Ultrasonic flowmeter

Abstract

The utility model discloses an ultrasonic flow meter, which relates to the technical field of ultrasonic flow meter metering and comprises an inlet fixing part, an outlet fixing part, a first through hole and a second through hole, one end of the first through hole is connected with a pipeline; the flowmeter body comprises a shell and a metering module arranged in the shell; the inlet end of the metering module is directly connected with the other end of the first through hole in a sealed mode or indirectly connected with the other end of the first through hole through the shell in a sealed mode, a square metering area is formed in the metering module, a rectifying component is formed at the outlet end of the metering module, and a partial pressure area is formed in the area between a metering module shell and the shell; the outlet fixing piece is fixed with the shell and is provided with a second through hole; one end of the second through hole directly faces the outlet end of the metering module and is spaced from the outlet end of the metering module, and the other end of the second through hole is used for being connected with a pipeline; and the square metering area is communicated with the partial pressure area through the outlet end of the metering module and the interval. The ultrasonic flowmeter can improve the flow field and improve the measurement precision.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic flowmeter measurement, and more specifically, to an ultrasonic flowmeter. Background Art

[0002] An ultrasonic flowmeter is an instrument that uses ultrasonic signals to measure the flow velocity of a fluid and is currently widely used in the fields of medium and low-pressure natural gas metering or water supply metering.

[0003] Specifically, an ultrasonic flowmeter realizes the transmission and reception of ultrasonic signals through ultrasonic transducers, calculates the velocity of the fluid through the upstream and downstream propagation time difference, and finally determines the flow rate of the fluid through corresponding calculations.

[0004] There are mainly three types of existing industrial large-diameter pipeline flowmeters:

[0005] Chinese Patent No. CN113970365A discloses a large-diameter large-flow measurement system and method. The measurement system adds a bypass branch parallel to the axis of the main pipeline, measures the flow rate of the branch pipeline using an ultrasonic flowmeter, and combines numerical simulation methods to calculate the proportional coefficient between the flow rate of the branch pipeline and the main pipeline under different working conditions, thereby indirectly measuring the flow rate of the main pipeline. However, the defect of this solution is that it is difficult to confirm the proportional coefficient between the main pipeline flow rate and the branch pipeline flow rate.

[0006] Chinese Utility Model Patent No. CN211401322U discloses an ultrasonic industrial flowmeter with accurate measurement. It adopts an interleaved sound channel arrangement method, which has an optimized installation layout, improves the pipeline adaptability of the ultrasonic flowmeter, and thus improves the measurement accuracy. However, the number of transducers required in this flowmeter is too large, and this large-sized measurement probe leads to too high costs; in addition, multiple measurement sound channels are distributed on different levels, making the flow field more complex and changeable, and easily causing problems with measurement accuracy due to changes in the flow field.

[0007] Chinese Patent No. CN117168552A discloses an industrial gas ultrasonic flowmeter, which is provided with a housing and a flowmeter located inside the housing and having a square metering channel; compared with the solution disclosed in Patent Document CN113970365A, this solution can measure the specific flow rate value inside the pipeline well without confirming the proportional coefficient between the main pipeline flow rate and the branch pipeline flow rate; compared with the solution disclosed in Patent Document CN211401322U, this solution does not require too many transducers and can reduce costs; based on this, the solution disclosed in Patent Document CN117168552A has gradually become the mainstream. However, the inventors of the present application found that: in the assembly method disclosed in Patent Document CN117168552A, the flow field at the outlet end of the flowmeter is not good, which affects the accuracy of ultrasonic measurement. Summary of the Invention

[0008] In view of this, the purpose of the present utility model is to provide an ultrasonic flowmeter to optimize the poor flow field at the outlet end of the flowmeter in the aforementioned prior art, which affects the accuracy of ultrasonic measurement.

[0009] To achieve the above purpose, the present utility model provides an ultrasonic flowmeter, including: an inlet fixing member having a first through hole, wherein one end of the first through hole is used to connect a pipeline; a flowmeter body including a housing and a metering module disposed inside the housing, wherein the inlet end of the metering module is directly or indirectly hermetically connected to the other end of the first through hole via the housing, the interior of the metering module has a square metering area, a rectifying member is formed at the outlet end of the metering module, and a pressure dividing area is formed in the area between the housing of the metering module and the housing; an outlet fixing member fixed to the housing and having a second through hole, wherein one end of the second through hole faces the outlet end of the metering module and has a gap therebetween, and the other end of the second through hole is used to connect a pipeline; the square metering area communicates with the pressure dividing area via the outlet end of the metering module and the gap.

