Ultra-large diameter ultrasonic flow meter

Abstract

The present invention discloses an ultra-large-caliber ultrasonic flowmeter, wherein an outer tube is sleeved on the outer side of an inner tube and fixed relative to the inner tube, and a pair of corresponding discrete block groups are respectively located on both sides of an annular cavity; each discrete block group includes a plurality of discrete blocks, and the discrete blocks are formed with mounting holes, and transducers are fixedly mounted in the mounting holes, and the transducers in each pair of discrete block groups correspond to each other one by one. The discrete block group of the present invention includes a plurality of discrete blocks, and the number of transducers in the flowmeter can be changed by increasing or decreasing the number of discrete blocks, and there is no need to re-open the mold for the inner liner and the outer tube, which solves the problem of poor adaptability of the existing large-caliber ultrasonic flowmeter to increase or decrease the installation of paired transducers; the discrete block group is annular or arc-shaped, and the outer tube and the inner tube can use a universal round tube, and there is no need to process and set the transducer installation shell on the outer tube, and the processing is simple; the inner liner or the discrete block group can be directly fixed by the inner tube, the outer tube and the connecting part, which solves the problem of cumbersome installation of the inner liner and the outer tube.

Description

Technical Field

[0001] This application relates to an ultra-large caliber ultrasonic flowmeter Background Art

[0002] For ultrasonic flowmeters with large diameters (DN300 and above), especially ultra-large diameters (such as DN1200), the transducer can only be installed and fixed by welding the transducer seat to the flowmeter tube body. The number of transducer welding mounts that can be set is also extremely limited, and the welding process is cumbersome (easy to deform and lose the accuracy of paired straight line pairing). If a smaller-diameter ultrasonic flowmeter is used with an overall segmented lining and the transducer is installed on the lining, then when the diameter is larger, the difficulty of injection molding the lining increases, the cost is very high, or the performance cannot be effectively achieved at all (the injection molded lining is required to have a very high precision size). At the same time, if the number of transducers of the ultrasonic flowmeter needs to be adjusted according to different application scenarios (flow measurement or precision metering), the lining needs to be re-molded, resulting in a waste of time and cost. Moreover, the existing installation and fixation steps of the lining and the outer pipe are relatively cumbersome, which also affects production efficiency. Summary of the invention

[0003] In view of the above problems, the present application proposes an ultra-large diameter ultrasonic flowmeter, which solves the problem of poor application adaptability caused by the welding mode required for the transducer seat of the existing large-diameter ultrasonic flowmeter and the inability to arrange more transducers or flexibly adjust them. At the same time, it also solves the problem of simplified installation and fixing steps of the liner and the inner and outer pipes, and the one-time welding of the inner and outer pipes and the flange into a whole, thereby greatly reducing the high production cost of the previous transducer installation mode.

[0004] An ultra-large-caliber ultrasonic flowmeter comprises: an outer tube, an inner tube and a plurality of pairs of discrete block groups, wherein the outer tube is sleeved on the outer side of the inner tube and fixed relative to the inner tube, an annular cavity is formed between the outer tube and the inner tube, and a corresponding pair of discrete block groups are respectively located on both sides of the annular cavity; each discrete block group comprises a plurality of discrete blocks, the discrete blocks are formed with mounting holes, the transducers are fixedly mounted in the mounting holes, and the transducers in each pair of discrete block groups correspond to each other one by one.

[0005] Preferably, the discrete block group is annular or arc-shaped, and the positions of two adjacent discrete blocks in the same discrete block group are fixed.

[0006] Preferably, the separate block is arc-shaped, and is formed with a fixing column; the inner tube is formed with a plurality of first inner tube fixing holes, and the fixing columns of the separate block are inserted into the first inner tube fixing holes.

[0007] Preferably, the inner tube is formed with a transducer hole, and the transducer passes through the mounting hole and the transducer hole in sequence.

[0008] Preferably, a first fixing plate is formed on one side of the discrete block, and a second fixing plate is formed on the other side; the first fixing plate is formed with a fixing column, and the second fixing plate is formed with a fixing hole, and the fixing columns of two adjacent discrete blocks pass through the fixing hole.

