Hydraulic bolt stretching device for armature of exciter of nuclear power plant

Abstract

The utility model relates to a hydraulic bolt stretching device for an exciter armature of a nuclear power plant, which comprises a hydraulic pump and two or more stretchers, and the at least two stretchers are respectively communicated with the output end of the hydraulic pump through pipelines and are arranged on different hydraulic bolts. During use, when the number of the stretchers is two, the connecting line of the hydraulic bolts connected with the two stretchers passes through the midpoint of the section of the exciter armature. According to the utility model, the end face of the exciter armature and the end face of the generator rotor can move relatively in parallel in the stretching process, and the situations of out-of-tolerance fitting of the end face of the armature and the wheel face of the wheel pair and improper stretching are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of exciters for nuclear power plants, in particular to an armature hydraulic bolt tensioning device for exciters for nuclear power plants. Background Art

[0002] The exciter armature is fastened by hydraulic bolts and hung on the generator rotor wheel. There are no traditional positioning pins between the armature and the generator rotor. The installation process is complicated and requires high precision. During the armature installation process, it is necessary to ensure that the armature end face and the generator rotor wheel face are aligned and fully fitted, and all bolt holes are fully aligned.

[0003] The existing bolt tensioning tool is composed of a pneumatic hydraulic pump, a hydraulic oil pipe, a hydraulic tensioning head, and a compressed air pipe. The hydraulic tensioning head is prone to malfunction and can only tension one bolt at a time, which easily leads to the armature end face and the wheel surface fitting out of tolerance and inadequate tensioning. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a hydraulic bolt tensioning device for the armature of an exciter of a nuclear power plant.

[0005] The utility model adopts the following technical solutions:

[0006] A nuclear power plant exciter armature hydraulic bolt tensioning device is constructed, wherein a plurality of hydraulic bolts are evenly spaced along the circumference of the exciter armature, and the nuclear power plant exciter armature hydraulic bolt tensioning device comprises:

[0007] A hydraulic pump and two or more tensioners, wherein the tensioners are respectively connected to the output end of the hydraulic pump through pipelines and are arranged on different hydraulic bolts;

[0008] Wherein, when in use, when the number of the tensioners is two, the connection line of the hydraulic bolts connected to the two tensioners passes through the midpoint of the armature cross section of the exciter.

[0009] In some embodiments, at least two micrometers are further included, and the micrometers are arranged in a one-to-one correspondence with the stretchers.

[0010] In some embodiments, the micrometer includes a meter body and a meter base, the meter body is arranged on the tensioner, and the meter base is connected to the meter body and is arranged on the end face of the exciter armature.

[0011] In some embodiments, the hydraulic pump is an electric hydraulic pump.

[0012] In some embodiments, a control device is further included, wherein the control device includes a hydraulic pump control module for controlling the hydraulic pump, and the hydraulic pump control module is electrically connected to the hydraulic pump.

[0013] In some embodiments, a control device is further included, wherein the control device includes a dial gauge control module for monitoring changes in the dial gauge value, and the dial gauge control module is electrically connected to the dial gauge.

[0014] In some embodiments, the control device further comprises a hydraulic pump control module for controlling the hydraulic pump, the hydraulic pump control module being electrically connected to the hydraulic pump;

[0015] The micrometer control module is electrically connected to the hydraulic pump control module so as to control the hydraulic pump to be turned off through the hydraulic pump control module after monitoring that the micrometer reaches a target change value.

[0016] In some embodiments, the hydraulic pump is provided with a pressure sensor, and the pressure sensor is electrically connected to the hydraulic pump control module, so that when the pressure received by the pressure sensor is greater than a set pressure, the hydraulic pump control module controls the hydraulic pump to adjust the tensioner.

[0017] In some embodiments, the control device further comprises a display panel, and an audible and visual alarm is arranged on the display panel to issue an audible and visual alarm when the pressure received by the pressure sensor is greater than the set pressure.

[0018] In some embodiments, the stretcher is an automatic pressure-relieving stretcher.

