Anti-corrosion ultrasonic liquid level meter and assembling method thereof

Abstract

The invention relates to the technical field of liquid level meters, and discloses an anti-corrosion ultrasonic liquid level meter and an assembling method.The anti-corrosion ultrasonic liquid level meter comprises an anti-corrosion shell, an anti-corrosion sound window and a piezoelectric assembly, the anti-corrosion shell is tubular and provided with a cavity, and the first end of the anti-corrosion shell is arranged in a penetrating mode; a limiting part is convexly arranged on the inner wall, relatively close to the first end, of the anti-corrosion shell in the direction close to the axis of the anti-corrosion shell; the anti-corrosion acoustic window is arranged in the anti-corrosion shell and is adhered to the limiting part; the piezoelectric assembly is arranged in the anti-corrosion shell and fixedly connected with the anti-corrosion acoustic window, and on the basis that the anti-corrosion ultrasonic liquid level meter obtains enough measuring range and accuracy, the production cost and the production difficulty can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of liquid level gauges, and in particular to an anti-corrosion ultrasonic liquid level gauge and an assembly method thereof. Background Art

[0002] Ultrasonic level meter is a digital level meter controlled by a microprocessor. The working principle of ultrasonic level meter is that the transducer sends out ultrasonic pulses, which are reflected back when encountering the surface of the measured medium. Part of the reflected echo is received by the transducer and converted into an electrical signal through a piezoelectric crystal or magnetostrictive device. The distance from the sensor to the measured liquid surface is calculated by the time between the emission and reception of the sound wave. Due to the non-contact measurement, the measured medium is almost unlimited, and it can be widely used to measure the height of various liquids and solid materials.

[0003] In order to improve the measurement capability and service life of ultrasonic level meters in the environment of tanks filled with corrosive media, existing ultrasonic level meters usually replace the entire shell with anti-corrosion materials (specifically PVDF materials). The shells of existing ultrasonic level meters mostly adopt a cup-shaped structure, and the anti-corrosion material (PVDF material) has the characteristics of high density, resulting in a thicker bottom surface of the shell near the transducer emitting surface (0.6mm or even higher), and the acoustic impedance of the PVDF material on the bottom of the shell is extremely high, which will greatly weaken the intensity of ultrasonic waves and seriously affect the range and accuracy of the ultrasonic level meter. In order to reduce the influence of PVDF thickness on ultrasonic waves, additional costs and processes are required to further cut the PVDF material on the bottom of the shell, resulting in a cost surge. Summary of the invention

[0004] In view of this, the present invention provides an anti-corrosion ultrasonic level meter and an assembly method thereof to solve the problem that the existing ultrasonic level meter with anti-corrosion function requires a high production cost to obtain a sufficient range and accuracy.

[0005] In a first aspect, the present invention provides an anti-corrosion ultrasonic level meter, comprising:

[0006] The anti-corrosion shell is arranged in a tubular shape and has a cavity, the first end of the anti-corrosion shell is arranged through, and the inner wall of the anti-corrosion shell close to the first end is provided with a stopper protruding in a direction close to the axis of the anti-corrosion shell;

[0007] An anti-corrosion sound window is arranged in the anti-corrosion shell and bonded to the limiting portion;

[0008] The piezoelectric component is arranged in the anti-corrosion shell and is fixedly connected to the anti-corrosion acoustic window.

[0009] The anti-corrosion ultrasonic level meter according to the present invention has at least the following beneficial effects:

[0010] By setting the anti-corrosion shell, anti-corrosion acoustic window and piezoelectric component separately, and using anti-corrosion materials to make the anti-corrosion shell and anti-corrosion acoustic window respectively, compared with the traditional cup-shaped structure shell, which requires multiple cutting to reduce the thickness of the "cup bottom" as much as possible in order for the ultrasonic level meter to obtain sufficient measurement accuracy, the anti-corrosion ultrasonic level meter can separate the "cup bottom" part of the anti-corrosion shell (i.e., the anti-corrosion acoustic window) from the anti-corrosion shell for separate processing, thereby reducing the difficulty and cost of producing an anti-corrosion acoustic window with a thickness less than or equal to 0.4mm, and use the limiting part to locate the assembly position of the anti-corrosion acoustic window in the first end opening of the anti-corrosion shell, and bond them together, so that the anti-corrosion acoustic window with a thickness less than or equal to 0.4mm can block the first end opening of the anti-corrosion shell, thereby reducing the production cost and difficulty on the basis of obtaining sufficient measurement range and accuracy of the anti-corrosion ultrasonic level meter.