[0009] Preferably, a circuit assembly is disposed in the middle of the annular cavity, and the circuit assembly includes a base, an integrator circuit board and a cover, the integrator circuit board is fixedly installed inside the base, the cover is above the base and fixedly connected to the base, and a first through hole is opened above the cover;

[0010] The base is formed with a wire inlet groove, and a wire inlet protrusion is formed under the cover. The wire inlet protrusion is inserted into the wire inlet groove, and the lead wire of the transducer passes through the gap between the wire inlet groove and the wire inlet protrusion into the base and is electrically connected to the integrator circuit board;

[0011] A base fixing column is formed below the base, a second inner tube fixing hole is formed in the inner tube, and the base fixing column is inserted into the base fixing column.

[0012] Preferably, it also includes a meter head, the outer tube is provided with an outer tube hole, the connecting tube of the meter head is above the outer tube hole and fixedly connected to the outer tube, the lower part of the connecting tube is fixedly connected to a rubber baffle plate, the rubber baffle plate is formed with a second through hole, the upper part of the connecting tube is fixedly connected to a pressure-resistant externally threaded steel ring, the pressure-resistant externally threaded steel ring is formed with a third through hole; the output line of the integrator circuit board passes through the first through hole, the second through hole and the third through hole in sequence to be connected to the meter head; sealant is poured between the base and the cover, and sealant is poured between the rubber baffle plate and the pressure-resistant externally threaded steel ring.

[0013] Preferably, it further comprises a connecting part, and connecting parts are respectively provided at both ends of the outer tube, the outer tube is fixedly connected to the connecting part, and the inner tube is fixedly connected to the connecting part.

[0014] Preferably, a fixing ring is provided between a pair of discrete block groups and / or between the discrete block group and the connecting part, the fixing ring fixes the discrete block group circumferentially relative to the outer tube, the discrete block group or the fixing ring is fixedly connected to the connecting part, and the discrete block group and the fixing ring are fixedly connected.

[0015] Preferably, the fixed ring between a pair of discrete block groups includes a fixed block, a circuit block for installing an integrator circuit board, and a wire slot block. The middle part of the fixed ring is a first ring body composed of the circuit block and the wire slot block, and the two sides are second ring bodies composed of the fixed blocks. The first ring body is fixedly connected to the second ring body.

[0016] The present invention has the following advantages: the discrete block group includes a plurality of discrete blocks, and the number of transducers in the flow meter can be changed by increasing or decreasing the number of discrete blocks, so that the large-caliber flow meter can be installed with any number of transducers according to the applicable scene and demand, and there is no need to re-open the mold of the inner liner and the outer tube, which solves the problem of poor adaptability caused by the inability to adjust the number of transducers in the existing large-caliber ultrasonic flow meter; the transducer, the transducer connection and the built-in integral circuit (only the chip, etc. without the display screen) are strictly anti-foaming treated (the circuit board is first plated with Parylene, and then sealed with 12mm thick strong A and B waterproof glue, and only outputs one The discrete block group (a power supply + data four-core line) is annular or arc-shaped, so that the outer tube and the inner tube can use round tubes, and there is no need to process a shell that can accommodate the transducer mounting seat on the outer tube, which is simple to process and saves costs; there is no need to perform waterproof sealing treatment between the inner tube and the outer tube, and the liner or discrete block group can be directly fixed by the inner tube, the outer tube and the connecting part, which solves the problem of cumbersome installation and fixing steps of the inner liner and the outer tube. The tooling fixes the inner and outer tubes and the flange, and they are quickly welded into one by laser, which is very simple and safe, saving production time and reducing production costs (the laser welding speed is about 2.5 meters / minute, the weld is very narrow, it is cold welding, not easy to deform, and does not require solid solution treatment of the weldment). BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 : A schematic diagram of the main structure of the first embodiment of the present invention;

[0019] Figure 2 : A schematic diagram of the side view structure of the first embodiment of the present invention;

[0020] Figure 3 : A schematic cross-sectional view of the structure of the first embodiment of the present invention taken at point A;

[0021] Figure 4 : A schematic cross-sectional view of the structure of the first embodiment of the present invention taken at position B;

[0022] Figure 5 : A schematic cross-sectional view of the structure of the first embodiment of the present invention taken at position C;

[0023] Figure 6 : A schematic diagram of a local enlarged structure at D of the first embodiment of the present invention;

[0024] Figure 7 : A schematic diagram of a local enlarged structure at position E of the first embodiment of the present invention;

[0025] Figure 8 : A schematic diagram of a local enlarged structure at F of the first embodiment of the present invention;

