JPH09203506A - Petroleum spray combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a long-life, compact, and inexpensive petroleum spray combustion equipment by preventing flame from hitting against the inwall of a heat exchanging can without collapsing the requisites for compactification of a device. SOLUTION: In this petroleum spray combustion equipment, a combustion cylinder 31 is arranged at the upper part within a heat exchanging can 3 rectangular in horizontal cross section, and a petroleum spray nozzle 21 is arranged to face inside of the combustion cylinder 31 from above, and a coaxial air cylinder 32 is provided outside the combustion cylinder 31, and petroleum fuel is injected downward into the combustion cylinder 31, and air is introduced into the combustion cylinder 31 together with spray fuel from around the petroleum spray nozzle 21, and also it is introduced into the combustion cylinder 31 through a secondary air port 36 provided at the side peripheral wall of the combustion cylinder 31 from the air cylinder 32, and the flame generated in the combustion cylinder 31 is made to spread into the heat exchanging can 3 positioned further below from the opening 37 at the bottom of the combustion cylinder. Then, to the opening 37 at the bottom of the combustion cylinder being the outlet of the flame, a pair of air outlets E for narrowing flame are made to face it, in opposition from both sides which become the lateral direction Y of the rectangular heat exchanging can 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a petroleum spray combustion device that can be used as a part of a water heater.

[0002]

2. Description of the Related Art An example of a conventional oil spray combustion device 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 the lateral direction. FIG. 6 (B) is a longitudinal cross-sectional configuration diagram 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 body, 4 is an exhaust collecting cylinder, and 5 is an exhaust cylinder part which also functions as a silencer. In the burner unit 2, combustion is performed by the supplied petroleum fuel and the air from the blower 1, and the flame generated downward spreads into the heat exchange can body 3. Heat exchange can 3
A heat exchange water passage pipe 6 is wound around, and a part of the heat exchange water passage pipe 6a is provided as a finned heat exchange water passage pipe 6a penetrating the fins 7 in the lower space of the heat exchange can body 3. The heat exchange can body 3 is a rectangular parallelepiped whose horizontal cross section is rectangular due to the size of the device. Referring to FIGS. 6A and 6B, the burner unit 2 has a petroleum spray nozzle 21, an electromagnetic pump 22 that supplies petroleum fuel to the petroleum spray nozzle 21, and a supply amount of petroleum fuel. The control valve 23 and the like are provided. An air control tube 24 is provided on the outer periphery of the oil spray nozzle 21.
Is provided. A combustion cylinder 31 is provided in the center of the upper part of the heat exchange can body 3, and an air cylinder 32 is concentric with the combustion cylinder 31 outside the combustion cylinder 31.
Is provided. 33 is a dead air cylinder. A flame resistance plate 34 spreads the flame coming out of the combustion cylinder 31 into the heat exchange can body 3 in the longitudinal direction X in the heat exchange can body 3 and in the lateral direction Y.
This is to prevent it from spreading too much.

[0003]

However, in the above-mentioned conventional petroleum spray combustion device, since the fin combustion is performed by the downward combustion method, the heat insulating can body is constructed so that no heat insulating material is provided on the inner peripheral wall of the body plate. Moreover, since the horizontal cross section of the heat exchange can body 3 is rectangular, when the flame generated in the combustion cylinder 31 spreads from the lower end opening of the combustion cylinder 31 into the heat exchange can body 3, the flame is generated by the heat exchange can body 3. Of the inner peripheral walls 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 lateral direction Y, so that the wall surface 3a in the lateral direction Y easily becomes locally hot. There was a problem that the life was shortened. Further, even if the flame resistance plate 34 as described above is provided, it is not possible to sufficiently reduce the impact of the flame on the wall surface 3a in the lateral direction Y. On the other hand, if the entire heat exchange can body 3 is made larger, the number of flames hitting the wall surface 3a in the lateral direction Y is reduced, but it is not possible to satisfy the demand for downsizing the device, and the heat exchange can body 3 is There is a problem in that the inner space becomes large, and the number of through-hole heat exchange water pipes 6a with fins 6 and the size of the fins 7 need to be increased, resulting in high cost.

