Electromagnetic flowmeter

Abstract

The utility model provides an electromagnetic flow meter which comprises a flow meter pipeline, a transmitter is installed on the upper portion of the outer surface of the flow meter pipeline through a connecting piece, end covers are welded to the two ends of the flow meter pipeline respectively, a grounding ring is arranged on the face, facing the flow meter pipeline, of each end cover, two small holes are formed in one face of each grounding ring, and the two small holes are communicated with the flow meter pipeline. Two through holes aligned with the small holes are formed in the area, covered by the grounding ring, of the end cover, positioning sleeves are arranged on the sides, away from the small holes, of the through holes, inserting columns are inserted into the positioning sleeves, screw holes aligned with the through holes are formed in one faces of the inserting columns, and glands are fixedly connected to the ends, away from the through holes, of the inserting columns. The electromagnetic flowmeter grounding ring has the advantages that the grounding ring is installed inside the electromagnetic flowmeter, no leakage point exists at the installation position of the grounding ring, and the requirement for installation and sealing of the electromagnetic flowmeter is lowered.

Description

TECHNICAL FIELD

[0001] The utility model relates to an electromagnetic flowmeter and belongs to the field of flowmeters. BACKGROUND

[0002] Electromagnetic flowmeters are widely used in industries such as chemical, petroleum, metallurgy, water treatment, food and beverage, and pharmaceutical, to accurately measure and control the flow of liquids. When an electrically conductive medium (liquid) flows through a measuring tube placed in a magnetic field, the flowing liquid behaves like a conductor moving in a magnetic field, cutting magnetic lines of force. According to the principle of electromagnetic induction, an induced potential will be generated on two detection electrodes, and the magnitude of this potential is directly proportional to the speed of the fluid. By measuring this induced potential, the volumetric flow rate of the fluid flowing through the pipe can be calculated. Grounding of the electromagnetic flowmeter is very important, as it directly affects the accuracy of the measurement and the safety of the instrument. Grounding can help eliminate electromagnetic interference, which can come from the electromagnetic fields of surrounding equipment or static electricity generated by the fluid flowing in the pipe itself. Good grounding ensures the purity of the measurement signal and prevents false measurements.

[0003] Currently, the grounding ring on the electromagnetic flowmeter is generally installed on the flange end face of the electromagnetic flowmeter at both ends of the electromagnetic flowmeter pipeline. After the flange on the electromagnetic flowmeter is connected to the flange on the liquid conveying pipeline using bolts, the grounding ring is located between the two flanges. At this time, there are two contact surfaces between the grounding ring and the two flanges. Since there are two flanges on the electromagnetic flowmeter, after installing the grounding ring at both ends of the electromagnetic flowmeter, four leakage points are formed at the installation positions of the two grounding rings. The sealing requirements for the installation of the electromagnetic flowmeter are high, so a kind of electromagnetic flowmeter that reduces the sealing requirements for installation needs to be designed. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model aims to provide an electromagnetic flowmeter to solve the problems raised in the background art. The utility model realizes the installation of the grounding ring inside the electromagnetic flowmeter, eliminates leakage points at the installation position of the grounding ring, and reduces the sealing requirements for the installation of the electromagnetic flowmeter.

[0005] In order to achieve the above object, the utility model is through the following technical scheme to realize: a electromagnetic flowmeter, including flowmeter pipeline, the upper position on the outer surface of flowmeter pipeline is equipped with transmitter through connecting piece, the outer surface of transmitter is equipped with two threading hole, both ends of flowmeter pipeline are welded with end cover, one side of end cover face to flowmeter pipeline is equipped with grounding ring, one side of grounding ring is equipped with two small holes, the area of end cover covered by grounding ring is equipped with two through holes which are aligned with small holes, one side of through hole away from small hole is equipped with positioning sleeve, one end of positioning sleeve is connected with end cover and is fixed, the positioning sleeve is inserted with plug post, one side of plug post is equipped with screw hole which is aligned with through hole, the end of plug post away from through hole extends to the outside of positioning sleeve, the end of plug post away from through hole is connected with gland and is fixed, the sealing ring is equipped between gland and positioning sleeve, the sealing ring is set on plug post, the connecting screw is inserted in the channel formed by small hole and through hole, one end of connecting screw is screwed in screw hole.