[0026] Fig. 9 : A schematic diagram of the three-dimensional structure of the discrete blocks of the first embodiment of the present invention (top view);

[0027] Fig.10 : A schematic diagram of the three-dimensional structure of the discrete blocks of the first embodiment of the present invention (looking from above);

[0028] Fig.11 : A schematic diagram of the three-dimensional structure of the discrete block group and the circuit assembly of the first embodiment of the present invention;

[0029] Fig.12 : A schematic cross-sectional view of the second embodiment of the present invention;

[0030] Fig.13 : Schematic diagram of the three-dimensional structure of the ring body lining according to the second embodiment of the present invention;

[0031] Fig.14 : A schematic diagram of the three-dimensional structure at G of the second embodiment of the present invention;

[0032] Fig.15 : A three-dimensional structural diagram of a discrete block group and a circuit assembly according to a second embodiment of the present invention;

[0033] Fig.16 : A schematic cross-sectional view of the transducer of the present invention;

[0034] Fig.17 : A schematic diagram of the three-dimensional structure of the transducer of the present invention;

[0035] Fig.18 : A schematic diagram of the three-dimensional structure of the transducer pressing block of the present invention;

[0036] Fig.19 : Schematic diagram of the explosion structure of the transducer of the present invention;

[0037] Fig. 20 : A schematic cross-sectional view of the transducer housing of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Embodiment 1:

[0040] like Figures 1 to 11 and Figures 16 to 20 As shown, this embodiment provides an ultra-large caliber ultrasonic flowmeter, including: an outer tube 1, an inner tube 2 and a plurality of pairs of discrete block groups, wherein the outer tube 1 is sleeved on the outer side of the inner tube 2 and fixed relative to the inner tube 2, an annular cavity is formed between the outer tube 1 and the inner tube 2, and a corresponding pair of discrete block groups are respectively located on both sides of the annular cavity; each discrete block group includes a plurality of discrete blocks 4, wherein the discrete blocks 4 are formed with mounting holes 41, wherein the transducers 8 are fixedly mounted in the mounting holes 41, and the transducers 8 in each pair of discrete block groups correspond to each other. The number of discrete blocks 4 contained in each corresponding pair of discrete block groups is the same.

[0041] Preferably, the discrete block group is annular or arc-shaped, and the positions of two adjacent discrete blocks 4 in the same discrete block group are fixed.

[0042] Preferably, the separate block 4 is arc-shaped, and the separate block 4 is formed with a fixing column 45 ; the inner tube 2 is formed with a plurality of first inner tube fixing holes 22 , and the fixing columns 45 of the separate block 4 are inserted into the first inner tube fixing holes 22 .

[0043] Preferably, the inner tube 2 is formed with a transducer hole 21 , and the transducer 8 passes through the mounting hole 41 and the transducer hole 21 in sequence.

[0044] Preferably, a wire outlet groove 42 is formed on the inner tube 2 , the wire outlet groove 42 is communicated with the mounting hole 41 , and the lead wire of the transducer 8 is arranged in the wire outlet groove 42 .

[0045] Preferably, a circuit assembly 5 is disposed in the middle of the annular cavity, and the circuit assembly 5 includes a base 51, an integrator circuit board 52 and a cover 53. The integrator circuit board 52 is fixedly installed inside the base 51, and the cover 53 is above the base 51 and fixedly connected to the base 51. A first through hole is opened above the cover 53;

[0046] The base 51 is formed with a wire inlet groove 511, and a wire inlet protrusion 521 is formed below the cover 53. The wire inlet protrusion 521 is inserted into the wire inlet groove 511, and the lead wire of the transducer 8 passes through the gap between the wire inlet groove 511 and the wire inlet protrusion 521 into the base 51 and is electrically connected to the integrator circuit board 52;

[0047] A plurality of base fixing columns 512 are formed below the base 51 , and a second inner tube fixing hole 23 is formed on the inner tube 2 , into which the base fixing columns 512 are inserted.

