JPS6132358Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a dry bulb wet bulb temperature transmitter (hereinafter referred to as a transmitter) for measuring temperature and humidity.

Conventional transmitters of this type have two sensors, such as platinum resistance temperature detectors, one of which is a dry bulb, and the other is wrapped with gauze and supplied with water to form a wet bulb. Temperature and humidity were measured by constantly blowing air with a ventilation motor and measuring dry bulb and wet bulb temperatures. For this reason, a motor mounting part and a sensor mounting part are required.
Whether the two were integrally constructed or separable, they were made of the same type of material. However, ventilation motors inevitably generate heat, so if they are made of metal, the heat dissipates well, but the heat is transmitted to the sensor, causing measurement errors.If the motor is made of resin, heat is not easily transmitted, but heat dissipates poorly, so the heat dissipates easily. This had the disadvantage that it would cause the temperature of the sensor to rise, resulting in measurement errors. For this reason, it would be possible to separate the motor mounting part and the sensor mounting part, but this would increase the size of the entire transmitter, making it inconvenient to handle.

In view of the above points, the purpose of this invention was to make the motor mounting part made of metal with good thermal conductivity and the sensor mounting part made of resin with poor thermal conductivity to eliminate the effects of heat generated by the motor. An object of the present invention is to provide a wet and dry bulb temperature transmitter.

FIG. 1 is a partially cutaway side view showing an embodiment of this invention, and FIG. 2 is a partially cutaway front view. In the figure, 1 is a metal motor cover with an exhaust port 11 at the top, 2 is a metal motor with a hole 21 in the center, a ventilation motor 3 is attached to the top, and is fixed to the motor cover 1 with screws or the like. The motor cover 1 and the motor mounting plate 2 constitute a motor mounting part, and both are made of metal such as die-cast aluminum with good thermal conductivity. 4 is a resin mount provided at the bottom of the motor mounting part, and a resin sensor holding part 5
is attached, and an intake port 41 is installed in the front part.
is provided. A sensor 61 for measuring a dry bulb temperature and a temperature sensor 62 for measuring a wet bulb temperature are attached to the sensor holding part 5, which are made of a rod-shaped platinum resistance thermometer extending in the horizontal direction. The pedestal 4 and the sensor holding part 5 constitute a sensor mounting part, and both are made of resin with poor thermal conductivity. A water tank 7 made of resin is provided at the bottom of the sensor holding part, and one end of gauze 9 wrapped around the wet bulb temperature measurement sensor 62 is immersed in water 8 in the water tank 7.
The wet bulb temperature measurement sensor 62 is always wet with water.

In this state, rotate the ventilation motor 3,
The air intake port 41 at the front of the frame 4, the motor mounting plate 2
Ventilation is carried out through the hole 21, the ventilation motor 3, and the exhaust port 11 of the motor cover, and the wet and dry bulb temperature is measured by the dry bulb temperature measurement sensor 61 and the wet bulb temperature measurement sensor 62, and a measurement signal is transmitted to the outside. It's becoming like that. At this time, the ventilation motor 3 generates heat, but most of the heat is absorbed by the motor cover 1 and motor mounting plate 2, which are made of metal with good heat conduction and which are the motor mounting parts, and is radiated to the outside. Since the contact area with the pedestal 4 is small and the sensor holding part 5 is also made of resin with poor thermal conductivity, the influence of heat generated by the motor on the sensors 61 and 62 is extremely small.

As described above, this invention is a dry-bulb/wet-bulb temperature transmitter in which the motor mounting part is made of metal with good heat conduction, and the sensor mounting part is made of resin with poor heat conduction.

Therefore, most of the heat generated by the motor is absorbed by the motor mounting part and radiated to the outside, and there is almost no conduction of heat to the sensor mounting part, so the sensor accurately measures the ambient temperature without being affected by the heat generated by the motor. This makes it an extremely reliable transmitter.
Furthermore, accurate measurements can be made even with a structure in which the motor mounting part and the sensor mounting part are brought close to each other, so that miniaturization is possible.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an embodiment of this invention, and FIG. 2 is a partially cutaway front view. 1...Motor cover, 2...Motor mounting plate, 3
... Ventilation motor, 4... Frame, 5... Sensor holding section, 61, 62... Dry bulb wet bulb temperature measurement sensor, 7... Water tank.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) A metal motor cover with good thermal conductivity that has an exhaust port at the top, and a motor that is fixed to the bottom of this motor cover and has a hole in the center for ventilation at the top. (b) A resin mount with poor thermal conductivity that is provided at the bottom of the motor mount and has an air intake in the front, and is attached to the mount. a sensor holding part made of resin, and a sensor mounting part including a dry-bulb temperature measurement sensor and a wet-bulb temperature measurement sensor, which are provided on the sensor holding part and are made of a platinum resistance thermometer or the like and extend in the horizontal direction; (c) A dry-bulb wet-bulb temperature transmitter characterized by comprising a water tank provided at the lower part of the sensor mounting part, in which one end of gauze wrapped around the wet-bulb temperature measurement sensor is immersed.