[0019] The utility model has the following advantages:

[0020] The utility model constructs two or more tensioners which are respectively connected to the hydraulic pump. When there are two tensioners, the hydraulic bolt connection line connected to the tensioners passes through the midpoint of the exciter armature cross section during use, thereby ensuring that the end face of the exciter armature can move relatively parallel to the end face of the generator rotor during the stretching process, thereby avoiding the situation where the armature end face and the wheel face are out of tolerance and the stretching is not in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] Figure 1 It is a three-dimensional structural schematic diagram of a hydraulic bolt tensioning device for an armature of an exciter of a nuclear power plant in one embodiment of the utility model;

[0023] Figure 2 yes Figure 1 The schematic diagram of the use status of the hydraulic bolt tensioning device of the armature of the nuclear power plant exciter shown;

[0024] Figure 3 yes Figure 1 The structure schematic diagram of the tensioner and micrometer of the hydraulic bolt tensioning device of the armature of the nuclear power plant exciter is shown. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside", "inside", "outside", etc. are based on the directions or positional relationships shown in some of the drawings, and are constructed and operated in a specific direction. They are only for the convenience of describing the present technical solution, and do not indicate that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0026] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0027] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0028] Figure 1The utility model shows a nuclear power plant exciter armature hydraulic bolt tensioning device in one embodiment, wherein the nuclear power plant exciter armature has a plurality of hydraulic bolts, and the plurality of hydraulic bolts are evenly spaced along the circumference of the exciter armature. The device can tension the bolts of the nuclear power plant exciter armature to align the end face of the armature with the wheel face of the generator rotor and completely fit the armature, thereby completing the installation of the armature.

[0029] This embodiment will be described by taking the brushless exciter in the EPR unit (European Pressurized Reactor, i.e. the third and fourth nuclear power technology units under construction in the world) of a nuclear power plant as an example.

[0030] Read also Figure 2 In this unit, the exciter armature and the generator rotor wheel pair are connected by twenty hydraulic bolts and twenty-three expansion pins. The twenty hydraulic bolts are evenly spaced in a circular ring along the circumference of the exciter armature, and each hydraulic bolt is symmetrically arranged with another hydraulic bolt along the diameter of the exciter armature section. The twenty hydraulic bolts form ten symmetrically arranged bolt groups.

[0031] The nuclear power plant exciter armature hydraulic bolt tensioning device comprises a hydraulic pump 1 and two or more tensioners 2. The at least two tensioners 2 are respectively connected to the output end of the hydraulic pump 1 through pipelines and can be selectively arranged on different hydraulic bolts to synchronously tension them.

[0032] When in use, when there are two tensioners 2, the connection line of the hydraulic bolts connected to the two tensioners 2 passes through the midpoint of the cross section of the exciter armature, so as to ensure that the end faces between the exciter armature and the generator rotor can always remain parallel during the process of stretching and adjusting the spacing, and avoid the loosening of the bolts after stretching due to the inclination of the end faces, resulting in the situation of insufficient stretching, insufficient end face fitting, and excessive fitting.

[0033] In this embodiment, the number of the tensioners 2 is two, and correspondingly, the number of the output port of the pump body 11 of the hydraulic pump 1 and the number of the connecting pipes 12 are two, and the two tensioners 2 are respectively connected to the two output ports through the two connecting pipes 12. The two tensioners 2 can be selectively arranged on two hydraulic bolts, and the connecting parts of the two hydraulic bolts arranged each time pass through the midpoint of the armature section of the exciter, that is, the two tensioners 2 can be selectively arranged on the two hydraulic bolts of a bolt group each time.

[0034] In some other optional embodiments, the number of the stretchers 2 can also be set to three or more, and correspondingly, the number of the output ports of the pump body 11 of the hydraulic pump 1 and the number of the connecting pipes 12 are also set to three or more, so that multiple stretchers 2 can stretch multiple hydraulic bolts at the same time. When conditions permit and there is sufficient operating space, the more hydraulic bolts are stretched at the same time, the more parallel movement of the end faces can be guaranteed, and the better the stretching effect, and the efficiency will be improved accordingly.

[0035] It should be understood that when the number of the tensioners 2 is three or more, the three or more tensioners 2 can define a surface no matter how they are connected to the hydraulic bolts arranged in a circular shape. Therefore, the relative position of the hydraulic bolts connected to the tensioners 2 is not limited, and the end faces between the exciter armature and the generator rotor can be kept parallel during the stretching process.

[0036] The hydraulic pump 1 includes a pump body 11 and at least two connecting pipes 12. The pump body 11 is provided with at least two output ports. One end of the connecting pipe 12 is connected to the output port of the pump body 11, and the other end is connected to the tensioner 2. The tensioner 2 is provided on the hydraulic bolt, and the hydraulic bolt is stretched by the driving of the hydraulic pump 1.

[0037] In some embodiments, the hydraulic pump 1 is an electric hydraulic pump, which can solve the problem of tight compressed air supply in the nuclear power plant and inability to work normally due to insufficient gas pressure when using a pneumatic hydraulic pump, and is not affected by the gas supply pressure and position of the nuclear power plant.

