Plug-in turbine flowmeter

Abstract

The utility model relates to the field of flowmeter equipment, in particular to an insertion type turbine flowmeter which comprises a meter head, an insertion rod vertically arranged below the meter head and an impeller horizontally and rotatably arranged at the bottom end of the insertion rod, a fixing sleeve is arranged on the outer side of the insertion rod, one end of the fixing sleeve is installed on the side wall of the bottom of the insertion rod, and the other end of the fixing sleeve is installed on the side wall of the bottom of the insertion rod. A fixing groove is formed in the bottom end of the inserting rod, a penetrating hole is formed in the side wall of the inserting rod, the middle of the penetrating hole is communicated with the fixing groove, a bearing is sleeved with the fixing groove, a rotating shaft is sleeved with the bearing, the rotating shaft is movably sleeved with the penetrating hole, and the part, penetrating out of the penetrating hole, of the rotating shaft is installed on the impeller. The top of the inserting rod is sleeved with a connecting sleeve, the top of the connecting sleeve and the bottom of the gauge outfit are respectively provided with a flange plate, and the gauge outfit is connected with the connecting sleeve through the flange plates. The utility model provides a plug-in type turbine flowmeter which can reduce the extrusion on a rotating shaft and conveniently adjust the insertion depth of an impeller, and is used for overcoming the defects in the prior art.

Description

Technical Field

[0001] The utility model relates to the field of flowmeter devices, and particularly relates to an insertion type turbine flowmeter. Background Art

[0002] As the main type of impeller flowmeter, a turbine flowmeter mainly consists of an impeller, bearings, a preamplifier, and a display instrument component. The working principle of a turbine flowmeter is that when the measured fluid flows through the user pipeline where the turbine flowmeter is located, the fluid will impact the impeller of the turbine flowmeter, which generates a torque to drive the impeller to rotate, thereby driving the turbine to rotate. Since the faster the fluid velocity flowing through the user pipeline, the greater the impact force on the impeller, which will drive the impeller to rotate faster. That is to say, the rotational angular velocity of the impeller is proportional to the fluid velocity. In this way, the rotation speed of the turbine can be detected, and indirectly, the fluid flow rate can be calculated. The rotation speed of the impeller is detected by a sensing coil installed outside the housing. When the blades of the impeller cut the magnetic field lines generated by the magnet in the housing, it will cause a change in the magnetic flux in the sensing coil, and then an induced signal is generated. This signal is amplified and shaped, and then sent to the display instrument for measurement and display, thereby realizing the measurement of the fluid flow rate. An insertion type turbine flowmeter is a special type of turbine flowmeter. It inserts the impeller for measuring the flow velocity into the user pipeline through a reserved hole in the user pipeline. First, it measures the local flow velocity in the user pipeline through the insertion type flowmeter, and then calculates the flow area of the user pipeline based on the measurement, so as to calculate the flow rate of the user pipeline. The insertion type turbine flowmeter is widely used in fields such as petroleum and chemical industry that require precise flow measurement due to its strong anti-pollution ability and excellent anti-vibration performance.

[0003] After the insertion flowmeter is installed in the user's pipeline, the fluid flowing through the user's pipeline will generate impact force on the impeller inside the pipeline, and the impeller is only fixed on the plug rod by the shaft, causing the impeller to be impacted on the shaft. Therefore, when the liquid in the user's pipeline flows chaotically, the impeller will be impacted, and then pressure will be applied to the shaft, causing the shaft to bend, affecting the normal use of the impeller and the shaft. In addition, the impeller of the insertion flowmeter should be inserted at the average flow velocity of the pipeline in the pipeline. By measuring the local flow velocity of the fluid at this point, the flow value in the pipeline is calculated based on the flow velocity distribution of the medium in the pipeline and the geometric parameters of the instrument and the pipeline. The axis position of the pipeline is usually considered to be the average flow velocity of the pipeline. For this purpose, the impeller of the insertion flowmeter needs to be placed on the axis position of the pipeline. However, due to the different diameters of various user pipelines, the impeller of the insertion flowmeter needs to meet the different insertion depths. In order to meet the requirements of the insertion flowmeter to adapt to various pipeline environments, the impeller of the insertion flowmeter needs to be adjustable. Therefore, there is room for improvement in the insertion type turbine flowmeter to reduce the pressure on the rotating shaft and facilitate the adjustment of the insertion depth of the impeller of the insertion type flowmeter so as to more widely apply and promote the insertion type flowmeter. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides an insertion-type turbine flowmeter which reduces the extrusion of the rotating shaft and facilitates adjustment of the insertion depth of the impeller, so as to overcome the defects in the prior art.

