Electromagnetic flowmeter

Abstract

The utility model provides an electromagnetic flowmeter, which relates to the technical field of flowmeters and comprises a converter, a sensor and a bridging sheet. The sensor comprises an electrical part, and the electrical part comprises an electrode. The converter comprises a main shell and a circuit board assembly, the circuit board assembly and the electrode are electrically connected with the first grounding body, and common ground of the circuit board assembly and the electrode is achieved; the main shell is provided with a shell grounding body, the shell grounding body is used for achieving grounding of the main shell, the bridging piece is used for connecting the circuit board assembly and the grounding end of the electrode with the shell grounding body, grounding is achieved through the shell grounding body, and the electrode and the wiring board are connected in a common-ground mode. Through the arrangement of the standby grounding body and the shell grounding body, when the grounding wire is in an open circuit state, the bridging piece can be installed after a risk occurs, grounding is achieved through the shell grounding body, the grounding wire which is sealed through glue pouring does not need to be maintained, and therefore common ground connection among an electrode, a center control board and a wiring board is rapidly recovered, and the rapid maintenance effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of flow meters, in particular to an electromagnetic flow meter. Background Art

[0002] For traditional electromagnetic flow meters, the central control board and the wiring board are both grounded through grounding wires. However, during actual use, there is a risk of breakage in the relatively long grounding wires. After such a risk occurs, the electrodes, the central control board, and the wiring board are not connected to the same ground, and there is a potential difference at the grounding point in the measurement circuit, resulting in errors. Since the circuit board needs to be waterproofed, usually by potting, it is difficult to replace or quickly replace the grounding wire. At this time, if repairs are to be made to the grounding wire, it takes a long time and it is impossible to quickly restore the common grounding connection among the electrodes, the central control board, and the wiring board. In view of the above defects, this application is proposed. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an electromagnetic flow meter, which can quickly restore the common grounding connection among the electrodes and the circuit board components by installing a bridging piece after the risk of breakage in the grounding wire occurs.

[0004] To solve the above problems, the utility model provides an electromagnetic flow meter, which includes a converter, a sensor, and a bridging piece. The bridging piece is not limited to a sheet structure and can also be a wire body, a block, etc.

[0005] The sensor includes an electrical part, and the electrical part includes electrodes. The electrodes are connected to a first grounding body and are grounded through the first grounding body.

[0006] The converter includes a main housing and a circuit board assembly. The circuit board assembly generally includes a central control board and / or a wiring board.

[0007] Further, the circuit board assembly includes a central control board and a wiring board. The wiring board is electrically connected to the central control board. The central control board is connected to a second grounding wire, and the second grounding wire is electrically connected to the first grounding body to realize the grounding of the central control board and the wiring board, and the central control board, the wiring board, and the electrodes share the same ground.

[0008] The grounding end of the wiring board is connected to a standby grounding body. A housing grounding body is provided on the main housing, and the housing grounding body is used to ground the main housing. The bridging piece is used to connect the standby grounding body and the housing grounding body. When the second grounding wire is broken, the bridging piece is installed, and the housing grounding body is used for grounding to restore the common grounding connection among the electrodes, the central control board, and the wiring board.

[0009] According to an embodiment of the utility model, the main housing is connected to a conductive column, and the bridging piece is used to connect the standby grounding body and the conductive column to connect the standby grounding body and the housing grounding body.

[0010] The conductive posts generally use conductive copper posts. Since the housing grounding body is arranged outside the main housing and it is not convenient to directly connect to the standby grounding body, by setting the conductive posts closer to the standby grounding body, the length of the bridging piece is reduced.

[0011] According to an embodiment of the present invention, the standby grounding body uses a first fastening screw, and the first fastening screw is the fastening screw between the wiring board and the main housing. A second fastening screw is installed at the conductive post, and the two fastening screws facilitate the fixation of the bridging piece.

[0012] According to an embodiment of the present invention, through holes are provided on the bridging piece for cooperating with screws for fastening.