[0010] Compared with the prior art, the present utility model has the following advantages and effects:

[0011] In the ultrasonic flowmeter of the present utility model, the fluid medium in the fluid pipeline is introduced into the square metering area in the metering module through the first through hole of the inlet fixing member, and the fluid medium metered in the square metering area enters the second through hole of the outlet fixing member after being rectified by the rectifying member; in the above process, since there is a gap between the outlet end of the metering module and the second through hole, and the square metering area communicates with the pressure dividing area via the outlet end of the metering module and the gap, a pressure dividing area is provided between the square metering area and the external area of the flowmeter. Therefore, the pressure dividing area and the housing can be used to share the pressure difference between the square metering area and the external area of the flowmeter, thereby avoiding the housing of the metering module from being easily damaged due to excessive pressure difference; in addition, since one end of the second through hole faces the outlet end of the metering module, it can effectively make the fluid flowing out of the metering module flow directly into the second through hole as much as possible, so as to reduce the volume of the fluid flowing out of the metering module flowing into the pressure dividing area through the aforementioned gap, thereby reducing the volume of the fluid flowing into the pressure dividing area and the volume of the fluid flowing out of the pressure dividing area and flowing into the gap being equal or approximately equal, and then reducing the interference of the fluid flowing from the pressure dividing area to the gap on the metering area, and then realizing the optimization of the problem of the poor flow field at the outlet end of the flowmeter in the prior art, thereby improving the measurement accuracy. Description of the Drawings

[0012] Figure 1Schematic diagram of the internal structure of the ultrasonic flowmeter in the embodiment of the present utility model;

[0013] Figure 2 Schematic diagram of the internal structure of the metering module in the embodiment of the present utility model;

[0014] Figure 3 Three-dimensional structure diagram of the housing in the embodiment of the present utility model;

[0015] Figure 4 Side view structure diagram of the housing in the embodiment of the present utility model;

[0016] Figure 5 Schematic diagram of the assembly structure of the metering module, the first honeycomb rectifier, the reduced-diameter pipe and the second honeycomb rectifier in the embodiment of the present utility model.

[0017] Explanation of reference numerals:

[0018] 10 - Housing; 11 - Slide bar;

[0019] 20 - Metering module; 21 - Square metering area; 211 - Circular threaded pipe; 212 - Square straight pipe; 22 - Inlet; 23 - Outlet; 24 - Slide groove;

[0020] 30 - First honeycomb rectifier; 31 - Circular pipe sleeve; 311 - External threaded joint; 32 - Honeycomb mesh;

[0021] 40 - First flange; 41 - First flange body; 411 - Second through hole; 42 - First external stop;

[0022] 60 - Reduced-diameter pipe; 61 - Connection end; 62 - Sealing groove;

[0023] 70 - Second honeycomb rectifier;

[0024] 80 - Second flange; 81 - Second flange body; 811 - First through hole; 82 - Second external stop; 821 - Screw hole;

[0025] 90 - Sealing ring;

[0026] 100 - Ultrasonic transducer;

[0027] 110 - Display face cover. Detailed implementation manners

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" 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 an indirect connection through an intermediate medium, and it can also be the communication inside two components. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] Please refer to Figures 1-5 As shown in the figure, the embodiment of the present utility model provides an ultrasonic flowmeter, which includes an inlet fixing member, a flowmeter body, and an outlet fixing member, where:

[0031] The inlet fixing member has a first through hole 811, and one end of the first through hole 811 is used to connect to a pipeline; the flowmeter body includes a housing 10 and a metering module 20, where the metering module 20 is disposed inside the housing 10. A rectifying member is formed at the outlet end of the metering module 20. The inlet end of the metering module 20 is directly or indirectly hermetically connected to the other end of the first through hole 811 via the housing 10. The interior of the metering module 20 has a square metering area 21, and the area between the housing of the metering module 20 and the housing 10 forms a pressure-dividing area; the outlet fixing member is fixed to the housing 10, and the outlet fixing member has a second through hole 411. One end of the second through hole 411 faces the outlet end of the metering module 20 and has a gap therebetween. The other end of the second through hole 411 is used to connect to a pipeline; the square metering area 21 and the pressure-dividing area communicate via the outlet end of the metering module 20 and the said gap.