[0005] The technical scheme adopted by the utility model is: an insertion type turbine flowmeter, comprising a meter head, a plug rod vertically arranged below the meter head, and an impeller horizontally rotatably arranged at the bottom end of the plug rod, a fixing sleeve is arranged on the outer side of the plug rod, one end of the fixing sleeve is installed on the bottom side wall of the plug rod, the impeller is movably sleeved in the fixing sleeve, a fixing groove is opened at the bottom end of the plug rod, a through hole is opened on the side wall of the plug rod, the middle part of the through hole is connected to the fixing groove, a bearing is sleeved in the fixing groove, a rotating shaft is sleeved in the bearing, the rotating shaft is movably sleeved in the through hole, and the part of the rotating shaft passing through the through hole is installed on the impeller, the top of the plug rod is sleeved with a connecting sleeve, the top of the connecting sleeve and the bottom of the meter head are respectively provided with flanges, the meter head is connected to the connecting sleeve through the flange, a connecting plate is sleeved in the connecting sleeve, the connecting plate is installed in the connecting sleeve, a sleeve hole is opened in the middle of the connecting plate, the plug rod is movably sleeved in the sleeve hole, nuts are respectively arranged on both sides of the connecting plate, the nuts are threadedly sleeved on the plug rod, and the plug rod is clamped on the connecting plate through the nuts.

[0006] Preferably, the connecting plate is installed on the top of the connecting sleeve, the nut above the connecting plate is located in the header, a support block is provided below the connecting plate, the support block and the connecting plate are an integrated structure, a support groove is provided on the support block, the inner cavity structure of the support groove is consistent with the external shape of the nut, and the nut below the connecting plate is movably sleeved in the support groove.

[0007] Preferably, a sealing cover is movably sleeved on the insertion rod, a sealing ring is arranged at the bottom of the sealing cover, the sealing ring and the sealing cover are of an integral structure, the outer diameter of the sealing ring is not less than the outer diameter of the sealing cover, a plurality of fixing blocks are arranged on the bottom surface of the sealing ring, the plurality of fixing blocks are equidistantly installed on the sealing ring along the circumferential direction of the sealing ring, the sealing cover is threadedly sleeved on the bottom end of the connecting sleeve, and two first sealing rings made of an elastic material are arranged between the sealing cover and the nut below the connecting plate. Both of the two first sealing rings are press-fitted on the insertion rod, the two first sealing rings are respectively in contact with the sealing cover and the nut below the connecting plate, a sealing filler is arranged between the two first sealing rings, and the sealing filler is pressed in the inner cavity of the connecting sleeve through the two first sealing rings.

[0008] Preferably, a sealing groove is formed in the outer wall of the connecting sleeve, the sealing groove adopts an annular groove structure, and a second sealing ring is press-fitted in the sealing groove. The outer diameter of the second sealing ring is not less than the outer diameter of the connecting sleeve.

[0009] Preferably, limiting grooves are respectively formed in both sides of the outer wall of the connecting sleeve, and the limiting grooves are located above the sealing groove.

[0010] Preferably, a positioning strip is arranged on the insertion rod, the positioning strip is installed at the top end of the insertion rod, and the positioning strip is parallel to the rotating shaft; the central axes of the rotating shaft, the impeller, the through hole and the fixed sleeve are all on the same axis, and the inner cavity diameter of the fixed sleeve is matched with the diameter of the impeller.