[0013] According to an embodiment of the present invention, the housing grounding body is a grounding screw, and the grounding screw is threadedly connected to and electrically connected to the main housing. The screw form is convenient for wiring.

[0014] According to an embodiment of the present invention, a cover body is installed on the main housing, and the standby grounding body and the conductive post are arranged in the space formed by the main housing and the cover body.

[0015] According to an embodiment of the present invention, the sensor further includes a connection part. The sensor is connected to the converter through the connection part, and the cable in the sensor extends to the converter through the connection part.

[0016] According to an embodiment of the present invention, the main housing is further provided with a docking part. The connection part includes an insertion tube, and the docking part is in plug-in fit with the insertion tube. A limiting structure is provided on the insertion tube for playing a limiting role after the plug-in fit reaches a set length.

[0017] According to an embodiment of the present invention, the limiting structure includes a connection flange provided on the insertion tube. The diameter of the connection flange is larger than that of the insertion tube. A convex structure is provided on the connection flange. The docking part is a stepped hole, and the small-diameter section of the stepped hole communicates with the inner cavity of the main housing. The insertion tube is in plug-in fit with the small-diameter section of the stepped hole, and the convex structure on the connection flange is in plug-in fit with the large-diameter section of the stepped hole to achieve an anti-rotation effect.

[0018] According to an embodiment of the present invention, the converter further includes a dashboard and a tempered glass for observing the dashboard.

[0019] The beneficial effect of the present invention is that through the setting of the standby grounding body and the housing grounding body, when the grounding wire is open-circuited, the bridging piece can be installed after the risk occurs, and the housing grounding body realizes grounding. There is no need to repair the already potted and sealed grounding wire, so as to quickly restore the common grounding connection between the electrode, the central control board, and the wiring board, achieving a quick repair effect. Description of the Drawings

[0020] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 is a schematic diagram of the overall structure of an electromagnetic flowmeter;

[0022] Figure 2 is a cross-sectional view of the electromagnetic flowmeter;

[0023] Figure 3 is a schematic diagram of the structure without the installation of the bridging piece;

[0024] Figure 4 is a schematic diagram of the structure after the installation of the bridging piece;

[0025] Figure 5 is a schematic diagram of the bridging piece;

[0026] Figure 6 is a schematic diagram of the structure at the docking part and the insertion pipe in Embodiment 5. Specific embodiments

[0027] The following description is only used to disclose the present utility model so that those skilled in the art can implement the present utility model. The embodiments described below are only examples, and those skilled in the art can think of other obvious deformations. The basic principles defined in the following description can be applied to other implementation schemes, deformation schemes, improvement schemes, equivalent schemes, and other schemes that do not deviate from the spirit and scope of the present utility model.

[0028]

Embodiment 1

[0029] An electromagnetic flowmeter, as Figure 1 , includes a converter 1 and a sensor 2.

[0030] The converter 1 includes a first cover body 11, a main housing 12, and a second cover body 13.

[0031] The main housing 12 is threadedly connected to the first cover body 11 and the second cover body 13 respectively. The pitch S1 between the main housing 12 and the first cover body 11 is >= 0.7 mm, and the number of engaged thread turns N1 is >= 5.

[0032] The converter 1 further includes a dashboard 14, and the first cover body 11 is provided with tempered glass 111 for observing the dashboard 14.

[0033] Specifically, the first cover body 11 is provided with a glass installation cavity, the tempered glass 111 is disposed in the glass installation cavity, and the gap between the inner wall of the glass installation cavity and the tempered glass 111 is filled with sealant. The length L of the bonding joint surface formed by the sealant is not less than 10 mm, so as to meet the requirements of explosion-proof performance.

[0034] Further, a glass pressing ring is provided on the first cover body 11. The glass pressing ring is in close contact with the inner wall of the glass installation cavity and is also in close contact with the tempered glass 111, further ensuring the fixing and sealing effects of the tempered glass 111.

[0035] The dashboard further includes several groups of infrared touch modules. Each group of infrared touch modules includes a transmitting unit and a receiving unit. The transmitting unit can adopt an infrared light-emitting diode, and the corresponding receiving unit adopts an infrared receiving diode.

