JP3978558B2 - Rotating device for centering - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating device for centering that rotates a rotating shaft for centering, and in particular, connects an impeller shaft of a recirculation pump that circulates coolant to a nuclear reactor and a spindle of a motor. The present invention relates to a rotation device for centering for the purpose.
[0002]
[Prior art]
For example, a boiling water nuclear power plant is a type of power plant in which a coolant is boiled in a nuclear reactor and the steam is directly sent to a turbine generator. This boiling water nuclear power plant is controlled by adjusting the position of the control rod and the flow rate of the coolant flowing through the reactor core, and has not only self-controllability but also excellent responsiveness in terms of power control. ing. For this reason, the reactor coolant recirculation system that feeds coolant to the core is one of the important systems and requires high reliability and controllability.
[0003]
The reactor coolant recirculation system mainly includes a recirculation pump that forcibly returns coolant sent from the reactor to the reactor, and a motor that is installed above the recirculation pump and rotates the impeller of the recirculation pump. It is composed of The recirculation pump and the motor need to be accurately aligned and connected to the impeller shaft and the motor spindle in order to reliably control the circulation amount of the coolant without leakage of the coolant. Is done.
[0004]
Therefore, conventionally, a rotating jig is attached to the upper end of the spindle of the motor, and an operator rotates the spindle through the rotating jig, and a connecting portion between the spindle and the shaft of the impeller is provided below the motor. It was adjusted and centered.
[0005]
[Problems to be solved by the invention]
However, many coolant circulation motors used in nuclear power plants are very large and require a great deal of labor, for example, four workers to rotate the motor spindle.
Also, the upper part of the motor is close to a riser pipe (pipe for feeding coolant into the core) connected to the core of the nuclear reactor, so it is a high radiation area. Therefore, it has been desired to reduce the exposure dose of workers.
[0006]
For this reason, there has been a demand for a rotating device capable of mechanizing the rotating operation of rotating the spindle of the motor for centering. However, when the spindle is rotated by a rotating device, there is a problem that if the rotating core of the rotating device and the rotating core of the spindle are not accurately centered and installed, an excessive load is applied to the motor spindle and the motor is damaged. appear. For this reason, it is necessary to center the rotating device and the spindle before aligning the spindle and the impeller, and a large amount of labor and time is spent on the centering work. There was no mechanization.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a rotating device for centering which can rotate a rotating shaft for centering and can perform centering work efficiently. .
[0008]
[Means for solving the problems]
In order to achieve the above-mentioned object, the present invention provides a rotating device for centering that is attached to one rotating shaft of a pair of rotating shafts that require centering for connection and rotates the rotating shaft. The rotating device includes: a connecting member that is an end of the one rotating shaft and is attached to the other end of the connecting end of the pair of rotating shafts ; and a rotating body that is engaged with the connecting member. An apparatus main body rotatably supported; and a drive unit having a rotation drive source for rotating the rotating body, wherein the end of the one rotation shaft and the connecting member are orthogonal to the one rotation shaft. The connecting member and the rotating body are arranged in a direction orthogonal to the one rotating shaft and the pin, and are supported by the rotating body. , is formed in the connecting member, the rod member is engaged It is connected via the groove for supporting the direction perpendicular to the rod member to the rotating shaft and the pin of the one by being, rods the connecting member is engaged with the groove by rotating the rotary body It rotates through a member, It is characterized by the above-mentioned.
[0009]
According to the present invention, a rotating device is attached to one rotating shaft of a pair of rotating shafts that require centering, and the centering is performed while rotating the rotating shaft by the rotating device. In this alignment, a pin and a rod member that freely supports the rotation shaft are incorporated in the power transmission mechanism that transmits the rotational power of the rotation drive source to the rotation shaft. Even if they are not completely coincident with each other, it is possible to smoothly transmit the rotational power of the rotational drive source to the rotational shaft without applying an excessive force to the rotational shaft.
