JPH0229401Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a burner used for various purposes. Nozzles are formed at both ends of the supply pipe to block both ends of the supply pipe and blow the combustion gas into the supply pipe. It relates to a burner attached to at least one side.

[Conventional technology]

Conventionally, in the above-mentioned burners, combustion gas is required to reach the inner part of the long supply pipe, which is far from the end of the nozzle. The nozzle for blowing the combustion gas was formed with only a jet port for spouting the combustion gas in the axial direction of the supply pipe (no literature available).

[The problem that the idea aims to solve]

However, due to the dynamic pressure of the combustion gas ejected in the axial direction of the supply pipe, combustion is ejected from the gas ejection ports on the side closer to the nozzle among the gas ejection ports distributed in the pipe axial direction. The amount of gas ejected from the gas outlet on the far side was small compared to the amount ejected from the gas outlet on the far side, and the combustion state sometimes became unstable due to the non-uniformity of the amount of gas ejected in the direction of the tube axis.

The purpose of this invention is to rationally improve the nozzle that blows combustion gas into the long supply pipe from its end, so that the gas jets from the gas jet ports distributed in the axial direction of the long supply pipe can be used. The aim is to equalize the amount of ejection.

[Means to solve the problem]

The characteristic structure of the burner according to the present invention is that a combustion gas blowing nozzle attached to the end of a long supply pipe has an ejection port that spouts combustion gas in the axial direction of the supply pipe, and a combustion gas blowing nozzle that is attached to the end of a long supply pipe. The present invention is characterized by the fact that a jet port is formed for jetting out gas in a direction substantially perpendicular to the pipe axis direction of the supply pipe, and its functions and effects are as follows.

[Effect]

In other words, the combustion gas ejected from the nozzle in the axial direction of the supply pipe reaches the deep part of the long supply pipe due to its ejection force, and is distributed in the axial direction of the long supply pipe. The gas is ejected from the gas ejection port on the far side from the nozzle.

On the other hand, the combustion gas ejected from the nozzle in a direction substantially perpendicular to the axial direction of the supply pipe collides with the inner peripheral surface of the supply pipe or something equivalent to it.
Due to the collision, the ejection dynamic pressure of the combustion gas becomes static pressure, and as a result, the combustion gas is ejected from the gas ejection port on the side closer to the nozzle among the gas ejection ports distributed in the pipe axis direction of the long supply pipe. .

[Effect of idea]

As a result of the above actions, compared to the previous configuration in which the nozzle is equipped with only a jet port that jets combustion gas in the direction of the pipe axis and a predetermined amount of combustion gas is blown in, the influence of jet dynamic pressure is suppressed. The amount of gas ejected from the gas jet ports distributed in the axial direction of the tube could be made uniform in the axial direction of the tube, and as a result, the combustion state could be stabilized and the combustion performance of the burner could be improved.

By the way, to obtain the same effect as above, another method is to use a nozzle that has only a jetting port that jets combustion gas in the direction of the tube axis. By providing a full body that collides a part of the combustion gas,
The jetted combustion gas that does not collide with the buttful body is made to reach the deep part of the supply pipe by the jetting force and is jetted out from the gas jet port on the side far from the nozzle.On the other hand, the jetted combustion gas that collided with the buttful body is It is also conceivable that the ejection dynamic pressure is made static by the collision with the buffle body, and that the gas is ejected from the gas ejection port on the side closer to the nozzle.

However, with this alternative method, the number of parts increases because the buttful body is provided separately from the nozzle.
Therefore, the burner structure becomes complicated, leading to problems such as a decrease in burner production efficiency and an increase in production cost.

In this regard, the burner according to the present invention requires only an extremely simple improvement of forming two types of ejection ports with different ejection directions in the nozzle, and does not involve an increase in the number of parts. It also has an advantageous effect in terms of production compared to .

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

6 and 7 show a gas instantaneous water heater, 1
2 is a water tube type water heating heat exchanger, 2 is a burner, and 3 is a fan for supplying combustion air.

