Coil structure for Coriolis mass flowmeter

Abstract

The invention discloses a coil structure for a Coriolis mass flowmeter, which relates to the technical field of Coriolis mass flowmeters and comprises a coil framework wound with a high-temperature enameled wire; the two metal connecting pins are fixed on the coil framework and are respectively connected with the wire inlet end and the wire outlet end of the high-temperature enameled wire; one end of the metal connecting piece is fixedly connected with the coil framework, and the other end of the metal connecting piece is used for being fixedly connected to a fastener of a measuring tube. The coil structure for the Coriolis mass flowmeter is simple in connection and assembly, and the coil framework cannot be damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of Coriolis mass flowmeters, and particularly to a coil structure for a Coriolis mass flowmeter. Background Art

[0002] One of the core components of a high-temperature resistant Coriolis mass flowmeter sensor is a high-temperature coil. The long-term stability and high manufacturing cost of the high-temperature coil have always troubled the development of high-temperature Coriolis mass flowmeters. Currently, in order to adapt to the high-temperature coil, the Coriolis mass flowmeter uses ceramics as the material of the coil skeleton. However, during the assembly process, external forces directly act on the ceramic coil skeleton. When the force is too large or uneven, it is extremely easy to cause damage to the ceramic coil skeleton, thereby affecting the use of the flowmeter. Therefore, there is an urgent need to design a technical solution with simple connection and assembly and that will not cause damage to the coil skeleton. Summary of the Invention

[0003] The purpose of the present invention is to provide a coil structure for a Coriolis mass flowmeter to solve the problems existing in the above-mentioned prior art, with simple connection and assembly and without causing damage to the coil skeleton.

[0004] To achieve the above purpose, the present invention provides the following solution:

[0005] The present invention provides a coil structure for a Coriolis mass flowmeter, including: a coil skeleton around which a high-temperature enameled wire is wound; the material of the coil skeleton can be selected according to needs, and the present invention uses a ceramic coil skeleton; two metal connection pins fixed on the coil skeleton and respectively connected to the inlet end and the outlet end of the high-temperature enameled wire; a metal connecting piece, one end of which is fixedly connected to the coil skeleton, and the other end is used for fixedly connecting to a fastener of a measuring tube. The present invention uses the metal connecting piece to be respectively connected to the coil skeleton and the fastener of the measuring tube, thereby avoiding direct contact between the fastener and the coil skeleton during the installation process, solving the problem that the coil skeleton is easily broken during the installation process, and selecting a metal material with a thermal expansion coefficient close to that of the ceramic material as the manufacturing material of the metal connecting piece, with more stable performance under high-temperature conditions. Therefore, the structure of the present invention can operate stably under high-temperature conditions, reducing costs while greatly improving the installation convenience and structural stability.

[0006] Preferably, an inwardly concave wire groove is provided on the outer side wall of the coil skeleton, the high-temperature enameled wire is wound in the wire groove, and one end of the metal connection pin is fixed on the outer wall of the coil skeleton.

[0007] Preferably, an installation cavity is provided at one end of the coil skeleton, and the metal connecting piece is fixed in the installation cavity.

[0008] Preferably, the installation cavity penetrates from one end to the other end of the coil bobbin.

[0009] Preferably, a sealing plate is integrally formed in the installation cavity. The sealing plate divides the installation cavity into a first cavity and a second cavity, and one end of the metal connecting piece is fixed in the first cavity.

[0010] Preferably, the metal connecting piece is a metal nut. One end of it is fixed on the coil bobbin by brazing, gas welding, threading, pressing or bonding, and the other end is fixed on the fastener of the measuring tube through a support plate.

[0011] Preferably, the material of the metal connecting piece is iron-nickel-cobalt alloy, molybdenum, titanium, copper or stainless steel; the material of the metal connecting pin is the same as that of the metal connecting piece.

[0012] Preferably, the two metal connecting pins are respectively fixed on both sides of the coil bobbin.

[0013] Preferably, the two metal connecting pins are fixedly parallel on the same side of the coil bobbin.

[0014] Preferably, the metal connecting pin is provided with a wire hole, and the incoming wire end or the outgoing wire end of the high-temperature enameled wire is wound and fixed in the corresponding wire hole; the shape of the metal connecting pin is a stepped shape arranged axially, and the radial cross-section of each step is circular, square or rhombic.

