Axial force measuring assembly for vertical water pump

Abstract

The utility model discloses an axial force measuring assembly for a vertical water pump. The axial force measuring assembly is characterized in that the measuring assembly is arranged between an output shaft of a motor and a pump shaft; the measuring assembly comprises a bridging shaft, an angular contact ball bearing, a mounting seat and a force measuring sensing piece; the bridging shaft is coaxially connected with the output shaft and the pump shaft through couplings; the periphery of the bridging shaft is tightly matched with the inner ring of the angular contact ball bearing; the mounting seat is suitable for fixing an outer ring of the angular contact ball bearing and moves along the axial direction of the bridging shaft along with the angular contact ball bearing; the force measurement sensing piece is arranged between the mounting seat and a rack on which the pump shaft is mounted, and is used for detecting forward pressure or reverse tension applied to an output shaft of the motor by the pump shaft in the axial direction; the axial force measuring assembly for the vertical water pump is simple in structure, easy and convenient to manufacture, easy to implement and low in cost, and solves the problem that an existing axial force measuring device can measure only by modifying the internal structure of a motor and is poor in universality.

Description

Technical Field

[0001] The utility model relates to the field of pump shaft axial force measurement, in particular to an axial force measurement component for a vertical water pump. Background Art

[0002] During operation, the existing vertical water pump will generate axial force on the pump shaft, and directly act on the drive motor shaft through a rigid coupling. If the axial force on the drive motor shaft is too large, it will easily have an adverse effect on the service life of the motor shaft and the mechanical efficiency of the motor, and generate a lot of noise. Therefore, if the size and direction of the axial force on the water pump drive motor shaft can be accurately measured, it will be of great help to the research and development and design of the water pump motor (i.e., to solve the problem of excessive axial force mentioned above in a targeted manner).

[0003] At present, a small number of R&D personnel have begun to perform assembly measurements during the R&D stage; force sensors are arranged on motor parts or inside the motor; however, this method requires the structure of the motor to be modified, which greatly increases the production cost and R&D difficulty. More importantly, its versatility is reduced and it cannot be applied to the measurement of conventional motors, and its practicality is poor; in addition, the existing axial force measurement device can only measure the axial force of the motor, and cannot restore (measure) the axial force change when the motor drags the pump body or the pump body drags the motor. The measured data is insufficient and the actual situation cannot be truly restored; it cannot be used for the measurement between the motor and the pump body that has been applied, and the scope of application is small;

[0004] In summary, the existing axial force measurement devices or components need to be further improved to meet the needs of practical applications. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned defects or problems existing in the background technology, and to provide an axial force measuring component for a vertical water pump, which has a simple structure, is easy to manufacture, easy to implement and has low cost, and solves the problem that the existing axial force measuring device needs to modify the internal structure of the motor for measurement and has poor versatility.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An axial force measuring assembly for a vertical water pump, characterized in that: the measuring assembly is installed between the output shaft of the motor and the pump shaft; the measuring assembly comprises a bridge shaft, an angular contact ball bearing, a mounting seat and a force sensing component;

[0008] A bridge shaft, which is coaxially connected to the output shaft and the pump shaft through a coupling; and the outer periphery of the bridge shaft is tightly matched with the inner ring of the angular contact ball bearing;

[0009] A mounting seat, which is suitable for fixing the outer ring of the angular contact ball bearing and moves axially along the bridge shaft with the angular contact ball bearing;

[0010] The force sensing component is arranged between the mounting seat and the frame on which the pump shaft is mounted, so as to detect the positive pressure or reverse pulling force applied by the pump shaft to the output shaft of the motor in the axial direction.

[0011] Further, the angular contact ball bearing is configured as a single-row angular contact ball bearing or a double-row angular contact ball bearing.

[0012] Furthermore, the coupling connecting the output shaft of the motor and the bridge shaft is configured as a flexible coupling; and the coupling connecting the pump shaft and the bridge shaft is a rigid coupling.

[0013] Furthermore, it also includes a flange, which is coaxially limitedly mounted on the side of the frame facing the motor relative to the bridging shaft; the two axial surfaces of the force sensing component are respectively fixed to the opposite surfaces between the mounting seat and the flange.