[0011] In an optional embodiment, the limiting portion is arranged in a ring shape, and a glue injection groove is opened on the end surface where the limiting portion and the anti-corrosion sound window are bonded. The glue injection groove is arranged around a circle, and the glue injection groove is filled with a first adhesive for bonding the anti-corrosion sound window and the limiting portion.

[0012] In an optional embodiment, the inner side wall of the glue injection groove relatively close to the axis of the anti-corrosion shell is set as an inclined surface, and the inclined surface extends along the axial direction of the anti-corrosion shell from the top end of the limiting part to the bottom end of the limiting part, and the inclined surface is inclined away from the direction of the axis of the anti-corrosion shell.

[0013] In an optional embodiment, the piezoelectric component includes a piezoelectric unit and a matching layer, the matching layer is connected to the anti-corrosion acoustic window via a second adhesive, and the piezoelectric unit is arranged on a side of the matching layer relatively away from the anti-corrosion acoustic window; the outer surface of the piezoelectric unit and part of the outer surface of the matching layer are provided with a copper cladding layer.

[0014] In an optional embodiment, a wave absorbing layer is provided between at least part of the outer surface of the piezoelectric unit and the copper cladding layer;

[0015] And / or, an absorbing layer is disposed between at least part of the matching layer and the copper cladding layer.

[0016] In an optional embodiment, a connector is threadedly connected to one end of the anti-corrosion shell relatively far from the anti-corrosion acoustic window, and a meter head is detachably connected to one end of the connector relatively far from the anti-corrosion shell.

[0017] In an optional embodiment, the connecting member is provided with a plurality of threaded holes arranged at intervals on the end face relatively close to the header, and a through hole is formed on the header at a position corresponding to the threaded holes and extending axially through the header, wherein the through hole is used for the rod of the connecting bolt to pass through, and the connecting bolt matches the threaded hole.

[0018] In a second aspect, the present invention further provides an assembly method, which is used to assemble the anti-corrosion ultrasonic level meter provided in the first aspect, and the spraying method comprises the following steps:

[0019] Bonding the piezoelectric component and the anti-corrosion acoustic window into one body;

[0020] Applying a first adhesive to the top of the limiting portion;

[0021] The piezoelectric component and the anti-corrosion sound window are placed together in an anti-corrosion housing, and the anti-corrosion sound window is abutted against the top end of the limiting portion, so that the first adhesive bonds the anti-corrosion sound window and the limiting portion into one.

[0022] An assembly method according to the present invention has at least the following beneficial effects:

[0023] By setting the anti-corrosion shell, anti-corrosion acoustic window and piezoelectric component separately, during the assembly process, the anti-corrosion shell and the anti-corrosion acoustic window can be first made of anti-corrosion materials respectively, and then the piezoelectric component and the anti-corrosion acoustic window can be bonded together. The assembly position of the anti-corrosion acoustic window in the first end opening of the anti-corrosion shell can be positioned by using the limiting part, and the anti-corrosion acoustic window and the limiting part can be bonded together with the first adhesive. The piezoelectric component can then be assembled in the anti-corrosion shell. The entire assembly process is simple to operate, and the assembled anti-corrosion ultrasonic level meter has sufficient measurement range and accuracy on the basis of anti-corrosion performance.

[0024] In an optional embodiment, before placing the piezoelectric component and the anti-corrosion acoustic window together in the anti-corrosion housing, the process further includes filling the first adhesive into the glue injection groove.

[0025] In an optional embodiment, the first adhesive is tetrafluoroethylene glue;

[0026] When the piezoelectric component and the anti-corrosion acoustic window are bonded together, a second adhesive is used to complete the bonding between the piezoelectric component and the anti-corrosion acoustic window, and the second adhesive is a polytetrafluoroethylene surface treatment agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the main structure of a partial cross-section of an anti-corrosion ultrasonic level meter according to an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure with part of the header removed;

[0030] Figure 3 It is a schematic diagram of the three-dimensional structure of an anti-corrosion ultrasonic level meter with the meter head removed according to an embodiment of the present invention;

