JPS586219Y2 - heat exchange equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat exchange device in which a diffuse combustion burner is arranged at one end and a communication port communicating with an exhaust pipe is provided at the other end.

2 and 3 are simplified illustrations of hot air heaters using the above-mentioned type of heat exchange device, which have been conventionally known in publications and the like.

That is, a heat exchanger 22 having a combustion chamber 23 inside is disposed inside the exterior body 21, and one end of the heat exchanger 22 is equipped with a burner 24 for performing diffusion combustion, and the other end is equipped with a burner 24 through a communication port 25. A connection box 26 having an expansion type muffler configuration outside the exterior 21 and an exhaust pipe 27 are connected.

In addition, FIG. 3 shows a cross section along the line AA' in FIG. 2,
28 is a blower driven by an electric motor 29;
0 indicates an air supply port that sucks air into the exterior 21 by driving the blower 28, and 31 indicates a discharge port that discharges hot air to the outside of the exterior 21. The solid line arrow indicates the air flow, and the dot-dashed line arrow indicates the air flow. shows the flow of high temperature combustion exhaust gas generated in the burner 24.

With the above configuration, the high temperature combustion exhaust gas generated in the burner 24 is transferred to the heat exchanger 22° through the communication loss 5.
．． Air discharged to the outside from the exhaust pipe 27 via the connection box 26 and sucked in from the air supply port 30 by the blower 28 becomes warm air on the outer surface of the heat exchanger 22, and then flows through the discharge port 31 to the exterior body 21. It is discharged outside and used for heating.

On the other hand, a hot air heater having a burner 24 that performs diffusive combustion has the advantage that the ignition time or the rise time of the hot air temperature is short, but has the disadvantage that the noise associated with combustion is very large, especially when the exhaust pipe 27 The disadvantage is that the noise emitted to the outside through the heater is significantly louder than other systems, for example, hot air heaters having a pot-shaped burner section.

On the other hand, conventionally, as shown in FIG.
A countermeasure has been taken by configuring the inside of the junction box 26 that connects the exhaust pipe 27 and the exhaust pipe 27 as a silencer such as an expansion type silencer.

However, in the conventional case, a junction box 26 is provided, and this junction box 26 has to be insulated because it is overheated by the high-temperature combustion exhaust gas flowing inside.

The technical objective of the present invention is to eliminate the need for heat insulation treatment for the sound deadening section.

The present invention takes the following technical measures to solve this technical problem.

That is, a baffle body is disposed between one end and the other end of the heat exchanger, and a ventilation path is formed between the outer circumferential wall of the baffle body and the inner wall surface of the heat exchanger.

According to this technical means, a silencer is configured within the heat exchanger downstream of the baffle body, so sufficient noise reduction can be achieved, and since the heat exchanger is installed inside the exterior body, there is no need for thermal insulation treatment. It is.

One embodiment will be described below with reference to the accompanying drawings.

In FIG. 1, a primary heat exchanger 2 and a secondary heat exchanger 3 are arranged inside the external device, - one end of the coal heat exchanger 2 is provided with a burner section 4 for performing diffusion combustion, and the other end is provided with a burner section 4 for performing diffusion combustion; communicates with the secondary heat exchanger 3 via the communication port 5, and further communicates with the secondary heat exchanger 3 through the communication port 5.
It communicates with the outside of the device via an exhaust pipe 6 provided in the.

- Inside the coal heat exchanger 2, there is a burner section 4 with a length l'.
An inner cylinder (used as an example of a baffle body) 7 with its side closed is arranged so that the interior of the -charcoal heat exchanger 2 is separated into chambers A and B.
It is roughly divided into chambers, and a ventilation path 8 is formed between the inner wall surface of the coal heat exchanger 2 and the outer circumferential wall of the inner cylinder 7.

