Grounding ring of low-conductivity electromagnetic flowmeter and electromagnetic flowmeter
By adding a connecting bridge and the grounding inner ring on the grounding ring of the low-conductivity electromagnetic flowmeter, the contact area between the liquid and the grounding ring is increased, the problems of zero point drift and accuracy reduction in low-conductivity liquid measurement are solved, and a higher level of The detection accuracy and reduces cost.
Patent Information
- Application Number
- CN202420115743.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-17
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-01-17
AI Technical Summary
Low-conductivity liquids are prone to zero point drift and reduced accuracy when measured in electromagnetic flowmeters. Traditional methods solve the problem by increasing the liquid contact area of the grounding ring, but there are problems such as high material cost, complex processing and installation, and difficult to standardize.
Design a grounding ring of a low conductivity electromagnetic flowmeter. By adding a connecting bridge and an inner grounding ring on the traditional grounding ring, the detected liquid can also be fully grounded at the axial center of the water column flowing during the grounding process, and the The grounding water column is divided into multiple pieces to increase the contact area with the grounding ring.
By increasing the contact area between the liquid and the grounding ring, the error of zero-point drift is reduced, the detection accuracy of the electromagnetic flowmeter is improved, and the problems of high material costs and complex installation in traditional methods are avoided.
Smart Images
Figure CN222505508U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electromagnetic flowmeters, in particular to a grounding ring of a low-conductivity electromagnetic flowmeter and the electromagnetic flowmeter. Background Art
[0002] In the application field of electromagnetic flowmeter, the conductive liquid in the electromagnetic flowmeter moves by cutting the magnetic lines of force, thereby generating an induced electromotive force signal, and then the electromotive force signal is processed accordingly to calculate the flow rate of the fluid for flow measurement. During the operation of the electromagnetic flowmeter, since the electromagnetic flowmeter induced signal is easily interfered by the low voltage, a grounding ring is usually required to ground the conductive liquid in the electromagnetic flowmeter. In addition, any voltage measurement requires a zero-level reference point, and the potential difference between the measured potential and the zero-level reference point is the measured voltage. In this field, the electromotive force signal of the electromagnetic flowmeter is based on the detected fluid medium as the zero-level reference point.
[0003] However, for electromagnetic flowmeters that measure low-conductivity liquids, zero drift and reduced accuracy often occur due to the large body resistance of the low-conductivity liquid. At present, the body resistance is often reduced by increasing the liquid contact area of the grounding ring, that is, increasing the contact area with the detected liquid, so as to reduce the impact of zero drift and reduced accuracy. However, the current method for increasing the liquid contact area of the grounding ring is to lengthen the grounding ring and extend it into the meter body to increase the contact area with the detected liquid. This method has high material costs and high processing and installation requirements. Since the extended part must be in close contact with the pipeline, the grounding ring needs to be highly adapted to different pipelines, which is difficult to standardize and very troublesome. When the flow field velocity is unstable, the zero-level reference still has the problem of drift.
[0004] Based on the above problems, the present application proposes a grounding ring for a low-conductivity electromagnetic flowmeter. On the basis of the traditional grounding ring, a connecting bridge and a grounding inner ring are added to the grounding ring, so that during the grounding process of the detected liquid, the axial center of the circulating water column can also be fully grounded, and the grounded water column is divided into multiple blocks, so that the contact area between the detected liquid and the grounding ring is larger when passing through the grounding ring, thereby reducing the error of zero drift, so that the detection of the electromagnetic flowmeter is more accurate. Utility Model Content
[0005] To achieve the above objectives, the utility model is implemented through the following technical solutions: The utility model provides a grounding ring for a low-conductivity electromagnetic flowmeter, comprising: a grounding outer ring, a grounding inner ring and a connecting bridge;
[0006] The grounding outer ring is in the shape of a circular ring;
[0007] The grounding inner ring is in a circular shape and is located inside the grounding outer ring;
[0008] The connecting bridge is connected between the grounding inner ring and the grounding outer ring;
[0009] There are a plurality of connecting bridges, and an annular area is provided between the outer wall of the grounded inner ring and the inner wall of the grounded outer ring. Each of the connecting bridges divides the annular area into a plurality of sector rings.
