Plug-in type electromagnetic flowmeter

Abstract

The utility model relates to the field of flow metering instruments, in particular to a plug-in type electromagnetic flowmeter which comprises a meter head, a measuring tube arranged on the meter head, a measuring probe arranged at the bottom of the measuring tube, a ball valve sleeved on the measuring tube and a base sleeved on the ball valve. A nut is arranged at the end, away from the ball valve, of the sealing pipe and communicated with the sealing pipe, a threaded hole and a conical hole are sequentially formed in the end, close to the ball valve, of the sealing pipe in the direction away from the ball valve, the hole diameter of the conical hole is gradually decreased in the direction away from the ball valve, a first pressing ring is sleeved with the conical hole, and a gland is sleeved with the threaded hole in a threaded mode. A sleeve hole is formed in the middle of the gland, the measuring tube is sleeved with the sleeve hole, the first pressing ring is extruded in the conical hole through the gland and the nut, and the measuring tube is sleeved with the first pressing ring in an interference mode. The utility model provides the plug-in type electromagnetic flowmeter which improves the sealing effect of the measuring tube and reduces stress concentration.

Description

Technical Field

[0001] The utility model relates to the field of flow metering instruments, in particular to an insertion-type electromagnetic flowmeter. Background Art

[0002] An electromagnetic flowmeter is an instrument used to measure the flow of conductive fluids. Its operating principle is based on Faraday's law of electromagnetic induction. A constant magnetic field is generated by an excitation coil. As the conductive fluid flows through a pipe, its movement cuts through the magnetic lines of force, generating an induced electromotive force (EMF). The magnitude of the induced EMF is proportional to the fluid's flow rate. Therefore, by measuring the induced EMF using electrodes, the flow rate within the pipe can be calculated, and thus the flow rate. Due to the lack of pressure loss, the absence of moving parts, and high reliability of electromagnetic flowmeters, they are widely used in various industries. They are effective in measuring liquid flow in industries such as chemical, petroleum, metallurgy, power generation, and water treatment. Commonly used electromagnetic flowmeters include pipeline and insertion types, differing primarily in their structure and installation methods. Pipeline electromagnetic flowmeters connect to the user's pipeline via two flanges on the left and right sides of the meter body. Insertion electromagnetic flowmeters, on the other hand, have a hole cut into the top of the user's pipeline. The base is welded to the hole, allowing the meter to be inserted into the pipeline. This insertion design makes them simpler and more convenient to install. However, for large-diameter user pipelines, the cost of using a pipeline electromagnetic flowmeter is relatively high and the installation is more difficult. Therefore, for large-diameter user pipelines, insertion electromagnetic flowmeters are relatively low-cost and do not require the user pipeline to be cut, making installation simpler and more convenient. This advantage makes insertion electromagnetic flowmeters more cost-effective and more valuable for flow measurement in large-diameter pipelines.

[0003] Insertion-type electromagnetic flowmeters are flow measurement devices widely used in industrial pipelines. They consist of several key components: a measuring tube, a measuring probe, a base, and a sealing ring. The measuring probe is mounted at the end of the measuring tube, directly contacting and measuring the fluid flow rate. The base is a fixture mounted on the outer wall of the user's pipeline. By attaching the measuring tube to the base, it secures the measuring tube and the measuring probe, which extends into the user's pipeline. The sealing ring is an interference fit between the measuring tube and the base, providing a seal. However, during the actual installation of an insertion-type electromagnetic flowmeter, once the measuring tube is inserted into the user's pipeline, the fluid flowing through the pipeline can impact the measuring tube. This impact can cause the measuring tube to move, which in turn affects the sealing ring's seal on the measuring tube, creating a gap between the sealing ring and the measuring tube, increasing the risk of leakage. Furthermore, if the measuring tube is directly mounted on the base when subjected to fluid impact, stress concentration can occur between the measuring tube and the base. This stress concentration can lead to excessive localized strain in the measuring tube and base, reducing their strength. In areas of stress concentration, cracks may even appear, leading to breakage. Therefore, there is room for improvement in the practical application of insertion-type electromagnetic flowmeters to improve the sealing effect of the measuring tube and reduce stress concentration, thereby better meeting the needs of flow measurement. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the utility model provides an insertion-type electromagnetic flowmeter which improves the sealing effect of a measuring tube and reduces stress concentration, and is used to overcome the defects in the prior art.

