Axial force measuring device for horizontal double-suction pump with both ends supported

Abstract

The utility model relates to a horizontal two end support double suction pump axial force measuring device, including sensor limit cover, axial force transducer, outer gland, inner gland, bearing seat, deep groove ball bearing, lengthening shaft etc.

Description

Technical Field

[0001] This utility model relates to an axial force measuring device, specifically to a horizontal, double-suction pump axial force measuring device that is direct in force measurement, reliable in measurement results, requires minimal modification to the pump being measured, has low cost, is installed on the outside of the non-drive end of the pump, does not occupy the internal space of the pump, is easy to install and disassemble, and is easy to operate. Background Technology

[0002] During normal operation, a water pump generates axial force on its main shaft. While axial force is unavoidable during normal pump operation, and its magnitude and direction are usually consistent and borne by the pump's thrust bearing, the axial force on the rotor often becomes irregular and abnormal when the pump operates under unfavorable conditions or malfunctions. This can lead to friction and collision between the pump's moving and stationary parts, and even serious damage to the pump. Therefore, real-time measurement of the axial force in certain pumps can provide a basis for the rational selection of bearings, monitor the pump's operating status, and prevent malfunctions.

[0003] Currently, many pump manufacturers calculate the axial force of pumps using empirical formulas. However, the accuracy and applicability of axial force obtained by empirical and theoretical calculation methods are relatively poor. A small number of more important pumps are equipped with axial force measuring devices. These devices typically include: hydraulic force measuring mechanisms, indirect calculation using multi-point bonded strain gauges, and elastic force sensor elements installed on both sides of the thrust bearing. Each device has different principles, advantages, and disadvantages, and therefore is suitable for different scenarios.

[0004] Current similar technologies have the following shortcomings:

[0005] 1. Hydraulic force measuring mechanism

[0006] Its basic principle is that when the pump is running, the pump shaft achieves axial balance under the action of the axial force and the axial force in the opposite direction provided by the static hydraulic force measuring mechanism, and no axial displacement occurs. It has high accuracy and convenient and quick data reading, but the device is large in size, complex to assemble, and has a high cost.

[0007] 2. Multiple strain gauges are attached.

[0008] Directly attaching strain gauges to a compact pump presents challenges in determining axial force due to insufficient space for the measuring device caused by the mechanical seal occupying the axial space. This method involves selecting an appropriate cross-section for strain gauge attachment, reading the test values, and then calculating the bearing support's moment of inertia, the centroid of the metal cross-section, and other geometric properties. The axial force is then calculated using the axial force calculation formula. However, this method is highly dependent on the proper placement of the strain gauges, resulting in complex calculations and a slightly larger error.

[0009] 3. Install elastic force sensor elements on both sides of the thrust bearing.

[0010] When there is sufficient installation space within the rotor bearing cavity, it is possible to install sensor elastic elements on both sides of the bearing. These elastic elements are designed as annular rings, with geometric dimensions approximating the outer ring size of the rotor thrust bearing. The annular sensors are then installed on both ends of the bearing to directly sense the axial force on the outer ring. This method is simple in structure, small in size, and has good real-time performance. However, the measurement results are easily affected by environmental factors such as temperature changes, and replacement of the sensor requires complete disassembly of the bearing components. Utility Model Content

[0011] To address the aforementioned problems, the main objective of this utility model is to provide a horizontal, double-suction pump axial force measuring device that offers a direct force measurement method, reliable measurement results, minimal modification to the pump being measured, low cost, and is installed on the outside of the non-driving end of the pump, without occupying internal pump space. It is also easy to install, disassemble, and operate.

[0012] This utility model solves the above-mentioned technical problems through the following technical solution: a horizontal double-suction pump axial force measuring device with two-end support, the horizontal double-suction pump axial force measuring device includes: sensor limit cover fastening bolt, inner pressure cover anti-rotation bolt, sensor limit cover, axial force sensor, outer pressure cover, inner pressure cover, outer pressure cover fixing bolt, bearing lock nut, bearing seat, deep groove ball bearing, and extended shaft.

