Electromagnetic flowmeter

Abstract

The utility model discloses an electromagnetic flowmeter which comprises a shell and a measuring pipeline, a lining is arranged on the inner wall of the measuring pipeline, the electromagnetic flowmeter further comprises an electrode, the electrode comprises an electrode tip and an electrode shaft, a mounting hole is formed in the lining, a base is fixedly connected to the outer wall of the measuring pipeline, a stepped hole is formed in the base, and the mounting hole is communicated with the stepped hole. A groove is formed in the inner wall of the lining; the electrode shaft is sleeved with a first supporting assembly, a second supporting assembly and a pressing cylinder, a first spring is arranged between the first supporting assembly and the second supporting assembly, a fastener is arranged on one side of the first supporting assembly, the pressing cylinder comprises a pressing plate and a sleeve, and the electrode shaft is sleeved with a sealing ring; a converter is arranged at one end of the base, and the upper connecting ring and the lower connecting ring are connected through a mounting assembly. Through the arrangement of the first supporting assembly and the second supporting assembly, the pretightening force of the first spring is kept consistent, so that the sealing between the electrode tip and the lining is stable and reliable.

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] An electromagnetic flowmeter measures the flow rate of a conductive fluid in a pipeline based on the electromotive force (EMF) induced by the fluid passing through an applied magnetic field. A conventional electromagnetic flowmeter typically consists of an electromagnetic flow sensor and an electromagnetic flow converter. The electromagnetic flow sensor measures the EMF induced by the conductive fluid cutting through the magnetic field and transmits the EMF signal to the electromagnetic flow converter. The electromagnetic flow converter amplifies the tiny EMF signal measured by the electromagnetic flow sensor and converts it into a standard voltage or current signal proportional to the measured fluid flow rate, which is then output to a display. Furthermore, a complete electrically insulating lining is applied to the inner side of the measuring pipeline and the flange sealing surface. This lining, in direct contact with the measured fluid, enhances the corrosion resistance of the measuring pipeline and prevents the induced EMF from being short-circuited by the metal measuring pipe wall. The lining is typically made of soluble polytetrafluoroethylene, a corrosion-resistant, high-temperature-resistant, and wear-resistant material.

[0003] To detect the induced electromotive force (EMF) of the conductive fluid in a pipe, the sensor in an electromagnetic flowmeter requires an electrode assembly mounted on the pipe wall. The electrode typically consists of an electrode head that contacts the fluid and an electrode shaft that penetrates the pipe wall. A terminal is installed at the end of the electrode shaft away from the electrode head to detect the induced electromotive force of the fluid. Since the electrode penetrates the pipe wall, a seal must be maintained between the electrode and the pipe wall. To achieve this, the electrode head is typically placed in close contact with the pipe lining to create a seal. To ensure close contact between the electrode head and the lining, the electrode is preloaded radially outward from the pipe. This preload is achieved using a spring and nut mounted on the electrode shaft. One end of the spring rests against the outer wall of the pipe, while the other end rests against the nut. The nut can be moved along the electrode shaft to adjust the spring tension, thereby varying the preload between the electrode head and the liner. However, in actual installation, the nut's position is often determined by the operator's experience and judgment, which can lead to inconsistent preload generated by the spring. Excessive preload can cause severe deformation or even rupture of the liner. On the contrary, if the preload force is too small, the seal between the electrode head and the liner will fail. Summary of the Invention

[0004] In order to solve the problems pointed out in the background technology, the utility model proposes an electromagnetic flowmeter. By setting a first support assembly and a second support assembly, the preload force of the first spring is kept consistent, thereby making the seal between the electrode head and the liner stable and reliable.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] An electromagnetic flowmeter comprises a housing and a measuring pipe disposed within the housing, a lining disposed on the inner wall of the measuring pipe, and an electrode, the electrode comprising an electrode head and an electrode shaft, the lining being provided with a mounting hole for the electrode shaft to pass through, a base being fixedly connected to the outer wall of the measuring pipe, the base being provided with a stepped hole, the mounting hole being connected to the stepped hole, the stepped hole being disposed at the axis of the base, and a groove being provided on the inner wall of the lining, the groove being connected to the mounting hole;

[0007] The electrode shaft is sequentially mounted with a first support assembly, a second support assembly, and a pressure cylinder from top to bottom. A first spring is disposed between the first support assembly and the second support assembly. A fastener is disposed on the side of the first support assembly away from the second support assembly. The pressure cylinder includes a pressure plate and a sleeve. The pressure plate is located at the step of the stepped hole. The sleeve is located in the small-diameter section of the stepped hole. A sealing ring is mounted on the electrode shaft and is located between the sleeve and the liner.