[0011] Preferably, a constraint block is arranged below the bearing, the constraint block is sleeved in the fixed groove, the constraint block is fixed on the insertion rod by screws, the top surface of the constraint block is in contact with the bottom of the bearing, the bottom surface shape of the bearing is matched with the top surface shape of the constraint block, constraint grooves are respectively formed in the top and bottom of the bearing, a constraint strip is movably sleeved in the constraint groove, the shape of the constraint strip is matched with the inner cavity shape of the constraint groove, and the constraint strip is installed on the side wall of the fixed groove or the top surface of the constraint block.

[0012] Preferably, the distance from the end of the impeller far away from the insertion rod to the axis of the insertion rod is not greater than the outer diameter of the connecting sleeve, and the end of the impeller far away from the insertion rod is located outside the end of the fixed sleeve far away from the insertion rod.

[0013] The beneficial effects of the present utility model are as follows: First, the fixed sleeve provided in the present utility model limits and supports the outer side of the impeller, reducing the extrusion on the rotating shaft. At the same time, the phenomenon of the impeller shaking is reduced, so as to improve the accuracy of flow detection. Moreover, through the connecting plate and nut provided in the present utility model, the inserting rod can be clamped on the connecting plate. By rotating the nut, it is convenient to adjust the position of the inserting rod clamped on the connecting rod, so as to adjust the position of the impeller inserted into the user pipeline, thus facilitating the placement of the impeller at the average flow velocity of the pipeline, and facilitating the installation of the present utility model on user pipelines with various pipe diameters.

[0014] Second, by installing the connecting plate on the top of the connecting sleeve, when the nut above the connecting plate contacts the connecting plate, the nut above the connecting plate is located inside the meter head, so as to avoid the side wall of the connecting sleeve blocking the nut above the connecting plate, thus facilitating the tightening of the nut above the connecting plate on the inserting rod. By providing a support block on the connecting plate and a support groove on the support block, it is convenient to restrain the nut below the connecting plate, so as to improve the stability of clamping the inserting rod. Moreover, through the provided sealing cover, the first sealing ring and the sealing filler are pressed on the nut below the connecting plate, thereby using the first sealing ring and the sealing filler to seal the gap between the inserting rod and the connecting sleeve, so as to prevent the fluid flowing through in the user pipeline from flowing out through the gap between the inserting rod and the connecting sleeve. By setting the pushing and pulling fixed block, the sealing cover and the sealing ring can be driven to rotate on the inserting rod, so as to facilitate the decoration of the sealing cover and the sealing ring. By providing the second sealing ring, the gap between the connecting sleeve and the prefabricated hole of the user pipeline is sealed, so as to prevent the fluid flowing through in the user pipeline from flowing out through the gap between the connecting sleeve and the user pipeline.

[0015] Third, through the limiting groove provided on the connecting sleeve, by inserting the fixing plate into the limiting groove and fixing the fixing plate to the user pipeline, the rotation of the connecting sleeve can be restricted, so as to prevent the connecting sleeve from rotating. Since the positioning strip is parallel to the rotating shaft, by observing the orientation of the positioning strip, the orientation of the rotating shaft can be judged, so as to facilitate the adjustment of the rotating shaft to be parallel to the user pipeline. Moreover, through the provided restraint block and restraint strip, the bearing is clamped on the inserting rod, which is convenient for the loading and unloading of the bearing, so as to facilitate the maintenance of the bearing, the rotating shaft and the impeller. Description of the Drawings

[0016] Figure 1 It is a structural schematic diagram of the present utility model.

[0017] Figure 2 It is the first three-dimensional exploded view of the present utility model.

[0018] Figure 3 It is the second three-dimensional exploded view of the present utility model.

[0019] Figure 4 This is an assembly sectional view of the insertion rod, impeller and connecting sleeve in the present utility model.

[0020] Figure 5 This is a usage state diagram of the present utility model installed in a user pipeline.

