A vertical structure pump underwater shaft force measurement device and installation method thereof

Abstract

The present invention discloses an underwater shaft force measuring device for a vertical structure pump and an installation method thereof, comprising: a sensor bracket, the sensor bracket is arranged on the vertical pump and is a sealing structure; a movable support, the movable support is arranged in the sensor bracket and has a gap with the inner side of the sensor bracket; an internal bracket, the internal bracket is fixed on the upper side of the movable support; a force sensor, the two ends of the force sensor are respectively fixed on the second center hole and the third center hole; the second center hole, the third center hole and the thrust bearing are all coaxially arranged. By adopting this scheme, it is realized that the shaft force is converted into a quantity that can be directly measured underwater through structural design means without introducing other external forces, and the feasibility of the measurement method and the accuracy of the measurement data have been verified through experiments, which is of great significance for the research of vertical pumps.

Description

Technical Field

[0001] The invention relates to the technical field of axial force measurement, and in particular to an underwater shaft force measurement device for a vertical structure pump and an installation method thereof. Background Art

[0002] Pumps are widely used in various sectors of the national economy, and their technical performance has a huge impact on related industries. Vertical pumps are often the typical structure of high-lift, large-flow, and high-specific-speed pumps, so their design and hydraulic performance optimization are of great significance. However, since the internal flow of vertical pumps is a complex three-dimensional unsteady flow, the lack of understanding of its flow laws has seriously affected the improvement of pump performance and technological progress. In order to improve design efficiency and shorten design time, it is necessary to optimize parameters, among which shaft force is a key parameter of the pump.

[0003] The main shaft of the vertical structure pump relies on a set of thrust bearings to bear the axial force. The axial force mainly includes: shaft gravity (downward), shaft buoyancy (upward), fluid impact (downward), etc. The combined force of these forces determines the force of the thrust bearing. If the pump is under a large system pressure, the thrust bearing will bear a large shaft force. Too large a shaft force is not conducive to improving the life of the bearing. Therefore, the shaft force parameter has a great influence on the optimal design of the pump.

[0004] Taking a vertical axial flow pump as an example, the water-lubricated sliding thrust bearing is usually immersed in water. The conventional method of measuring shaft force is to lift the shaft and seal it, install a rolling thrust bearing in the air, and measure the shaft force through a force sensor. The advantages of this method are simple structure and easy implementation, but the disadvantages are also obvious. The introduction of the shaft seal structure and the additional force of the external thrust bearing causes shaft force measurement errors. At the same time, the shaft seal will bring additional friction torque, which affects the shaft rotation performance, especially under small driving torque and low speed conditions. Therefore, when measuring the shaft force, the stress state of the rotating parts in the pump must not be changed to ensure the reliability of the measurement. Summary of the invention

[0005] The present invention aims to solve the deficiencies of the prior art and to provide an underwater shaft force measuring device for a vertical structure pump and an installation method thereof. By adopting this scheme, the entire shaft system is lifted by a force sensor acting on a movable support, thereby realizing the conversion of the shaft force into an intuitively measurable quantity underwater through structural design without introducing other external forces. The feasibility of the measurement method and the accuracy of the measurement data have been verified through experiments, which is of great significance to the research on vertical pumps.

[0006] The present invention is achieved through the following technical solutions:

[0007] A device for measuring underwater shafting force of a vertical structure pump, comprising:

[0008] A sensor bracket, which is arranged on the vertical pump and has a sealing structure;

[0009] A movable support member, the movable support member is arranged in the sensor bracket and is detachably connected to the sensor bracket, and a gap is left between the movable support member and the inner side of the sensor bracket; a first center hole is provided in the middle of the movable support member, and the first center hole is used to install and position the thrust bearing;

[0010] An internal bracket, the internal bracket is fixedly arranged on the upper side of the movable support member, the internal bracket contains a cavity, and the end of the thrust bearing extending into the first center hole is located in the cavity;

[0011] The force sensor has a second center hole at the upper end of the internal bracket, a third center hole at the upper end of the sensor bracket, and two ends of the force sensor are respectively fixed to the second center hole and the third center hole; the second center hole, the third center hole and the thrust bearing are all coaxially arranged.