[0008] The end of the base away from the measuring pipe passes through the shell and is provided with a converter, an upper connecting ring is provided at the bottom of the converter, and a lower connecting ring is provided at the top of the base. The upper connecting ring and the lower connecting ring are connected by a mounting assembly.

[0009] Preferably, the first support assembly, the second support assembly, the first spring and the fastener are all located in the large diameter section of the stepped hole, the first support assembly and the second support assembly are both provided with a through hole along the axial direction, the first support assembly includes a first base plate and a first retaining ring, the first retaining ring is arranged along the edge of the first base plate, a first support portion is arranged in the first retaining ring, the first support portion is located on the side of the first base plate close to the measuring pipe, the outer diameter of the first support portion gradually increases in the direction away from the measuring pipe, and one end of the first spring abuts against the first support portion.

[0010] Preferably, the second support assembly includes a second base plate and a second retaining ring, the second retaining ring is arranged along the edge of the second base plate, a second support portion is arranged inside the second retaining ring, the second support portion is located on the side of the second base plate away from the measuring pipe, the outer diameter of the second support portion gradually increases in the direction approaching the measuring pipe, and the other end of the first spring abuts against the second support portion.

[0011] Preferably, the side of the electrode head away from the electrode shaft is arc-shaped, and the side of the electrode head close to the electrode shaft is fixedly connected to a plurality of positioning columns, and the plurality of positioning columns are arranged in a circular array with the electrode shaft as the center, and a plug hole is opened in the groove, and the plug hole is arranged one-to-one with the positioning column, and the positioning column is plugged into the plug hole.

[0012] Preferably, the portion of the electrode shaft located outside the measuring pipe is formed with an external thread, and the inner side of the fastener is provided with an internal thread that matches the external thread of the electrode shaft.

[0013] Preferably, the lower connecting ring is arranged on the side of the base away from the measuring pipe, and a plurality of limit blocks are arranged in a ring array on the outer ring surface of the lower connecting ring. The upper connecting ring is provided with a limit groove, and the limit groove is arranged in a one-to-one correspondence with the limit blocks.

[0014] Preferably, the mounting assembly includes a clamping block, and a clamping groove cooperating with the clamping block is provided on the outer ring surface of the lower connecting ring. A mounting groove is provided on the upper connecting ring, and the clamping block is slidably set in the mounting groove. The mounting groove is connected to a circular hole at one end away from the central axis of the upper connecting ring, and a pull rod is passed through the circular hole. The pull rod is fixedly connected to a stopper at one end away from the clamping block, and the stopper is located on the outside of the upper connecting ring.

[0015] Preferably, a second spring is provided on the side of the stopper close to the upper connecting ring, one end of the second spring is fixedly connected to the stopper, the second spring is movably sleeved on the pull rod, and the other end of the second spring is fixedly connected to the outer ring surface of the upper connecting ring.

[0016] The beneficial effects of the utility model are:

[0017] The utility model provides a first support assembly and a second support assembly. In the initial state, that is, when the electrode is not locked, a gap is left between the first support assembly and the second support assembly. During the electrode locking process, the first support assembly and the second support assembly are subjected to relative forces to compress the first spring. At the same time, the electrode shaft can move along its own axial direction away from the liner, so as to drive the electrode head to apply an upward force to the liner. Therefore, during the electrode installation process, the gap left between the first support assembly and the second is gradually reduced. When the first retaining ring and the second retaining ring contact each other, the first spring is no longer subjected to force compression to achieve consistency of preload force. At this time, the electrode head and the liner can be tightly connected, thereby making the seal formed between the electrode head and the liner stable and reliable. In addition, the sealing ring is subjected to a set of relative forces applied by the sleeve and the liner, so that the sealing ring can expand along the radial direction of the electrode shaft, so that the inner surface of the sealing ring interacts with the electrode shaft and the outer surface of the sealing ring interacts with the small diameter section of the stepped hole, which is beneficial to improving the sealing performance of the electrode installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the present utility model.

[0019] Figure 2 This utility model Figure 1 Cross-sectional view at AA in the figure, the converter is not shown.

[0020] Figure 3This utility model Figure 2 Schematic diagram of point B in the middle.

[0021] Figure 4 It is a cross-sectional view of the measuring pipe and lining in the utility model.

[0022] Figure 5 It is an exploded view of the power stage, the first support assembly and the second support assembly in the utility model.

[0023] Figure 6 It is an exploded view of the installation components in the utility model.