The heat exchanger 1 is housed in a combustion chamber forming casing 5 whose one end opening is connected to the exhaust port 4, and the combustion chamber forming casing 5 is formed into a cylindrical shape with a rectangular cross section. There is.

The burner 2 is housed in a burner casing 6 having the same rectangular cross-sectional shape, and the combustion chamber-forming casing 5 and the burner casing 6 are joined by a flange.

The fan connection side portion of the burner casing 6 is formed into a hopper type wind guide 6A, and the fan 3 is connected to the inlet side opening of the hopper type wind guide 6A.
Burner casing 6
and the fan casing 3A are connected.

Fan 3 uses a cross-flow fan,
With respect to the cylindrical shape having a rectangular cross section extending from the combustion chamber forming casing 5 to the burner casing 6, the cross-flow fan 3 is designed so that almost the entire cross-flow fan 3 is accommodated in the virtual extension of the cylindrical shape, and the cylindrical shape is The cross-flow fan 3 is arranged so that the fan rotation axis P is oriented in the long side direction of the rectangular cross-sectional shape.

That is, by using a cross-flow fan as the fan 3 and arranging the cross-flow fan 3 as described above, the water heater is made thinner.

In addition, since the cross-flow fan 3 is provided with a slit-shaped discharge port that covers almost the entire width of the burner casing 6 in the direction of its rotation axis P, the hopper-type wind guide 6A has a rectangular cross section in the cylindrical shape. It has a hopper shape in which the air passage width increases only in the short side direction (thickness direction of the water heater).

At the outlet side opening and the inlet side opening of the hopper type wind guide 6A, punching plates 7 and 8 for regulating the air are stretched over the entire surface of each opening, and the fan casing From the tongue part 3a of the fan casing 3A, a guide tongue piece 9 with an inclined posture that promotes dispersion of the air discharged from the fan 3 in the thickness direction of the water heater is connected over almost the entire width in the longitudinal direction of the fan casing 3A. It is set up.

In the figure, 10 is an exterior casing 11 of the water heater, which is an intake port for taking in air for combustion, and 12 is a motor for driving a fan.

Next, the specific structure of the burner 2 will be explained. In addition, hereinafter, the long side direction and the short side direction of the rectangular cross-sectional shape of the cylindrical shape are simply referred to as the long side direction and the short side direction, and the cylindrical axis direction of the cylindrical shape is simply referred to as the cylindrical axis direction. .

As shown in FIGS. 1 to 5, the burner casing 6 has a U-shaped portion 13a as a cross-sectional shape when viewed in the long side direction, and linear portions 13b as legs continuous to both ends of the U-shaped portion 13a. A plurality of bent partition plates 13 covering almost the entire width in the long side direction are installed in the burner casing 6 on the air conditioning punching plate 7 of the opening on the hopper type wind outlet side, respectively, in the short side direction of the burner casing 6. The space surrounded by the air conditioning punching plate 7 and the partition plate 13, which are arranged side by side over the entire width thereof, is defined as an air supply chamber a that receives the combustion air that has passed through the air conditioning punching plate 7.

Then, each of the partition plates 13 has a cross-sectional shape U
The fuel gas supply pipe 14 is disposed in the recess formed by the character-shaped portion 13a in a posture along the extending direction of the partition plate 13 and over almost the entire width in the long side direction of the burner casing 6. , partition plate 13
A fuel gas supply pipe 14 is connected to a group of 15 rows of gas ejection ports that eject fuel gas separately toward both side inclined wall surfaces 13c of each U-shaped section 13a.
In addition, a row of 16 groups of air ejection ports for ejecting combustion air from the air supply chamber a toward 15 groups of gas ejection ports is arranged on both inclined wall surfaces 13c of the partition plate 13.
Gas jet ports 15 and air jet ports 16 facing each other are formed so as to be alternately located in the long side direction (direction in which the partition plate extends).

