JPH09196530A - Cooling device for rotation signal detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device for a rotation signal detector, which has a high cooling efficiency and can prevent the rotation signal detector from being damaged by heat caused by a raise in temperature. SOLUTION: A cooling device to cool a specified rotation signal detector 100 includes a specified casing 5 to accommodate a sensor of the rotation signal detector 100, refrigerant inlet and outlet pipes 8 and 9 connected to the casing 5, a pump 11 to send the refrigerant under pressure to cool the rotation signal detector 100, a controller 10 and 14 to control the flow rate of the refrigerant discharged from the pump 11 based on the temperature of the refrigerant flowing out of the rotation signal detector 100, and a cooler 12 to cool down the refrigerant flowing out of the pump 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a rotation signal detector which measures the vibrations of rotary blades of various turbines, pumps, fans, etc. in a non-contact manner.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing the structure of a conventional rotation signal detector. As described above, the rotation signal detector is a device that generally measures the vibration of rotating blades of various turbines, pumps, fans, etc. in a non-contact manner. A large number of electromagnetic rotation signal detectors are used, which have the advantages that their structure is simple and compact, they do not require a power supply, and they do not require maintenance.

The electromagnetic rotation signal detector shown in FIG. 5 is equipped with a permanent magnet 2, a yoke 1 and a detection coil 3 in a casing 5, and the rotation signal is transmitted from the detection coil 3 to the outside via a signal line 4. Is output. In addition, the cooling pipe 1 which is the cooling unit
The casing 5 of the rotation signal detector is housed in the casing 9, and the casing 5 is made by the water flowing in the cooling pipe 19.
Is cooling around.

As described above, in the electromagnetic rotation signal detector composed of the permanent magnet 2, the detection coil 3 and the yoke 1, when the magnetic body approaches the yoke 1, it passes through the detection coil 3 around the yoke 1. The magnetic flux changes, and an induced voltage having a frequency proportional to the change is generated in the detection coil 3. The magnetic flux pulsates in proportion to the frequency (f = rotation speed / 60 Hz), and this is output as a rotation signal to the outside via the signal line 4.

[0005]

Since the conventional electromagnetic rotation signal detector as described above is a detector for measuring the vibration frequency of the rotor blade of a turbine or the like in a non-contact manner, it is used at a high temperature. . Generally, the rotation signal detector needs to be sufficiently cooled because the performance of the permanent magnet 2 and the detection coil 3 is deteriorated as the temperature rises and the reliability of data tends to be deteriorated. Therefore, in order to prevent damage to the detector due to heat associated with temperature rise, cooling with water as described above is performed. However, since cooling is performed from the outside of the casing 5 as described above, there is a drawback that the cooling efficiency is low. An object of the present invention is to provide a cooling device for a rotation signal detector, which prevents damage to the rotation signal detector due to heat accompanying temperature rise and has high cooling efficiency.

[0006]

In order to solve the above problems and achieve the object, a cooling device for a rotation signal detector of the present invention is configured as follows. The cooling device for a rotation signal detector of the present invention is a cooling device for a rotation signal detector for cooling a predetermined rotation signal detector, wherein a sensor portion of the rotation signal detector is housed in a predetermined casing, and the casing is With an inlet pipe and an outlet pipe for the refrigerant, a pump for pumping the refrigerant to cool the rotation signal detector, and measuring the temperature of the refrigerant exiting the rotation signal detector,
Control means for controlling the flow rate of the refrigerant flowing out of the pump based on the temperature and cooling means for cooling the refrigerant flowing out of the pump are provided.

As a result of taking the above-mentioned means, the following actions occur. According to the rotation signal detector cooling device of the present invention,
The temperature of the refrigerant discharged from the rotation signal detector is measured, the flow rate of the refrigerant discharged from the pump is controlled based on the temperature, and the refrigerant discharged from the pump is cooled. That is, by partially projecting the rotation signal detector into the steam turbine casing through which high-temperature steam passes, a cooling structure using a refrigerant for suppressing a temperature rise that occurs can be formed.

