Zero-point automatic compensation mass flow meter

Abstract

The utility model discloses a zero-point automatic compensation mass flow meter, which comprises a flow pipe, an oscillating device, a medium conveying pipe, a zero-point automatic compensation device, a zero-point automatic compensation device, a zero-point automatic compensation device and a zero-point automatic compensation device, and is characterized in that the flow pipe is connected with an adapting pipe and an oscillating device; the heating device is embedded in the folding pipe section; the triangular outer tube is arranged on the flow tube in a sleeving manner; and the sensor is arranged on the triangular outer tube and is used for sensing the oscillating flow tube. Compared with a common mass flow meter, the mass flow meter has the advantages that the flow pipe and a conveying medium are preheated through the heating device, and internal stress of the flow pipe is automatically and quickly released in cooperation with the folding pipe section, so that zero-point automatic compensation of the flow meter is realized, and the accuracy of flow meter data at the zero point of the flow meter in a static and natural state of the conveying medium is ensured; and therefore, the accuracy of the measured flow value of the subsequently flowing conveying medium is ensured. The multi-layer folding pipe is designed to be matched with the connecting piece, and leakage-free and sealed installation of the heating device is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of flow meters, and specifically relates to a mass flow meter with automatic zero compensation. Background Art

[0002] A mass flow meter is a new type of intelligent instrument that measures parameters such as the mass, density, and temperature of the fluid flowing through a pipeline based on the Coriolis effect. Specifically, the flow tube below the mass flow meter performs simple harmonic vibration (or circular motion). When the fluid medium flows through the measuring tube at a certain speed, on the one hand, the medium vibrates synchronously (simple harmonic vibration or circular motion) with the flow tube, and on the other hand, it continues to pass through the pipeline at this speed. At this time, the medium generates a reaction force perpendicular to the flow direction of the medium on the pipeline, that is, the "Coriolis force"; under the action of this force, the synchronous vibration at the symmetric positions of the measuring tube changes to asynchronous vibration, and this asynchrony is reflected as a phase difference in the vibration signal waveform. The value of the phase difference is proportional to the mass flow rate of the medium. By detecting the phase difference of the signal through the detection circuit, the mass flow rate of the medium can be obtained.

[0003] When the common mass flow meter performs zero calibration, due to temperature changes, stress is generated inside the flow tube, and this stress cannot be quickly released. As a result, when zero calibration is performed, there is an error in the oscillation curve of the flow tube, making the zero state of the flow meter and the corresponding data inaccurate, and further affecting the measured value when the conveying medium flows. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a mass flow meter with automatic zero compensation to solve the problem that when the common mass flow meter performs zero calibration, due to temperature changes, stress is generated inside the flow tube, and this stress cannot be quickly released. As a result, when zero calibration is performed, there is an error in the oscillation curve of the flow tube, making the zero state of the flow meter and the corresponding data inaccurate, and further affecting the measured value when the conveying medium flows.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: A mass flow meter with automatic zero compensation, comprising:

[0006] A flow tube, which is connected to a receiving tube and an oscillation device, and the end of the receiving tube is connected to a medium conveying tube, including a straight pipe section and a folded pipe section;

[0007] A heating device, which is embedded on the folded pipe section;

[0008] A triangular outer tube, which is sleeved on the flow tube;

[0009] A sensor, which is arranged on the triangular outer tube to sense the oscillating flow tube.

[0010] As a further description of the above technical solution:

[0011] The end of the receiving pipe is connected to the medium delivery pipe through a flange.

[0012] As a further description of the above technical solution:

[0013] The folded pipe section includes an inner folded pipe and an outer folded pipe that are sleeved and fitted together. Notches are provided on the inner folded pipe and the outer folded pipe, and the heating device is assembled at the notches through a sealing ring.

[0014] As a further description of the above technical solution:

[0015] A connecting piece is provided at the connection between the heating device and the folded pipe section.

[0016] As a further description of the above technical solution:

[0017] The connecting piece is provided with a first wedge surface and a second wedge surface that are respectively fitted with the inner side of the inner folded pipe and the outer side of the outer folded pipe. A limiting side surface that abuts against the notch of the folded pipe section is provided between the first wedge surface and the second wedge surface.

[0018] In summary, due to the adoption of the above technical solution, the present utility model has the following

[0019] Beneficial effects:

[0020] This mass flowmeter preheats, heats, and keeps warm the flow tube and the conveying medium through a heating device, and cooperates with the folded pipe section to release the internal stress of the flow tube, thereby realizing the zero-point automatic compensation of the flowmeter, ensuring the accuracy of the flowmeter data at the zero point of the flowmeter when the conveying medium is stationary and in a natural state, and further ensuring the accuracy of the measured value of the flow of the subsequent flowing conveying medium. The multi-layer folded pipe design cooperates with the connecting piece to ensure the leak-free and sealed installation of the heating device. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of a mass flowmeter with zero-point automatic compensation.

[0023] Figure 2 It is a cross-sectional view of the folded pipe section in a mass flowmeter with zero-point automatic compensation.