[0048] Preferably, it also includes a meter head 6, the outer tube 1 is provided with an outer tube hole 11, the connecting tube of the meter head 6 is above the outer tube hole 11 and fixedly connected to the outer tube 1, the lower part of the connecting tube is fixedly connected to the rubber baffle 71, the rubber baffle 71 is formed with a second through hole, the upper part of the connecting tube is fixedly connected to the pressure-resistant externally threaded steel ring 72, the pressure-resistant externally threaded steel ring 72 is formed with a third through hole; the output line of the integrator circuit board 52 passes through the first through hole, the second through hole and the third through hole in sequence to be connected to the electronic components (such as a display) in the meter head 6; sealant is poured between the base 51 and the cover 53, sealant is poured between the rubber baffle 71 and the pressure-resistant externally threaded steel ring 72, and the pressure-resistant externally threaded steel ring 72 plays a pressure-bearing role.

[0049] Preferably, it further comprises a connection part 3, and the connection parts 3 are respectively provided at both ends of the outer tube 1, the outer tube 1 is fixedly connected to the connection part 3, and the inner tube 2 is fixedly connected to the connection part 3. Preferably, the connection part 3 is a flange, and the connection part 3 is formed with a first mounting groove 31 and a second mounting groove 32, the outer tube 1 is inserted into the first mounting groove 31 and fixed to the connection part 3 by laser welding, and the inner tube 2 is inserted into the second mounting groove 32 and fixed to the connection part 3 by laser welding.

[0050] The structure of the transducer 8 is as follows:

[0051] The mounting hole 41 is a through hole. The transducer 8 includes a transducer ceramic sheet 82 and a transducer circuit board 83, wherein the transducer ceramic sheet 82 is electrically connected to the transducer circuit board 83. The transducer 8 also includes a transducer housing 84, wherein a housing blind hole 84c is formed inside the transducer housing 84, and a blind hole limiting protrusion 84b is formed on the bottom surface of the housing blind hole 84c. After the bottom surface of the housing blind hole 84c is injected with glue, the transducer ceramic sheet 82 is pushed into the housing blind hole 84c until the transducer ceramic sheet 82 contacts the blind hole limiting protrusion 84b. At this time, only colloid exists between the transducer ceramic sheet 82 and the bottom surface of the housing blind hole 84c. After the colloid is dried, a transducer front glue layer 81 is formed, and the transducer front glue layer 81 adheres and fixes the transducer ceramic sheet 82 and the bottom surface of the housing blind hole 84c. The thickness of the transducer front glue layer 81 is the same as the height of the blind hole limiting protrusion 84b. The transducer circuit board 83 is fixedly installed in the blind hole 84c of the housing. After the lead wire of the transducer circuit board 83 passes through the blind hole 84c of the housing, glue is sealed on the outside of the transducer circuit board 83. After the glue dries, a transducer rear sealant 87 is formed. The transducer rear sealant 87 separates the blind hole 84c of the housing from the outside, and the lead wire of the transducer circuit board 83 passes through the transducer rear sealant 87. Preferably, before the outer side of the transducer circuit board 83 is sealed with glue, the lead wire passes through the blind hole 84c of the housing and then passes through the first outlet hole 851 of the transducer cover 85, and then the glue is sealed. Before the glue is not dried, the transducer cover 85 is inserted into the transducer housing 84, and the transducer cover 85 is bonded and fixed to the transducer housing 84 through the transducer rear sealant 87. The lead wire of the transducer circuit board 83 and the output wire of the integrator circuit board 52 are waterproof wires.

[0052] The mounting hole 41 is formed with a step, and the transducer housing 84 is formed with an enlarged portion 84a. The transducer housing 84 is inserted into the mounting hole 41, and the enlarged portion 84a contacts the step, and the step limits the movement of the enlarged portion 84a into the discrete block 4. The transducer clamping block 86 is between the transducer housing 84 and the outer tube 1 and clamps and fixes the transducer housing 84. The transducer clamping block 86 is adapted to the inner wall of the outer tube 1. After the discrete block 4 enters the outer tube 1, the transducer clamping block 86 is fixed relative to the outer tube 1. Preferably, a positioning protrusion 863 is formed below the transducer clamping block 86, and the transducer housing 84 and / or the transducer cover 85 are formed with a positioning step 841. The positioning protrusion 863 is inserted into the positioning step 841 to limit the rotation of the transducer housing 84 relative to the transducer clamping block 86. The top surface of the transducer clamping block 86 is in contact with the outer tube 1, thereby limiting the transducer clamping block 86 from rotating relative to the outer tube 1. The transducer clamping block 86 is formed with a second through hole 861 and a wiring groove 862 (if necessary, the transducer cover 85 may also be formed with a groove for the lead wire to pass through, which is adapted to the wiring groove 862). The lead wire of the transducer circuit board 83 passes through the first through hole 851, the second through hole 861 and the wiring groove 862 in sequence and then enters the wire outlet groove 42. After passing through the wire outlet groove 42, it passes through the annular cavity and the wire inlet groove 511 in sequence to enter the interior of the base 51 and is electrically connected to the integrator circuit board 52. The output wire of the integrator circuit board 52 is passed upward in sequence through the first through hole of the cover (53), and then a sealant is poured above the integrator circuit board 52 and the cover 53 is installed on the integrator circuit board 52. At this time, the inlet protrusion 521 is inserted into the inlet groove 511 and contacts the lead-out wire, and the sealant fills and seals the gap between the lead-out wire and the inlet protrusion 521 and the inlet groove 511, thereby sealing the space between the base 51 and the cover 53. The inlet protrusion 521 inserted into the inlet groove 511 not only plays a sealing role, but also plays a positioning role between the cover 53 and the base 51. The sealant seals the first through hole.

