Ultrasonic sensor and speed correction method

Abstract

The invention discloses an ultrasonic sensor and a speed correction method, the ultrasonic sensor comprises a sensor body, a support, an elastic member and a binding member, the support is provided with a mounting cavity, the sensor body is arranged in the mounting cavity, the elastic member is arranged between the support and the sensor body, and the binding member is arranged on the outer surfaces of the support and a circular tubular object. When the support is stressed to be close to the circular-tube-shaped object and is in a contact state, the elastic piece is compressed, and the sensor body is in contact with the circular-tube-shaped object under the elastic force action of the elastic piece, so that the sensor body and the circular-tube-shaped object are in an elastic contact state. According to the invention, the elastic piece is arranged between the support and the sensor body, so that the sensor body forms an elastic contact state with the circular tubular object under the action of elastic force instead of rigid hard contact in the prior art, thereby reducing wrong electric signals caused by vibration of a non-measurement target, ensuring the stability of normal measurement signals, and improving the measurement accuracy. And the accuracy and the reliability of the measured data are obviously improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensors, in particular to an ultrasonic sensor and a speed correction method. BACKGROUND

[0002] In the actual installation and application of the ultrasonic sensor, the sensor is usually bound and fixed to the surface of the pipeline by a strap. However, the existing sensor and the pipeline form a rigid contact connection, and the vibration generated by the pipeline during operation can be directly conducted to the core component piezoelectric sheet inside the sensor through the hard contact. This non-measurement target vibration interference can cause the piezoelectric sheet to incorrectly sense and generate additional electrical signals, resulting in the normal measurement signal being severely disturbed, greatly reducing the accuracy and reliability of the measurement data. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art and provide an ultrasonic sensor and a speed correction method.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] On the one hand, the present application provides an ultrasonic sensor suitable for being installed on a circular tubular object, comprising a sensor body, a bracket, an elastic member and a binding member, the bracket is provided with a mounting cavity, the sensor body is arranged in the mounting cavity, the elastic member is arranged between the bracket and the sensor body, and the binding member is arranged on the outer surface of the circular tubular object, when the bracket is stressed to approach and contact the circular tubular object, the elastic member is compressed, and the sensor body is in contact with the circular tubular object under the elastic force of the elastic member, so that the sensor body and the circular tubular object are in an elastic contact state.

[0006] Further, the bracket has a vertical direction of freedom relative to the sensor body.

[0007] Further, the bottom of the bracket is in an open state.

[0008] Further, the bracket comprises a first side plate, a second side plate arranged opposite to the first side plate, and a top connecting plate connected to the top of the first side plate and the second side plate, and the first side plate, the second side plate and the top connecting plate constitute the mounting cavity.

[0009] Further, the bottoms of the first side plate and the second side plate are flush, and when the bracket is stressed to make the first side plate and the second side plate contact the surface of the circular tubular object, the first side plate and the second side plate respectively form radial limiting of the sensor body with the circular tubular object.

[0010] Further, the contact position of the first side plate, the second side plate and the surface of the circular tubular object is provided with a chamfered surface.

[0011] Further, the length direction of the elastic member is parallel to the vertical direction, the upper end of the elastic member abuts against the inner side surface of the top connecting plate, and the lower end of the elastic member abuts against the top of the sensor body.

[0012] Further, the first side plate is provided with a first limiting hole, the sensor body is provided with a first connecting hole corresponding to one side of the first side plate, a first connecting member is arranged in the first limiting hole and the first connecting hole, the second side plate is provided with a second limiting hole, the sensor body is provided with a second connecting hole corresponding to one side of the second side plate, a second connecting member is arranged in the second limiting hole and the second connecting hole, and the length direction of the first limiting hole and the second limiting hole extends in the vertical direction.

[0013] Further, the sensor body is provided with a temperature sensor, and the temperature sensor is arranged close to the bottom of the sensor body.

[0014] In another aspect, the application further provides an ultrasonic wave speed correction method of an ultrasonic wave sensor, which comprises the following steps:

[0015] The temperature sensor is used to obtain the current temperature of the fluid in the circular tubular object.