[0012] Compared with the prior art, the additional force of the shaft sealing structure and the external thrust bearing is introduced, resulting in errors in the measurement of the shaft force. At the same time, the shaft seal will bring additional friction torque, which will affect the shaft rotation performance, especially the problem that the impact on the working conditions with small driving torque and low speed is more obvious. The present invention provides an underwater shaft force measurement device for a vertical structure pump. In the specific scheme, it includes a sensor bracket, which is located at the end of the vertical pump shaft, and its interior is a sealed space to prevent water from entering and affecting the measurement accuracy; a movable support and an internal bracket are provided in the sealed space, and the movable support is annular, and a gap is left between the circumferential end portions and the inner side of the sensor bracket. After the movable support is leveled, the movable support and the inner side of the sensor bracket can be connected by a detachable connection method such as a plurality of cylindrical pins. A first center hole is opened at the center position of the movable support, and the first center hole has a step, so that a positioning thrust bearing can be installed at the first center hole, and the end of the thrust bearing The part extends from the lower end of the first center hole into the sealed space. At this time, when the shaft rotates, due to the gap between the movable support and the sensor bracket, it is ensured that no additional friction is introduced. The positioning is performed by the pins and the side walls, and the movable support is prevented from rotating with the bearing. The internal bracket is installed on the upper side of the movable support, and a cavity is contained in the internal bracket. The end of the thrust bearing extends into the cavity. Subsequently, a force sensor is installed between the upper end of the internal bracket and the upper end of the sensor bracket. The upper end is connected to the third center hole, and the lower end is connected to the second center hole. At this time, the force sensor is fixed in the sealed space, and the internal bracket, the movable support and the thrust bearing form a hanging component, so that the force sensor lifts the entire hanging component, which is convenient for the force sensor to measure. In the specific installation process, the concentricity of the third center hole and the second center hole must be ensured. During installation, the entire hanging component only needs to be arranged in the center, so that the shaft system is hung by a force sensor to measure the shaft system force.

[0013] The above is intended to achieve: without affecting the operation of the pump, the shaft force of the vertical pump can be converted into a measurable quantity when the bearing is submerged, providing test data support for the optimal design of the pump. Secondly, according to the actual installation process, it can be clearly obtained that this measurement method does not introduce other external forces during measurement, and can accurately obtain the shaft force without additional force during the test, ensuring the reasonable and reliable measurement data of the shaft force.

[0014] Further optimization, the sensor bracket includes an external bracket and a fixed support member, the external bracket is installed on the vertical pump through the fixed support member, and the third center hole is opened at the upper end of the external bracket; the sensor bracket is divided into an external bracket and a fixed support member, and the external bracket, the fixed support member and the vertical pump are connected in sequence from top to bottom. Through the segmented design, it is possible to achieve a segmented detachable connection while more conveniently installing the mobile support member.

[0015] Further optimized, the side wall of the fixed support member is provided with a sensor wire sealing structure, and the sensor wire sealing structure is used to lead out the force sensor lead wire; and is used to lead out and seal the force sensor lead wire.

[0016] Further optimization is performed, an exhaust valve is installed on the external bracket; wherein the exhaust valve is used to exhaust the internal gas.

[0017] Further optimization, the outer side surfaces of the lower end of the external bracket, the upper and lower ends of the fixed support member, and the lower end of the internal bracket all extend outwardly with annular connecting ends, and a plurality of threaded through holes are evenly distributed in the circumferential direction of the annular connecting ends. The external bracket and the fixed support member, the fixed support member and the vertical pump, and the internal bracket and the movable support member are all connected by bolts; so as to reserve internal installation space.

[0018] Further optimization is performed by providing O-rings between the lower end of the external bracket and the upper end of the fixed support, between the fixed support and the vertical pump, and between the force sensor and the third center hole of the external bracket; the internal space is sealed by the O-rings.

[0019] Further optimization, the upper and lower ends of the force sensor are respectively provided with an upper connecting piece and a lower connecting piece, the upper connecting piece extends out of the third center hole and is threadedly connected to an upper plate nut, and the lower connecting piece extends out of the second center hole and is threadedly connected to a lower plate nut; for realizing a detachable connection of the force sensor.

[0020] Further optimization is that a plurality of through holes are provided on the peripheral side of the internal bracket, and the cavity is connected with the interior of the sensor bracket through the through holes; the interior of the sealed space is connected as a whole through the through holes, so that the exhaust valve can discharge the entire internal gas.

[0021] Further optimized, the side surface of the movable support is connected to the inner side of the sensor bracket through a pin.