[0005] The technical solution adopted by the utility model is: an insertion type electromagnetic flowmeter, comprising a head, a measuring tube arranged on the head, a measuring probe arranged at the bottom of the measuring tube, a ball valve sleeved on the measuring tube and a base sleeved on the ball valve, wherein the ball valve is threadedly sleeved with a sealing tube on one side away from the base, a nut is arranged at one end of the sealing tube away from the ball valve, the nut and the sealing tube are connected, the end of the sealing tube close to the ball valve is sequentially provided with a threaded hole and a tapered hole along a direction away from the ball valve, the threaded hole and the tapered hole are both provided on the inner wall of the sealing tube, the threaded hole and the tapered hole are connected, the aperture of the tapered hole gradually decreases along the direction away from the ball valve, a first pressure ring is sleeved in the tapered hole, the outer shape of the first pressure ring is consistent with the inner shape of the tapered hole, a pressure cap is threadedly sleeved in the threaded hole, a sleeve hole is provided in the middle of the pressure cap, the sleeve hole is sleeved on the measuring tube, the first pressure ring is squeezed in the tapered hole by the pressure cap and the nut, and the first pressure ring is interference sleeved on the measuring tube.

[0006] Preferably, a fixing tube is provided at the bottom of the meter head, and a through tube is provided above the meter head. The through tube and the fixed tube are respectively installed on both sides of the meter head. The through tube and the fixed tube are both connected to the inner cavity of the meter head. The through tube and the fixed tube are both movably sleeved on the measuring tube. Several fixing holes are opened on the side wall of the fixed tube. Several fixing holes are evenly distributed on the fixed tube. First bolts are respectively threadedly sleeved in several fixing holes. The measuring tube is squeezed and fixed to the fixed tube by the first bolt. The inner cavity diameter of the through tube is not less than the outer wall diameter of the measuring tube. The top thread of the through tube is sleeved with a threaded cover.

[0007] Preferably, a cylinder is provided above the measuring probe, the cylinder and the measuring probe are an integrated structure, the cylinder thread is sleeved on the bottom end of the measuring tube, a sealing ring made of elastic material is interference fit on the cylinder, and the top surface of the sealing ring is in contact with the bottom end of the measuring tube.

[0008] Preferably, the bottom end thread sleeve of the measuring tube is provided with a sealing cover, the thread groove opened on the inner wall of the sealing cover is in the opposite spiral direction to the thread groove opened on the inner wall of the measuring tube, the sealing ring is located in the sealing cover, and the sealing ring is squeezed on the bottom end of the measuring tube through the sealing cover, and a through hole is opened in the middle of the sealing cover, and the through hole is movably sleeved on the measuring probe.

[0009] Preferably, a packing ring and a second pressure ring are sequentially arranged on the side of the first pressure ring away from the pressure cover in the direction away from the pressure cover, the packing ring and the second pressure ring are respectively interference fit in the sealing tube, one side of the second pressure ring is in contact with the nut, the second pressure ring, the packing ring and the first pressure ring are squeezed onto the nut through the pressure cover, and the second pressure ring and the packing ring are both interference fit on the measuring tube.

[0010] Preferably, a scale layer is provided on the outer wall of the measuring tube, and the scale layer extends along the direction from the measuring probe to the meter head.

[0011] Preferably, the nut and the sealing tube are an integrated structure, a plurality of support holes are opened on the side wall of the nut, the plurality of support holes are evenly distributed on the nut, a second bolt is threadedly installed in each of the plurality of support holes, and the measuring tube is fixed to the nut by squeezing the second bolt.

[0012] The utility model has the following beneficial effects: first, the utility model seals the gap between the measuring tube and the sealing tube by providing a first pressure ring, and through the tapered hole provided in the measuring tube, when the measuring tube is under pressure, the measuring tube drives the first pressure ring to move, thereby limiting the inward extrusion of the first pressure ring by means of the tapered hole, that is, driving the first pressure ring to squeeze the measuring tube, avoiding the formation of a gap between the measuring tube and the first pressure ring, thereby improving the sealing effect of the gap between the measuring tube and the tapered hole, and sharing the pressure on the measuring tube, thereby reducing the stress concentration phenomenon in the measuring tube, and thus improving the stability of the measuring tube. In addition, the utility model controls the connection between the sealing tube and the base by providing a ball valve between the sealing tube and the base, and by moving the measuring probe to the side of the ball valve away from the base and then closing the ball valve, the measuring tube and the measuring probe can be removed, so that the measuring tube and the measuring probe can be installed and removed during pipeline operation. The first pressure ring is limited by the provided pressure cap, and since the pressure cap is threadedly sleeved in the threaded hole, the first pressure ring can be removed by removing the pressure cap for replacement.