[0032] It should be noted that the first through hole 811 in this embodiment is the fluid flow channel of the inlet fixing member, and the second through hole 411 is the fluid flow channel of the outlet fixing member.

[0033] In the following text, the outlet 23 is the port through which the fluid in the square metering area 21 inside the metering module 20 flows out, and the inlet 22 is the fluid inlet for entering the square metering area 21 inside the metering module 20.

[0034] The pressure-dividing area is the cavity area between the inner cavity of the housing 10 and the outside of the metering module 20.

[0035] In a specific embodiment, the ultrasonic flowmeter is fixedly installed in the fluid pipeline through an inlet fixing member and an outlet fixing member; the inlet end of the metering module 20 can be directly connected to the first through hole 811, or the inlet end of the metering module 20 can be indirectly and hermetically connected via the housing 10; the external airflow entering from the inlet fixing member is used by the metering module 20 to measure and calculate the flow rate of the fluid medium in the pipeline.

[0036] Since there is a gap between the outlet end of the metering module 20 and the second through hole 411, and the square metering area 21 communicates with the pressure dividing area via the outlet end of the metering module 20 and the gap, a pressure dividing area is provided between the square metering area 21 and the external area of the flowmeter. Therefore, the pressure dividing area and the housing 10 can be used to share the pressure difference between the square metering area 21 and the external area of the flowmeter, thereby preventing the housing of the metering module 20 from being easily damaged due to excessive pressure difference; in addition, since one end of the second through hole 411 is directly opposite to the outlet end of the metering module 20, it can effectively enable the fluid flowing out of the metering module 20 to flow directly into the second through hole 411 as much as possible, so as to reduce the volume of the fluid flowing out of the metering module 20 flowing through the aforementioned gap into the pressure dividing area, thereby reducing the volume of the fluid flowing from the pressure dividing area to the gap and flowing into the square metering area 21, and then reducing the interference of the fluid flowing from the pressure dividing area to the gap on the square metering area 21, and then optimizing the problem of poor flow field at the outlet end of the flowmeter in the prior art, thereby improving the measurement accuracy.

[0037] Further, please refer to Figure 1 As shown, the orthographic projection of the outlet end of the metering module 20 on the second through hole 411 is located within the second through hole 411 and has a first distance L from the inner wall of the second through hole 411 1 。

[0038] Thus, the fluid medium flowing out of the outlet end of the metering module 20 can enter the second through hole 411 of the outlet fixing member connected thereto as much as possible, avoiding disturbing the fluid and thus affecting the measurement of the fluid medium, and ensuring the stability of the fluid measurement.

[0039] As a preferred mode of this embodiment, the overall structure of the outlet end of the metering module 20 can be set as a cylindrical structure, and the second through hole 411 provided at the center of the outlet fixing member can also be a circular hole. In this way, the orthographic projection of the outer wall of the outlet of the rectifier on the second through hole 411 is a circle, the diameter of this circle is smaller than the diameter of the second through hole 411, and the radius difference between this circle and the second through hole 411 is the first distance L 1 。

[0040] In some other embodiments, the overall structure of the outlet end of the metering module 20 can also be set as a square structure. On the one hand, one end of the rectifier close to the square metering area 21 can be smoothly docked with the square metering area 21 of the metering module 20. On the other hand, the orthographic projection of the outlet end of the metering module 20 on the second through hole 411 is a square, and at this time, this square is the inner square of the second through hole 411. Of course, the shape of the corresponding second through hole 411 can also be set as a regular quadrilateral, a regular hexagon, a regular octagon, etc.

[0041] In some other embodiments, the overall structure of the outlet end of the metering module 20 can also be set as a frustum structure and other symmetric star-shaped structures. Similarly, the shape of the second through hole 411 can also be set as a star shape, etc. In this embodiment, no restrictions are imposed on the shapes of the outlet end of the metering module 20 and the second through hole 411, as long as it is satisfied that the orthographic projection of the outer wall of the outlet end of the metering module 20 on the second through hole 411 falls inside the second through hole 411 and is evenly distributed around.

