Hydroelectric generating set spring bundle structure thrust pad stress monitoring device and method

Abstract

The invention discloses a hydroelectric generating set spring bundle structure thrust pad stress monitoring device and method, and relates to the technical field of hydro-generators. The hydroelectric generating set spring bundle structure thrust pad stress monitoring device comprises a foundation ring, and the top of the foundation ring is sequentially provided with a spring bundle assembly, a supporting pad and a thrust pad from bottom to top; the spring bundle assembly comprises a circle of spring bundle baffle fixed to the top of the foundation ring and a plurality of spring bundles arranged in the spring bundle baffle and tightly attached to the spring bundle baffle, and the two ends of each spring bundle abut against the foundation ring and the supporting tile respectively. A plurality of monitoring areas are arranged in the spring bundle baffle, and one spring bundle in each monitoring area is an integrated sensor spring. According to the application, the plurality of monitoring areas are arranged for performing multi-point monitoring on the stress condition of the thrust pad, the overall stress distribution condition of the thrust pad can be calculated according to the position of each monitoring area and the stress condition of the spring bundle in the monitoring area, and the stress monitoring of the thrust pad is effectively realized.

Description

Technical Field

[0001] The present application relates to the technical field of hydro-turbine generators, and in particular to a device and method for monitoring the force of a thrust bearing of a spring bundle structure of a hydro-turbine generator set. Background Art

[0002] In large hydropower units, thrust bearings are key supporting components. Their main function is to bear the mass and axial water thrust of all rotating parts of the turbine generator and transfer the load to the foundation through the lower bracket. The operating status of the thrust bearings directly affects the safe and reliable operation of the turbine generator, so it is of great significance to monitor their operating status.

[0003] At present, there are two main types of thrust bearing support structures in large hydropower units: support bolts and spring bundles. The force monitoring technology of the support bolt type thrust bearing is simple and has been maturely applied. For the thrust bearing of the spring bundle structure, since there are more springs under each thrust bearing, the springs are subjected to greater force, resulting in a compact space under the thrust bearing, and traditional monitoring technology is difficult to achieve effective force monitoring. Summary of the invention

[0004] The purpose of the present application is to provide a device and method for monitoring the force of a thrust washer of a spring bundle structure of a hydropower unit, so as to solve the problem that it is difficult for traditional monitoring technology to effectively monitor the force of the thrust washer of the spring bundle structure.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] In a first aspect, a thrust washer force monitoring device for a spring bundle structure of a hydropower unit is provided, comprising a base ring, wherein a spring bundle assembly, a support washer and a thrust washer are sequentially arranged on the top of the base ring from bottom to top;

[0007] The spring bundle assembly includes a circle of spring bundle baffles fixed on the top of the base ring and a plurality of spring bundles arranged in the spring bundle baffles and tightly attached, and the two ends of the spring bundles are respectively in contact with the base ring and the support shoe;

[0008] A plurality of monitoring areas are arranged in the spring bundle baffle, and one of the spring bundles in the monitoring area is an integrated sensor spring.

[0009] Furthermore, the integrated sensor spring is in close contact with the spring bundle surrounding it.

[0010] Furthermore, the integrated sensor spring includes a vertically arranged support spring, a spring lower plate connected to the lower end of the support spring, a spring upper plate connected to the upper end of the support spring, and a displacement sensor vertically arranged in the support spring; the lower end of the displacement sensor is connected to the spring lower plate, and the upper end of the displacement sensor passes through the spring upper plate and abuts against the support valve.

[0011] Furthermore, the displacement sensor includes an LVDT sensor.

[0012] Furthermore, the protection grade requirement of the displacement sensor is IP68.

[0013] Furthermore, the spring lower plate and the spring upper plate each include a plurality of overlapping washers.

[0014] Furthermore, the gasket is a 40Cr gasket.

[0015] Furthermore, eight monitoring areas are arranged in the spring bundle baffle.

[0016] Furthermore, the spring bundle baffle is connected to the base ring through bolts.