[0006] Further, the cross section of the plug post is rectangular, and the cross section of the positioning sleeve is rectangular.

[0007] Further, the connecting piece comprises a connecting pipe, the upper position of the outer surface of the flowmeter pipeline is provided with the connecting pipe, the upper end of the connecting pipe is provided with a connecting disc connected and fixed with the connecting pipe, the lower position of the outer surface of the transmitter is provided with a boss, the connecting disc is connected with the boss through a plurality of positioning screws, and a sealing gasket is arranged between the connecting disc and the boss.

[0008] Further, one side of the connecting disc away from the boss is provided with a supporting disc for limiting the head position of the positioning screw, a gap exists between the supporting disc and the connecting disc, and one end of the positioning screw is sequentially threaded through the hole in the supporting disc and the hole in the connecting disc and then screwed into the threaded hole in the boss.

[0009] Further, the middle position of one side of the end cover away from the flowmeter pipeline is provided with a pipe joint, and the end of the pipe joint away from the end cover is provided with a flange connected and fixed with the pipe joint.

[0010] Further, the plug post and the gland are in an integral molding structure, and the cross section of the gland is rectangular.

[0011] The utility model has the advantages of:

[0012] 1. The grounding ring is installed on one side of the end cover facing the flowmeter pipeline, and then the end cover is welded at the end of the flowmeter pipeline, so that the grounding ring is in the space formed by the end cover and the flowmeter pipeline, the grounding wire connected to the grounding ring is introduced through the threading hole on the transmitter, the grounding ring is installed inside the electromagnetic flowmeter, there is no leakage point at the grounding ring installation position, and the requirement for the sealing of the electromagnetic flowmeter installation is reduced.

[0013] 2、welding end cover and flowmeter pipeline, the processing of threaded hole is inserted into the positioning sleeve, the plug column and the end cover are assembled, then the connecting screw is screwed into the threaded hole through the channel formed by the small hole and the hole, at this time the gland and the positioning sleeve work together to extrude the sealing ring, improve the sealing between the plug column and the positioning sleeve, at the same time, the grounding ring and the end cover are assembled, without processing threaded hole on the end cover matched with the connecting screw, which is beneficial to reduce the wall thickness of the end cover, when the thread in the threaded hole is damaged, the plug column can be replaced alone, compared with replacing the entire end cover when the threaded hole is damaged, the cost of replacing parts is reduced.

[0014] 3、when the transmitter is installed on the flowmeter pipeline by using the positioning screw, the positioning screw is threaded through the support disc and the connecting disc in turn and is screwed with the boss, at this time, under the limitation of the support disc, there is a gap between the head of the positioning screw and the connecting disc, when the transmitter is damaged and needs to be replaced, and the positioning screw is difficult to be removed by using conventional means, the positioning screw can be cut off by using the gap between the support disc and the connecting disc, which provides a backup mode for removing the damaged transmitter. BRIEF DESCRIPTION OF DRAWINGS

[0015] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the following drawings:

[0016] Figure 1 It is a structural schematic view of the electromagnetic flowmeter of the present application;

[0017] Figure 2 It is another perspective view of the electromagnetic flowmeter of the present application;

[0018] Figure 3 It is an assembly schematic view of the grounding ring, flange and end cover in the electromagnetic flowmeter of the present application;

[0019] Figure 4 It is an assembly sectional view of the grounding ring, connecting screw and end cover in the electromagnetic flowmeter of the present application;

[0020] Figure 5 It is Figure 4 the enlarged view of A in the middle;

