Tubular mass flow meter

Abstract

The utility model provides a tubular mass flow meter which comprises a heat preservation shell, two measuring tubes are arranged in the heat preservation shell and arranged in parallel, and driving parts and detecting parts are arranged at the bottoms and on the two sides of the two measuring tubes. The two ends of the two measuring pipes are communicated with a first flow divider and a second flow divider respectively, one end of the first flow divider and one end of the second flow divider are jointly communicated with a supporting pipe, the two ends of the supporting pipe are both communicated with flanges, and the bottom of the heat preservation shell is connected with a base. The heat preservation shell is utilized to preserve heat of the two measuring pipes preliminarily, the electric tracing band is utilized to make close contact with the surface of the heat preservation shell, electric energy is converted into heat energy, heat is transmitted to the measuring pipes in a heat conduction mode, a heat radiation mode and the like, the temperature of the measuring pipes is increased, and heating and heat preservation of fluid in the mass flow meter are achieved. Therefore, the measurement requirement of the mass flow meter on fluid with weak flow capacity is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of mass flowmeters, and more specifically, particularly relates to a tube-in-tube mass flowmeter. Background Art

[0002] A mass flow meter is an instrument used to measure the mass flow of gas or liquid. It can accurately measure the mass flow of fluids without being affected by parameters such as fluid temperature, pressure, density, etc. Its core structure is a flow sensor, which mainly includes U-tube type, thermal type, pressure difference type, vibration type and other types. The flow sensor is mostly cylindrical in shape, with a corresponding structure inside, which mainly detects the mass flow of the fluid. The U-tube mass flow meter is mainly composed of four parts: a U-tube, a sensor, a controller and a display. The fluid is divided into two branches in the U-tube, and the flow rate is determined by calculating the transfer time of the two branches.

[0003] The existing Chinese patent publication number is CN219714445U, which discloses a micro-bend tube-in-tube mass flowmeter, including a housing and a tube-in-tube mechanism, wherein the tube-in-tube mechanism includes a plurality of capillary bends, and the outer wall of the capillary bends is provided with two connecting assemblies, and the connecting assemblies include two tube clamps. The utility model clamps the rotating rod with tweezers to rotate, so that the two ends of the rotating rod drive the rubber column to move, and the moved rubber column is fixed under the limit of the new positioning circular groove. When the spacing of the capillary bends needs to be increased, the rotating rod rotates in the axial direction, and the rotating rod drives the two circular arc rails away, and the circular arc rails drive the capillary bends away from each other, and the entire transverse or longitudinal capillary bends are separated from the overall tube-in-tube mechanism, and are drawn out of an opening of the guide bend, reducing the number of capillary bends, achieving the effect of adjusting the spacing of the capillary bends, avoiding the problem of mutual interference of the vibration of the capillary bends due to excessive flow, and improving the measurement accuracy at high flow. When the above-mentioned mass flow meter is actually used, since the mass flow meter only fixes the outer shell to the outside of the guide elbow, in actual measurement, since the flow capacity of some fluids is very weak, for example, media with a dynamic viscosity of 1000mPa·s, such as asphalt, crude oil, adhesives, paraffin, etc., the fluid temperature needs to be increased to 80℃~160℃ and maintained stably, but the mass flow meter lacks measures to keep the fluid warm, and the temperature range it can measure is -50℃~60℃, which can easily lead to difficulties in the flow of some fluids, thereby easily affecting the accuracy of the measurement results.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a shell-and-tube mass flowmeter is provided to achieve a more practical purpose. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a tube-in-tube mass flowmeter, which is achieved by the following specific technical means:

[0006] A tube-in-tube mass flowmeter comprises an insulation shell, wherein two measuring tubes are arranged inside the insulation shell, the two measuring tubes are arranged in parallel, driving components and detection components are arranged at the bottom and both sides of the two measuring tubes, the two ends of the two measuring tubes are respectively connected to a first diverter and a second diverter, one end of the first diverter and the second diverter are commonly connected to a supporting tube, both ends of the supporting tube are connected to flanges, the bottom of the insulation shell is connected to a base, the outer wall of the insulation shell is wrapped with an electric heating tape, the electric heating tape is spirally coiled, the outer wall of the insulation shell is sleeved with elastic metal clips near the top and the bottom, and the electric heating tape is arranged inside the elastic metal clips.

