JP2809299B2 - Thin film heater type wind speed sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind speed measuring sensor inside a rotating device.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a perspective view of an anemometer generally used in the conventional wind speed measurement shown in Japanese Patent Publication No. 0, where 1 is a positive temperature coefficient thermistor, 2 is a thermocouple, 3, 4, 5, and 6 are lead wires, and 7 is a lead wire. It is a voltmeter.

Next, the operation will be described. In designing the thermal design of the equipment, it is necessary to grasp the thermo-fluid phenomenon (flow) inside the equipment. In particular, the measurement of the wind speed of each part of the equipment is an important matter. Here, an anemometer using a thermistor, which is one of the wind speed techniques, is shown. The conventional anemometer is configured as described above, and includes, for example, a heating element composed of a positive temperature coefficient thermistor 1 and a thermocouple 2 fixed on the surface of the positive temperature coefficient thermistor 1 with low melting point glass or ceramic. A voltage is applied via the leads 3 and 4 drawn from the thermistor 1, and a voltmeter 7 is connected to the leads 5 and 6 drawn from the thermocouple 2. Since the resistance of the positive temperature coefficient thermistor 1 changes remarkably at the Curie temperature, the temperature is kept almost constant irrespective of the power supply voltage, the temperature, the temperature, and the like. And the thermoelectromotive force of the thermocouple 2 decreases. When an experiment was performed using chromel-constantan as the thermocouple 2, data as shown in FIG. 13 was obtained, and within a certain range, there was a linear characteristic between the wind speed and the thermoelectromotive force. It was revealed. In addition,
When bonding thermocouple 2 and PTC thermistor 1,
By appropriately selecting the amount of the adhesive and the thermal conductivity of the adhesive, the amount of heat radiation can be changed, so that it can be used for light wind or strong wind.

[0004]

In the conventional wind speed measurement, when measuring inside the ventilation holes in the rotor of the rotating device, the positive characteristic thermistor 1 is blown in the centrifugal direction by centrifugal force due to rotation.
There was a problem of damage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can effectively measure a wind speed and prevent a wind speed sensor from being damaged by the high speed rotation of a rotor. The purpose is to:

[0006]

A thin-film heater type wind speed sensor according to the present invention is characterized in that a spider is provided so that a support pipe formed by attaching a thin-film heat source to which a thermocouple is attached is passed through an axial ventilation hole of a rotor. And the rotor is provided with a fixing portion at the tip of the support pipe.

Further, in the thin film heater type wind speed sensor according to the present invention, a support pipe formed by attaching a thin film heat source to which a thermocouple is connected is incorporated into a cartridge via a coating material, and the cartridge is placed between rotors. It is designed to be removable.

Further, in the thin film heater type wind speed sensor according to the present invention, a processing hole having a step portion is provided inside the processing bolt, and a thin film heat source is fitted into the processing hole by using the step portion with the attached support pipe. The bolts are mounted so that they fit together, and a working bolt is screwed onto a motor shaft near the clamper, for example.

[0009]

According to the thin-film heater type wind speed sensor of the present invention, when measuring the wind speed inside the ventilation hole in the rotor of the rotating device, a centrifugal force is applied in the radial direction by rotation, and the support pipe to which the wind speed sensor is attached is attached. Is fixed to the ventilation hole wall, and the position of the wind speed measurement sensor is fixed. In addition, a thin film heat source is attached to a support pipe, and the calorific value and the temperature difference between the surface of the thin film heat source and the wind to be measured are obtained from a characteristic curve diagram calibrated by another anemometer in advance to determine the wind speed of the sensor unit. .

In addition, a support pipe having a thermocouple attached to a thin-film heat source is incorporated into a cartridge via a coating material, and the cartridge is detachably mounted on a rotor, so that the wind speed sensor can be easily attached and detached. It can be performed reliably.

Further, by screwing a processing bolt attached to the stepped portion of the processing hole so as to lock the wind speed sensor in the radial direction to the motor shaft, the positioning and fixing of the wind speed sensor can be surely performed. Can be accurately measured.

[0012]