[0022] Further optimization, a method for installing a vertical structure pump underwater shaft force measurement device, the method comprising the following steps:

[0023] S1: hoist the device shaft and fix it at the bottom;

[0024] S2: Insert an O-ring into the end of the vertical pump and connect the fixed support to the end of the vertical pump;

[0025] S3: vertically hoist the movable support, connect the side of the movable support and the fixed support with pins, and level them;

[0026] S4: Install the thrust bearing and position it through the first center hole of the movable support, and then screw a hexagonal nut into the upper end of the thrust bearing to fix it;

[0027] S5: The internal bracket and the force sensor are locked and fixed by the lower plate nut; then the internal bracket is installed into the fixed support member and fixed to the movable support member so that the first center hole and the third center hole are aligned;

[0028] S6: Install the external bracket on the upper end of the fixed support member, align the third center hole with the second center hole, and then install an O-ring on the external bracket and the fixed support member bracket;

[0029] S7: Connect the force sensor to the upper end of the external bracket and ensure that the axis is vertical, install an O-ring between the force sensor and the third center hole, and then tighten the upper plate nut on the end of the force sensor extending out of the third center hole.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] The present invention provides an underwater shaft force measurement device for a vertical structure pump and an installation method thereof. According to this scheme, a movable support is used at the upper thrust bearing to lift the entire shaft system, and then a force sensor acts on the movable support to lift the entire shaft system. The force sensor lead is led out and then sealed, thereby obtaining the entire shaft force. This design idea realizes the conversion of shaft force into an intuitively measurable quantity underwater through structural design means without introducing other external forces, and the feasibility of the measurement method and the accuracy of the measurement data have been verified through experiments, which is of great significance for the research of vertical pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0033] Figure 1 A schematic diagram of the structure of an embodiment provided by the present invention;

[0034] Figure 2 A cross-sectional view of an internal support of an embodiment provided by the present invention;

[0035] Figure 3 A top view of an internal bracket of an embodiment provided by the present invention;

[0036] Figure 4 A cross-sectional view of an external support provided by an embodiment of the present invention;

[0037] Figure 5 A top view of an external bracket according to an embodiment of the present invention.

[0038] Marks and corresponding parts names in the attached drawings:

[0039] 1-external bracket, 2-movable support, 3-thrust bearing, 4-internal bracket, 5-fixed support, 6-lower plate nut, 7-sensor line sealing structure, 8-exhaust valve, 9-bolt, 10-upper connecting piece, 11-lower connecting piece, 12-upper plate nut. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0041] Example 1

[0042] This embodiment 1 provides a device for measuring the underwater shaft force of a vertical structure pump, such as Figures 1 to 5 As shown, it includes: a sensor bracket, which is arranged on a vertical pump and is a sealing structure;

[0043] A movable support 2, wherein the movable support 2 is disposed in the sensor bracket and is detachably connected to the sensor bracket, and a gap is left between the movable support 2 and the inner side of the sensor bracket; a first center hole is provided in the middle of the movable support 2, and the first center hole is used to install and position the thrust bearing 3;

[0044] An internal bracket 4, wherein the internal bracket 4 is fixedly mounted on the upper side of the movable support 2, the internal bracket 4 contains a cavity, and the end of the thrust bearing 3 extending into the first center hole is located in the cavity;

[0045] The force sensor has a second center hole at the upper end of the internal bracket 4, and a third center hole at the upper end of the sensor bracket. Both ends of the force sensor are fixedly connected to the second center hole and the third center hole respectively; the second center hole, the third center hole and the thrust bearing 3 are all coaxially arranged.

