JPH10281417A - Gas burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a component cost and to decrease in size by integrally providing a mixing chamber together with a combustion chamber in a burner assembly, thereby simplifying constituting components and reducing number of components. SOLUTION: A front surface of a casing 9 of a gas burner 44 is opened, and this front surface opening 9a is openably closed by a cover 50. A burner assembly 16 is mounted on a rear surface of the cover 50, and when the cover 50 swings the burner casing opening 9a, the assembly 16 can be attached to or detached from the casing 9. The assembly 16 integrally has a mixing chamber 23 together with a combustion chamber 52. A combustion blower 47 is coupled at its gas outlet to a lower surface of the casing 9. And, a nozzle hole 12 is provided at an upper surface of the casing 9, and a fuel nozzle 2 communicating with a fuel supply unit is inserted into the hole 12. An end of the nozzle 2 is inserted into the assembly 16. Thus, a mounting space of the burner 44 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas burner used, for example, in a refrigerant heating / cooling machine.

[0002]

2. Description of the Related Art FIGS. 13A and 13B show a conventional gas burner used for a refrigerant heating type air conditioner. In the figure, reference numeral a denotes a mixing pipe which mixes gas ejected from the fuel nozzle b with primary air blown from the combustion blower c to obtain an air-fuel mixture. A burner head e is provided to face the mixture jet port d of the mixing tube a, and a burner plate f is further connected.

The mixing tube a and the burner plate f are
Here, they are integrally connected via a fixture (not shown) to form a burner assembly g. And this burner assembly g
Is housed in a burner casing h, and the combustion blower c is connected to a lower portion of the burner casing h.

[0004] A large number of flame holes i are provided on the side surface of the burner plate f, and a combustion chamber in which a lighting plug (not shown) is provided is formed in the inside, and these constitute a gas burner.

[0005] While the combustion air is blown from the combustion blower c, the fuel gas is ejected from the fuel nozzle b and mixed in the mixing pipe a. The air-fuel mixture generated in the mixing pipe a passes through the ejection port d, is rectified, and is supplied to the combustion chamber via the burner head e.

[0006] Secondary air is supplied to and mixed with the air-fuel mixture through the flame hole i. Then, the air-fuel mixture in the combustion chamber is ignited by the ignition plug and burns. That is, a combustion flame is formed in the burner plate f.

[0007]

The conventional gas burner is divided into two parts in the vertical direction, and the mixing pipe a and the burner plate f are connected by a screw as a fixing tool. Not only are there many, but they are structurally complex.

Further, since the mixing pipe a employs a structure in which the primary gas is sufficiently mixed with the fuel gas even when the inflow of the primary air is large, the blowing direction of the mixing pipe a becomes longer, and thus the apparatus becomes larger. Has been invited.

The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the number of parts by simplifying the constituent parts, thereby reducing the cost of parts and reducing the size and size. An object of the present invention is to provide a gas burner that can improve serviceability.

[0010]

According to a first aspect of the present invention, there is provided a gas burner having a tubular portion having a substantially C-shaped cross section and a fuel nozzle provided in the tubular portion. Chamber provided with a mixing pipe for introducing and mixing a part of the air supplied from the combustion blower with the fuel gas to be supplied, a burner head provided at an opening edge of the tubular portion, and On the downstream side of the burner head, a combustion chamber including a pair of burner plates extending integrally from the opening edge of the tubular portion and having a plurality of flame holes opened,
A burner assembly connecting the mixing chamber and the combustion chamber,
The burner assembly includes a burner casing that accommodates the burner assembly therein.

According to a second aspect of the present invention, in the gas burner according to the first aspect, an air-fuel mixture rectifying plate for rectifying the air-fuel mixture and leading the air-fuel mixture to the burner head is interposed between the mixing pipe and the burner head. .

