reflective sheet 12 and the second reflective sheet 32 ​​are provided with a hydrophilic coating.

[0056] The first reflector 12 and the second reflector 32 have the function of reflecting ultrasonic waves. The hydrophilic coating enables the first reflector 12 and the second reflector 32 to preferentially combine with water and prevents bubble adsorption, avoiding bubble interference with sound wave reflection and effectively suppressing interference such as sound wave scattering and attenuation caused by bubbles.

[0057] like Figure 5 The first embodiment of the bubble filtration structure is shown, which includes:

[0058] The bushing 13 has at least one first liquid inlet hole 131 on its side wall, and the first reflective sheet 12 is disposed above the bushing 13.

[0059] The filter screen 14 is located on the outside of the bushing 13 and is used to filter air bubbles.

[0060] The bottom of the guide tube 11 is provided with a stepped surface. The first reflective sheet 12 is pressed between the top of the bushing 13 and the stepped surface to fix the first reflective sheet 12. The bottom of the bushing 13 is connected to the ultrasonic sensor assembly 2. The filter screen 14 is fixed to the outside of the bushing 13 by means of adhesive bonding, etc.

[0061] The bushing 13 is used to support the filter screen 14, which can prevent the filter screen 14 from sinking inward significantly when the solution is injected. After the solution passes through the filter screen 14, the air bubbles are blocked on the outside of the filter screen 14, which can efficiently intercept and guide the tiny air bubbles. Then, the solution enters the guide tube 11 through the first liquid inlet hole 131 on the bushing 13, which reduces the accumulation of air bubbles in the measurement area (i.e., inside the guide tube 11), suppresses interference such as sound wave scattering and attenuation caused by air bubbles, and improves the density inversion accuracy as well as the stability and reliability of liquid level detection.

[0062] like Figure 3 and Figure 5 As shown, the filter 14 has at least two layers, and the pore size of the outer filter 14 is larger than that of the inner filter 14.

[0063] The filter 14 adopts a multi-layer mesh design, with at least two layers. The pore size of the multi-layer mesh decreases from the outside to the inside. The filter 14 can reduce the interference of air bubbles on the measurement results.

[0064] In one embodiment, the density of the float 31 is less than the density of the solution inside the guide tube 11.

[0065] When the liquid level of the solution changes, the position of the float 31 can change along the guide tube 11 with the change of liquid level, and the second reflector 32 on the float 31 moves accordingly.

[0066] In one embodiment, the ultrasonic sensor assembly 2 includes:

[0067] Sensor body 21 is used to transmit and receive ultrasonic waves;

[0068] The sensor housing 22 is connected to the bottom of the conduit assembly 1, and the sensor body 21 is disposed inside the sensor housing 22;

[0069] The protective tube 23 has one end sealed to the sensor housing 22, and the wire of the sensor body 21 is located inside the protective tube 23.

[0070] The pagoda head 24 is fitted onto the outside of the cable body and is located at the connection between the cable protection tube 23 and the sensor housing 22.

[0071] The sensor body 21 can transmit and receive high-frequency sound waves at a single point, analyze the sound velocity and echo time difference, and obtain the density and liquid level of the solution. The sensor housing 22 is connected to the bottom of the conduit assembly 1, and the protective tube 23 is sealed to one side of the sensor housing 22, so that the upper surface of the sensor body 21 is in contact with the solution, while the wire (i.e. the signal wire) and the rest of the wire are not in contact with the solution, thus preventing the urea solution from corroding the wire. The pagoda head 24 is pressed between the protective tube 23 and the wire, forming a protection for the bend of the wire. The pagoda head is provided with multiple cones along the axial direction on the outer side of the protective tube 23, which protects the wire while allowing the wire to bend with the protective tube 23.

[0072] like Figures 6-9 As shown, the present invention also provides a second embodiment of the bubble filtration structure, the bubble filtration structure comprising:

[0073] The liquid inlet pipe 15, which is connected to the guide pipe 11, has at least one filter channel 16 in its side wall. The outer side of the liquid inlet pipe 15 is provided with an inlet port 151 communicating with the filter channel 16, and the inner side of the liquid inlet pipe 15 is provided with an outlet port 152 communicating with the filter channel 16. The first reflective sheet 12 is located above the liquid inlet pipe 15.

[0074] The filter body 17 is disposed within the filter channel 16 and is used to filter air bubbles.

[0075] The filter channel 16 is located inside the side wall of the inlet pipe 15. The inlet port 151 and the outlet port 152 are located on the outside and inside of the inlet pipe 15, respectively. After the solution enters from the inlet port 151, it is filtered by the filter body 17 in the filter channel 16, and then enters the guide pipe 11 from the outlet port 152. This can extend the filtration path and thus enhance the filtering and blocking effect of bubbles.

[0076] like Figures 7-9 As shown, in one embodiment, the inlet pipe 15 is provided with a plurality of baffles 18 in the side wall, and a channel unit 161 is formed between two adjacent baffles 18. The upper or lower part of two adjacent channel units 161 are connected to form a filter channel 16 so that the solution flows in an S-shape in the filter channel 16.

[0077] The inlet 151 is located on the upper part of the corresponding channel unit 161, and the outlet 152 is located on the inner wall of the corresponding channel unit 161. The channel unit 161 where the outlet 152 is located is connected to the lower part of the adjacent channel unit 161.