[0024] Figure 3 It is a schematic structural diagram of a heating device in a mass flowmeter with automatic zero compensation.

[0025] Legend:

[0026] 1. Flow tube; 11. Straight pipe section; 12. Folded pipe section; 121. Inner folded pipe; 122. Outer folded pipe; 13. Heating device; 14. Connector; 141. First wedge surface; 142. Limiting side surface; 143. Second wedge surface; 2. Triangular outer pipe; 3. Sensor; 4. Receiving pipe; 5. Flange; 6. Medium conveying pipe. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0029] Please refer to Figures 1-3 , the present invention provides a technical solution: a mass flowmeter with automatic zero compensation, including:

[0030] A flow tube 1, which is connected to a receiving pipe 4 and an oscillation device, and the end of the receiving pipe 4 is connected to a medium conveying pipe 6, including a straight pipe section 11 and a folded pipe section 12;

[0031] A heating device 13, which is embedded on the folded pipe section 12;

[0032] A triangular outer pipe 2, which is sleeved on the flow tube 1;

[0033] A sensor 3, which is arranged on the triangular outer pipe 2 to sense the oscillating flow tube 1.

[0034] The end of the receiving pipe 4 is connected to the medium conveying pipe 6 through a flange 5.

[0035] The folding pipe section 12 includes an inner folding pipe 121 and an outer folding pipe 122 that are sleeved and fitted together. Notches are provided on the inner folding pipe 121 and the outer folding pipe 122, and the heating device 13 is assembled at the notch through a sealing ring.

[0036] A connecting piece 14 is provided at the connection between the heating device 13 and the folding pipe section 12.

[0037] The connecting piece 14 is provided with a first wedge surface 141 and a second wedge surface 143 that are respectively fitted with the inner side of the inner folding pipe 121 and the outer side of the outer folding pipe 122. A limiting side surface 142 that abuts against the notch of the folding pipe section 12 is provided between the first wedge surface 141 and the second wedge surface 143.

[0038] The working principle of a mass flowmeter with zero-point automatic compensation in this embodiment includes: When performing zero-point calibration of the mass flowmeter, the conveying medium is introduced into the flow tube 1, and the heating device 13 preheats and heats the flow tube 1 and the conveying medium to the required temperature. The folding pipe section 12 expands to initially release the structural internal stress formed by temperature changes for zero-point automatic compensation. The valve isolates the conveying medium in the flow tube 1, and the oscillation device oscillates the flow tube 1. At this time, the state is marked as the zero-point state of the flowmeter. Then, the valve is opened, and based on the Coriolis principle, the normal flow measurement of the conveying medium is performed. During this period, the internal stress of the flow tube 1 caused by temperature and other reasons can be released through the folding pipe section, thereby ensuring the full oscillation of the flow tube 1 and the accuracy of the measured value of the medium flow.

[0039] In summary, due to the adoption of the above technical solutions, a mass flowmeter with zero-point automatic compensation in this embodiment has the following beneficial effects compared with the prior art:

[0040] This mass flowmeter preheats, heats, and insulates the flow tube and the conveying medium through the heating device, and cooperates with the folding pipe section to release the internal stress of the flow tube, thereby realizing the zero-point automatic compensation of the flowmeter, ensuring the accuracy of the flowmeter data at the zero point of the flowmeter when the conveying medium is stationary and in a natural state, and further ensuring the accuracy of the measured value of the flow of the subsequent flowing conveying medium. The multi-layer folding pipe design cooperates with the connecting piece to ensure the leak-free and sealed installation of the heating device.

[0041] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A mass flow meter with automatic zero point compensation, characterized in that: include: A flow tube, which is connected to a receiving tube and an oscillating device, wherein the end of the receiving tube is connected to a medium conveying tube, and includes a straight tube section and a folded tube section; A heating device, which is embedded in the folded tube section; A triangular outer tube, which is sleeved on the flow tube; A sensor is disposed on the triangular outer tube to sense the oscillating flow tube.

2. A mass flowmeter with automatic zero point compensation according to claim 1, characterized in that: The end of the receiving pipe is connected to the medium conveying pipe through a flange.

3. A mass flowmeter with automatic zero point compensation according to claim 1, characterized in that: The folded tube section comprises an inner folded tube and an outer folded tube which are sleeved and fitted together. Notches are arranged on the inner folded tube and the outer folded tube. The heating device is assembled at the notches through a sealing ring.

4. A mass flow meter with automatic zero point compensation according to claim 3, characterized in that: A connecting piece is arranged at the connection between the heating device and the folded pipe section.

5. A mass flowmeter with automatic zero point compensation according to claim 4, characterized in that: The connecting member is provided with a first wedge-shaped surface and a second wedge-shaped surface which are respectively spliced ​​with the inner side of the inner folding tube and the outer side of the outer folding tube, and a limiting side surface which abuts against the notch of the folding tube section is provided between the first wedge-shaped surface and the second wedge-shaped surface.

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