According to a third aspect of the present invention, in the gas burner according to the first aspect, the burner assembly is formed by integrally molding the tubular portion forming the mixing chamber and the burner plate forming the combustion chamber. And

According to a fourth aspect of the present invention, in the gas burner according to the first aspect, the mixing pipe is a bottomed pipe body in which a fuel nozzle is inserted into an opening at one end and an opening at the other end is closed, and mixing is performed on a peripheral wall thereof. It is characterized by having an air-fuel mixture outlet for blowing air.

According to a fifth aspect of the present invention, in the gas burner according to the fourth aspect, the mixture outlet of the mixing tube is provided near the closed end and at a position not opposed to the opening formed in the tubular portion. It is characterized by being able to.

According to a sixth aspect of the present invention, in the gas burner according to the fourth aspect, the bottom portion of the mixing tube is formed of a lid closing an open end, and a flange portion is provided on the lid and extends outward. Is characterized in that the leading edge of the abutment contacts the inner wall surface of the tubular portion to support the end of the mixing tube.

According to a seventh aspect of the present invention, in the gas burner according to the second aspect, the air-fuel mixture rectifying plate includes a rectifying surface portion having a plurality of rectifying lattice-shaped communication holes, The burner head has a stepped portion interposed between the rectifying surface portion and the side surface portion. The tip portion of the side surface portion contacts the outer peripheral wall of the mixing pipe. It is characterized in that a convex portion is provided which is in contact with and forms a predetermined gap between the gas mixture straightening plate and the mixing pipe.

According to an eighth aspect of the present invention, in the gas burner according to the first aspect, secondary air is distributed to the outer surface of the connecting portion between the tubular portion and the burner plate as combustion air blown from the combustion blower. Air straightening plate is arranged,
This secondary air flow regulating plate is characterized in that it is locked to the inner wall surface of the burner casing.

According to a ninth aspect of the present invention, in the gas burner according to the first aspect, in the burner assembly, a fuel nozzle is arranged in an upper portion of the mixing chamber, a combustion blower is arranged in a lower part of the mixing chamber in a vertical series with each other, and the lower part of the combustion chamber is arranged. A spark plug is disposed on the first side.

According to a tenth aspect of the present invention, in the gas burner according to the third aspect, the tubular portion and the burner plate are formed with bent pieces along both side openings, and the bent pieces are connected to the bent pieces by caulking. The side plate provided with the piece closes both sides of the tubular portion and the burner plate, and a plurality of reinforcing projections are provided near the bent piece of the side plate.

According to an eleventh aspect of the present invention, in the gas burner according to the tenth aspect, the burner casing is provided with a groove that gradually narrows from an entrance side to an insertion side, and the bent piece of the side plate is inserted and engaged in the groove. The burner assembly is housed in a burner casing.

According to a twelfth aspect of the present invention, in the gas burner according to the tenth aspect, the burner casing is provided with a groove for inserting the bent piece of the burner plate into the inner wall surface and sealing the bent piece. Features.

According to a thirteenth aspect, in the gas burner according to the fourth aspect, the mixing pipe is provided with a straightening plate which is inclined in a predetermined length from an opening end on the fuel nozzle insertion side. And

According to a fourteenth aspect, in the gas burner according to the tenth aspect, the air sent from the combustion blower is uniformly distributed to the burner plates on both sides of the side plate on the side facing the combustion blower and provided on the burner plate. A wind regulating plate having a mountain-shaped cross section is provided to supply and guide the flame holes to be formed.

By adopting the means for solving the above problems, according to the first aspect of the present invention, the constituent parts can be simplified, the number of parts and the cost of parts can be reduced, and the size and size can be reduced. Serviceability is improved.

According to the second aspect of the present invention, the supply of air-fuel mixture from the mixing chamber to the combustion chamber can be made uniform, and the combustion efficiency can be improved. According to the third aspect of the present invention, by integrally forming the tubular portion accommodating the mixing tube and the burner plate forming the combustion chamber, the mixed state of the fuel gas and the primary air can be made equal to that of the conventional burner. .