[0007] Furthermore, one end of the support tube is connected to one end of the first diverter, and the other end is connected to one end of the second diverter. The first diverter is provided with an inlet and two outlets, one of the inlets is connected to the support tube, and the two outlets are respectively connected to the inlets of two measuring tubes. The second diverter is provided with two inlets and one outlet, the two inlets are respectively connected to the outlets of the two measuring tubes, and one outlet is connected to the support tube.

[0008] Furthermore, a bracket is connected to the top center of the support tube, and a detection dial is connected to the top of the bracket.

[0009] Furthermore, a plurality of distance plates are commonly sleeved on the two measuring tubes, and the tube shapes of the two measuring tubes are both set to be slightly curved.

[0010] Furthermore, a first connecting plate and a second connecting plate are connected to the openings of the two elastic metal clips, and the first connecting plate and the second connecting plate are connected by fixing bolts and locking nuts.

[0011] Furthermore, the distance plate is configured as a rectangular stainless steel plate with a hole in the middle, and the heat-insulating shell is made of copper.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. In the utility model, the two measuring tubes are preliminarily insulated by the insulation shell, and the electric heating tape is in close contact with the surface of the insulation shell to convert electrical energy into thermal energy, and the heat is transferred to the measuring tubes by heat conduction and heat radiation, so that the temperature of the measuring tubes is increased, and the heating and heat preservation of the fluid inside the mass flow meter are realized, thereby ensuring the measurement requirements of the mass flow meter for fluids with weaker flow capacity;

[0014] 2. The electric heating tape is clamped on the outer wall of the insulation shell by setting an elastic metal clip, which ensures that the electric heating tape can be continuously wrapped on the outer wall of the insulation shell. The electric heating tape is safe and reliable, and will not have problems such as leakage and dripping caused by steam heating. It will not pollute the environment and will not generate waste gas and wastewater. It is more environmentally friendly and can adjust the temperature according to actual needs to ensure that the temperature of the measuring tube is maintained within the range required by the fluid, thereby improving measurement reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional structure diagram of the utility model. Figure 1 .

[0016] Figure 2 This is a three-dimensional structure diagram of the utility model. Figure 2 .

[0017] Figure 3 The utility model Figure 2 A is an enlarged schematic diagram.

[0018] Figure 4 It is a three-dimensional structural schematic diagram of the utility model with the thermal insulation shell removed.

[0019] In the figure, the corresponding relationship between the component names and the figure numbers is as follows:

[0020] 1. Insulation shell; 2. Measuring tube; 3. Support tube; 4. Flange; 5. Driving component; 6. Detection component; 7. Distance plate; 8. Bracket; 9. Detection dial; 10. First shunt; 11. Second shunt; 12. Base; 13. Electric heating tape; 14. Elastic metal clip; 15. First connecting plate; 16. Second connecting plate; 17. Fixing bolt; 18. Locking nut. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0022] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0024] As attached Figure 1 To Attachment Figure 4 As shown:

[0025] The utility model provides a tube-in-tube mass flowmeter, comprising a heat-insulating shell 1, wherein two measuring tubes 2 are arranged in parallel inside the heat-insulating shell 1, and a driving component 5 and a detecting component 6 are arranged at the bottom and both sides of the two measuring tubes 2. The driving component 5 can be an excitation component, which is composed of a permanent magnet, a coil winding and a bracket, and is fixed on the measuring tube 2. When the coil winding obtains an alternating power supply, an alternating magnetic field is generated along the hollow axis through the attraction and repulsion of the permanent magnet, and is coupled with the natural frequency of the measuring tube 2; the detecting component 6 detects the vibration of the measuring tube 2, and the detecting component 6 is composed of a permanent magnet, a coil winding and a bracket, and is also fixed on the measuring tube 2. When the measuring tube 2 vibrates, the permanent magnet and the coil winding generate relative motion to form a sinusoidal induced electromotive force. When a medium flows through, the induced electromotive force of the left and right coil windings under the action of the Coriolis force generates a phase difference, and the difference is proportional to the mass of the medium flowing through; the two ends of the two measuring tubes 2 are respectively connected There are a first diverter 10 and a second diverter 11, one end of the first diverter 10 and the second diverter 11 are connected to a support tube 3, both ends of the support tube 3 are connected to flanges 4, the bottom of the insulation shell 1 is connected to a base 12, the outer wall of the insulation shell 1 is wrapped with an electric heating tape 13, the electric heating tape 13 is spirally coiled, the electric heating tape 13 is a flat belt made of a conductive polymer and a metal wire, which converts electrical energy into thermal energy to generate heat to heat the insulation shell 1, the electric heating tape 13 is safe and reliable, and will not cause problems such as leakage and dripping caused by steam heating, nor will it cause pollution to the environment, and will not generate waste gas and wastewater, which is more environmentally friendly, and can adjust the temperature according to actual needs to ensure that the temperature of the measuring tube 2 is maintained within the range required by the fluid, thereby improving the measurement reliability; the outer wall of the insulation shell 1 is provided with elastic metal clips 14 near the top and bottom, and the electric heating tape 13 is arranged inside the elastic metal clips 14.

[0026] In other embodiments, one end of the support tube 3 is connected to one end of the first diverter 10, and the other end is connected to one end of the second diverter 11. The first diverter 10 is provided with an inlet and two outlets, one inlet is connected to the support tube 3, and the two outlets are respectively connected to the inlets of the two measuring tubes 2; the second diverter 11 is provided with two inlets and one outlet, the two inlets are respectively connected to the outlets of the two measuring tubes 2, and one outlet is connected to the support tube 3.

[0027] In other embodiments, a bracket 8 is connected to the top center of the support tube 3, and a detection dial 9 is connected to the top of the bracket 8. The detection dial 9 can display the actual mass flow data of the detection fluid.

[0028] In other embodiments, a plurality of distance plates 7 are commonly sleeved on the two measuring tubes 2. The plurality of distance plates 7 can reduce the vibration coupling of the measuring tube 2, so that the measuring tube 2 has strong anti-interference ability. The tube shapes of the two measuring tubes 2 are both set to be slightly curved, which effectively reduces pressure loss, reduces fluid resistance, improves anti-interference ability, and has excellent characteristics such as high precision, high sensitivity, and low pressure loss.

[0029] In other embodiments, the openings of the two elastic metal clips 14 are connected to a first connecting plate 15 and a second connecting plate 16, and the first connecting plate 15 and the second connecting plate 16 are connected by fixing bolts 17 and locking nuts 18. The fixing bolts 17 and locking nuts 18 are used to tighten the openings of the elastic metal clips 14, thereby ensuring the clamping effect of the elastic metal clips 14 on the electric heating tape 13, and ensuring that the electric heating tape 13 can be continuously wrapped around the outer wall of the insulation shell 1.

[0030] In other embodiments, the distance plate 7 is configured as a rectangular stainless steel plate with a hole in the middle. By fixing the distance plate 7, the center distance between the two measuring tubes 2 is ensured to be consistent, thereby ensuring their symmetry and parallelism. The insulation shell 1 is made of copper. The insulation shell 1 made of copper has good thermal conductivity and can quickly transfer heat to the measuring tube 2.

[0031] The specific usage and function of this embodiment are as follows:

[0032] In the utility model, the measuring fluid is connected with the two measuring tubes 2 through two flanges 4, and the fluid enters the interior of the two measuring tubes 2. The driving component 5 drives a pair of measuring tubes 2 to vibrate, and the driving component 5 is located in the center of the measuring tube 2. The driving component 5 is an excitation component, which is composed of a permanent magnet, a coil winding and a bracket, and is fixed on the measuring tube 2. When the coil winding obtains an alternating power supply, an alternating magnetic field is generated along the hollow axis through the attraction and repulsion of the permanent magnet, and is coupled with the natural frequency of the measuring tube 2. In order to detect the basic working frequency of the dial 9, the detection component 6 detects the vibration of the measuring tube 2. The detection component 6 is composed of a permanent magnet, a coil winding and a bracket, and is fixed on the flow tube. When the measuring tube 2 vibrates, the permanent magnet and the coil winding produce relative motion to form a sinusoidal induced electromotive force. When a medium flows through, the induced electromotive force of the left and right coil windings under the action of the Coriolis force produces a phase difference, and the difference is proportional to the mass of the medium flowing through. The detection dial 9 calculates the output value accordingly.