[0016] The propagation speed of the ultrasonic wave in the fluid is calculated according to the current temperature of the fluid in the circular tubular object, and the calculation formula is as follows:

[0017] C=C0+coefficient*(T-T0), wherein T is the current temperature of the fluid in the circular tubular object, coefficient is the change coefficient of the propagation speed of the ultrasonic wave in the fluid with the temperature, C0 is the propagation speed of the ultrasonic wave in the fluid at the temperature T0, and C is the propagation speed of the ultrasonic wave in the fluid at the temperature T.

[0018] The beneficial effect of the present application compared with the prior art is that the ultrasonic sensor comprises a sensor body, a bracket, an elastic member and a binding member, the bracket is provided with a mounting cavity, the sensor body is arranged in the mounting cavity, the elastic member is arranged between the bracket and the sensor body, and the binding member is arranged on the outer surface of the circular tubular object; when the bracket is forced to approach and contact the circular tubular object, the elastic member is compressed, and the sensor body is in contact with the circular tubular object under the elastic force of the elastic member, so that the sensor body and the circular tubular object are in an elastic contact state. The elastic member is arranged between the bracket and the sensor body, when the bracket is fixed to the surface of the circular tubular object by the binding member and is forced to approach, the elastic member is compressed and generates elastic force, and the sensor body is in an elastic contact state with the circular tubular object under the elastic force, instead of rigid hard contact in the prior art. The elastic contact structure can buffer the vibration generated during the running of the circular tubular object, and the force acting on the installation of the ultrasonic sensor is determined by the elastic member, so as to reduce the error electric signal caused by the vibration of the non-measurement target, ensure the stability of the normal measurement signal, and significantly improve the accuracy and reliability of the measurement data.

[0019] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, it can be implemented according to the content of the specification, and in order to make the above and other purpose characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0021] Figure 1 A structure schematic diagram of an ultrasonic sensor according to an embodiment of the present application (elastic member in compressed state);

[0022] Figure 2 A structure schematic diagram of an ultrasonic sensor according to an embodiment of the present application (elastic member in compressed state);

[0023] Figure 3 A structure schematic diagram of an ultrasonic sensor according to an embodiment of the present application (elastic member in compressed state);

[0024] Figure 4 A structure schematic diagram of an ultrasonic sensor according to an embodiment of the present application (elastic member in compressed state);

[0025] Figure 5 The change coefficient corresponding to different fluids at a certain temperature.

[0026] Reference signs

[0027] 1, sensor body; 11, second connecting hole; 12, positioning groove; 121, positioning protrusion; 2, bracket; 21, first side plate; 211, first limiting hole; 22, second side plate; 221, second limiting hole; 23, top connecting plate; 231, binding limiting groove; 232, positioning protruding column; 24, mounting cavity; 25, chamfered surface; 3, elastic member; 4, first connecting member; 5, second connecting member; 100, circular tubular object. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described clearly and completely below in combination with specific embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein are for purposes of description only and are not meant to be limiting.

[0034] As shown in Figures 1 to 4 The present application provides an ultrasonic sensor, which is suitable for being mounted on a circular tubular object 100, comprising a sensor body 1, a bracket 2, an elastic member 3 and a binding member (not shown in the figure). The bracket 2 is provided with a mounting cavity 24, the sensor body 1 is arranged in the mounting cavity 24, the elastic member 3 is arranged between the bracket 2 and the sensor body 1, and the binding member is arranged on the outer surface of the circular tubular object 100. When the bracket 2 is forced to approach and contact the circular tubular object 100, the elastic member 3 is compressed, and the sensor body 1 is in contact with the circular tubular object 100 under the elastic force of the elastic member 3, so that the sensor body 1 and the circular tubular object 100 are in an elastic contact state.

[0035] The elastic member 3 is preferably a coil spring, which has good elastic recovery performance, and the spring model with different stiffness coefficients can be selected according to the actual force requirement. The binding member is a stainless steel strap or a high-strength nylon strap, and the length thereof can be adjusted according to the outer diameter of the circular tubular object 100 to ensure reliable fixation of the bracket 2 and the circular tubular object 100.

