JPS5886842A - Preventive device for dew condensation of totally-enclosed apparatus - Google Patents

Abstract

PURPOSE:To prevent the dew condensation of each section in the totally-enclosed apparatus incorporating a heating element, and to obviate rusting by forming a dew-condensation water reservoir to the mounting section of a heat pipe set up to the bottom of the frame of the totally-senclosed apparatus. CONSTITUTION:The heat pipe 12 is set up to the bottom of the frame 4 of the totally-enclosed apparatus, the inside thereof has the heating elements of a coil, a stator core and a rotor core and is interrupted from the outside air by the frame 4, a bracket, a bearing and a shaft, and an indentation 13 forming the dew-condensation water reservoir is shaped to the mounting section of the heat pipe 12. A drip trap 14 for discharging dew-condensation water received in the indentation to the outside is formed. Consequently, since the temperature drop of the heat pipe 12 extremely affected by the temperature of the outside air is faster than other sections in the apparatus, dew condenses on the heat pipe, and dew is difficult to condense to other sections in the apparatus. Accordingly, a heater 11 for preventing dew condensation need not be mounted separately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dew condensation prevention bag aiK for a completely enclosed device containing a built-in heating element.

First, a conventional condensation prevention device of this type will be explained using an example of a fan-shaped electric motor shown in FIG. That is, Fig. 1 shows a cross-sectional side view of a fully open external sector electric motor. (ON state) generates heat. (4) is the frame, (5), (7) is the platen) (6) (8) is the bearing, and (9) is the shaft. These parts include the coil (1), stator core (2), By shielding the rotor core (3) from the outside air, the rotor core (3) is completely closed. cm is the above heating element (1) to (8)
(b) is a heater built into the fully closed aircraft.

In such a device, the coil (1) is insulated by taping and face treatment of the electric wire, but the main problem is insulation deterioration and decrease in insulation resistance due to moisture adhesion, so a heater αQ is installed. There is.

In other words, this heater QQ is energized when the motor power is 01 PIF (when stopped), and functions to keep the temperature inside the machine housing the coil (1) slightly higher than the outside temperature when the motor is stopped. ing.

By the way, the disadvantages of this conventional dew condensation prevention device are that it uses a heater, so a power source for the heater is required;
The need for space inside the aircraft to store the heater;
Furthermore, due to the above-mentioned space, the heater capacity is limited, and the temperature difference between the inside temperature and the outside air is only a few degrees Celsius, so dew condensation can occur inside the machine and on the air filter (1) depending on the temperature changes between day and night and the humidity in the air. Therefore, even though a heater is provided, rust may develop in various parts inside the machine, or insulation resistance may decrease.

This invention was made to eliminate the above-mentioned drawbacks, and one embodiment of this invention will be described below with reference to FIG. 2. The bottom of the motor frame (4) shown in Figure 1 (
For example, a vibrator ofa as shown in Fig. 2 is installed in part A of Fig. 1, and the action of this heat vibration actively promotes dew condensation inside the machine. 0 In other words, during operation, the temperature of each part inside the machine and the temperature of the inside air are higher than the outside air, so when the operation is stopped, the temperature of each part and the inside air approaches the outside temperature, but if this temperature falls below the dew point, , dew condensation occurs.The heat pipe is affected by the outside temperature the most out of all the parts, so the temperature drops faster than any other part inside the machine, and condensation occurs.In this way, the heat pipe When condensation occurs, the dew point inside the machine decreases, making it increasingly difficult for other parts to form condensation (because the heat capacity of each part is much larger than that of a heat pipe).

As the temperature of the heat pipe decreases the fastest, dew condenses on the heat pipe. However, by repeating this process, condensation occurs only on the inside air contact part of the heat pipe, and on other parts and the filter (1) I/r- There is no condensation at all. This also applies when a temperature difference occurs between daytime (high temperature) and nighttime (low i) when the electric motor is stopped.

In addition, the use of heat pipes also has the effect of contributing to cooling the inside of the machine during operation.

As shown in the plan view, there is a dent in the heat pipe mounting part (2)
By providing this, the condensed water will collect in this recess and will not flow out anywhere else, which will prevent rust from forming on various parts inside the machine. Also, if the dent itself is made of a suitable material or plated, rust can be prevented.

If you start operation in the state shown in Figure 2, the condensed water that has accumulated in the recess will evaporate due to the heat generated by the coil and core, and there will be no problem. If 04 is installed or an automatic drainage device (not shown) is installed,
It is still valid.

Note that the shape of the condensed water reservoir is not limited to a recess, but may be of other shapes, and may be directly attached to the heat pipe.

Although the above-mentioned embodiment shows the case of a fan type electric motor, the present invention can be applied to all types of fully enclosed rotary machines, stationary machines, and appliances that require insulation, rust prevention, and dew condensation prevention.

As described above, according to the present invention, a small plug space at the bottom of the container is sufficient for installing the heat pipe, so there is no need for a large space required for installing a conventional heater, and there is no need for a power source for the heater. This can effectively prevent dew condensation from forming on various parts inside the container.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view showing a conventional full-gate fan-shaped electric motor, FIG. 2 is a cross-sectional view of a main part showing one embodiment of the present invention, and FIG. 8 is a cross-sectional view of a main part showing another embodiment of the present invention. It is. In the figure, (4) is a frame, (6) is a heat pipe, (l
Ll is a recess, and 04 is a drain hole. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno −

Claims (2)

[Claims] (1) A dew condensation prevention device for a completely enclosed device that includes a built-in heating element, characterized in that a heat pipe is attached to the bottom of the frame of the totally enclosed device, and a condensation water reservoir is provided in the heat pipe attachment part. (2) The dew condensation prevention device for a completely enclosed device according to claim 1, wherein the condensation water reservoir is a recess provided on the inner surface of the frame of the heat pipe attachment portion. -(8) Connect the heat pipe to the part where it penetrates the frame.