[0053] Preferably, a sealing ring is provided between the bulge 84a and the step for waterproofing. The integrated transducer 8 can be pre-assembled, and the transducer 8 can be directly inserted when assembling the flow meter. The transducer 8 can be limited by the outer tube 1 and the step both being in contact with the transducer 8.

[0054] The above is only an optional form of fixing the transducer 8 relative to the outer tube 1 and the discrete block 4. The transducer housing 84 can also be formed with a protrusion, and the mounting hole 41 is formed with a groove adapted thereto, thereby limiting the rotation of the transducer housing 84 relative to the mounting hole 41 and limiting the movement of the transducer housing 84 toward the inside of the discrete block 4. If the enlarged portion 84a is made into a non-rotating body (such as the cross section of the enlarged portion 84a is changed from circular to rectangular), the above description can be met. The transducer cover 85 can directly contact the inner wall of the outer tube 1 to limit the movement of the transducer housing 84 toward the outer tube 1.

[0055] If the mounting hole 41 is a blind hole, the above-mentioned integrated packaged transducer can also be installed, in which case the bottom surface of the transducer housing 84 contacts or is bonded to the bottom surface of the transducer mounting hole 221 by adhesive, and the transducer housing 84 is fixed relative to the transducer mounting hole 221. If the mounting hole 41 is a blind hole, a conventional packaged transducer can also be used.

[0056] Working principle:

[0057] Discrete block 4 fixed form 1:

[0058] like Figures 8 to 10 As shown, the discrete block 4 is arc-shaped, and a first fixing plate 43 is formed on the upper side of one side of the discrete block 4, and a second fixing plate 44 is formed on the lower side of the other side (the upper and lower sides of this section are shown in FIG. Figure 8 The first fixing plate 43 is formed with a fixing column 45, and the second fixing plate 44 is formed with a fixing hole 46, and the fixing columns 45 of two adjacent discrete blocks 4 of the same discrete block group pass through the fixing hole 46. Preferably, the first fixing plate 43 and the second fixing plate 44 of two adjacent discrete blocks 4 are in contact.

[0059] Preferably, the inner tube 2 is formed with a first inner tube fixing hole 22 , and the fixing column 45 is inserted into the first inner tube fixing hole 22 .

[0060] During assembly, the fixing column 45 of the first discrete block 4 is inserted into the first inner tube fixing hole 22, and the outer diameter of the fixing column 45 is the same as the inner diameter of the fixing hole 22. The fixing column 45 of the second discrete block 4 is simultaneously inserted into the fixing hole 46 of the first discrete block 4 and the corresponding fixing hole 22, and then the fixing column 45 of the third discrete block 4 is simultaneously inserted into the fixing hole 46 of the second discrete block 4 and the corresponding fixing hole 22... and so on, the fixing column 45 of the last discrete block 4 is simultaneously inserted into the fixing hole 46 of the second-to-last discrete block 4 and the corresponding fixing hole 22, and the installation of an arc structure of a discrete block group is completed.

[0061] The discrete blocks 4 in an arc-shaped structure are limited in axial and circumferential movement relative to the inner tube 2 by inserting the fixing columns 45 into the fixing holes 22; the discrete blocks 4 are limited in rotation about the fixing columns 45 as the axis by inserting the fixing columns 45 into the fixing holes 46 of adjacent discrete blocks 4; thereby limiting the relative positions of the discrete blocks 4 and the positions of the discrete blocks 4 relative to the inner tube 2, thereby achieving the fixation of the position of the transducer 8 and the inner tube 2, ensuring that the corresponding transducers 8 of different discrete block groups are located on the same straight line.