[0036] During assembly, first, the sensor body 1 is placed into the mounting cavity 24 of the bracket 2, so that the top of the sensor body 1 faces upward and the bottom faces downward; then, the elastic member 3 is arranged between the bracket 2 and the sensor body 1, and specifically, the upper end of the elastic member 3 is in abutment with the inner wall of the top of the bracket 2, and the lower end is in abutment with the top center position of the sensor body 1, at this time, the elastic member 3 is in a natural stretched state (at this time, the elastic member 3 is not compressed, as shown in Figure 1the state shown). Then, the bracket 2 equipped with the sensor body 1 and the elastic member 3 is placed at the preset installation position of the circular tubular object 100, and the outer surface of the bracket 2 and the circular tubular object 100 is wound with the binding member and gradually tightened; as the binding member is tightened, the bracket 2 is forced to move towards the circular tubular object 100 until the bottom of the bracket 2 is in contact with the surface of the circular tubular object 100, at which time the elastic member 3 is compressed between the top of the bracket 2 and the sensor body 1, generating a downward elastic force; under the action of the elastic force, the bottom of the sensor body 1 is in abutment with the outer surface of the circular tubular object 100, forming an elastic contact state (at this time, the elastic member 3 is in a compressed state, as shown in the state shown). Figure 2

[0037] The elastic contact between the sensor body 1 and the circular tubular object 100 achieved by the elastic member 3, rather than the rigid hard contact in the prior art, can effectively buffer the mechanical impact of the circular tubular object 100 during operation due to fluid flow, vibration, etc., reduce false electrical signals caused by non-measurement target vibration, and ensure the stability of ultrasonic signal transmission. At the same time, the elastic contact structure avoids rigid friction and collision between the sensor body 1 and the bracket 2 and the circular tubular object 100, reduces the probability of component wear and tear, and prolongs the overall service life of the sensor. In addition, the elastic force of the elastic member 3 can be flexibly adjusted by selecting elastic members 3 with different parameters or adjusting the tightening degree of the binding member, so that the sensor body 1 can still maintain reliable contact when there is a size deviation or slight deformation of the circular tubular object 100, improving the installation adaptability of the sensor.

[0038] In an embodiment, the bracket 2 has a vertical degree of freedom relative to the sensor body 1. The advantage of this design is that the vertical degree of freedom enables the sensor body 1 to flexibly adjust the contact position with the circular tubular object 100 under the action of the elastic force of the elastic member 3, so that even in the case of vibration, slight size deviation of the circular tubular object 100, or slight inclination of the installation angle of the bracket 2, the bracket 2 can still maintain close contact with the circular tubular object 100 through its vertical movement.

[0039] In an embodiment, the bottom of the bracket 2 is in an open state. This design provides a channel for the sensor body 1 to directly contact the circular tubular object 100, avoiding obstruction or hindrance of the sensor body 1 by the structure of the bottom of the bracket 2, ensuring that the sensor body 1 can form contact with the surface of the circular tubular object 100 under the action of the elastic member 3 without interference, and ensuring effective transmission of ultrasonic signals. Moreover, the open-bottom design reduces the number of components of the bracket 2, eliminates the need for an additional bottom closure structure, reduces the processing complexity and assembly difficulty of the bracket 2, and reduces the overall weight of the bracket 2, facilitating installation and operation.

[0040] In an embodiment, as shown in FIG. 6, the bracket 2 is provided with a plurality of elastic members 3, and the elastic members 3 are arranged in a staggered manner. Figure 4 ​As shown, the bracket 2 comprises a first side plate 21, a second side plate 22 arranged opposite to the first side plate 21, and a top connecting plate 23 connected to the top of the first side plate 21 and the second side plate 22, and the first side plate 21, the second side plate 22 and the top connecting plate 23 form a mounting cavity 24.