[0021] Figure 6 It is an assembly schematic view of the positioning sleeve and end cover in the electromagnetic flowmeter of the present application;

[0022] Figure 7 It is a perspective view of the grounding ring in the electromagnetic flowmeter of the present application;

[0023] Figure 8 It is an assembly schematic view of the gland, sealing ring and plug column in the electromagnetic flowmeter of the present application;

[0024] In the figure: 1-flow meter pipe, 2-positioning sleeve, 3-gland, 4-flange, 5-end cover, 6-threading hole, 7-transmitter, 8-boss, 9-pipe joint, 10-connecting pipe, 11-sealing gasket, 12-connection disc, 13-positioning screw, 14-supporting disc, 15-ground ring, 16-connecting screw, 17-sealing ring, 18-inserting post, 19-screw hole. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0026] Please refer to Figure 1 and Figure 2 , the utility model provides a technical scheme: a kind of electromagnetic flowmeter, including flow meter pipe 1, connecting pipe 10 is installed on the outer surface upper position of flow meter pipe 1, flange 4 is fixedly connected with connecting pipe 10 on the upper end of connecting pipe 10 and is sleeved, two threading holes 6 are installed on the outer surface of transmitter 7 lower position, the both ends of flow meter pipe 1 are welded with end cover 5, the side of end cover 5 towards flow meter pipe 1 is equipped with ground ring 15, so that ground ring 15 is installed on the side of end cover 5 towards flow meter pipe 1, then end cover 5 is welded in the end of flow meter pipe 1, at this time, ground ring 15 is in the space formed by end cover 5 and flow meter pipe 1, so that the ground wire connected on ground ring 15 is introduced through threading hole 6 on transmitter 7, realize that ground ring 15 is installed in electromagnetic flowmeter, so that the installation part of ground ring 15 has no leakage point, reduce the requirement to electromagnetic flowmeter installation seal.

[0027] Please refer to Figure 1 , Figure 2 and Figure 7 , pipe joint 9 is installed in the middle position of the side of end cover 5 away from flow meter pipe 1, flange 4 is fixedly connected with pipe joint 9 on the end of pipe joint 9 away from end cover 5 and is sleeved, two threading holes 6 are installed on the outer surface of transmitter 7, the both ends of flow meter pipe 1 are welded with end cover 5, the side of end cover 5 towards flow meter pipe 1 is equipped with ground ring 15, so that ground ring 15 is installed on the side of end cover 5 towards flow meter pipe 1, then end cover 5 is welded in the end of flow meter pipe 1, at this time, ground ring 15 is in the space formed by end cover 5 and flow meter pipe 1, so that the ground wire connected on ground ring 15 is introduced through threading hole 6 on transmitter 7, realize that ground ring 15 is installed in electromagnetic flowmeter, so that the installation part of ground ring 15 has no leakage point, reduce the requirement to electromagnetic flowmeter installation seal.

[0028] Referring to Figures 1-8 The grounding ring 15 is provided with two small holes on one side, and the area covered by the grounding ring 15 on the end cover 5 is provided with two through holes aligned with the small holes. The through holes are provided with a positioning sleeve 2 with a rectangular cross section on the side away from the small holes. One end of the positioning sleeve 2 is connected and fixed with the end cover 5. A plug column 18 with a rectangular cross section is inserted into the positioning sleeve 2. The plug column 18 is provided with a threaded hole 19 aligned with the through hole on one side. The end of the plug column 18 away from the through hole extends to the outside of the positioning sleeve 2. The end of the plug column 18 away from the through hole is connected and fixed with a gland 3 with a rectangular cross section. The plug column 18 and the gland 3 are an integral structure. A sealing ring 17 is arranged between the gland 3 and the positioning sleeve 2. The sealing ring 17 is sleeved on the plug column 18. A connecting screw 16 is inserted into the channel formed by the small hole and the through hole. One end of the connecting screw 16 is screwed into the threaded hole 19. The end cover 5 is welded to the front of the flowmeter pipeline 1. The plug column 18 with the threaded hole 19 is inserted into the positioning sleeve 2. The plug column 18 and the end cover 5 are assembled. Then the connecting screw 16 is screwed into the threaded hole 19 through the channel formed by the small hole and the through hole. At this time, the gland 3 and the positioning sleeve 2 jointly extrude the sealing ring 17 to improve the sealing between the plug column 18 and the positioning sleeve 2. At the same time, the assembly of the grounding ring 15 and the end cover 5 is completed. There is no need to process the threaded hole 19 matched with the connecting screw 16 on the end cover 5. This is conducive to reducing the wall thickness of the end cover 5. When the threads in the threaded hole 19 are damaged, the plug column 18 can be replaced alone. Compared with replacing the entire end cover 5 when the threaded hole 19 is damaged, the replacement cost of parts is reduced.

