JPH11257654A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the generation of metallic sound, such as creaking sound, rubbing sound or the like, generated upon starting or shutting off combustion, by a method wherein a clamping device near the primary flame port unit of a burner main body is formed of a stepped bolt, penetrating through the bolt holes of a plurality of sheet members, and a nut so as to be capable of regulating a clamping torque. SOLUTION: A supporting sheet 23 is connected to the box sheet 29a of a combustion box near the primary flame port unit of a burner main body through a bolt 39 and a nut 41 (fastening device). The bolt 39 is constituted of a stepped part 39a and a screwed part 39b, to which the nut 41 is screwed, while the stepped part 39a of the stepped bolt 39 is penetrated through bolt holes formed on the supporting sheet 23 as well as the combustion box sheet 29a respectively and the length of the stepped part 39a of the stepped bolt 39 is slightly longer than the total sum of the thickness of the supporting sheet 23 and that of the box sheet 29a of the combustion box. The stepped part 39a of the stepped bolt 39 regulates a clamping torque and when the length of the stepped part 39a is formed so as to be equal to the total sum of respective thicknesses of the supporting sheet 23 and the combustion box sheet 29a, respective sheet members 23, 29a are contacted closely to each other under a condition that the clamping torque is set so as to be considerably low.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device used for a hot air heater such as a gas fan heater or an oil fan heater.

[0002]

2. Description of the Related Art Generally, a metal combustion box plate having a primary combustion chamber connected to a primary flame hole of a burner main body and a metal support plate supporting the burner main body are connected to the primary flame hole of the burner main body. Combustion devices are known which are connected via stops in the vicinity.

[0003]

In this type of material, the material repeatedly expands and contracts due to heat of combustion. In particular, if the plate located on the high temperature side is exposed to the heat of about 500 ° C. at the joint using the stopper near the primary flame hole, the plate located on the low temperature side receives heat of about 300 ° C. . Therefore, a temperature difference of about 200 ° C. occurs between the two, and a large difference occurs between the expansion amount and the contraction amount of the plate material located on the high temperature side and the plate material located on the low temperature side.

[0004] If a large difference occurs between the expansion amount and the contraction amount between the plate members, there is a problem that a metallic sound such as a squeaking sound or a rubbing sound is generated at the time of starting combustion or extinguishing a fire.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to suppress the generation of metallic noise such as squeaking noise and rubbing noise generated at the start of combustion of a combustion device or at the time of fire extinguishing. It is to provide a combustion device which can be used.

[0006]

According to the first aspect of the present invention,
In a combustion apparatus in which a plurality of plate members are overlapped and connected via a stopper near a primary flame hole of a burner main body, the stopper is tightened with a stepped bolt and a nut penetrating through bolt holes of the plurality of plate members. It is characterized in that the torque can be regulated.

According to the present invention, even if a large temperature difference is generated between the sheet materials on the high temperature side and the low temperature side, and the expansion amount and the contraction amount are different, the tightening torque between the plate materials is controlled by the stepped bolt and the nut. Is moderately regulated, so that the plate members are not displaced in a strongly coupled state, so that generation of metal noise such as squeaking noise or rubbing noise generated at the start of combustion or fire extinguishing of the combustion device is suppressed. .

According to a second aspect of the present invention, there is provided a combustion apparatus in which a plurality of plate members are overlapped and connected via a stopper near a primary flame hole of a burner main body. And a nut, and a spring member is interposed between the head of the bolt and the plate so that the fastening force between the plate members can be set.

According to the present invention, even when a large temperature difference is generated between the plate materials on the high temperature side and the low temperature side, and the expansion amount and the contraction amount are different, the fastening force between the plate materials is appropriately regulated by the spring member. Therefore, since the plate members are not displaced in a strongly coupled state, the generation of metal noise such as squeak noise and rubbing noise generated at the start of combustion of the combustion device or at the time of fire extinguishing is suppressed.

According to a third aspect of the present invention, in the first or second aspect, at least one of the bolt holes is formed by a long hole.

According to the present invention, since at least one of the bolt holes is formed by a long hole after the fastening force between the plate materials is appropriately regulated, even if the plate material expands and contracts, the plate material is at least in the long hole direction. Since movement is allowed, the generation of metallic noise such as squeaking noise and rubbing noise generated at the start of combustion or at the time of fire extinguishing is suppressed.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a hot air heater to which a combustion device according to the present invention is applied. The warm air heater 1 has a partition plate 5 inside the outer case 3, and is provided with a combustion device 7 and a blower 9 inside the partition plate 5. An air inlet 11 is formed on the back of the outer case 3, and a warm air outlet 13 is formed on the lower front.

During operation of the hot air heater 1, the air inlet 1
After the air sucked in from the combustion device 7 becomes primary air and secondary air in the combustion device 7 and is mixed with fuel and burned, the ventilation passage 15
And a part of the air is blown out from the hot air outlet 13 through the blower 9, and a part of the air passes through the ventilation passage 17 between the exterior case 3 and the partition plate 5 to cool the exterior case 3, and then the ventilation passage 1
The air is blown from the hot air outlet 13 through the blower 5 and the blower 9.

