Electromagnetic flowmeter beneficial to descaling

Abstract

The utility model is applicable to the technical field of electromagnetic flow meters, and provides an electromagnetic flow meter beneficial to descaling, which comprises a measuring tube and a shell sleeved on the measuring tube, an electromagnetic measuring mechanism used for detecting the internal flow of the measuring tube is arranged on the shell, an accommodating groove is arranged on the inner wall of the measuring tube, and the accommodating groove is communicated with the measuring tube. The two sides of the containing groove extend out of the left side and the right side of the shell respectively, a built-in scraping plate matched with the containing groove is arranged in the containing groove, the built-in scraping plate and the containing groove are arranged to be in an isosceles triangle shape, and a control mechanism used for controlling the built-in scraping plate to slide in the measuring pipe is arranged on the measuring pipe. According to the device, the problem that a measuring circuit is disconnected due to the fact that scale attached to the surface of the electrode is insulated is avoided as much as possible, the measuring precision of the electromagnetic flowmeter during working is guaranteed, and meanwhile when the electromagnetic flowmeter is not used, the built-in scraper is contracted into the containing groove and does not affect flowing of liquid in the measuring pipe; and the fluid flow measurement accuracy of the electromagnetic flowmeter is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic flowmeters, and more particularly to an electromagnetic flowmeter which is advantageous for descaling. Background Art

[0002] An electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the flow rate of a conductive fluid based on the electromotive force induced when the conductive fluid passes through an external magnetic field.

[0003] For example, the existing related patent CN221173523U was retrieved, which discloses an electromagnetic flowmeter. This existing technology can clean the inner wall of the measuring pipe during use through the coordinated arrangement of a fixing ring, a connecting rod, a fixed shaft, fan blades, a spiral scraper, and a connecting ring, thereby preventing impurities in the liquid from adhering to the inner wall of the pipe, thereby achieving the purpose of preventing the electromagnetic flowmeter from being blocked.

[0004] However, the inventor believes that the existing technology has the following problems when used: the existing technology drives the fan blades to rotate through water flow, and then drives the spiral scraper to clean the inner wall of the measuring pipe. At the same time, the existing electromagnetic flowmeter measures the electromotive force induced when the conductive fluid passes through an external magnetic field. The spiral scraper and fan blades are exposed in the measuring pipe. In this way, the fluid will be blocked by the fan blades and spiral scraper when flowing in the measuring pipe, and the flow rate will inevitably change and backflow after blocking will occur, resulting in deviations in the measurement data, thereby affecting the accuracy of the electromagnetic flowmeter in measuring fluid flow. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present utility model is to provide an electromagnetic flowmeter that avoids as much as possible the problem of scale adhering to the surface of the electrode being insulated and disconnecting the measuring circuit, thereby ensuring the measurement accuracy of the electromagnetic flowmeter when it is working. At the same time, when not in use, the built-in scraper is retracted into the storage groove and will not affect the liquid flow in the measuring tube, thereby ensuring the accuracy of the electromagnetic flowmeter's measurement of fluid flow and being conducive to descaling.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An electromagnetic flowmeter that is conducive to scale removal includes a measuring tube and a shell mounted on the measuring tube. The shell is provided with an electromagnetic measuring mechanism for detecting the flow rate inside the measuring tube. A receiving groove is provided on the inner wall of the measuring tube. The two sides of the receiving groove extend from the left and right sides of the shell respectively and are located between the coil and the electrode of the electromagnetic measuring mechanism. A built-in scraper that matches the receiving groove is provided in the receiving groove. The built-in scraper and the receiving groove are both arranged in an isosceles triangle. The measuring tube is provided with a control mechanism for controlling the sliding of the built-in scraper in the measuring tube.

[0008] The utility model is further configured as follows: the control mechanism includes an outer gear ring, an annular groove adapted to the outer gear ring is opened on the measuring tube, the outer gear ring slides in the annular groove, a self-locking motor is provided on the outer surface of the measuring tube, and a gear meshingly connected to the outer gear ring is provided on the output shaft of the self-locking motor.

[0009] The utility model is further configured as follows: the receiving groove is connected to the annular groove, a reset groove is provided on the inner side of the outer gear ring, the reset groove is connected to the annular groove, a connecting plate that matches it is provided in the reset groove, and the reset groove extends from one side of the connecting plate and is connected to the built-in scraper.