[0010] Preferably, the grounded outer ring and the grounded inner ring are coaxially arranged.
[0011] Preferably, there are four connecting bridges, one end of each connecting bridge is connected to the inner wall of the grounding outer ring, and the other end of each connecting bridge is connected to the outer wall of the grounding inner ring.
[0012] Preferably, each of the connecting bridges is centrally symmetrically arranged with the central axis of the grounding inner ring as the center.
[0013] Preferably, the grounding outer ring, the grounding inner ring and each of the connecting bridges are integrally formed.
[0014] Preferably, the wall thickness of the grounding outer ring is 2-4 mm.
[0015] Preferably, the inner diameter of the grounded outer ring is 3-6 times the inner diameter of the grounded inner ring.
[0016] Preferably, the circumferential dimension of each of the connecting bridges along the grounding inner ring is no greater than 2 mm.
[0017] Preferably, the grounding ring of the low-conductivity electromagnetic flowmeter further comprises a support arm, which is arranged on the outer wall of the grounding outer ring, and is used to fix the grounding ring of the low-conductivity electromagnetic flowmeter at the outlet of the conductive liquid pipeline.
[0018] Preferably, the electromagnetic flowmeter is installed with a grounding ring of any one of the above low-conductivity electromagnetic flowmeters.
[0019] It can be seen from the above technical solutions that the utility model has the following advantages:
[0020] In the utility model, a grounding ring for a low-conductivity electromagnetic flowmeter is provided, comprising: a grounding outer ring, a grounding inner ring and a connecting bridge; the grounding inner ring is arranged inside the grounding outer ring, the grounding outer ring is connected to the grounding inner ring through a plurality of connecting bridges, and a plurality of fan rings are formed inside the grounding outer ring, and the conductive liquid in the electromagnetic flowmeter is grounded through the grounding outer ring, the connecting bridge and the grounding inner ring; through the coordinated use of the above components, the conductive liquid passing through the electromagnetic flowmeter is grounded at multiple positions, wherein the central part of the conductive liquid is grounded through the grounding inner ring, and the outer ring part of the conductive liquid is grounded through the grounding outer ring, and in addition, the conductive liquid also forms a continuous grounding structure through a plurality of circumferentially distributed connecting bridges, so as to ensure that the conductive liquid is more fully in contact with the grounding ring. In the conventional technology, when the conductive liquid flows through the grounding ring, only the circumference of the inner wall of the grounding ring can fully ground the conductive liquid, and the conductive liquid cannot be fully grounded when it flows through the central part of the grounding ring. In the present application, the cross-section of the water column of the conductive liquid flowing through the grounding ring is changed from a circle to a plurality of sector rings and circles within each of the sector rings, so that the center position of the water column of the conductive liquid flowing through the grounding ring and the radial position connected by the connecting bridge can also be more fully grounded, thereby reducing the detection error caused by the zero point drift caused by insufficient grounding, and achieving the technical effect of improving the detection accuracy of the electromagnetic flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.
[0022] Figure 1 It is a front view structural schematic diagram of a grounding ring of a low-conductivity electromagnetic flowmeter according to an embodiment of the present application;
[0023] Figure 2 It is a schematic diagram of the top view structure of a grounding ring of a low-conductivity electromagnetic flowmeter according to an embodiment of the present application.