As a result, the refrigerant discharged from the pump enters the rotation signal detector and is discharged after cooling the yoke, the permanent magnet, the detection coil, etc. further,
The outlet temperature of the pump of the refrigerant is measured, the flow rate of the pump outlet is controlled by the control unit, and the refrigerant output from the rotation signal detector is cooled by the cooling unit.

Therefore, damage to the rotation signal detector due to heat can be prevented, and by monitoring the temperature of the refrigerant at the detector outlet, the yoke, the permanent magnet, and the detection associated with the temperature increase in the detector can be detected. There is no deterioration in the performance of the coil,
The reliability of the data detected by the detector can be maintained. Further, it can be applied to a blade vibration monitoring device when the steam turbine is actually operated.

[0010]

1 is a sectional view showing the structure of a cooling type rotation signal detector according to an embodiment of the present invention.
The rotation signal detector 100 shown in FIG. 1 is a cooling type structure of the conventional rotation signal detector as described above. Then, a sensor portion including the yoke 1, the permanent magnet 2, the detection coil 3, and the signal line 4 is housed in the casing 5. Further, as shown in FIG. 1, a cooling structure including a stainless steel partition plate (for cooling) 6, an O-ring 7, a refrigerant inlet pipe 8 and a refrigerant outlet pipe 9 is formed.

Refrigerant enters through the refrigerant inlet pipe 8 and the yoke 1,
After cooling the permanent magnet 2 and the detection coil 3, they exit from the refrigerant outlet pipe 9. At this time, the tip of the yoke 1 is protected and sealed by the stainless partition plate 6. Further, an O-ring 7 is provided between the permanent magnet 2 and the casing 5 so that the refrigerant does not get wet.
Sealed with.

FIG. 2 is a block diagram showing the configuration of the cooling device according to the embodiment of the present invention. This cooling device includes a pump 11, a cooler 12, and a controller 10. The outlet of the pump 11 is connected to the inlet of the cooler 12, and the outlet of the cooler 12 is connected to the inlet of the pump 11. Further, the controller 10 controls the outlet flow rate of the pump 11.

FIG. 3 is a diagram showing a configuration in which the rotation signal detector shown in FIG. 1 and the cooling device shown in FIG. 2 are applied to a blade vibration monitoring device when a steam turbine is actually operating. In FIG. 3, reference numeral 18 denotes a turbine casing, and the rotation signal detector 100 described above is mounted on the circumference of the turbine casing 18. The turbine casing 18 is provided with a rotor 16 and a rotor 17 for measuring the blade vibration frequency. Further, an annular refrigerant pipe 15 is attached to the refrigerant inlet pipe 8 and the refrigerant outlet pipe 9 of the rotation signal detector 100. Through the refrigerant pipe 15, the refrigerant is supplied to the tank 13, the pump 11,
The cooler 12 and the rotation signal detector 100 are circulated.

A thermometer 14 is attached near the refrigerant outlet pipe 9 of the rotation signal detector 100. The controller 10 adjusts the temperature by controlling the flow rate of the pump 11 while monitoring the temperature of the outlet refrigerant measured by the thermometer 14.

FIG. 4 is a plot diagram of controller specifications for the pump of the cooling device described above. In the plot diagram shown in FIG. 4, the horizontal axis represents the outlet temperature of the refrigerant outlet pipe 9, and the vertical axis represents the rotation speed of the pump 11. As shown in FIG. 4, the controller 10 keeps the rotation speed of the pump 11 at a constant value until the outlet temperature of the refrigerant outlet pipe 9 reaches T1 ° C. Then, when the outlet temperature of the refrigerant outlet pipe 9 becomes T1 ° C. or higher, the controller 10 increases the rotation speed of the pump 11. As a result, the flow rate of the refrigerant in the refrigerant pipe 15 increases, and the temperature rise in the rotation signal detector 100 is suppressed.