[0033] When it is necessary to detect a fluid with a weaker flow capacity, the electric heating tape 13 is spirally coiled and wrapped around the outer wall of the insulation shell 1, the insulation shell 1 is used to preliminarily insulate the two measuring tubes 2, and the electric heating tape 13 is used to make close contact with the surface of the insulation shell 1, the electric heating tape 13 is started for heating, and the electrical energy is converted into thermal energy, and the heat is transferred to the measuring tube 2 by means of heat conduction and thermal radiation, so that the temperature of the measuring tube 2 is increased, thereby achieving the heating and insulation of the fluid inside the mass flowmeter, thereby ensuring the measurement requirements of the mass flowmeter for fluids with weaker flow capacity.

[0034] It should be noted that the specific models and specifications of the driving component 5, the detection component 6, the detection dial 9, the first diverter 10, the second diverter 11 and the electric heating tape 13 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail. The driving component 5, the detection component 6, the detection dial 9, the first diverter 10, the second diverter 11 and the electric heating tape 13 are devices or equipment existing in the prior art, or are devices or equipment that can be realized in the prior art. The power supply, specific composition and principles thereof are clear to those skilled in the art and are common knowledge in this field, so they will not be described in detail.

[0035] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A tube-in-tube mass flowmeter, characterized in that: The invention comprises a heat-insulating shell (1), wherein two measuring tubes (2) are arranged inside the heat-insulating shell (1), wherein the two measuring tubes (2) are arranged in parallel, wherein driving components (5) and detection components (6) are arranged at the bottom and both sides of the two measuring tubes (2), wherein the two ends of the two measuring tubes (2) are respectively connected to a first flow divider (10) and a second flow divider (11), wherein one end of the first flow divider (10) and the second flow divider (11) are commonly connected to a support tube (3), wherein both ends of the support tube (3) are connected to flanges (4), wherein the bottom of the heat-insulating shell (1) is connected to a base (12), wherein the outer wall of the heat-insulating shell (1) is wrapped with an electric heating belt (13), wherein the electric heating belt (13) is arranged in a spiral coil, wherein the outer wall of the heat-insulating shell (1) is sleeved with elastic metal clips (14) near the top and the bottom, wherein the electric heating belt (13) is arranged inside the elastic metal clips (14).

2. The shell-and-tube mass flowmeter according to claim 1, characterized in that: One end of the support tube (3) is connected to one end of the first flow splitter (10), and the other end is connected to one end of the second flow splitter (11); the first flow splitter (10) is provided with an inlet and two outlets, one of the inlets is connected to the support tube (3), and the two outlets are respectively connected to the inlets of the two measuring tubes (2); the second flow splitter (11) is provided with two inlets and one outlet, the two inlets are respectively connected to the outlets of the two measuring tubes (2), and one outlet is connected to the support tube (3).

3. The shell-and-tube mass flowmeter according to claim 1, characterized in that: A bracket (8) is connected to the center of the top of the support tube (3), and a detection dial (9) is connected to the top of the bracket (8).

4. The shell-and-tube mass flowmeter according to claim 1, characterized in that: A plurality of distance plates (7) are commonly sleeved on the two measuring tubes (2), and the tube shapes of the two measuring tubes (2) are both slightly curved.

5. The shell-and-tube mass flowmeter according to claim 1, characterized in that: A first connecting plate (15) and a second connecting plate (16) are connected to the openings of the two elastic metal clips (14); the first connecting plate (15) and the second connecting plate (16) are connected via fixing bolts (17) and locking nuts (18).

6. The shell-and-tube mass flowmeter according to claim 4, characterized in that: The distance plate (7) is configured as a rectangular stainless steel plate with a hole in the middle, and the heat-insulating shell (1) is made of copper.

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