[0015] The present invention has achieved the following technical effects compared with the prior art:

[0016] The present invention uses metal connecting pieces to be connected with the fasteners of the coil bobbin and the measuring tube respectively, so as to avoid direct contact between the fasteners and the coil bobbin during the installation process, and solves the problem that the coil bobbin is easily broken during the installation process. A metal material with a thermal expansion coefficient close to that of the ceramic material is selected as the manufacturing material of the metal connecting piece, and the performance is more stable under high-temperature conditions. Therefore, the structure of the present invention can work stably under high-temperature conditions, reduce costs, and greatly improve the installation convenience and structural stability. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0018] Figure 1 It is a schematic cross-sectional view of the coil structure for a Coriolis mass flowmeter in one or some embodiments of the present invention.

[0019] In the figure: 1 - coil bobbin, 2 - metal connecting nut, 3 - metal connecting pin, 4 - high-temperature enameled wire. Specific implementation mode

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] The object of the present invention is to provide a coil structure for a Coriolis mass flowmeter to solve the problems existing in the above-mentioned prior art, with simple connection and assembly and no damage to the coil bobbin.

[0022] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation modes.

[0023] In the current coil structure for a Coriolis mass flowmeter, during the assembly process, the ceramic coil bobbin is directly connected to the fastener, so that the external force directly acts on the ceramic coil bobbin. When the force is too large or uneven, it is very easy to cause damage to the ceramic coil bobbin. To solve this problem, the present invention provides a coil structure for a Coriolis mass flowmeter, refer to Figure 1As shown in the figure, it includes a coil bobbin 1, metal connection pins 3 and a metal connector. The coil bobbin 1 is a support frame structure for winding coils. The coil is flexible and is supported after being wound around the coil bobbin 1. Thus, the coil bobbin 1 acts as a support for the coil, similar to a skeleton. The specific material of the coil bobbin 1 can be flexibly selected according to actual situations. In this embodiment, a ceramic coil bobbin is used as an example for illustration. A high-temperature enameled wire 4 is wound around the ceramic coil bobbin 1. Two metal connection pins 3 are fixed on the coil bobbin 1 and are respectively connected to the incoming end and the outgoing end of the high-temperature enameled wire 4. One end of the metal connector is fixedly connected to the coil bobbin 1, and the other end is used for fixedly connecting to the fastener of the measuring tube. In the installation process of the present invention, direct contact between the fastener and the coil bobbin 1 is avoided, and the coil bobbin 1 is connected to the fastener by a metal connector, solving the problem that the coil bobbin 1 is easily broken due to direct external force impact during the installation process. The installation is convenient, the stability is high, the manufacturing process is simple, it can be compatible with mass flow meters of various calibers, has strong versatility, wide coverage, and low cost. Due to different thermal expansion coefficients between the materials of the coil bobbin 1, the connection method is difficult. To avoid this problem, in this embodiment, a metal material with a thermal expansion coefficient close to that of the ceramic material is selected as the metal connector, and its performance is more stable under high-temperature conditions. The high-temperature enameled wire 4 is an enameled wire that can withstand relatively high temperatures. An enameled wire is a metal wire with an insulating paint coated on the surface of a conductor, consisting of a conductor and an insulating layer. After the bare wire is annealed and softened, it is then coated with paint and baked multiple times. It has four major characteristics: mechanical properties, chemical properties, electrical properties, and thermal properties.

[0024] In one embodiment, in order to better arrange the high-temperature enameled wire 4, in this embodiment, a concave wire groove is opened on the outer side wall of the coil bobbin 1, and the high-temperature enameled wire 4 is wound in the wire groove. One end of the metal connection pin 3 is fixed on the outer wall of the coil bobbin 1, and the two metal connection pins 3 are respectively fixed on both sides of the coil bobbin 1. Or the two metal connection pins 3 are fixedly arranged in parallel on the same side of the coil bobbin 1, and no specific limitation is made.

[0025] In order to make the connection of the high-temperature enameled wire 4 more firm, in this embodiment, the metal connection pin 3 is provided with a wire hole, and the incoming end or the outgoing end of the high-temperature enameled wire 4 is wound and fixed in the corresponding wire hole. The shape of the metal connection pin 3 is a stepped shape arranged along the axis, and the radial cross-section of each step is circular, square or diamond-shaped.

[0026] One end of the coil bobbin 1 of this embodiment is provided with an installation cavity. The metal connecting piece is a metal connecting nut 2, and the shape of the metal connecting nut 2 can be a cylinder, a stepped cylinder or a stepped square, and one end of it is fixed in the installation cavity. The metal connecting pin 3 and the metal connecting nut 2 can be firmly welded to the coil bobbin 1 as a whole through a ceramic brazing process. When assembling, the external force directly acts on the metal connecting nut 2, thus avoiding the damage of the coil bobbin 1 caused by directly receiving the external force. In addition, the metal connecting pin 3 and the metal connecting nut 2 can also be assembled with the coil bobbin 1 as a whole through more economical fixing methods such as threading, brazing, and bonding.