[0041] The first side plate 21 and the second side plate 22 are rectangular plate structures made of stainless steel or high-strength engineering plastic, and are arranged in parallel and opposite to each other with a spacing slightly larger than the width of the sensor body 1 to reserve an assembly gap. The top connecting plate 23 is a rectangular plate with a width matching that of the side plates and a thickness consistent with that of the side plates, and is fixedly connected to the top ends of the first side plate 21 and the second side plate 22 at both ends thereof by welding, bolt connection or one-piece injection molding to form a “” shaped frame structure, and the three together enclose the mounting cavity 24 for accommodating the sensor body 1. The cross-sectional shape of the mounting cavity 24 is adapted to the cross-sectional shape of the sensor body 1, and the inner wall of the cavity is smooth without burrs to avoid scratching the surface of the sensor body 1.

[0042] The frame structure formed by the first side plate 21, the second side plate 22 and the top connecting plate 23 is highly rigid and can withstand the tightening force of the binding member and the vibration impact of the circular tubular object 100, avoiding deformation of the bracket 2 in long-term use and ensuring the dimensional stability of the mounting cavity 24 to provide a reliable load-bearing foundation for the sensor body 1. At the same time, the oppositely arranged first side plate 21 and second side plate 22 can form lateral limiting for the sensor body 1 to limit its horizontal deviation, and the top connecting plate 23 provides vertical force support for the sensor body 1 through cooperation with the elastic member 3, and the three together guide the sensor body 1 to move along the preset path to ensure the stability of the elastic contact.

[0043] In an embodiment, as shown in Figure 2 The bottoms of the first side plate 21 and the second side plate 22 are flush, and when the bracket 2 is stressed to make the first side plate 21 and the second side plate 22 contact the surface of the circular tubular object 100, the first side plate 21 and the second side plate 22 respectively form radial limiting for the sensor body 1 with the circular tubular object 100.

[0044] The bottom edges of the first side plate 21 and the second side plate 22 are chamfered or polished to be flush, that is, the bottom ends of the two side plates are located on the same horizontal plane, so that the bracket 2 can be in contact with the surface of the circular tubular object 100 at the same time when the bracket 2 is stressed. The length direction of the bottom of the first side plate 21 and the second side plate 22 is parallel to the axis direction of the circular tubular object 100. When the bracket 2 is fixed to the outer surface of the circular tubular object 100 by the binding member, the tightening force of the binding member makes the bracket 2 close to the circular tubular object 100 until the bottom edges of the first side plate 21 and the second side plate 22 are tightly attached to the surface of the circular tubular object 100. At this time, the first side plate 21 and the second side plate 22 are located on the two sides of the circular tubular object 100, respectively, and the distance between the two side plates is less than the outer diameter of the circular tubular object 100. The contact between the inner side of the side plate and the outer surface of the circular tubular object 100 forms a clamping tendency, so that the sensor body 1 is automatically positioned by the first side plate 21 and the second side plate 22, and the central axis of the sensor body 1 is automatically aligned with the central axis of the circular tubular object 100, which can ensure the accuracy of installation and guarantee the measurement accuracy.

[0045] In an embodiment, as shown in Figure 4 The contact positions of the first side plate 21 and the second side plate 22 with the surface of the circular tubular object 100 are provided with chamfered surfaces 25. The chamfered surfaces 25 can be horizontal surfaces or arc surfaces compatible with the arc of the outer diameter of the circular tubular object 100.

[0046] In this embodiment, the contact positions of the first side plate 21 and the second side plate 22 with the surface of the circular tubular object 100 are provided with chamfered surfaces 25. The core is to optimize the structure of the contact position of the side plate, improve the fitting effect of the bracket 2 and the circular tubular object 100, reduce the contact stress, and enhance the guiding property in the installation process. The specific structure and implementation mode are as follows:

[0047] When the chamfered surface 25 adopts a horizontal surface form, the chamfered surface 25 is a plane inclined inward along the bottom edge of the side plate (referring to the first side plate 21 and the second side plate 22), and the inclination angle is 30°-45°, and the chamfer width is 5-10mm, so that the bottom of the side plate forms a “chamfered edge” structure, avoiding the sharp edge directly contacting the surface of the circular tubular object 100.