[0013] Secondly, the utility model can assemble the meter head to the measuring tube by means of the first bolt and the fixing tube, and can make the measuring tube pass through the top of the meter head by means of the provided through-tube, thereby facilitating adjustment of the installation position of the meter head on the measuring tube. Moreover, the utility model can install the measuring probe on the bottom end of the measuring tube by means of the provided cylinder, and seal the gap between the bottom end of the measuring tube and the cylinder by means of the sealing ring provided on the cylinder and the sealing cover threadedly fitted on the measuring tube, thereby preventing the fluid transported in the pipeline from entering the gap between the measuring tube and the cylinder. Since the spiral direction of the thread groove provided on the inner wall of the sealing cover is opposite to that of the thread groove provided on the inner wall of the measuring tube, when the cylinder is loosened relative to the measuring tube, the sealing cover will be driven to tighten relative to the measuring tube, thereby improving the clamping effect of the sealing ring, thereby improving the sealing effect of the gap between the measuring tube and the cylinder.

[0014] Furthermore, the present invention uses a packing ring and a second pressure ring to seal the gap between the measuring tube and the sealing tube. This allows the sealing tube to maintain a seal against the measuring tube even when the measuring tube is withdrawn, further improving the leak-proof effect. By observing the position of the top surface of the nut on the scale layer provided on the measuring tube, the length of the measuring tube inserted into the pipeline can be determined. Furthermore, a second bolt is provided to connect the measuring tube and the sealing tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the present utility model.

[0016] Figure 2 This is an assembly cross-sectional view of the measuring tube and the sealing tube in the utility model.

[0017] Figure 3 for Figure 2 Enlarged schematic diagram of point A in the middle.

[0018] Figure 4 This is a stereoscopic diagram of the assembly of the sealing tube, the gland and the second bolt in the present invention.

[0019] Figure 5 This is a three-dimensional diagram of the assembly of the meter head, the first bolt and the threaded cover in the present invention.

[0020] Figure 6 This is an assembly cross-sectional view of the measuring tube and measuring probe in the present utility model.

[0021] Figure 7 This is an exploded view of the assembly of the measuring tube, measuring probe and sealing cover in the present invention. DETAILED DESCRIPTION

[0022] like Figures 1 to 7As shown, an insertion-type electromagnetic flowmeter includes a meter head 1, a measuring tube 2 provided on the meter head 1, a measuring probe 3 provided at the bottom of the measuring tube 2, a ball valve 4 fitted on the measuring tube 2, and a base 5 fitted on the ball valve 4. The measuring probe 3 includes an insulating shell, an excitation coil and an electrode group respectively provided on the insulating shell. The electrode group includes two detection electrodes. The excitation coil is used to create a magnetic field. The detection electrode is used to measure the charge of the fluid transported in the pipeline. The insulating shell is used to insulate the electrodes to prevent the electrodes from short-circuiting. A sealing tube 6 is threadedly provided on the side of the ball valve 4 away from the base 5. A nut 7 is provided on the end of the sealing tube 6 away from the ball valve 4. The nut 7 and the sealing tube 6 are connected. The sealing tube 6 is provided with a threaded hole 8 and a tapered hole 9 in sequence at one end close to the ball valve 4 in a direction away from the ball valve 4. The threaded hole 8 and the tapered hole 9 are both provided on the inner wall of the sealing tube 6. The threaded hole 8 and the tapered hole 9 are connected. The aperture of the tapered hole 9 gradually decreases in the direction away from the ball valve 4. A first pressure ring 10 is sleeved in the tapered hole 9. The external shape of the first pressure ring 10 is consistent with the inner shape of the tapered hole 9. A pressure cap 11 is sleeved in the threaded hole 8. A sleeve hole is provided in the middle of the pressure cap 11. The sleeve hole is sleeved on the measuring tube 2. The first pressure ring 10 is squeezed in the tapered hole 9 through the pressure cap 11 and the nut 7. The first pressure ring 10 is interference fit on the measuring tube 2. The pressure cap 11 is located in the ball valve 4, so that the first pressure ring 10 is used to seal the gap between the measuring tube 2 and the tapered hole 9 to prevent leakage. By unscrewing the pressure cap 11, the first pressure ring 10 can be taken out so that the first pressure ring 10 can be replaced; in addition, since the first pressure ring 10 is conical in design, when the measuring tube 2 is pressurized, the measuring tube 2 drives the first pressure ring 10 to move in the direction away from the ball valve 4. Since the aperture of the tapered hole 9 gradually decreases in the direction away from the ball valve 4, the first pressure ring 10 is squeezed inward, so that the first pressure ring 10 squeezes the measuring tube 2, so as to improve the sealing effect of the gap between the measuring tube 2 and the tapered hole 9, and share the pressure on the measuring tube 2, thereby reducing the stress concentration phenomenon in the measuring tube 2, and thus improving the stability of the measuring tube 2 in use.