[0021] Figure 6 This is an assembly explosion diagram of the present utility model and a user pipeline. Specific embodiments

[0022] As Figures 1 to 6 shown, an insertion type turbine flowmeter includes a meter head 1, an insertion rod 2 vertically arranged below the meter head 1, and an impeller 3 horizontally rotatably arranged at the bottom end of the insertion rod 2. A fixing sleeve 4 is arranged outside the insertion rod 2. One end of the fixing sleeve 4 is installed on the bottom side wall of the insertion rod 2. The impeller 3 is movably sleeved in the fixing sleeve 4. A fixing groove 5 is opened at the bottom end of the insertion rod 2. A through hole 6 is opened on the side wall of the insertion rod 2. The middle of the through hole 6 is communicated with the fixing groove 5. A bearing 7 is sleeved in the fixing groove 5. A rotating shaft 8 is sleeved in the bearing 7. The outer ring of the bearing 7 is installed on the insertion rod 2. The inner ring of the bearing 7 is installed on the rotating shaft 8. The rotating shaft 8 is movably sleeved in the through hole 6. The part of the rotating shaft 8 extending out of the through hole 6 is installed on the impeller 3, so that the fixing sleeve 4 limits and supports the impeller 3 to reduce the extrusion on the rotating shaft 8. A connecting sleeve 9 is sleeved on the top of the insertion rod 2. Flange plates 10 are respectively arranged on the top of the connecting sleeve 9 and the bottom of the meter head 1. The meter head 1 is connected with the connecting sleeve 9 through the flange plates 10. A connecting plate 11 is sleeved in the connecting sleeve 9. The connecting plate 11 is installed in the connecting sleeve 9. The diameter of the connecting plate 11 matches the inner diameter of the connecting sleeve 9. A sleeve hole 12 is opened in the middle of the connecting plate 11. The insertion rod 2 is movably sleeved on the sleeve hole 12. Nuts 13 are respectively arranged on both sides of the connecting plate 11. The nuts 13 are threadedly sleeved on the insertion rod 2. The insertion rod 2 is clamped on the connecting plate 11 through the nuts 13. By turning the nuts 13, the position of the insertion rod 2 clamped on the connecting plate 11 can be adjusted to conveniently adjust the installation position of the insertion rod 2 on the fixing sleeve 4, so as to conveniently adjust the position of the bottom end of the insertion rod 2 inserted into the user pipeline, that is, adjust the positions of the fixing sleeve 4 and the impeller 3 in the user pipeline, so as to facilitate the installation of the present utility model on user pipelines with various pipe diameters.

[0023] In this embodiment, the connecting plate 11 is installed on the top of the connecting sleeve 9. The nut 13 above the connecting plate 11 is located inside the meter head 1, so as to prevent the side wall of the connecting sleeve 9 from blocking the nut 13 above the connecting plate 11, facilitating the screwing of the nut 13 above the connecting plate 11. A support block 14 is provided below the connecting plate 11. The support block 14 and the connecting plate 11 are of an integral structure. A support groove 15 is formed on the support block 14. The inner cavity structure of the support groove 15 matches the external shape of the nut 13. The nut 13 below the connecting plate 11 is movably sleeved in the support groove 15, thereby restricting the nut 13 below the connecting plate 11 and improving the stability of clamping the insertion rod 2.

[0024] Please refer to again Figure 4 , a sealing cover 16 is movably sleeved on the insertion rod 2. A sealing ring 17 is provided at the bottom of the sealing cover 16. The sealing ring 17 and the sealing cover 16 are of an integral structure. The external diameter of the sealing ring 17 is not less than the external diameter of the sealing cover 16. A plurality of fixing blocks 18 are provided on the bottom surface of the sealing ring 17. The plurality of fixing blocks 18 are equidistantly installed on the sealing ring 17 along the circumferential direction of the sealing ring 17. The sealing cover 16 is threadedly sleeved on the bottom end of the connecting sleeve 9. The external diameter of the sealing cover 16 matches the inner cavity diameter of the connecting sleeve 9. Two first sealing rings 19 made of an elastic material are provided between the sealing cover 16 and the nut 13 below the connecting plate 11. The two first sealing rings 19 are both press-fitted on the insertion rod 2. The two first sealing rings 19 are respectively in contact with the sealing cover 16 and the nut 13 below the connecting plate 11. A sealing filler 20 is provided between the two first sealing rings 19. The sealing filler 20 is pressed in the inner cavity of the connecting sleeve 9 through the two first sealing rings 19. Through the pre-tightening or intermediate action of the two first sealing rings 19, a sealing effect of generating a pressing force between the sealing filler 20 and the insertion rod 2 is achieved. The matrix material of the sealing filler 20 is made of asbestos fiber, fluorine fiber, carbon fiber, etc., thereby sealing the gap between the insertion rod 2 and the connecting sleeve 9 to prevent the fluid flowing through the user pipeline from flowing out through the gap between the insertion rod 2 and the connecting sleeve 9.