[0010]
Further, since the rotation of the drive shaft is performed by a rotational drive source, it is possible to reduce labor and time required for the centering operation. Furthermore, by mechanizing the rotating operation of the rotating shaft for center alignment, the rotating operation can be remotely operated, and it is possible to cope with work in a dangerous place. The structure having the pin and rod members, because they are integrated in the in the power transmission mechanism can be made compact rotation device as compared with a case of providing a different number.
[0011]
According to the invention of claim 3, since the rotational speed can be changed according to the progress of the centering operation, the centering operation can be performed more quickly.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a centering rotating device according to the present invention will be described below with reference to the accompanying drawings.
First, the recirculation pump 12 and the motor 16 that require centering by the rotating device 10 according to the present invention will be described.
[0013]
FIG. 1 is an explanatory diagram for explaining a reactor coolant recirculation system, and FIG. 2 is a schematic configuration diagram of a recirculation pump 12 and a motor 16.
As shown in FIG. 1, the reactor 20 of the boiling water nuclear power plant has a return pipe 24 connected to a pressure vessel 22. The return pipe 24 is connected to the feed pipe 26 via the recirculation pump 12, and the feed pipe 26 is connected to the inside of the pressure vessel 22 via a branch pipe 28 called a header pipe and a plurality of riser pipes 30, 30. Connected to a core portion (not shown). Further, a motor 16 is connected to the recirculation pump 12 at an upper portion, and the cooling water in the return pipe 24 is fed into the feed pipe 26 by driving the motor 16. Thereby, the cooling water in the pressure vessel 22 is forcibly circulated by the recirculation pump 12, and the output control of the power plant is performed by manipulating the circulation amount.
[0014]
2, the motor 16 has a spindle 18 provided with a rotor 18A connected to an impeller shaft 14 of the recirculation pump 12 through a flange 18B at the lower end thereof. A centering jig 32 is attached to a connecting portion between the spindle 18 of the motor 16 and the shaft 14 of the impeller. By operating the centering jig 32, the spindle 18 of the motor 16 and the impeller shaft are connected. Centering of the shaft 14 is performed. As described above, since the reactor coolant recirculation system affects the power control of the power plant, the spindle 18 and the impeller shaft 14 need to be accurately aligned and connected.
[0015]
This centering operation is performed by adjusting the centering jig 32 while rotating the spindle 18 of the motor 16 at a low speed. Hereinafter, the rotating device 10 that rotates the spindle 18 of the motor 16 for centering will be described.
FIG. 3 is a side view of the rotating device 10 according to the present invention, and FIGS. 4, 5, and 6 are cross-sectional views taken along lines AA, BB, and CC in FIG. 3, respectively. 3 shows a cross section DD (FIG. 5) for explaining the drive mechanism.
[0016]
As shown in FIG. 3, the rotating device 10 includes a drive unit 36, a power transmission mechanism including a device main body 38 and a connecting member 40, and a fixing jig 42. The fixing jig 42 is formed of a mounting table 44 on which the apparatus main body 38 is mounted, and four fixing plates 46, 46,... Connected to the lower surface of the mounting table 44, and the four fixing plates 46, The lower ends of 46,... Are fixed to the casing 16A (see FIG. 2) of the motor 16 to be attached to the motor 16. Further, the fixing jig 42 is configured to support the spindle 18 of the motor 16 via a bearing (not shown) so as to be rotatable and the mounting portion 18B at the end thereof to protrude. Yes. A pair of holes 18A and 18A are formed in the mounting portion 18B of the spindle 18 at opposing positions, and the pair of pins 48 and 48 can be detachably fitted.
[0017]
The connecting member 40 is formed so as to cover the mounting portion 18A of the spindle 18 from above. Further, a pair of holes 40A and 40A are formed on the side surface of the connecting member 40 at opposing positions so that the above-described pin 48 can be inserted. Thereby, the connecting member 40 is covered with the mounting portion 18B of the spindle 18 of the motor 16, and the pair of pins 48 and 48 are inserted into the pair of holes 40A and 40A, respectively, to the pair of holes 18A and 18A of the mounting portion 18B. When fitted, the spindle 18 of the motor 16 is swingably supported by the connecting member 40 around a swing shaft formed by the pair of pins 48 and 48. Here, a straight line parallel to the swing axis formed by the pair of pins 48 is defined as the X axis.