[0014] Furthermore, it also includes a circumferential limiting structure, which is used to limit the circumferential movement of the mounting seat relative to the flange; the circumferential limiting structure includes a plurality of limiting screws and docking parts that cooperate with each other, and the docking parts are coaxially arranged on the flange with the bridging shaft; one end of the limiting screw passes through the mounting seat and is fixed to the docking part, so that the mounting seat can move relative to the flange along the axis of the limiting screw and limit the circumferential rotation of the two.

[0015] Furthermore, two groups of force-measuring sensing components are installed between the mounting seat and the flange, and the two groups of force-measuring sensing components are arranged opposite to each other.

[0016] Furthermore, it also includes a bearing fixing structure, which is used for axial limitation of the angular contact ball bearing; the bearing fixing structure includes a stop washer and a locking piece; the stop washer is axially pressed against the inner ring end face of the angular contact ball bearing and is fixed by the locking piece.

[0017] Furthermore, the bearing fixing structure also includes a bearing pressure ring, which acts on the outer ring end face of the angular contact ball bearing in the axial direction and is fixed to the mounting seat.

[0018] Furthermore, it also includes a protective dust cover, which is sleeved between the base on which the motor is installed and the frame to protect the bridging shaft, the mounting seat and the force sensing component.

[0019] Furthermore, the protective dust cover includes a cover body and a movable door, the cover body is sleeved between the base and the frame to form an opening; the movable door is detachably mounted on the opening.

[0020] From the above description of the utility model, it can be seen that compared with the prior art, the utility model has the following beneficial effects:

[0021] (1) The utility model provides an axial force measuring assembly for a vertical water pump, which has a simple structure, is easy to manufacture, easy to implement and has low cost. The measuring function can be realized by simply separating the motor and the water pump and connecting the measuring assembly of the utility model to the output shaft and the pump shaft of the motor, that is, connecting the output shaft and the pump shaft to the bridge shaft through a coupling respectively. The utility model can be used for both equipment that has been put into production and newly assembled equipment, and has strong versatility. There is no need to modify the internal structure of the motor or the water pump, and has the advantages of simple and compact structure and easy assembly. In addition, the measuring assembly of the utility model only needs to install a set of force measuring sensors on the bridge shaft to measure the axial force generated during the operation of the water pump and its changes in real time. The actual size and change law of the axial force generated during the operation of the water pump (such as the Ft curve) can be used as the load parameter data of the motor in the future to restore the actual working condition of the motor driving the vertical water pump, so as to better improve and optimize the motor structure and parameters.

[0022] (2) The angular contact ball bearing described in the present invention is configured as a single-row angular contact ball bearing or a double-row angular contact ball bearing, and can monitor unidirectional axial force or bidirectional axial force according to actual needs; under normal circumstances, the axial force generated by the water pump shaft is usually in the downward direction, so a single-row angular contact ball bearing is used to measure only the vertically downward axial force of the water pump, which can further reduce the axial size of the tooling and save tooling costs; a double-row angular contact ball bearing can also be used to achieve the pulling force on the output shaft of the motor when the axial force of the water pump shaft is downward, and can also monitor the axial force of the motor output shaft on the water pump shaft, which is more practical.

[0023] (3) In the present invention, the coupling connecting the output shaft of the motor and the bridge shaft is configured as a flexible coupling; the coupling connecting the pump shaft and the bridge shaft is a rigid coupling; the flexible coupling (bellows coupling) has the characteristics of small axial stiffness and allows large axial movement, and the axial force generated by the water pump shaft is basically offset in the measuring component and measured by the force sensing component, thereby ensuring the measurement accuracy.

[0024] (4) The novel measuring assembly also includes a flange, which ensures that the force sensing component can be easily assembled through the flange structure. There is no need to process the frame on which the water pump is installed, and only coaxial positioning is required. The mounting seat and the flange are centered, so that the entire assembly does not need to spend more time to adjust the axial deviation, angle deviation, etc. of the bridge shaft, output shaft, etc., and the assembly is simpler.