[0038] In this embodiment, the stretcher 2 is an automatic pressure relief stretcher, which can automatically relieve pressure after the stretching is completed, without the need for the operator to manually reset the stretcher 2, thereby improving the operating efficiency.

[0039] In some embodiments, the nuclear power plant exciter armature hydraulic bolt tensioning device also includes at least two micrometers 2, and the micrometer 3 is set corresponding to the tensioner 2, which is used to measure the tensioning amount of the hydraulic bolt by the tensioner 2, ensuring that the tensioning amount of the two hydraulic bolts is consistent each time, avoiding insufficient tensioning or excessive tensioning.

[0040] Specifically, see Figure 3 The micrometer 3 includes a meter body 31 and a meter base 32 , wherein the meter body 31 is arranged on the tensioner 2 , and the meter base 32 is arranged on the end surface of the exciter armature and connected to the meter body 31 .

[0041] In this embodiment, the number of the micrometers 3 is also two, which are respectively arranged corresponding to the two stretchers 2.

[0042] It should be understood that the micrometer 3 can adopt the existing technology.

[0043] For example Figure 1 As shown, in some embodiments, the nuclear power plant exciter armature hydraulic bolt tensioning device further includes a control device 4, which includes a hydraulic pump control module 41 for controlling the start and stop of the hydraulic pump 1. The hydraulic pump control module 41 is electrically connected to the hydraulic pump 1.

[0044] Specifically, for example, in some embodiments, the hydraulic pump control module 41 is a hydraulic pump switch, and the start and stop of the hydraulic pump 1 are controlled by operating the hydraulic pump switch.

[0045] In some embodiments, a pressure sensor (not shown in the figure) is provided on the hydraulic pump 1, and the pressure sensor is electrically connected to the hydraulic pump control module 41 so that when the pressure received by the pressure sensor is greater than the set pressure, the hydraulic pump control module 41 is adjusted or shut down.

[0046] It should be understood that when the hydraulic pump control module 41 is connected to a pressure sensor, the hydraulic pump control module 41 is not limited to including a hydraulic pump switch.

[0047] In some embodiments, the control device 4 further includes a dial gauge control module (not shown in the figure) for monitoring the value change of the dial gauge 3 to ensure that each stretching value of the plurality of bolt groups is consistent. The dial gauge control module is electrically connected to the dial gauge 3.

[0048] In this embodiment, the dial gauge control module realizes electrical signal connection with the two dial gauges 3 respectively through Bluetooth connection to receive data change signals of the dial gauges 3 .

[0049] In some other optional embodiments, the dial gauge control module may also be electrically connected to the dial gauge 3 by means of cable connection or the like.

[0050] In some embodiments, the micrometer control module is also electrically connected to the hydraulic pump control module 41, so that after monitoring that the numerical change of the micrometer 3 reaches the target change value, the hydraulic pump control module 41 controls the hydraulic pump 1 to be shut down, so that the tensioner 2 stops stretching the hydraulic bolt, and then the stretching value of the hydraulic bolt by the tensioner 3 can be accurately controlled to ensure that the stretched amount of each hydraulic bolt is consistent.

[0051] The control device 4 further comprises a display panel 42 , on which an audible and visual alarm (not shown) is arranged, so as to issue an audible and visual alarm for reminder when the pressure monitored by the pressure sensor is greater than a set pressure.

[0052] It should be understood that the "set pressure" refers to the tensioning pressure required by the tensioner 2 to stretch the hydraulic bolt, that is, the target pressure that the hydraulic pump needs to provide. The "pressure monitored by the pressure sensor" refers to the tensioning pressure when the tensioner 2 stretches the hydraulic bolt, that is, the pressure provided by the hydraulic pump in real time.

[0053] In some embodiments, the control device 4 can also record the number of stretching times, stretching hydraulic bolt number, stretching pressure, upper pressure limit, nuclear power plant name, unit number, equipment code and operator, and overpressure alarm light parameters through the display panel 42. The stretching data can also be saved and curves can be generated to facilitate data search, analysis and archiving.

[0054] In some embodiments, the control device 4 can also automatically record the hydraulic bolt tension through the micrometer control module, thereby improving installation efficiency, reducing measurement errors, and improving installation accuracy.

[0055] It should be understood that the hydraulic pump 1, the tensioner 2 and the micrometer 3 can all adopt existing technologies to achieve the above-mentioned effects.

[0056] During specific use, it is first necessary to connect the hydraulic pump 1, two tensioners 2, the micrometer 3 and the control device 4, and install the two tensioners 2 on the two hydraulic bolts of the same bolt group respectively, and install the base 32 of the micrometer 3 on the end face of the exciter armature.