[0023] In this embodiment, a fixing tube 12 is provided at the bottom of the meter head 1, and a through tube 13 is provided above the meter head 1. The through tube 13 and the fixing tube 12 are respectively installed on both sides of the meter head 1, and the through tube 13 and the fixing tube 12 are both connected to the inner cavity of the meter head 1. The through tube 13 and the fixing tube 12 are both movably sleeved on the measuring tube 2. Several fixing holes 14 are opened on the side wall of the fixing tube 12. Several fixing holes 14 are evenly distributed on the fixing tube 12. First bolts 15 are respectively threadedly sleeved in several fixing holes 14. The measuring tube 2 is squeezed and fixed to the fixing tube 12 by the first bolts 15, so that the meter head 1 is assembled to the measuring tube 2. The inner cavity diameter of the through tube 13 is not less than the outer wall diameter of the measuring tube 2. The top of the through tube 13 is threaded with a threaded cover 16 to close the top of the through tube 13. The position of the measuring tube 2 is clamped by adjusting the first bolt 15 to facilitate the control of the installation position of the meter head 1 on the measuring tube 2.

[0024] Please refer again Figure 6 and 7 A cylinder 17 is provided above the measuring probe 3. The cylinder 17 and the measuring probe 3 are an integrated structure. The cylinder 17 is threadedly sleeved on the bottom end of the measuring tube 2, so that the measuring probe 3 is installed on the measuring tube 2. A sealing ring 18 made of elastic material is interference-fitted on the cylinder 17. The top surface of the sealing ring 18 contacts the bottom end of the measuring tube 2, thereby sealing the gap between the bottom end of the measuring tube 2 and the cylinder 17, preventing the fluid transported in the pipeline from entering the gap between the measuring tube 2 and the cylinder 17.

[0025] Specifically, the bottom end of the measuring tube 2 is threadedly sleeved with a sealing cover 19, and the spiral direction of the thread groove opened on the inner wall of the sealing cover 19 is opposite to that of the thread groove opened on the inner wall of the measuring tube 2. The sealing ring 18 is located in the sealing cover 19, and the sealing ring 18 is squeezed on the bottom end of the measuring tube 2 through the sealing cover 19. A perforation is opened in the middle of the sealing cover 19, and the perforation is movably sleeved on the measuring probe 3. The bottom plate of the sealing cover 19 is in contact with the cylinder 17. When the measuring probe 3 drives the cylinder 17 to loosen relative to the measuring tube 2, the cylinder 17 will drive the sealing cover 19 to rotate relative to the measuring tube 2. Since the spiral direction of the thread groove opened on the inner wall of the sealing cover 19 is opposite to that of the thread groove opened on the inner wall of the measuring tube 2, the cylinder 17 will drive the sealing cover 19 to tighten, so as to improve the clamping effect of the sealing ring 18, thereby improving the sealing effect of the gap between the measuring tube 2 and the cylinder 17.

[0026] In this embodiment, a packing ring 20 and a second pressure ring 21 are sequentially provided on the side of the first pressure ring 10 away from the pressure cover 11 in the direction away from the pressure cover 11. The packing ring 20 and the second pressure ring 21 are respectively interference-fitted into the sealing tube 6. One side of the second pressure ring 21 is in contact with the nut 7. The second pressure ring 21, the packing ring 20 and the first pressure ring 10 are squeezed onto the nut 7 through the pressure cover 11. The second pressure ring 21 and the packing ring 20 are both interference-fitted onto the measuring tube 2, thereby sealing the gap between the measuring tube 2 and the sealing tube 6 to improve the effect of preventing liquid leakage.

[0027] Please refer again Figure 1 A scale layer 22 is provided on the outer wall of the measuring tube 2, and the scale layer 22 extends along the direction from the measuring probe 3 to the meter head 1. By observing the position of the top surface of the nut 7 at the scale layer 22, it is convenient to understand the length of the measuring tube 2 extending into the pipeline.

