Electromagnetic flowmeter with alarm function

Abstract

The utility model discloses a kind of electromagnetic flowmeter with alarm function, it is related to electromagnetic flowmeter technical field, including electromagnetic flowmeter main part and measuring conduit, electromagnetic flowmeter main part is fixedly connected on the outer wall of measuring conduit.The utility model is driven floating hemisphere and annular block motion by the change of liquid flow using upper and lower limit alarm mechanism, and when annular block upward and first mechanical microswitch contact, trigger upper limit flow alarm, or when annular block bottom end and second mechanical microswitch contact, trigger lower limit flow alarm, promote pump, mixer and other equipment to stop machine protection, avoid causing pipeline pressure too large and equipment overload operation or equipment idling, wear and tear even damage risk;By threshold adjusting mechanism can drive first mechanical microswitch and second mechanical microswitch to carry out the up-and-down movement of adaptation, so as to carry out the up-and-down limit threshold adjustment of adaptation according to its use requirement, adapt to different working conditions and demand.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic flowmeter technology, and in particular relates to an electromagnetic flowmeter with an alarm function. Background Technology

[0002] An electromagnetic flowmeter is an instrument used to measure the flow rate of conductive liquids. It determines the flow rate by detecting the induced electromotive force generated when the liquid cuts magnetic lines of force in a magnetic field. It offers advantages such as high accuracy, high reliability, and no pressure loss, making it suitable for various industrial applications.

[0003] For example, the electromagnetic flowmeter proposed in announcement number CN210638746U includes a main pipe, a cover plate, and an electromagnetic flow sensor. The main pipe has an opening that communicates with the inner cavity of the main pipe. The cover plate is detachably installed at the opening. The electromagnetic flow sensor is installed on the cover plate and extends into the inner cavity of the main pipe to measure the fluid flow rate. In the technical solution provided by this utility model, the main pipe can be configured with an interface according to the interface form in the actual pipeline to connect the main pipe to the pipe network. The electromagnetic flowmeter provided by this utility model is manufactured as a whole in the factory, requiring no on-site calibration after installation. Furthermore, the electromagnetic flow sensor and the main pipe are detachably installed, achieving electromechanical separation and making the initial construction and subsequent maintenance of the entire device more convenient.

[0004] The above-mentioned patent has the following defects in use:

[0005] In applications such as pumps and agitators, during the flow and transportation of conductive liquids, the liquid flow rate may sometimes exceed the preset safety range, falling below the lower limit or exceeding the upper limit. The aforementioned electromagnetic flowmeters are unable to effectively monitor whether the fluid flow rate is within the preset safety range in real time during the flow measurement process. This can lead to equipment running dry, wearing out, or even being damaged when the flow rate is too low. When the flow rate exceeds the set upper limit, it can easily cause excessive pipeline pressure and equipment overload. Therefore, this utility model proposes an electromagnetic flowmeter with an alarm function. Utility Model Content

[0006] This invention provides an electromagnetic flowmeter with an alarm function. Through an upper and lower limit alarm mechanism, changes in liquid flow rate drive the movement of a floating hemisphere and an annular block. When the annular block contacts a first mechanical microswitch upwards, an upper limit flow alarm is triggered; or when the bottom of the annular block contacts a second mechanical microswitch, a lower limit flow alarm is triggered. This prompts pumps, agitators, and other equipment to shut down for protection, preventing excessive pipeline pressure, equipment overload, idling, wear, or even damage. A threshold adjustment mechanism allows the first and second mechanical microswitches to move up and down in accordance with their respective requirements, enabling appropriate upper and lower limit threshold adjustments to suit different operating conditions and needs. In summary, this invention solves the problems in the prior art.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] This utility model discloses an electromagnetic flowmeter with an alarm function, comprising:

[0009] The electromagnetic flowmeter body and the measuring conduit are provided. The electromagnetic flowmeter body is fixedly connected to the outer wall of the measuring conduit. A pair of terminals are fixedly connected to one side of the electromagnetic flowmeter body. Flanges are fitted onto the outer wall of the measuring conduit near both ends. A connecting top pipe is fixedly connected to the top of the measuring conduit, and a transparent sealing cylinder is fixedly connected to the top of the connecting top pipe.

[0010] An upper and lower limit alarm mechanism is provided between the connecting top pipe and the transparent sealing cylinder, and the upper and lower limit alarm mechanism is used to monitor abnormal flow rates and trigger an alarm.