[0031] Figure 4 It is a schematic cross-sectional structural diagram of the assembly of the anti-corrosion housing, the anti-corrosion acoustic window and the piezoelectric component in an embodiment of the present invention;

[0032] Figure 5 for Figure 4 The enlarged schematic diagram of point A in the middle;

[0033] Figure 6 It is a schematic diagram of the three-dimensional structure of the cross-section of the piezoelectric component and the anti-corrosion acoustic window in an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 100-anticorrosion housing, 110-limiting portion, 111-glue injection groove, 1111-inclined surface, 120-internal thread portion, 130-force applying portion;

[0036] 200-anti-corrosion acoustic windows;

[0037] 300-piezoelectric component, 310-piezoelectric unit, 320-matching layer, 321-lead hole, 330-copper cladding layer, 340-absorbing layer, 341-wire slot;

[0038] 400-connecting piece, 410-threaded hole, 420-clamping opening, 430-positioning part, 440-sealing ring;

[0039] 500-meter head, 510-connecting bolt. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] In the description of this embodiment, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting this embodiment. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0042] In the description of this embodiment, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0043] Combine the following Figures 1 to 6 , describing an embodiment of the present invention.

[0044] According to a first aspect of an embodiment of the present invention, an anti-corrosion ultrasonic level meter is provided, comprising an anti-corrosion shell 100, an anti-corrosion acoustic window 200 and a piezoelectric component 300. The anti-corrosion shell 100 is tubular and has a cavity. The first end of the anti-corrosion shell 100 is penetrated, and an inner wall of the anti-corrosion shell 100 relatively close to the first end is provided with a limiting portion 110 protruding toward the axis direction of the anti-corrosion shell 100; the anti-corrosion acoustic window 200 is arranged in the anti-corrosion shell 100 and is bonded to the limiting portion 110 and arranged in the anti-corrosion shell 100; the piezoelectric component 300 is arranged in the anti-corrosion shell 100 and is fixedly connected to the anti-corrosion acoustic window 200.

[0045] The anti-corrosion ultrasonic level meter of this embodiment is formed by separating the anti-corrosion shell 100, the anti-corrosion acoustic window 200 and the piezoelectric component 300, and using anti-corrosion materials to make the anti-corrosion shell 100 and the anti-corrosion acoustic window 200 respectively. Compared with the traditional cup-shaped shell, which requires multiple cutting to reduce the thickness of the "cup bottom" as much as possible to enable the ultrasonic level meter to obtain sufficient measurement accuracy, the anti-corrosion ultrasonic level meter of this embodiment can separate the "cup bottom" part of the anti-corrosion shell 100 (that is, the anti-corrosion acoustic window 200) from the anti-corrosion shell 100. The anti-corrosion acoustic window 200 with a thickness less than or equal to 0.4 mm is processed independently to reduce the difficulty and cost of producing the anti-corrosion acoustic window 200 with a thickness less than or equal to 0.4 mm, and the anti-corrosion acoustic window 200 is positioned at the assembly position in the first end opening of the anti-corrosion shell 100 by using the limiting portion 110, and is bonded together so that the anti-corrosion acoustic window 200 with a thickness less than or equal to 0.4 mm can seal the first end opening of the anti-corrosion shell 100, thereby achieving the reduction of production cost and difficulty on the basis of obtaining a sufficient measurement range and accuracy of the anti-corrosion ultrasonic level meter in this embodiment.

[0046] It should be noted that the anti-corrosion acoustic window 200 with a thickness less than or equal to 0.4 mm makes the thickness of the part close to the emitting surface of the piezoelectric component 300 thinner, and the acoustic impedance of the anti-corrosion acoustic window 200 with a thickness less than or equal to 0.4 mm is lower, thereby reducing the attenuation effect on the ultrasonic signal, thereby enabling the anti-corrosion ultrasonic level meter of this embodiment to obtain sufficient measurement range and accuracy.

[0047] It can be understood that, in order to facilitate the description of the axial direction of the anti-corrosion housing 100, this embodiment uses Figure 4 The axial direction shown in FIG. 1 is used as an illustration of the axial direction of the anti-corrosion housing 100 , but should not be understood as a clear limitation on the axial direction of the anti-corrosion housing 100 .

[0048] It can be understood that the first end mentioned in the text refers to the opposite end of the anti-corrosion housing 100 along the axial direction of the anti-corrosion housing 100. For the convenience of description, this embodiment uses Figure 4 The relative bottom end of the middle anti-corrosion shell 100 along the axial direction of the anti-corrosion shell 100 is described as the first end, but it should not be understood as a clear limitation on the first end.

