An insertion type vortex flowmeter

Abstract

The utility model relates to the technical field of electromagnetic flowmeters, and in particular to an insertion-type swirl flowmeter, including a swirl tube arranged in a pipeline, a piezoelectric sensor device, and a cantilever beam structure for fixedly connecting the swirl tube and the piezoelectric sensor device; the swirl tube is composed of a measuring tube and a swirl guide plate and a swirl body core installed therein, and the piezoelectric sensor in the piezoelectric sensor device is arranged in the flat section of the measuring tube. This design fills a gap in similar products at home and abroad; it can make the pressure loss of the on-site pipeline basically "zero"; it can be combined with the original converter to well preserve the original reliability, stability, good repeatability, small hysteresis and related use functions during process control or measurement; it has a wide range of applicable specifications: ≤DN2000, a long service life, high cost performance, wide use, and a large market development prospect for an insertion-type swirl flowmeter.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic flowmeters, in particular to an insertion type swirl flowmeter. Background Art

[0002] With the rapid development of science and technology and the rapid development of large-scale industrial production, fluid measurement technology has been widely used along with the global economic industrialization and trade settlement. Fluid measurement technology and scientific application technology are one of the important components of the relevant technical field and occupy an indispensable position in the national economy.

[0003] In the process of energy cooperation in various industries, trade accounting is inevitable. In the process of trade accounting, flow meters must be used for process control or trade accounting. The vortex flowmeter is suitable for process control or measurement of process media such as liquid, gas, high-temperature superheated steam and saturated or steam, or for measurement for trade accounting. Therefore, it is widely used in power industry (including nuclear industry), chemical industry, petroleum, metallurgy, electricity, scientific research, domestic and foreign fluid trade settlement, and also in various industrial and civil fields such as thermal heating that are closely related to people's lives, and has broad development and application prospects.

[0004] Based on the method of directed basic research, basic research and application of certain basic knowledge are provided for the identification and solution of currently known or foreseeable problems in the future.

[0005] The insertion type swirl flowmeter is based on the original flange type swirl flowmeter. In order to solve the inherent structural defects of the original flange type swirl flowmeter, namely, excessive pressure loss in the on-site pipeline and small application range, the utility model studies and designs a flowmeter with a new structure - an insertion type swirl flowmeter. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides an insertion type swirl flowmeter.

[0007] The utility model discloses an insertion type swirl flowmeter, comprising a swirl tube arranged in a pipeline, a piezoelectric sensor device and a cantilever beam structure for fixedly connecting the swirl tube and the piezoelectric sensor device; the swirl tube is composed of a measuring tube and a swirler guide plate and a swirler body core installed therein, and the piezoelectric sensor in the piezoelectric sensor device is arranged in the flat section of the measuring tube.

[0008] Preferably, the cantilever beam structure includes a wire connecting tube and a piezoelectric sensor fixing seat, a reinforced graphite small gasket, a high temperature resistant sealant, a reinforced graphite large gasket, a wire connecting tube fixing seat and a converter fixing device fixedly connected to an external converter, which are installed on the wire connecting tube from bottom to top.

[0009] Preferably, the cantilever beam structure further comprises a square fixing plate for stabilizing the exterior of the wire connecting tube, which is connected to the wire connecting tube.

[0010] Preferably, the piezoelectric sensor fixing seat includes a seat body connected to the spiral vortex tube and the wire connecting tube, and a grade A flat washer and a standard spring washer are arranged in the seat body and connected by a hexagon socket head screw.

[0011] Preferably, the dimensions of the wire connecting tube are: outer diameter φ38, wall thickness φ8.5.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The insertion type vortex flowmeter fills a gap in similar products at home and abroad.

[0014] 2. After the piezoelectric sensor of the inserted vortex flowmeter is combined with the original converter, the original reliability, stability, good repeatability, small hysteresis and related functions of process control or measurement are well preserved.

[0015] 3. The insertion type vortex flowmeter can make the pressure loss of the on-site pipeline basically "zero".

[0016] 4. The flow meter proposed by the utility model is applicable to a wide range of specifications: ≤DN2000, has a long service life, high cost performance, is widely used, and is an insertion type vortex flow meter with great market development prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view structural schematic diagram of the utility model;

[0018] Figure 2 It is a right view structural schematic diagram of the utility model;

[0019] Figure 3 This is a structural schematic diagram of the first installation embodiment of the utility model;

[0020] Figure 4 This is a structural schematic diagram of the second installation embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of the laminar flow distribution of the medium flowing into the pipeline of the utility model;

[0022] Figure 6 This is a schematic diagram of turbulent flow distribution in a medium flow pipeline of the utility model;