[0078] like Figure 9As shown, in one embodiment, the filter body 17 includes: a filter unit 171 corresponding to a plurality of channel units 161 respectively, and the filter unit 171 is provided with a plurality of filter holes arranged parallel to the axis of the liquid inlet pipe 15.

[0079] The pore size of the filter holes of the multiple filter units 171 arranged from the liquid inlet 151 to the liquid outlet 152 decreases sequentially.

[0080] The filter unit 171 consists of multiple filter layers stacked together, or it can be a single filter body.

[0081] After the solution enters through inlet 151, it first flows into the corresponding channel unit 161. From there, it flows downwards above the filter unit 171, thus some air bubbles are blocked above the filter unit 171. Figure 9 As shown, the solution then flows from the lower part of the right channel unit 161 to the left channel unit 161. In the left channel unit 161, it flows upward from the bottom of the filter unit 171 to further filter the air bubbles. This cycle continues until the solution flows from the lower part of a baffle 18 to the leftmost channel unit 161. This channel unit 161 does not need to be equipped with a separate filter unit 171, but only has an outlet 152. The solution after multi-stage filtration then enters the guide tube 11 from the outlet 152.

[0082] The pore size of the filter holes in the multiple filter units 171 decreases sequentially, which can filter bubbles of different sizes in stages, further improving the blocking effect on bubbles.

[0083] In one embodiment, the channel unit 161 is provided with spikes.

[0084] The upper and lower parts of the filter unit 171 and the channel unit 161 both form a spatial region. The spikes are provided on the side wall of the spatial region, at least at the top or bottom of the spatial region, so that the filtered bubbles can move within the spatial region. The pore size of the filter unit 171 decreases sequentially. During the flow of the solution, the pressure in the spatial region will increase, thereby squeezing and pushing the bubbles. After the bubbles are punctured by the spikes, the defoaming effect can be achieved.

[0085] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0086] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the present invention, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference, characterized in that, include: The conduit assembly (1) includes a guide tube (11), a bubble filter structure disposed on the bottom side of the guide tube (11), and a first reflective sheet (12) disposed inside the guide tube (11). The first reflective sheet (12) is also provided with a through hole (121). The float assembly (3) is disposed in the guide tube (11), which includes a float (31) and a second reflector (32) disposed at the bottom of the float (31). An ultrasonic sensor assembly (2) is connected at one end to a conduit assembly (1) for transmitting ultrasonic waves into the solution within the conduit assembly (1) and receiving ultrasonic waves reflected by a first reflector (12) and a second reflector (32). When measuring density, ultrasonic waves are emitted into the solution in the guide tube (11) through the ultrasonic sensor assembly (2), and the ultrasonic waves are reflected back to the ultrasonic sensor assembly (2) by the first reflector (12) in the guide tube (11). When measuring the liquid level, ultrasonic waves are emitted into the solution in the guide tube (11) through the ultrasonic sensor assembly (2). The ultrasonic waves pass through the through hole (121) on the first reflector (12), reach the float assembly (3) along the guide tube (11), and then are reflected by the second reflector (32) on the float assembly (3). The ultrasonic waves then return along the guide tube (11) and pass through the first reflector (12) back to the ultrasonic sensor assembly (2). The bubble filtration structure includes: The liquid inlet pipe (15) connected to the guide pipe (11) has at least one filter channel (16) in its side wall. The outside of the liquid inlet pipe (15) is provided with an inlet (151) communicating with the filter channel (16), and the inside of the liquid inlet pipe (15) is provided with an outlet (152) communicating with the filter channel (16). The first reflective sheet (12) is located above the liquid inlet pipe (15). The filter body (17) is set inside the filter channel (16) and is used to filter air bubbles; The inlet pipe (15) has multiple baffles (18) inside its side wall. A channel unit (161) is formed between two adjacent baffles (18). The upper or lower parts of two adjacent channel units (161) are connected to form a filter channel (16) so that the solution flows in an S-shape in the filter channel (16). The inlet (151) is located on the upper part of the corresponding channel unit (161), and the outlet (152) is located on the inner wall of the corresponding channel unit (161). The channel unit (161) where the outlet (152) is located is connected to the lower part of the adjacent channel unit (161). The filter body (17) includes: a filter unit (171) corresponding to a plurality of channel units (161), and the filter unit (171) is provided with a plurality of filter holes arranged parallel to the axis of the liquid inlet pipe (15). The pore size of the filter holes of the multiple filter units (171) arranged from the liquid inlet (151) to the liquid outlet (152) decreases sequentially.

2. The single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference as described in claim 1, characterized in that, The surfaces of the first reflective sheet (12) and the second reflective sheet (32) are provided with a hydrophilic coating.

3. The single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference as described in claim 1, characterized in that, The density of the float (31) is less than the density of the solution in the guide tube (11).

4. The single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference as described in claim 1, characterized in that, The ultrasonic sensor assembly (2) includes: The sensor body (21) is used to transmit and receive ultrasonic waves; The sensor housing (22) is connected to the bottom of the conduit assembly (1), and the sensor body (21) is disposed inside the sensor housing (22); The protective tube (23) has one end sealed to the sensor housing (22), and the wire of the sensor body (21) is located inside the protective tube (23); The pagoda head (24) is fitted on the outside of the line body and is located at the connection between the protective tube (23) and the sensor housing (22).

5. The single ultrasonic head sensor for measuring density and liquid level with anti-bubble interference as described in claim 1, characterized in that, The top of the channel unit (161) is provided with spikes.

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