[0017] In the second aspect, a method for monitoring the force of a thrust washer in a spring bundle structure of a hydropower unit is provided, using the device for monitoring the force of a thrust washer in a spring bundle structure of a hydropower unit provided in the first aspect; the method comprises: obtaining the position and deformation of the integrated sensor spring; and calculating the force distribution of the thrust washer according to the position and deformation of the integrated sensor spring.

[0018] Beneficial effects of this application:

[0019] 1. The thrust washer force monitoring device and method for the spring bundle structure of a hydropower unit provided in the embodiment of the present application, by setting up multiple monitoring areas, is used to perform multi-point monitoring of the force condition of the thrust washer. By setting a spring bundle in each monitoring area as an integrated sensor spring, the integrated sensor spring can be used to measure the change in displacement between the thrust washer and the base ring, and then the force condition of the spring bundle in each monitoring area is obtained. According to the position of each monitoring area and the force condition of the spring bundle therein, the overall force distribution of the thrust washer can be calculated, thereby effectively realizing the force monitoring of the thrust washer.

[0020] 2. The device and method for monitoring the force of the thrust bearing of the spring bundle structure of the hydropower unit provided in the embodiment of the present application do not change the overall force structure of the thrust bearing, nor change the oil film state between the thrust bearing and the mirror plate. Without affecting the stable operation of the thrust bearing, accurate monitoring of the force of the thrust bearing is achieved, thereby solving the problem that the thrust bearing of the spring bundle structure cannot be effectively monitored. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a thrust bearing force monitoring device for a spring bundle structure of a hydropower unit provided in an embodiment of the present application;

[0023] Figure 2 is a plan view of the spring bundle assembly;

[0024] Figure 3 It is a schematic diagram of the structure of the integrated sensor spring.

[0025] Reference numerals:

[0026] 1-Thrust head;

[0027] 2- mirror plate;

[0028] 3-Thrust bearing;

[0029] 4-Towa;

[0030] 5- Spring bundle assembly;

[0031] 51-spring beam baffle;

[0032] 52-spring bundle;

[0033] 53-Integrated sensor spring;

[0034] 531-support spring;

[0035] 532-spring lower plate;

[0036] 533-Spring upper plate;

[0037] 534-displacement sensor;

[0038] 535-sensor lead wire;

[0039] 6-base ring;

[0040] 7- Lower the rack. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0042] In the description of this application, the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. Unless otherwise specified, the above-mentioned directional descriptions can be flexibly set in the process of actual application under the condition that the relative positional relationship shown in the accompanying drawings is satisfied.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In large hydropower units, thrust bearings are key supporting components. Their main function is to bear the mass and axial water thrust of all rotating parts of the turbine generator and transfer the load to the foundation through the lower bracket. The operating status of the thrust bearings directly affects the safe and reliable operation of the turbine generator, so it is of great significance to monitor their operating status.

[0045] At present, there are two main types of thrust bearing support structures in large hydropower units: support bolts and spring bundles. The force monitoring technology of the support bolt type thrust bearing is simple and has been maturely applied. For the thrust bearing of the spring bundle structure, since there are more springs under each thrust bearing, the springs are subjected to greater force, resulting in a compact space under the thrust bearing, and traditional monitoring technology is difficult to achieve effective force monitoring.

[0046] Based on this, see Figure 1 , Figure 2 The embodiment of the present application provides a thrust washer force monitoring device for a spring bundle structure of a hydropower unit, including a base ring 6, the top of which is provided with a spring bundle assembly 5, a support washer 4 and a thrust washer 3 in sequence from bottom to top; the spring bundle assembly 5 includes a circle of spring bundle baffles 51 fixed on the top of the base ring 6 and a plurality of spring bundles 52 arranged in the spring bundle baffles 51 and tightly attached, and the two ends of the spring bundles 52 are respectively abutted against the base ring 6 and the support washer 4; a plurality of monitoring areas are arranged in the spring bundle baffles 51, and a spring bundle 52 in the monitoring area is an integrated sensor spring 53.