[0025] Specifically, a sealing groove 21 is formed on the outer wall of the connecting sleeve 9. The sealing groove 21 adopts an annular groove structure. A second sealing ring 22 is press-fitted in the sealing groove 21. The external diameter of the second sealing ring 22 is not less than the external diameter of the connecting sleeve 9. The second sealing ring 22 is used to seal the gap between the connecting sleeve 9 and the prefabricated hole of the user pipeline to prevent the fluid flowing through the user pipeline from flowing out through the gap between the connecting sleeve 9 and the user pipeline.

[0026] In this embodiment, limiting grooves 23 are respectively formed on both sides of the outer wall of the connecting sleeve 9. The limiting grooves 23 are located above the sealing groove 21. Please refer to again Figure 6, insert the fixing plate into the limiting groove 23 and fix the fixing plate to the user pipeline to restrict the rotation of the connecting sleeve 9 and prevent the connecting sleeve 9 from rotating.

[0027] Please refer to again Figure 2 and 4 , a positioning strip 24 is arranged on the inserting rod 2, the positioning strip 24 is installed at the top end of the inserting rod 2, and the positioning strip 24 is parallel to the rotating shaft 8. Thus, by observing the orientation of the positioning strip 24, it is convenient to judge the orientation of the rotating shaft 8. The central axes of the rotating shaft 8, the impeller 3, the through hole 6 and the fixing sleeve 4 are all located on the same axis, and the inner cavity diameter of the fixing sleeve 4 coincides with the diameter of the impeller 3, so as to facilitate the use of the fixing sleeve 8 to support and limit the impeller 3.

[0028] In this embodiment, a restraining block 25 is arranged below the bearing 7. The restraining block 25 is sleeved in the fixing groove 5 and fixed to the inserting rod 2 by screws. The top surface of the restraining block 25 is in contact with the bottom of the bearing 7. The shape of the bottom surface of the bearing 7 coincides with the shape of the top surface of the restraining block 25. Restraining grooves 26 are respectively formed in the top and bottom of the bearing 7. A restraining strip 27 is movably sleeved in the restraining groove 26. The shape of the restraining strip 27 coincides with the inner cavity shape of the restraining groove 26. The restraining strip 27 is installed on the side wall of the fixing groove 5 or the top surface of the restraining block 25. The inner ring of the bearing 7 is press-fitted on the rotating shaft 8, so as to clamp the bearing 7 on the inserting rod 2, and the outer ring of the bearing 7 is installed on the inserting rod 2, so as to facilitate the loading and unloading of the bearing 7 and facilitate the maintenance of the bearing 7, the rotating shaft 8 and the impeller 3.

[0029] Specifically, the distance from the end of the impeller 3 far away from the inserting rod 2 to the axis of the inserting rod 2 is not greater than the outer diameter of the connecting sleeve 9, so as to facilitate the insertion of the impeller 3 and the inserting rod 2 into the user pipeline together through the reserved hole of the user pipeline. The end of the impeller 3 far away from the inserting rod 2 is located outside the end of the fixing sleeve 4 far away from the inserting rod 2, so that the fluid flowing through the user pipeline can drive the impeller 3 to rotate.

