JP3228114B2 - Oil spray combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil spray combustion device which can be used as a part of a hot water supply device.

[0002]

2. Description of the Related Art An example of a conventional oil spray combustion apparatus will be described with reference to FIGS. FIG. 1 is an external view showing an example in which an oil spray combustion device is used as a part of a hot water supply device, and FIG. 6A is a cross-sectional configuration of a heat exchange can body portion of a conventional oil spray combustion device in a lateral direction. FIG. 6B is a longitudinal cross-sectional view of the heat exchange can body of the conventional oil spray combustion device. In FIG. 1, 1 is a blower, 2 is a burner part, 3 is a heat exchange can, 4 is an exhaust collecting cylinder, and 5 is an exhaust cylinder part also serving as a muffler. In the burner section 2, combustion is performed by the supplied petroleum fuel and air from the blower 1, and the flame generated downward spreads into the heat exchange can 3. Heat exchange can 3
A water exchange pipe 6 for heat exchange is wound around, and a part thereof is disposed as a finned heat exchange water pipe 6a through the fins 7 in the lower space in the heat exchange can body 3. The heat exchange can 3 is formed of a rectangular parallelepiped whose horizontal cross section is rectangular in view of the dimensions of the fixture. Referring to FIGS. 6A and 6B, the burner unit 2 has an oil spray nozzle 21, an electromagnetic pump 22 for supplying oil fuel to the oil spray nozzle 21, and a control unit for controlling the amount of oil fuel supplied. Are provided. An air control cylinder 24 is provided around the outer periphery of the oil spray nozzle 21.
Is provided. A combustion cylinder 31 is provided in the upper center of the heat exchange can 3, and a concentric air cylinder 32 is provided outside the combustion cylinder 31.
Is provided. 33 is an invalid air cylinder. Numeral 34 denotes a flame resistance plate which spreads the flame coming out of the combustion tube 31 into the heat exchange can 3 in the longitudinal direction X in the heat exchange can 3 and in the short direction Y
This is to prevent it from spreading too much.

[0003]

However, in the above-mentioned conventional oil spray combustion apparatus, heat insulation is not provided on the inner peripheral wall of the body plate of the heat exchange can because of the fin-combustion in the downward combustion method. Further, since the horizontal section of the heat exchange can 3 is rectangular, when the flame generated in the combustion cylinder 31 spreads from the opening at the lower end of the combustion cylinder 31 into the heat exchange can 3, the flame is generated by the heat exchange can. Of the inner peripheral wall of the body 3, it is difficult to hit the wall surface 3b in the longitudinal direction X, but it is easy to hit the wall surface 3a in the short direction Y. Therefore, the wall surface 3a in the short direction Y is easily locally heated, There was a problem that the life was shortened. Further, even if the above-described flame resistance plate 34 is provided, it is not possible to sufficiently reduce the contact of the flame to the wall surface 3a in the short direction Y. On the other hand, if the entire heat exchange can body 3 is enlarged, the flame hit on the wall surface 3a in the short side direction Y is reduced, but the demand for compactness of the apparatus cannot be satisfied. The internal space becomes large, and the number of penetrating heat exchange water pipes 6a with fins and the size of the fins 7 need to be increased, resulting in a problem of high cost.

Accordingly, the present invention solves the above-mentioned problems of the conventional apparatus and prevents the flame from hitting the inner wall of the heat exchange can body without breaking the requirement for compactness of the apparatus, thereby achieving a long life, compactness and low cost. It is an object to provide a simple oil spray combustion device.