In other words, the burner 2 is operated for combustion by using the side of the space partitioned by the partition plate 13 in the cylinder axis direction, where the U-shaped cross-sectional portion 13a opens, as the combustion section. Due to the staggered arrangement of the air jet ports 15 and air jet ports 16, as the fuel gas and combustion air are jetted out, a circulating flow is generated in the space located between the gas jet ports 15 and the air jet ports 16 that are adjacent to each other in the long side direction. This increases the mixing effect between the jetted fuel gas and the jetted combustion air, thereby improving combustion performance.

In addition to the air outlet 16, an auxiliary air outlet 17 having a smaller opening area is provided in the U-shaped portion 1 with a U-shaped cross section than the formation position of the air outlet 16.
3a, the air supply chambers a are arranged parallel to each other in the partition plate extension direction (longitudinal direction) with respect to both inclined wall surfaces 13c at half the pitch of the parallel arrangement pitch of the air jet ports 16. A portion of the supplied combustion air is also ejected from these auxiliary air ejection ports 17, thereby reducing the flame hole load and muffling combustion noise.

In the entire width of the partition plate 13 in the extending direction, the bottom surface of the recess formed by the U-shaped cross-sectional portion 13a and the outer peripheral surface of the fuel gas supply pipe 14 are connected to both inclined wall surfaces 1.
3c, which prevents the combustion flame from going around to the bottom side of the recess due to the negative pressure inside the recess due to the draft effect. The fuel gas supply pipe 14 and the partition plate 13 are prevented from being overheated due to wraparound, thereby improving thermal durability.

In addition, when viewed in the extending direction (long side direction) of the partition plate 13, the gas outlet 15 and the air outlet 16 are as follows.
A part of the air ejected from the bottom side end of the recess in the opening shape of the air ejection port 16 flows into the fuel gas supply pipe 14.
are arranged so that the air is blown onto a portion of the outer circumferential surface of the concave portion located closer to the bottom of the recess than the gas outlet 15, whereby a portion of the air is used as cooling air to prevent the above-mentioned overheating. It is designed to more effectively prevent heat and further improve thermal durability.

On the other hand, when the partition plate 13 is installed on the punching plate 7 of the hopper type wind outlet side opening, the edges of the straight portions 13b on both sides as legs in the M-shaped cross section are In addition to contacting the punching plate 7 over its width, the bottom of the U-shaped cross-sectional portion 13a is also brought into contact with the punching plate 7 over its entire width in the extending direction of the partition plate 13. The cross-sectional shape is formed, and the U
The contact between the bottom of the character-shaped portion 13a and the punching plate 7 creates an air supply chamber a for a group of 16 air outlets formed on one inclined wall surface 13c, and a chamber for a group of 16 air outlets formed on the other inclined wall surface 13c. By dividing the combustion air into two chambers, even if the entire combustion air passes through the punching plate 7 in a direction inclined in the short side direction with respect to the punching plate 7 due to the dynamic pressure of the fan discharge air, the combustion air is divided into two chambers. Combustion air is evenly distributed and supplied to each chamber, thereby equalizing the combustion state in the short side direction and improving combustion performance.

To supply fuel gas to each long fuel gas supply pipe 14, a nozzle 18 for blowing fuel gas into the inside of the fuel gas supply pipe 14 is connected to the fuel gas supply pipe 14.
It is attached to the opening at one end of the fuel gas supply pipe 14, and the opening at the other end of the fuel gas supply pipe 14 is closed with a blind member 19.

The blow nozzle 18 has a fuel gas supply pipe 1
4. A first jet port 1 that jets fuel gas in the direction of the pipe axis.
8a and a plurality of second ejection ports 18b that eject fuel gas in the radial direction of the fuel gas supply pipe 14. Although the fuel gas is made to reach the closed end of the long fuel gas supply pipe 14, due to the influence of the dynamic pressure, it is ejected from the gas jet port 15 on the side closer to the blow nozzle 18 in the pipe axial direction. The inconvenience that the amount of fuel gas ejected is smaller than the amount ejected from the gas ejection port 15 on the far side is solved by supplying the fuel gas in the radial direction from the second ejection port 18a. The fuel gas ejected from the arrayed gas ejection ports 15 is made uniform in the axial direction of the fuel gas supply pipe 14 to improve combustion performance.