[0048] When the chamfered surface 25 adopts an arc surface form, the arc of the chamfered surface 25 is compatible with the arc of the outer diameter of the circular tubular object 100, so as to form a line contact or a small area surface contact with the outer surface of the circular tubular object 100.

[0049] The chamfered surface 25 disperses the tightening force of the bracket 2 to a larger contact area by increasing the contact area or optimizing the contact angle, avoids the sharp edge of the bottom of the side plate causing local stress concentration on the surface of the circular tubular object 100, protects the outer surface of the circular tubular object 100 (especially the anticorrosion layer of the metal pipeline or the surface of the plastic pipeline) from being damaged, and prolongs the service life of the pipeline.

[0050] Furthermore, the inclined or arc-shaped structure of the chamfered surface 25 plays an automatic centering role during installation. Even if the bracket 2 is initially placed in a slightly offset position, the interaction force between the surface of the round tubular object 100 and the chamfered surface 25 can push the bracket 2 to adjust to a symmetrical position during the tightening of the binding member, ensuring that the first side plate 21 and the second side plate 22 are uniformly stressed, reducing the workload of manual calibration.

[0051] In an embodiment, the length direction of the elastic member 3 is parallel to the vertical direction, the upper end of the elastic member 3 abuts against the inner side surface of the top connecting plate 23, and the lower end of the elastic member 3 abuts against the top of the sensor body 1. Such a design utilizes the axial deformation of the elastic member 3 to provide a vertical elastic force, ensuring that the sensor body 1 forms a stable elastic contact with the round tubular object 100. In order to improve the uniformity and stability of the elastic force transmission, multiple elastic members 3 can be provided.

[0052] In an embodiment, as shown in Figure 3 , the top of the sensor body 1 is provided with a positioning groove 12, and the center of the positioning groove 12 is upwardly extended to be provided with a positioning protrusion 121. Correspondingly, the inner side surface of the top connecting plate 23 is provided with a positioning protrusion 232 corresponding to the position of the positioning protrusion 121.

[0053] Specifically, the top center area of the sensor body 1 is provided with one or more circular positioning grooves 12, and the groove bottom of the positioning groove 12 is a flat surface for accommodating the lower end of the elastic member 3. The center position of the positioning groove 12 is upwardly extended to form a cylindrical positioning protrusion 121, and the surface of the positioning protrusion 121 is smooth and perpendicular to the top of the sensor body 1, and the axis of the positioning protrusion 121 coincides with the axis of the positioning groove 12. Correspondingly, the inner side surface (the side facing the mounting cavity 24) of the top connecting plate 23 is provided with one or more cylindrical positioning protrusions 232 corresponding to the position of the positioning protrusion 121, and the axis of the positioning protrusion 232 is collinear with the axis of the positioning protrusion 121. The number of positioning protrusions 232 is consistent with the number of positioning protrusions 121, and the lower end surface of the positioning protrusion 232 is spaced apart from the upper end surface of the positioning protrusion 121 to avoid direct contact between them.

[0054]

[0055] ​The elastic member 3 (such as a coil spring) is assembled with the lower end embedded in the positioning groove 12 at the top of the sensor body 1, and sleeved outside the positioning protrusion 121, the inner diameter of the elastic member 3 is slightly smaller than the diameter of the positioning protrusion 121, so that the two form an interference fit, ensuring that the positioning protrusion 121 forms radial positioning for the lower end of the elastic member 3; the upper end of the elastic member 3 is sleeved outside the positioning convex column 232 of the top connecting plate 23, the inner diameter of the elastic member 3 is slightly smaller than the diameter of the positioning convex column 232, so that the two form an interference fit, and the positioning convex column 232 forms radial constraint for the upper end of the elastic member 3. At this time, the length direction of the elastic member 3 extends along the axis of the positioning protrusion 121 and the positioning convex column 232 (that is, the vertical direction), and the two ends are respectively abutted with the groove bottom of the positioning groove 12 and the inner side of the top connecting plate 23, forming a "double positioning" structure. When the elastic member 3 is compressed or stretched, the positioning protrusion 121 and the positioning convex column 232 jointly limit the lateral deviation of the elastic member 3, ensuring that it only deforms along the vertical direction.