[0042] Further, please refer to Figure 1 As shown, in the direction of the center line of the second through hole 411, there is a second distance L between the outlet end of the metering module 20 and the second through hole 411 2 。

[0043] It should be explained that the center line is the central axis of the second through hole 411. As a preferred mode of this embodiment, the overall structure of the outlet end of the metering module 20 is set as a cylindrical structure, and the second through hole 411 provided at the center of the outlet fixing member is also a circular hole. At this time, in the horizontal direction, there is a second distance L between the orthographic projection of the outlet end of the metering module 20 and the second through hole 411 in the horizontal direction 2 。

[0044] In one implementation mode, the orthographic projection of the outlet end of the metering module 20 and the second through hole 411 in the horizontal direction has an overlapping part. At this time, the second through hole 411 is covered outside the outlet end of the metering module 20, and the displacement value of the second distance L 2 is a negative number.

[0045] In another implementation mode, the orthographic projection of the outlet end of the metering module 20 and the second through hole 411 in the horizontal direction has no overlapping part. At this time, the displacement value of the second distance L 2 is a positive number. In this way, it can ensure that the voltage division effect in the voltage division area is better.

[0046] Further, please refer to Figure 1 As shown, the center line of the second through hole 411 is set to be collinear with the center line of the outlet end of the metering module 20.

[0047] In the present embodiment, when the center line of the second through hole 411 is colinear with the center line of the outlet end of the metering module 20, the fluid flowing out through the outlet end of the metering module 20 at any position in the vertical direction can avoid the influence of fluid fluctuations caused by changes in the inner wall structure of the second through hole 411 as much as possible, thereby minimizing the disturbance at the outlet end of the metering module 20 and causing a reduction in measurement accuracy.

[0048] Furthermore, in this embodiment, the first distance L 1 The value range is 1mm≤L 1 ≤5mm. In this embodiment, the first distance L between the outlet end of the metering module 20 and the inner wall of the second through hole 411 is 1 The main purpose is to prevent most of the fluid from passing through the first spacing L. 1 A vortex is formed when the fluid medium flows out of the outlet end of the metering module 20 and can enter the second through hole 411 of the outlet fixing member connected thereto as much as possible.

[0049] It is understandable that, in order to reduce costs, the housing material of the metering module 20 in this embodiment can be made of plastic. In order to prevent the metering module 20 from being damaged by excessive pressure in the square metering area 21, a gap is set between the second through hole 411 and the outlet end of the rectifier, wherein:

[0050] It should be noted that the first spacing L 1 If the first spacing L is too small, the metering module 20 made of plastic material will be damaged because it bears most of the pressure. 1 If it is too large, the measurement result of the ultrasonic transducer 100 will be affected.

[0051] Furthermore, in this embodiment, the second spacing L 2 The value range is 1mm≤L 2 In this way, while ensuring that the pressure division area can divide the pressure well, it avoids affecting the measurement result of the ultrasonic transducer 100.

[0052] In addition, the second distance L 2 The size and first spacing L 1 The sizes of the metering module 20 and the second through hole 411 are matched and influenced with each other to control the size of the gap between the outlet end of the metering module 20 and the second through hole 411. 2 Reasonable size setting can achieve pressure balance between the pressure division area between the outer shell 10 and the shell of the metering module 20 and the square metering area 21 without disturbing the fluid flow, thereby avoiding the increase of pressure on the metering module 20 due to excessive internal and external pressure difference, which affects the service life of the metering module 20.

[0053] Further, please refer to Figure 1 and 2 As shown, in the metering module 20, a circular threaded pipe 211 is provided at the end of the square metering area 21, and a rectifying member is fitted inside the circular threaded pipe 211.

[0054] In this embodiment, the advantage of such a setting is that: by providing a circular pipe thread 211 on the inner wall of the square metering area 21 near the rectifying member, and threadedly connecting the rectifying member to the outlet 23 position of the square metering area 21, it is not only convenient to install and position the rectifying member, but also the rectifying member has a high level of installation docking and no looseness.

[0055] In some other embodiments, the connection between the rectifying member and the housing of the square metering area 21 can also adopt other connection methods such as plugging, crimping, snap connection, etc. The specific requirement is mainly to be able to fix the rectifying member at the end of the square metering area 21.

[0056] Further, please refer to Figure 1 and 2 As shown, the rectifying member is a first honeycomb rectifier 30, and the first honeycomb rectifier 30 includes a circular pipe sheath 31 and a honeycomb mesh 32, wherein:

[0057] An external thread joint 311 connected to the circular threaded pipe 211 is integrally connected to one side of the circular pipe sheath 31 close to the circular threaded pipe 211, and the external thread joint 311 is in threaded fit connection with the circular threaded pipe 211; the honeycomb mesh 32 is installed inside the circular pipe sheath 31.