[0018]
In addition, a groove 40B for engaging the bar member 50 from above is formed in the upper portion of the connecting member 40. The groove 40B is formed so as to support the engaged bar member 50 vertically and horizontally with respect to the X axis. Further, the rod member 50 is supported by a rotating body 52 described later, whereby when the rotating body 52 is rotated, the connecting member 40 rotates via the rod member 50 engaged with the groove 40B. Further, since the connecting member 40 and the rod member 50 of the rotating body 52 are merely engaged, the connecting member 40 is swingably supported by the rotating body 52 around the swing shaft formed by the rod member 50. Is done. Here, a straight line parallel to the swing axis formed by the rod member 50 is defined as a Y axis, and a vertical direction is defined as a Z axis. The connection between the spindle 18 and the connecting member 40 and the connection between the connecting member 40 and the rotating body 52 will be described in detail later.
[0019]
The apparatus main body 38 is formed in a shape that can be mounted on the mounting table 44 of the fixing jig 42 from above, and is configured so that the mounted apparatus main body 38 can be fixed to the fixing jig 42. That is, four fixing members 54, 54,... Are attached to the apparatus main body 38, and are arranged at positions corresponding to the four fixing plates 46, 46,. As shown in FIG. 4, the fixing member 54 is configured such that the bolts 56 and 56 are screwed to sandwich the fixing plate 46 and the bolt 58 is screwed to bring the front end of the bolt 58 into contact with the mounting table 44. It is attached to the fixing jig 42.
[0020]
The apparatus main body 38 has a hollow rotating body 52 rotatably supported therein. As described above, the rotating member 52 has the rod member 50 installed therein, and teeth are formed on the outer peripheral surface. Further, as shown in FIG. 6, four gears 60A, 60A, 60B, and 60B that mesh with the teeth of the rotating body 52 are provided inside the apparatus main body 38, and the positions facing each other. The gears 60A, 60A or 60B, 60B arranged in the same shape are formed in the same shape. The axles 64A and 64B that support the gears 60A and 60B are rotatably supported by the apparatus main body 38 via bearings, and the gears 62A and 62B are disposed above the gears 60A and 60B on the axles 64A and 64B. It is supported. As shown in FIG. 5, the gears 62 </ b> A and 62 </ b> B are formed so that the gears arranged facing each other have the same shape and are supported at the same height.
[0021]
The drive unit 36 includes a disk-shaped table 66, an elevating device 70 that moves the table 66 up and down via a support column 68, and two centering units disposed at opposing positions on the table 66. The motor 72 is composed of 72. A convex portion 66A is formed on the lower surface of the table 66, and when the table 66 is lowered by the elevating device 70, the convex portion 66A has a gap in a hole 38A formed in the upper center of the apparatus main body 38. Configured to be inserted. Further, the drive shafts 74, 74 of the centering motors 72, 72 are installed such that their tips protrude below the table 66, and gears 76, 76 are attached to these tips. Holes 38B are formed in the apparatus main body 38 in correspondence with the gears 76, 76. When the table 66 is lowered by the lifting device 70, the gears 76, 76 reach the same height as the gears 62A, 62B. Descend.
[0022]
The table 66 is swingably supported by a support column 68. By swinging the lowered table 66, the gears 76 and 76 at the tip of the drive shaft 74 are moved to the gears 62A and 62A or the gears 62B and 62B. Can be engaged. Then, for example, as shown in FIG. 5, when the gear 76 (only one side is shown) is engaged with the gear 62B and the drive shafts 74, 74 are rotated by the motors 72, 72 in this state, the gear 76, the gear 62B, and The rotating body 52 can be rotated via the gear 60B. Similarly, even if the gear 76 is engaged with the gear 62A and the drive shaft 74 is rotated, the rotating body 52 can be rotated via the gear 76, the gear 62A, and the gear 60A.