[0056] The cooperation structure of the positioning groove 12, the positioning protrusion 121 and the positioning convex column 232 forms double radial positioning for the upper and lower ends of the elastic member 3, effectively preventing the elastic member 3 from tilting, turning over or falling off during force deformation, ensuring that the elastic member 3 always transmits elastic force along the vertical direction, avoiding uneven force on the sensor body 1 due to deviation of the elastic member 3.

[0057] In an embodiment, as shown in Figure 4 The first side plate 21 is provided with a first limiting hole 211, and the sensor body 1 is provided with a first connecting hole corresponding to one side of the first side plate 21, a second limiting hole 221 is arranged on the second side plate 22, and the sensor body 1 is provided with a second connecting hole 11 corresponding to one side of the second side plate 22, a second connecting member 5 is arranged in the second limiting hole 221 and the second connecting hole 11, and the length direction of the first limiting hole 211 and the second limiting hole 221 extends in the vertical direction.

[0058] Specifically, the first side plate 21 is provided with a first limiting hole 211, and the second side plate 22 is provided with a second limiting hole 221 corresponding thereto, the first limiting hole 211 and the second limiting hole 221 are both long strip holes extending in the vertical direction, and the central axis thereof coincides with the vertical center line of the side plate, ensuring balanced force.

[0059] The sensor body 1 is provided with a first connecting hole in the middle of the side wall corresponding to the first side plate 21, and a second connecting hole 11 in the middle of the side wall corresponding to the second side plate 22, and the connecting hole is a blind hole with internal threads. The first connecting member 4 and the second connecting member 5 are both bolts (such as cross slot countersunk head bolts), the rod diameter of which is adapted to the width of the limiting hole (referring to the first limiting hole 211 and the second limiting hole 221), and the head diameter is larger than the width of the limiting hole, so as to avoid the connecting member (referring to the first connecting member 4 and the second connecting member) from falling out of the limiting hole.

[0060] When assembling, the sensor body 1 is placed into the mounting cavity 24 of the bracket 2, the first connecting hole is aligned with the first limiting hole 211, and the second connecting hole 11 is aligned with the second limiting hole 221; then the first connecting piece 4 is inserted through the first limiting hole 211 and screwed into the first connecting hole, and the second connecting piece 5 is inserted through the second limiting hole 221 and screwed into the second connecting hole 11, and the connecting piece is screwed to the head slightly abutting the outer side of the side plate, at this time the connecting piece can slide freely along the length direction of the limiting hole. When the elastic piece 3 is compressed or stretched, the sensor body 1 moves along the vertical direction of the limiting hole through the connecting piece, and the movement stroke is limited by the length of the limiting hole, realizing the vertical activity freedom of the bracket 2 relative to the sensor body 1.

[0061] The vertically extending limiting hole cooperates with the connecting piece to provide accurate guidance for the vertical movement of the sensor body 1, limit the offset amount in the horizontal direction, ensure that the sensor body 1 always moves along the preset path, avoid the deviation of the contact position caused by lateral shaking, and guarantee the stability of the ultrasonic signal transmission. At the same time, the length of the limiting hole directly limits the maximum movement distance of the sensor body 1, which can be designed according to the compression amount requirement of the elastic piece 3, prevents the sensor body 1 from moving excessively to cause overtravel damage of the elastic piece 3 or rigid collision with the circular tubular object 100, and improves the safety and reliability of the structure.

[0062] In an embodiment, a temperature sensor is arranged in the sensor body 1, and the temperature sensor is arranged close to the bottom of the sensor body 1.

[0063] In this embodiment, the temperature sensor is integrated in the sensor body 1, and the temperature sensor is arranged close to the bottom of the sensor body 1, which collects the temperature signal of the surface of the circular tubular object 100 at close range, provides accurate temperature parameters for the correction of the ultrasonic propagation speed, and ensures the accuracy of the measurement result.

[0064] In order to avoid the interference of the shell of the sensor body 1 on the detection of the temperature sensor, the shell of the sensor body 1 is made of metal material and adopts a sheet structure. The temperature sensor can adopt a patch type thermocouple (such as K type thermocouple) or a digital temperature chip.