As shown in FIGS. 2 and 3, the combustion device 7 has a burner main body 21 composed of a Bunsen burner formed by connecting two metal plates. A flame hole plate 22 is fixed to the upper side of the burner main body 21 by spot welding.
A large number of slit-shaped flame holes 24 are formed in the flame hole plate 22 so as to be arranged in the longitudinal direction, whereby a primary flame hole portion 25 is formed. Further, the combustion device 7 includes a burner main body 21.
A metal combustion box 29 having a primary combustion chamber 27 connected to the primary flame hole 25 and a metal support plate 23 supporting the burner main body 21 are provided. A rectifying plate 31 is provided at the center of the combustion box 29, and the rectifying plate 31 is formed with an intermediate flame hole 33 that is opened in a horizontally long rectangular shape. The intermediate flame hole 33 is located between the primary flame hole 25 and the secondary flame hole 35 at the upper end of the combustion chamber 29, and has a width smaller than the width of the primary flame hole 25.

As shown in FIG. 3, the fuel injected from the nozzle 36 to the burner main body 21 sucks the surrounding air as primary air and, as shown in FIG. 2, becomes substantially uniform with the primary air for combustion. The mixture is ejected from each slit-shaped flame hole 24 of the flame hole plate 22 and mixed with the secondary air introduced into the primary combustion chamber 27 through the secondary air hole 38.

For example, when strong combustion is performed at about 3000 kcal / h, primary combustion is performed in the primary combustion chamber 27, and a large primary combustion flame is formed from the primary flame hole 25 to the intermediate flame hole 33. Combustion box 29 in secondary flame hole 35
Is performed using the air around the secondary air as secondary air, and a secondary combustion flame is formed on the secondary flame hole 35. In this case, if the primary combustion chamber 27 is extended upward, the primary combustion flame is formed vertically long, and the temperature of the primary combustion flame is reduced by that much, so that the generation amount of NOx is suppressed.

Further, for example, when the weak combustion is performed at about 550 kcal / h, the combustion is performed in a state where a small weak combustion flame is formed on the primary flame hole 25. In this case, the rectifying plate 31 is located above the flame plate 22,
Similarly, the excessive inflow of secondary air is suppressed,
The generation amount of x is suppressed.

In this embodiment, the support plate 23 and the combustion chamber 2
The nine box plates 29a are connected via bolts 39 and nuts 41 (stops) near the primary flame hole 25 of the burner body 21. This bolt 39 is, as shown in FIG.
It is stepped, and includes a step portion 39a and a screw portion 39b into which the nut 41 is screwed. The step portion 39a of the stepped bolt 39 passes through a bolt hole 42 formed in each of the support plate 23 and the combustion box plate 29a, and the length H of the step portion 39 is the thickness of the support plate 23 and the combustion box plate 29a. Are formed slightly larger or almost equal to the sum of.

The step portion 39a of the stepped bolt 39 is a portion for regulating the tightening torque, and the length H of the step portion 39 is substantially equal to the sum of the thicknesses of the support plate 23 and the combustion box plate 29a. If formed, the plate members 23 and 29a are brought into close contact with each other with the tightening torque set to be considerably small.

At this joint, as shown in FIG. 4, the support plate 23 is located on the high temperature side, and
Assuming that the combustion box plate 29a located on the low temperature side at the joint portion receives heat of about 300 ° C. Therefore, a temperature difference of about 200 ° C. is generated between the two, and a large difference occurs in the expansion amount and the contraction amount of the support plate 23 and the combustion box plate 29a at the joint.

In this embodiment, the fastening is formed by the stepped bolt 39 and the nut 41, so that the tightening torque is appropriately regulated. Therefore, the coupling force between the plate members 23 and 29a at the coupling portion is excessively large. It will not be. Therefore, even if a large difference occurs in the expansion amount and the contraction amount between the respective plate members 23 and 29a, the plate members 23 and 29a are not displaced in a strongly coupled state. Generation of metallic sounds such as creaking sounds and rubbing sounds is suppressed.

FIG. 5 shows another embodiment.

In this embodiment, the support plate 23 and the combustion box plate 29a are connected via a stepped bolt 49, a nut 51, and a spring member 53. This stepped bolt 49
Is composed of a step portion 49a and a screw portion 49b with which the nut 51 is screwed. Screw part 49 of this stepped bolt 49
In the state where the nut 51 is screwed into the b, the stepped bolt 49 is
A spring member 53 is interposed between the washer 55 of the head 49c and the combustion box plate 29a. The spring force of the spring member 53 defines the fastening force between the support plate 23 and the combustion box plate 29a. In this case, the fastening force is not more than the spring force of the spring member 53, and the fastening force does not become excessive. Therefore, even if a large difference occurs in the expansion amount and the contraction amount between the respective plate members 23 and 29a, the plate members 23 and 29a are not displaced in a strongly coupled state. Generation of metallic sounds such as creaking sounds and rubbing sounds is suppressed.