[0024] The accompanying drawings are denoted as follows:
[0025] 1- Grounding outer ring; 2- Grounding inner ring; 3- Connecting bridge; 4- Support arm. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] As used in the present invention, the singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in a sense including "and / or", the term "several" is generally used in a sense including "at least one", and the term "at least two" is generally used in a sense including "two or more". In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features. The term "proximal end" is usually the end close to the operator, and the term "distal end" is usually the end close to the patient. "One end" and "the other end" as well as "proximal end" and "distal end" usually refer to two corresponding parts, which include not only the endpoints. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. In addition, as used in the present utility model, an element is arranged on another element, which usually only means that there is a connection, coupling, matching or transmission relationship between the two elements, and the connection, coupling, matching or transmission between the two elements can be direct or indirect through an intermediate element, and it cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, one element can be in any position such as inside, outside, above, below or on one side of another element, unless the content clearly indicates otherwise. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0028] Please refer to Figure 1As shown, a grounding ring of a low-conductivity electromagnetic flowmeter in this embodiment includes: a grounding outer ring 1, a grounding inner ring 2 and a connecting bridge 3; the grounding outer ring 1 and the grounding inner ring 2 are both circular rings, the grounding inner ring 2 is located inside the grounding outer ring 1, and the wall thickness of the grounding inner ring 2 and the connecting bridge 3 does not exceed the wall thickness of the grounding inner ring 2; the connecting bridge 3 is connected between the grounding inner ring 2 and the grounding outer ring 1; a plurality of connecting bridges 3 are provided, and an annular area is provided between the outer wall of the grounding inner ring 2 and the inner wall of the grounding outer ring 1, and each connecting bridge 3 divides the annular area into a plurality of fan rings.
[0029] It is worth noting that the grounding outer ring 1 can also be in other shapes such as an ellipse. The shape of the grounding outer ring 1 is determined according to the shape of the outlet end of the conductive liquid water pipeline. The grounding inner ring 2 can also be in other known shapes such as an ellipse and a circular outlet inside. The grounding outer ring 1 and the grounding inner ring 2 are both in a ring shape, which is only one of the optimal embodiments proposed in this application. The above various shapes should all fall within the protection scope of this application, and this application does not make too many restrictions here.
[0030] Please refer to Figure 1 As shown, in this embodiment, the grounding outer ring 1 and the grounding inner ring 2 are coaxially arranged; four connecting bridges 3 are arranged, one end of each connecting bridge 3 is used to connect with the inner wall of the grounding outer ring 1, and the other end is used to connect with the outer wall of the grounding inner ring 2, and the four connecting bridges 3 are arranged in a cross shape around the grounding inner ring 2, and each adjacent two connecting bridges 3 are perpendicular to each other.
[0031] In other alternative embodiments, the connecting bridges 3 may also be provided in one, two, three or more numbers, and each of the connecting bridges 3 may be centrally symmetrically arranged with respect to the central axis of the grounding inner ring 2, so as to minimize the zero drift error generated by the electromagnetic flowmeter; in addition, each of the connecting bridges 3 may also be axially symmetrically arranged with respect to the central axis of the grounding inner ring 2. When there are three connecting bridges 3, the three connecting bridges 3 are arranged at 120 degrees to each other, or one connecting bridge 3 is arranged perpendicular to the other two connecting bridges 3. At this time, two fan-shaped spaces are formed between the grounding inner ring 2 and the grounding outer ring 1 for the conductive liquid in the electromagnetic flowmeter to pass through; when there is only one connecting bridge 3, it can be connected between the inner wall of the grounding outer ring 1 and the outer wall of the grounding inner ring 2 at any position according to different working conditions. At this time, a fan-shaped space is formed between the grounding inner ring 2 and the grounding outer ring 1 for the conductive liquid in the electromagnetic flowmeter to flow through; The cross-shaped connecting bridge setting of the four connecting bridges proposed in this application that are perpendicular to each other is only one of the embodiments with the best practical application effect. In actual applications, the number and form of the connecting bridges 3 can be adjusted according to different on-site working conditions to adapt to various different usage scenarios. The above-mentioned various known shapes and quantities of connecting bridges should be within the protection scope of this application, and this application will not make too many elaborations and limitations here.