[0049] It can be understood that the anti-corrosion acoustic window 200 cooperates with the internal gap of the anti-corrosion shell 100 so that the piezoelectric component 300 and the anti-corrosion acoustic window 200 bonded together can be placed together in the anti-corrosion shell 100 for assembly.

[0050] In specific applications, the cross-sectional shape of the anti-corrosion shell 100 perpendicular to the axial direction is set to be circular, rectangular or other polygonal; in this embodiment, the cross-sectional shape of the anti-corrosion shell 100 perpendicular to the axial direction is preferably circular, and the anti-corrosion sound window 200 is set in a disc shape, which is more conducive to reducing the difficulty and cost of producing an anti-corrosion sound window 200 with a thickness less than or equal to 0.4 mm.

[0051] like Figure 4 and Figure 5 As shown, in some embodiments, the anti-corrosion sound window 200 is bonded to the end face of the limiting part 110 relatively far away from the first end; the limiting part 110 is arranged in an annular shape, and the end face of the limiting part 110 and the anti-corrosion sound window 200 bonded is provided with a glue injection groove 111, the glue injection groove 111 is arranged around a circle, and the glue injection groove 111 is filled with a first adhesive for bonding the anti-corrosion sound window 200 and the limiting part 110. In the process of assembling and bonding the anti-corrosion sound window 200 and the anti-corrosion shell 100 into one body, by filling the first adhesive in the glue injection groove 111, the glue injection groove 111 can guide the first adhesive, effectively reduce the phenomenon that the first adhesive overflows from the limiting part 110 and flows around, ensure that the first adhesive is solidified and formed in the glue injection groove 111 and between the limiting part 110 and the anti-corrosion sound window 200, and improve the bonding structure strength of the first adhesive, reduce the amount of the first adhesive, and reduce the production cost.

[0052] In specific applications, the material of the anti-corrosion shell 100 and the anti-corrosion sound window 200 can be selected as PVDF material, PTFE material or PPS material according to the requirements of the actual use environment. In the present embodiment, the anti-corrosion shell 100 and the anti-corrosion sound window 200 are both made of PVDF material; compared with the use of ultrasonic welding to connect the anti-corrosion sound window 200 and the limiting portion 110 made of PVDF material into one, the present embodiment uses a first adhesive to bond the anti-corrosion sound window 200 and the limiting portion 110 made of PVDF material into one, which is easier to assemble and more economical.

[0053] Specifically, the first adhesive uses polytetrafluoroethylene glue of model Yuefu 643. This type of polytetrafluoroethylene glue has a higher similarity in chemical composition with the anti-corrosion acoustic window 200 and the limiting portion 110 made of PVDF material. Polytetrafluoroethylene glue can better penetrate and adhere to the PVDF material to form a stronger bonding force; and this type of polytetrafluoroethylene glue can take into account both bonding strength and anti-corrosion performance after curing and molding, effectively reducing the risk of corrosion at the connection between the anti-corrosion acoustic window 200 and the limiting portion 110 by corrosive media.

[0054] like Figure 5As shown, specifically, the inner side wall of the glue injection groove 111 relatively close to the axis of the anti-corrosion shell 100 is set as an inclined surface 1111, and the inclined surface 1111 extends axially from the top end of the limiting portion 110 to the bottom end of the limiting portion 110, and the inclined surface 1111 is inclined away from the axis of the anti-corrosion shell 100. The guidance of the inclined surface 1111 is conducive to filling the first adhesive into the glue injection groove 111, and reducing the amount of the first adhesive on the basis of increasing the bonding area between the first adhesive and the anti-corrosion sound window 200. It can be understood that the top and bottom ends described here are based on Figure 4 Described as a perspective.

[0055] In order to further improve the bonding effect between the anti-corrosion acoustic window 200 and the limiting portion 110 , specifically, at least a portion of the projection of the glue injection groove 111 along the axial direction does not fall within the range of the anti-corrosion acoustic window 200 .

