JPS6191440A - Device for preventing overheating of heater in air conditioner - Google Patents

Abstract

PURPOSE:To prevent the heater from overheating by constituting a heater radiating heat shielding plate of a heat sensitive part of a temperature relay so that the shielding plate is subjected to shape variation at a set temperature to receive the heater radiating heat. CONSTITUTION:A shielding plate 5 made of a shape memory alloy is so set that it changes its shape at a proper temperature. At an extraordinary time, the heat sensitive part 6 of the temperature relay 2 strongly receives the radiation of the heater 1 because the shield is removed, and the temperature of the heat sensitive part 6 rapidly rises up and acts. At the extraordinary time when the ambient temperature of the heater rapidly rises up, the shielding plate 5 undergoes a change by the abmient temperature and the heater radiation heat, and the shield of the heat sensitive part is removed whereby the radiation heat of the heater 1 is absorbed by the heat sensitive part, and a delay in the thermal response is reduced. As a result, the temperature rise in the component parts in the circumference of the heater can be suppressed.

Description

Detailed Description of the Invention Field of the Invention The present invention relates to a device for preventing overheating of a heater in an air conditioner, and more particularly to a device for more effectively preventing overheating of a heater installed in an air conditioner. In JAS type air conditioners, the heater may overheat when abnormalities occur, such as when the filter is clogged, when a curtain etc. blocks the intake port, or when the fan or fan motor malfunctions and no longer blows air. In order to prevent the air conditioner's components from deforming, catching fire, or stopping other functions, a temperature relay or temperature fuse connected in series with the heater's electrical circuit is configured to stop power to the heater and prevent overheating. has been done.

Such a conventional example will be explained with reference to FIGS. 3 to 5.

FIG. 3 is a side sectional view of an indoor unit of an air conditioner equipped with a heater, including a heat exchanger 101, a water tray 102, and a fan 10G.
, a fan casing 104, a front 1m grill 105, a wind direction change plate 106, an outer box top plate 107, etc., and a heater overheat prevention device 108, as shown in the figure, is a heat exchanger 1t3.
101, a fan 103, a fan casing 104, and a large outer box plate 107.

FIG. 4 is a front view of the heater overheat prevention device seen from the entrance direction in FIG. In addition, the temperature relay 112
A temperature fuse 113 is attached to a fixed plate 111 via a mounting plate 114.

FIG. 5 is a sectional view taken along line BB in FIG. 4. 11
5 is a shielding plate that prevents radiation from the heater 109;
The temperature relay 112 is installed to prevent the temperature relay 112 from operating in normal times when the radiant heat from the air conditioner is strong and heat from the heater is required for air conditioning.

The temperature relay 112 does not operate under normal conditions when the heater 109 necessarily operates, but when the filter is clogged or the suction port is blocked by a curtain, etc., or when there is an abnormality such as the fan 103 stopping due to a failure. The heater is set to operate before overheating causes the air conditioner's components to deform, catch fire, or deteriorate. If the air volume decreases due to clogging of the filter, etc., and the ambient temperature of the heater 109 gradually increases, the heat sensitive part 11 of the temperature relay 112
Temperature relay 11 has little delay in thermal response at set temperature
2 works. However, with curtains, etc., the front creel 10
If the suction port 5 is blocked or the fan 103 stops, the temperature around the heater 109 will suddenly rise. At that time, the delay in the thermal response of the heat sensitive part 115 of the temperature relay 112 will become large and the operation will be interrupted. Due to the delay, the fan 103 and fan casing 104, which are components of the air conditioner,
, the front grill 105, the top panel 107 of the outer box, etc. may be thermally deformed or cause a fire.

In addition, in order to prevent this, the heat resistance of the air conditioner components has been increased, and the space between the heater 109 and the components has been increased, but the components have become more expensive and the air conditioner has become more expensive. It had problems such as increasing its size. □ Purpose of the Invention In view of the above-mentioned problems, the present invention effectively prevents overheating of the heater, thereby reducing the cost and size of the components of an air conditioner.