[0011] A threshold adjustment mechanism is disposed inside a transparent sealed cylinder and is used to adjust the upper and lower threshold values.

[0012] The upper and lower limit alarm mechanism includes a floating hemisphere located inside the connecting top pipe. A pair of movable rods are fixedly connected to the top of the floating hemisphere. A pair of through holes are drilled at the bottom of the transparent sealing cylinder, and the top of the movable rods passes through the through holes and extends into the transparent sealing cylinder. A central rod is fixedly connected between the inner walls of the transparent sealing cylinder, and an annular block is fitted on the outer wall of the central rod. Connecting blocks are fixedly connected between the outer wall of the annular block and the outer walls of the pair of movable rods. A pair of rectangular movable blocks arranged vertically are fitted on the outer wall of the central rod. A first mechanical micro switch is fixedly connected to the bottom of the top rectangular movable block, and a second mechanical micro switch is fixedly connected to the top of the bottom rectangular movable block. The first and second mechanical micro switches are located at the top and bottom of the annular block, respectively.

[0013] Furthermore, when the top of the annular block comes into contact with the first mechanical micro switch, an upper limit flow alarm is triggered, and when the bottom of the annular block comes into contact with the second mechanical micro switch, a lower limit flow alarm is triggered.

[0014] Furthermore, a circular hole is drilled between the top and bottom ends of each pair of rectangular movable blocks, and each pair of rectangular movable blocks is fitted onto the outer wall of the central rod through the circular hole.

[0015] Furthermore, the outer wall of the floating hemisphere is fitted with an annular scraper, and the outer wall of the annular scraper is in contact with the inner wall of the connecting jacking pipe.

[0016] Furthermore, a sealing ring is fixedly connected to the inner wall of each pair of through holes, and the inner wall of the sealing ring is in close contact with the outer wall of the movable rod.

[0017] Furthermore, the threshold adjustment mechanism includes a pair of lead screws, each of which is rotatably connected to the bottom and top of the transparent sealing cylinder via bearings. The rectangular movable block at the top is threadedly connected to the lead screw on one side, and the rectangular movable block at the bottom is threadedly connected to the lead screw on the other side. A rotating circular block is fixedly connected to the top of each of the lead screws.

[0018] Furthermore, threaded through holes are drilled between the top and bottom ends of each pair of rectangular movable blocks, and the rectangular movable blocks are sleeved on the outer wall of the lead screw through the threaded through holes and threadedly connected to it.

[0019] The present invention has the following advantages over the prior art:

[0020] 1. This technical solution uses an upper and lower limit alarm mechanism to drive the floating hemisphere to move up and down by changes in liquid flow rate. This causes the hemisphere to move up and down along the central rod. When the hemisphere contacts the first mechanical micro switch at the top, it triggers the upper limit flow alarm. Or when the bottom of the hemisphere contacts the second mechanical micro switch, it triggers the lower limit flow alarm. This causes the pump, agitator and other equipment to shut down for protection, avoiding the risk of excessive pipeline pressure, equipment overload operation or equipment idling, wear or even damage.

[0021] 2. This technical solution uses a threshold adjustment mechanism to rotate the lead screws on both sides to drive the first and second mechanical micro switches to move up and down in a corresponding manner, so as to adjust the upper and lower thresholds according to the usage requirements and adapt to different working conditions and needs.

[0022] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of an electromagnetic flowmeter with an alarm function according to the present invention;

[0025] Figure 2 This is a partial cross-sectional structural diagram of an electromagnetic flowmeter with alarm function according to the present invention;

[0026] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A;

[0027] Figure 4 This utility model Figure 2 Enlarged structural diagram at point B;

[0028] Figure 5 This is a partial cross-sectional structural diagram of the transparent sealing cylinder, the upper and lower limit alarm mechanism, and the threshold adjustment mechanism in this utility model.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Electromagnetic flowmeter body; 2. Measuring guide tube; 3. Flange; 4. Terminal; 5. Connecting jacking pipe; 6. Transparent sealing cylinder; 7. Upper and lower limit alarm mechanism; 701. Floating hemisphere; 702. Movable rod; 703. Annular block; 704. Connecting block; 705. Rectangular movable block; 706. First mechanical micro switch; 707. Second mechanical micro switch; 8. Annular scraper; 9. Sealing ring; 10. Threshold adjustment mechanism; 1001. Lead screw; 1002. Threaded through hole; 1003. Rotating block; 11. Center rod. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0032] In the description of this utility model, it should be understood that the terms "relative", "one end", "inner", "lateral", "end", "both ends", "both sides", "front", "one end face", "the other end face", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Specific Implementation Example 1:

[0034] Please see Figures 1-5 As shown, an electromagnetic flowmeter with an alarm function according to this utility model includes:

[0035] The electromagnetic flowmeter body 1 and the measuring conduit 2 are fixedly connected to the outer wall of the measuring conduit 2. A pair of terminals 4 are fixedly connected to one side of the electromagnetic flowmeter body 1. Flanges 3 are fitted onto the outer wall of the measuring conduit 2 near both ends. A connecting top pipe 5 is fixedly connected to the top of the measuring conduit 2, and a transparent sealing cylinder 6 is fixedly connected to the top of the connecting top pipe 5.

[0036] Upper and lower limit alarm mechanism 7 is installed between the connecting top pipe 5 and the transparent sealing cylinder 6, and is used to monitor abnormal flow rates and trigger an alarm.

[0037] Threshold adjustment mechanism 10 is disposed inside the transparent sealed cylinder 6 and is used to adjust the upper and lower thresholds.

[0038] The upper and lower limit alarm mechanism 7 includes a floating hemisphere 701 located inside the connecting top pipe 5. A pair of movable rods 702 are fixedly connected to the top of the floating hemisphere 701. A pair of through holes are drilled at the bottom of the transparent sealing cylinder 6, and the top of the movable rods 702 passes through the through holes and extends into the transparent sealing cylinder 6. A central rod 11 is fixedly connected between the inner walls of the transparent sealing cylinder 6, and an annular block 703 is sleeved on the outer wall of the central rod 11. A connecting block 704 is fixedly connected between the outer wall of the annular block 703 and the outer wall of the pair of movable rods 702. A pair of rectangular movable blocks 705 arranged vertically are sleeved on the outer wall of the central rod 11. A first mechanical micro switch 706 is fixedly connected to the bottom of the rectangular movable block 705 located at the top, and a second mechanical micro switch 707 is fixedly connected to the top of the rectangular movable block 705 located at the bottom. The first mechanical micro switch 706 and the second mechanical micro switch 707 are located at the top and bottom of the annular block 703, respectively.

[0039] In the specific implementation process, firstly, the positions of the first mechanical micro switch 706 and the second mechanical micro switch 707 are adjusted and fixed at the corresponding heights, and their upper and lower limit thresholds are set. Then, when the liquid flows through the measuring conduit 2, the electromagnetic flowmeter body 1 measures its flow rate. At the same time, the floating hemisphere 701 is affected by the flow rate change during the liquid flow process and floats up and down accordingly. When the flow rate is too high, the floating hemisphere 701 floats upward, and through a pair of movable rods 702, it drives the annular block 703 to move upward along the central rod 11. When it contacts the first mechanical micro switch 706, the upper limit flow alarm is triggered. 06 is electrically connected to an external main controller, providing feedback to the external main controller so that it can shut down equipment such as pumps and agitators for protection, preventing excessive pipeline pressure and equipment overload. When the flow rate is too low, the buoyancy of the liquid on the floating hemisphere 701 decreases, causing the floating hemisphere 701 to move downward under gravity. This movement is then driven by a pair of movable rods 702 to move the annular block 703 downward along the central rod 11. When it comes into contact with the second mechanical micro switch 707, it triggers a lower limit flow alarm, which is then fed back to the external main controller, causing it to shut down equipment such as pumps and agitators for protection, preventing the risk of equipment running dry, wear, or even damage.

[0040] When the top of the annular block 703 contacts the first mechanical micro switch 706, an upper limit flow alarm is triggered, and when the bottom of the annular block 703 contacts the second mechanical micro switch 707, a lower limit flow alarm is triggered.

[0041] Both the first mechanical micro switch 706 and the second mechanical micro switch 707 are switching devices that achieve circuit switching through minute mechanical movements. Their core features include small contact spacing, short travel, low actuation force, and rapid switching. When the top of the annular block 703 contacts the first mechanical micro switch 706, pressing the button on the first mechanical micro switch 706 triggers the upper limit flow alarm. When the bottom of the annular block 703 contacts the second mechanical micro switch 707, pressing the button on the second mechanical micro switch 707 triggers the lower limit flow alarm and feeds back to the external main controller to enable the pump, agitator, and other equipment to shut down for protection.

[0042] Among them, a pair of rectangular movable blocks 705 have round holes drilled between their top and bottom ends, and the pair of rectangular movable blocks 705 are fitted onto the outer wall of the central rod 11 through the round holes.