[0056] In some embodiments, the piezoelectric assembly 300 includes a piezoelectric unit 310 and a matching layer 320. The matching layer 320 is connected to the anti-corrosion acoustic window 200 through a second adhesive. The piezoelectric unit 310 is arranged on a side of the matching layer 320 that is relatively far away from the anti-corrosion acoustic window 200. The outer surface of the piezoelectric unit 310 and part of the outer surface of the matching layer 320 are provided with a copper coating 330. By covering the outer wall of the piezoelectric unit 310 and part of the outer wall of the matching layer 320 with the copper coating 330, the electromagnetic interference to the piezoelectric assembly 300 is reduced, the anti-interference ability of the piezoelectric assembly 300 is improved, and the measurement accuracy of the anti-corrosion ultrasonic level meter of this embodiment is improved. At the same time, compared with the use of ultrasonic welding to connect the anti-corrosion acoustic window 200 and the matching layer 320 made of PVDF material into one, the second adhesive is used in this embodiment to bond the anti-corrosion acoustic window 200 and the matching layer 320 made of PVDF material into one, which is more convenient for assembly operation and more economical.

[0057] Specifically, the second adhesive is selected as a polytetrafluoroethylene surface treatment agent. Because the matching layer 320 is made of polymer material and the anti-corrosion acoustic window 200 is made of PVDF material, the polytetrafluoroethylene surface treatment agent has good matching properties with both materials, so it is easy to bond the anti-corrosion acoustic window 200 and the matching layer 320 into one.

[0058] like Figure 6 As shown, specifically, an absorbing layer 340 is provided between the outer wall of the piezoelectric unit 310 and the copper cladding layer 330 ; the absorbing layer 340 can absorb stray waves and reduce resonance, which is beneficial to improving the performance and stability of the piezoelectric component 300 .

[0059] Specifically, an absorbing layer 340 is disposed between at least part of the matching layer 320 and the copper cladding layer 330 ; the absorbing layer 340 can absorb stray waves and reduce resonance, which is beneficial to improving the performance and stability of the piezoelectric component 300 .

[0060] Specifically, a copper clad layer 330 is provided at the top of the piezoelectric unit 310 relatively away from the matching layer 320, and an absorbing layer 340 is provided between the top of the piezoelectric unit 310 and the copper clad layer 330; by covering the top of the piezoelectric unit 310 with the copper clad layer 330, electromagnetic interference to the piezoelectric component 300 is reduced, and the absorbing layer 340 absorbs stray waves and reduces resonance, which is beneficial to improving the performance and stability of the piezoelectric component 300.

[0061] Specifically, a wire groove 341 is axially arranged in the absorbing layer 340 , and a lead hole 321 is arranged at a position of the matching layer 320 corresponding to the wire groove 341 , so that the wire can pass through for routing.

[0062] like Figures 1 to 4 As shown, in some embodiments, the end of the anti-corrosion housing 100 relatively far from the anti-corrosion sound window 200 is threadedly connected with a connector 400, and the end of the connector 400 relatively far from the anti-corrosion housing 100 is detachably connected with a meter head 500. The connector 400 is detachably connected to the anti-corrosion housing 100 by threaded connection, and the meter head 500 is detachably connected to the connector 400 as a whole. On the one hand, after the piezoelectric component 300 and the anti-corrosion sound window 200 are bonded into one body using the second adhesive and the anti-corrosion sound window 200 and the limiter 110 are bonded into one body using the first adhesive, it is convenient to firstly thread the connector 400 to the top end of the anti-corrosion housing 100 relatively away from the first end, and then connect the meter head 500 to the top end of the connector 400 relatively away from the anti-corrosion housing 100, so as to realize the assembly of the anti-corrosion ultrasonic level meter of this embodiment, and the whole assembly process has low difficulty and few operation steps, which is conducive to reducing the assembly cost of the anti-corrosion ultrasonic level meter of this embodiment. On the other hand, when the meter header 500 is damaged, it is easy to disassemble for repair or replacement.

