JPH0342343Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a thermometer that accurately measures the temperature of the atmosphere, and is used to collect temperature data for weather observation.

(Prior art) When measuring the temperature of the atmosphere, for example, a thermometer for weather observation can be explained based on FIG. 1 shown as an embodiment of this invention. A cover 6 is provided to fix the part 3 so that it is not affected by direct sunlight or direct wind, and to prevent rainwater from entering above. Shape only) 7 is attached to suck the atmosphere from the bottom of the cylinder 1 and exhaust it from the top. The ventilation speed in the cylinder 1 is preferably 5 m to 6 m per second, depending on meteorological observation methods, and the rotation speed of the fan 7 is set accordingly. Therefore, it is possible to suppress disturbances in the circulation of the atmosphere inside the tube 1 due to the influence of the wind outside the tube 1, so accurate temperature measurements can be made, and observation data can be collected using this measurement method as a standard. There is.

(Problem that the invention attempts to solve) However, since such weather observation thermometers are installed outdoors and constantly collect temperature data 24 hours a day, the fan 7 attached to the tube 1 is also I had to keep it spinning. Therefore, if a failure occurs in fan 7, cylinder 1
The airflow rate within the system is not constant, resulting in the collection of unreliable temperature data.

In reality, unless you regularly inspect Fan 7,
Even if temperature data is tracked, it is difficult to discover the point of failure, and if discovery is delayed, incorrect measurements will occur for a long time. Furthermore, if the time of failure cannot be confirmed, temperature data over a long period of time before and after the failure cannot be used, which poses a major problem in meteorological observation.

Therefore, the object of this invention is to detect fan failures at an early stage, eliminate erroneous measurements, clarify the point of failure, and eliminate missing periods.

(Means for solving the problem) The gist of this invention is to provide a temperature-sensing part of a thermometer inside the cylinder, and to fix a fan to the cylinder to provide air flow inside the cylinder. The weather observation thermometer is provided with a rotation detection means for detecting the rotation of the fan, and an abnormality signal oscillator for determining rotation abnormality from a detection signal of the rotation detection means.

(Function) Therefore, the abnormality signal oscillator determines rotation abnormality and oscillates from the detection signal generated from the rotation detection means provided in the weather observation thermometer.
It is now possible to know the rotation status of the fan at all times,
Failures can be detected easily and early, and the above object can therefore be achieved.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

In FIGS. 1 to 4, a tube 1 is vertically attached to a column (not shown) via a bracket 2. As shown in FIG. This cylinder 1 is open at the top and bottom, and has a cover 6 for protecting against rainwater at the top end, and a temperature-sensing part 3 of a thermometer arranged inside the cover 6. In order to reduce the influence of sunlight on the temperature sensing part 3 of this thermometer, a heat insulating material 4 is attached directly to the inside of the tube 1, and a guide tube 5 is provided inside the tube 1 in consideration of air flow. It is being

A fan 7 is provided inside the cylinder 1 above the temperature sensing part 3 of the thermometer. This fan 7
For example, the fan body 8 has four blades 8a.
It is a thin fan consisting of a motor 9 directly connected to the fan body 8, and a frame 14. The fan 7 includes a rotation detecting means 1 as described below.
0 is set.

The rotation detection means 10 consists of a photointerrupter 11 and a reflector 12, and the photointerrupter 11 is attached to the tip of an arm 13 extending from one corner of the frame 14 toward the center of the fan body 8. This photo interrupter 11 is connected to the fan body 8
A reflective material 12 is pasted on the surface of the fan body 8, and each time the fan body 8 rotates, the photointerrupter 1
It is made to pass directly under 1 once. A pulse, which is a detection signal obtained by this rotation detection means 10, is sent to an abnormality signal oscillator 15.