[0024] Figure 7 It is a schematic diagram of the upper connecting ring in the utility model. DETAILED DESCRIPTION

[0025] The present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0026] like Figures 1 to 7 As shown, an electromagnetic flowmeter includes a housing 1 and a measuring pipe 2 arranged in the housing 1, a lining 3 is provided on the inner wall of the measuring pipe 2, and also includes an electrode 4, the electrode 4 includes an electrode head 41 and an electrode shaft 42, the lining 3 is provided with a mounting hole 5 for the electrode shaft 42 to pass through, a base 6 is fixedly connected to the outer wall of the measuring pipe 2, a stepped hole 7 is provided in the base 6, the mounting hole 5 is connected to the stepped hole 7, the stepped hole 7 is provided at the axis of the base 6, a groove 8 is provided on the inner wall of the lining 3, and the groove 8 is connected to the mounting hole 7. The holes 5 are connected; further, the electrode shaft 42 is sequentially fitted with a first support assembly, a second support assembly and a pressure cylinder 9 from top to bottom, a first spring 10 is provided between the first support assembly and the second support assembly, a fastener 11 is provided on the side of the first support assembly away from the second support assembly, the pressure cylinder 9 includes a pressure plate 91 and a sleeve 92, the pressure plate 91 is located at the step of the stepped hole 7, the sleeve 92 is located in the small diameter section of the stepped hole 7, and a sealing ring 12 is provided on the electrode shaft 42, and the sealing ring 12 is located between the sleeve 92 and the liner 3.

[0027] With the above-described arrangement, in the initial state, i.e., when the electrode 4 is not locked, a gap is left between the first support assembly and the second support assembly. During the locking process of the electrode 4, the first support assembly and the second support assembly are subjected to relative forces to compress the first spring 10. At the same time, the electrode shaft 42 can move along its own axial direction away from the liner 3, so as to drive the electrode head 41 to apply an upward force to the liner 3. As a result, during the installation process of the electrode 4, the gap between the first support assembly and the second is gradually reduced. When the first retaining ring 17 and the second retaining ring 20 contact each other, the first spring 10 is no longer subjected to force compression, thereby achieving consistency in preload force. At this time, the electrode head 41 and the liner 3 can be tightly connected, thereby ensuring a stable and reliable seal between the electrode head 41 and the liner 3. In addition, the sealing ring 12 is subjected to a set of relative forces applied by the sleeve 92 and the liner 3, so that the sealing ring 12 can expand radially along the electrode shaft 42. As a result, the inner surface of the sealing ring 12 interacts with the electrode shaft 42, and the outer surface of the sealing ring 12 interacts with the small diameter section of the stepped hole 7, which is beneficial to improving the sealing performance of the electrode 4 installation location.

[0028] Specifically, the end of the base 6 away from the measuring pipe 2 passes through the housing 1 and is provided with a converter 13, an upper connecting ring 14 is provided at the bottom of the converter 13, and a lower connecting ring 15 is provided at the top of the base 6. The upper connecting ring 14 and the lower connecting ring 15 are connected by an installation assembly.

[0029] In this embodiment, the first support assembly, the second support assembly, the first spring 10 and the fastener 11 are all located in the large diameter section of the stepped hole 7. The first support assembly and the second support assembly are both provided with through holes along the axial direction. The first support assembly includes a first base plate 16 and a first retaining ring 17. The first retaining ring 17 is arranged along the edge of the first base plate 16. A first support portion 18 is provided in the first retaining ring 17. The first support portion 18 is located on the side of the first base plate 16 close to the measuring pipe 2. The outer diameter of the first support portion 18 gradually increases in the direction away from the measuring pipe 2. One end of the first spring 10 abuts against the first support portion 18.

[0030] In this embodiment, the second support assembly includes a second base plate 19 and a second retaining ring 20. The second retaining ring 20 is arranged along the edge of the second base plate 19. A second support portion 21 is provided in the second retaining ring 20. The second support portion 21 is located on the side of the second base plate 19 away from the measuring pipe 2. The outer diameter of the second support portion 21 gradually increases in the direction approaching the measuring pipe 2, and the other end of the first spring 10 abuts against the second support portion 21.

[0031] With this arrangement, the first spring 10 is sandwiched between the first and second support assemblies, so that the first support portion 18 and the second support portion 21 are in contact with the first spring 10. Because both ends of the first spring 10 are mounted on the tapered portion, the first support portion 18 and the second support portion 21 can maintain the two ends of the first spring 10 in parallel. As a result, the force of the first spring 10 is transmitted via the first support portion 18 to the fastener 11 fixed to the electrode shaft 42, thereby pulling the electrode 4 straight and perpendicular to the measuring pipe 2 at all times.