[0030] The assembly method of this product is as follows: As Figures 1 to 6As shown in the figure, first, the sealing cover 16 and two first sealing rings 19 are successively sleeved on the insertion rod 2. According to the diameter of the user's pipeline, one of the nuts 13 is screwed onto the insertion rod 2 so that the axial distance from the end of the nut 13 away from the perforation 6 to the axis of the perforation 6 matches the radius of the user's pipeline, and the first sealing ring 19 close to the nut 13 is closely attached to the nut 13. Next, the second sealing ring 22 is press-fitted onto the sealing groove 21, and the insertion rod 2 is inserted into the connecting sleeve 9 so that the nut 13 is sleeved in the support groove 15 and the top of the insertion rod 2 passes through the sleeve hole 12. Another nut 3 is taken out and screwed onto the top of the insertion rod 2 so that the insertion rod 2 is clamped on the connecting plate 11 by the nut 13. Then, the sealing filler 20 is filled between the two first sealing rings 19. By rotating the fixing block 18, the sealing cover 16 is rotated into the connecting sleeve 9, thereby squeezing the sealing filler 20 between the two first sealing rings 19. Then, the impeller 3 is installed on one end of the rotating shaft 8, and the bearing 7 is placed in the fixing groove 5 so that the restraint groove 26 at the top of the bearing 7 is sleeved on the restraint bar 27 on the side wall of the fixing groove 5. Then, the rotating shaft 8 is inserted into the perforation 6 and the bearing 7 so that the impeller 3 is movably sleeved in the fixing sleeve 4. Finally, the restraint bar 27 on the restraint block 25 is sleeved in the restraint groove 26, and the restraint block 25 is installed on the insertion rod 2 by screws, thereby restricting the bearing 7 in the fixing groove 5. The flange 10 of the meter head 1 and the flange 10 of the connecting sleeve 9 are installed together by screws so that the meter head 1 is parallel to the positioning bar 24 to complete the assembly of the product. It should be noted that when the product is assembled to the user's pipeline, the meter head 1 should be parallel to the axis of the user's pipeline for convenient use of the product.

[0031] In this embodiment, the fixing sleeve 4 is provided to limit and support the outside of the impeller 3, reducing the extrusion force on the rotating shaft 8. At the same time, the phenomenon of the impeller 3 shaking is reduced to improve the accuracy of flow detection. Moreover, in this embodiment, through the connecting plate 11 and the nut 13 provided, the insertion rod 2 can be clamped on the connecting plate 11. By rotating the nut 13, it is convenient to adjust the position of the insertion rod 2 clamped on the connecting rod 11, so as to conveniently adjust the position of the impeller 3 inserted into the user's pipeline, thereby facilitating the placement of the impeller 3 at the average flow velocity of the pipeline, so as to facilitate the installation of the present utility model on user pipelines with various diameters.

[0032] The above-described embodiments are only the preferred embodiments of the present utility model and do not limit the scope of implementation of the present utility model. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the present utility model patent should be included in the scope of the patent application of the present utility model.

Claims

1. An insertion type turbine flowmeter, comprising a meter head (1), a plug rod (2) vertically arranged below the meter head (1), and an impeller (3) horizontally rotatably arranged at the bottom end of the plug rod (2), characterized in that: A fixing sleeve (4) is arranged on the outer side of the inserting rod (2). One end of the fixing sleeve (4) is installed on the bottom side wall of the inserting rod (2). The impeller (3) is movably sleeved in the fixing sleeve (4). A fixing groove (5) is formed at the bottom end of the inserting rod (2). A perforation (6) is formed in the side wall of the inserting rod (2). The middle part of the perforation (6) communicates with the fixing groove (5). A bearing (7) is sleeved in the fixing groove (5). A rotating shaft (8) is sleeved in the bearing (7). The rotating shaft (8) is movably sleeved in the perforation (6). The part of the rotating shaft (8) extending out of the perforation (6) is installed on the impeller (3). A connecting sleeve (9) is sleeved on the top of the inserting rod (2). Flange plates (10) are respectively arranged on the top of the connecting sleeve (9) and the bottom of the meter head (1). The meter head (1) is connected to the connecting sleeve (9) through the flange plates (10). A connecting plate (11) is sleeved in the connecting sleeve (9). The connecting plate (11) is installed in the connecting sleeve (9). A sleeve hole (12) is formed in the middle of the connecting plate (11). The inserting rod (2) is movably sleeved in the sleeve hole (12). Nuts (13) are respectively arranged on both sides of the connecting plate (11). The nuts (13) are threadedly sleeved on the inserting rod (2). The inserting rod (2) is clamped on the connecting plate (11) through the nuts (13).