【Example】

Embodiment 1 FIG. Hereinafter, a heater type wind speed sensor according to a first embodiment of the present invention will be described with reference to the drawings. 1 is a side sectional view showing a state in which a heater type wind speed sensor according to the present invention is mounted on a motor, FIG. 2 is an enlarged perspective view showing the periphery of the wind speed sensor, FIG. 3 is an electric circuit diagram connected to a thin film heat source, and FIG. Is a connection diagram for measuring the temperature difference between the thin film heat source portion and the surrounding portion, and FIG. 5 is a characteristic curve diagram of the sensor measured by the wind speed measurement method. In the figure, 11 is a stator, 12 is a stator winding, 13 is a shrink ring, 14 is an end ring, 15 is a rotor,
16 is a rotor bar, 17 is a clamper, 18 is a spider, 19 is an axial ventilation hole provided in the spider, 20 is a thin film heater type wind speed sensor, 21 is a shaft, 22 is a connection route, and 23 is a thin film heater type wind speed sensor tip. Fixed part, 2
Reference numeral 4 denotes a thin film heater type wind speed sensor mounting portion insertion portion provided in a radial direction of the spider, and 25 denotes a mounting portion of the thin film heater type sensor 20. Reference numeral 26 denotes a thin film heat source, which is formed by attaching a thin resistance wire 26a to an insulating sheet 26b, for example, as shown in FIG. 27 is a copper foil and 28 is a support pipe, which has a diameter of 3 to 5 mm and is made small so as not to be affected by the wind speed. 29 is a thin film heat source temperature contact portion,
30 is a copper foil, 31 is an air temperature contact portion, 32 is a + side thermocouple, 33 is a − side thermocouple, 36 is a thermocouple insertion hole, 37 is a power supply, and 38 is a galvanometer. The copper foil 30 is not affected by wind, and is mounted in a direction perpendicular to the axis of the support pipe 28 to reduce resistance to wind. The thermocouples of the thin film heat source temperature contact portion 29 and the air temperature contact portion 31 are attached to copper foils 27 and 30 having good heat conductivity, and are attached to the support pipe 28 through thermocouple insertion holes 36.

Next, the operation will be described. A power source 37 is connected to the thin-film heat source 26 constituting the wind speed sensor as shown in FIG. 3 to apply heat. When the natural wind of the wind direction 39 hits the thin-film heat source 26, the thin-film heat source 26 is cooled, the temperature of the thin-film heat source 26 decreases, and the difference between the temperature of the thin-film heat source portion and the temperature of the air temperature contact portion 31 decreases. ing. The wind speed of the natural wind is measured using the strength of the natural wind and a change in the temperature difference (the temperature difference between the temperature of the thin film heat source and the air temperature contact portion 31). A specific method of measuring the temperature difference is measured by a circuit as shown in FIG. The structure of the thermocouple is (+), which is the contact point 29, 31 of the thin film heat source temperature section and the air temperature section, respectively.
(−) The two (thermocouples 32 and 33, 34 and 35) are connected, and the current flowing at that time is read by galvanometer 38, and temperature difference Δθ is obtained from the temperature characteristics of the thermocouple. As shown in FIG. 3, a certain amount of heat is applied to the thin-film heat source 26 by the power supply 37, the natural wind is arbitrarily changed, and other anemometers are calibrated in advance.
Is used to measure the wind speed. Here, the heat transfer coefficient α, that is, the amount of heat per unit area and per unit temperature is proportional to the flow rate v to the 0.8th power, where c is an experimental constant.
= Cv ^0.8 , so if the flow velocity becomes large,
The temperature difference between the thin film heat source part and the air temperature contact part is reduced, and FIG.
A characteristic curve diagram as shown in FIG. Therefore, by reading the value of the galvanometer, the wind speed is determined.

Next, the mounting operation of the wind speed sensor will be described. Wind speed sensor mounting part insertion part 24 inside rotor
A mounting portion 25 of the thin-film heater type wind speed sensor 20 is embedded therein, and the tip of the thin-film heater type wind speed sensor is installed in the thin-film heater type wind speed sensor tip fixing portion 23 so that the thin-film heater type wind speed sensor 20 passes through the ventilation hole 19. ing. A thermocouple having a thin film heat source temperature section 29 and an air temperature section 31 as contacts,
A connection line connecting the power source and the thin-film heat source is drawn from a connection route 22 through the inside of the rotor. With this configuration, the rotor rotates and receives a centrifugal force in the radial direction, and a force acts in the direction of the distal end of the support pipe 28. This force fixes the distal end of the support pipe 28 to the distal end of the thin film heater type wind speed sensor. The thin film heater type wind speed sensor 20
Is fixed, and the wind speed of the rotating rotor ventilation hole can be accurately measured.

Embodiment 2 FIG. In the first embodiment, the thin film heater type wind speed sensor tip fixing portion is formed in a rectangular parallelepiped shape as shown in FIG. 2, but as shown in FIG. May be.
Thereby, there is an advantage that it is easy to machine the thin-film heater type wind speed sensor tip fixing portion.

Embodiment 3 FIG. Third Embodiment A heater type wind speed sensor according to a third embodiment of the present invention will be described with reference to the drawings. In the first embodiment, the wind speed sensor is directly mounted in the ventilation hole 19 of the rotor 15 and fitted to the shaft 21. In the third embodiment, however, the wind speed sensor is installed in the rotor as shown in FIG. This is a structure in which the embedded cartridge 41 is fitted.
The wind sensor is coated 42 in the cartridge 41.
It is a structure that is hardened and fixed. FIG.
FIG. With the structure according to the third embodiment,
There is an advantage that the attachment and detachment of the wind speed sensor can be performed more easily and reliably than when the wind speed sensor is directly mounted in the ventilation hole 19.