[0029] Although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. The description of the specification is only for the sake of clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can be combined appropriately to form other embodiments that can be understood by those skilled in the art.

Claims

1. An electromagnetic flowmeter comprising a flowmeter conduit (1), characterised in that: The flowmeter pipeline (1) is provided with a transmitter (7) on the upper part of the outer surface of the flowmeter pipeline (1) through a connecting piece, the outer surface of the transmitter (7) is provided with two wire-through openings (6), both ends of the flowmeter pipeline (1) are welded with end covers (5), one side of the end cover (5) facing the flowmeter pipeline (1) is provided with a grounding ring (15), one side of the grounding ring (15) is provided with two small holes, the area of the end cover (5) covered by the grounding ring (15) is provided with two through holes aligned with the small holes, one side of the through hole away from the small hole is provided with a positioning sleeve (2), one end of the positioning sleeve (2) is connected and fixed with the end cover (5), the positioning sleeve (2) is provided with a plug column (18), one side of the plug column (18) is provided with a screw hole (19) aligned with the through hole, the end of the plug column (18) away from the through hole extends to the outside of the positioning sleeve (2), the end of the plug column (18) away from the through hole is connected and fixed with a gland (3), a sealing ring (17) is arranged between the gland (3) and the positioning sleeve (2), the sealing ring (17) is arranged on the plug column (18), the connecting screw (16) is arranged in the channel formed by the small hole and the through hole.

2. An electromagnetic flowmeter according to claim 1, characterised in that: The cross section of the plug column (18) is rectangular, and the cross section of the positioning sleeve (2) is rectangular.

3. An electromagnetic flowmeter according to claim 1, wherein: The connecting piece comprises a connecting pipe (10), the connecting pipe (10) is arranged on the upper part of the outer surface of the flowmeter pipeline (1), the upper end of the connecting pipe (10) is provided with a connecting disc (12) connected and fixed with the connecting pipe (10), the outer surface of the lower part of the transmitter (7) is provided with a boss (8), the connecting disc (12) is connected with the boss (8) through a plurality of positioning screws (13), and a sealing gasket (11) is arranged between the connecting disc (12) and the boss (8).

4. An electromagnetic flowmeter according to claim 3, characterised in that: The side of the connecting disc (12) away from the boss (8) is provided with a support disc (14) for limiting the head position of the positioning screw (13), there is a gap between the support disc (14) and the connecting disc (12), and one end of the positioning screw (13) is sequentially threaded through the hole in the support disc (14) and the hole in the connecting disc (12) and then is screwed into the threaded hole in the boss (8).

5. An electromagnetic flowmeter according to claim 1, wherein: The middle part of one side of the end cover (5) away from the flowmeter pipeline (1) is provided with a pipe joint (9), and the end of the pipe joint (9) away from the end cover (5) is provided with a flange (4) connected and fixed with the pipe joint (9).

6. An electromagnetic flowmeter according to claim 1, wherein: The plug column (18) and the gland (3) are an integral structure, and the cross section of the gland (3) is rectangular.

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