[0062] A discrete block group may include a plurality of arc-shaped structures composed of discrete blocks 4, such as Figure 8 As shown, Figure 8One of the discrete block groups includes two arc-shaped structures composed of discrete blocks 4, and the two arc-shaped structures are located on the same ring.

[0063] Discrete block 4 fixed form 2:

[0064] The discrete block 4 is arc-shaped, with a first fixing plate 43 formed on one side of the discrete block 4 and a second fixing plate 44 formed on the other side. The first fixing plate 43 is formed with a first fixing hole, and the second fixing plate 44 is formed with a fixing hole 46. The first fixing holes of two adjacent discrete blocks 4 of the same discrete block group overlap with the fixing holes 46. Preferably, the first fixing plates 43 and the second fixing plates 44 of two adjacent discrete blocks 4 are in contact.

[0065] Preferably, the inner tube 2 is formed with a first inner tube fixing hole 22 , and a fixing pin or a screw passes through the first fixing hole and the fixing hole 46 and is inserted into the first inner tube fixing hole 22 .

[0066] Discrete block 4 fixed form three:

[0067] The discrete block 4 is arc-shaped, and a fixing column 45 is formed below the discrete block 4, and the fixing column 45 is inserted into the first inner tube fixing hole 22. The fixing column 45 is a column with a non-circular cross-section, and the first inner tube fixing hole 22 is a non-circular hole. The fixing column 45 has the same cross-sectional size and area as the first inner tube fixing hole 22. The fixing column 45 is inserted into the first inner tube fixing hole 22 to limit the axial movement and circumferential movement of the discrete block 4 relative to the inner tube 2, and at the same time limit the rotation of the discrete block 4 with the fixing column 45 as the axis. Adjacent discrete blocks 4 in a discrete block group do not need to be in contact, and the positions between the discrete blocks 4 can also be ensured to be fixed. A discrete block group can be annular or in a plurality of arcs.

[0068] Discrete block 4 fixed form four:

[0069] The discrete blocks 4 are arc-shaped, and a plurality of fixing columns 45 are formed under each discrete block 4, and the fixing columns 45 are respectively inserted into the corresponding first inner tube fixing holes 22. The fixing columns 45 inserted into the first inner tube fixing holes 22 limit the axial movement and circumferential movement of the discrete blocks 4 relative to the inner tube 2, and at the same time limit the rotation of the discrete blocks 4 around the fixing columns 45. Adjacent discrete blocks 4 in a discrete block group do not need to contact, and the positions of the discrete blocks 4 can also be fixed. A discrete block group can be annular or in a plurality of arcs.

[0070] The above-mentioned various fixing forms of the discrete blocks 4 can be used to install the required number of discrete blocks 8 according to the needs, so as to achieve the installation of the required number of transducers 8 in the flow meter.

[0071] The discrete block 4 and the circuit assembly 5 are both waterproof structures, so the outer diameter of the portion of the transducer housing 84 inserted into the transducer hole 21 as a through hole is smaller than the inner diameter of the transducer hole 21. That is, no waterproof treatment is required between the outer tube 1 and the inner tube 2, which reduces the cost of waterproof treatment of the outer tube 1 and the inner tube 2 as a whole, and does not require waterproof treatment for the first inner tube fixing hole 22. In addition, the outer tube 1 and the inner tube 2 are both round tubes, which have fast production and processing speed and low cost.

[0072] Multiple pairs of discrete blocks can be installed in the outer tube 1 and the inner tube 2, such as Fig.11 As shown, it can be Fig.11 Another pair of discrete block groups is added inside the existing matched pair of discrete block groups, and the distance between the transducers 8 corresponding to the newly added pair of discrete block groups is smaller than the distance between the transducers 8 corresponding to the original pair of discrete block groups.