[0063] Here, the detachable connection structure of the connector 400 and the meter head 500 is described in detail. Figures 1 to 3As shown, in some embodiments, a plurality of threaded holes 410 are arranged at intervals on the end face of the connecting piece 400 relatively close to the meter header 500, preferably four threaded holes 410 are arranged circumferentially around the axis of the connecting piece 400, and a through hole is formed at the position of the meter header 500 corresponding to the threaded hole 410 along the axial direction of the meter header 500, and the through hole is used for the rod of the connecting bolt 510 to pass through, and the connecting bolt 510 matches the threaded hole 410; when the connecting piece 400 and the meter header 500 are assembled into one, it is only necessary to select four connecting bolts 510 to pass through the through holes respectively and screw them into the corresponding internal threaded holes 410, so that the connection is tight and the assembly is convenient. In another alternative embodiment, the end surface of the gauge head 500 facing the connector 400 is provided with a plurality of threaded holes 410 at intervals along the circumferential direction, preferably four threaded holes 410, and the connector 400 is provided with a through hole axially extending through the position corresponding to the threaded hole 410, and the through hole is used for the rod of the connecting bolt 510 to pass through, and the connecting bolt 510 matches the threaded hole 410. It can be understood that the gauge head 500, the connector 400 and the anti-corrosion housing 100 are coaxially assembled, so the axial direction of the gauge head 500, the axial direction of the connector 400 and the axial direction of the anti-corrosion housing 100 are in the same direction.

[0064] Here, the threaded connection structure of the anti-corrosion housing 100 and the connecting member 400 is described in detail. Figure 4 As shown, in some embodiments, an inner wall of one end of the anti-corrosion shell 100 relatively close to the connecting piece 400 is provided with an internal threaded portion 120, and an outer wall of one end of the connecting piece 400 relatively close to the anti-corrosion shell 100 is provided with an external threaded portion, and the external threaded portion matches the internal threaded portion 120; when the anti-corrosion shell 100 and the connecting piece 400 are assembled into one, it is only necessary to align the internal threaded portion 120 and the external threaded portion, and then tighten the external threaded portion into the internal threaded portion 120, so that the connection is tight and the assembly is convenient.

[0065] In order to facilitate the tightening or loosening of the internal threaded portion 120 and the external threaded portion, specifically, a force-applying portion 130 is convexly provided on the outer wall of the upper end of the anti-corrosion shell 100, and the force-applying portion 130 is arranged in a hexagonal prism shape; such an arrangement can provide a clampable and anti-slip plane on the anti-corrosion shell 100, so as to clamp and fix the anti-corrosion shell 100 and drive the anti-corrosion shell 100 to rotate relative to the connecting piece 400, making assembly more convenient.

[0066] like Figure 2 and Figure 3 As shown, specifically, the outer wall of the connector 400 is provided with two clamping openings 420 spaced circumferentially, and the two clamping openings 420 spaced 180° circumferentially provide a position for clamping and preventing slipping for tools such as wrenches, so as to drive the connector 400 to rotate and tighten the internal threaded portion 120 and the external threaded portion to each other.

[0067] In another replaceable embodiment of the threaded connection structure of the anti-corrosion shell 100 and the connector 400, an inner wall of the connector 400 at one end relatively close to the anti-corrosion shell 100 is provided with an internal threaded portion 120, and an outer wall of the anti-corrosion shell 100 at one end relatively close to the connector 400 is provided with an external threaded portion, and the external threaded portion matches the internal threaded portion 120; when the anti-corrosion shell 100 and the connector 400 are assembled into one, it is only necessary to align the internal threaded portion 120 and the external threaded portion, and then tighten the external threaded portion into the internal threaded portion 120, so that the connection is tight and the assembly is convenient.

[0068] Specifically, a positioning portion 430 is convexly provided on the outer wall of the connecting piece 400, and the positioning portion 430 abuts against the top of the anti-corrosion housing 100, and a sealing ring 440 is provided between the top of the anti-corrosion housing 100 and the positioning portion 430. When the anti-corrosion housing 100 and the connecting piece 400 are assembled into one body, the sealing ring 440 abuts tightly against the anti-corrosion housing 100 and the positioning portion 430, respectively, which is conducive to improving the sealing connection performance between the anti-corrosion housing 100 and the positioning portion 430.

[0069] According to a second aspect of the embodiment of the present invention, there is also provided an assembly method for assembling the anti-corrosion ultrasonic level meter provided by the first aspect of the embodiment of the present invention; the assembly method comprises the following steps:

[0070] Bonding the piezoelectric component 300 and the anti-corrosion acoustic window 200 into one body;

[0071] Apply the first adhesive to the top of the limiting portion 110;

[0072] The piezoelectric component 300 and the anti-corrosion acoustic window 200 are placed together in the anti-corrosion shell 100, and the anti-corrosion acoustic window 200 is abutted against the top of the limiting portion 110, so that the first adhesive bonds the anti-corrosion acoustic window 200 and the limiting portion 110 into one body to obtain the anti-corrosion ultrasonic liquid level meter provided in the first aspect of the embodiment of the present invention.