[0036] Such as Figure 1 , the sensor 2 includes an electrical part 21, a pipeline part 22, a flange 23 and a connecting part 24. The flange 23 is used to connect with the pipeline through which the fluid to be measured flows. The electrical part 21 is sleeved on the pipeline part 22, and the fluid to be measured flows through the pipeline part 22. The connecting part 24 is fixedly connected to the electrical part 21. The wires of the coils and electrodes included in the electrical part 21 pass through the connecting part. The flow detection of the electromagnetic flowmeter in this solution is the same as that of the traditional electromagnetic flowmeter, and the specific detection principle will not be elaborated here.

[0037] The main housing 12 further includes a docking part 121. The connecting part 24 includes an insertion pipe 241. The docking part 121 is inserted and matched with the insertion pipe 241 and is fixedly connected by bolts.

[0038] The electrical part 21 includes an exciting coil 211 and electrodes 212. The electrodes 212 are provided with a first grounding body and are grounded through the first grounding body. The converter 1 further includes a central control board and a wiring board. Both the central control board and the wiring board are existing structures in the electromagnetic flowmeter. The wiring board is electrically connected to the central control board. The central control board is also provided with a second grounding wire, and the second grounding wire is electrically connected to the first grounding body, thereby realizing the grounding of the central control board and the wiring board, and the central control board, the wiring board and the electrodes share the same ground. The wiring board is arranged at one end of the main housing 12 relatively close to the second cover body 13 and is fixedly connected to the main housing 12.

[0039] The main housing 12 is made of metal, which can be entirely made of metal or partially made of metal, as long as it meets the conductive requirements of the housing grounding body. The main housing 12 is provided with a grounding screw 122, and the grounding screw 122 constitutes the housing grounding body. In other embodiments, other structures can also be selected to achieve grounding. The setting in the form of the grounding screw 122 is convenient for wiring; the grounding screw 122 is threadedly connected to the main housing 12.

[0040] Such as Figure 3 , a first fastening screw 3 is provided between the wiring board and the main housing 12. The first fastening screw 3 constitutes a spare grounding body. Similarly, other conductive structures can also be selected. The setting in the form of a screw is convenient for connecting the bridging piece 5. The first fastening screw 3 is electrically connected to the grounding end of the wiring board. The number of screws between the wiring board and the main housing 12 can be set in several groups, but only one screw electrically connected to the grounding end of the wiring board needs to be set.

[0041] The main housing 12 is also provided with a conductive post 4. The conductive post 4 is threadedly connected to and electrically connected to the main housing 12. The conductive post 4 is made of a conductive copper post and is installed with a second fastening screw. A detachable bridging piece 5 is provided between the conductive post 4 and the fastening screw 3, and the bridging piece is electrically connected to both the conductive post 4 and the fastening screw 3.

[0042] The bridging piece 5 is as Figure 5 shown. Two through holes are provided on the bridging piece for cooperating with the first fastening screw and the second fastening screw.

[0043] Since both the central control board and the wiring board are grounded through the second grounding wire, but in the actual use process, there is a risk of breakage in the relatively long second grounding wire. Therefore, after the risk occurs, the bridging piece 5 can be installed between the conductive post 4 and the first fastening bolt 3, as Figure 4 ( Figure 3 , Figure 4 the second cover 13 is hidden in the figure), and then the grounding is realized by the grounding screw 122, so as to restore the common grounding connection between the electrode, the central control board and the wiring board, reduce the error caused by the potential difference at the grounding point in the measurement circuit, and improve the accuracy of the electromagnetic flowmeter.

[0044] Before the risk occurs, the bridging piece 5 is not installed. After the risk occurs, it is completed by the maintenance personnel for separate installation. Thus, there is no need to repair the already potted and sealed grounding wire. The bridging piece is used to quickly restore the common grounding connection between the electrode, the central control board and the wiring board, reduce the error caused by the potential difference at the grounding point in the measurement circuit, and improve the accuracy of the electromagnetic flowmeter.