[0032] The side of the electrode head 41 away from the electrode shaft 42 is arc-shaped, and the side of the electrode head 41 close to the electrode shaft 42 is fixedly connected to a plurality of positioning posts 22. The plurality of positioning posts 22 are arranged in a ring array with the electrode shaft 42 as the center. The groove 8 is provided with a plug hole 23, and the plug hole 23 is provided in a one-to-one correspondence with the positioning post 22. The positioning post 22 is inserted into the plug hole 23. The positioning post 22 can play an auxiliary fixing role when fixing the electrode head 41.

[0033] In addition, the portion of the electrode shaft 42 located outside the measuring pipe 2 is formed with an external thread, and the inner side of the fastener 11 is provided with an internal thread that matches the external thread of the electrode shaft 42 , thereby achieving threaded matching between the fastener 11 and the electrode 4 .

[0034] Please refer again Figure 6 and Figure 7 The lower connecting ring 15 is arranged on the side of the base 6 away from the measuring pipe 2, and a plurality of limit blocks 24 are arranged in a ring array on the outer ring surface of the lower connecting ring 15. A limit groove 25 is provided on the upper connecting ring 14, and the limit groove 25 is arranged in a one-to-one correspondence with the limit block 24.

[0035] Among them, the installation component includes a block 26, and a slot 27 that cooperates with the block 26 is also provided on the outer ring surface of the lower connecting ring 15. A mounting groove 28 is provided on the upper connecting ring 14, and the block 26 is slidably set in the mounting groove 28. The mounting groove 28 is connected to a circular hole 29 at one end away from the central axis of the upper connecting ring 14, and a pull rod 30 is passed through the circular hole 29. The pull rod 30 is fixedly connected to a stopper 31 at one end away from the block 26, and the stopper 31 is located on the outside of the upper connecting ring 14.

[0036] Furthermore, a second spring 32 is provided on the side of the stopper 31 close to the upper connecting ring 14, one end of the second spring 32 is fixedly connected to the stopper 31, the second spring 32 is movably mounted on the pull rod 30, and the other end of the second spring 32 is fixedly connected to the outer ring surface of the upper connecting ring 14.

[0037] Through the above-mentioned installation assembly, when the converter 13 needs to be removed, the pull rod 30 is pulled outward through the stopper 31, so that the block 26 slides in the installation groove 28, the block 26 is disengaged from the insertion groove 27, and the second spring 32 is compressed, so that the converter 13 can be removed.

[0038] How to use this product:

[0039] When installing the electrode 4, the electrode shaft 42 is passed outward through the mounting hole 5 on the liner 3, and then through the liner 3, the measuring pipe 2, and then into the stepped hole 7 of the base 6. The positioning column 22 on the electrode head 41 is inserted into the insertion hole 23. Then, the sealing ring 12, the pressure cylinder 9, the second support assembly, the first spring 10 and the first support assembly are installed in sequence. Finally, the fastener 11 is put on and twisted to initially fix it on the electrode shaft 42. When the electrode 4 is not locked, there is a gap between the first support assembly and the second support assembly.

[0040] Then twist the fastener 11 downward, and the rotation of the fastener 11 drives the first support assembly to press down, that is, during the locking process of the electrode 4, the first support assembly and the second support assembly are subjected to relative forces to compress the first spring 10, and at the same time, the electrode shaft 42 can move along its own axial direction away from the liner 3 to drive the electrode head 41 to apply an upward force to the liner 3, so that during the installation process of the electrode 4, the gap between the first support assembly and the second is gradually reduced. When the first retaining ring 17 and the second retaining ring 20 contact each other, the first spring 10 is no longer compressed to achieve consistency of the preload force. At this point, the locking of the electrode 4 is completed. At this time, the electrode head 41 and the liner 3 can be tightly connected, so that the seal formed between the electrode head 41 and the liner 3 is stable and reliable, and the sealing ring 12 is subjected to a set of relative forces applied by the sleeve 92 and the liner 3, so that the sealing ring 12 can expand radially along the electrode shaft 42, which is beneficial to improve the sealing performance of the electrode 4 installation.