[0005]

In order to solve the above-mentioned problems, an oil-spray combustion apparatus according to the present invention has a combustion cylinder disposed in an upper portion of a heat exchange can having a rectangular horizontal section and a heat exchanger in a lower space. A water passage pipe for replacement is disposed through, and an oil spray nozzle is arranged facing the inside of the combustion cylinder from above with respect to the combustion cylinder, and a concentric air cylinder is provided outside the combustion cylinder. Petroleum fuel is sprayed downward into the combustion cylinder, and air sent from the blower is introduced into the combustion cylinder together with the sprayed fuel from around the oil spray nozzle, and the air cylinder is moved from the air cylinder to the side of the combustion cylinder. Petroleum spray combustion in which the flame generated in the combustion cylinder is introduced into the combustion cylinder through a secondary air hole provided in the peripheral wall, and thereby the flame generated in the combustion cylinder spreads further downward into the heat exchange can body. An apparatus, wherein said A pair of flame throttling air outlets faces the opposite sides of the short side of the rectangular heat exchange can body with respect to the combustion cylinder lower end opening, which is a flame outlet. This is one of the features. Further, in the oil spray combustor of the present invention, in addition to the first feature, the pair of flame throttle air outlets may be one of an outward flange at a lower end opening of the combustion cylinder and an inward flange at a lower end of the air cylinder. The second feature is that a shallow stepped portion having a constant width is formed in the non-joining horizontal slit-like gap existing at a part of the joining interface between the two overlapped flanges.

According to the first feature of the present invention, combustion is performed by blowing air from a pair of flame throttle air outlets facing each other from both sides in the short direction of the lower end opening of the combustion cylinder. The flame that spreads out of the cylinder into the lower heat exchange can is narrowed in the transverse direction at the lower end opening of the combustion cylinder that is the source of the flame, and as a result, the spread in the transverse direction is reduced in the heat exchange can. . As a result, the contact of the flame with the wall surface in the lateral direction of the heat exchange can is reduced, and the wall surface in the lateral direction is prevented from being locally heated. In addition, since the air outlet for flame throttle is provided only at the minimum two locations in the short direction, the amount of air used for flame throttle is suppressed to a certain level or less, and it is used for oil fuel combustion. There is no shortage of the amount of air to be taken for the flame throttling. Further, according to the second feature of the present invention, a pair of flame throttle air outlets is constituted by utilizing an outward flange of a combustion cylinder and an inward flange of an air cylinder concentrically present outside the combustion cylinder. Therefore, it is possible to easily and easily configure the air outlet for the flame throttle by using the existing member without adding a new member. Further, since the flame throttle air outlet is formed in a horizontal slit shape, the flame can be efficiently narrowed with a small amount of air and a wide width in the horizontal direction. Therefore, the condition of the amount of air introduced from the air cylinder through the secondary air hole into the combustion cylinder and the condition of the air flow rate are not reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. FIG. 1 is an external view showing an example of using an oil spray combustion device as an example of an embodiment of the present invention as a part of a hot water supply device, and FIG. 2 is a cross-sectional configuration diagram of a main part of the oil spray combustion device. (A) is a cross-sectional configuration diagram in the short direction of the oil spray combustion device, and (B) is a cross-sectional configuration diagram in the same direction of the oil spray combustion device. FIG. 3 is a partially detailed view of FIG.
2A is a view of the vicinity of the combustion cylinder in FIG. 2A as viewed from below, and FIG. 5 is a partial detailed view of FIG. 2B.

As described above, the oil spray combustion apparatus includes a blower 1, a burner 2, a heat exchange can 3, an exhaust manifold 4,
The heat exchange can body 3 is composed of a rectangular parallelepiped with a horizontal cross section of a rectangular shape due to the dimensions of the equipment, comprising an exhaust tube portion 5 also serving as a muffler and a water exchange pipe 6 for heat exchange. The burner section 2 has an oil spray nozzle 21 and the oil spray nozzle 21.
An electromagnetic pump 22 for supplying oil fuel to the fuel tank, a control valve 23 for controlling the supply amount of oil fuel, and the like are provided. An air control cylinder 24 is provided on the outer periphery of the oil spray nozzle 21. Further, a combustion cylinder 31 is provided at the upper center in the heat exchange can 3, and a concentric air cylinder 32 is provided outside the combustion cylinder 31. 33 is an ineffective air cylinder, 34 is a flame resistance plate, and the flame resistance plate 34 spreads the flame coming out of the combustion tube 31 into the heat exchange can 3 in the longitudinal direction X in the heat exchange can 3, This is for preventing the Y from spreading too much. The above configuration is the same as the conventional device.