The present invention is not limited to the above-mentioned embodiment, and can be carried out by appropriately modifying it without changing the scope of the invention. (Summary of Embodiment) The configuration, operation and effect shown in the embodiment are summarized as follows. The cooling device for a rotation signal detector described in the embodiment is a cooling device for a rotation signal detector that cools a predetermined rotation signal detector 100, and the sensor portion of the rotation signal detector 100 has a predetermined casing 5. A pump 11 for supplying a refrigerant to cool the rotation signal detector 100, and a refrigerant discharged from the rotation signal detector 100, which are accommodated in the casing 5 and are provided with a refrigerant inlet pipe 8 and a refrigerant outlet pipe 9. The control means (10, 14) for controlling the flow rate of the refrigerant discharged from the pump 11 on the basis of the measured temperature, and the cooling means (12) for cooling the refrigerant discharged from the pump 11.

As described above, in the cooling device for the rotation signal detector, the temperature of the refrigerant discharged from the rotation signal detector 100 is measured, the flow rate of the refrigerant discharged from the pump 11 is controlled based on the temperature, and The refrigerant discharged from the pump 11 is cooled. That is, by partially mounting the rotation signal detector 100 in the steam turbine casing through which high-temperature steam passes, a cooling structure using a refrigerant for suppressing a temperature rise that occurs can be formed.

As a result, the refrigerant discharged from the pump 11 enters the rotation signal detector 100, cools the yoke 1, the permanent magnet 2, the detection coil 3, etc., and is then discharged. Furthermore, the outlet temperature of the pump 11 of the refrigerant is measured, and the pump 11 is controlled by the control means (10, 14).
The rotation signal detector 1 is controlled while controlling the flow rate at the outlet.
The cooling medium (00) is cooled by the cooling means (12).

Therefore, the rotation signal detector 10 based on heat is used.
0 can be prevented from being damaged, and the temperature of the refrigerant at the outlet of the detector 100 is monitored, so that the yoke 1, the permanent magnet 2, and the detection coil 3 associated with the temperature rise in the detector 100 can be prevented.
As a result, the reliability of the data detected by the detector 100 can be maintained. Further, it can be applied to a blade vibration monitoring device when the steam turbine is actually operated.

[0020]

According to the present invention, it is possible to prevent the rotation signal detector from being damaged by heat associated with temperature rise and provide a cooling device for a rotation signal detector having high cooling efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a cooling type rotation signal detector according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of the cooling device according to the embodiment of the present invention.

FIG. 3 is a diagram showing a configuration in which the rotation signal detector and the cooling device according to the embodiment of the present invention are applied to a blade vibration monitoring device when a steam turbine is actually operating.

FIG. 4 is a plot diagram of controller specifications for a pump of the cooling device according to the exemplary embodiment of the present invention.

FIG. 5 is a cross-sectional view showing the configuration of a conventional electromagnetic rotation signal detector.

[Explanation of symbols]

 100 ... Rotation signal detector 1 ... Yoke 2 ... Permanent magnet 3 ... Detection coil 4 ... Signal line 5 ... Casing 6 ... Stainless partition plate 7 ... O-ring 8 ... Refrigerant inlet pipe 9 ... Refrigerant outlet pipe 10 ... Controller 11 ... Pump 12 ... Cooler 13 ... Tank 14 ... Thermometer 15 ... Refrigerant piping 16 ... Rotor blade 17 ... Rotor 18 ... Turbine casing 19 ... Cooling tube

Claims (1)

[Claims] 1. A cooling device of a rotation signal detector for cooling a predetermined rotation signal detector, wherein a sensor portion of the rotation signal detector is housed in a predetermined casing, and an inlet pipe and an outlet of a refrigerant are provided in the casing. A pipe is provided, and a pump that pumps refrigerant to cool the rotation signal detector, and the temperature of the refrigerant that comes out of the rotation signal detector are measured, and the flow rate of the refrigerant that comes out of the pump is controlled based on that temperature. And a cooling means for cooling the refrigerant discharged from the pump.