Therefore, 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 downsizing of the apparatus, thereby providing a long life, compact size and low cost. To provide a simple oil spray combustion device.

[0005]

In order to solve the above problems, a petroleum spray combustion apparatus according to the present invention has a combustion cylinder arranged in an upper part of a heat exchange can body having a rectangular horizontal cross section and heat generated in a lower space. A water passage pipe for exchange is arranged so as to penetrate, and an oil spray nozzle is arranged so as to face the combustion cylinder from above with respect to the combustion cylinder, and a concentric air cylinder is provided outside the combustion cylinder. The petroleum fuel is sprayed downward into the combustion cylinder, and the air sent from the blower is also introduced into the combustion cylinder together with the sprayed fuel from around the oil spray nozzle and from the air cylinder to the side of the combustion cylinder. Petroleum spray combustion in which the flame generated in the combustion cylinder is spread through the secondary air holes provided on the peripheral wall to spread from the lower end opening of the combustion cylinder into the heat exchange can body below. A device, wherein The pair of flame outlet air outlets are opposed to both sides of the combustion tube lower end opening, which is the flame outlet, in the lateral direction of the rectangular heat exchange can body. It is characterized by 1. Further, in the petroleum spray combustor of the present invention, in addition to the first feature, the pair of flame throttle air outlets is either an outward flange of the lower end of the combustion tube or an inward flange of the lower end of the air tube. A second feature is that a shallow stepped portion having a constant width is formed in the groove to form a horizontal slit-like gap in a non-bonded state that exists in a part of the bonded interface between the overlapped flanges.

According to the first feature of the present invention, the air is blown out from the pair of flame throttle air outlets facing each other from both sides in the lateral direction of the lower end opening of the combustion cylinder, whereby combustion is performed. The flame that spreads from the inside of the cylinder into the heat exchange can body is narrowed in the lateral direction at the opening of the lower end of the combustion cylinder that is the source of the flame, and as a result, the spread in the lateral direction in the heat exchange container is reduced. . This reduces the contact of the flame with the short-side wall surface of the heat exchange can body, and prevents the short-side wall surface from locally becoming hot. Also, since the flame throttle air outlets are limited to only two locations in the lateral direction, which is the minimum required, the amount of air used for flame throttle is suppressed below a certain level, and it is used for burning petroleum fuel. It does not occur that the amount of air to be blown is insufficient for the flame throttle. According to the second feature of the present invention, the pair of flame throttle air outlets are configured by utilizing the outward flange of the combustion cylinder and the inward flange of the air cylinder concentrically present outside thereof. Therefore, it is possible to easily and easily configure the air outlet for flame throttle with existing members without adding new members. Further, since the flame throttle air outlet has a horizontal slit shape, it is possible to efficiently throttle the flame with a small amount of air and a wide width in the horizontal direction. Therefore, the conditions of the amount of air and the air flow velocity introduced from the air cylinder into the combustion cylinder through the secondary air hole are not reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described below. FIG. 1 is an external view showing an example in which a petroleum spray combustion device showing an example of an embodiment of the present invention is used as a part of a water heater, and FIG. 2 is a sectional configuration diagram of a main part of the oil spray combustion device, (A) is a cross-sectional configuration diagram in the lateral direction of the oil spray combustion device, and (B) is a cross-sectional configuration diagram in the longitudinal direction of the oil spray combustion device. FIG. 3 is a detailed view of part (A) of FIG.
2 is a view of the vicinity of the combustion cylinder in FIG. 2 (A) seen from below, and FIG. 5 is a partial detailed view of FIG. 2 (B).