[0058] Preferably, in this embodiment, the rectifying member is installed at the end of the square metering area 21 to prevent the metering result in the square metering area 21 from being affected by fluid backflow at the air outlet end of the square metering area 21.

[0059] The setting of the first honeycomb rectifier 30 improves the stability of the flow field in the flow channel, reduces the interference to the ultrasonic transducer 100 in the metering module 20, and improves the stability of metering.

[0060] In some other embodiments, the rectifying member can also be set as, for example, a rectifying plate type or a spiral rectifier. Relatively speaking, the circular metal honeycomb rectifier in this embodiment can withstand a higher fluid load and is particularly suitable for occasions with higher power requirements in industrial and commercial applications.

[0061] Further, please refer to Figure 1 As shown, the outlet fixing member is a first flange 40, and the first flange 40 includes a first flange body 41 and a first outer stop 42, wherein:

[0062] The first flange body 41 is sealingly connected to the end face of the housing 10, and the second through hole 411 is horizontally opened at the center of the first flange body 41;

[0063] The first outer stop 42 is coaxially and integrally connected to one side of the first flange body 41 close to the first honeycomb rectifier 30, and the first outer stop 42 is located inside the housing 10;

[0064] The inner diameter of the first outer stop 42 is coaxially communicated with the second through hole 411, and the inner diameter of the first outer stop 42 is larger than the outer diameter of the circular pipe sleeve 31.

[0065] In this embodiment, the outlet fixing member is preferably the first flange 40. One end of it is not only convenient for butt-joint sealing connection with the housing 10, but also convenient for sealing connection with the fluid pipeline. For example, the first flange body 41 in this embodiment has a mounting flange, and the flange just fits the external structural shape of the housing 10 and is fixedly connected by bolts. The other end of the first flange body 41 also has a threaded pipe orifice, which is convenient for butt-joint with the fluid pipeline.

[0066] Thus, the setting of the first flange 40 not only has a simple structure, low manufacturing cost, convenient for later maintenance, but also can reduce the fluid disturbance and avoid affecting the measurement result.

[0067] In some other embodiments, the outlet fixing member can also be set as a bent pipe or other structural forms. Specifically, which structure to adopt depends on the actual on-site installation conditions on the premise of ensuring the measurement accuracy.

[0068] Further, please refer to Figure 1 、 2 As shown, a plurality of symmetrically arranged guiding grooves are opened in the square metering area 21 along the fluid flow direction, and a plurality of metal rectifying sheets are inserted into the square metering area 21 from the guiding grooves of the square metering area 21, dividing the square metering area 21 into a plurality of flow paths. Preferably, the plurality of flow paths are of the same size.

[0069] Further, please refer to Figure 1 、 2 As shown, a square straight pipe 212 is arranged at the head end of the square metering area 21, a reducing pipe 60 is arranged in cooperation with the front end of the square straight pipe 212, and a second honeycomb rectifier 70 is arranged in cooperation with the inside of the front end of the reducing pipe 60. The fluid medium (hereinafter described by taking the gas medium as an example) enters the square metering area 21 through the second honeycomb rectifier 70, the reducing pipe 60 and the square straight pipe 212.

[0070] In this embodiment, a square straight pipe 212 is provided at the front end of the square measurement area 21. A reduced-diameter pipe 60 is further provided at the front end of the square straight pipe 212, and a second honeycomb rectifier 70 is provided at the front end of the reduced-diameter pipe 60. The second honeycomb rectifier 70 has a large flow cross-sectional area, resulting in extremely small pressure loss of the gas medium. The gas medium enters the square measurement area 21 through the second honeycomb rectifier 70, the reduced-diameter pipe 60, and the square straight pipe 212. The purpose of this setting is as follows: The disordered gas medium at the inlet of the gas pipeline and the inlet fixing part can enter the square measurement area 21 after being rectified at the front stage, making the air flow in the measurement area stable, improving the stability of large-flow gases, and further improving the overall measurement accuracy of the ultrasonic flowmeter.