[0023]
Incidentally, the gear 60A is formed with a larger diameter than the gear 62A, and the gear 60B is formed with a smaller diameter than the gear 62B. Thereby, when the rotating body 52 is rotated by engaging the gear 76 with the gear 62A, the rotating body 52 rotates at a higher speed than when the gear 76 is engaged with the gear 62B.
The drive unit 36 is connected to an operation pendant 80 installed below the motor 16 via a cable 78 (see FIG. 2). By operating the operation pendant 80, the lift operation of the lift device 70 and the table 66 are controlled. It is comprised so that rocking operation can be performed. That is, the operation pendant 80 can be used to operate the rotation of the rotating body 52 and the adjustment of the rotation speed. Therefore, by operating the operation pendant 80, the spindle 18 of the motor 16 connected to the rotating body 52 can be rotated, and the rotation speed can be adjusted.
[0024]
7 and 8 are explanatory views for explaining a connection structure between the rotating body 52 and the spindle 18.
As shown in these drawings, the spindle 18 is inserted into the connecting member 40 with a slight gap. Similarly, the connecting member 40 is inserted into the rotating body 52 with a slight gap. Further, as described above, the spindle 18 and the connecting member 40 are connected by the pins 48 and 48 so as to be swingable in the direction of the arrow 86, and the connecting member 40 and the rotating body 52 are swinged by the bar member 50 in the direction of the arrow 88. It is supported freely. As a result, the spindle 18 and the connecting member 40, and the connecting member 40 and the rotating body 52 can swing within a range where the mutual members abut. Therefore, the spindle 18 and the rotating body 52 are connected via the universal joint structure, and the rotational force of the rotating body 52 can be smoothly transmitted to the spindle 18.
[0025]
Next, the operation of the rotating device configured as described above will be described.
First, the fixing plate 46 of the fixing jig 42 is attached to the casing 16 </ b> A of the motor 16, and the fixing jig 42 is fixed. Next, the connecting member 40 is covered with the mounting portion 18B of the spindle 18, and the pins 48 and 48 are inserted into the holes 40A and 40A to be fitted into the holes 18A and 18A. As a result, the connecting member 40 is swingably attached to the spindle 18.
[0026]
Next, the apparatus main body 38 is mounted on the mounting table 44 while the rod member 50 installed on the rotating body 52 is engaged with the groove 40 </ b> B of the connecting member 40. Then, the bolts 56 and 56 and the bolt 58 of the fixing member 54 are fastened to fix the apparatus main body 38 to the fixing jig 42.
After the fixing jig 42, the connecting member 40, and the apparatus main body 38 are attached as described above, the rotating device 10 is operated as follows with the operation pendant 80 to align the spindle 18 with the shaft 14 of the impeller. Rotate to That is, first, the table 60 of the drive unit 36 is lowered by the elevating device 70, and the convex portion 66A is inserted into the hole 38A and the drive shaft 74 is inserted into the hole 38B. Then, the table 66 is swung around the support column 68 to engage the gear 76 with the gear 62B.
[0027]
Next, the centering motors 72 and 72 are driven to rotate the gears 76 and 76. When the gears 76 and 76 are rotated, the gear 62B meshed with the gears 76 and 76 rotates together with the gear 60B, and the rotating body 52 rotates at a relatively low speed. When the rotating body 52 rotates, the spindle 18 connected to the rotating body 52 via the rod member 50, the connecting member 40, and the pair of pins 48, 48 rotates. At this time, since the rotating body 52 and the spindle 18 are connected via the universal joint structure as described above, the rotational force of the rotating body 52 is smoothly transmitted to the spindle 18 and the motor 16 is not damaged. Further, since the convex portion 66A of the table 66 is inserted into the hole 38A of the apparatus main body 38 with a slight gap, the engagement between the gear 76 and the gear 62A is released when the load on the drive shaft 74 increases. There is no.
