JPH04359750A - Electrical heater - Google Patents

Abstract

PURPOSE:To provide an electrical heater capable of decreasing a temperature of hot air discharged from an upper surface discharging port so as to decrease a temperature of an upper surface panel, prohibiting a danger of taking a fire burn and releasing a restriction of material which can be used. CONSTITUTION:An electrical heater is comprised of a main body 1 having an upper surface panel 4, side plates 2 and a bottom plate 3; a heater 6 disposed within the main body 1; and a heat shielding plate 5 disposed between the main body 1 and the heater 6 and having a step 5a to cause a spacing between them to be narrower at a lower part than the upper surface position of the heater 6. The first passage A is formed in a spacing enclosed by the heat shielding plate 5, the second passage B is formed in a spacing enclosed by the heat shielding plate 5 and the main body 1, a communication hole 10 is formed at the step part 5a. Each of the upper surface panel 4, bottom plate 3 and side plates 2 of the main body 1 is provided with an upper surface air discharging port 9, a main suction port 8 and a sub-suction port 11, respectively and the sub-suction port 11 and the communication hole 10 are communicated to each other. In addition, a surrounding part of the upper discharging port 9 is provided with a cold air discharging port 12, and the cold air discharging port 12 is communicated with the sub-suction port 11 through the second passage B.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a natural convection electric heater which reduces the risk of burns and alleviates restrictions on the materials that can be used.

0002

2. Description of the Related Art FIG. 3 is a longitudinal sectional view showing an example of a conventional natural convection type electric heater. 1 is a main body; 2, 3, and 4 are side plates, a bottom plate, and a top panel of the main body 1; and 5 is a heat shield plate provided inside the main body 1 and attached in parallel with the side plate 2. Reference numeral 6 indicates a substantially rectangular heater mounted within the heat shield plate 5, and reference numeral 7 indicates a plurality of radiation fins attached to both sides of the heater 6. Reference numeral 8 indicates a plurality of main intake ports provided on the bottom plate 3, and reference numeral 9 indicates an upper surface exhaust port provided on the upper surface panel 4.

Next, the operation of the electric heater constructed as described above will be explained. When the heater 6 is energized, the air inside the heat shield plate 5 is heated and rises, and is discharged to the outside from the top exhaust port 9 to warm the room. On the other hand, as warm air is released, cold air from the lower part of the room is sucked into the main body 1 through the intake port 8, warmed by the heater 6, and raised inside the heat shield plate 5. In this way, convection occurs inside the room and the indoor air is efficiently heated.

0004

[Problems to be Solved by the Invention] In the conventional electric heater configured as described above, the warm air discharged from the top exhaust port 9 during heating is high temperature, so the top panel 4 is heated by the warm air and reaches a high temperature. There is a risk of burns if you touch the surface. Furthermore, since the top panel 4 becomes hot, there is a problem in that the materials that can be used for the top panel 4 are severely restricted.

The present invention has been made to solve the above-mentioned problems, and provides a hot-air heating system that can lower the temperature of the top panel to prevent the risk of burns, and can also alleviate restrictions on the materials that can be used. The purpose is to obtain a vessel.

[0006]

[Means for Solving the Problems] An electric heater according to the present invention includes a main body consisting of a top panel, a side plate, and a bottom plate, a heater provided in the main body, and a space between the main body and the heater. a heat shield plate having a stepped portion that is narrower at a lower position than the upper surface position of the heater, and a space surrounded by the heat shield plate forms a first passage, and a space surrounded by the heat shield plate and the main body A second passage is formed by the enclosed space, and a communication hole is provided in the stepped portion, and a top exhaust port, a main intake port, and a sub-intake port are provided in the top panel, bottom plate, and side plate of the main body, respectively. It communicates with the communication hole.

Furthermore, a cold air discharge port is provided around the upper surface exhaust port, and the cold air discharge port is communicated with the sub-intake port via a second passage.

[0008]

[Operation] Cold air is sucked into the second passage from the sub-intake port, and then sucked into the first passage through the communication hole, where it mixes with the warm air heated by the heater to lower the temperature of the warm air, causing the upper Decrease the temperature of the panel.

[0009] Furthermore, the cool air is ventilated through the cold air outlet provided around the top exhaust port to cool the top panel, thereby lowering the temperature of the top panel.

