JPH0452581Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a blower device with a heater built into an air conditioner or the like.

(b) Conventional technology Conventionally, the structure of an air conditioner with a built-in blower with a heater is such that the blower is placed inside the air inlet of the air conditioner, and the heater and heat exchanger are placed in the air passage on the discharge side of the blower. were arranged in sequence, and the air discharged from the blower was passed through the heater and heat exchanger to condition the air in the room. When the air filter is clogged, the amount of air discharged from the blower decreases and the heater becomes abnormally heated, the temperature of the air that has risen due to this heating is detected by a temperature sensor placed above the heater, and the heater is activated. Controls energization to.

However, even if the air volume discharged from the blower decreases, the heated air tends to be blown away by the flow of air discharged from the blower.
The temperature of this air was difficult to detect with a temperature sensor.

For this reason, Japanese Utility Model Application Publication No. 62-9025 blocks the windward side of this temperature sensor with a shielding plate to prevent the flow of air that has risen due to abnormal heating of the heater when the amount of air discharged from the blower decreases. This makes it easy to detect the temperature of this air with a temperature detector.

(c) Problems that the invention aims to solve If the windward side of the temperature sensor of the heater is blocked by a shielding plate as described above, this shielding plate is located on the discharge side of the blower and extremely close to the blower. , the wind gets caught in the leeward side of this shielding plate, and the wind speed distribution near this shielding plate becomes extremely unstable, making it difficult for the air caused by the abnormal heating of the heater to be guided to the temperature detector, making it impossible to detect abnormal heating of the heater. figure,
There was a risk that the air conditioner cabinet would be deformed.

The purpose of the present invention is to enable reliable detection of abnormal heating of the heater.

(d) Means for solving the problem In order to achieve this objective, the present invention provides a shielding plate on the windward side of the temperature detector of the heater, and also includes a shielding plate at a point lower than the temperature detector. It is designed to have ventilation holes in it.

(E) Effect Even if the rotation speed of the blower decreases, some of the air discharged from the blower passes through the ventilation opening and rises towards the temperature sensor, so this rising air is heated by the heater. The trapped air is attracted and reaches the temperature sensor.

(F) Embodiment In Fig. 5, 1 is a window type air conditioner, which includes an outer box 2, a main body 3 housed in the outer box,
It consists of a front panel 4 attached to the front of the main body.

A suction port 5 and an operation section 6 are formed on the left side of this front panel 4, and an air outlet 7 is formed on the right side.

6 to 8, 47 is an air filter disposed on the back side of the suction port 5, and 8 is a partition plate erected on the base 9, which divides the main body 3 into an indoor chamber A and an outdoor chamber B. are doing.

Reference numeral 10 denotes a fan motor, which is fixed to the outdoor side surface 11 of the partition plate 8, and one rotating shaft 12 of this motor passes through the partition plate 8 and projects into the indoor chamber A. A propeller fan 14 is attached to the other rotating shaft 13. 15 is an outdoor heat exchanger, 1
6 is an air guider on the outdoor side, and 17 is a compressor.

Reference numeral 18 indicates a Sirotskov fan fixed to one of the rotating shafts 12, and 19 indicates a casing of this fan, which is fixed to the partition plate 8. 20 is a suction port formed on the front surface of the casing 19, and 21 is a discharge port formed on the right side surface. The air blower is constituted by the Shirotsuko fan 18 and the casing 19.

Reference numeral 22 denotes a ventilation opening that communicates the indoor chamber A and the outdoor chamber B, and 23 denotes a damper disposed in the ventilation opening 22. This damper 23 rotates around a support shaft 24 to open and close this ventilation port 22.

25 is a heater attachment member fixed to the partition plate 8, and one heater 29 is attached thereto as shown in FIG.

Reference numeral 26 denotes a baffle plate fixed to the indoor side surface of the partition plate 8, and the height of this plate substantially matches the height of the indoor heat exchanger 27. The left end piece 28 of this baffle plate 26 is located on the leeward side between the heaters 29, and the right end piece 30 is close to the windward side surface 31 of the indoor heat exchanger 27.

The arrangement relationship between the heater mounting member 25 and the casing 19 is as shown in FIGS. 1 and 2, and the heater mounting member 25 is connected to the vertically extending connecting rod 3
2, four mounting plates 33, 34, and 35 are arranged vertically. And these four mounting plates 33, 3
One heater 29 is attached to each of the heaters 4 and 35 in a meandering manner through an insulator 36, and both ends 44 of the heater 29 are fixed to the second mounting plate 34. 37 is a terminal fixed to the first mounting plate 33, and this terminal 37 and both ends of the heater 29 are connected by fuses 45, respectively. The first mounting plate 33 has a substantially L-shaped cross section, and the short pieces 38 are positioned vertically and the long pieces 39 are positioned horizontally, and a temperature sensor 40 is inserted into the long pieces 39. A hole 41 is provided. When the detector 40 is inserted into the hole 41, the temperature sensing portion 42 of the detector 40 protrudes below the long piece 39. On the other hand, the short piece 38 is shown in FIG.
A substantially U-shaped shielding plate 46 shown in FIG. 4 is fixed with screws 48, and the temperature sensor 4 is
0 in three directions (see broken lines in Figure 7). The height dimension a of this shielding plate 46 is 33 mm, and the horizontal dimension b is 68 mm.
mm, and the depth dimension c is 39 mm. Also, this shielding plate 4
A comb-shaped notch 43 (ventilation hole) is formed on the front side of 6, and the width d of this notch is 5.
mm, height dimension e is 19 mm, dimension between cuts f is 5
mm. When this shielding plate 46 is attached to the short piece 38, the upper part of the notch 43 is located below the temperature sensor 40.