[0073] The assembly method of this embodiment is to separately set the anti-corrosion shell 100, the anti-corrosion acoustic window 200 and the piezoelectric component 300. During the assembly process, the anti-corrosion shell 100 and the anti-corrosion acoustic window 200 can be first made of anti-corrosion materials respectively, and then the piezoelectric component 300 and the anti-corrosion acoustic window 200 are bonded together. Then, the assembly position of the anti-corrosion acoustic window 200 in the first end opening of the anti-corrosion shell 100 is positioned by using the limiting portion 110, and the anti-corrosion acoustic window 200 and the limiting portion 110 are bonded together with the first adhesive. The piezoelectric component 300 can be assembled in the anti-corrosion shell 100 to obtain the anti-corrosion ultrasonic liquid level meter provided by the first aspect of the embodiment of the present invention. The entire assembly process is simple to operate, and the assembled anti-corrosion ultrasonic liquid level meter has sufficient measurement range and accuracy on the basis of having anti-corrosion performance.

[0074] Specifically, before the piezoelectric component 300 and the anti-corrosion acoustic window 200 are placed together in the anti-corrosion housing 100, the first adhesive is also filled in the glue injection groove 111. The glue injection groove 111 provides a filling space for the first adhesive and can guide the first adhesive, effectively reducing the phenomenon that the first adhesive overflows from the limiting portion 110 and flows around, ensuring that the first adhesive is cured and formed in the glue injection groove 111 and between the limiting portion 110 and the anti-corrosion acoustic window 200, and improving the bonding structural strength of the first adhesive, reducing the amount of the first adhesive, and further reducing the assembly cost.

[0075] Specifically, the first adhesive is tetrafluoroethylene glue;

[0076] When the piezoelectric component and the anti-corrosion acoustic window are bonded together, a second adhesive is used to complete the bonding between the piezoelectric component and the anti-corrosion acoustic window, and the second adhesive is a polytetrafluoroethylene surface treatment agent.

[0077] The anti-corrosion acoustic window 200 and the limiting part 110 made of polytetrafluoroethylene glue and PVDF material have a higher similarity in chemical composition. Polytetrafluoroethylene glue can better penetrate and adhere to the PVDF material to form a stronger bonding force; and this type of polytetrafluoroethylene glue can take into account both bonding strength and anti-corrosion performance after curing and molding, and effectively reduce the risk of corrosion of the connection between the anti-corrosion acoustic window 200 and the limiting part 110 by corrosive media; at the same time, because the matching layer 320 is made of polymer material and the anti-corrosion acoustic window 200 is made of PVDF material, the polytetrafluoroethylene surface treatment agent has better matching with the materials of both, so it is convenient to bond the anti-corrosion acoustic window 200 and the matching layer 320 into one.

[0078] The specific assembly process of the anti-corrosion ultrasonic level meter provided in the first aspect of the embodiment of the present invention is as follows:

[0079] First, apply polytetrafluoroethylene surface treatment agent to the end face of the anti-corrosion acoustic window 200 relatively close to the piezoelectric component 300, and after a set time, bond the first end face of the anti-corrosion acoustic window 200 to the matching layer 320 of the piezoelectric component 300; then fill the injection groove 111 with polytetrafluoroethylene glue of model number Yuefu 643, and place the piezoelectric component 300 and the anti-corrosion acoustic window 200 into the anti-corrosion shell 100 from the opposite top end of the anti-corrosion shell 100, and connect the anti-corrosion acoustic window 200 with the top end of the limiter 110 relatively close to the anti-corrosion acoustic window Touch, after the set time, use polytetrafluoroethylene glue to bond the anti-corrosion sound window 200 to the limiting part 110; then align the external threaded part of the connecting piece 400 with the internal threaded part 120 of the anti-corrosion shell 100 and tighten them so that the connecting piece 400 is fixedly connected to the top of the anti-corrosion shell 100, and finally select four connecting bolts 510 to pass through the through holes respectively and screw them into the corresponding internal threaded holes 410, so that the meter head 500 is connected to the top of the connecting piece 400 to assemble the anti-corrosion ultrasonic level meter provided by the first aspect of the embodiment of the present invention.

[0080] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended invention.