[0046] Compared with the prior art, the additional force of the shaft sealing structure and the external thrust bearing 3 is introduced, resulting in errors in the measurement of the shaft force. At the same time, the shaft seal will bring additional friction torque, which will affect the shaft rotation performance, especially the problem that the impact on the working conditions with small driving torque and low speed is more obvious. The present scheme provides an underwater shaft force measurement device for a vertical structure pump. In the specific scheme, it includes a sensor bracket, which is located at the end of the vertical pump shaft, and its interior is a sealed space to prevent water from entering and affecting the measurement accuracy; a movable support 2 and an internal bracket 4 are provided in the sealed space, and the movable support 2 is annular, and a gap is left between its circumferential end and the inner side of the sensor bracket. After the movable support 2 is leveled, the movable support 2 and the inner side of the sensor bracket can be connected by a detachable connection method such as a plurality of cylindrical pins. A first center hole is opened at the center position of the movable support 2, and the first center hole has a step, so that a positioning thrust bearing 3 can be installed at the first center hole, and the end of the thrust bearing 3 is from the first The lower end of a center hole extends into the sealed space. At this time, when the shaft rotates, due to the gap between the movable support 2 and the sensor bracket, it is ensured that no additional friction is introduced. The positioning is performed by the pins and the side walls, and the movable support 2 is prevented from rotating with the bearing. The internal bracket 4 is installed on the upper side of the movable support 2, and the internal bracket 4 contains a cavity. The end of the thrust bearing 3 extends into the cavity. Subsequently, a force sensor is installed between the upper end of the internal bracket 4 and the upper end of the sensor bracket. The upper end is connected to the third center hole, and the lower end is connected to the second center hole. At this time, the force sensor is fixed in the sealed space, and the internal bracket 4, the movable support 2 and the thrust bearing 3 form a hanging component, so that the force sensor lifts the entire hanging component, thereby facilitating the force sensor on the force sensor to measure. In the specific installation process, the concentricity of the third center hole and the second center hole must be ensured. During installation, the entire hanging component only needs to be arranged in the center, so that the shaft system is hung by a force sensor to measure the shaft system force.

[0047] The above is intended to achieve: without affecting the operation of the pump, the shaft force of the vertical pump can be converted into a measurable quantity when the bearing is submerged, providing test data support for the optimal design of the pump. Secondly, according to the actual installation process, it can be clearly obtained that this measurement method does not introduce other external forces during measurement, and can accurately obtain the shaft force without additional force during the test, ensuring the reasonable and reliable measurement data of the shaft force.

[0048] See also Figure 1In this embodiment, the sensor bracket includes an external bracket 1 and a fixed support member 5, the external bracket 1 is installed on the vertical pump through the fixed support member 5, and the third center hole is opened at the upper end of the external bracket 1; the sensor bracket is divided into the external bracket 1 and the fixed support member 5, and the external bracket 1, the fixed support member 5 and the vertical pump are connected in sequence from top to bottom. Through the segmented design, it is possible to achieve a segmented detachable connection while more conveniently installing the movable support member 2.

[0049] Please continue reading Figure 1 As a specific implementation method for leading out and sealing the lead wire of the force sensor, it is configured as follows: a sensor wire sealing structure 7 is provided on the side wall of the fixed support member 5, and the sensor wire sealing structure 7 is used to lead out the lead wire of the force sensor;

[0050] It can be understood that a sensor line sealing structure 7 is provided on the outer side of the fixed support member 5, wherein the sensor line sealing structure 7 is a conventional design in the prior art and is not limited here. Figure 1 As shown, an internal threaded sleeve is arranged outside the fixed support member 5, and a sealing flexible member is arranged at the bottom of the internal threaded sleeve. After the lead wire is led out, the hexagonal bolt 9 and the internal threaded sleeve are threadedly connected and tightened to compress the sealing flexible member, thereby achieving sealing.

[0051] In this embodiment, an exhaust valve 8 is installed on the external bracket 1; wherein the exhaust valve 8 is used to exhaust the internal gas.

[0052] As a specific implementation method for leaving an internal installation space, it is set as follows: the outer side surfaces of the lower end of the external bracket 1, the upper and lower ends of the fixed support 5, and the lower end of the internal bracket 4 all extend outward with an annular connecting end, and a plurality of threaded through holes are evenly distributed in the circumferential direction of the annular connecting end, and the external bracket 1 and the fixed support 5, the fixed support 5 and the vertical pump, and the internal bracket 4 and the movable support 2 are all connected by bolts 9;

[0053] It can be understood that annular connecting ends are extended from the outer side surfaces of the external bracket 1, the upper and lower ends of the fixed support member 5, and the lower end of the internal bracket 4. The annular connecting end of the external bracket 1 and the annular connecting end of the upper end of the fixed support member 5 fit each other, and a trapezoidal contact surface is set on the fitting surface, so as to achieve a tight connection, and then the hexagonal bolt 9 is installed; the lower end of the fixed support member 5 and the annular connecting end are located at the end of the vertical pump shaft, and a trapezoidal contact surface is set, and then the hexagonal bolt 9 is installed; the annular connecting end of the internal bracket 4 is located on the movable support member 2, and then the hexagonal bolt 9 is installed; the above scheme realizes a detachable connection.