0010

[Embodiment] Fig. 1 is a vertical cross-sectional view showing an embodiment of the present invention, and Fig. 2
is a sectional view taken along line A-A. Note that the same symbols are attached to the same or equivalent parts as in the conventional example shown in FIG. 3, and the explanation thereof will be omitted. 5
is an integrated heat shield plate installed in the main body 1, and the distance between the heat shield plates becomes narrower below a stepped portion 5a provided at the same height as the upper surface of the heater 6. 10 is a communication hole provided in the stepped portion 5a of the heat shield plate 5; 11;
is a sub-intake port provided at the lower side of the main body 1. Note that it is preferable that the sub-intake port 11 be located below the position of the communication hole 10, and that the area of the sub-intake port 11 be larger than the area of the communication hole 10. Reference numeral 12 denotes a cold air outlet provided in the upper panel 4. Therefore, in this embodiment, the first passage A is formed in the space surrounded by the heat shield plate 5, and the second passage B is formed in the space surrounded by the heat shield plate 5 and the main body 1. Note that 13 is a heater attachment plate for attaching the heater 6 to the heat shield plate 5.

Next, the operation of this embodiment constructed as described above will be explained. When the heater 6 is energized, the air inside the heat shield plate 5 is heated and the air inside the heat shield plate 5, that is, the first passage A is heated.
rise within. Therefore, the area around the communication hole 10 provided in the stepped portion 5a of the heat shield plate 5 becomes negative pressure, and the cold air sucked into the second passage B from the sub-intake port 11 is efficiently transferred to the first passage A. It is sucked in by the air, and here it rises, mixing cold and warm air. Therefore, this upward flow reaches the upper panel 4 at a lower temperature than when only warm air is present, and the upper exhaust port 9
It is emitted to the outside and warms the room.

[0012] If the sub-intake port 11 is located lower than the communication hole 10 and the area of the sub-intake port 11 is made larger than the area of the communication hole 10, cold air will flow from the second passage B. It is efficiently drawn into the first passage A, facilitating the temperature reduction. Furthermore, if the cold air discharge port 12 is provided near the top exhaust port 9 of the top panel 4, a portion of the cold air that has passed through the sub-intake port 11 rises in the second passage B, and introduces the cold air into the vicinity of the top panel 4. The upper panel 4 is directly cooled.

On the other hand, as warm air is released, cold air from the lower part of the room is sucked into the first passage A through the main intake port 8, where it is heated by the heater 6 and flows into the first passage A surrounded by the shielding plate 5. rise within. In this way, convection occurs inside the room and the indoor air is efficiently heated.

[0014] In the above description, the heat shield plate 5 is molded as a single piece, but the heat shield plate 5 may be divided at the step portion 5a. Furthermore, although the sub-intake port 11 for introducing cold air into the communication hole 10 is provided in the main body 1, this may be provided in the bottom surface.

[0015]

As is clear from the above description, according to the present invention, the sub-intake port is provided in the main body, and the distance between the heat shield plates is greater than the step portion provided at the same height as the top surface of the heater. It is formed so that it becomes narrower at the bottom, and a communication hole is provided in the stepped part, and the sub-intake port and the communication hole are communicated with each other to mix warm air and cold air, thereby lowering the temperature of the warm air and increasing the temperature of the top panel. can be lowered.

[0016] Furthermore, a cold air discharge port is provided near the top surface exhaust port of the top panel, and this is communicated with the sub-intake port so that cold air is discharged from the cold air discharge port, so that the top panel can be directly cooled. . Therefore, the risk of burns can be reduced and restrictions on the materials used can be relaxed.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a longitudinal sectional view showing an example of a conventional electric heater.

[Explanation of symbols]

1 Main body 2 Side plate 3 Bottom plate 4 Top panel 5 Heat shield plate 5a Step part 6 Heater 8 Main intake port 9 Top exhaust port 10 Communication hole 11 Sub-intake port 12 Cold air outlet A First passage B Second passage

Claims (2)

[Claims] 1. A main body consisting of a top panel, a side plate, and a bottom plate, a heater provided in the main body, and a space between the main body and the heater that is narrower below the top surface position of the heater. a heat shield plate having a stepped portion configured such that a first passage is formed by a space surrounded by the heat shield plate, and a second passage is formed by a space surrounded by the heat shield plate and the main body. A passage is formed, and a communication hole is provided in the stepped portion, and a top exhaust port, a main intake port, and a sub-intake port are provided in the top panel, bottom plate, and side plate of the main body, respectively, and the sub-intake port and the communication hole are connected to each other. An electric heater characterized by being connected to each other. 2. The electric heater according to claim 1, wherein a cold air outlet is provided around the upper surface exhaust port, and the cold air outlet is communicated with the auxiliary intake port via a second passage.