[0013] One end of the extended shaft is designed with an internal thread, which is installed in conjunction with the thread of the original pump shaft bearing lock nut. After the thread is tightened, the extended shaft is connected to the original pump shaft as one unit; the other end of the extended shaft is equipped with a deep groove ball bearing.

[0014] One end of the axial force sensor is connected to the inner pressure cover, and the other end is connected to the sensor limiting cover; the sensor limiting cover is fixed to the outer pressure cover, and the outer pressure cover is connected to the bearing component of the pump.

[0015] The outer ring of the deep groove ball bearing is installed in the inner hole of the bearing housing and is pressed by the inner pressure cover. The inner pressure cover is fixedly connected to the bearing housing (9). Finally, the original pump shaft transmits the axial force to the deep groove ball bearing through the extended shaft, and the deep groove ball bearing then transmits the axial force to the inner pressure cover.

[0016] In a specific embodiment of this utility model, the deep groove ball bearing is fixed to the extended shaft by a bearing locking nut.

[0017] In a specific embodiment of this utility model, the inner pressure cover is fixedly connected to the bearing seat by the inner pressure cover fixing bolt.

[0018] In a specific embodiment of this utility model, the outer ring of the deep groove ball bearing is installed in the inner hole of the bearing housing by interference fit.

[0019] In a specific embodiment of this utility model, the axial force sensor has mounting threads at both ends. One end is threaded to the inner pressure cover, and the other end is threaded to the sensor limiting cover.

[0020] In a specific embodiment of this utility model, the sensor limiting cover and the outer pressure cover are connected and fixed by the sensor limiting cover fastening bolts, and the outer pressure cover is connected to the pump bearing component by the outer pressure cover fixing bolts.

[0021] In a specific embodiment of this utility model, the inner pressure cover is provided with an anti-rotation pin hole, a sensor mounting threaded hole, and a fixing mounting hole. The inner pressure cover anti-rotation bolt passes through the sensor limit cover and the outer pressure cover and is positioned in the anti-rotation pin hole. The sensor mounting threaded hole is a hole for installing an axial force sensor. The inner pressure cover is installed on the bearing seat by passing a screw through the fixing mounting hole.

[0022] In a specific embodiment of this utility model, hand holes are provided on both sides of the outer pressure cover.

[0023] The positive and progressive effects of this utility model are as follows: The horizontal double-suction pump axial force measuring device provided by this utility model has the following advantages:

[0024] This invention requires no complex calculations, has a direct force measurement method, and provides reliable and highly accurate measurement results.

[0025] This invention utilizes the existing threaded connection with the shaft of the pump under test, requiring minimal modification to the pump and resulting in low cost.

[0026] This utility model is installed on the outside of the non-driving end of the pump, without occupying the internal space of the pump.

[0027] This utility model is easy to assemble and disassemble and is easy to operate.

[0028] This invention can precisely adjust the axial position of the pump rotor, facilitating the alignment of the pump flow channel. Attached Figure Description

[0029] Figure 1 A schematic diagram of the overall structure of this utility model.

[0030] Figure 2 This is a schematic diagram of the extended shaft in this utility model.

[0031] Figure 3 This is a schematic diagram of the inner pressure cover in this utility model.

[0032] Figure 4 This is a schematic diagram of the axial force sensor in this utility model.

[0033] The following are the names corresponding to the reference numerals in this utility model:

[0034] Figure 1-4In the middle: Sensor limit cover fastening bolt 1, inner pressure cover anti-rotation bolt 2, sensor limit cover 3, axial force sensor 4, outer pressure cover 5, inner pressure cover 6, outer pressure cover fixing bolt 7, bearing lock nut 8, bearing seat 9, inner pressure cover fixing bolt 10, deep groove ball bearing 11, extended shaft 12, mounting thread 401, anti-rotation pin hole 601, sensor mounting thread hole 602, fixing mounting hole 603, internal thread 1201. Detailed Implementation

[0035] The preferred embodiments of this utility model are given below with reference to the accompanying drawings to illustrate the technical solution of this utility model in detail.