[0054] As a specific implementation method for achieving internal space sealing, it is configured as follows: O-rings are provided between the lower end of the external bracket 1 and the upper end of the fixed support 5, between the fixed support 5 and the vertical pump, and between the force sensor and the third center hole of the external bracket 1.

[0055] As a specific implementation method for realizing a detachable connection of a force sensor, it is configured as follows: the upper and lower ends of the force sensor are respectively provided with an upper connecting member 10 and a lower connecting member 11, the upper connecting member 10 extends out of the third center hole and is threadedly connected with an upper plate nut 12, and the lower connecting member 11 extends out of the second center hole and is threadedly connected with a lower plate nut 6;

[0056] It can be understood that the force sensor is fixed with threaded connectors at its upper and lower ends, and the ends of the threaded connectors are provided with screws. The screw at the upper end passes through the third center hole, and then the upper plate nut 12 is put on the screw and fixed after tightening; the screw at the lower end passes through the second center hole, and is put on the upper and lower plate nuts 6, and fixed after tightening; the second center hole has a step, so that the lower plate nut 6 is located in the second step through hole to avoid affecting the operation of the thrust bearing 3.

[0057] As a redundant solution, in this embodiment, a plurality of through holes are provided on the periphery of the internal bracket 4, and the cavity is connected with the interior of the sensor bracket through the through holes; the interior of the sealed space is connected as a whole through the through holes, so that the exhaust valve 8 can discharge the entire internal gas.

[0058] As a redundant solution, in this embodiment, the side surface of the movable support 2 is connected to the inner side of the sensor bracket through a pin.

[0059] Example 2

[0060] This embodiment 2 provides a method for installing an underwater shaft force measurement device for a vertical structure pump, the method comprising the following steps:

[0061] S1: hoist the device shaft and fix it at the bottom;

[0062] S2: insert an O-ring into the end of the vertical pump, and connect the fixed support 5 to the end of the vertical pump;

[0063] S3: vertically hoist the movable support 2, connect the side of the movable support 2 and the fixed support 5 through pins, and level them;

[0064] S4: Install the thrust bearing 3 and position it through the first center hole of the movable support 2, and then screw a hexagonal nut into the upper end of the thrust bearing 3 to fix it;

[0065] S5: The internal bracket 4 and the force sensor are locked and fixed by the lower plate nut 6; then the internal bracket 4 is installed into the fixed support member 5 and fixed to the movable support member 2, so that the first center hole and the third center hole are aligned;

[0066] S6: Install the external bracket 1 on the upper end of the fixed support member 5, and align the third center hole with the second center hole, and then install an O-ring on the external bracket 1 and the fixed support member 5;

[0067] S7: Connect the force sensor to the upper end of the external bracket 1 and ensure that the axis is vertical, install an O-ring between the force sensor and the third center hole, and then tighten the upper plate nut 12 on the end of the force sensor extending out of the third center hole.

[0068] During the specific installation process, firstly, the device shaft is hoisted into the vertical pump and the shaft is fixed at the bottom; then, the O-ring is inserted into the device position ①, such as Figure 1 As shown in the figure, the fixed support 5 is then connected to the device by means of the hexagonal bolts 9; after connection, the movable support 2 is vertically hoisted in, and the side is limited by a cylindrical pin and leveled; after leveling and installation, the thrust bearing 3 is installed, and the thrust bearing 3 is positioned by the step hole of the movable support 2, and then the hexagonal nut is screwed in above the thrust bearing 3 disk to fix it; after the thrust bearing 3 is installed, the internal bracket 4 of the force sensor is locked and connected with the lower connecting piece 11 of the force sensor by means of the lower plate nut 6, and then the internal bracket 4 is installed into the fixed support 5 and fixed to the movable support 2, so that the first center hole and the third center hole are aligned; after the internal bracket 4 is installed, the third center hole of the external bracket 1 of the force sensor is aligned with the second center hole of the internal bracket 4, and then the external bracket 1 is installed, and in Figure 1 The position ② is sealed by an O-ring; then connect the upper connector 10 of the force sensor to the upper end of the external bracket 1, ensure that the shaft system is vertical, tighten the upper connector 10 of the sensor and the upper plate nut 12, and pay attention to the gap between the upper connector 10 and the upper plate during installation. Figure 1 Position ③ in the middle is also sealed by the O-ring. At this time, the entire device is installed and measurement begins.