DESCRIPTION OF THE INVENTION In order to achieve this object, the present invention is configured such that the heater radiation heat shielding plate of the heat sensitive section of the temperature relay changes its shape at a certain set temperature and receives heater radiation.

With this configuration, in an abnormal situation where the temperature around the heater suddenly increases, the A-shield changes due to the ambient temperature and heater radiant heat, and the heat-sensitive part is no longer shielded, allowing the heater's radiant heat to be absorbed by the heat-sensitive part. , the delay in thermal response is reduced. This makes it possible to suppress the temperature rise of the components of the air conditioner around the heater.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a sectional view of a heater overheating prevention device, in which 1 is a heater and 2 is a temperature relay, which are attached to a fixed plate 4 via a mounting plate 3. Reference numeral 5 denotes a shielding plate made of a shape memory alloy, which changes shape as shown by the two-dot chain line above a certain set temperature, and returns to its original shape below a certain temperature. That is, above a certain set temperature, the heat sensitive jηb6 of the temperature relay 2 receives the radiant heat of the heater 1.

The songs 7T, JL, and Product are configured in the same way as before.

Next, the operation will be explained with reference to FIG.

First, if the shielding plate is fixed as in the past,
In an abnormal situation where the ambient temperature of the heater 1 suddenly rises, the operation of the temperature relay 2 is delayed due to a delay in the thermal response of the heat sensitive section 6.
As shown in a, the temperature of the heat sensitive section 6 increases to a temperature higher than the set temperature T1 of the temperature relay 2, and then operates. Along with this, the temperature of surrounding components also rises and changes like al.

On the other hand, in the case of the present invention, the shape memory alloy shielding plate is set to change its shape at an appropriate temperature, so that in the event of an abnormality, the temperature change of the heat-sensitive El of the temperature relay 2 is caused by the disappearance of the shielding. As a result, it is strongly affected by the radiation of the heater 1, and as shown in b, it rapidly rises and operates. Therefore, the rise in temperature of surrounding components can be suppressed to a low level.

As described above, in this embodiment, the temperature rise of the surrounding components due to overheating of the heater 1 can be suppressed to a low level in the event of an abnormality, so there is no need to use highly heat-resistant and expensive components. This often eliminates the high cost of materials.

Effects of the Invention As described above, the heater d heat prevention device for an air conditioner of the present invention is configured such that the radiant heat shielding plate of the heat sensitive part of the temperature relay changes its shape at a certain set temperature and receives heater radiation, thereby preventing abnormalities. By reducing the delay in the thermal response of the temperature relay, the temperature rise of the components surrounding the heater is suppressed.
It has excellent effects such as reducing material costs because it does not require the use of expensive materials with high heat resistance, and it allows air conditioners to be made smaller as there is no need to take up a large space to suppress temperature rises. .

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a heater overheating prevention device for an air conditioner according to an embodiment of the present invention, Fig. 2 is a custom-made drawing showing the temperature relay heat-sensing section and temperature changes of component parts during abnormal conditions, and Fig. 3 is FIG. 4 is a front view of the heater overheating prevention device as seen from the direction of a third country person, and FIG. 5 is a cross-sectional view taken along line B-E in FIG. 4. It is a diagram. 1... Heater, 2... Temperature relay, 3...
・Mounting plate, 4... Fixed plate, 5... Shielding plate, 6...
・Heat-sensitive part. Name of agent: Patent attorney Masao Nakao and 1 other person No. 1
Figure 2 Figure 2 Ichizaima Figure 3 Figure 5

Claims (1)

[Claims] The air conditioner includes a heater provided in the air conditioner, a temperature relay for sensing overheating of the heater and stopping power supply to the heater, and a shielding plate for shielding the temperature relay from radiant heat of the heater, and the shielding plate A heater overheat prevention device for an air conditioner, in which a plate changes shape at a certain set temperature and is configured to receive radiant heat from the heater.