[0025] (5) The present invention is also provided with a circumferential limiting structure, so that the mounting seat can move relative to the flange along the axis of the limiting screw, but limits the circumferential rotation of the mounting seat and the flange. This arrangement constrains the other degrees of freedom of the mounting seat relative to the flange, and only retains relative axial movement. In this way, the accuracy of the force sensing component during measurement is maintained and will not be affected by other friction forces or restraining forces, thereby more accurately restoring the actual situation.

[0026] (6) The novel method also limits the axial movement of the angular contact ball bearing through a bearing fixing structure, ensuring that it is not easy to loosen or deviate during the process, thereby improving measurement accuracy. At the same time, force transmission is more direct, ensuring the accuracy of subsequent measurements.

[0027] (7) The new model is also provided with a protective dust cover, which is mounted between the base on which the motor is mounted and the frame to protect the bridge shaft, the mounting seat and the force sensing component; it ensures that the above components are not easily affected by the external environment, plays a sealing and protective role, and also prevents the operator from accidentally touching the rotating parts during the test and getting injured, and also reduces the noise during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a schematic diagram of the three-dimensional exploded structure of the measuring component of the utility model;

[0030] Figure 2 It is a three-dimensional structural schematic diagram of the measuring assembly of the utility model;

[0031] Figure 3 is a cross-sectional view of the measuring assembly of the utility model;

[0032] Figure 4 It is a three-dimensional structural schematic diagram of a vertical water pump equipped with a measuring component according to the utility model;

[0033] Figure 5 It is a cross-sectional view of a vertical water pump equipped with a measuring assembly according to the utility model. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are preferred embodiments of the utility model and should not be regarded as excluding other embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0035] In the claims, specification and the above drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0036] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the use of terms such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the referred device or element must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the utility model.

[0037] In the claims, specification and the above drawings of the utility model, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two parties, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0038] In the claims, specification and drawings of the present utility model, if the terms "including", "having" and their variations are used, they are intended to mean "including but not limited to".

[0039] See also Figure 1-3 As shown, Figure 1 and Figure 2 They are respectively a three-dimensional exploded view and a three-dimensional view of the measuring assembly, which are mainly used to show the various components of the measuring assembly of the present invention and the state after assembly; Figure 3 The cross-sectional view of the measuring assembly is used to show the assembly status and connection relationship between the components;

[0040] The present embodiment describes an axial force measuring assembly for a vertical water pump, the measuring assembly being installed between the output shaft 11 of the motor 1 and the pump shaft 21; the measuring assembly mainly comprises the following components: a bridge shaft 3, an angular contact ball bearing 4, a mounting seat 5, a force sensing member H, a flange 7, a flexible coupling 81, a limit screw 9, a docking member 10, a stop washer A, a locking member B, a bearing pressure ring C, a protective dust cover 6, a cover body 61 and a movable door 62;

[0041] In this embodiment, a stepped bridge shaft 3 is taken as an example. The inner ring 41 of the angular contact ball bearing 4 is mounted and tightly fitted on the outer periphery of the bridge shaft 3 and rests on the stepped portion 31. Thus, one end face of the inner ring 41 of the angular contact ball bearing 4 is blocked by the stepped portion 31 in the axial direction and cannot move downward in the axial direction, while the outer ring 42 of the angular contact ball bearing 4 is axially limited by the mounting seat 5; the other end face of the angular contact ball bearing 4 is limited by the bearing fixing structure (i.e., both the inner ring 41 and the outer ring 42 are limited respectively), thereby limiting the axial movement of the angular contact ball bearing 4 on the bridge shaft 3;

[0042] In this embodiment, the limiting of the other end face of the angular contact ball bearing 4 includes the limiting of the inner ring 41 and the limiting of the outer ring 42; wherein the limiting of the inner ring 41 is achieved by the stop washer A in cooperation with the locking piece B, that is, the stop washer A is limitedly sleeved on the bridge shaft 3 and placed on the other end face of the angular contact ball bearing 4, and then is tightly fitted or screwed by the locking piece B to limit the axial displacement of the inner ring 41; as for the outer ring 42, it is fixed by the bearing pressure ring C, which presses against the outer ring 42 position of the angular contact ball bearing 4, and is tightly fitted on the bridge shaft 3 and installed on the mounting seat 5, so that the entire angular contact ball bearing 4 is axially fixed on the bridge shaft 3;

[0043] It should be noted here that, in this embodiment, before the bearing pressure ring C is installed, the entire assembly consisting of the bridge shaft 3, the angular contact ball bearing 4, the retaining washer A and the locking piece B is first placed on the mounting seat 5 and then fixed into one with the bearing pressure ring C.