Embodiment 4 FIG. Fourth Embodiment A heater type wind speed sensor according to a fourth embodiment of the present invention will be described with reference to the drawings. Example 1
In FIG. 3, the case where the wind speed sensor is installed in the ventilation hole 19 of the rotor is shown. However, as shown in FIG. 9, the fourth embodiment shows the case where the wind speed near the axis on the side of the clamper 17 is measured. In the figure, 43 is a specially machined bolt, 44 is a bolt hole, and 45 is a support attached to the wind speed sensor. FIG. 10 is an enlarged view showing the special machining bolt 43, and FIG.
Is an enlarged view showing a state in which a wind speed sensor is attached to a special processing bolt, 46 is a processing hole provided in the bolt 43 so that the wind speed sensor can be inserted, 47 is a step portion of the processing hole 46, and 48 is a bolt 43. Bolt 43 to tighten
Is a groove provided at the top of the.

Next, the operation will be described. When the shaft 21 rotates, the wind speed sensor support 45 hits the stepped portion 47 of the machined hole of the bolt 43 and receives the centrifugal force in the radial direction of the shaft 21 to fix the wind speed sensor. It can be measured accurately.

[0019]

According to the present invention, as described above, since the wind speed sensor also serves as a positioning support pipe, the position of the sensor is fixed by centrifugal force due to rotation, and a stable wind speed is measured. it can. Also, by attaching the thin film heat source to the support rod, a structure in which the sensor is not damaged by centrifugal force due to rotation can be obtained.

Further, by mounting a support pipe having a thermocouple attached to a thin-film heat source into a cartridge through a coating material and detachably mounting the cartridge on a rotor, the wind speed sensor can be easily attached and detached. It can be performed reliably.

Further, by screwing a processing bolt formed by engaging a wind speed sensor into a processing hole having a stepped portion, for example, in the vicinity of a clamper on the motor shaft, the positioning and fixing of the wind speed sensor is ensured. The nearby wind speed can be measured accurately.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a state where a thin-film heater type wind speed measuring sensor according to Embodiment 1 of the present invention is attached to a motor.

FIG. 2 is an enlarged perspective view showing the vicinity of a thin-film heater type wind speed measurement sensor according to Embodiment 1 of the present invention.

FIG. 3 is an electric circuit diagram connected to a thin film heat source in the thin film heater type wind speed measuring sensor according to the first embodiment of the present invention.

FIG. 4 is a connection diagram for measuring a temperature difference between a thin film heat source portion and a peripheral portion in the thin film heater type wind speed measuring sensor according to the first embodiment of the present invention.

FIG. 5 is a characteristic curve diagram of a sensor measured by a thin-film heater type wind speed measuring sensor according to the first embodiment of the present invention.

FIG. 6 is an enlarged perspective view showing the vicinity of a thin-film heater type wind speed measurement sensor according to Embodiment 2 of the present invention.

FIG. 7 is a side sectional view showing a state where a thin film heater type wind speed measuring sensor according to Embodiment 3 of the present invention is mounted on a motor.

FIG. 8 is a front sectional view showing a cartridge according to a third embodiment of the present invention.

FIG. 9 is a side sectional view showing a state in which a thin-film heater type wind speed measuring sensor according to Embodiment 4 of the present invention is attached to a motor.

FIG. 10 is an enlarged view showing a specially machined bolt according to Embodiment 4 of the present invention.

FIG. 11 is an enlarged view showing a state where a wind speed sensor is attached to a specially machined bolt according to Embodiment 4 of the present invention.

FIG. 12 is a perspective view showing a conventional anemometer.

FIG. 13 is a characteristic diagram of a conventional sensor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Stator 15 Rotor 17 Clamper 18 Spider 19 Ventilation hole 20 Thin film heater type wind speed sensor 21 Axis 22 Connection route 23, 40 Thin film heater type wind speed measurement sensor tip fixing portion 24 Wind speed sensor mounting portion insertion portion 26 Thin film heat source 27, 30 Copper foil 28 Support pipe 29 Thin film heat source temperature contact part 31 Air temperature contact part 32, 34 + side thermocouple 33, 35 − side thermocouple 36 Thermocouple insertion hole 37 Power supply 38 Galvanometer 41 Cartridge 42 Coating material 43 Special Machining bolt 46 Machining hole 47 Step

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01P 5/12 H02K 11/00

Claims (3)

(57) [Claims] 1. A thin-film heat source to which a thermocouple is connected is mounted on a support pipe, and the support pipe is inserted into a radial insertion portion provided in a part of a rotor of a rotating device. A thin-film heater type wind speed sensor, wherein the wind speed sensor is installed so as to penetrate through the ventilation holes provided in the axial direction, and the rotor has a fixed portion at the tip of the support pipe. 2. A thin-film thermal power source connected to a thermocouple is attached to a support pipe, and the support pipe is assembled into a cartridge via a coating material. A thin-film heater-type wind speed sensor, which is detachably mounted on a rotor so as to penetrate the hole. 3. A processing bolt provided with a processing hole having a stepped portion therein, and a support pipe of a thin film heat source to which a thermocouple is connected is fitted into the processing hole of the processing bolt. A thin-film heater type wind speed sensor, wherein the machining bolt is screwed onto a motor shaft.