The abnormal signal oscillator 15 consists of an amplifier 16, a timer 17, and an alarm circuit 18, and the rotation detection means 1
The pulse sent from 0 is amplified by an amplifier 16, and then sent to a timer 17 that constantly monitors the period of the pulse. This timer 17 is, for example, initialized at the time of startup and accumulates time from zero.The timer 17 is held for about 5 seconds, and after 5 seconds, the timer 17 goes down and the alarm circuit 18 is activated. It's getting old. Alarm circuit 1
8 is a device that does not activate a contact and issue an abnormal signal when the timer 17 falls;
This abnormality signal can be used to notify an abnormality by, for example, lighting a lamp, sounding a buzzer, or displaying it on recording paper.

In the above configuration, for example, the motor 9 is
When rotated at 1000 revolutions, the pulse signal obtained from the rotation detection means 10 has a period t ₁ of 0.06 seconds. If fan 7 is rotating normally, timer 17 is
It will be initialized every 0.06 seconds and will operate intermittently. And if Fan 7 stops due to a malfunction,
The timer 17 adds up the time, and when it reaches 5 seconds, the timer 17 goes off to notify you of an abnormality.

Incidentally, the timer 17 may also be configured to count the number of pulses per unit time, and activate the alarm circuit 18 when the number of pulses falls below a reference number of pulses.

5 and 6, another embodiment of this invention is shown, and the only difference from the previous embodiment is the rotation detecting means 10. In FIG. Since the other parts are the same as those in the previous embodiment, the same parts are given the same numbers and the explanation will be omitted.

The rotation detection means 10 is a frame 14 of the fan 7.
A light emitting element 21 is attached to one of the tips of a pair of arms 20a and 20b that protrude to sandwich the blade 8a.
A, a light receiving element 21b is attached to the other side, and a pulse is generated each time the blade 8a passes between them.

In this configuration, as in the previous embodiment, the
If the fan main body 8 is rotated at 1000 revolutions, an intermittent pulse with a period one-fourth of that of the above embodiment can be obtained.

Note that the rotation detection means 10 is not limited to the above two embodiments, and may also utilize a Hall element or a magnetic proximity switch.

(Effects of the invention) As described above, according to this invention, a weather observation thermometer is provided with a rotation detection means for a fan that provides air flow, and an abnormality signal is generated for determining rotation abnormality from an electric signal obtained from the fan rotation detection means. Since we installed an oscillator,
It becomes possible to know the rotational state of the fan at all times.
Therefore, it is possible to easily detect the failure point at an early stage, so that erroneous measurements can be prevented and missing periods can be eliminated, and reliable temperature data can be reliably collected.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a first embodiment of this invention, Figs. 2 and 3 show a fan used in the same, Fig. 2 is a plan view, Fig. 3 is a side view, and Fig. 4 is a side view. is an explanatory diagram showing the operating principle of the rotation detecting means and the abnormal signal oscillator in the above fan;
The figures and FIG. 6 show a fan as another embodiment, with FIG. 5 being a plan view and FIG. 6 being a side view. 1...tube, 3...temperature sensing part of thermometer, 7...fan, 8...fan body, 8a...blade, 10...
Rotation detection means, 11... Photo interrupter, 12
...Reflecting object, 15... Abnormal signal oscillator, 21a...
...Light emitting element, 21b... Light receiving element.

Claims (1)

[Claims for Utility Model Registration] 1. A weather observation thermometer in which a temperature-sensing part of the thermometer is provided in a cylinder, and a fan is fixed to the cylinder to provide air flow into the cylinder, the rotation of the fan being controlled by the rotation of the fan. 1. A weather observation thermometer comprising a rotation detecting means for detecting rotation, and an abnormality signal oscillator for determining rotation abnormality from a detection signal of the rotation detecting means. 2. The weather observation thermometer according to claim 1, wherein the rotation detection means comprises a photointerrupter attached to the surface of the fan body and a reflector attached to the fan body. 3. The weather observation thermometer according to claim 1, wherein the rotation detection means is comprised of a pair of light emitting element and light receiving element mounted across the blade of the fan.