[0071] Preferably, the gas medium first passes through the second honeycomb rectifier 70 to rectify the gas at the front stage entering the interior of the inlet fixing part from the gas pipeline, and then passes through a section of the reduced-diameter pipe 60 to introduce the air flow into the square measurement area 21. A plurality of metal rectifying fins are provided in the square measurement area 21, and the purpose is to make the air flow into a uniform laminar flow state as much as possible. This area is the core area of ultrasonic measurement. After the laminar flow passes through the square measurement area 21, it enters the first honeycomb rectifier 30 at the end, and then is connected to the gas pipeline through the outlet fixing part; this structure not only has small pressure loss, but also reduces the air flow disturbance in the measurement area, improving the repeatability and the measurement accuracy of large flows.

[0072] This ultrasonic flowmeter can greatly improve the flow field and meet the performance index requirements at low cost.

[0073] Further, please refer to Figure 1 As shown, the inlet fixing part is a second flange 80, and the second flange 80 includes a second flange body 81 and a second outer stop 82, where:

[0074] The second flange body 81 is sealingly connected to the first end face of the housing 10, and a first through hole 811 is horizontally opened at the center of the second flange body 81;

[0075] The second outer stop 82 is coaxially and integrally connected to the side of the second flange body 81 close to the second honeycomb rectifier 70, and the second outer stop 82 is adapted to be sleeved on the outer circumferential surface of the front end of the reduced-diameter pipe 60;

[0076] The inner diameter of the second outer stop 82 is coaxially communicated with the first through hole 811, and the inner diameter of the second outer stop 82 is equal to the outer diameter of the reduced-diameter pipe 60.

[0077] In this embodiment, the inlet fixing member and the outlet fixing member are also preferably of a flange mounting structure, that is, one end of the second flange 80 is conveniently butted and sealedly connected to the housing 10, and the other end is also conveniently sealedly connected to the fluid pipeline. For example, the second flange body 81 in this embodiment has a mounted flange, and the flange just matches the external structural shape of the housing 10 and is fixedly connected by bolts. The other end of the second flange body 81 also has a threaded pipe opening for conveniently docking with the fluid pipeline.

[0078] Thus, the setting of the second flange 80 not only has a simple structure, low manufacturing cost, and convenient later maintenance, but also can reduce the fluid disturbance and avoid affecting the measurement result.

[0079] In some other embodiments, the inlet fixing member can also be set in the form of a bent pipe or other structures. Specifically, which structure is adopted depends on the actual on-site installation conditions on the premise of ensuring the measurement accuracy.

[0080] It should be noted that, to ensure the sealing performance of the connection between the second flange 80 and the housing 10, a sealing ring is also provided at the end face joint of the second flange body 81 and the housing 10 to ensure airtightness.

[0081] Further, please refer to Figure 1 As shown, a connection end 61 is also provided on the outer circumference of the reduced-diameter pipe 60 near the second outer stop 82. A screw hole 821 is provided at the position of the second outer stop 82 opposite to the connection end 61. The connection end 61 is adapted to be fixedly connected to the second outer stop 82 through the screw hole 821 and bolts.

[0082] The reduced-diameter pipe 60 in this embodiment is composed of a straight pipe section and a tapered pipe section. To enable the installation and fixation of the straight pipe section, uniformly distributed connection ends 61 are provided on the outer circumference of the straight pipe section. Through the threaded sealing connection between the connection ends 61 and the second outer stop 82, while ensuring the fixation of the reduced-diameter pipe 60, it can also be fixedly docked with the second flange 80.

[0083] In some other embodiments, the connection manner between the connection end 61 and the second outer stop 82 can also adopt snap connection, pin connection, etc. This embodiment does not limit any connection and fixation manner.

[0084] Further, please refer to Figure 1 As shown, a sealing groove 62 is also provided on the outer circumference of the reduced-diameter pipe 60 near the second outer stop 82. A sealing ring 90 is accommodated in the sealing groove 62, and the sealing ring 90 is located inside the second outer stop 82.

[0085] In this embodiment, to ensure the sealing performance of the fluid pipeline connection, a sealing ring 90 is provided at the threaded connection between the reduced-diameter pipe 60 and the second flange 80 for sealing. Specifically, a sealing groove is provided on the outer circumference of the straight pipe section of the reduced-diameter pipe 60, and the sealing groove is located inside the second outer stop 82. When the sealing ring 90 is placed in the sealing groove, the height of the sealing ring 90 protrudes from the outer circumference of the straight pipe section and is squeezed by the inner wall of the second outer stop 82, thereby achieving sealing.