[0023] Markings in the attached drawings: 1. swirl tube; 11. measuring tube; 12. swirler guide plate; 13. swirler body core; 2. piezoelectric sensing device; 21. piezoelectric sensor; 22. converter; 3. cantilever beam structure; 31. piezoelectric sensor fixing seat; 311. seat body; 312. Class A flat washer; 313. standard spring washer; 314. hexagon socket head screw; 32. reinforced small graphite gasket; 33. high temperature resistant sealant; 34. reinforced large graphite gasket; 35. wire connecting tube fixing seat; 36. square fixing plate; 37. converter fixing device; 38. wire connecting tube. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0025] like Figure 1-6 The utility model is an insertion type vortex flowmeter, comprising a vortex tube 1 arranged in a pipeline, a piezoelectric sensor device 2 and a cantilever beam structure 3 for fixedly connecting the vortex tube 1 and the piezoelectric sensor device 2; the vortex tube 1 is composed of a measuring tube 11 and a vortex guide plate 12 and a vortex core 13 installed therein, and the piezoelectric sensor 21 in the piezoelectric sensor device 2 is arranged in the flat section of the measuring tube 11.

[0026] Preferably, the cantilever beam structure 3 includes a wire connecting tube 38 and a piezoelectric sensor fixing seat 31, a reinforced graphite small gasket 32, a high temperature resistant sealant 33, a reinforced graphite large gasket 34, a wire connecting tube fixing seat 35 and a converter fixing device 37 fixedly connected to the external converter 22, which are installed on the wire connecting tube 38 from bottom to top.

[0027] Preferably, the cantilever beam structure 3 further includes a square fixing plate 36 for stabilizing the outside of the wire connecting tube 38 , and the square fixing plate 36 is connected to the wire connecting tube 38 .

[0028] Preferably, the piezoelectric sensor fixing seat 31 includes a seat body 311 connecting the spiral vortex tube 1 and the wire connecting tube 38, and a class A flat washer 312 and a standard spring washer 313 are arranged in the seat body 311, which are connected by a hexagon socket head screw 314.

[0029] Preferably, the dimensions of the wire connection tube 38 are: outer diameter φ38, wall thickness φ8.5.

[0030] Design ideas

[0031] 1. The basis for the implementation of this utility model:

[0032] The insertion type vortex flowmeter is developed and designed according to national standards (GB / T3836.1-2021, GB / T3836.2-2021, GB / T3836.4-2021, JB / T9248-2015) and other standards. In addition, the product is calibrated according to the calibration procedure for vortex flowmeters (JJG1121-2015).

[0033] The production process, operating procedures for each process, relevant raw materials, mechanical processing, and welding standards are all designed and produced in accordance with relevant standards.

[0034] 2. The core purpose of this utility model:

[0035] (1) The insertion type vortex flowmeter fills a gap in similar products at home and abroad.

[0036] (2) After the sensor of the insertion type vortex flowmeter is combined with the original converter 22, the original reliability, stability, good repeatability, small hysteresis and related usage functions during process control or measurement are well preserved.

[0037] (3) The insertion type vortex flowmeter can make the pressure loss of the on-site pipeline basically "zero".

[0038] (4) It is an insertion type vortex flowmeter with a wide range of applicable specifications: ≤DN2000, long service life, high cost performance, wide application and great market development prospects.

[0039] 3. Design difficulties of the overall structure of the utility model:

[0040] (1) Since it is an insertion type vortex flowmeter, designing the seal of its piezoelectric sensor 21 is one of the difficulties.

[0041] (2) Insertion-type vortex flowmeters are currently a blank in similar products at home and abroad. The selection of the insertion depth is the biggest difficulty. It needs to be accurately determined by combining fluid mechanics analysis and experiments.

[0042] (3) One of the difficulties in designing the mechanical strength of the sensor of an inserted vortex flowmeter in large pipelines and with high flow rates is the process medium.

[0043] Design principle:

[0044] 1. How to achieve stable sealing of the piezoelectric sensor 21 of the inserted vortex flowmeter:

[0045] According to the special structural characteristics of the insertion type vortex flowmeter, in order to meet the requirements of high temperature, high pressure and other process technical parameters, the piezoelectric sensor device 2 adopts an external plug-in structure, and the material of the sealing gasket is graphite reinforced composite plate. The sealing structure diagram is as follows Figure 1-2 shown.

[0046] 2. How to determine the insertion depth of the insertion type vortex flowmeter:

[0047] Based on the relevant knowledge of fluid mechanics, this paper discusses and studies from the following aspects:

[0048] (1) Density of fluid medium:

[0049] The mass of the fluid does not change with external conditions, but the volume of the fluid is closely related to temperature and pressure, that is, the density of the fluid is an inseparable function of temperature and pressure.

[0050] (2) Viscosity of fluid medium:

[0051] In real life, when observing the flow of water in a river, we can see that the water flows fastest in the center of the river, and the closer to the shore, the slower it flows. Similarly, when a fluid flows in a pipe, the flow rate in the center of the pipe is fastest, and the flow rate becomes slower as it gets closer to the pipe wall. This is because when the fluid flows, it is due to the viscosity of the fluid medium and the friction generated inside the pipe.