According to the fourth aspect of the present invention, the primary air ratio at the time of optimal combustion is smaller than that of the conventional gas burner, and the amount of combustion air is small, so that the shape of the mixing pipe can be simplified. I can do it.

According to the fifth aspect of the present invention, the distance between the mixture outlet of the mixing tube and the opening of the tubular portion is constant, and the concentration of the mixture in the mixing chamber can be made uniform. According to the invention of claim 6, positioning of the mixing tube in the horizontal direction can be easily and reliably performed, and the mixing tube can be maintained.

According to the seventh aspect of the present invention, a uniform flow of the air-fuel mixture is created in the communication hole of the air-fuel mixture straightening plate, and a smooth gas flow from the burner head to the burner plate can be promoted. Further, since the air-fuel mixture rectifying plate is connected to the burner head and the stepped portion, leakage of the air-fuel mixture from around the burner head can be prevented.

According to the eighth aspect of the present invention, the combustion air blown from the combustion blower is supplied from the lower part of the burner casing, becomes a uniform flow by the secondary air straightening plate, and is directly guided to the flame holes of the burner plate. He can get good combustion.

According to the ninth aspect of the present invention, the ignition plug and the combustion nozzle are located on opposite sides in position, so that ignition at the time of ignition can be reliably performed and ignition delay can be prevented. Then, the replacement work of the fuel nozzle corresponding to the fuel can be easily performed.

According to the tenth aspect of the present invention, the side plate provided with the reinforcing projections and the burner plate are integrated by caulking, whereby deformation and distortion of the outlet portion of the burner plate due to heat can be prevented.

According to the eleventh aspect of the present invention, the operation of storing the burner assembly in the burner casing can be performed reliably, and the position of the burner assembly is stabilized. According to the twelfth aspect of the present invention, the leakage of combustion air from around the burner plate is reduced, and the burner plate comes into contact with the burner plate to release the heat of the burner plate. I do.

According to the thirteenth aspect of the present invention, since the mixing pipe is provided with the obliquely rectifying plate, the resistance of the fuel gas ejected from the fuel nozzle is eliminated, and efficient rectification is performed.

According to the fourteenth aspect of the present invention, the air regulating plate can uniformly distribute the wind sent from the combustion blower to the burner plates on both sides and uniformly supply the air to each flame hole. Therefore, the air flow resistance is reduced, the air flow is made uniform, and a good combustion state can be obtained.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
To be described with reference to the drawings, a gas burner is applied to a refrigerant heating unit constituting device of an outdoor unit constituting a refrigerant heating type air conditioner.

As shown in FIGS. 2 and 3, an outdoor unit of a refrigerant heating type air conditioner having a refrigerant heating unit 38 is constructed. The housing 30, which is the unit body, has a front view,
Both the side view and the top view consist of a box formed in a rectangular shape.

The inside of the housing 30 is partitioned into two left and right chambers by a partition plate 31 except for the upper part of the housing. That is, the upper end edge of the partition plate 31 is separated from the upper surface of the housing by a predetermined distance, and the inside of the housing 30 cannot be partitioned here.

A housing 30 partitioned by a partition plate 31
The left space inside is called an air heat exchange chamber 32 and the right space is called a machine room 33. An outdoor heat exchanger 34 and an outdoor fan 35 are arranged in the air heat exchange chamber 32. In the machine room 33, a compressor 36, an accumulator 37 connected to the compressor 36, and a refrigerant heating unit 38, which will be described later, are arranged in an upper portion of the compressor.

The outdoor fan 35 is disposed on the front side of the housing 30, and the outdoor heat exchanger 34 is disposed on the suction side.
Is arranged. The housing 30 is provided with a suction grill and a blow grill (not shown).

In the gap between the upper edge of the partition plate 31 and the upper surface 30a of the housing 30, a part of an electrical component box 39 for accommodating electrical components and the like is interposed. That is, this electrical component box 3
9 is a refrigerant heating unit 3 arranged in the machine room 33.
8 and facing the housing upper surface 30a.