[0047] See also Figure 1The bottom of the foundation ring 6 is fixed with a lower frame 7 for supporting it, and the lower frame 7 is used to be fixedly connected to the foundation. The top of the foundation ring 6 is fixed with a spring bundle assembly 5, and a support shoe 4 is arranged on the top of the spring bundle assembly 5. The support shoe 4 is supported by the spring bundle assembly 5 at multiple points. Each support point has moderate stiffness and equal height, and can withstand thrust loads, balance the loads between each shoe, and absorb vibration to ensure stable operation. The thrust shoe 3 is fixed on the top of the support shoe 4, and a mirror plate 2 is arranged on the top of the thrust shoe 3 to match it, and the top of the mirror plate 2 is fixedly connected to the thrust head 1; when in use, the thrust shoe 3 works in cooperation with the mirror plate 2 to transfer the weight and axial water thrust of all rotating parts of the hydro-turbine generator by forming a thin layer of high-pressure oil film between the two, and transfer the load downward to the foundation.

[0048] See also Figure 2 The spring bundle assembly 5 includes a circle of spring bundle baffles 51 and a plurality of spring bundles 52; the circle of spring bundle baffles 51 is fixed on the top of the base ring 6, and the plurality of spring bundles 52 are arranged in the circle of spring bundle baffles 51, and the adjacent spring bundles 52 are close together; the spring bundles 52 are arranged vertically, the lower end of the spring bundles 52 abuts against the base ring 6, and the upper end of the spring bundles 52 abuts against the support 4. The circle of spring bundle baffles 51 may include an annular spring bundle baffle 51, or may be formed by splicing a plurality of spring bundle baffles 51. Exemplarily, the circle of spring bundle baffles 51 is formed by splicing 5 spring bundle baffles 51, and each spring bundle baffle 51 is fixedly connected to the base ring 6 by a plurality of bolts. By setting a plurality of spring bundles 52, it is used to support the support 4 at multiple points; by setting a spring bundle baffle 51, it is used to limit the horizontal direction of the spring bundle 52 to prevent the spring bundle 52 from horizontal displacement during operation.

[0049] See also Figure 2 , multiple monitoring areas are set in the spring bundle baffle 51, and a spring bundle 52 in each monitoring area is an integrated sensor spring 53. The integrated sensor spring 53 is not only used to support the support pad 4, but also can measure the change in the displacement of the thrust pad 3 and the base ring, and then obtain the force condition of the spring bundle 52 in the monitoring area. By setting multiple monitoring areas, it is used to perform multi-point monitoring of the force distribution of the thrust pad. By setting a spring bundle 52 in each monitoring area as an integrated sensor spring 53, the force condition of the spring bundle 52 in each monitoring area can be obtained. Exemplarily, eight monitoring areas are set in the spring bundle baffle 51, and the eight monitoring areas are used to realize the force monitoring of each position of the thrust pad 3.

[0050] In a certain large hydroelectric unit, each unit includes more than twenty thrust pads 3, and more than one hundred spring bundles 52 are arranged under each thrust pad 3 and support pad 4. Eight monitoring areas are arranged in the spring bundle baffle 51, and the spring bundle 52 in the center of each monitoring area is an integrated sensor spring 53. When the unit is running, the weight of the rotating part of the hydro-generator and the axial water thrust act on the mirror plate 2 through the thrust head 1. After the mirror plate 2 is stressed, the load is transferred to the thrust pad 3 through the high-pressure oil film between it and the thrust pad 3. After the thrust pad 3 is stressed, the load is transferred downward, and the load is transferred to the foundation through the support pad 4, the spring bundle 52, the foundation ring 6 and the lower frame 7 in turn. In this process, the integrated sensor spring 53 measures the stress of the spring bundle 52 in the corresponding monitoring area, and calculates the force distribution of the thrust pad 3 according to the position of each monitoring area and the stress of the spring bundle 52 therein. Through software system integration, it can be displayed in real time.

