JPH0429334Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a hot air heater that exchanges heat between combustion air and heated air using a combustion chamber and a heat exchanger connected to the combustion chamber.

(Prior Art) There are two types of hot air heaters that are known as the hot air heaters described above, as disclosed in Japanese Utility Model Publication No. 1984-41755 and Japanese Utility Model Publication No. 58-42758. In order to improve the shape of the combustion chamber, a standpipe heat exchanger is attached above the combustion chamber, and a flat tube structure is used to improve flow on the wind side and heat transfer performance on the gas side. In addition to inserting a full plate, etc., a wind direction plate was also attached.

On the other hand, the latter has a structure in which panel heat exchangers are arranged vertically in parallel in the front and back.

(Problems to be solved by the invention) First of all, the former example of such conventional heating machines has problems such as increased cost due to flattening of the pipes, insertion of a full plate, and increased internal resistance due to the installation of a wind direction plate. The problem is that it prevents generalization,
On the other hand, in the latter example, simply applying airflow to the heat exchanger results in an average Since only air was used, local heating was likely to occur, which caused problems with durability.

The present invention was developed in view of the fact that conventional heat exchangers have various problems that need to be solved, and in particular improves the structure and arrangement of air-to-air heat exchangers. In particular, it is an object of the invention to combine the advantages of a compact structure with operational economy due to improved heat exchange efficiency.

(Means for solving the problem) However, in order to achieve the above purpose, the present invention
A combustion chamber 1 having a burner 10 and a heat exchanger 3 connected to the combustion chamber 1 and disposed above the combustion chamber 1 on the downstream side of the air flow
In the hot air heater which is housed in a casing 5, the heat exchanger 3 is constituted by a plurality of panel heat exchangers arranged in front and behind each other with their plate surfaces parallel to each other at a predetermined interval, The connection ports at the top of each heat exchanger are aligned horizontally, and the connection ports at the bottom of each unit are located at the same and opposite positions in the left and right distribution. The panel heat exchangers are arranged in an inverted V-shape with diagonal arrangement arranged alternately, and the panel heat exchangers are connected to each other so as to form a fluid flow path in which diagonal upward flow and diagonal downward flow are alternately continuous. It is characterized by being forced.

(Function) In the present invention, the heat exchanger 3 is arranged in an inverted V-shape that can diagonally intersect with the vertical upward airflow on the air side, so that it converges the airflow and makes contact with the airflow. As the time becomes longer, it is possible to maintain a high heat exchange rate by also serving as a wind direction plate.

Furthermore, since the combustion exhaust gas in the heat exchanger 3 contacts the air flow in a diagonal crossing with parallel flow and counterflow, the heat exchange efficiency can be further improved.

(Example) Hereinafter, one example of the present invention will be described based on the accompanying drawings.

FIG. 2 shows a hot air heater according to an embodiment of the present invention, in which a vertically long stationary casing 5 is provided with a suction grill 6 at the lower front and an outlet grill 7 at the upper front. Divided into rooms, the lower room has 8 convection fans, 9 oil levelers, and 1 burner.
The upper chamber houses a combustion chamber 1 facing the flame port of the burner 10, both first and second heat exchangers 2,
When the convection fan 8 is driven, air is sucked in from the suction grill 6, and the air, which has been removed by the air filter 12, is sent to the convection fan 8, around the burner 10, and in the combustion chamber 1. The air passes through the surrounding area and around the first and second heat exchangers 2 and 3 in order, and is then blown out from the blow-off grille 7. It is heated and blown out as warm air.

In the burner 10, an oil reservoir is connected to the outlet of the oil leveler 9, and an air supply pipe 13 extending from an air supply/exhaust pipe 14 is connected to the air supply port, and outdoor air is supplied as combustion air. Kerosene in an outdoor tank (not shown) is supplied as fuel via an oil leveler 9.

On the other hand, the combustion chamber 1 is provided with an outlet at the upper part of the back wall for sending combustion gas, a first heat exchanger 2 is connected to this outlet, and a second heat exchanger is connected to the outlet side of the first heat exchanger 2. The exchanger 3 is connected, and the outlet of the second heat exchanger 3 is connected to the supply/exhaust pipe 14 via the exhaust pipe 15, so that all the exhaust gas after combustion is exhausted outside without flowing into the room. Thus, a so-called clean combustion, exhaust-type heater that does not contaminate indoor air with combustion air can be obtained.