[0043] The circular hole allows the rectangular movable block 705 to be fitted onto the outer wall of the central rod 11 and move up and down along the central rod 11.

[0044] Among them, the outer wall of the floating hemisphere 701 is fitted with an annular scraper 8, and the outer wall of the annular scraper 8 is in contact with the inner wall of the connecting jacking pipe 5.

[0045] With the setting of the annular scraper 8, the floating hemisphere 701 moves up and down under the influence of the liquid flow. In the flowing liquid, some liquids contain media or have high viscosity, which easily adhere to the inner wall of the connecting top pipe 5. When the annular scraper 8 moves downward, it scrapes off the media or viscous liquid on the inner wall of the connecting top pipe 5.

[0046] In this case, a sealing ring 9 is fixedly connected to the inner wall of each pair of through holes, and the inner wall of the sealing ring 9 is in close contact with the outer wall of the movable rod 702.

[0047] By setting the sealing ring 9, the gap between the through hole and the movable rod 702 can be sealed, preventing liquid from penetrating into the transparent sealing cylinder 6, or preventing impurities inside the transparent sealing cylinder 6 from falling into the connecting top pipe 5. Specific Implementation Example 2:

[0049] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, in a preferred embodiment, the threshold adjustment mechanism 10 includes a pair of lead screws 1001. The pair of lead screws 1001 are rotatably connected to the inner bottom end and the top end of the transparent sealing cylinder 6 respectively through bearings. The rectangular movable block 705 located at the top is threadedly connected to the lead screw 1001 located on one side, and the rectangular movable block 705 located at the bottom is threadedly connected to the lead screw 1001 located on the other side. The top ends of the pair of lead screws 1001 are fixedly connected to rotating circular blocks 1003.

[0050] In the specific implementation process, the rotating block 1003 on one side is rotated, which drives the lead screw 1001 on the other side to rotate, causing the rectangular movable block 705 at the top and the first mechanical micro switch 706 to move up and down, adjusting the upper limit threshold position. Then, the rotating block 1003 on the other side is rotated, which drives the lead screw 1001 on the other side to rotate, causing the rectangular movable block 705 at the bottom and the second mechanical micro switch 707 to move up and down, adjusting the lower limit threshold position, so as to make appropriate upper and lower limit threshold adjustments according to its usage requirements, adapting to different working conditions and needs.

[0051] Among them, a pair of rectangular movable blocks 705 are each drilled with threaded through holes 1002 between their top and bottom ends, and the rectangular movable blocks 705 are sleeved on the outer wall of the lead screw 1001 through the threaded through holes 1002 and are threadedly connected to it.

[0052] By setting the threaded through hole 1002, the rectangular movable block 705 and the lead screw 1001 are kept in a threaded connection so that when the lead screw 1001 rotates, it drives the rectangular movable block 705 to move up and down to make appropriate height adjustments.

[0053] The circuits, electronic components, and chip modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0054] All standard parts used in the application documents can be purchased from the market. All components in this application document can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The electrical components mentioned in this document are all electrically connected to the external main controller and power supply, and the main controller is a conventional known device that can play a control role.

[0055] The working principle of this utility model is as follows:

[0056] In use, this invention first rotates one side of the rotating block 1003, causing it to rotate the lead screw 1001 on the same side. This causes the top rectangular movable block 705 and the first mechanical micro switch 706 to move up and down, adjusting the upper threshold position. Then, the other side of the rotating block 1003 rotates, causing it to rotate the lead screw 1001 on the other side. This causes the bottom rectangular movable block 705 and the second mechanical micro switch 707 to move up and down, adjusting the lower threshold position. After adjustment, when the liquid flows through the measuring conduit 2, the electromagnetic flowmeter body 1 measures the flow rate. Simultaneously, the floating hemisphere 701 moves up and down in response to changes in the flow rate. When the flow rate is too high, the floating hemisphere 701 floats upwards, and through a pair of movable rods 702, it drives the ring... When the block 703 moves upward along the central rod 11 and contacts the first mechanical micro switch 706, it triggers an upper limit flow alarm. The first mechanical micro switch 706 is electrically connected to the external main controller and feeds back to the external main controller, causing it to shut down the pump, agitator, and other equipment for protection, thus preventing excessive pipeline pressure and equipment overload. When the flow rate is too low, the buoyancy of the liquid on the floating hemisphere 701 decreases, causing the floating hemisphere 701 to move downward under gravity. This movement is then driven by a pair of movable rods 702 to move the ring block 703 downward along the central rod 11. When it contacts the second mechanical micro switch 707, it triggers a lower limit flow alarm, which feeds back to the external main controller, causing it to shut down the pump, agitator, and other equipment for protection, thus preventing the risk of equipment running dry, wear, or even damage.