The cooling fin 4 is provided on one side of the electrical component box 39.
0a is protruded. The cooling fins 40 a are directly attached to components that dissipate high heat among the electrical components, and protrude into the air heat exchange chamber 32 from the upper edge of the partition plate 31.

On the other side of the electrical component box 39, a wiring terminal board 40b is mounted. A wiring opening 43 that can be opened and closed by a lid 42 is provided on the upper side surface of the housing 30 facing the wiring terminal plate 40b, and the electrical components in the electrical component box 39, the external city power supply, and the indoor unit are provided. It has terminals for wiring that are electrically connected.

A compressor 36 disposed in the machine room 33 is connected to the outdoor heat exchanger 34 via a refrigerant pipe (not shown) and forms a refrigeration cycle with the indoor heat exchanger in the indoor unit. Connected.

The refrigerant heating unit 38 includes a gas burner 44 having a combustion blower 47 and a gas burner 44.
A fuel heater 45 and a fuel supply device 46 that are integrally connected to the fuel cell system.

That is, a refrigerant heater 45 is connected to a side portion of the gas burner 44, and a combustion blower 47 is provided at a lower portion. The fuel supply device 46 is connected to the back side of the gas burner 44.

As shown in FIG. 1, the gas burner 44
Has a burner casing 9. The front surface of the burner casing 9 is open, and the front opening 9 a is closed by a lid 50 so as to be openable and closable.

Mounting seats 50a and 50b are mounted on the front side and upper and lower portions of the lid 50, respectively. A flame detection sensor 51 is mounted on the upper mounting seat 50a, and a spark plug 26 is mounted on the lower mounting seat 50b. The respective detectors and ignition portions are formed on the back side of the lid 50, which will be described later. It protrudes into the combustion chamber 52.

The burner assembly 16 is provided on the back side of the lid 50.
The burner assembly 16 can be attached to and detached from the burner casing 9 as the lid 50 opens and closes the burner casing opening 9a.

The blower 47 is connected to the lower surface of the burner casing 9.
Further, a nozzle hole 12 is provided on the upper surface of the burner casing 9.
, And the fuel nozzle 2 communicating with the fuel supply device 46 is inserted therein. The tip of the fuel nozzle 2 is inserted into the burner assembly 16.

Note that the diameter of the fuel nozzle 2 is sufficiently smaller than the diameter of the nozzle hole 12, and
The primary air can freely flow into the burner casing 9 from the surroundings.

The burner assembly 16 includes the combustion chamber 52
In addition, a mixing chamber 23 described later is integrally provided. FIG.
8 shows details of the burner assembly 16.

In this figure, a tubular portion 20 having a C-shaped cross section with an open upper portion is integrally provided along a pair of opening edges of the tubular portion 20, and is gently bent upward. The burner plate 17 includes a pair of side plates 18 which are straight at the upper portion and face each other in parallel with each other, and which close both side edges of the tubular portion 16 and the burner plate 17.

A mixing tube 14 composed of a tube for mixing the fuel gas and the primary air is accommodated in the tubular portion 20. A mixing chamber 23 is provided between the tubular portion 20 and the mixing tube 14.
Is formed.

The axis O of the mixing tube 14 is set at a position coincident with the axis of the tubular portion 20. This mixing tube 1
Reference numeral 4 denotes a tube body whose both ends are opened, and a flange 14a is integrally provided at an open end on the right side in the figure, and is fixed to the side plate 18 on the same side by caulking.

The left open edge of the mixing tube 14 is spaced apart from the same side plate 18 by a predetermined distance, and this opening is closed by a lid 21. 6 and 7, the cap 21a is fitted to the opening end of the mixing tube 14 to close the opening, and the center axis of the cap 21a. A lower portion is provided with a leg portion 24 projecting in a fan shape.