[0086] In some embodiments, both the housing 10 and the metering module 20 extend along the fluid flow direction; the inlet fixing member and the outlet fixing member are oppositely arranged on both sides of the housing 10 and the metering module 20 along the fluid flow direction; the fluid flow direction is a straight line direction (in the appendix Figure 1 it is a horizontal direction).

[0087] In some embodiments, a first limiting member extending along the fluid flow direction is provided on the inner wall surface of the housing 10, and a second limiting member extending along the fluid flow direction is provided on the outer wall surface of the metering module 20. The second limiting member is adapted to cooperate with the first limiting member to position and install the metering module 20 in the housing 10. By the second limiting member being adapted to cooperate with the first limiting member, the stable installation of the structure of the metering module 20 can be ensured

[0088] Specifically, please refer to Figure 1 As shown, a pair of sliding strips 11 symmetrically arranged along the fluid flow direction are provided in the middle of the inner cavity of the housing 10, and a pair of sliding grooves 24 symmetrically arranged along the fluid flow direction are provided on the outer circumference of the metering module 20. The sliding strips 11 are adapted to move in the corresponding sliding grooves 24 to position and install the metering module 20.

[0089] Thus, by providing the sliding strips 11 on the inner wall of the housing 10 and the sliding grooves 24 corresponding to the sliding strips 11 one by one on the outer circumference of the metering module 20 for positioning and installing the metering module 20, the stable installation of the structure of the metering module 20 is ensured. By providing a pair of sliding strips 11 and a pair of sliding grooves 24, the stable installation of the structure of the metering module 20 can be further ensured.

[0090] Furthermore, please refer to Figure 1 As shown, the metering module 20 further includes two pairs of ultrasonic transducers 100 symmetrically installed in the square metering area 21. A V-shaped transmission and reception path is formed between the transmitting end and the receiving end of the ultrasonic transducer 100.

[0091] In this embodiment, the ultrasonic transducer 100 is directly installed on the pipe wall of the metering module 20. During the installation process, the propagation path between the ultrasonic transducers 100 is avoided from generating deviations as much as possible. Two pairs of ultrasonic transducers 100 are inserted into the measurement pipeline of the metering module 20 at an installation angle of 45 degrees. The ultrasonic transducer 100 is installed in the measurement pipeline of the metering module 20 through a probe cover (not shown in the figure), and the probe cover is further fixed by screws to complete the fastening of the ultrasonic transducer 100. After the installation is completed, the axial directions of the two pairs of ultrasonic transducers 100 are completely coincident.

[0092] Therefore, by adopting the structure combining the housing 10 and the metering module 20, it is not necessary to increase the number of ultrasonic transducers 100 to improve the metering accuracy, and the overall cost is also reduced.

[0093] Furthermore, please refer to Figure 1 、 3 As shown in FIGS. 4, the ultrasonic flowmeter further includes a display face cover 110 provided on the outer surface of the housing 10, and the display face cover 110 is electrically connected to the ultrasonic transducer 100.

[0094] In this embodiment, the display face cover 110 is bolted and fixed to the outer circumference of the housing 10, and the display face cover 110 is electrically connected to the ultrasonic transducer 100, and the measurement result is fed back on the display face cover 110, which is convenient for the user to observe and record.

[0095] Although the present utility model is disclosed as above, the protection scope of the present utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present utility model.

Claims

1. An ultrasonic flow meter, characterized in that: include: The inlet fixing piece has a first through hole, wherein one end of the first through hole is used for connecting a pipeline; A flow meter body, comprising a housing and a metering module disposed in the housing, wherein an inlet end of the metering module is directly or indirectly sealedly connected to the other end of the first through hole via the housing, the interior of the metering module has a square metering area, an outlet end of the metering module is formed with a rectifying component, and an area between the housing of the metering module and the housing forms a pressure dividing area; An outlet fixing piece is fixed to the outer shell and has a second through hole, wherein one end of the second through hole is opposite to the outlet end of the metering module and has a gap between the outlet end of the metering module, and the other end of the second through hole is used for connecting a pipeline; the square metering area and the pressure dividing area are connected via the outlet end of the metering module and the gap.

2. The ultrasonic flowmeter according to claim 1, characterized in that: The orthographic projection of the outlet end of the metering module on the second through hole is located in the second through hole and has a first distance L1 from the inner wall of the second through hole.