In the heater having such a configuration, the first heat exchanger 2
consists of a single panel heat exchanger with a flat and oval shape, and the connection port provided in the center of one end of the long diameter side is connected to the connection port that opens at the top of the combustion chamber 1, and the connection port is connected to the short cylinder. 4, and the panel heat exchanger is installed in an oblique manner with its major axis inclined with respect to the horizontal, and the connection port provided at the center of the other end of the major axis is connected to the It is directly connected to the connection port provided in the same manner on the exchanger 3.

On the other hand, the second heat exchanger 3 is composed of a plurality of panel heat exchangers forming the first heat exchanger 2, and as is clear from FIGS. 1 and 2, for example, Six panel heat exchangers are arranged side by side at a predetermined interval so that the plate surfaces serving as heat transfer surfaces are parallel, and each connection port is provided at the center of the upper end (other end) of the longer diameter side. Arranged approximately in a horizontal line, on the other hand, 2 pieces, 2 pieces, 1 piece, 1 from the upstream side near the first heat exchanger 2
The connection ports provided at the center of the lower end (one end) of each division unit are arranged diagonally as shown in the right or left position in Figure 2, and the overall shape is an inverted V-shape. It's set.

And for the connection ports facing each other, the short tube 4
By connecting the heat exchangers 3 through , a heat exchanger 3 is formed which has an inverted V shape and has internal fluid passages communicating with each other.

The arrangement and connection form of the second heat exchanger 3 described above is summarized as follows.In other words, each panel heat exchanger has connection ports at the upper end in approximately a horizontal line. Match, one, one or two adjacent
For units of 1 or more units, the connection ports at the bottom end of each unit are arranged in an inverted V-shape diagonally, with the connection ports located alternately in the same position and in the opposite position of the left and right distribution. The requirement is that the panel heat exchangers are connected to each other so as to form a fluid flow path in which diagonal upward flow and diagonal downward flow are alternately continuous.

To explain the operation of the heater configured as described above, especially the flow state of the combustion exhaust gas, the exhaust gas after being combusted in the combustion chamber 1 passes through the outlet and is transferred to the first heat exchanger 2.
After flowing into the interior, changing direction by 90 degrees and spreading turbulently,
It flows upward in the first heat exchanger 2 and is sent to the second heat exchanger 3.

In the process of this flow, the turbulent diffusion point, that is, the vicinity of the connection between the combustion chamber 1 and the first heat exchanger 2, improves heat transfer and becomes high temperature. The combustion exhaust gas generated in the combustion chamber 1 gathers at the connection port provided at the upper center of the chamber wall and flows mainly through the high temperature part of the connection part of the first heat exchanger 2, so heat exchange is efficient. Therefore, abnormal temperature rise can be suppressed.

The exhaust gas that has flown in the first heat exchanger 2 in this way flows into the second heat exchanger 3, but since this exhaust gas flows alternately in diagonal upward flow and oblique downward flow, the surrounding to-be-heated air The heat exchange efficiency is improved by performing cross-current and cross-counter flow.

The exhaust gas flowing through the second heat exchanger 3 is discharged outdoors through the exhaust pipe 15 after its temperature is lowered.

(Effect of the invention) In the present invention, the heat exchanger 3 is arranged in an inverted V-shape in the flow path of the air to be heated, so it has the effect of concentrating the air flow, and as a result, the heat transfer to the air is increased. Therefore, heating efficiency can be improved.

Further, since the heat exchanger 3 itself performs the wind guiding function, it is possible to omit attached members for wind guiding such as a wind direction plate, and a simple and compact device can be provided.

Furthermore, since the combustion gas flowing in the heat exchanger 3 alternately repeats cross-counter flow and counter-current flow with respect to the flow of the heated air, the heat exchange efficiency is increased.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are an overall schematic structural diagram and a principal structural diagram of an embodiment of the present invention. 1... Combustion chamber, 3... Heat exchanger, 5... Casing, 10... Burner.

Claims (1)

[Scope of utility model registration request] A hot air heater comprising a combustion chamber 1 having a burner 10 and a heat exchanger 3 connected to the combustion chamber 1 and disposed above the combustion chamber 1 on the downstream side of the airflow, housed in a casing 5. , consisting of a plurality of panel heat exchangers arranged in parallel at a predetermined distance, with their plate surfaces parallel to each other, with the connection ports at the upper ends of each heat exchanger being aligned horizontally. , and one unit or two or more adjacent units are arranged in an inverted V-shape with the lower end connection ports of each unit being alternately located at the same position and the opposite position in the left and right distribution, and further, A hot air heater characterized in that panel heat exchangers are connected to each other so as to form a fluid flow path in which diagonal upward flow and diagonal downward flow are alternately continuous.