JPS61265449A - Warm-air type heater - Google Patents

Abstract

PURPOSE:To permit to restrain temperature rise in the atmosphere of a control circuit by a method wherein the upstream side of a warm-air path is communicated with the discharging space of warm-air through a ventilating hole provided near the ventilating block of main body of the warm-air heater, in a heater for vehicle or the like. CONSTITUTION:When the main body 6 of the heater is started, cold atmosphere is guided through a suction port 3 into the warm-air path 5 by a ventilating fan 20 and is heated during passing through a heat source block 1, thereafter, warm-air is discharged once form a discharging port 4. Thereafter, the flow of warm-air tries to return to the upstream side of the discharging space 9 by collision against the wall surface of an outer case 10 or the like, however, is precluded by cold air from the ventilating hole 22 and is ventilated to atmosphere through the outer case 10 and a blow-off port 11. Accordingly, the temperature rise of the control circuit 7, provided near the ventilating hole 22, due to the warm-air may be restrained. On the other hand, a small amount of cold air, discharged through the ventilating hole 22, is sufficient and, therefore, the blow-off temperature of the main body 6 of heater will never be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot air heater, such as a combustion type, used for heating automobiles and the like.

BACKGROUND OF THE INVENTION Conventionally, as shown in FIG. 3, this type of combustion-type hot air heater has a combustion-type heat source block 1 and a blower block 2, and has a suction port 3 that opens to the outside air and the heat source. The discharge port 4 on the downstream side of the block 1, and the heat source block 1. The hot air passage 6 around the outside of the blower block 2 constitutes a heater main body 6, and the control circuit 7 is installed around the outside of the heater main body 6. An outer case 10 is provided that forms a discharge space 9 containing a pump 8 and the like. The upstream side of the heater body 6 of the discharge space 9 is closed, and the downstream side has a blow-off port 11 that opens to the outside air, facing the discharge port 4, and the cold air flows from the suction port 3 into the heater body θ as shown by the arrow. The hot air is exchanged with heat through the hot air path 6, and is then discharged into the discharge space 9 through the outlet 4, and then sent to the outside air through the outlet 11.

Problems to be Solved by the Invention However, in the above configuration, in order to suppress the ambient temperature of the control circuit 7, the outlet 11 must be made large so that the hot air does not flow to the upstream side of the discharge space 9. However, the present invention solves these conventional problems by bypassing a portion of the cold air in the hot air path into the discharge space. The purpose is to suppress the temperature rise in the control circuit atmosphere.

Means for Solving the Problems In order to solve the above problems, the hot air heater of the present invention communicates the upstream side of the hot air path with the discharge space through a ventilation hole provided near the air blowing block of the heater body. It has a configuration.

Function: With the above-described configuration, the blower constituting the blower block guides outside air that is colder than the suction port into the heater main body, and connects the ventilation hole provided near the high-pressure blower block to the discharge space. A portion of the outside air is discharged into the discharge space through the vent hole and flows toward the outlet where the pressure is lower.On the other hand, the warm air blown out from the discharge outlet into the discharge space through the hot air path flows through the outlet of the outer case wall. Although it tries to flow upstream due to a collision or the like, the pressure gradient prevents it from flowing upstream.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In FIG. 1, the configuration different from the conventional example is the ventilation fan 20. A ventilation hole 22 that communicates the hot air path 6 and the discharge space 9 is provided in the vicinity of the high pressure discharged from the ventilation hole 2Q of the ventilation block 2 constituted by a motor 21 and the like. Note that the same parts as in FIG. 3 are given the same numbers.

In the above configuration, when the heater main body 6 is started, cold outside air is blown from the suction port 3 to the hot air path 5 by the ventilation fan 20.
When the air passes through the heat source block 1, it undergoes heat exchange and becomes warm air, which is then discharged through the outlet 4. After that, the flow of hot air is caused by collision with the outer case 1° wall surface, etc., and the discharge space e
attempts to return to the upstream side of the outer case 10., but is blocked by the cold air from the vent hole 22 located on the side with a higher pressure gradient within the discharge space 9, and the outer case 10. Air is blown to outside air through the outlet 11. As a result, the control circuit 7 provided near the ventilation hole 22
The temperature increase due to the warm air can be controlled, and the amount of cold air discharged from the ventilation hole 22 may be small, so that the blowing temperature of the heating body 6 will not be lowered.

Next, another embodiment of the present invention will be described with reference to FIG. A ventilation hole 22 is provided to force the cold air to flow downstream, thereby reducing the pressure loss when the air is discharged from the ventilation hole 22, and making the area where cold air and hot air are mixed in the discharge space 9 more It can be placed on the downstream side.

Note that the heat source block 1 may be of an electric type or other type instead of a combustion type.

Effects of the Invention As described above, according to the hot air heater of the present invention, the following effects can be obtained.

(1) Since the hot air upstream side and the upstream side of the discharge space where the control circuit is located are communicated through the vent provided near the blower block of the heater body, a pressure gradient is generated in the discharge space, and the discharge The warm air blown out from the outlet is blown to the outside air from the outlet without returning to the upstream side where the control circuit is located, and the temperature rise in the atmosphere of the control circuit can be suppressed.

(2) In the discharge space on the downstream side of the control circuit, there are no restrictions on the position or size of the outlet, improving the temperature distribution characteristics in the heater main body installation room, and making it possible to adjust the outlet temperature by adjusting the area of the outlet, for example.

(3) By making the ventilation hole into a raised shape and configuring a guide part that opens only on the downstream side, it is possible to increase the pressure gradient in the discharge space and move the area where cold air and warm air are mixed further downstream. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a hot air heater according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of the second embodiment, and FIG. 3 is a plan view of a conventional combustion heater. It is a diagram. 1...Heat source block, 2...Blower block, 5...Hot air path, 3...Suction port,
4... Discharge port, 6... Heater body, 7
...Control circuit, 9...Discharge space, 10
...Outer case, 11...Air outlet, 2
2...Vent hole. Name of agent: Patent attorney Toshio Nakao and one other name
2 Figure

Claims (2)

[Claims] (1) A heat source block and a blower block are arranged upstream of the heat source block, with a hot air passage around the outside, an inlet opening to the outside air on the upstream side of the blower block, and a discharge port on the downstream side of the heat source block. An outer case is arranged on the upstream side of the outer periphery of the heater body to form a discharge space with a built-in control circuit, etc., and the upstream side of the discharge space is closed, while the downstream side is open to the outside air. A hot air type heater which is provided with a blowout port which communicates with the discharge port, and communicates the upstream side of the air path with the upstream side of the discharge space via a vent provided near the blower block of the heater main body. (2) The hot air heater according to claim 1, which includes a cut-out ventilation hole that opens toward the downstream side.