Claims

1. An anti-corrosion ultrasonic level meter, characterized in that: include: The anti-corrosion shell (100) is arranged in a tubular shape and has a cavity, the first end of the anti-corrosion shell (100) is penetrated, and the inner wall of the anti-corrosion shell (100) close to the first end is provided with a stopper (110) protruding in a direction close to the axis of the anti-corrosion shell (100); An anti-corrosion acoustic window (200) is disposed in the anti-corrosion housing (100) and is bonded to the limiting portion (110); The piezoelectric component (300) is disposed in the anti-corrosion housing (100) and is fixedly connected to the anti-corrosion acoustic window (200).

2. The anti-corrosion ultrasonic level meter according to claim 1, characterized in that: The limiting portion (110) is arranged in a ring shape, and the end surface of the limiting portion (110) bonded to the anti-corrosion sound window (200) is provided with a glue injection groove (111), the glue injection groove (111) is arranged around a circle, and the glue injection groove (111) is filled with a first adhesive for bonding the anti-corrosion sound window (200) and the limiting portion (110).

3. The anti-corrosion ultrasonic level meter according to claim 2, characterized in that: The inner side wall of the glue injection groove (111) relatively close to the axis of the anti-corrosion shell (100) is arranged as an inclined surface (1111), and the inclined surface (1111) extends along the axial direction of the anti-corrosion shell (100) from the top end of the limiting part (110) to the bottom end of the limiting part (110), and the inclined surface (1111) is arranged to be inclined in a direction away from the axis of the anti-corrosion shell (100).

4. An anti-corrosion ultrasonic level meter according to any one of claims 1 to 3, characterized in that: The piezoelectric component (300) comprises a piezoelectric unit (310) and a matching layer (320); the matching layer (320) is connected to the anti-corrosion acoustic window (200) via a second adhesive; the piezoelectric unit (310) is arranged on a side of the matching layer (320) relatively far away from the anti-corrosion acoustic window (200); and a copper cladding layer (330) is provided on the outer surface of the piezoelectric unit (310) and on part of the outer surface of the matching layer (320).

5. The anti-corrosion ultrasonic level meter according to claim 4, characterized in that: A wave absorbing layer (340) is provided between at least a portion of the outer surface of the piezoelectric unit (310) and the copper cladding layer (330); And / or, an absorbing layer (340) is provided between at least part of the matching layer (320) and the copper clad layer (330).

6. An anti-corrosion ultrasonic level meter according to any one of claims 1 to 3, characterized in that: One end of the anti-corrosion housing (100) relatively far from the anti-corrosion sound window (200) is threadedly connected to a connector (400), and one end of the connector (400) relatively far from the anti-corrosion housing (100) is detachably connected to a meter head (500).

7. The anti-corrosion ultrasonic level meter according to claim 6, characterized in that: The connecting member (400) is provided with a plurality of threaded holes (410) arranged at intervals on the end surface relatively close to the gauge head (500), and the gauge head (500) is provided with a through hole formed along the axial direction of the gauge head (500) at a position corresponding to the threaded hole (410), and the through hole is used for the rod of the connecting bolt (510) to pass through, and the connecting bolt (510) matches the threaded hole (410).

8. An assembly method, used for assembling the anti-corrosion ultrasonic level meter according to any one of claims 1 to 7, characterized in that: The assembly method comprises the following steps: Bonding the piezoelectric component (300) and the anti-corrosion acoustic window (200) into one body; Applying a first adhesive to the top of the limiting portion (110); The piezoelectric component (300) and the anti-corrosion sound window (200) are placed together in an anti-corrosion shell (100), and the anti-corrosion sound window (200) is abutted against the top of the limiting portion (110), so that the first adhesive bonds the anti-corrosion sound window (200) and the limiting portion (110) into one.

9. An assembly method according to claim 8, characterized in that: Before placing the piezoelectric component (300) and the anti-corrosion acoustic window (200) together in the anti-corrosion housing (100), the method further includes filling the first adhesive into the glue injection groove (111).

10. An assembly method according to claim 8, characterized in that: The first adhesive is tetrafluoroethylene glue; When the piezoelectric component (300) and the anti-corrosion acoustic window (200) are bonded together, a second adhesive is used to complete the bonding between the piezoelectric component (300) and the anti-corrosion acoustic window (200), and the second adhesive is a polytetrafluoroethylene surface treatment agent.

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