[0065] In an embodiment, as shown in FIG. 6, the bracket 2 is arranged on the side of the sensor body 1, and the bracket 2 is arranged on the side of the sensor body 1. Figure 4As shown, the surface of the bracket 2 is provided with a binding limiting groove 231. Specifically, the binding limiting groove 231 is arranged on the middle part of the outer surface of the top connecting plate 23 and extends along the length direction thereof. The cross section of the binding limiting groove 231 is arc-shaped or U-shaped. When the binding member is assembled, it is embedded in the binding limiting groove 231 and wound around the outer surface of the circular tubular object 100. At this time, the inner side wall of the binding limiting groove 231 radially restricts the binding member, preventing the binding member from sliding or falling off along the surface of the bracket 2 during the tightening process, thereby improving the stability and reliability of the binding.

[0066] The embodiment of the present application also provides an ultrasonic wave speed correction method of an ultrasonic wave sensor, comprising the following steps:

[0067] S10, acquiring the current temperature of the fluid in the circular tubular object by using a temperature sensor.

[0068] In the implementation, the temperature sensor communicates with the sensor control unit through an I2C or single bus interface and collects temperature data once every 100 ms.

[0069] S20, calculating the propagation speed of the ultrasonic wave in the fluid according to the current temperature of the fluid in the circular tubular object, wherein the calculation formula is:

[0070] C=C0+coefficient*(T-T0), wherein T is the current temperature of the fluid in the circular tubular object, coefficient is the change coefficient of the propagation speed of the ultrasonic wave in the fluid with temperature, C0 is the propagation speed of the ultrasonic wave in the fluid at temperature T0, and C is the propagation speed of the ultrasonic wave in the fluid at temperature T.

[0071] As shown in the table, Figure 5 as shown in the table, Figure 5 the change coefficients corresponding to different fluids at T0=25℃ are listed. In the implementation, when the current temperature of the fluid in the circular tubular object is acquired, the propagation speed of the ultrasonic wave in the fluid at the current temperature of the fluid in the circular tubular object is calculated according to the formula of the change of the propagation speed of the ultrasonic wave in the fluid with temperature, and the propagation speed is taken as the corrected propagation speed. After the corrected propagation speed is obtained, the flow rate of the fluid can be more accurately measured.

[0072] It should be noted that the measurement principle of the ultrasonic wave sensor is to measure the flow rate of the fluid by using the time difference of the ultrasonic wave transmission between the upstream sensor and the downstream sensor.

[0073] The time difference of the ultrasonic wave between the upstream and the downstream is:

[0074] Δt=t up -t dowm =L / cosθ(1 / (C-Vcosθ)-1 / (C+Vcosθ), which is simplified to:

[0075] Δt = 2LV / (C 2 -V 2 cos 2 θ);

[0076] Since V is much smaller than C, Δt = 2LV / C 2 ;

[0077] In the above formula, V is the flow rate of the fluid, t up is the upstream time, t down is the downstream time, Δt is the time difference between the upstream and downstream, L is the projection of the propagation path of the ultrasonic wave in the fluid in the direction of the circular tubular object.

[0078] The overall working process is as follows:

[0079] Assembly and fixing stage: first, place the elastic member in the mounting cavity of the bracket, and arrange the length direction of the elastic member along the vertical direction. Then, assemble the sensor body into the mounting cavity of the bracket, so that the first connecting hole and the second connecting hole on both sides of the sensor body are respectively aligned with the first limiting hole and the second limiting hole of the first side plate and the second side plate of the bracket, and are fixed by the first connecting piece and the second connecting piece. Reserve the space for the vertical movement of the sensor body along the limiting hole, and the upper end of the elastic member abuts against the top connecting plate and the lower end abuts against the sensor body. Finally, wrap the bundling limiting groove on the surface of the bracket with the outer surface of the circular tubular object by the bundling piece and tighten it. The bracket is stressed to approach the circular tubular object until the chamfered surface at the bottom of the first side plate and the second side plate contacts the surface of the circular tubular object. At this time, the elastic member is compressed and generates elastic force.

