JPS63129246A - Small hot water supplier using petroleum fuel - Google Patents

Abstract

PURPOSE:To attempt to reduce the level of combustion noises and achieve high combustion efficiency by providing radially, in a water chamber, many smoke tubes which connect a combustion gas inversion chamber and smoke collecting chamber, and installing a gun type burner of secondary air supply type facing downwards at the upper section of a combustion chamber. CONSTITUTION:When a gun type burner 7 is operated, the flame facing downwards is formed in the longitudinal direction of the inside of a combustion chamber 2 from a fire door 7A. Since secondary air is supplied to the fire door 7A sufficiently, the flame is short so that the contact of the flame with the wall of the combustion chamber 2 is avoided and the flame flows uniformly downward along the wall. Then the flame hits the refractory material 13 of a combustion gas inversion chamber 4, and then is inverted through many smoke tubes 6 to be divided uniformly in those tubes. The combustion gas after finishing heat exchange is collected in the smoke collecting chamber 5 and passes through a combustion gas discharge box 8 and combustion gas discharge cylinder 9 and is discharged to outside. Generation of turbulent flow is, therefore, suppressed in the combustion chamber 2 and it becomes possible to reduce the level of combustion noises. Furthermore since the combustion gas flows without shifting on one side through the combustion chamber 2 and the many smoke tubes, it is possible to heat efficiently the water in a water chamber 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a small oil water heater suitable for downsizing and thinning.

(B) Conventional technology This type of small oil water heater is constructed by, for example, installing a smoke collection chamber and a combustion chamber above and below a chamber, and a large number of smoke pipes are arranged in the water chamber to connect the combustion chamber and the collection chamber. It is known that the burner is placed sideways on the side wall of the combustion chamber, and an exhaust pipe is connected to the smoke collection chamber.

In such a small oil water heater, when the burner is activated,
The flame hits the side wall of the combustion chamber and is redirected upward, and the combustion gases are exhausted through the flue, collection chamber, and stack. Then, the water in the water chamber is heated by exchanging heat with the combustion gas flowing through the combustion chamber and smoke pipe, and becomes hot water.

4. Problems to be solved by the invention The above-mentioned small oil water heater had the following problems.

■ Since the flame collides with the side wall of the combustion chamber, turbulence is promoted and the combustion noise is large.If the flame is thin and stone, the inner diameter of the combustion chamber will be about 200 m, and the volume of the combustion chamber will be reduced. Since it is small, the combustion noise is very loud.

■ Since the flame is formed in the circumferential direction of the combustion chamber, the combustion gas makes good contact with the heat transfer surface at the back of the combustion chamber when viewed from the burner, but the amount of heat exchange is small when the force is close to the burner, and the combustion The heat transfer surface of the chamber cannot be used effectively. Furthermore, an imbalance occurs in the amount of combustion gas passing through the smoke pipe, and the heat transfer surface does not act uniformly.

■ The number of smoke pipes increases to ensure the prescribed heat transfer area, and in order to connect the combustion chamber and smoke collection chamber, the inner diameter of the combustion chamber is 1.
It was difficult to make it 200+x or less.

■ It requires a muffling device to reduce combustion noise, a baffle plate to equalize the flow of combustion gas, and a fan with high static pressure, resulting in high costs.

This invention was made in view of the above facts,
The purpose is to reduce combustion noise, make effective use of the heat transfer surface to increase efficiency, and furthermore make the can body more compact and lower in cost.

B) Means for solving the problem In this invention, an annular water chamber is provided around a vertically long cylindrical combustion chamber, and a combustion gas inversion chamber communicating with the combustion chamber is provided below the combustion chamber and the water chamber. An annular smoke collection chamber is provided above the water chamber, a number of smoke pipes are arranged radially in the water chamber to connect the combustion gas inversion chamber and the smoke collection chamber, and a secondary air supply type gun is installed above the combustion chamber. It has a type burner facing downward and an exhaust pipe connected to the smoke collection chamber.

(E) Function With this configuration, flame is formed from the gun type burner downward in the longitudinal direction of the combustion chamber.

Also, since the gun-type burner uses a secondary air supply type, the flame is shortened. Therefore, the flame can be prevented from colliding with the wall of the combustion chamber, suppressing the generation of turbulence and reducing combustion noise. In addition, after the combustion gas uniformly flows downward along the wall of the combustion chamber, it is reversed upward in the combustion gas inversion chamber, and is evenly distributed and flows through a large number of smoke pipes, so heat transfer in the combustion chamber and smoke pipes is achieved. Space is effectively utilized without wastage, and high efficiency can be achieved. In addition, the combustion chamber is made into a vertically cylindrical shape, and a large number of smoke pipes are arranged radially in the annular water chamber, allowing the use of small-diameter combustion chambers and smoke pipes, making the water heater compact. can be made smaller and thinner. Furthermore, combustion noise is reduced, eliminating the need for a large-scale muffling device, and the flow of combustion gas is made uniform, eliminating the need for baffles. Furthermore, exhaust resistance is reduced and a high static pressure fan is no longer required, resulting in lower costs.