[0036] Figure 1 A schematic diagram of the overall structure of this utility model is shown below. Figure 1 As shown: The horizontal double-suction pump axial force measuring device with two-end support proposed in this utility model includes: sensor limit cover fastening bolt 1, inner pressure cover anti-rotation bolt 2, sensor limit cover 3, axial force sensor 4, outer pressure cover 5, inner pressure cover 6, outer pressure cover fixing bolt 7, bearing locking nut 8, bearing seat 9, inner pressure cover fixing bolt 10, deep groove ball bearing 11, and extended shaft 12.

[0037] The assembly relationship of the device is as follows: Extended shaft 12 (e.g.) Figure 2 One end of the extended shaft 12 is designed with an internal thread 1201, which mates with the threaded locking nut of the original pump shaft. After tightening the thread, the extended shaft 12 is integrated with the original pump shaft. The other end of the extended shaft 12 is fitted with a deep groove ball bearing 11, which is fixed to the extended shaft 12 by a bearing locking nut 8. The outer ring of the deep groove ball bearing 11 is installed in the inner hole of the bearing housing 9 with an interference fit, and is secured by an inner pressure cap 6 (participating in...). Figure 3 The inner pressure cover 6 is tightened and fixedly connected to the bearing housing 9 by the inner pressure cover fixing bolts 10. Finally, the original pump shaft transmits axial force to the deep groove ball bearing 11 via the extended shaft 12, and the deep groove ball bearing 11 then transmits the axial force to the inner pressure cover 6 (e.g., ...). Figure 3 Due to the action of the deep groove ball bearing 11, the rotational force of the original pump shaft will not be transmitted to the inner pressure cover 6, and the inner pressure cover 6 will not rotate under the restriction of the inner pressure cover anti-rotation bolt 2. The axial force sensor 4 has mounting threads 401 at both ends (e.g., ...). Figure 4 One end of the sensor 4 is threaded to the inner pressure cover 6, and the other end is threaded to the sensor limiting cover 3. The sensor limiting cover 3 and the outer pressure cover 5 are connected and fixed by the sensor limiting cover fastening bolt 1. The outer pressure cover 5 is connected to the pump bearing component by the outer pressure cover fixing bolt 7. In this way, the axial displacement of the axial force sensor 4 is completely restricted.

[0038] The inner pressure cover 6 is provided with an anti-rotation pin hole 601, a sensor mounting threaded hole 602, and a fixing mounting hole 603. The inner pressure cover anti-rotation bolt 2 passes through the sensor limit cover 3 and the outer pressure cover 5 and is positioned in the anti-rotation pin hole 601. The sensor mounting threaded hole 602 is a hole for installing the axial force sensor 4. The inner pressure cover 6 is installed on the bearing seat 9 by passing a screw through the fixing mounting hole 603.

[0039] The axial force transmission principle of this device is as follows: the original pump shaft transmits the axial force to the extended shaft 1 via a threaded connection. The extended shaft then transmits the axial force to the deep groove ball bearing 11. The deep groove ball bearing 11 transmits the axial force to the inner pressure cover 6. The inner pressure cover 6 then transmits the axial force to the axial force sensor 4 via a threaded connection. Finally, the sensor transmits the force measurement electrical signal through the wire 13 (participating in...). Figure 4 )transmission.

[0040] The principle of this device for adjusting the axial position of the pump rotor is as follows: There are hand holes on both sides of the outer pressure cover 5. When the anti-rotation bolt 2 of the inner pressure cover is not installed, the operator can rotate the bearing seat 9 through the hand holes. Since the bearing seat 9 and the inner pressure cover 6 are fixed as one piece, the inner pressure cover 6 and the axial force sensor 4 are connected to rotate relative to each other. Since the axial force sensor 4 is fixed in position, this relative rotation can drive the axial displacement of the entire pump rotor, thereby accurately adjusting the axial position of the pump rotor.