[0057] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An electromagnetic flowmeter with an alarm function, characterized in that, include: The electromagnetic flowmeter body (1) and the measuring conduit (2) are fixedly connected to the outer wall of the measuring conduit (2). A pair of terminals (4) are fixedly connected to one side of the electromagnetic flowmeter body (1). Flanges (3) are fitted on both ends of the outer wall of the measuring conduit (2). A connecting top pipe (5) is fixedly connected to the top of the measuring conduit (2), and a transparent sealing cylinder (6) is fixedly connected to the top of the connecting top pipe (5). Upper and lower limit alarm mechanism (7), the upper and lower limit alarm mechanism (7) is set between the connecting top pipe (5) and the transparent sealing cylinder (6), and the upper and lower limit alarm mechanism (7) is used to monitor the abnormal flow rate and trigger an alarm; Threshold adjustment mechanism (10) is disposed inside the transparent sealing cylinder (6) and is used to adjust the upper and lower thresholds; The upper and lower limit alarm mechanism (7) includes a floating hemisphere (701) located inside the connecting top pipe (5). A pair of movable rods (702) are fixedly connected to the top of the floating hemisphere (701). A pair of through holes are drilled at the bottom of the transparent sealing cylinder (6), and the top of the movable rod (702) passes through the through holes and extends into the transparent sealing cylinder (6). A central rod (11) is fixedly connected between the inner walls of the transparent sealing cylinder (6), and an annular block (703) is sleeved on the outer wall of the central rod (11). The outer wall of the annular block (703) is connected to the outer wall of the central rod (11). A connecting block (704) is fixedly connected between the outer walls of a pair of movable rods (702). A pair of rectangular movable blocks (705) are sleeved on the outer wall of the central rod (11). A first mechanical micro switch (706) is fixedly connected to the bottom end of the rectangular movable block (705) at the top, and a second mechanical micro switch (707) is fixedly connected to the top end of the rectangular movable block (705) at the bottom. The first mechanical micro switch (706) and the second mechanical micro switch (707) are located at the top and bottom of the annular block (703), respectively.

2. The electromagnetic flowmeter with alarm function according to claim 1, characterized in that, When the top of the annular block (703) comes into contact with the first mechanical micro switch (706), an upper limit flow alarm is triggered, and when the bottom of the annular block (703) comes into contact with the second mechanical micro switch (707), a lower limit flow alarm is triggered.

3. An electromagnetic flowmeter with alarm function according to claim 1, characterized in that, A round hole is drilled between the top and bottom of the pair of rectangular movable blocks (705), and the pair of rectangular movable blocks (705) are sleeved on the outer wall of the central rod (11) through the round hole.

4. An electromagnetic flowmeter with alarm function according to claim 1, characterized in that, The outer wall of the floating hemisphere (701) is fitted with an annular scraper (8), and the outer wall of the annular scraper (8) is in contact with the inner wall of the connecting jacking pipe (5).

5. An electromagnetic flowmeter with alarm function according to claim 1, characterized in that, A sealing ring (9) is fixedly connected to the inner wall of each pair of through holes, and the inner wall of the sealing ring (9) is in close contact with the outer wall of the movable rod (702).

6. An electromagnetic flowmeter with alarm function according to claim 1, characterized in that, The threshold adjustment mechanism (10) includes a pair of lead screws (1001). The pair of lead screws (1001) are rotatably connected to the inner bottom end and the top end of the transparent sealing cylinder (6) respectively through bearings. The rectangular movable block (705) located at the top is threadedly connected to the lead screw (1001) located on one side, and the rectangular movable block (705) located at the bottom is threadedly connected to the lead screw (1001) located on the other side. The top end of the pair of lead screws (1001) is fixedly connected to a rotating round block (1003).

7. An electromagnetic flowmeter with alarm function according to claim 6, characterized in that, A threaded through hole (1002) is drilled between the top and bottom ends of the pair of rectangular movable blocks (705), and the rectangular movable blocks (705) are sleeved on the outer wall of the lead screw (1001) through the threaded through hole (1002) and threadedly connected to it.

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