[0073] Embodiment 2:

[0074] like Figures 12 to 20 As shown, this embodiment provides an ultra-large caliber ultrasonic flowmeter, including: an outer tube 1, an inner tube 2, and a plurality of pairs of discrete block groups, wherein the outer tube 1 is sleeved on the outer side of the inner tube 2 and fixed relative to the inner tube 2, an annular cavity is formed between the outer tube 1 and the inner tube 2, and a corresponding pair of discrete block groups are respectively located on both sides of the annular cavity; each discrete block group includes a plurality of discrete blocks 4, wherein the discrete blocks 4 are fixed relative to the inner tube 2, and the discrete blocks 4 are formed with mounting holes 41, wherein the transducers 8 are fixedly mounted in the mounting holes 41, and the transducers 8 in each pair of discrete block groups correspond to each other, and the corresponding pair of transducers 8 are on the same axis. The number of discrete blocks 4 contained in each corresponding pair of discrete block groups is the same.

[0075] Preferably, the discrete block group is annular or arc-shaped, and the positions of two adjacent discrete blocks 4 in the same discrete block group are fixed.

[0076] Preferably, it further comprises a connection part 3, and the connection parts 3 are respectively provided at both ends of the outer tube 1, the outer tube 1 is fixedly connected to the connection part 3, and the inner tube 2 is fixedly connected to the connection part 3. Preferably, the connection part 3 is a flange, and the connection part 3 is formed with a first mounting groove 31 and a second mounting groove 32, the outer tube 1 is inserted into the first mounting groove 31 and fixed to the connection part 3 by laser welding, and the inner tube 2 is inserted into the second mounting groove 32 and fixed to the connection part 3 by laser welding.

[0077] Preferably, a fixing ring is provided between a pair of discrete block groups and / or between the discrete block group and the connecting portion 3, the fixing ring fixes the discrete block group circumferentially relative to the outer tube 1, the discrete block group or the fixing ring is fixedly connected to the connecting portion 3, and the discrete block group and the fixing ring are fixedly connected.

[0078] Preferably, the fixed ring between a pair of discrete block groups includes a fixed block 91, a circuit block 92 for installing an integrator circuit board, and a wire slot block 93. The middle part of the fixed ring is a first ring body composed of the circuit block 92 and the wire slot block 93, and the two sides are second ring bodies composed of the fixed blocks 91. The first ring body is fixedly connected to the second ring body.

[0079] The discrete block 4, the fixed block 91, the circuit block 92 and the wire slot block 93 are all blocks of the same size and curvature, and each of the above blocks is formed with a protrusion and a groove. All adjacent blocks between the outer tube 1 and the inner tube 1 are fixed in position by inserting the protrusions into the grooves. All blocks form an integral ring body lining, and the two ends of the integral ring body lining are respectively in contact with the inner side of the connecting part 3, and the axial movement relative to the outer tube 1 is limited by the connecting parts 3 at both ends. Then a connecting block groove or a connecting block protrusion is formed on the inner side of the connecting block 3, and the connecting block groove or the connecting block protrusion is connected to the protrusion or groove of the block in contact with the connecting block 3, thereby limiting the axial rotation of the ring body lining relative to the outer tube 1 ( Fig.12 and Fig.15 In this way, the position of the ring body liner relative to the outer tube 1, the inner tube 2 and the connecting portion 3 is fixed, so that the position of the transducers 8 is relatively fixed, and there is no need to make holes in the inner tube 2 for fixing the discrete blocks.

[0080] The fixed block 91 is formed with an axial wire groove, and the wire groove block 93 is formed with a circumferential wire groove. When a wire groove block 93 is adjacent to two other wire groove blocks 93, the circumferential wire groove of this wire groove block 93 is not connected with the circumferential wire groove of at least one adjacent wire groove block 93 (i.e., an interrupted gap is formed); the lead wire of the transducer 8 passes through the outlet groove of the discrete block 4 and then passes through the axial wire grooves of several fixed blocks 91, turns from the interrupted gap between the circumferential wire grooves to enter the circumferential wire groove, and enters the circuit block 92 along the circumferential wire groove, and is electrically connected to the integrated circuit board of the circuit block 92. The integrated circuit board of the circuit block 92 is provided with a waterproof structure or measure.