[0041] This invention uses an elastic stress sensor to directly measure axial force, resulting in accurate measurements.

[0042] This invention utilizes the threaded shaft end of the original pump shaft used for locking the bearing to install a force measuring device, requiring minimal modification to the original pump structure.

[0043] This invention is installed on the outer side of the non-driving side of the pump shaft, without occupying the internal space of the pump.

[0044] This invention allows for precise adjustment of the axial position of the pump rotor.

[0045] This utility model provides an axial force measuring device that can be installed on a pump with supports at both ends, can directly measure axial force with high accuracy, requires minimal modification to the original pump structure, is not affected by the internal space of the original pump, and can accurately adjust the axial alignment position of the rotor.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A horizontal, double-suction pump axial force measuring device with two-end support, characterized in that: The horizontal double-suction pump axial force measuring device with two-end support includes: sensor limit cover fastening bolt, inner pressure cover anti-rotation bolt, sensor limit cover, axial force sensor, outer pressure cover, inner pressure cover, outer pressure cover fixing bolt, bearing lock nut, bearing seat, deep groove ball bearing, and extended shaft. One end of the extended shaft is designed with an internal thread, which mates with the threaded locking nut of the original pump shaft's bearing. After tightening the thread, the extended shaft and the original pump shaft become one unit. The other end of the extended shaft is fitted with a deep groove ball bearing. One end of the axial force sensor is connected to the inner pressure cover, and the other end is connected to the sensor limiting cover; the sensor limiting cover is fixed to the outer pressure cover, and the outer pressure cover is connected to the bearing component of the pump. The outer ring of the deep groove ball bearing is installed in the inner hole of the bearing housing and is pressed by the inner pressure cover. The inner pressure cover is fixedly connected to the bearing housing (9). Finally, the original pump shaft transmits the axial force to the deep groove ball bearing through the extended shaft, and the deep groove ball bearing then transmits the axial force to the inner pressure cover.

2. The horizontal double-suction pump axial force measuring device with two-end support according to claim 1, characterized in that: The deep groove ball bearing is fixed to the extended shaft by a bearing lock nut.

3. The horizontal double-suction pump axial force measuring device with two-end support according to claim 1, characterized in that: The inner pressure cover is fixedly connected to the bearing housing by the inner pressure cover fixing bolts.

4. The horizontal double-suction pump axial force measuring device with two-end support according to claim 1, characterized in that: The outer ring of a deep groove ball bearing is installed in the inner bore of the bearing housing via an interference fit.

5. The horizontal double-suction pump axial force measuring device with two-end support according to claim 1, characterized in that: The axial force sensor has mounting threads at both ends. One end is threaded to the inner pressure cover, and the other end is threaded to the sensor limit cover.

6. The horizontal double-suction pump axial force measuring device with two-end support according to claim 1, characterized in that: The sensor limit cover and the outer pressure cover are connected and fixed by the sensor limit cover fastening bolts, and the outer pressure cover is connected to the pump bearing components by the outer pressure cover fixing bolts.

7. The horizontal double-suction pump axial force measuring device with two-end support according to claim 1, characterized in that: The inner pressure cover is provided with an anti-rotation pin hole, a sensor mounting threaded hole, and a fixing mounting hole. The anti-rotation bolt of the inner pressure cover is used to pass through the sensor limit cover and the outer pressure cover and is positioned in the anti-rotation pin hole. The sensor mounting threaded hole is the hole for installing the axial force sensor. The inner pressure cover is installed on the bearing seat by passing a screw through the fixing mounting hole.

8. The horizontal double-suction pump axial force measuring device with two-end support according to claim 1, characterized in that: Hand holes are provided on both sides of the outer pressure cap.

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