[0044] The angular contact ball bearing 4 in this embodiment can adopt a single-row angular contact ball bearing 4 or a double-row angular contact ball bearing 4, and it can be selected according to the needs of the actual application scenario. Since the axial force generated by the rotating shaft of the water pump 2 when the vertical water pump is working is usually in the downward direction, a single-row angular contact ball bearing 4 can be used to measure only the vertically downward force of the water pump 2 shaft 21, thereby further reducing the axial size of the tooling and saving the tooling cost. This embodiment takes the double-row angular contact ball bearing 4 as an example, which can realize the measurement of axial forces in two directions.

[0045] The mounting seat 5 is suitable for fixing the outer ring 42 of the angular contact ball bearing 4, and moves axially along the bridge shaft 3 with the angular contact ball bearing 4; a space E is formed between the mounting seat 5 and the frame on which the pump shaft 21 is installed, and the space E is used to install the force sensing component H, and the upper and lower end surfaces of the force sensing component H are respectively fixed to the lower surface of the mounting seat 5 and the upper surface of the frame 20; in this embodiment, in order to be suitable for equipment that has been put into production, improve measurement accuracy and reduce assembly difficulty, a flange 7 is fixed on the upper surface of the frame 20, and subsequent assembly only needs to center and fix the flange 7 and the frame 20, and there is no need to process the frame 20, so subsequent assembly is simpler;

[0046] During assembly, the flange 7 is coaxially limitedly mounted relative to the bridge shaft 3 on the side of the frame 20 facing the motor 1. This assembly uses the original centering hole of the frame 20 for centering cooperation, so that there is no need to adjust or reduce the axis deviation and angle deviation after assembly; then the two axial surfaces (i.e., the upper and lower end surfaces) of the two sets of force sensing components H are respectively fixed to the opposite surfaces between the mounting seat 5 and the flange 7;

[0047] Then, the mounting seat 5 and the flange 7 are connected through a circumferential limiting structure; the circumferential limiting structure in this embodiment is used to limit the circumferential movement of the mounting seat 5 relative to the flange 7; the docking pieces 10 of the circumferential limiting structure are evenly spaced along the circumference of the flange 7 and are coaxially arranged with the bridging shaft 3; similarly, a through hole at the same position as the docking piece 10 is opened on the mounting seat 5, and then one end of the limiting screw 9 passes through the mounting seat 5 and is fixed to the docking piece 10, so that the mounting seat 5 moves relative to the flange 7 along the axis of the limiting screw 9 and limits the circumferential rotation of the two; the above settings are all coaxially arranged with the axis of the bridging shaft 3 as the reference to achieve precise centering;

[0048] The force sensing component H is arranged between the mounting seat 5 and the frame 20 on which the pump shaft 21 is mounted, so as to detect the positive pressure or reverse tension applied by the pump shaft 21 to the output shaft 11 of the motor in the axial direction. It should be noted that, in this embodiment, a resistance strain gauge force sensor is used as an example of the force sensing component H, but it is not limited to this force sensing component H, and any force sensing component H that can monitor the change of axial force is acceptable.

[0049] As shown in Figures 4 and 5, the two couplings are fixedly mounted on the two ends of the bridge shaft 3, wherein the coupling connecting the output shaft 11 of the motor 1 with the bridge shaft 3 is configured as a flexible coupling 81, a bellows coupling is used as an example in this embodiment; and the coupling connecting the pump shaft 21 with the bridge shaft 3 is a rigid coupling 82; utilizing the characteristics of the bellows coupling with small axial stiffness and allowing large axial movement, the axial force generated by the rotating shaft of the water pump 2 is basically offset in the tooling area and measured by the force sensor, thereby ensuring the measurement accuracy.