[0051] The thrust washer force monitoring device of the spring bundle structure of the hydropower unit provided in the embodiment of the present application is used to perform multi-point monitoring of the force condition of the thrust washer 3 by setting up multiple monitoring areas. By setting a spring bundle 52 in each monitoring area as an integrated sensor spring 53, the integrated sensor spring 53 can be used to measure the change in displacement between the thrust washer 3 and the base ring 6, and then the force condition of the spring bundle 52 in each monitoring area can be obtained. According to the position of each monitoring area and the force condition of the spring bundle 52 therein, the overall force distribution of the thrust washer can be calculated, thereby effectively realizing the force monitoring of the thrust washer.

[0052] Compared with the prior art, the present application does not change the overall force structure of the thrust washer 3, nor does it change the oil film state between the thrust washer 3 and the mirror plate 2. Under the premise of not affecting the stable operation of the thrust washer 3, the accurate monitoring of the force on the thrust washer 3 is achieved, thus solving the problem that the thrust washer with a spring bundle structure cannot perform effective force monitoring.

[0053] In some embodiments, see Figure 2 The integrated sensor spring 53 is in close contact with the surrounding spring bundle 52 .

[0054] Specifically, the outer dimensions of the integrated sensor spring 53 are consistent with those of the spring bundle 52. After the integrated sensor spring 53 is installed, the integrated sensor spring 53 is tightly attached to other spring bundles 52 around it without affecting the installation of other spring bundles 52, so that the spring bundle 52 can be used to limit the horizontal direction of the integrated sensor spring 53, thereby avoiding horizontal displacement of the integrated sensor spring 53 during operation and ensuring the accuracy of its measurement data.

[0055] In some embodiments, see Figure 3The integrated sensor spring 53 includes a vertically arranged support spring 531, a spring lower plate 532 connected to the lower end of the support spring 531, a spring upper plate 533 connected to the upper end of the support spring 531, and a displacement sensor 534 vertically arranged in the support spring 531; the lower end of the displacement sensor 534 is connected to the spring lower plate 532, and the upper end of the displacement sensor 534 passes through the spring upper plate 533 and abuts against the support pad 4. The sensor lead wire 535 of the displacement sensor 534 is led out from between the lower end of the support spring 531 and the spring lower plate 532, and is used to connect to the computer. Exemplarily, the upper end of the displacement sensor 534 can protrude 2mm from the top of the spring upper plate 533, and the elastic modulus of the support spring 531 is lower than the spring modulus of the spring bundle 52.

[0056] The integrated sensor spring 53 encapsulates a displacement sensor 534 in a supporting spring 531. The upper end of the displacement sensor 534 contacts the support valve 4. The supporting spring 531 supports the support valve 4, and the displacement sensor 534 measures the change in displacement between the support valve 4 and the base ring 6, that is, the displacement of the spring bundle 52. Since the force and displacement of the spring bundle 52 are linearly related, and the sizes and materials of each spring bundle 52 are consistent, the linear relationship is basically consistent. Therefore, by measuring the displacement of the spring bundle 52, the force of the spring bundle 52 can be calculated.

[0057] Exemplarily, the displacement sensor 534 includes an LVDT sensor. The output signal of the LVDT sensor shows an excellent linear relationship with the measured displacement, with small measurement error, high measurement accuracy, and easy packaging. The protection level requirement of the displacement sensor 534 is IP68, which allows it to adapt to the medium turbine oil, and can accurately measure even in the case of oil splashing, meeting the requirements of the specific use environment. For example, a certain model of LVDT sensor has an adaptable temperature of -1°C-60°C, a measurement accuracy of 1μm, and a range of 10mm.

[0058] The spring lower plate 532 and the spring upper plate 533 both include a plurality of overlapping washers, wherein the washers are 40Cr washers. By providing a plurality of washers, the height of the integrated sensor spring 53 can be flexibly adjusted according to actual conditions.

[0059] An embodiment of the present application also provides a method for monitoring the force of a thrust washer of a spring bundle structure of a hydropower unit, using a device for monitoring the force of a thrust washer of a spring bundle structure of a hydropower unit; the method includes: obtaining the position and deformation of an integrated sensor spring 53; and calculating the force distribution of the thrust washer 3 according to the position and deformation of the integrated sensor spring 53.