[0081] The structure and principle of the transducer 8 of this embodiment are the same as those of the first embodiment, and the lead wires and other wires are waterproof wires.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. Ultra-large caliber ultrasonic flowmeter, characterized in that: include: An outer tube (1), an inner tube (2) and a plurality of pairs of discrete block groups, wherein the outer tube (1) is sleeved on the outer side of the inner tube (2) and fixed relative to the inner tube (2), an annular cavity is formed between the outer tube (1) and the inner tube (2), and a corresponding pair of discrete block groups are respectively located on both sides of the annular cavity; each discrete block group comprises a plurality of discrete blocks (4), the discrete blocks (4) are formed with mounting holes (41), and the transducers (8) are fixedly mounted in the mounting holes (41), and the transducers (8) in each pair of discrete block groups correspond to each other one by one; The discrete block group is annular or arc-shaped, and the positions of two adjacent discrete blocks (4) in the same discrete block group are fixed; It also comprises a connecting portion (3), wherein the connecting portions (3) are respectively provided at both ends of the outer tube (1), the outer tube (1) is fixedly connected to the connecting portion (3), and the inner tube (2) is fixedly connected to the connecting portion (3); A fixing ring is provided between a pair of discrete block groups and / or between the discrete block group and the connecting portion (3), the fixing ring fixes the discrete block group circumferentially relative to the outer tube (1), the discrete block group or the fixing ring is fixedly connected to the connecting portion (3), and the discrete block group and the fixing ring are fixedly connected.

2. The ultra-large-caliber ultrasonic flowmeter according to claim 1, characterized in that: The separate block (4) is arc-shaped, and is formed with a fixing column (45); the inner tube (2) is formed with a plurality of first inner tube fixing holes (22), and the fixing columns (45) of the separate block (4) are inserted into the first inner tube fixing holes (22).

3. The ultra-large-caliber ultrasonic flowmeter according to claim 1, characterized in that: The inner tube (2) is formed with a transducer hole (21), and the transducer (8) passes through the mounting hole (41) and the transducer hole (21) in sequence.

4. The ultra-large-caliber ultrasonic flowmeter according to claim 2, characterized in that: The discrete block (4) is formed with a first fixing plate (43) on one side and with a second fixing plate (44) on the other side; the first fixing plate (43) is formed with a fixing column (45), the second fixing plate (44) is formed with a fixing hole (46), and the fixing columns (45) of two adjacent discrete blocks (4) pass through the fixing hole (46).

5. The ultra-large-caliber ultrasonic flowmeter according to claim 4, characterized in that: A circuit assembly (5) is disposed in the middle of the annular cavity, the circuit assembly (5) comprising a base (51), an integrator circuit board (52) and a cover (53), the integrator circuit board (52) being fixedly mounted inside the base (51), the cover (53) being above the base (51) and fixedly connected to the base (51), and a first through hole being formed above the cover (53); The base (51) is formed with a wire inlet groove (511), and a wire inlet protrusion (521) is formed below the cover (53); the wire inlet protrusion (521) is inserted into the wire inlet groove (511), and the lead wire of the transducer (8) passes through the gap between the wire inlet groove (511) and the wire inlet protrusion (521) into the base (51) and is electrically connected to the integrator circuit board (52); A base fixing column (512) is formed below the base (51), a second inner tube fixing hole (23) is formed in the inner tube (2), and the base fixing column (512) is inserted into the base fixing column (512).

6. The ultra-large-caliber ultrasonic flowmeter according to claim 5, characterized in that: It also comprises a meter head (6), the outer tube (1) is provided with an outer tube hole (11), the connecting tube of the meter head (6) is located above the outer tube hole (11) and is fixedly connected to the outer tube (1), the lower part of the inner part of the connecting tube is fixedly connected to a rubber baffle (71), the rubber baffle (71) is formed with a second through hole, the upper part of the inner part of the connecting tube is fixedly connected to a pressure-resistant externally threaded steel ring (72), the pressure-resistant externally threaded steel ring (72) is formed with a third through hole; the output line of the integrating circuit board (52) passes through the first through hole, the second through hole and the third through hole in sequence and is connected to the meter head (6); a sealant is poured between the base (51) and the cover (53), and a sealant is poured between the rubber baffle (71) and the pressure-resistant externally threaded steel ring (72).

7. The ultra-large-caliber ultrasonic flowmeter according to claim 1, characterized in that: A fixed ring between a pair of discrete block groups comprises a fixed block (91), a circuit block (92) for mounting an integrator circuit board, and a wire slot block (93); the middle of the fixed ring is a first ring body composed of the circuit block (92) and the wire slot block (93); and both sides are second ring bodies composed of the fixed blocks (91); the first ring body is fixedly connected to the second ring body.

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