In the above two embodiments, it is desirable that at least one of the bolt holes 42 of the plurality of plate members 23, 29a is formed as a long hole, for example, as shown in FIG. According to this, between the plate materials 2
At least one of the bolt holes 42 is formed as a long hole after the bonding force of the third and 29a is appropriately regulated.
Even if 3, 29a expands and contracts, the plate members 23, 29
Since a is allowed to move at least in the longitudinal direction of the long hole 42, generation of metal noise such as squeaking noise or rubbing noise generated at the start of combustion or at the time of fire extinguishing is further suppressed.

In the above configuration, as shown in FIG. 7, a burner housing chamber 43 having a narrower front-rear width than the primary combustion chamber 27 is formed below the combustion chamber 29, and the burner main body 21 is housed in the burner housing chamber 43. The present invention can also be applied to the combustion device 7. In this case, the support plate 23 and the combustion box plate 29a are connected via the stepped bolt 39 in a state where the support plate 23 is bent and positioned inside the combustion box plate 29a.

The above configuration is not limited to the joint between the support plate 23 and the combustion box plate 29a. In addition, the present invention can be applied between all the plate materials connected via the stopper near the primary flame hole 25 of the burner body 21.

[0028]

According to the first aspect of the present invention, even when a large temperature difference occurs between the plate materials on the high temperature side and the low temperature side, and the difference in the expansion amount and the contraction amount occurs, the stepped bolt and the nut are used. Since the tightening torque between the plate members is appropriately regulated, the plate members are not displaced in a strongly coupled state, so that a metallic sound such as a squeaking sound or a rubbing sound generated at the start of combustion or fire extinguishing of the combustion device. Is suppressed.

According to the second aspect of the present invention, even when a large temperature difference is generated between the plate materials on the high temperature side and the low temperature side, and the expansion amount and the contraction amount are different, the fastening force between the plate materials is maintained by the spring member. Since it is moderately regulated, the plates are not displaced in a strongly coupled state, so that the generation of metallic sounds such as squeaking noise and rubbing noise generated at the start of combustion or fire extinguishing of the combustion device is suppressed.

According to the third aspect of the present invention, at least one of the bolt holes is formed by a long hole after the fastening force between the plate materials is appropriately regulated, so that even if the plate material expands and contracts,
Since the plate member is allowed to move at least in the direction of the long hole, the generation of metallic noise such as squeak noise and rubbing noise generated at the start of combustion or at the time of fire extinguishing is suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hot air heater.

FIG. 2 is a sectional view showing one embodiment of a combustion device according to the present invention.

FIG. 3 is a front view of the same.

FIG. 4 is a cross-sectional view of a coupling portion.

FIG. 5 is a cross-sectional view showing another embodiment.

FIG. 6 is a plan view showing a bolt hole.

FIG. 7 is a diagram corresponding to FIG. 2, showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot-air heater 3 Outer case 7 Combustion device 9 Blower 21 Burner main body 22 Flame plate 23 Support plate 25 Primary flame hole 27 Primary combustion chamber 29 Combustion box plate 29a Combustion box plate 39, 49 Stepped bolt 39a, 49a Step Part 39b, 49b Screw part 39c Head 41, 51 Nut 42 Bolt hole 53 Spring member

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Juichi Takada 1-1, Dainitsucho, Moriguchi-shi, Osaka Sanyo Electric Gas Equipment Co., Ltd. (72) Inventor Tetsuya Fujita 1-1, Dainitsuchicho, Moriguchi-shi, Osaka Sanyo Electric Gas Appliances Co., Ltd. (72) Inventor Koji Watanabe 1-1, Dainitsucho, Moriguchi-shi, Osaka Sanyo Electric Gas Appliances Co., Ltd. (72) Yoshiaki Kaneko, No. 1 Dainitsu-cho, Moriguchi-shi, Osaka No. 1 Sanyo Electric Gas Equipment Co., Ltd. (72) Inventor Teruaki Harada 1-1, Dainitomachi, Moriguchi-shi, Osaka Sanyo Electric Gas Equipment Co., Ltd.

Claims (3)

[Claims] 1. A combustion apparatus in which a plurality of plate members are overlapped and connected via a stopper near a primary flame hole of a burner main body, wherein the stopper has a stepped bolt passing through a bolt hole of the plurality of plate members. A combustion device characterized in that a tightening torque can be regulated by a nut and a nut. 2. A combustion apparatus in which a plurality of plates are overlapped and connected via a stopper near a primary flame hole of a burner main body, wherein the stopper is a bolt and a nut penetrating through bolt holes of the plurality of plates. And a spring member interposed between the head of the bolt and the plate member so as to set a fastening force between the plate members. 3. The combustion apparatus according to claim 1, wherein at least one of the bolt holes is formed by a long hole.