The petroleum fuel flows from a petroleum tank (not shown) into a petroleum spray nozzle 21 disposed above the combustion cylinder 31 and facing the combustion cylinder 31 while its flow rate is controlled by a control valve 23 by an electromagnetic pump 22. Further, the fuel is sprayed downward from the nozzle 21, and is spray-introduced into the combustion cylinder 31 through a hole in the center of the ceiling of the combustion cylinder 31. On the other hand, the air sent from the blower 1
It enters the burner section 2 and is further introduced into the air control cylinder 24 and the air cylinder 32. Part of the air that has entered the air control cylinder 24 is introduced into the combustion cylinder 31 together with the spray fuel from around the oil spray nozzle 21 and is provided for combustion. In addition, the gas is introduced into the combustion cylinder 31 as a swirling flow via a swirling blade 35 provided on the ceiling of the combustion cylinder 31. Further, a part of the air that has entered the air cylinder 32 is introduced into the combustion cylinder 31 through a secondary air hole 36 provided in the side peripheral wall of the combustion cylinder 31. The flame generated in the combustion cylinder 31 by the ignition of the igniter 25 spreads from the lower end opening 37 of the combustion cylinder 31 into the heat exchange can 3 further below.

The lower end opening 37 of the combustion tube 31 is an outlet from which the flame generated in the combustion tube 31 spreads into the heat exchange can 3. An outward flange 38 is formed at the periphery of the lower end opening 37. On the other hand, an inward flange 39 is formed on the periphery of the lower end of the air cylinder 32. The inward flange 39 has a pair of stepped portions 39a, 39a. The pair of stepped portions 39a, 39a are provided around the center of the lower end opening of the air cylinder 32 in the short direction Y. Each of the pair of stepped portions 39a has a constant width W and a shallow step D.
Have. As described above, the pair of stepped portions 39a, 39
By overlapping and joining the inward flange 39 of the air cylinder 32 forming the a and the outward flange 38 of the combustion cylinder 31 to close the combustion cylinder 31 and the air cylinder 32 in a closed state at the lower end side, A non-joined horizontal slit-shaped gap is formed at the joint interface having the pair of stepped portions 39a, 39a, and this is used as a flame throttle air outlet E. That is, a pair of the flame throttle air outlets E are formed so as to oppose from both sides in the short direction Y around the lower end opening 37 of the combustion cylinder 31, and the slits whose air outlets E are elongated in the horizontal direction are elongated. It is in a shape and is facing. The flame is narrowed in the short direction Y by the horizontal airflow blown from both sides in the short direction Y at the lower end opening 37 of the combustion tube 31. Thus, the flame is effectively narrowed in the short direction Y on the relatively proximal side thereof, and the contact of the heat exchange can 3 with the wall surface 3a in the short direction Y is reduced or prevented. That is, the short direction Y to which the flame easily hits
Overheating of the wall surface 3a of the heat exchange can 3 is reduced or prevented.

In the above example, the flame throttle air outlet E is formed at the joint interface between the flanges 38 and 39 by forming the stepped portion 39a on the inward flange 39 of the air cylinder 32. Instead of forming the stepped portion 39a on the 32 side, the flame outlet air outlet E may be provided by forming a stepped portion on the outward flange 38 of the combustion cylinder 31. Further, it is preferable that the air outlet E for the flame throttle is formed in a slit shape which is elongated in the horizontal direction in order to reduce the required amount of air and effectively narrow the flame in the short direction Y. It need not be configured as a gap. In addition, the air outlet E for flame throttle is, in short, a lower end opening 37 of the combustion cylinder 31.
It is only necessary to provide a pair as seen from both sides in the lateral direction Y, and it is not always necessary to use both flanges 38 and 39.