3. The ultrasonic flow meter according to claim 1, characterized in that: Along the direction of the center line of the second through hole, there is a second distance L2 between the outlet end of the metering module and the second through hole; The displacement value of the second distance L2 is a positive number.

4. The ultrasonic flow meter according to claim 3, characterized in that: The center line of the second through hole is arranged on the same line as the center line of the outlet end of the metering module.

5. The ultrasonic flow meter according to claim 2, characterized in that: The value range of the first distance L1 is 1mm≤L1≤5mm.

6. The ultrasonic flow meter according to claim 3 or 4, characterized in that: The value range of the second distance L2 is 1mm≤L2≤5mm.

7. The ultrasonic flow meter according to claim 1, characterized in that: The outlet end of the metering module is provided with a circular threaded tube, and the circular threaded tube is provided in cooperation with the rectifying component; The rectifying member is a first honeycomb rectifier, and the first honeycomb rectifier includes: A round tube sheath, wherein a side of the round tube sheath close to the round threaded tube is integrally connected with an external threaded joint connected to the round threaded tube; The honeycomb network is installed in the round tube sheath.

8. The ultrasonic flow meter according to claim 7, characterized in that: The outlet fixing member is a first flange, and the first flange includes: A first flange body is sealed and connected to the end surface of the housing, and the second through hole is horizontally opened at the center of the first flange body; A first outer stopper is coaxially and integrally connected to a side of the first flange body close to the first honeycomb rectifier, and the first outer stopper is located inside the housing; The inner diameter of the first outer stop is coaxially connected to the second through hole, and the inner diameter of the first outer stop is larger than the outer diameter of the round tube sheath.

9. The ultrasonic flow meter according to claim 1, characterized in that: The square metering area is provided with a plurality of symmetrically arranged guide grooves along the fluid flow direction, and a plurality of metal rectifiers are inserted into the square metering area through the guide grooves of the square metering area to divide the square metering area into a plurality of flow paths.

10. The ultrasonic flow meter according to claim 1, characterized in that: A square straight tube is arranged at the head end of the square metering area, a necked tube is arranged at the front end of the square straight tube, a second honeycomb rectifier is arranged inside the front end of the necked tube, and the fluid medium enters the square metering area through the second honeycomb rectifier and the necked tube.

11. The ultrasonic flow meter according to claim 10, characterized in that: The inlet fixing member is a second flange, and the second flange includes: A second flange body is sealed and connected to the front end surface of the housing, and the first through hole is horizontally opened at the center of the second flange body; A second outer stopper is coaxially and integrally connected to a side of the second flange body close to the second honeycomb rectifier, and the second outer stopper is suitable for being sleeved on the outer circumferential surface of the front end of the shrinking tube; The inner diameter of the second outer stop is coaxially connected to the first through hole, and the inner diameter of the second outer stop is equal to the outer diameter of the front end of the shrink tube; The shrink tube is also provided with a connection end on the outer circumference of the side close to the second outer stop, and the second outer stop is provided with a screw hole opposite to the connection end, and the connection end is suitable for being fixedly connected with the second outer stop through the screw hole and the bolt; A sealing groove is further provided on the outer circumference of the shrink tube on the side close to the second outer stop. A sealing ring is accommodated in the sealing groove, and the sealing ring is located inside the second outer stop.

12. The ultrasonic flow meter according to claim 1, characterized in that: The housing and the metering module both extend along the fluid flow direction; The inlet fixing member and the outlet fixing member are arranged on both sides of the housing and the metering module in a direction opposite to each other along the fluid flow direction; The fluid flow direction is a straight line direction; The inner wall surface of the shell is provided with a first stopper extending along the flow direction of the fluid, and the outer wall surface of the metering module is provided with a second stopper extending along the flow direction of the fluid, and the second stopper is suitable for cooperating with the first stopper to position and install the metering module in the shell; One of the first limiting member and the second limiting member is a pair of symmetrically arranged sliding bars, and the other is a pair of symmetrically arranged sliding grooves; The metering module further includes two pairs of ultrasonic transducers symmetrically mounted in the square metering area, and a V-shaped transmitting and receiving path is formed between the transmitting end and the receiving end of the ultrasonic transducer; The ultrasonic flow meter further comprises a display cover arranged on the outer surface of the shell, and the display cover is electrically connected to the ultrasonic transducer.

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