[0057] Furthermore, the micrometer 3 is turned on and reset to zero, so that the micrometer 3 is connected to the micrometer control module via Bluetooth, and the stretching parameters are set through the control device 4.

[0058] Furthermore, the control device 4 is operated through the display panel 42 to control the hydraulic pump 1 to start, and the two tensioners 2 simultaneously tension the two hydraulic bolts.

[0059] It should be understood that during the stretching process, the micrometer control module monitors the data changes of the micrometer 3 in real time to calculate the stretching amount of the hydraulic bolt.

[0060] Furthermore, when it is monitored that the stretching amount of the hydraulic bolt reaches the target stretching amount, the hydraulic pump 1 is controlled to stop through the hydraulic pump control module 41, the two tensioners 2 are automatically depressurized, and the two tensioners 2 and the base 32 of the micrometer 3 are removed from the hydraulic bolt and the end face of the exciter armature respectively.

[0061] Further, another group of bolts is stretched, and the above steps are repeated until all the bolts between the exciter armature and the generator rotor are stretched, and the operation is terminated.

[0062] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A hydraulic bolt tensioning device for an exciter armature of a nuclear power plant, wherein a plurality of hydraulic bolts are evenly spaced along the circumference of the exciter armature, characterized in that: include: A hydraulic pump (1) and two or more tensioners (2), wherein the tensioners (2) are respectively connected to the output end of the hydraulic pump (1) through pipelines and are arranged on different hydraulic bolts; Wherein, when in use, when the number of the tensioners (2) is two, the connection line of the hydraulic bolts connected to the two tensioners (2) passes through the midpoint of the armature cross section of the exciter.

2. The hydraulic bolt tensioning device for armature of an exciter of a nuclear power plant according to claim 1, characterized in that: It also comprises at least two micrometers (3), wherein the micrometers (3) are arranged in one-to-one correspondence with the stretchers (2).

3. The hydraulic bolt tensioning device for armature of an exciter of a nuclear power plant according to claim 2, characterized in that: The micrometer (3) comprises a meter body (31) and a meter base (32); the meter body (31) is arranged on the tensioner (2); the meter base (32) is connected to the meter body (31) and is arranged on the end surface of the exciter armature.

4. The hydraulic bolt tensioning device for armature of an exciter of a nuclear power plant according to claim 1, characterized in that: The hydraulic pump (1) is an electric hydraulic pump.

5. The hydraulic bolt tensioning device for armature of an exciter of a nuclear power plant according to claim 1, characterized in that: It also comprises a control device (4), wherein the control device (4) comprises a hydraulic pump control module (41) for controlling the hydraulic pump (1), and the hydraulic pump control module (41) is electrically connected to the hydraulic pump (1).

6. The hydraulic bolt tensioning device for armature of an exciter of a nuclear power plant according to claim 2, characterized in that: It also comprises a control device (4), wherein the control device (4) comprises a dial gauge control module for monitoring the value change of the dial gauge (3), and the dial gauge control module is electrically connected to the dial gauge (3).

7. The hydraulic bolt tensioning device for armature of an exciter of a nuclear power plant according to claim 6, characterized in that: The control device (4) further comprises a hydraulic pump control module (41) for controlling the hydraulic pump (1), wherein the hydraulic pump control module (41) is electrically connected to the hydraulic pump (1); The dial gauge control module is electrically connected to the hydraulic pump control module (41) so as to control the hydraulic pump (1) to be turned off through the hydraulic pump control module (41) after monitoring that the dial gauge (3) reaches a target change value.

8. The hydraulic bolt tensioning device for armature of an exciter of a nuclear power plant according to claim 7, characterized in that: The hydraulic pump (1) is provided with a pressure sensor, and the pressure sensor is electrically connected to the hydraulic pump control module (41) so that when the pressure received by the pressure sensor is greater than a set pressure, the hydraulic pump control module (41) controls the hydraulic pump (1) to adjust the tensioner (2).

9. The hydraulic bolt tensioning device for armature of an exciter of a nuclear power plant according to claim 8, characterized in that: The control device (4) further comprises a display panel (42), on which an audible and visual alarm is arranged, so as to issue an audible and visual alarm when the pressure received by the pressure sensor is greater than the set pressure.

10. The hydraulic bolt tensioning device for armature of an exciter of a nuclear power plant according to claim 1, characterized in that: The stretcher (2) is a stretcher capable of automatically releasing pressure.

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