[0028] Specifically, the nut 7 and the sealing tube 6 are an integrated structure, and a plurality of support holes 23 are opened on the side wall of the nut 7. The plurality of support holes 23 are evenly distributed on the nut 7. Second bolts 24 are respectively threadedly installed in the plurality of support holes 23. The measuring tube 2 is squeezed and fixed on the nut 7 by the second bolts 24, thereby connecting the measuring tube 2 and the sealing tube 6.

[0029] The assembly method of this product is as follows: Figures 1 to 7 As shown, first, select the location on the user's pipeline for installing this product. It is recommended to install this product in the lower section of the user's pipeline. After selecting the installation location for this product, fix the base 5 to the outer wall of the user's pipeline, use a welding gun or other tool to weld the bottom end of the base 5 to the user's pipeline, and then install one side of the ball valve 4 on the top of the base 5. Subsequently, install the hole opener on the other side of the ball valve 4. By turning on the switch of the ball valve 4, the drill bit of the hole opener moves toward the user's pipeline, and then operate the hole opener to use the hole opener to open a hole in the side wall of the user's pipeline. After the hole is opened, control the drill bit of the hole opener to move in the direction away from the user's pipeline. After the drill bit is removed from the ball valve 4, turn off the switch of the ball valve 4 to remove the hole opener from the other side of the ball valve 4.

[0030] Next, assemble the measuring probe 3. First, rotate the cylinder 17 into the measuring tube 2 so that the wires of the measuring probe 3 extend from the top of the measuring tube 2. Then, fit the sealing ring 18 onto the cylinder 17 and rotate the sealing cap 19 to complete the installation of the measuring probe 3. Next, sequentially assemble the second pressure ring 21, the packing ring 20, and the first pressure ring 10 into the sealing tube 6. The measuring tube 2 is interference-fitted into the second pressure ring 21, the packing ring 20, and the first pressure ring 10. The pressure cap 11 is screwed into the threaded hole 8 to compress the second pressure ring 21, the packing ring 20, and the first pressure ring 10 onto the nut 7. Then, install the sealing tube 6 on the other side of the ball valve 4, open the ball valve 4, and push the measuring tube 2 to allow it to penetrate the user's pipeline. The length of the measuring tube 2 inserted into the user's pipeline can be determined by observing the position of the top surface of the nut 7 at the scale layer 22. After the measuring tube 2 has been inserted into the user's pipeline to the specified length, tighten the second bolt 24 to clamp the measuring tube 2 within the sealing tube 6. Finally, insert the fixing tube 12 and the meter head 1 into the measuring tube 2 and adjust the assembly position of the meter head 1. Once the meter head 1 is properly assembled, tighten the first bolt 15 to clamp the meter head 1 to the measuring tube 2, thus completing the assembly of this product.

[0031] Through this embodiment, the gap between the measuring tube 2 and the sealing tube 6 is sealed by the provided first pressure ring 10, and the tapered hole 9 opened on the measuring tube 2 allows the measuring tube 2 to drive the first pressure ring 10 to move when the measuring tube 2 is under pressure, thereby limiting the inward extrusion of the first pressure ring 10 with the help of the tapered hole 9, that is, driving the first pressure ring 10 to squeeze the measuring tube 2, avoiding the formation of a gap between the measuring tube 2 and the first pressure ring 10, thereby improving the sealing effect of the gap between the measuring tube 2 and the tapered hole 9, and sharing the pressure on the measuring tube 2, avoiding stress concentration in the measuring tube 2, and thereby improving the stability of the measuring tube 2 in use. Moreover, this embodiment controls the connection between the sealing tube 6 and the base 5 by providing a ball valve 4 between the sealing tube 6 and the base 5. By moving the measuring probe 3 to the side of the ball valve 4 away from the base 5 and then closing the ball valve 4, the measuring tube 2 and the measuring probe 3 can be removed, so that the measuring tube 2 and the measuring probe 3 can be loaded and unloaded when the pipeline is in operation. The first pressure ring 10 is limited by the provided pressure cap 11. Since the pressure cap 11 is threadedly sleeved in the threaded hole 8, the first pressure ring 10 can be removed by removing the pressure cap 11 so that the first pressure ring 10 can be replaced.