[0045]

Embodiment 2

[0046] On the basis of Embodiment 1, as Figure 6 shown, a stepped hole is formed in the docking part 121. The small-diameter section 1212 of the stepped hole communicates with the inner cavity of the main housing. The axes of the small-diameter section 1212 and the large-diameter section 1211 are collinear. A connecting flange 242 is provided on the insertion pipe 241, and the connecting flange 242 and the insertion pipe are an integral part or fixedly connected.

[0047] The outer circumferential surface of the insertion pipe 241 and the inner circumferential surface of the small-diameter section 1212 together form a cylindrical explosion-proof joint surface between the main housing 12 and the connecting part 24. An O-ring groove is formed on the end surface of the large-diameter section 1211 of the stepped hole, and an O-ring is also provided in the O-ring groove. The O-ring abuts against the connecting flange 242 to achieve a sealing effect, and the main housing 12 and the connecting part 24 are fixedly connected by bolts.

[0048] Preferably, the length of the insertion pipe and the length of the insertion pipe cooperating with the small-diameter section 1212 are both not less than 12.5 mm to ensure the explosion-proof performance of the instrument.

[0049] Those skilled in the art should understand that the above description and the embodiments of the present invention shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been completely and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention can have any deformations and modifications without departing from the above principles.

Claims

1. An electromagnetic flowmeter, characterized in that: It includes a converter (1), a sensor (2) and a bridging piece (5); The sensor (2) includes an electrical part (21), and the electrical part (21) includes electrodes (212); The converter (1) includes a main housing (12) and a circuit board assembly. The circuit board assembly and the electrodes (212) are both electrically connected to a first grounding body, so that the circuit board assembly and the electrodes (212) share the same ground; The main housing (12) is provided with a housing grounding body for grounding the main housing (12). The bridging piece (5) is detachably connected to the main housing (12), and the bridging piece (5) is detachably connected to the circuit board assembly.

2. The electromagnetic flowmeter according to claim 1, wherein: A first fastening screw (3) is provided between the circuit board assembly and the bridging piece (5). The bridging piece (5) is electrically connected to the grounding end of the circuit board assembly. A conductive post (4) electrically connected to the housing grounding body is installed on the main housing (12). The conductive post (4) is provided with a second fastening screw. The second fastening screw penetrates through the conductive post (4) and the bridging piece (5). The second fastening screw is threadedly connected to the main housing (12). The bridging piece (5) is used to connect the first fastening screw (3) and the conductive post (4) to connect the first fastening screw (3) to the housing grounding body.

3. The electromagnetic flowmeter according to claim 1 or 2, characterized in that: The housing grounding body is a grounding screw (122), and the grounding screw (122) is threadedly connected to and electrically connected to the main housing (12).

4. The electromagnetic flowmeter according to claim 2, wherein: A cover body is installed on the main housing (12), and the first fastening screw (3) and the conductive post (4) are arranged in the space formed by the main housing (12) and the cover body.

5. The electromagnetic flowmeter according to claim 1, characterized in that: The sensor (2) further includes a connecting part (24). The sensor (2) is connected to the converter (1) through the connecting part (24), and the cable in the sensor (2) extends to the converter (1) through the connecting part (24).

6. The electromagnetic flowmeter according to claim 5, characterized in that: The main housing (12) is further provided with a docking part (121). The connecting part (24) includes an insertion pipe (241). The docking part (121) is in plug-in fit with the insertion pipe (241). The insertion pipe (241) is provided with a connecting flange (242) for playing a limiting role after the plug-in fit reaches a set length.

7. The electromagnetic flowmeter according to claim 1, characterized in that: The converter (1) further includes a dashboard (14) and a toughened glass (111) for observing the dashboard (14). The converter (1) is provided with a glass installation cavity. The toughened glass (111) is arranged in the glass installation cavity, and a sealant is filled between the inner wall of the glass installation cavity and the toughened glass (111).

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