JPS5883151A - Forced air supply/exhaust hot air fan - Google Patents

Abstract

PURPOSE:To enhance thermal efficiency and make a product small in size, by a method wherein a pulse burner excellent in heat-transmitting characteristics on the combustion gas side is used as a heat source. CONSTITUTION:The pulse burner which is comprised of a combustion chamber 10, an exhaust pipe 11, a valve device 12, an ignition plug 13 and a starting blower 14 for combustion is provided at a burner port of a conventional forced- feed forced-exhaust type hot-air heater, and a heat exchanger 15, a muffler 16 and an exhaust duct 21 are connected to the downstream side of the exhaust pipe 11. The blower 14 is driven for a short period of time only in a starting operation, and it is stopped after the operation is transferred to an automatic operating cycle.

Description

[Detailed description of the invention] The present invention relates to a forced air supply/exhaust hot air fan.

Conventionally, a forced air supply/exhaust type hot air fan has a configuration as shown in Fig. 1, and its operating mechanism introduces fuel and air through a fuel inflow line 1 and an air inflow line 2, and then blows the air into a burner section 3. burn it,
This combustion gas is passed through a heat exchanger 4, and a convection blower 6 is used to send warm air 6 indoors. At this time, the combustion air 7 is taken in from outside and passed through the heat exchanger 4 to drive the combustion blower 8.
The gas is discharged outdoors as exhaust gas9.
Therefore, during combustion, the combustion blower 8 is constantly operated, which increases power consumption and is disadvantageous in terms of noise. In addition, the use of a large-capacity blower that can produce one blow per continuous rotation is expensive. Unfortunately, there are limits to the high-load combustion characteristics and combustion start-up characteristics, so the burner part cannot be made smaller, and even after starting, it takes several minutes (5 to 6 minutes) to generate warm air. It's hot ζ. Furthermore, in the case of conventional hot air blowers, heat transfer is very fast! 1
The reality is that in order to secure the required heating load, a large heat transfer area is inevitably required, making it difficult to downsize the product. Conventionally, measures have been taken to create turbulent flow in an attempt to increase thermal efficiency, but this not only creates ventilation resistance but also complicates the structure and is disadvantageous in terms of cost. In view of the above problems, the present invention aims to provide a compact forced air supply/exhaust hot air fan having high-load combustion characteristics and excellent heat transfer characteristics by applying a ζ Lus combustor.

The present invention will be described in detail below using the drawings.

In Fig. 2 and Fig. 3, the combustion chamber 10, the exhaust/quive 1
1. A pulse combustor consisting of a pulp device 12, a spark plug 13, and a combustion starting blower 14 is located in the burner section of a conventional forced air hot air fan, and a heat exchanger 16 is located downstream of the discharge pipe 11. , and a muffler 16 are installed. However, here, the heat exchanger 15 also has the role of alleviating pressure fluctuations during pulse combustion, and takes the form of a hollow cylinder. The discharge pipe 11 and the heat exchanger 15
Convection blowers 1 and 7 are arranged behind the muffler 16 and the muffler 16, and the heat exchanged by these blowers is turned into warm air and is blown out to the front.

When starting, it is necessary to operate the combustion starting blower 14 and the spark plug 13, but once a self-excitation cycle is formed, negative pressure is generated in the combustion chamber 10 and the air supply pipe a1
8. Combustion air is automatically sucked into the combustion chamber 1o through the air supply pipe b19 and the pulp device 12, and combustion is continued by spontaneous ignition. Therefore, the pulsation of the combustion starting blower 14 and the spark plug 13 at the U:1 point is no longer necessary. Second, in the case of pulse combustion, the amount of combustion air required at startup is small, so (it can easily start up even when the excess air ratio is close to 1,
Conventionally, the combustion starting blower 14 is
Can use smaller abilities. By using a commutator motor with a high rotation speed as the drive motor 20 of this small-sized combustion starting blower 14, the combustion starting blower can be further downsized and can also be used at low voltage. Although the above-mentioned commutator motor has a short time, it can be used without any problems since it takes only a few seconds (2 to 3 seconds) to start with C11 in pulse combustion. 3. -d/l, also for the supply air, let the combustion air flow into the device from outside with a large negative pressure.
Since this is sucked into the combustor, the air supply pipe a18 and the air supply pipe b19 can have smaller diameters than conventional ones in terms of component parts. Thereafter, when a self-exciting cycle is formed and pulse combustion continues, the combustion gas flows into the combustion chamber 10. discharge pipe 11, heat exchanger 16,
It passes through the muffler 16 and the exhaust duct 21 and is exhausted outdoors. Since combustion gas is exhausted by the large pressure generated within the combustion chamber 10, the exhaust duct 21 may also have a smaller diameter than conventional ones. In the case of pulse combustion, not only the combustion gas flow velocity is large, but also the pressure and velocity fluctuations are remarkable, which suppresses the development of the boundary layer and improves the heat transfer characteristics on the combustion gas side ( Conventional steady combustion 2~
3 times), the required heat transfer area can be reduced, and heat exchanger 1
5 is small.

As described above, by applying a pulse combustor with excellent heat transfer characteristics on the combustion gas side to a forced air supply/exhaust hot air fan, the present invention can improve the thermal efficiency of the device and also reduce the size of the product. This made it possible. In addition, unlike conventional forced air supply and exhaust hot air fans, once a self-excitation cycle is established, the combustion starting blower 14 is no longer required, which reduces power consumption and is also beneficial for noise control. In pulse combustion, the combustion air can be started in a short time using only a small amount of combustion air. By using a commutator motor as the motor, it is possible to further reduce the size and use low voltage.

In addition, a tank having a high-load combustion 'l, '+1'l,
The combustion chamber can also be made smaller, and the structure of the bar is simple, so manufacturing costs can be reduced. - Still based on explosive combustion in principle /(-, l'/), it has two characteristics: 1. - It is also possible to shorten the time conventionally required for hot air to come out after startup. Since pressure fluctuations are also large, the diameter of the vibrator for feeding air can also be made smaller than before, which is advantageous in terms of cost.

From the above points of view, a forced air supply/exhaust hot air fan with excellent performance and low cost is proposed.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional forced air supply/exhaust type η11i wind turbine.
FIGS. 2 and 3 are a front view and a side view of a pulse combustion hot air fan according to an embodiment of the present invention. 3...Burner part, 4...Heat exchanger, 1o
... Combustion chamber, 11... Exhaust pipe, 16...
...Heat exchanger, 16 ...Muffler, 21...
Exhaust duct. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 // f2 Figure 3 f'/ /4

Claims (2)

[Claims] (1) Pulse combustion comprising a combustion chamber, an exhaust pipe connected to the combustion chamber, a valve device located on the second flow side of the combustion chamber that automatically opens and closes according to pressure fluctuations within the combustion chamber, a spark plug for starting, and a blower. A forced air supply/exhaust hot air fan, which uses a heat exchanger as a heat source, and a heat exchanger and a muffler provided downstream of the discharge pipe. (2) A forced air supply/exhaust type warm air fan according to claim 1, which uses a commutator motor to drive the fan.