[0032] 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 insertion-type electromagnetic flowmeter, comprising a meter head (1), a measuring tube (2) provided on the meter head (1), a measuring probe (3) provided at the bottom of the measuring tube (2), a ball valve (4) fitted on the measuring tube (2), and a base (5) fitted on the ball valve (4), characterized in that: The ball valve (4) is threadedly sleeved with a sealing tube (6) on one side away from the base (5), and a nut (7) is provided on the end of the sealing tube (6) away from the ball valve (4). The nut (7) and the sealing tube (6) are connected. The end of the sealing tube (6) close to the ball valve (4) is provided with a threaded hole (8) and a tapered hole (9) in sequence along the direction away from the ball valve (4). The threaded hole (8) and the tapered hole (9) are both provided on the inner wall of the sealing tube (6). The threaded hole (8) and the tapered hole (9) are connected. The tapered hole (9) The aperture gradually decreases in the direction away from the ball valve (4), and a first pressure ring (10) is installed in the tapered hole (9). The external shape of the first pressure ring (10) matches the inner shape of the tapered hole (9). The threaded hole (8) is internally threaded with a pressure cover (11). A sleeve hole is opened in the middle of the pressure cover (11), and the sleeve hole is installed on the measuring tube (2). The first pressure ring (10) is squeezed into the tapered hole (9) through the pressure cover (11) and the nut (7), and the first pressure ring (10) is interference-fitted on the measuring tube (2).

2. The insertion type electromagnetic flowmeter according to claim 1, characterized in that: The bottom of the meter head (1) is provided with a fixed tube (12), and the top of the meter head (1) is provided with a through tube (13). The through tube (13) and the fixed tube (12) are respectively installed on both sides of the meter head (1). The through tube (13) and the fixed tube (12) are both connected to the inner cavity of the meter head (1). The through tube (13) and the fixed tube (12) are both movably sleeved on the measuring tube (2). A plurality of fixing holes (14) are opened on the side wall of the fixed tube (12). The plurality of fixing holes (14) are evenly distributed on the fixed tube (12). The plurality of fixing holes (14) are respectively threadedly sleeved with first bolts (15). The measuring tube (2) is squeezed and fixed on the fixed tube (12) by the first bolts (15). The inner cavity diameter of the through tube (13) is not less than the outer wall diameter of the measuring tube (2). The top of the through tube (13) is threadedly sleeved with a threaded cover (16).

3. The insertion type electromagnetic flowmeter according to claim 1, characterized in that: A cylinder (17) is provided above the measuring probe (3). The cylinder (17) and the measuring probe (3) are an integrated structure. The cylinder (17) is threadedly mounted on the bottom end of the measuring tube (2). A sealing ring (18) made of elastic material is interference-fitted on the cylinder (17). The top surface of the sealing ring (18) is in contact with the bottom end of the measuring tube (2).

4. The insertion type electromagnetic flowmeter according to claim 3, characterized in that: The bottom end of the measuring tube (2) is threadedly sleeved with a sealing cover (19), the thread groove opened on the inner wall of the sealing cover (19) is in the opposite spiral direction to the thread groove opened on the inner wall of the measuring tube (2), the sealing ring (18) is located in the sealing cover (19), and the sealing ring (18) is squeezed on the bottom end of the measuring tube (2) through the sealing cover (19), and a through hole is opened in the middle of the sealing cover (19), and the through hole is movably sleeved on the measuring probe (3).

5. The insertion type electromagnetic flowmeter according to claim 1, characterized in that: A packing ring (20) and a second packing ring (21) are sequentially arranged on a side of the first pressure ring (10) away from the pressure cover (11) in a direction away from the pressure cover (11). The packing ring (20) and the second pressure ring (21) are respectively interference-fitted into the sealing tube (6). One side of the second pressure ring (21) is in contact with the nut (7). The second pressure ring (21), the packing ring (20) and the first pressure ring (10) are squeezed onto the nut (7) through the pressure cover (11). The second pressure ring (21) and the packing ring (20) are both interference-fitted onto the measuring tube (2).

6. The insertion type electromagnetic flowmeter according to claim 1, characterized in that: A scale layer (22) is provided on the outer wall of the measuring tube (2), and the scale layer (22) extends in a direction from the measuring probe (3) to the meter head (1).

7. The insertion type electromagnetic flowmeter according to claim 1, characterized in that: The nut (7) and the sealing tube (6) are an integrated structure. A plurality of supporting holes (23) are provided on the side wall of the nut (7). The plurality of supporting holes (23) are evenly distributed on the nut (7). Second bolts (24) are respectively threadedly sleeved in the plurality of supporting holes (23). The measuring tube (2) is fixed to the nut (7) by being squeezed by the second bolts (24).

Images