[0010] The utility model is further configured as follows: a contraction cavity is opened in the outer gear ring, the contraction cavity is located on the outside of the reset groove, a connecting rod is provided on the surface of the connecting plate facing the contraction cavity, the other end of the connecting rod slides into the contraction cavity, and an end of the connecting rod located in the contraction cavity is provided with a built-in slide sliding in the contraction cavity, and a spring movably sleeved on the outer surface of the connecting rod is provided between the built-in slide and the inner wall of the contraction cavity.

[0011] The utility model is further configured as follows: a rubber pad for increasing sealing performance is provided on the inner wall of the outer gear ring close to the annular groove.

[0012] The utility model is further configured as follows: annular grooves are provided on the inner walls on both sides opposite to each other, an annular slide block that matches the annular groove is provided on the surface of the outer gear ring close to the annular groove, and the annular slide block extends into the annular groove and slides in the annular groove.

[0013] The present invention is further configured as follows: flanges for connecting pipelines are provided at both ends of the measuring tube, and a plurality of support rods for supporting the measuring tube are provided between the flanges and the housing.

[0014] The utility model is further configured as follows: a plurality of grooves are provided on the two inclined surfaces of the built-in scraper, a sliding ball rolling inside the groove is provided, and one end of the sliding ball extends out of the groove and contacts the inner wall of the receiving groove.

[0015] The advantages of the utility model are:

[0016] First, the utility model controls the built-in scraper to move out of the storage groove through a control mechanism and slide on the inner wall of the measuring tube. Therefore, the built-in scraper can scrape off the scale on the inner wall of the measuring tube during the sliding process, thereby avoiding the problem of scale adhering to the electrode surface being insulated and disconnecting the measuring circuit, thereby ensuring the measurement accuracy of the electromagnetic flowmeter when it is working. At the same time, when not in use, the built-in scraper is retracted into the storage groove and will not affect the liquid flow in the measuring tube, thereby ensuring the accuracy of the electromagnetic flowmeter in measuring fluid flow.

[0017] Secondly, the utility model provides a sliding ball, so that when the built-in scraper slides out of the storage groove, the sliding ball can be driven to roll in the groove, thereby reducing the friction generated by the built-in scraper when sliding out of the storage groove, avoiding the problem of the built-in scraper getting stuck as much as possible, and ensuring the stability of the built-in scraper in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an electromagnetic flowmeter that is beneficial for descaling in the utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the measuring tube of the utility model;

[0020] Figure 3 It is a side plan view of the measuring tube of the utility model;

[0021] Figure 4 for Figure 2 Enlarged view of point A in the middle;

[0022] Figure 5 for Figure 3 Enlarged view of point B in the middle.

[0023] In the figure: 1. Shell; 2. Measuring tube; 3. Flange; 4. Receiving groove; 5. Built-in scraper; 6. Control mechanism; 601. External gear ring; 602. Annular groove; 603. Self-locking motor; 604. Gear; 605. Connecting plate; 606. Reset groove; 607. Contraction chamber; 608. Connecting rod; 609. Built-in slide; 610. Spring; 611. Annular slider; 612. Annular slide groove; 7. Groove; 8. Sliding ball; 9. Support rod. DETAILED DESCRIPTION

[0024] See also Figure 1-5 , the utility model provides the following technical solutions:

[0025] Specifically, it refers to an electromagnetic flowmeter that is conducive to descaling, including a measuring tube 2 and a shell 1 sleeved on the measuring tube 2. The shell 1 is provided with an electromagnetic measuring mechanism for detecting the flow inside the measuring tube 2. The electromagnetic measuring mechanism is a known technology and will not be described in detail here. Both ends of the measuring tube 2 are provided with flanges 3 for connecting pipelines. A receiving groove 4 is provided on the inner wall of the measuring tube 2. The two sides of the receiving groove 4 extend from the left and right sides of the shell 1 respectively and are located between the coil and the electrode of the electromagnetic measuring mechanism (see the appendix of the instruction manual). Figure 3), a built-in scraper 5 that matches it is provided in the storage groove 4, and the built-in scraper 5 and the storage groove 4 are both arranged in an isosceles triangle. A control mechanism 6 for controlling the built-in scraper 5 to slide in the measuring tube 2 is provided on the measuring tube 2. When in use, the built-in scraper 5 is controlled by the control mechanism 6 to move out of the storage groove 4 and slide on the inner wall of the measuring tube 2. Therefore, the built-in scraper 5 can scrape off the scale on the inner wall of the measuring tube 2 during the sliding process, and try to avoid the problem of scale attached to the electrode surface being insulated and disconnecting the measuring circuit, thereby ensuring the measurement accuracy of the electromagnetic flowmeter when it is working. At the same time, when not in use, the built-in scraper 5 is retracted into the storage groove 4, which will not affect the liquid flow in the measuring tube 1, thereby ensuring the accuracy of the electromagnetic flowmeter in measuring fluid flow.