[0027] In one embodiment, the installation cavity penetrates from one end of the coil bobbin 1 to the other end of the coil bobbin 1. In another embodiment, a sealing plate is integrally formed in the installation cavity, and the sealing plate divides the installation cavity into a first cavity and a second cavity, and one end of the metal connecting piece is fixed in the first cavity.

[0028] The present invention uses a metal connecting piece to be respectively connected with the fastener of the coil bobbin 1 and the measuring tube, so that in the installation process, the fastener is prevented from directly contacting the coil bobbin 1, and the problem that the coil bobbin 1 is easily broken during the installation process is solved. The metal connecting piece does not directly connect with the measuring tube either. A support plate is used to connect one end of the metal piece far away from the coil bobbin 1 with the fastener of the measuring tube, which is convenient for disassembly and assembly; a metal material with a thermal expansion coefficient close to that of the ceramic material is selected as the manufacturing material of the metal connecting piece, and the performance is more stable under high temperature conditions. Therefore, the structure of the present invention can work stably under high temperature conditions, reduce costs, and greatly improve the installation convenience and structural stability at the same time.

[0029] As can be seen from Table 1, in the range of 0 °C to 500 °C, the ones with thermal expansion coefficients close to that of the ceramic are iron-nickel-cobalt alloy and molybdenum, followed by titanium, copper, and stainless steel. It is recommended to use the same material with a thermal expansion coefficient close to that of the ceramic.

[0030]

[0031] Based on the above table, the materials of the metal connecting piece and the metal connecting pin 3 in this embodiment are iron-nickel-cobalt alloy, molybdenum, titanium, copper or stainless steel.

[0032] Specific examples are applied in the present invention to elaborate on the principle and implementation manner of the present invention. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A coil structure for a Coriolis mass flowmeter, characterized in that: Comprising: A coil bobbin around which a high-temperature enameled wire is wound; Two metal connection pins fixed to the coil bobbin and respectively connected to the inlet end and the outlet end of the high-temperature enameled wire; A metal connecting member, one end of which is fixedly connected to the coil bobbin and the other end of which is used for fixedly connecting to a fastener of a measuring tube.

2. The coil structure for a Coriolis mass flowmeter according to claim 1, characterized in that: A concave wire groove is formed on the outer side wall of the coil bobbin, the high-temperature enameled wire is wound in the wire groove, and one end of the metal connection pin is fixed to the outer wall of the coil bobbin.

3. The coil structure for a Coriolis mass flowmeter according to claim 1, characterized in that: An installation cavity is formed at one end of the coil bobbin, and the metal connecting member is fixed in the installation cavity.

4. The coil structure for a Coriolis mass flowmeter according to claim 3, characterized in that: The installation cavity penetrates from one end of the coil bobbin to the other end of the coil bobbin.

5. The coil structure for a Coriolis mass flowmeter according to claim 4, wherein: A sealing plate is integrally formed in the installation cavity, the sealing plate divides the installation cavity into a first cavity and a second cavity, and one end of the metal connecting member is fixed in the first cavity.

6. The coil structure for a Coriolis mass flowmeter according to claim 1, wherein: The metal connecting member is a metal nut, one end of which is fixed to the coil bobbin by brazing, gas welding, threading, pressing or bonding, and the other end is fixed to a fastener of a measuring tube through a support plate.

7. The coil structure for a Coriolis mass flowmeter according to claim 1, wherein: The material of the metal connecting member is iron-nickel-cobalt alloy, molybdenum, titanium, copper or stainless steel; the material of the metal connection pin is the same as that of the metal connecting member.

8. The coil structure for a Coriolis mass flowmeter according to claim 1, characterized in that: The two metal connection pins are respectively fixed on two sides of the coil bobbin.

9. The coil structure for a Coriolis mass flowmeter according to claim 1, characterized in that: The two metal connection pins are fixedly arranged in parallel on the same side of the coil bobbin.

10. The coil structure for a Coriolis mass flowmeter according to claim 1, characterized in that: A wire hole is formed on the metal connection pin, and the inlet end or the outlet end of the high-temperature enameled wire is wound and fixed in the corresponding wire hole; the shape of the metal connection pin is a stepped shape arranged axially, and the radial cross section of each step is circular, square or diamond-shaped.

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