[0069] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for measuring underwater shaft force of a vertical structure pump, characterized in that: include: A sensor bracket, which is arranged on the vertical pump and has a sealing structure; A movable support member (2), the movable support member (2) being arranged in the sensor bracket and being detachably connected to the sensor bracket, with a gap being left between the movable support member (2) and the inner side of the sensor bracket; a first center hole is provided in the middle of the movable support member (2), and the first center hole is used for installing and positioning a thrust bearing (3); An internal bracket (4), the internal bracket (4) being fixedly mounted on the upper side of the movable support member (2), the internal bracket (4) comprising a cavity, and the end of the thrust bearing (3) extending into the first central hole being located in the cavity; A force sensor, wherein the upper end of the internal bracket (4) is provided with a second center hole, the upper end of the sensor bracket is provided with a third center hole, and both ends of the force sensor are respectively fixedly connected to the second center hole and the third center hole; the second center hole, the third center hole and the thrust bearing are all coaxially arranged; The sensor bracket comprises an external bracket (1) and a fixed support member (5), the external bracket (1) is mounted on the vertical pump via the fixed support member (5), and the third center hole is opened at the upper end of the external bracket (1); The lower end of the external support (1), the upper and lower ends of the fixed support (5), and the outer side surfaces of the lower end of the internal support (4) all extend outwardly with an annular connection end, and a plurality of threaded through holes are evenly distributed in the circumferential direction of the annular connection end. The external support (1) and the fixed support (5), the fixed support (5) and the vertical pump, and the internal support (4) and the movable support (2) are all connected by bolts (9).

2. The device for measuring the underwater shafting force of a vertical structure pump according to claim 1 is characterized in that: A sensor wire sealing structure (7) is provided on the side wall of the fixed support member (5), and the sensor wire sealing structure (7) is used to lead out the force sensor lead wire.

3. The device for measuring underwater shafting force of a vertical structure pump according to claim 1, characterized in that: An exhaust valve (8) is mounted on the external bracket (1).

4. The device for measuring underwater shafting force of a vertical structure pump according to claim 1, characterized in that: O-rings are provided between the lower end of the external support (1) and the upper end of the fixed support (5), between the fixed support (5) and the vertical pump, and between the force sensor and the third center hole of the external support (1).

5. The device for measuring underwater shafting force of a vertical structure pump according to claim 1, characterized in that: The upper and lower ends of the force sensor are respectively provided with an upper connecting piece (10) and a lower connecting piece (11); the upper connecting piece (10) extends out of the third center hole and is threadedly connected to an upper plate nut (12); and the lower connecting piece (11) extends out of the second center hole and is threadedly connected to a lower plate nut (6).

6. The device for measuring underwater shafting force of a vertical structure pump according to claim 1, characterized in that: A plurality of through holes are provided on the circumference of the internal bracket (4), and the cavity is connected to the interior of the sensor bracket through the through holes.

7. The device for measuring underwater shafting force of a vertical structure pump according to claim 1, characterized in that: The side surface of the movable support (2) is connected to the inner side of the sensor bracket via a pin.

8. The method for installing a vertical structure pump underwater shaft force measurement device according to claim 1, characterized in that: The method comprises the following steps: S1: hoist the device shaft and fix it at the bottom; S2: Insert an O-ring into the end of the vertical pump and connect the fixed support (5) to the end of the vertical pump; S3: vertically hoisting the movable support member (2), connecting the side of the movable support member (2) and the fixed support member (5) by means of pins, and leveling; S4: insert the thrust bearing and position it through the first center hole of the movable support (2), and then screw a hexagonal nut into the upper end of the thrust bearing to fix it; S5: The internal bracket (4) and the force sensor are locked and fixed by means of the lower plate nut (6); then the internal bracket (4) is installed into the fixed support member (5) and fixed to the movable support member (2) so that the first center hole and the third center hole are aligned; S6: Install the external bracket (1) on the upper end of the fixed support member (5), and align the third center hole with the second center hole, and then install an O-ring on the external bracket (1) and the fixed support member (5); S7: Connect the force sensor to the upper end of the external bracket (1) and ensure that the axis is vertical, install an O-ring between the force sensor and the third center hole, and then tighten the upper plate nut (12) on the end of the force sensor extending out of the third center hole.

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