With this configuration, during heating operation, heater 2
9 is energized, the indoor heat exchanger 27 acts as a condenser, and the Sirotskov fan 18 is rotated. As a result, indoor air is sucked in from the suction port 20, and this indoor air is discharged from the discharge port 21 of the casing 19. It is discharged. The discharged air is heated by the heater 29, and then the air guide plate 26 reduces the deviation in the wind speed distribution of the air flow, and the indoor air is blown against the indoor heat exchanger 27. The air heated by this heat exchanger is discharged from the air outlet 7 of the front panel 4. At this time, a part of the air flow discharged from the casing 19 hits the front of the shielding plate 46 of the heater mounting member 25, and the comb-shaped notches 43
A portion of the flow flows along the lower surface of the first mounting plate 33 .

If the air filter 47 becomes clogged,
The amount of air discharged from the discharge port 21 of the casing 19 decreases. This decrease in air volume may cause the heater 29 to become abnormally heated. At this time, a part of the air discharged from the discharge port 21 is caused to flow along the lower surface of the first mounting plate 33 through the notch 43 in the front of the shielding plate 46, and the air generated on the leeward side of the shielding plate 46 is By reducing entrainment and stabilizing the wind speed distribution near this mounting plate 33, that is, near the temperature detector 40, it becomes easier for the temperature detector 40 to detect the temperature of the air that has increased due to abnormal heating of the heater 29. Controls the temperature of the heater.

FIG. 9 shows the temperature change near the top of the heater 29 when the air filter 47 is assumed to be clogged. of
Approximately 12 hours after the start of operation in a state of 80% blockage)
After a few minutes, the temperature near the bottom surface of the mounting plate 33 reached 82° C., so the temperature detector 40 was activated to control the energization of the heater 29, thereby preventing the heater 29 from overheating. Moreover, since the temperature reached 82° C. again after 16 minutes, the temperature detector 40 is activated to control the energization of the heater 29.

In the above embodiment, a comb-shaped notch 43 is provided on the front surface of the shielding plate 46, and this notch 43 is used as a ventilation hole. However, the present invention is not limited to the shape of this notch, and the capacity of the heater 29 Various modifications may be made depending on the size of the blower and the like.

(g) Effects of the device As mentioned above, in a device in which a heater and a temperature sensor for this heater are arranged on the leeward side of the blower where the wind speed distribution is difficult to stabilize, a shielding plate is provided on the windward side of the temperature sensor. At the same time, this shield plate has a ventilation hole installed at a location lower than this temperature sensor, so even if the air volume discharged from the blower decreases due to clogging of the air filter, etc., the temperature will not be heated by the heater. The air heated by the heater is attracted by the air rising from the ventilation opening toward the temperature sensor, so the temperature sensor can reliably detect the heat generated by the heater and prevent the heater from heating up abnormally. can be prevented. Further, by preventing abnormal heating of the heater in this way, deformation of equipment such as a cabinet due to heat can be prevented.

Furthermore, if this ventilation hole is made into a vertical slit,
The air flowing out from this slit is rectified and flows smoothly to the temperature detector, making it possible to more reliably detect abnormal heating of the heater.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is an exploded perspective view showing the main parts of the blower with heater, Fig. 2 is a front view of the blower with heater, and Fig. 3 is a view of the shielding plate. A perspective view, FIG. 4 is a front view of this shielding plate,
Figure 5 is an exploded perspective view of an air conditioner incorporating this blower with heater, Figure 6 is a plan view of the main body of the air conditioner with the top plate removed, and Figure 7 is an enlarged view of the main parts of Figure 6. , FIG. 8 is an elevational view showing the front of the main body of the air conditioner, and FIG. 9 is a diagram showing the temperature change at the upper part of the heater when the filter is closed to 80%. 18...Syrotskov fan, 19...Casing, 29...Heater, 33...Mounting plate, 43...
Notch (ventilation hole), 46...shielding plate.

Claims (1)

[Claims for Utility Model Registration] 1) In a blower device with a heater, which is provided with a heater and a temperature sensor for the heater in the air passage on the discharge side of the blower, a shielding plate is provided on the windward side of the temperature sensor, and , a blower device with a heater, characterized in that the shielding plate is provided with a ventilation hole at a location lower than the temperature sensor. 2) The blower device with a heater according to claim 1, wherein the ventilation opening is a vertically long slit.