[0060] The method for monitoring the force of the thrust washer of the spring bundle structure of a hydropower unit provided in the embodiment of the present application utilizes the linear relationship between the force and displacement of the spring bundle. The force condition of the spring bundle 52 in the corresponding monitoring area can be calculated through the deformation of the integrated sensor spring 53. According to the position of each monitoring area and the force condition of the spring bundle 52 therein, the force distribution of the thrust washer 3 is calculated by integration means. Through software system integration, it can be displayed in real time on the terminal, making it convenient for workers to inquire about the force condition of the thrust washer 3.

[0061] The monitoring method of the present application can effectively monitor the stress of the thrust washer of the spring bundle structure, ensure the overall safe operation of the thrust washer, and solve the limitation of the extremely small measuring space under the thrust washer. It is of great significance for the horizontal adjustment of the mirror plate during maintenance, the understanding of the operating stress condition of the thrust washer, and the stable operation of the unit.

[0062] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A thrust bearing force monitoring device for a spring bundle structure of a hydropower unit, characterized in that: It comprises a base ring (6), the top of which is provided with a spring bundle assembly (5), a support pad (4) and a thrust pad (3) in sequence from bottom to top; The spring bundle assembly (5) comprises a circle of spring bundle baffles (51) fixed on the top of the base ring (6) and a plurality of spring bundles (52) arranged in the spring bundle baffles (51) and tightly attached thereto, wherein two ends of the spring bundles (52) are respectively in contact with the base ring (6) and the support bearing (4); A plurality of monitoring areas are arranged in the spring bundle baffle (51), and one of the spring bundles (52) in the monitoring area is an integrated sensor spring (53).

2. The thrust bearing force monitoring device of the spring bundle structure of a hydropower unit according to claim 1 is characterized in that: The integrated sensor spring (53) is in close contact with the surrounding spring bundle (52).

3. The thrust bearing force monitoring device of the spring bundle structure of a hydropower unit according to claim 1 is characterized in that: The integrated sensor spring (53) comprises a vertically arranged support spring (531), a spring lower plate (532) connected to the lower end of the support spring (531), a spring upper plate (533) connected to the upper end of the support spring (531), and a displacement sensor (534) vertically arranged in the support spring (531); the lower end of the displacement sensor (534) is connected to the spring lower plate (532), and the upper end of the displacement sensor (534) passes through the spring upper plate (533) and abuts against the support pad (4).

4. The thrust bearing force monitoring device for the spring bundle structure of a hydroelectric generator set according to claim 3 is characterized in that: The displacement sensor (534) includes an LVDT sensor.

5. The thrust bearing force monitoring device of the spring bundle structure of a hydroelectric generator set according to claim 4 is characterized in that: The protection grade requirement of the displacement sensor (534) is IP68.

6. The thrust bearing force monitoring device for the spring bundle structure of a hydroelectric generator set according to claim 3 is characterized in that: The spring lower plate (532) and the spring upper plate (533) both include a plurality of overlapping washers.

7. The thrust bearing force monitoring device for the spring bundle structure of a hydroelectric generator set according to claim 6 is characterized in that: The washers are 40Cr washers.

8. The thrust bearing force monitoring device for the spring bundle structure of a hydroelectric generator set according to claim 1 is characterized in that: Eight monitoring areas are arranged in the spring bundle baffle (51).

9. The thrust bearing force monitoring device of the spring bundle structure of a hydroelectric generator set according to claim 1 is characterized in that: The spring bundle baffle (51) is connected to the base ring (6) via bolts.

10. A method for monitoring the force of a thrust bearing of a spring bundle structure of a hydropower unit, characterized in that: A thrust washer force monitoring device for a spring bundle structure of a hydropower unit according to any one of claims 1 to 9 is used; the method comprises: obtaining the position and deformation of the integrated sensor spring (53); and calculating the force distribution of the thrust washer (3) according to the position and deformation of the integrated sensor spring (53).

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