JPH0356745Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a combustion device for forced air gas appliances for household use.

[Conventional technology]

If gas appliances such as bathtubs and water heaters use a forced air combustion method, it is possible to improve the heat absorption of the heat exchanger, expand the burner capacity, and at the same time reduce the size of the burner. As a result, the device can be designed to be thin and compact, which has the advantage of allowing the device to be installed in a small space, whether indoors or outdoors.

When a Bunsen gas burner is used as a forced air combustion method, the combustion air is divided into primary air and secondary air, and the primary air is flowed into the mixing tube at the same time as the gas discharged from the nozzle, and the secondary air is In order to achieve stable combustion, it is necessary to sufficiently rectify the secondary air to equalize the pressure. Generally, a method is used in which a pressure equalizing plate made of a porous member is installed in the secondary air blowing passage, and a method of using two pressure equalizing plates together has also been proposed to enhance the pressure equalizing effect.

[Problem that the invention attempts to solve]

Functionally, the pressure equalizing plate is installed at a position below the burner, but if two pressure equalizing plates are used and the distance between the first and second plate is small, the pressure equalizing effect will not be much different from using one plate. However, if an attempt is made to provide sufficient spacing, the height of the appliance will increase, which will negate the advantage of forced air gas appliances, which is that they can be manufactured in a compact size. In addition, since two pressure equalizing plates are used, unless the relationship between the burner and the pressure equalizing plates is arranged rationally, the structure becomes complicated and the manufacturing cost becomes high.

[Means for solving problems]

This idea aims to solve these problems by arranging multiple sheet metal burners in parallel at intervals and using a damper plate interposed in the air supply path to the burners. Combustion air is split into primary air and secondary air, forming a secondary air passageway that circulates below the burner and communicates upwardly along the side of the burner. Then, in the secondary air passage, install the first pressure equalizing plate below the burner, and install the second pressure equalizing plate at the rising part of the flame hole rising from the burner mixing pipe, and install the second pressure equalizing plate at the position below the burner. A combustion device for a household forced air gas appliance is constructed by sandwiching and laying the rising part of the flame hole.

[Effect]

Therefore, the primary air is supplied into the mixing tube of the burner at the same time as the gas, and the secondary air is completely rectified by the first pressure equalizing plate and the second pressure equalizing plate, and the secondary air is completely rectified by the first pressure equalizing plate and the second pressure equalizing plate. is supplied with equal pressure secondary air.

〔Example〕

The embodiments shown in the drawings will be specifically described below.

The drawing shows a forced-intake gas appliance for a household gas bath, with two burners 2 placed side by side inside the outer panel 10.
0 and a heat exchanger 30 is installed above the burner. The burner 20 is a general sheet metal burner made by symmetrically bulging a steel plate, bending it, and joining the edges. A flame hole rising portion 22 is formed from the mixing tube 21 in the state. An air supply passage 40 is provided passing through the lower part of the outer plate 10, and a blower fan 41 is installed upstream of the air supply passage 40, so that when combustion starts, combustion air is forcibly supplied to the air supply passage 40. be done. A damper plate 43 with openings 42 formed at appropriate positions in the air supply path 40
is installed to divide the combustion air into primary air and secondary air, and the damper plate 43 is installed to determine the optimum division ratio between primary air and secondary air according to the type of gas used. It will be done. The divided secondary air passage 44 goes around below the burner 20, and a first pressure equalizing plate 50 is installed in the secondary air passage 44 at a position below the burner 20, and is placed along the side of the burner 20. The secondary air passage 44 is formed so as to communicate upward, and a second pressure equalizing plate 51 is laid at the rising point of the flame hole rising portion 22 rising from the mixing pipe 21 of the burner 20, and the second pressure equalizing plate 51 is long. The three rectangular plates are provided so as to sandwich the flame hole rising portions 22 of the two burners 20, and both pressure equalizing plates 50 and 51 are formed by punching metal plates.

In such a forced air bathtub, the primary air flows into the mixing pipe 2 at the same time as the gas ejected from the nozzle 60.
1, the secondary air is branched by the damper plate 43, flows through the secondary air passage 44, and is supplied to the vicinity of the flame hole, and the combustion exhaust is discharged from the exhaust passage provided above the appliance to the outside of the appliance. It is configured to be discharged to

〔effect〕

The characteristic effects of this invention are as follows.

The first pressure equalizing plate 50 was installed below the burner 20, and the second pressure equalizing plate 51 was installed at the rising part of the flame hole rising part 22 of the burner 20.
It is permissible to increase the distance between both pressure equalizing plates 50 and 51, and the pressure of the secondary air can be completely equalized, and since only the first pressure equalizing plate 50 is provided below the burner 20, it is possible to increase the distance between the two pressure equalizing plates 50 and 51. It is no different from using a single pressure equalizing plate, and the height of the device can be reduced.

In addition, the second pressure equalizing plate 51 is attached to the rising part of the flame hole 2.
Since it was configured to be installed at the rising point of 2,
The pressure equalizing plate 51 is naturally supported by the bulging part of the mixing tube 21 and is stable, so it is easy to install, and the secondary air discharged from the pressure equalizing plate 51 is uniformly supplied along the side surface of the rising part 22 of the flame hole. Since the burner 20 and the two pressure equalizing plates 50 and 51 are arranged rationally, the structure is simple and can be manufactured at low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a front sectional view, FIG. 2 is a side sectional view, and FIG. 3 is a perspective view of a pressure equalizing plate. 20...burner, 22...flame hole rising part,
40... Air supply path, 43... Damper plate, 44...
Secondary air passage, 50... pressure equalization plate, 51... pressure equalization plate.

Claims (1)

[Scope of utility model registration request] A plurality of sheet metal burners are arranged side by side at intervals, and combustion air is divided into primary air and secondary air by a damper plate inserted in the air supply path to the burners, and the air circulates below the burners. to form a secondary air passage leading upward along the side of the burner, and in the secondary air passage, a first pressure equalizing plate is installed at a position below the burner, and the flame rising from the mixing tube of the burner is This is a combustion device for forced air gas appliances for domestic use, in which a second pressure equalizing plate is placed at the rising part of the rising part of each burner, sandwiching the rising part of the flame hole of each burner.