Note that the second jet port 18b is connected to the fuel gas supply pipe 14.
Blow nozzle 1 at a pitch of 90° in the circumferential direction of
They are arranged in parallel on the circumferential surface of 8.

In the figure, reference numeral 20 denotes a support member that fixes the blow nozzle 18 in a state where it faces the opening on one end side of the fuel gas supply pipe 14. collides with the inner circumferential surface 20a of the formed nozzle storage hole,
Due to the collision, the jetting dynamic pressure from the second jetting port 18b becomes static pressure.

Further, the support member 20 also serves as a closing member for the opening of the fuel gas supply pipe 14 on the side where the blowing nozzle is attached. Note that a rubber gasket (not shown) is interposed between the outer circumferential surface of the open end of the fuel gas supply pipe 14 and the support member 20.

Regarding the parts assembly structure of the burner 2, the fuel gas supply pipe 1 is attached to the first burner casing forming wall 21 located on one end side in the extending direction (longitudinal direction) of the partition plate 13 in the burner casing 6.
4 into the burner casing 6 from the outside to the inside, and the second burner casing forming wall 23 located on the other end side in the extending direction of the partition plate 13 is provided with the assembly hole 22 for inserting the A through hole 24 is formed to allow the blind end of the fuel gas supply pipe 14 inserted through the hole 22 to protrude outside the burner casing 6, and on the other hand, the end of the fuel gas supply pipe 14 on the side connected to the blow nozzle 18 is provided with a through hole 24. A stopper 25 is attached that defines the insertion depth of the fuel gas supply pipe 14 into the assembly hole 22 by contacting the outer surface of the first burner casing forming wall 21.

In addition, the wind regulating punching plate 7 stretched over the opening on the hopper type wind outlet side is aligned with the burner 2 in the axial direction of the cylinder.
A first receiving fitting 27 equipped with a pair of first spring tongues 26 biased toward the side is disposed on the inner surface side of the first burner casing forming wall 21, and a pair of similar first spring tongues 26 are disposed on the inner side of the first burner casing forming wall 21. and a second spring tongue piece 28 that biases the partition plate 13 toward the first burner casing forming wall 21 in the long side direction. They are each attached to the burner casing 6 by connecting with screws 30.

Then, as an assembly procedure, the wind regulating punching plate 7 is housed in the burner casing 6 and received by the first spring tongue piece 26 of each of the first and second receiving fittings 27 and 29, and then the partition plate 13, respectively, the first burner casing forming wall 21 and the second burner casing forming wall 21.
It is installed on the wind regulating punching plate 7 while being inserted between the spring tongue piece 28.

Next, while pushing the partition plate 13 and the punching plate 7 for air conditioning into the back side of the burner casing 6 (that is, toward the hopper type wind guide 6A side in the cylinder axis direction) against the first spring tongue piece 26, Hole 2
2, each of the fuel gas supply pipes 14 has its blind end protruding from the through hole 24, and
The stopper 25 is the first burner casing forming wall 2
1 to a depth where it contacts the outer surface of the partition plate 1, thereby positioning each of the fuel gas supply pipes 14 in the recess of the U-shaped cross-sectional portion 13a of each partition plate 13.

In the above-mentioned assembled state, both ends have holes 2.
Fuel gas supply pipe 1 penetrating through 2 and 24
4 and the biasing action of the first spring tongue piece 26, the wind regulating punching plate 7 and the partition plate 13 are held and fixed in the cylinder axis direction, and the partition plate 13 is connected to the first burner casing forming wall. The partition plate is held and fixed in the extending direction (long side direction) by the receiving action of the inner surface of the partition plate 21 and the biasing action of the second spring tongue piece 28.