2. The insertion type turbine flowmeter according to claim 1, wherein: The connecting plate (11) is installed on the top of the connecting sleeve (9). The nut (13) above the connecting plate (11) is located inside the meter head (1). A support block (14) is arranged below the connecting plate (11). The support block (14) and the connecting plate (11) are of an integral structure. A support groove (15) is formed in the support block (14). The inner cavity structure of the support groove (15) matches the outer shape of the nut (13). The nut (13) below the connecting plate (11) is movably sleeved in the support groove (15).

3. The insertion type turbine flowmeter according to claim 1, characterized in that: A sealing cover (16) is movably sleeved on the inserting rod (2). A sealing ring (17) is arranged at the bottom of the sealing cover (16). The sealing ring (17) and the sealing cover (16) are of an integral structure. The outer diameter of the sealing ring (17) is not less than the outer diameter of the sealing cover (16). A plurality of fixing blocks (18) are arranged on the bottom surface of the sealing ring (17). The plurality of fixing blocks (18) are equidistantly installed on the sealing ring (17) along the circumferential direction of the sealing ring (17). The sealing cover (16) is threadedly sleeved on the bottom end of the connecting sleeve (9). Two first sealing rings (19) made of an elastic material are arranged between the sealing cover (16) and the nut (13) below the connecting plate (11). The two first sealing rings (19) are both installed on the inserting rod (2) with an interference fit. The two first sealing rings (19) are respectively in contact with the sealing cover (16) and the nut (13) below the connecting plate (11). A sealing filler (20) is arranged between the two first sealing rings (19). The sealing filler (20) is pressed in the inner cavity of the connecting sleeve (9) through the two first sealing rings (19).

4. The plug-in turbine flowmeter according to claim 1, wherein: The outer wall of the connecting sleeve (9) is provided with a sealing groove (21). The sealing groove (21) adopts an annular groove structure, and a second sealing ring (22) is installed in the sealing groove (21) by interference fit. The outer diameter of the second sealing ring (22) is not less than the outer diameter of the connecting sleeve (9).

5. The insertable turbine flowmeter according to claim 4, wherein: On both sides of the outer wall of the connecting sleeve (9), limiting grooves (23) are respectively provided. The limiting grooves (23) are located above the sealing groove (21).

6. The insertion type turbine flowmeter according to claim 1, wherein: A positioning strip (24) is arranged on the inserting rod (2). The positioning strip (24) is installed at the top end of the inserting rod (2), and the positioning strip (24) is parallel to the rotating shaft (8); the central axes of the rotating shaft (8), the impeller (3), the perforation (6) and the fixing sleeve (4) are all on the same axis, and the inner cavity diameter of the fixing sleeve (4) is matched with the diameter of the impeller (3).

7. The insertion type turbine flowmeter according to claim 1, wherein: A restraint block (25) is arranged below the bearing (7). The restraint block (25) is sleeved in the fixing groove (5), and the restraint block (25) is fixed to the inserting rod (2) by screws. The top surface of the restraint block (25) is in contact with the bottom of the bearing (7), and the bottom surface shape of the bearing (7) is matched with the top surface shape of the restraint block (25). Restraint grooves (26) are respectively provided at the top and bottom of the bearing (7), and a restraint strip (27) is movably sleeved in the restraint grooves (26). The shape of the restraint strip (27) is matched with the inner cavity shape of the restraint grooves (26), and the restraint strip (27) is installed on the side wall of the fixing groove (5) or the top surface of the restraint block (25).

8. The insertion type turbine flowmeter according to claim 1, characterized in that: The distance from the end of the impeller (3) far away from the inserting rod (2) to the axis of the inserting rod (2) is not greater than the outer diameter of the connecting sleeve (9), and the end of the impeller (3) far away from the inserting rod (2) is located outside the end of the fixing sleeve (4) far away from the inserting rod (2).

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