The edge of the leg 24 is formed in an arc shape based on the axis O of the mixing tube 14, and is mounted on the tubular portion 20. In other words, the axis O of the mixing tube 14 is correctly aligned with the axis of the tubular portion 20 over its entire length, and is supported by the tubular portion 20 so as to be kept parallel to each other.

The mixing tube 14 located near the lid 21 as described above.
An air-fuel mixture outlet 25 is provided at the position. The mixture outlet 25 opens at a position not opposed to the opening formed in the tubular portion 20, that is, at the lower side in the figure.

On the other hand, at the connecting position between the tubular portion 20 and the burner plate 17, an air-fuel mixture straightening plate 15 is arranged on the side of the mixing pipe 14, and the burner head 6 is installed so as to almost overlap the air-fuel mixture straightening plate 15. Is done.

The gas mixture rectifying plate 15 has a rectifying surface portion 15a having a width slightly smaller than the interval between the upper edges of the tubular portion 20, and a pair of stepped portions 15b provided integrally on both sides in the width direction of the rectifying surface portion. The stepped portion includes a pair of side portions 15c integrally provided along the respective edges, and the longitudinal direction is provided between the side plates 18.

The rectifying surface portion 15a is provided so as to close the upper end opening of the tubular portion 20, and a plurality of rectifying grid-like communication holes 8 are provided at predetermined intervals in the longitudinal direction. The stepped portion 15b is held parallel to the burner plate 17 connected to the tubular portion 20 with a small gap, and the end of the burner head 6 is inserted here.

The side surface portion 15c is formed in an arc shape having the same radius of curvature as the tubular portion 20, and is joined to the inner peripheral surface of the tubular portion. At both ends in the longitudinal direction, convex portions 28 protruding toward the inner surface are integrally provided.

The protruding portions 28 have tips at the ends thereof.
It is in contact with the outer peripheral surface. Therefore, the side surface portion 15c itself is provided at a predetermined distance from the mixing tube 14 in the axial direction.

The burner head 6 has a substantially M-shaped cross section except for both ends in the longitudinal direction, and the lower end thereof is formed with the stepped portion 15b of the mixture rectifying plate 15 and the lower end of the burner plate 17 as described above. It is interposed between the unit wall surface.

Accordingly, both side walls of the burner head 6 are joined to the wall surface of the burner plate 17 in close contact. Both ends in the longitudinal direction are joined to the inner wall surface of the side plate 18 in a tightly contacted state, and the burner head 6 is formed in an elongated rectangular box shape that is opened only on the lower surface side in the figure.

The upper surface of the burner head 6 projects into a space formed between the burner plate 17 and the side plate 18. That is, the space between the burner plate 17 and the side plate 18 forms the combustion chamber 52, and the upper surface of the burner head 17 protruding from the combustion chamber 52 and the M-shaped bent tops have a predetermined interval. Thus, an ejection port 6a is provided.

The burner plate 17 is provided with a large number of flame holes 7 in a grid-like arrangement with predetermined intervals in the vertical and horizontal directions. These flame holes 7 are all round holes, and are so-called burring, in which the edges are cut and raised from the outer surface side to the inner surface side.

As shown in FIG. 8A, the side plate 18 has a shape corresponding to the shape of the tubular portion 20 and the burner plate 17, and has an upper end portion and a peripheral end portion other than the upper end portion in FIG. Along, bent pieces 18a and 18b are provided integrally in opposite directions.

Except for the bent piece 18a at the upper end, the bent pieces 18b at both sides and the lower side are integrated with the tubular part 20 and the open end of the burner plate 17 by caulking.

At a predetermined position of the side plate 18, a plurality of reinforcing projections 29 projecting inward are provided as shown in FIG. The protrusions 29 reinforce the burner head 17 integrated with the side plate as well as the side plate 18 itself.