As described above, the petroleum spray combustion apparatus includes a blower 1, a burner section 2, a heat exchange can body 3, an exhaust collecting cylinder 4,
The heat exchange can body 3 is a rectangular parallelepiped whose horizontal cross section is rectangular due to the size of the equipment. Further, the burner unit 2 has an oil spray nozzle 21 and the oil spray nozzle 21.
An electromagnetic pump 22 for supplying petroleum fuel, a control valve 23 for controlling the amount of petroleum fuel supply, and the like are provided. An air control cylinder 24 is provided on the outer circumference of the petroleum spray nozzle 21. Further, a combustion cylinder 31 is provided at the center of the upper part of the heat exchange can body 3, and an air cylinder 32 concentric with the combustion cylinder 31 is provided outside the combustion cylinder 31. 33 is an invalid air cylinder, 34 is a flame resistance plate, and the flame resistance plate 34 spreads the flame coming out from the combustion cylinder 31 into the heat exchange can body 3 in the longitudinal direction X in the heat exchange can body 3, and the short side direction. This is to prevent it from spreading too much in Y. The above configuration is similar to that of the conventional device.

The flow rate of the petroleum fuel is controlled from the oil tank (not shown) by the electromagnetic pump 22 by the control valve 23, and enters the petroleum spray nozzle 21 arranged above the combustion cylinder 31 and facing the combustion cylinder 31. Further, it is sprayed downward from the nozzle 21 and is sprayed 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 is
It enters the burner unit 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 tube 24 is introduced from around the petroleum spray nozzle 21 into the combustion tube 31 together with the atomized fuel, and is used for combustion. Further, a swirling flow is introduced into the combustion cylinder 31 via the swirl vane portion 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 the secondary air holes 36 provided in the side peripheral wall of the combustion cylinder 31. The flame generated in the combustion cylinder 31 by the ignition by the igniter 25 spreads from the lower end opening 37 of the combustion cylinder 31 into the heat exchange can body 3 further below.

The lower end opening 37 of the combustion cylinder 31 serves as an outlet through which the flame generated in the combustion cylinder 31 spreads into the heat exchange can body 3. An outward flange 38 is formed on the peripheral edge of the lower end opening 37. On the other hand, an inward flange 39 is formed around the lower end of the air tube 32. The inward flange 39 is formed with 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 tube 32 so as to oppose the short-side 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 and the outward flange 38 of the combustion cylinder 31 forming a, the combustion cylinder 31 and the air cylinder 32 are closed in a closed state at the lower end side, and A non-joined horizontal slit-like gap is formed at the joining interface having the pair of stepped portions 39a, 39a, and this serves as a flame throttle air outlet E. That is, a pair of the flame outlet air outlets E are provided so as to oppose each other from both sides in the lateral direction Y of the periphery of the lower end opening portion 37 of the combustion cylinder 31, and the air outlets E are horizontally elongated slits. It becomes a state and is facing. The flame is throttled in the lateral direction Y by the horizontal airflow blown from both sides in the lateral direction Y at the lower end opening 37 of the combustion cylinder 31. As a result, the flame is effectively throttled in the lateral direction Y at the relatively proximal end side thereof, and the contact of the heat exchange can body 3 with the wall surface 3a in the lateral direction Y is reduced or prevented. That is, the short direction Y where the flame easily hits
The overheating of the wall surface 3a of the heat exchange can body 3 is reduced or prevented.

In the above example, the flame outlet air outlet E is formed at the joint interface between the flanges 38, 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 throttle 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 flame outlet air outlet E has a slit shape that is elongated in the horizontal direction in order to reduce the required air amount and to effectively throttle the flame in the lateral direction Y, but it is not always a horizontal slit shape. It need not be configured as a gap. Further, the flame outlet air outlet E is essentially the lower end opening 37 of the combustion tube 31.
On the other hand, it suffices that they are provided so as to face each other from both sides in the lateral direction Y, and it is not always necessary to use both flanges 38, 39.