[0026] The control mechanism 6 includes an outer gear ring 601, and an annular groove 602 adapted to the outer gear ring 601 is opened on the measuring tube 2. The outer gear ring 601 slides in the annular groove 602. A self-locking motor 603 is provided on the outer surface of the measuring tube 2. A gear 604 meshing with the outer gear ring 601 is provided on the output shaft of the self-locking motor 603. When in use, the self-locking motor 603 is started, and the output shaft of the self-locking motor 603 drives the gear 604 to rotate, so that the gear 604 meshes and drives the outer gear ring 601 to slide in the annular groove 602.

[0027] The receiving groove 4 is communicated with the annular groove 602, and a reset groove 606 is provided on the inner side of the outer gear ring 601. The reset groove 606 is communicated with the annular groove 602, and a connecting plate 605 that matches it is provided in the reset groove 606. The reset groove 606 extends from one side of the connecting plate 605 and is connected to the built-in scraper 5. A contraction cavity 607 is provided in the outer gear ring 601, and the contraction cavity 607 is located on the outside of the reset groove 606. A connecting rod 608 is provided on the surface of the side of the connecting plate 605 facing the contraction cavity 607. The other end of the connecting rod 608 slides through the contraction cavity 607. One end of the connecting rod 608 located in the contraction cavity 607 is provided with a built-in slide 609 that slides in the contraction cavity 607. A spring 610 that is movably sleeved on the outer surface of the connecting rod 608 is provided between the built-in slide 609 and the inner wall of the contraction cavity 607. When the spring 610 is not When squeezed, the spring 610 will form a thrust on the built-in slide plate 609, causing the connecting plate 605 to shrink into the reset groove 606. In this way, when the outer gear ring 601 slides in the annular groove 602, the connecting plate 605 drives the built-in scraper 5 to move, so that the inclined surface of the built-in scraper 5 is squeezed against the inclined surface of the shrinkage groove 4, causing the built-in scraper 5 to move to one side of the center of the measuring tube 2. At the same time, the connecting rod 608 pulls the built-in slide plate 609 to move in the shrinkage cavity 607. The spring 610 is stressed and shrinks. When the built-in scraper 5 is completely displaced out of the shrinkage groove 4, the sharp corner of the built-in scraper 5 contacts the inner wall of the measuring tube 2. At the same time, the spring 610 applies a rebound force to the built-in scraper 5, causing the built-in scraper 5 to be squeezed against the inner wall of the measuring tube 2. Therefore, when the built-in scraper 5 slides on the inner wall of the measuring tube 2, the built-in scraper 5 can better scrape off the scale on the inner wall of the measuring tube 2.

[0028] Annular grooves 612 are provided on the inner walls on both sides opposite to each other of the annular groove 602. An annular slider 611 that matches the annular groove 612 is provided on the surface of the outer gear ring 601 on one side close to the annular groove 612. The annular slider 611 extends into the annular groove 612 and slides in the annular groove 612. In this way, the annular slider 611 forms a supporting effect on the outer gear ring 601, thereby improving the strength of the outer gear ring 601.

[0029] A rubber pad is provided on the inner wall of the outer gear ring 601 near the annular groove 602 to increase the sealing performance, thereby avoiding leakage in the measuring tube 2 when conveying liquid.

[0030] A plurality of support rods 9 for supporting the measuring tube 2 are provided between the flange 3 and the housing 1 , thereby ensuring the strength of the measuring tube 2 and avoiding as much as possible the problem of reducing the strength of the measuring tube 2 due to the installation of the control mechanism 6 .

[0031] There are multiple grooves 7 on the two inclined surfaces of the built-in scraper 5, and a sliding ball 8 is provided in the groove 7 to roll inside the groove. One end of the sliding ball 8 extends out of the groove 7 and contacts the inner wall of the storage groove 4. In this way, when the built-in scraper 5 slides out of the storage groove 4, it can drive the sliding ball 8 to roll in the groove 7, thereby reducing the friction generated by the built-in scraper 5 when sliding out of the storage groove 4, avoiding the problem of the built-in scraper 5 getting stuck as much as possible, and ensuring the stability of the built-in scraper 5 in use.