Further, the stopper 25 is brought into contact with the outer surface of the first burner casing forming wall 21, and the partition plate 1 is brought into contact with the inner surface of the first burner casing forming wall 21.
Due to the contact of the three end surfaces, both the fuel gas supply pipe 14 and the partition plate 13 are aligned in the partition plate extension direction (long side direction) with the first burner casing forming wall 21 as a reference.
Therefore, the gas jet ports 15 arranged in parallel on the fuel gas supply pipe 14 and the air jet ports 16 arranged in parallel on the partition plate 13 are arranged relative to each other in a predetermined staggered phase with extremely high accuracy.

In the figure, reference numeral 31 denotes a locking tongue piece integrally formed with the stopper 25, and the locking tongue piece 31 is a locking tongue piece formed on the first burner casing forming wall 21 when the fuel gas supply pipe 14 is inserted into the assembly hole 22. The locking tongue pieces 31 are engaged with the locking holes 32, and the engagement between the locking tongues 31 and the locking holes 32 defines the assembly phase of the fuel gas supply pipe 14 in the circumferential direction.

Further, a support member 20 for the blowing nozzle 18 is provided.
is also used as a retaining member for the fuel gas supply pipe 14, and by connecting the support member 20 to the burner casing 6 with screws, the support member 20
The fuel gas supply pipe 14 is prevented from coming off by contact with the open end of the fuel gas supply pipe 14.

[Another example]

Next, another embodiment of the present invention will be described.

In the nozzle 18 that blows fuel gas into the inside of the fuel gas supply pipe 14, there is a jet port 18a that jets the fuel gas in the axial direction of the fuel gas supply pipe 14, and a jet port 18a that jets the fuel gas in a direction that is substantially perpendicular to the pipe axial direction. The ratio of the ejection amount to the ejection port 18b is appropriately set depending on the type of fuel gas (natural gas, city gas, LP gas, etc.) and the specific shape of the fuel gas supply pipe 14.

Various improvements can be made in the specific formation structure for the nozzle 18 and the number of the jet ports 18b that jet the fuel gas in a direction substantially perpendicular to the tube axis direction.

The structure may be such that the fuel gas ejected in a direction substantially perpendicular to the tube axis collides with the inner circumferential surface of the fuel gas supply tube 14 itself.

Further, nozzles 18 having jet ports 18b that eject fuel gas in a direction substantially perpendicular to the axial direction of the fuel gas supply pipe 14 may be attached to both ends of the fuel gas supply pipe 14.

Further, although only the supply jet of fuel gas has been described above, the present invention can also be applied to the supply jet of combustion gas such as combustion air or a mixture of fuel gas and combustion air.

The burner according to the present invention can be applied to various uses other than water heaters.

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention,
FIG. 1 is a cross-sectional view of the burner, FIG. 2 is a vertical cross-sectional view of the burner, FIG. 3 is a cross-sectional view taken along the - line in FIG. 2, and FIG. 4 is a cross-sectional view taken along the - line in FIG. FIG. 5 is an exploded perspective view, FIG. 6 is a side sectional view of the water heater, and FIG. 7 is a front sectional view of the water heater. 14... Supply pipe, 15... Gas outlet, 18...
...Nozzle, 18a, 18b... spout.

Claims (1)

[Claims for Utility Model Registration] 1. A large number of gas outlets 15 for ejecting combustion gas are formed in a long supply pipe 14 and distributed in the axial direction of the pipe, and both ends of the supply pipe 14 are The burner is a burner in which a nozzle 18 for blowing the combustion gas into the supply pipe 14 is attached to at least one of both ends of the supply pipe 14. A jet port 18a that jets gas in the axial direction of the supply pipe 14, and a jet port 18a that jets the gas in the axial direction of the supply pipe 14;
The burner is formed with an ejection port 18b that ejects ejection in a direction substantially perpendicular to the tube axis direction of No. 4. 2. The burner according to claim 1, wherein the supply pipe 14 is a pipe that supplies fuel gas as the combustion gas. 3. The burner according to claim 1, wherein the supply pipe 14 is a pipe that supplies combustion air as the combustion gas. 4. The burner according to claim 1, wherein the supply pipe 14 is a pipe that supplies a mixture of fuel gas and combustion air as the combustion gas.