[0032] It is worth noting that in the present application, the grounding outer ring 1, the grounding inner ring 2 and the connecting bridge 3 are all made of conductive metal, and the conductive metal includes copper, aluminum or galvanized iron materials; in addition, the grounding outer ring 1, the grounding inner ring 2 and the connecting bridge 3 are integrally formed to prevent leakage of the conductive liquid during the grounding process. In other alternative embodiments, the grounding inner ring 2, the grounding outer ring 1 and the connecting bridge 3 can also be connected by a closed connection method such as welding, and the above is not further limited in the present application.
[0033] Please refer to Figure 1 and Figure 2 As shown, in this embodiment, the wall thickness of the grounded outer ring 1 is 2 mm, the inner diameter of the grounded outer ring 1 is 5 times the inner diameter of the grounded inner ring 2, and the circumferential dimension of each of the connecting bridges 3 along the grounded inner ring 2 is not greater than 2 mm. The above is only the optimal embodiment under normal working conditions. In other alternative embodiments, when the size of the conductive liquid water pipeline of the electromagnetic flowmeter is larger, or the flow rate of the conductive liquid water pipeline of the electromagnetic flowmeter is faster, the wall thickness of the grounded outer ring 1 and the circumferential dimension of the connecting bridge 3 along the grounded inner ring 2 can be increased, such as when the flow rate of the conductive liquid water pipeline is greater than 2 m 3 / s, the wall thickness of the grounding outer ring 1 can be 4mm. When the area of the pipe orifice of the conductive liquid water pipeline is larger than the conventional size, that is, the outer diameter is larger than 34mm, the circumferential dimension of each connecting bridge 3 along the grounding inner ring can be 3mm. The above can be adjusted accordingly according to the specific working conditions and usage scenarios, and should all fall within the protection scope of this application, so this application will not make too many restrictions here.
[0034] Please refer to Figure 1 As shown, the grounding ring of a low-conductivity electromagnetic flowmeter proposed in the present application is suitable for installation on the electromagnetic flowmeter, rather than for conventional lightning protection or preventing leakage of industrial equipment. In addition, the grounding ring of the low-conductivity electromagnetic flowmeter also includes a support arm 4, which is arranged on the outer wall of the grounding outer ring 1. The support arm 4 can be one or two, and a bolt hole or a clamping groove is arranged on the support arm 4. The support arm 4 is used to fix the grounding ring of the low-conductivity electromagnetic flowmeter to the outlet of the conductive liquid water pipeline. In addition, the wall thickness of the support arm 4 is usually not greater than the wall thickness of the grounding outer ring 1; the above settings are prior art, and the number and setting method of the support arm 4 can be adaptively adjusted according to different working conditions, and the above application does not make too many restrictions.
[0035] In the present application, the outer diameter of the grounding outer ring 1 can be determined according to the size of the conductive liquid water pipeline. When the conductive liquid water pipeline is one of the DN25 pipelines, that is, a water pipeline with an outer diameter of 34mm and a wall thickness of 1.6mm, the outer diameter of the grounding outer ring is 30.8mm; when the conductive liquid water pipeline is a DN20 pipeline, that is, a water pipeline with an outer diameter of 27mm and a wall thickness of 1.6mm, the outer diameter of the grounding outer ring 1 is 23.8mm; through the above setting to ensure that the grounding ring of the low-conductivity electromagnetic flowmeter can be set close to the inner wall of the conductive liquid water pipeline, so the outer diameter of the grounding outer ring can be adjusted according to different specific working conditions, and the present application does not make too many restrictions here.
[0036] The following is a specific comparative experimental example of the present application and the prior art:
[0037] The same electromagnetic flowmeter is used to conduct the experiment with the same conductive liquid, wherein the conductive liquid has a conductivity lower than 5 μs / cm. When the conductive liquid flows through the conductive liquid water pipeline at a flow rate of 1 m / s, the conductive liquid is 3 / s, the zero drift fluctuation of the traditional grounding ring is about 30mm / s, while the zero drift fluctuation of the low conductivity electromagnetic flowmeter with the cross structure proposed in the present application is only 3mm / s, so the stability of the electromagnetic flowmeter is significantly improved.