[0032] The working principle of the electromagnetic flowmeter for descaling provided by the present invention is as follows: the self-locking motor 603 is started, and the output shaft of the self-locking motor 603 drives the gear 604 to rotate, so that the gear 604 meshes and transmits the outer gear ring 601 to slide in the annular groove 602, and the connecting plate 605 drives the built-in scraper 5 to move, so that the inclined surface of the built-in scraper 5 is squeezed against the inclined surface of the contraction groove 4, so that the built-in scraper 5 is displaced to one side of the center of the measuring tube 2, and at the same time, the connecting rod 608 pulls the built-in slide plate 609 to displace in the contraction cavity 607, and the spring 610 is stressed and contracts. When the built-in scraper 5 is completely displaced out of the contraction groove 4, the sharp corner of the built-in scraper 5 contacts the inner wall of the measuring tube 2, and at the same time, the spring 610 applies a rebound force to the built-in scraper 5, so that the built-in scraper 5 is squeezed against the inner wall of the measuring tube 2. Therefore, when the built-in scraper 5 slides on the inner wall of the measuring tube 2, the built-in scraper 5 can better scrape off the scale on the inner wall of the measuring tube 2.

Claims

1. An electromagnetic flowmeter that is beneficial for descaling, comprising a measuring tube (2) and a housing (1) sleeved on the measuring tube (2), wherein the housing (1) is provided with an electromagnetic measuring mechanism for detecting the flow rate inside the measuring tube (2), and characterized in that: A receiving groove (4) is provided on the inner wall of the measuring tube (2), and both sides of the receiving groove (4) extend out of the left and right sides of the housing (1) respectively and are located between the coil and the electrode of the electromagnetic measuring mechanism. A built-in scraper (5) matching the built-in scraper (5) is provided in the receiving groove (4), and the built-in scraper (5) and the receiving groove (4) are both arranged in the shape of an isosceles triangle. A control mechanism (6) for controlling the built-in scraper (5) to slide in the measuring tube (2) is provided on the measuring tube (2).

2. The electromagnetic flowmeter for descaling according to claim 1, characterized in that: The control mechanism (6) includes an outer gear ring (601), an annular groove (602) adapted to the outer gear ring (601) is provided on the measuring tube (2), the outer gear ring (601) slides in the annular groove (602), a self-locking motor (603) is provided on the outer surface of the measuring tube (2), and a gear (604) meshingly connected to the outer gear ring (601) is provided on the output shaft of the self-locking motor (603).

3. The electromagnetic flowmeter for descaling according to claim 2, characterized in that: The receiving groove (4) is in communication with the annular groove (602), and a reset groove (606) is provided on the inner side surface of the outer gear ring (601). The reset groove (606) is in communication with the annular groove (602), and a connecting plate (605) is provided in the reset groove (606) to match the reset groove (606). The reset groove (606) extends from one side of the connecting plate (605) and is connected to the built-in scraper (5).

4. The electromagnetic flowmeter for descaling according to claim 3, characterized in that: A contraction cavity (607) is provided in the outer gear ring (601), and the contraction cavity (607) is located outside the reset groove (606). A connecting rod (608) is provided on the surface of the connecting plate (605) facing the contraction cavity (607). The other end of the connecting rod (608) slides into the contraction cavity (607). One end of the connecting rod (608) located in the contraction cavity (607) is provided with a built-in slide (609) that slides in the contraction cavity (607). A spring (610) that is movably sleeved on the outer surface of the connecting rod (608) is provided between the built-in slide (609) and the inner wall of the contraction cavity (607).

5. The electromagnetic flowmeter for descaling according to claim 3, characterized in that: A rubber pad for increasing sealing performance is provided on the inner wall of the outer gear ring (601) close to the annular groove (602).

6. The electromagnetic flowmeter for descaling according to claim 3, characterized in that: Annular grooves (612) are provided on the inner walls on both sides opposite to each other of the annular groove (602), and an annular slider (611) that matches the annular groove (612) is provided on the surface of the outer gear ring (601) on one side close to the annular groove (612). The annular slider (611) extends into the annular groove (612) and slides in the annular groove (612).

7. The electromagnetic flowmeter for descaling according to claim 6, characterized in that: Both ends of the measuring tube (2) are provided with flanges (3) for connecting to pipelines, and a plurality of support rods (9) for supporting the measuring tube (2) are provided between the flanges (3) and the housing (1).

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