[0050] The flange 7 is assembled with the frame 20 in a centering manner, and the other opening of the rigid coupling 82 is coaxially fixed to the pump shaft 21; then the protective dust cover 6 is put on, and the motor 1 part is installed accordingly (that is, the output shaft 11 of the motor 1 is coaxially installed with the flexible coupling 81 (bellows coupling)); it should be noted here that the protective dust cover 6 is sleeved between the base on which the motor 1 is installed and the frame 20, so as to protect the bridging shaft 3, the mounting seat 5 and the force sensing part H; during actual assembly, the protective dust cover 6 is composed of a cover body 61 and a movable door 62, that is, the cover body 61 is sleeved between the base and the frame 20 and forms an opening, and the movable door 62 is detachably mounted on the opening by screws, and the opening is convenient for subsequent maintenance, data reading, etc., to avoid injuries caused by operators accidentally touching rotating parts during the test, reduce the noise level during the test, and play a dust-proof role.

[0051] The axial force measuring component of the present embodiment does not require modification of the motor 1 or the water pump 2. It only requires the existing motor 1 and the water pump 2 to be disassembled and separated, and the measurement can be performed after the measuring component of the present embodiment is added in between. The assembly is also easy to implement, and the entire structure is simple and compact, and there is no need to spend time adjusting the axial deviation and angular deviation between the bridge shaft 3 and the output shaft 11 of the motor 1, and between the bridge shaft 3 and the pump shaft 21 of the water pump 2.

[0052] During actual measurement:

[0053] (1) When the motor 1 drives the vertical water pump 2 to work, the axial force generated by the water pump 2 is applied by the rotating shaft of the water pump 2 to the bridge shaft 3 connected to it through the rigid coupling 82. If the axial force of the water pump 2 is directed downward, the axial force is transmitted to the mounting seat 5 through the double-row angular contact ball bearing 4 (it should be noted here that since the force sensing component H is fixedly connected to the mounting seat 5 and the flange 7, when subjected to the downward axial force, the mounting seat 5 has a downward movement tendency or moves downward, thereby pressing the force sensing component H downward, and the force sensing component H is subjected to downward pressure at this time); and the flange 7 is installed on the frame 20, and is provided to the force sensing component H as a part of the frame 20 to balance the reaction force of the axial force; and the force sensing component H is a resistance strain gauge force sensor. The downward axial force and the reaction force cause the central screw H1 of the force sensor to be compressed and axially deformed. The axial deformation causes the change of the resistance of its internal circuit and outputs a signal. After software processing, the specific value of the axial force is obtained;

[0054] The measuring assembly of this embodiment ensures that all axial forces of the rotating shaft 21 of the water pump 2 exerted on the bridge shaft 3 can be transmitted to the force sensing member H in the end without being affected by other friction forces or restraining forces, thereby ensuring the measurement accuracy;

[0055] The transmission path of the downward axial force of the pump 2 shaft on the entire measuring assembly is as follows:

[0056] Axial force of the rotating shaft of water pump 2 → rigid coupling 82 → bridge shaft 3 → inner ring 41 of double-row angular contact ball bearing → rolling ball 43 of double-row angular contact ball bearing → outer ring 42 of double-row angular contact ball bearing → mounting seat 5 → force sensing element H (pressure measurement).

[0057] If the axial force of the water pump 2 is in the upward direction, similarly, the axial force is also transmitted to the mounting seat 5 through the double-row angular contact ball bearing 4, and the axial force is transmitted to the force sensing part H through the mounting seat 5 (it should be noted here that since the force sensing part H is fixedly connected to the mounting seat 5 and the flange 7, when subjected to the upward axial force, the mounting seat 5 has an upward movement tendency or upward movement, and then pulls the force sensing part H upward, and the force sensing part H is subjected to an upward pulling force at this time), and the flange 7 provides the force sensor with a reaction force for balancing. The upward axial force and the reaction force (downward reverse force) cause the center screw H1 of the force sensor to be subjected to the tensile force and axial deformation, and the axial deformation causes the change of its internal circuit resistance and output signal, and the specific value of the axial force is obtained after software processing.