[0038] In summary, in the utility model, a grounding ring for a low-conductivity electromagnetic flowmeter is proposed, which systematically solves the problem that when a traditional grounding ring is used to ground the conductive liquid in the electromagnetic flowmeter, the zero point drift is relatively serious, thereby causing a large detection error of the electromagnetic flowmeter, and avoids improving the grounding efficiency by extending the grounding ring in the direction of the water pipe to increase the contact area with the conductive liquid, thereby making the specific work more convenient and saving costs. Through the coordinated arrangement of the grounding inner ring 2, the grounding outer ring 1 and the connecting bridge 3, during the grounding process of the conductive liquid, the axial center of the conductive liquid water column in circulation can also be fully grounded, and the grounded water column is divided into multiple pieces, including a water column passing through the inner circle of the grounding inner ring 2 and a plurality of fan-shaped water columns passing through the grounding inner ring 2, the grounding outer ring 1 and each of the connecting bridges 3, so that the contact area between the detected liquid and the grounding ring of the low conductivity electromagnetic flowmeter when passing through the grounding ring of the low conductivity electromagnetic flowmeter is larger, thereby reducing the error of zero drift, thereby making the detection of the electromagnetic flowmeter more accurate. At the same time, this design effectively saves costs because it no longer needs to highly match the grounding ring of the low conductivity electromagnetic flowmeter with the pipeline of the conductive liquid.
[0039] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.
Claims
1. A grounding ring for a low conductivity electromagnetic flowmeter, characterized in that: include: Grounding outer ring, grounding inner ring and connecting bridge; The grounding outer ring is in the shape of a circular ring; The grounding inner ring is in a circular shape and is located inside the grounding outer ring; The connecting bridge is connected between the grounded inner ring and the grounded outer ring; There are a plurality of connecting bridges, and an annular area is provided between the outer wall of the grounded inner ring and the inner wall of the grounded outer ring. Each of the connecting bridges divides the annular area into a plurality of sector rings.
2. The grounding ring of a low conductivity electromagnetic flowmeter according to claim 1, characterized in that: The grounded outer ring and the grounded inner ring are coaxially arranged.
3. The grounding ring of a low conductivity electromagnetic flowmeter according to claim 1, characterized in that: There are four connecting bridges, one end of each connecting bridge is connected to the inner wall of the grounding outer ring, and the other end of each connecting bridge is connected to the outer wall of the grounding inner ring.
4. The grounding ring of a low conductivity electromagnetic flowmeter according to claim 3, characterized in that: Each of the connecting bridges is centrally symmetrically arranged with the central axis of the grounding inner ring as the center.
5. The grounding ring of a low conductivity electromagnetic flowmeter according to claim 1, characterized in that: The grounding outer ring, the grounding inner ring and the connecting bridges are integrally formed.
6. The grounding ring of a low conductivity electromagnetic flowmeter according to claim 1, characterized in that: The wall thickness of the grounding outer ring is 2-4 mm.
7. The grounding ring of a low conductivity electromagnetic flowmeter according to claim 1, characterized in that: The inner diameter of the grounding outer ring is 3-6 times the inner diameter of the grounding inner ring.
8. The grounding ring of a low conductivity electromagnetic flowmeter according to claim 1, characterized in that: The dimension of each of the connecting bridges along the circumferential direction of the grounding inner ring is no greater than 2 mm.
9. The grounding ring of a low conductivity electromagnetic flowmeter according to claim 1, characterized in that: The grounding ring of the low-conductivity electromagnetic flowmeter further comprises a support arm, which is arranged on the outer wall of the grounding outer ring and is used to fix the grounding ring of the low-conductivity electromagnetic flowmeter at the outlet of the conductive liquid pipeline.
10. An electromagnetic flowmeter, characterized in that: The electromagnetic flowmeter is installed with a grounding ring of a low-conductivity electromagnetic flowmeter as described in any one of claims 1 to 9.