JPH0543768U - Rotating electric machine - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent malfunction of the leak detector due to the inflow of the condensed liquid of water in the cooling air condensed by the water-cooled heat exchanger. [Structure] A drain port 6 for discharging a condensate is provided on a lower side surface of an overflow pipe 5 provided in a container 7 of a water leak detector 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fully-closed air-cooled rotary electric machine that is cooled by a water-cooled heat exchanger equipped with a leak detector.

[0002]

[Prior Art]

 In FIG. 3 showing an example of a conventional synchronous motor of a totally closed air cooler type, a top hat type unit cooler 11 is placed on the upper part of the main body 15 of the synchronous motor, and the left and right bearings 16 of the main body 15 are mounted on the left and right bearings 16. The rotor shaft 17 penetrates.

Of these, a blower 14 is attached to the left and right ends of the unit cooler 11, a cooler 12 is attached to the lower front part of the unit cooler 11, and water supply joints 18 A are attached to the left and right ends of the cooler 12. And drainage joints 18B are attached respectively. The upper end of the pipe 9 is connected to the lower center of the cooler 12, and the water leak detector 13 described in detail in the enlarged vertical sectional view of FIG. 4 is attached to the lower end of the pipe 9.

In FIG. 4, a guide rod 8 of a float switch 4 is vertically installed at the right end of the upper lid 7 a of the container 7 of the water leak detector 13, and the float switch 4 is vertically moved on the guide rod 8. It is installed freely. The overflow pipe 5 is vertically welded to the left side of the bottom of the container 7, and a joint (not shown) is connected to the lower end of the overflow pipe 5, and a drain pipe (not shown) is connected to the joint. The contact point (not shown) of the float switch 4 is connected to an alarm circuit of a monitoring board (not shown).

In the synchronous motor configured as described above, during operation, the cooling air inside the main body 15 is circulated by the blower 14 of the unit cooler 11, and the water cooling heat exchange (not shown) inside the unit cooler 11 is performed. It is cooled in a container. Then, when the cooling water leaks due to electrolysis in the pipe corroded by the cooling water supplied from the joint 18A to the water-cooling heat exchanger due to the operation over a long period of time and the cooling water leaks, the leak detector 13 The float switch 4 is levitated, and an alarm device on the monitoring panel notifies maintenance personnel to prevent the accident from spreading.

[0006]

[Problems to be solved by the device]

However, in the synchronous motor configured as described above, the water leak detector 13 not only operates due to the abrupt rise of the water level inside the container 7 due to the water leak described above, but also when the water leak detector 13 is started in the rainy season, for example. The water contained in the internal cooling air may condense on the surface of the piping of the water-cooled heat exchanger and the condensed water dropped may reach 200 to 300 ^CC / day. As a result, the water level in the container 7 rises. , The float switch 4 may malfunction. Then, the objective of this invention is to obtain the rotary electric machine which can prevent the malfunction of the float switch by condensed water.

[0007]

[Means and Actions for Solving the Problems]

 The present invention relates to a rotary electric machine in which cooling air is cooled by a water-cooling heat exchanger, and a water leakage detector that detects water leakage of the water-cooling heat exchanger by a float switch is built-in. This rotary electric machine prevents the malfunction of the float switch by preventing the rise of the water level of the container of the float switch into which the condensate flows, by providing a drain port for the condensate condensed by the cold heat exchanger.

[0008]

【Example】

 An embodiment of the rotating electric machine of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a water leakage detector 3 which is a main part of the rotating electric machine of the present invention, and is a view corresponding to FIG. 4 showing a conventional technique, and the same parts as those in FIG. It is attached. In FIG. 1, a drain port 6 having a cross-sectional area, which will be described later, is provided in advance at the position of the upper surface of the bottom plate 7b on the outer periphery of the overflow pipe 5 vertically extending to the left of the bottom plate 7b of the container 7.

In the rotating electric machine configured as described above, the cross-sectional area of the drainage port 6 is determined by the internal volume determined by the type and rating of the rotating electric machine, the maximum humidity of the place where the rotating electric machine is installed, and the cooling water. Since the condensed water that has flowed into the container 7 can be discharged from the drain port 6 as determined by the temperature and other factors together with the volume of the container 7, as shown by the arrow 10 in FIG. 2, malfunction of the float switch 4 due to condensed water is prevented. Not only is it possible to detect water leaks from the water-cooled heat exchanger, but the water level can be raised in the same way as in the past, so it can be detected in the same manner as in the past. Therefore, it becomes a rotating electric machine capable of distinguishing between water leakage and dew condensation, and it is possible to save unnecessary maintenance personnel.

In the above embodiment, the description has been given to the case of the synchronous motor having the top hat type unit cooler attached, but the invention can be applied to any of the electric motor and the generator, and it is not the synchronous machine. The same can be applied to the induction machine as long as it is a rotary electric machine using a water-cooled heat exchanger.

[0011]

[Effect of the device]

 As described above, according to the present invention, in the rotary electric machine in which the cooling air is cooled by the water-cooling heat exchanger and the leakage detector for detecting the leakage of the water-cooling heat exchanger is detected by the float switch, the overflow pipe of the leakage detector is detected. By providing a drain on the condensate condensed by the water-cooled heat exchanger on the side wall, the rise of the water level in the container of the float switch into which the condensate has flowed can be prevented, so malfunction of the float switch can be prevented. Can be obtained.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view showing an embodiment of a rotating electric machine of the present invention.

FIG. 2 is a partial vertical sectional view showing the operation of the rotating electric machine of the present invention.

FIG. 3 is a front view showing an example of a rotating electric machine to which a conventional water leak detector is attached.

FIG. 4 is a vertical cross-sectional view of a water leakage detector attached to a conventional rotating electric machine.

[Explanation of symbols]

1 ... Unit cooler, 3 ... Leakage detector, 4 ... Float switch, 5 ... Overflow pipe, 6 ... Drainage port, 7 ... Container.

Claims (1)

[Scope of utility model registration request] 1. A rotary electric machine in which cooling water is cooled by a water-cooling heat exchanger and a water leakage detector for detecting water leakage of the water-cooling heat exchanger by a float switch is built in, a sidewall of an overflow pipe of the water leakage detector. A rotating electric machine, characterized in that a drainage port for condensate condensed by the water-cooled heat exchanger is provided in the.