Furthermore, - the end face 9 of the coal heat exchanger 2 and the closed end 7 of the inner cylinder 7;
The inner cylinder 7 is disposed so that the length l between it and a is equal to the wavelength of the frequency to be silenced, and l'=+l or l'=+
Each dimension is set so that there is a relationship of l.

Note that the wavelength of the target frequency mentioned above is shown as a wavelength in consideration of the temperature inside the -charcoal heat exchanger 2.

Reference numeral 10 indicates a blower driven by an electric motor 11 to blow indoor air to the outer peripheral surface of the heat exchanger, and a solid arrow a indicates the flow direction of high-temperature combustion exhaust gas generated by the burner 4.

In the above configuration, high-temperature combustion exhaust gas generated as a result of combustion in the burner 4 can be removed by disposing an inner cylinder 7 with one end closed inside the coal heat exchanger 2 to form a ventilation path 8.
- The heat exchange efficiency of the heat exchanger 2 can be improved by flowing along the inner wall surface of the coal heat exchanger 2 and effectively transmitting the retained heat to the wall of the primary heat exchanger 2.

On the other hand, the noise generated due to combustion is emitted to the outside from the exhaust stack 6 through the same route as combustion exhaust gas. The noise emitted to the outside through the exhaust stack 6 is significantly reduced.

That is, the ventilation passage 8. Since the chamber B and the communication port 5 constitute an expansion type muffler, when noise propagates there, it receives a muffling effect.

Furthermore, since it is provided inside the exterior body 1, there is no need to perform heat insulation treatment on the sound deadening section.

In addition, - the end face 9 of the coal heat exchanger 2 and the closed end 7a of the inner cylinder 7;
Since the distance l between the two wavelengths is set to the wavelength of the frequency to be muted, the silencing effect can be most effectively obtained in this part.

Now, if the frequency to be silenced is 1000 Hz and the temperature of the hot air flow inside the -charcoal heat exchanger 2 is 700°C, then l-=.

It will be 19 cm.

Further, an expansion type muffler generally has a characteristic that it cannot obtain a muffling effect for frequency components that are integral multiples of the target frequency.

On the other hand, by setting the length l' of the inner cylinder 7 to l'=+l, the silencing characteristics of the frequency component can be doubled, and by setting the length l' of the inner cylinder 7 to l'=+l, it is possible to improve the silencing characteristics of the frequency component four times the frequency component. can.

In addition, since high-temperature combustion exhaust gas flows inside the heat exchanger 2, the heat exchanger wall surface is excited due to the collision of the hot air flow.
This causes new noise generation.

This can be prevented by increasing the rigidity of the heat exchanger wall surface, for example by making the heat exchanger spherical or partially spherical.

As explained above, the heat exchange device of the present invention not only solves the technical problems, but also provides a baffle body to form a ventilation path along the inner wall of the heat exchanger, so that the inside of the heat exchanger can be Since the flowing combustion exhaust gas flows along the inner wall surface of the heat exchanger, the heat exchange efficiency can be improved.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view of a heat exchange device according to an embodiment of the present invention, Fig. 2 is a sectional view of a conventional hot air heater, and Fig. 3 is a sectional view taken along the line AA' in Fig. 2. . 2...(-next) heat exchanger, 4...burner, 5...communication port, 6...exhaust pipe, 7
...Inner cylinder (baffle body), 7a...Closed end, 8...Air passage, 9...End face of heat exchanger.

Claims (2)

[Scope of utility model registration request] (1) A heat exchanger with a diffuse combustion burner arranged at one end and a communication port communicating with the exhaust pipe at the other end is installed inside the exterior body, and one end and the other end of the heat exchanger are installed. A heat exchange device in which a baffle body is provided in between, and a ventilation path is formed between the outer circumferential wall of the baffle body and the inner wall surface of the heat exchanger. (2) Scope of Utility Model Registration Claim 1 where the length l between the baffle body and the other end of the heat exchanger is the wavelength of the frequency to be muted
Heat exchange device as described in section.