[0012]

According to the present invention, there is provided the above construction.
According to the petroleum spray combustion device described in the above, a pair of flames are opposed to both sides in the short direction of the heat exchange can body having the rectangular shape, with respect to the opening of the lower end of the combustion cylinder, which is the outlet of the flame. Since the air outlet for throttling is exposed, the flame spreading from the inside of the combustion cylinder to the lower heat exchange can can be narrowed in the transverse direction at the bottom opening of the combustion cylinder, which is the source of the flame. It reduces contact with the short-side wall surface inside the exchange can body, prevents the short-side wall surface from being overheated locally, and reduces the durability of the device without increasing the size of the device. Can be improved. In addition, since the air outlet for flame throttle is limited to only two places in the shortest direction required at the minimum, the amount of air used for flame throttle can be limited to a certain level or less, and the amount of oil fuel can be reduced. The shortage of the amount of air to be used for combustion can be prevented, and the high-performance combustion operation to the low-performance combustion operation can be performed satisfactorily.
According to the oil spray combustion device of the second aspect, in addition to the effect of the configuration of the first aspect, in addition to the effects of the configuration of the first aspect, the pair of flame throttling air outlets is provided between the outward flange of the lower end opening of the combustion cylinder and the air cylinder. By forming a shallow stepped portion with a constant width in any of the inward flanges at the lower end portion, it was configured as a horizontal slit-like gap in a non-joined state existing at a part of the joined interface of both superimposed flanges. Therefore, it is possible to easily and easily configure the air outlet for the flame throttle by using the existing member without adding a new member. Further, since the flame throttle air outlet is formed in a horizontal slit shape, the flame can be efficiently narrowed with a small amount of air and a wide width in the horizontal direction. Therefore, the condition of the amount of air introduced from the air cylinder through the secondary air hole into the combustion cylinder and the condition of the air flow rate are not reduced.

[Brief description of the drawings]

FIG. 1 is an external view showing an example in which an oil spray combustion device according to an embodiment of the present invention is used as a part of a hot water supply device.

FIG. 2 is a sectional configuration view of a main part of the oil spray combustion device,
(A) is a cross-sectional configuration view in the lateral direction of the oil spray combustion device,
(B) is a longitudinal section view of the same oil spray combustion apparatus.

FIG. 3 is a partial detailed view of FIG.

FIG. 4 is a view of the vicinity of the combustion cylinder of FIG. 2A viewed from below.

FIG. 5 is a partial detailed view of FIG.

6A and 6B show an example of a conventional oil spray combustion apparatus, in which FIG. 6A is a cross-sectional view of a heat exchange can body of the oil spray combustion apparatus in a lateral direction, and FIG. It is a longitudinal section sectional view of a body part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blower 2 Burner part 3 Heat exchange can body 6 Water exchange pipe for heat exchange 21 Oil spray nozzle 31 Combustion cylinder 32 Air cylinder 36 Secondary air hole 37 Lower opening 38 Outward flange 39 Inward flange E Flame outlet D stage W width X longitudinal direction Y transverse direction

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23D 11/24 F23D 11/02

Claims (2)

(57) [Claims] 1. A combustion tube is disposed in an upper portion of a heat exchange can having a rectangular horizontal section, and a water exchange pipe for heat exchange is disposed in a lower space, and an oil spray nozzle is provided for the combustion tube. A concentric air cylinder is provided on the outside of the combustion cylinder while disposing it facing the inside of the combustion cylinder from above, and the petroleum fuel is sprayed downward into the combustion cylinder by the oil spray nozzle,
Further, the air sent from the blower is introduced into the combustion cylinder together with the spray fuel from around the oil spray nozzle, and the air is burned from the air cylinder through the secondary air hole provided on the side peripheral wall of the combustion cylinder. A petroleum spray combustion device in which a flame introduced into a cylinder and thereby spreads a flame generated in the combustion cylinder from a lower end opening of the combustion cylinder into a heat exchange can body further below, wherein the combustion cylinder is an outlet of the flame. A petroleum spray combustion device characterized in that a pair of flame throttle air outlets face the lower end opening from both sides of the rectangular heat exchange can body in the short direction. 2. A pair of flame throttle air outlets are formed by forming a shallow stepped portion having a constant width in one of an outward flange at a lower end opening of a combustion cylinder and an inward flange at a lower end of an air cylinder. The petroleum spray combustion device according to claim 1, characterized in that it is configured as a non-joined horizontal slit-like gap existing at a part of the joined interface between the two overlapped flanges.