(f) Examples Hereinafter, this invention will be explained in detail based on examples shown in the drawings.

In Figures 1 and 2, 1 is a can body with a vertically elongated cylindrical combustion chamber 2 on the inside and an annular water chamber 3 around the combustion chamber 20. A combustion gas inversion chamber 4 communicating with the combustion chamber 2 is provided below, and an annular smoke collection chamber 5 is provided above the water chamber 3. Further, in the water chamber 3, a large number of smoke pipes 6 communicating between the combustion gas inversion chamber 4 and the smoke collection chamber 5 are arranged radially. Further, a secondary air supply type gun type burner T is placed in the upper part of the combustion chamber 2 and faces downward, and an exhaust pipe 9 is connected to the smoke collection chamber 5 via an exhaust box 8. The firing lower A of the gun type burner 7 has a bottomed cylindrical body 11 that integrates a stabilizer part 11A and a secondary air introduction part 11B having a large number of secondary air supply holes 12.
is provided.

Further, a refractory material 13 is disposed at the bottom of the combustion gas inversion chamber 4, and a heat insulating material 14 is attached to the inner walls of the smoke collection chamber 5, exhaust box 8, and exhaust pipe 9. Further, the water chamber 3 accommodates a heat exchange coil 15 that circulates and supplies bath water or heating water, and is also provided with a hot water supply port 16, a water supply port 17, and a drain port 18.

In the above-described small oil water heater, when the gun type burner T is operated, a flame is formed from the combustion lower A downward in the longitudinal direction within the combustion chamber 2. Further, since the combustion lower AK is sufficiently supplied with secondary air, the flame is shortened and contact with the wall of the combustion chamber 2 is prevented. The combustion gases flow uniformly downward along the walls of the combustion chamber 2. And the combustion gas inversion chamber 4
After hitting the refractory material 13 and being turned upward, it flows uniformly and dispersed into a large number of smoke pipes 6. The exhaust gas that has undergone heat exchange is collected in the smoke collection chamber 5, passes through the exhaust box 8 and the exhaust pipe 9, and is discharged to the outside.

According to this embodiment, since the flame can be prevented from coming into contact with the wall of the combustion chamber 2, the occurrence of turbulence in the combustion chamber 2 is suppressed,
Combustion noise can be reduced. In addition, since the combustion gas flows evenly through the combustion chamber 2 and the large number of smoke pipes 6, these heat transfer surfaces are effectively utilized, and the water in the water chamber 3 can be heated efficiently. The combustion chamber 2 is made into a vertically long cylindrical shape, and a large number of smoke pipes 6 are arranged radially in the annular water chamber 3.
It is also possible to make the heat transfer area sufficiently large while using a small-diameter smoke pipe 6, and the can body 1 can be made compact. For example, when the output is 30,000 km/h, the combustion chamber 2 can have an inner diameter of 100 to 150 mm, and the inner diameter of the combustion chamber can be set to 100 to 150 mm.
240mm), it can be significantly thinner. Furthermore, not only does it eliminate the need for large-scale muffling devices to reduce combustion noise or baffles to equalize the flow of combustion gas, but it also reduces exhaust resistance and eliminates the need for high static pressure fans. It can be constructed at low cost.

(G) Effects of the Invention Since the present invention is configured as described above, it is possible to suppress the generation of turbulent flow in the combustion chamber and reduce combustion noise, and also to reduce the heat transfer surface of the combustion chamber and smoke pipe. It can be used effectively to improve efficiency, and furthermore, the can body is compact, making it suitable for making water heaters smaller and thinner, and contributing to lower cost of water heaters.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a small petroleum water heater showing an embodiment of the present invention, and FIG. 2 is a sectional view of a portion taken along line A--A in FIG. 2... Combustion chamber, 3... Water chamber, 4... Combustion gas inversion chamber, 5... Smoke collection chamber, 6... Smoke pipe,
7...Gun type burner, 9...Exhaust pipe. Applicant: Sanyo Electric Co., Ltd. and 1 other agent: Patent attorney Takuji Nishino and 1 other person Figure 1 Cause 2

Claims (1)

[Claims] (1) An annular water chamber is provided around a vertically long cylindrical combustion chamber, a combustion gas inversion chamber communicating with the combustion chamber is provided below the combustion chamber and the water chamber, and an annular smoke collection chamber is provided above the water chamber. A large number of smoke pipes connecting the combustion gas inversion chamber and the smoke collection chamber are arranged radially in the water chamber, and a secondary air supply type gun type burner is placed in the upper part of the combustion chamber facing downward. A small oil water heater characterized by having an exhaust pipe connected to the smoke chamber.