[0028]
While watching the spindle 18 rotating at low speed in this way, as shown in FIG. 2, the worker aligns the spindle 18 and the shaft 14 of the impeller below the motor 16. When the alignment is advanced and the rotation speed of the spindle 18 is to be increased, the operation pendant 80 is operated to swing the table 66 so that the gear 76 and the gear 62B are engaged. Thereby, the rotational speed of the rotating body 52, that is, the rotational speed of the spindle 18 can be increased.
[0029]
As described above, in the rotating device 10 of the present embodiment, the spindle 18 is rotated by the centering motors 72 and 72, so that the labor required for centering can be reduced.
In addition, since the spindle 18 and the drive shafts 74 and 74 are connected via the universal joint structure, it is not necessary to position and install the drive shafts 74 and 74, and the rotating device 10 can be installed in the upper portion of the motor 16 in a short time. Can be attached to. Further, since the rotating device 10 is operated by remote operation, that is, by the operation pendant 80, the exposure amount of the operator can be reduced.
[0030]
In addition, since the rotating device 10 of the present embodiment can change the rotational speed of the rotating body 52 by swinging the table 66, the spindle 18 and the impeller shaft 14 are efficiently aligned. be able to.
As shown in FIG. 2, the rotating device 10 may be provided with a rotor tachometer 82 to measure the rotational speed of the rotating body 52 and display the measurement result on the monitor 84. Thereby, the centering operation can be performed more safely.
[0031]
【The invention's effect】
As described above, the rotating device for centering according to the present invention can rotate the rotating shaft for centering without applying a large load to the rotating shaft, so that the centering operation is performed efficiently. be able to. In addition, since the rotating operation of the rotating shaft for centering is mechanized, it is possible to cope with work in a dangerous place.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram for explaining a reactor coolant recirculation system. FIG. 2 is a schematic configuration diagram of a recirculation pump and a motor. FIG. 3 is a side view of a rotating apparatus according to the present invention. ─A cross-sectional view [FIG. 5] BB cross-sectional view of FIG. 3 [FIG. 6] CC cross-sectional view of FIG. 3 [FIG. 7] Explanatory drawing explaining the connecting structure of the rotating body and the spindle [FIG. Explanatory drawing explaining the connection structure between the body and spindle 【Explanation of symbols】
DESCRIPTION OF SYMBOLS 10 ... Rotating device 12 ... Recirculation pump 14 ... Shaft 16 ... Motor 18 ... Spindle 36 ... Drive unit 38 ... Device main body 40 ... Connecting member 42 ... Fixing jig 48 ... Pin 50 ... Rod member 52 ... Rotating body 72 ... Centering motor 74 ... Drive shaft

Claims (4)

A rotating device for centering that is attached to one rotating shaft of a pair of rotating shafts that require centering for connection and rotates the rotating shaft,
The rotating device is
A connecting member attached to the other end of the end of the one rotating shaft and connected to the pair of rotating shafts ;
An apparatus main body rotatably supporting a rotating body engaged with the connecting member;
A drive unit having a rotation drive source for rotating the rotating body,
The end portion of the one rotating shaft and the connecting member are swingably connected via a pin disposed in a direction orthogonal to the one rotating shaft,
The connecting member and the rotating body are:
A rod member disposed in a direction orthogonal to the one rotating shaft and the pin and supported by the rotating body ;
Formed on the connecting member, and when the bar member is engaged , the bar member is connected via the one rotation shaft and a groove orthogonal to the pin, and rotates the rotating body. Thus, the connecting member rotates through the rod member engaged with the groove, and the rotating device for centering.   2. The drive unit includes an elevating device that elevates and lowers the rotary drive source, and the rotary drive source is connected to the rotating body by lowering the rotary drive source with the elevating device. The rotation apparatus for centering described in 1. The apparatus main body has two types of gears with different diameters meshed with the rotating body,
3. The rotating device for center alignment according to claim 1, wherein the drive unit is configured to select one of the two types of gears and connect the rotation drive source. 4.   The two rotation shafts are an impeller shaft of a recirculation pump that forcibly circulates coolant to the reactor, and a spindle of a rotational drive source that rotates the shaft of the impeller. 4. The rotating apparatus for centering according to any one of 3 above.

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