[0041] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. An electromagnetic flowmeter, comprising a housing (1) and a measuring pipe (2) arranged in the housing (1), wherein a lining (3) is provided on the inner wall of the measuring pipe (2), characterized in that: It also includes an electrode (4), the electrode (4) including an electrode head (41) and an electrode shaft (42), a mounting hole (5) for the electrode shaft (42) to pass through is provided on the lining (3), a base (6) is fixedly connected to the outer wall of the measuring pipe (2), a stepped hole (7) is provided in the base (6), the mounting hole (5) is connected to the stepped hole (7), the stepped hole (7) is arranged at the axis of the base (6), a groove (8) is provided on the inner wall of the lining (3), and the groove (8) is connected to the mounting hole (5); The electrode shaft (42) is sequentially provided with a first support assembly, a second support assembly and a pressure cylinder (9) from top to bottom, a first spring (10) is provided between the first support assembly and the second support assembly, a fastener (11) is provided on the side of the first support assembly away from the second support assembly, the pressure cylinder (9) comprises a pressure plate (91) and a sleeve (92), the pressure plate (91) is located at the step of the stepped hole (7), the sleeve (92) is located in the small diameter section of the stepped hole (7), a sealing ring (12) is provided on the electrode shaft (42), and the sealing ring (12) is located between the sleeve (92) and the liner (3); One end of the base (6) away from the measuring pipe (2) passes through the housing (1) and is provided with a converter (13); an upper connecting ring (14) is provided at the bottom of the converter (13); a lower connecting ring (15) is provided at the top of the base (6); and the upper connecting ring (14) and the lower connecting ring (15) are connected via a mounting assembly.

2. The electromagnetic flowmeter according to claim 1, characterized in that The first support assembly, the second support assembly, the first spring (10) and the fastener (11) are all located in the large diameter section of the stepped hole (7); the first support assembly and the second support assembly are both provided with through holes along the axial direction; the first support assembly comprises a first base plate (16) and a first retaining ring (17); the first retaining ring (17) is arranged along the edge of the first base plate (16); a first support portion (18) is arranged in the first retaining ring (17); the first support portion (18) is located on a side of the first base plate (16) close to the measuring pipe (2); the outer diameter of the first support portion (18) gradually increases in a direction away from the measuring pipe (2); and one end of the first spring (10) abuts against the first support portion (18).

3. The electromagnetic flowmeter according to claim 1, characterized in that The second support assembly comprises a second base plate (19) and a second retaining ring (20), wherein the second retaining ring (20) is arranged along the edge of the second base plate (19), and a second support portion (21) is arranged in the second retaining ring (20), wherein the second support portion (21) is located on a side of the second base plate (19) away from the measuring pipe (2), and the outer diameter of the second support portion (21) gradually increases in a direction approaching the measuring pipe (2), and the other end of the first spring (10) abuts against the second support portion (21).

4. The electromagnetic flowmeter according to claim 1, characterized in that The side of the electrode head (41) away from the electrode shaft (42) is arc-shaped, and the side of the electrode head (41) close to the electrode shaft (42) is fixedly connected to a plurality of positioning columns (22), and the plurality of positioning columns (22) are arranged in a ring array with the electrode shaft (42) as the center. A plug hole (23) is opened in the groove (8), and the plug hole (23) is arranged in a one-to-one correspondence with the positioning column (22), and the positioning column (22) is plugged into the plug hole (23).

5. The electromagnetic flowmeter according to claim 1, characterized in that The portion of the electrode shaft (42) located outside the measuring pipe (2) is formed with an external thread, and the inner side of the fastener (11) is provided with an internal thread that matches the external thread of the electrode shaft (42).

6. The electromagnetic flowmeter according to claim 1, characterized in that The lower connecting ring (15) is arranged on a side of the base (6) away from the measuring pipe (2), and a plurality of limit blocks (24) are arranged in a ring array on the outer ring surface of the lower connecting ring (15). The upper connecting ring (14) is provided with a limit groove (25), and the limit groove (25) is arranged in a one-to-one correspondence with the limit blocks (24).

7. The electromagnetic flowmeter according to claim 1, characterized in that The mounting assembly includes a clamping block (26), a clamping groove (27) matching with the clamping block (26) is provided on the outer ring surface of the lower connecting ring (15), and a mounting groove (28) is provided on the upper connecting ring (14). The clamping block (26) is slidably set in the mounting groove (28), and the mounting groove (28) is connected to a circular hole (29) at one end away from the central axis of the upper connecting ring (14). A pull rod (30) is passed through the circular hole (29), and the pull rod (30) is fixedly connected to a stopper (31) at one end away from the clamping block (26). The stopper (31) is located outside the upper connecting ring (14).

8. The electromagnetic flowmeter according to claim 7, characterized in that A second spring (32) is provided on one side of the stopper (31) close to the upper connecting ring (14), one end of the second spring (32) is fixedly connected to the stopper (31), the second spring (32) is movably mounted on the pull rod (30), and the other end of the second spring (32) is fixedly connected to the outer ring surface of the upper connecting ring (14).

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