[0052] Due to the relationship between the density and viscosity of the fluid medium, the speed of each internal layer of all fluid media is different when flowing. There is a pair of equal and opposite forces on the contact surface of adjacent layers. The faster flow layer drives the slower flow layer to speed up, and the slower flow layer blocks the faster flow layer to slow it down. This blocking force is called internal friction, and the interaction between fluids is called fluid internal friction (ie: Newton's law of internal friction), and viscosity is a measure of internal friction, which is the ability of the fluid to resist deformation.

[0053] (3) Reynolds number and flow pattern:

[0054] According to the flow state and velocity distribution of the fluid in the measuring tube, the Reynolds number is an important parameter to characterize the flow characteristics of the fluid. The Reynolds number characterizes the dimensionless parameters of the inertial force and the viscous force when the fluid flows, and its ratio is given by the following formula:

[0055] Re=VD / γ(when the pipe is a round pipe)

[0056] Where: V----average velocity of the flow cross section in meters per second (m / s) D----characteristic flow length is the pipe diameter in meters (m) γ----kinematic viscosity of the fluid in square meters per second (m 2 / s)

[0057] When the cross section of the flowing medium is a circular tube, there is a common critical Reynolds number Rec. Generally, Rec=2300.

[0058] When Re<Rec, the fluid in the pipe is laminar flow (laminar flow is when the trajectory of the fluid particle changes with the initial spatial coordinates x, y, z and time t, it is a regular smooth curve, and the simplest case is a straight line.) Figure 5 As shown;

[0059] When Re>Rec, the fluid in the pipe is turbulent (turbulence is the irregular movement of the fluid, and various quantities in the flow field change disorderly with time and space coordinates.) Figure 6 As shown;

[0060] During use, the fluid generates vortex for the first time when it passes through the vortex starter, and then under the throttling effect of the venturi tube contraction section, the vortex generates an accelerating vortex for the second time, thereby enabling the insertion type vortex flowmeter to make the pressure loss of the on-site pipeline basically "zero". Figure 3-4 .

[0061] (4) According to the working conditions or flow velocity corresponding to the pipe diameter range specified in relevant national standards, the calculated Reynolds number Re < critical Reynolds number Rec = 2300, so that the fluid in the pipeline is laminar flow. Therefore, through theoretical analysis and sample testing, it is determined that the insertion depth is 1 / 2 of the inner diameter of the on-site pipeline, which is the best position. On-site installation position assembly Figure 3 (Scheme 1), if Figure 5 As shown. Or the final assembly of the on-site installation location Figure 4 (Scheme 2), if Figure 4 As shown. Which solution to adopt depends on the user's design requirements. When open flames are not allowed on site, bolts are used to fasten the connection. The cost of solution one is relatively high. Solution two is to connect on site by welding, which is simple and easy and has a relatively low cost.

[0062] 3. Calculation of mechanical strength of the sensor of the insertion type vortex flowmeter:

[0063] After the insertion type vortex flowmeter is assembled, the cantilever beam structure 3 is connected to the piezoelectric sensor device 2. The process medium will generate a strong impact force on the cantilever beam structure 3 under the action of a strong flow rate. Therefore, according to the flow rate, the structural strength of the cantilever beam wire tube is reasonably solved through theoretical calculation. The size of the cantilever beam wire tube is: φ38 (outer diameter) × 8.5 (wall thickness).

[0064] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An insertion type vortex flowmeter, characterized in that: The invention comprises a swirl tube (1) arranged in a pipeline, a piezoelectric sensing device (2) and a cantilever beam structure (3) for fixedly connecting the swirl tube (1) and the piezoelectric sensing device (2); the swirl tube (1) is composed of a measuring tube (11) and a swirler guide plate (12) and a swirler body core (13) installed therein; and the piezoelectric sensor (21) in the piezoelectric sensing device (2) is arranged in a flat section of the measuring tube (11).

2. An insertion type vortex flowmeter according to claim 1, characterized in that: The cantilever beam structure (3) comprises a wire connecting tube (38) and a piezoelectric sensor fixing seat (31), a reinforced graphite small gasket (32), a high temperature resistant sealant (33), a reinforced graphite large gasket (34), a wire connecting tube fixing seat (35) and a converter fixing device (37) fixedly connected to an external converter (22) which are sequentially installed on the wire connecting tube (38) from bottom to top.

3. An insertion type vortex flowmeter as claimed in claim 2, characterized in that: The cantilever beam structure (3) also includes a square fixing plate (36) for stabilizing the outside of the wire connecting tube (38), which is connected to the wire connecting tube (38).

4. An insertion type vortex flowmeter as claimed in claim 2, characterized in that: The piezoelectric sensor (21) fixing seat comprises a seat body (311) connected to the vortex tube (1) and the wire connection tube (38), wherein a class A flat washer (312) and a standard spring washer (313) are arranged in the seat body and connected via a hexagon socket head screw (314).

5. An insertion type vortex flowmeter as claimed in claim 2, characterized in that: The dimensions of the wire connection tube (38) are: outer diameter φ38, wall thickness φ8.5.

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