[0058] The transmission path of the downward axial force of the pump 2 shaft on the entire measuring assembly is as follows:

[0059] Water pump 2 shaft 21 axial force → rigid coupling 82 → bridge shaft 3 → inner ring 41 of double row angular contact ball bearing → rolling ball 43 of double row angular contact ball bearing → outer ring 42 of double row angular contact ball bearing → mounting seat 5 → force sensing part H (measure tensile force).

[0060] Through the above method, the upward or downward axial force of the motor 1 when driving the water pump 2 can be accurately measured, and the change of the axial force can be monitored according to needs. The measurement results are instructive and can be used as the actual load parameter data of the motor 1. Through this data, the structure and parameters of the motor 1 can be improved and optimized in a more targeted manner.

[0061] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An axial force measurement assembly for a vertical water pump, characterized in that: The measuring assembly is installed between the output shaft of the motor and the pump shaft; The measuring assembly comprises a bridge shaft, an angular contact ball bearing, a mounting seat and a force sensing component; A bridge shaft, which is coaxially connected to the output shaft and the pump shaft through a coupling; and the outer periphery of the bridge shaft is tightly matched with the inner ring of the angular contact ball bearing; A mounting seat, which is suitable for fixing the outer ring of the angular contact ball bearing and moves axially along the bridge shaft with the angular contact ball bearing; The force sensing component is arranged between the mounting seat and the frame on which the pump shaft is mounted, so as to detect the positive pressure or reverse pulling force applied by the pump shaft to the output shaft of the motor in the axial direction.

2. An axial force measuring assembly for a vertical water pump according to claim 1, characterized in that: The angular contact ball bearing is configured as a single-row angular contact ball bearing or a double-row angular contact ball bearing.

3. An axial force measuring assembly for a vertical water pump according to claim 2, characterized in that: The coupling connecting the output shaft of the motor and the bridge shaft is configured as a flexible coupling; the coupling connecting the pump shaft and the bridge shaft is a rigid coupling.

4. An axial force measuring assembly for a vertical water pump as claimed in claim 3, characterized in that: It also includes a flange, which is coaxially limitedly mounted on the side of the frame facing the motor relative to the bridging shaft; the two axial surfaces of the force sensing component are respectively fixed to the opposite surfaces between the mounting seat and the flange.

5. An axial force measuring assembly for a vertical water pump as claimed in claim 4, characterized in that: It also includes a circumferential limiting structure, which is used to limit the circumferential movement of the mounting seat relative to the flange; the circumferential limiting structure includes a plurality of limiting screws and docking parts that cooperate with each other, and the docking parts are coaxially arranged on the flange with the bridging shaft; one end of the limiting screw passes through the mounting seat and is fixed to the docking part, so that the mounting seat can move relative to the flange along the axis of the limiting screw and limit the circumferential rotation of the two.

6. An axial force measuring assembly for a vertical water pump according to claim 4, characterized in that: Two groups of force sensing components are arranged between the mounting seat and the flange, and the two groups of force sensing components are arranged opposite to each other.

7. An axial force measuring assembly for a vertical water pump according to claim 1, characterized in that: It also includes a bearing fixing structure, which is used for axial limitation of the angular contact ball bearing; the bearing fixing structure includes a stop washer and a locking piece; the stop washer is pressed axially against the inner ring end face of the angular contact ball bearing and is fixed by the locking piece.

8. An axial force measuring assembly for a vertical water pump according to claim 7, characterized in that: The bearing fixing structure also includes a bearing pressure ring, which acts on the outer ring end surface of the angular contact ball bearing in the axial direction and is fixed to the mounting seat.

9. An axial force measuring assembly for a vertical water pump according to claim 1, characterized in that: It also includes a protective dust cover, which is sleeved between the base on which the motor is installed and the frame to protect the bridge shaft, the mounting seat and the force sensing component.

10. An axial force measuring assembly for a vertical water pump according to claim 9, characterized in that: The protective dust cover comprises a cover body and a movable door. The cover body is sleeved between the base and the frame to form an opening. The movable door is detachably mounted on the opening.

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