[0012]

According to the present invention, there is provided the above construction.
According to the petroleum spray combustion device described in (1), a pair of flames are opposed to the combustion cylinder lower end opening that is the outlet of the flame from both sides in the lateral direction of the heat exchange can body having the rectangular shape. Since the air outlet for throttling is exposed, the flame that spreads from the inside of the combustion cylinder into the heat exchange can body below can be narrowed in the lateral direction at the opening at the bottom of the combustion cylinder, which is the origin of the flame. The contact with the short-side wall surface in the exchange can body is reduced, the short-side wall surface is prevented from being locally overheated, and the durability is kept compact without enlarging the device. Can be improved. Also, since the flame throttle air outlets are provided only at two locations in the lateral direction, which is the minimum required, the amount of air used for flame throttle can be limited to a certain amount or less, and It is possible to prevent shortage of the amount of air that should be used for combustion, and to perform well from high capacity combustion operation to low capacity combustion operation.
Further, according to the petroleum spray combustion device of the second aspect, in addition to the effect of the configuration of the first aspect, the pair of flame throttle air outlets includes the outward flange of the lower end opening of the combustion tube and the air tube. By forming a shallow stepped portion with a constant width on one of the inward flanges at the lower end, it was configured as a non-joined horizontal slit-like gap that exists at a part of the joining interface of both overlapped flanges. Therefore, it is possible to easily and easily configure the air outlet for flame throttle with existing members without adding new members. Further, since the flame throttle air outlet has a horizontal slit shape, it is possible to efficiently throttle the flame with a small amount of air and a wide width in the horizontal direction. Therefore, the conditions of the amount of air and the air flow velocity introduced from the air cylinder into the combustion cylinder through the secondary air hole are not reduced.

[Brief description of drawings]

FIG. 1 is an external view showing an example in which a petroleum spray combustion device showing an example of an embodiment of the present invention is used as a part of a water heater.

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

FIG. 3 is a partial detailed view of FIG. 2 (A).

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

5 is a partial detailed view of FIG. 2 (B).

FIG. 6 shows an example of a conventional oil spray combustion device, (A) is a cross-sectional configuration view in the lateral direction of the heat exchange can body part of the oil spray combustion device, and (B) is a heat exchange can of the oil spray combustion device. It is a longitudinal cross-sectional block diagram of a body part.

[Explanation of symbols]

 1 Blower 2 Burner 3 Heat Exchange Can 6 Heat Exchange Water Pipe 21 Oil Spray Nozzle 31 Combustion Cylinder 32 Empty Cylinder 36 Secondary Air Hole 37 Lower End Opening 38 Outer Flange 39 Inward Flange E Flamelet Outlet D step W Width X Longitudinal direction Y Short direction

Claims (2)

[Claims] 1. A combustion pipe is arranged in an upper portion of a heat exchange can body having a rectangular horizontal cross section, and a heat exchange water passage pipe is arranged in a lower space, and a petroleum spray nozzle is provided for the combustion pipe. Is placed facing the inside of the combustion cylinder from above and a concentric air cylinder is provided on the outside of the combustion cylinder, and the petroleum fuel is sprayed downward into the combustion cylinder by the petroleum spray nozzle,
Further, the air sent from the blower is introduced into the combustion cylinder together with the atomized fuel from around the petroleum atomization nozzle, and the air is burned from the air cylinder through the secondary air holes provided in the side peripheral wall of the combustion cylinder. A petroleum spray combustion device which is introduced into a cylinder so that a flame generated in the combustion cylinder is spread from a lower end opening of the combustion cylinder into a heat exchange can body below the combustion cylinder, which is an outlet of the flame. A petroleum spray combustion device, characterized in that a pair of flame throttle air outlets are opposed to the lower end opening from both sides in the lateral direction of the rectangular heat exchange can body. 2. A pair of flame throttle air outlets are provided with a shallow stepped portion having a constant width on either the outward flange of the lower end opening of the combustion cylinder or the inward flange of the lower end of the air cylinder. The petroleum spray combustion device according to claim 1, wherein the petroleum spray combustion device is configured as a horizontal slit-shaped gap in a non-bonded state that exists in a part of a bonded interface between the overlapped flanges.