[0080] Elastic contact maintenance stage: under the action of the elastic force of the elastic member, the bottom of the sensor body forms a close elastic contact state with the surface of the circular tubular object. The first side plate and the second side plate of the bracket constitute radial limiting for the sensor body by contacting the circular tubular object, limiting its lateral deviation; at the same time, the sensor body can move up and down along the vertically extending limiting hole through the connecting piece, and cooperate with the deformation of the elastic member to buffer the vibration of the circular tubular object in the running process. The open state of the bottom of the bracket provides space for the contact between the sensor body and the circular tubular object, ensuring the stability of the ultrasonic signal transmission path.

[0081] Temperature correction and measurement stage: the temperature sensor arranged near the bottom in the sensor body collects the current temperature of the fluid in the circular tubular object in real time. According to the collected temperature value, the propagation speed of the ultrasonic wave at the current temperature is calculated by using the formula, and the influence of temperature on the propagation speed of the ultrasonic wave is compensated by this correction method. Combined with the stable elastic contact between the sensor body and the circular tubular object, the accuracy and reliability of the ultrasonic measurement signal are ensured.

[0082] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An ultrasonic sensor adapted to be mounted on a circular tubular object, characterized in that, The sensor body, the bracket, the elastic member and the binding member are provided, the bracket is provided with a mounting cavity, the sensor body is arranged in the mounting cavity, the elastic member is arranged between the bracket and the sensor body, and the binding member is arranged on the outer surface of the circular tubular object.

2. An ultrasonic sensor according to claim 1, characterized in that The bracket has a vertical direction freedom degree relative to the sensor body.

3. An ultrasonic sensor according to claim 1, wherein The bottom of the bracket is in an open state.

4. The ultrasonic sensor of claim 1, wherein, The bracket comprises a first side plate, a second side plate arranged opposite to the first side plate, and a top connecting plate connected to the top of the first side plate and the second side plate, and the first side plate, the second side plate and the top connecting plate form the mounting cavity.

5. An ultrasonic sensor according to claim 4, wherein The bottom of the first side plate and the second side plate is flush, and when the bracket is forced to make the first side plate, the second side plate and the surface of the circular tubular object contact, the first side plate and the second side plate respectively form radial limitation of the sensor body with the circular tubular object.

6. An ultrasonic sensor according to claim 4, wherein, The contact position of the first side plate, the second side plate and the surface of the circular tubular object is provided with a chamfer surface.

7. An ultrasonic sensor according to claim 4, wherein The length direction of the elastic member is parallel to the vertical direction, the upper end of the elastic member abuts against the inner side surface of the top connecting plate, and the lower end of the elastic member abuts against the top of the sensor body.

8. An ultrasonic sensor according to claim 4, wherein, The first side plate is provided with a first limiting hole, the sensor body is provided with a first connecting hole corresponding to one side of the first side plate, a first connecting member is arranged in the first limiting hole and the first connecting hole, the second side plate is provided with a second limiting hole, the sensor body is provided with a second connecting hole corresponding to one side of the second side plate, and a second connecting member is arranged in the second limiting hole and the second connecting hole, and the length direction of the first limiting hole and the second limiting hole extends to the vertical direction.

9. An ultrasonic sensor according to any one of claims 1-8, characterized in that The temperature sensor is arranged close to the bottom of the sensor body.

10. An ultrasonic velocity correction method for an ultrasonic sensor, characterized by, Comprise: The current temperature of the fluid in the circular tubular object is obtained by using the temperature sensor; The propagation speed of the ultrasonic wave in the fluid is calculated according to the current temperature of the fluid in the circular tubular object, and the calculation formula is: C=C0+coefficient*(T-T0), wherein T is the current temperature of the fluid in the circular tubular object, coefficient is the change coefficient of the propagation speed of the ultrasonic wave in the fluid with temperature, C0 is the propagation speed of the ultrasonic wave in the fluid at temperature T0, and C is the propagation speed of the ultrasonic wave in the fluid at temperature T.

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