On the other hand, as shown in FIG.
A secondary air straightening plate 22 having a U-shaped cross section is attached along the outer surface of the connecting portion between the motor and the burner plate 17. Here, the secondary air straightening plate 22 is shown only on the front side, but the same one is also attached on the rear side in FIG.

A large number of rectifying holes 22a are provided in the horizontal plane of the secondary air rectifying plate 22, so that the air blown from the combustion blower 47 is rectified and conducted.

As shown in FIG. 3 again, a groove 3 is provided on the refrigerant heater 45 side of the opening 9a provided in the burner casing 9, and on the upper and lower ends thereof. These grooves 3
Has a U-shaped cross section, is provided across the side wall 9b that crosses the inside of the burner casing 9 from the end on the opening 9a side and faces the opening.

When the burner assembly 16 provided integrally with the lid 50 is accommodated in the burner casing 9, bent pieces 18 a provided on the side plate 18 along the upper and lower grooves 3 are inserted and guided.

When the burner assembly 16 is completely housed and arranged in the burner casing 9, a bent piece formed along the bent portion 18 a of the side plate 18 and the end edge of the burner plate 17 in each groove 3. 27 are engaged. Therefore, the burner assembly 16 and the burner casing 9 are in a completely sealed state.

This is an outdoor unit of such a refrigerant heating type air conditioner. By driving the compressor 36, the refrigerant flows through the outdoor heat exchanger 34 and the indoor heat exchanger (not shown) to form a refrigeration cycle. A cooling operation or the like is performed.

During the heating operation, the refrigerant is guided to the refrigerant heater 45 of the refrigerant heating unit 38, the fuel supply device 46 is opened, and the gas burner 44 performs a combustion operation.

The refrigerant in the refrigerant pipe P attached to the refrigerant heater 45 absorbs the heat of the combustion exhaust gas guided from the gas burner 44 along the combustion passage of the refrigerant heater 45 and rises in temperature. Therefore, the refrigerant evaporation temperature in the refrigeration cycle increases, and the set heating temperature can be reliably obtained.

Next, the combustion operation of the gas burner 44 will be described in detail. When the fuel gas is supplied from the fuel supply device 46 to the fuel nozzle 2, the fuel nozzle 2 ejects and supplies the fuel gas from the nozzle hole 12 formed in the burner assembly 16. Then, primary air that is a part of the air blown from the combustion blower 47 is supplied through a space between the nozzle hole 12 and the fuel nozzle 2.

The fuel gas and the primary air are jetted into the mixing pipe 14 and mixed. The mixture in the mixing tube 14 is
It is ejected from the mixture outlet 25 to the tubular part 20. Since the mixture outlet 25 is provided on the surface opposite to the opening of the tubular portion 20, mixing is efficiently performed even in the tubular portion 20.

That is, the mixture is mixed with the mixing tube 14 and the tubular portion 2.
After the mixture is sufficiently mixed in the mixing chamber 23 composed of 0, the mixture is guided to the burner head 6 through the communication hole 8 provided in the mixture rectifying plate 15. Furthermore, this burner head 6
And is supplied to the combustion chamber 52 from a discharge port 6a provided at the bottom.

The ignition plug 26 ignites in the combustion chamber 52, and a blue flame is formed around the flame hole 7. Subsequently, while air-fuel mixture ejected from the ejection port 6a of the burner head 6 into the combustion chamber 52 flows between the flame holes 7, the rectifying holes provided in the secondary air rectifying plate 22 from the combustion blower 47. Secondary air is supplied through the portion 22a and the flame hole 7, and a combustion flame is formed around the flame hole 7.

The flame formed around the flame holes 7 has a uniform shape and is completely burned before reaching the combustion chamber 52 opening. Then, the high-temperature combustion exhaust gas is guided into the refrigerant heater 45, and heats the refrigerant guided to the refrigerant pipe P.

The gas burner 44 operates in this manner, and the mixing pipe 14 is disposed in the tubular portion 20 so that the mixing chamber 23
And a burner plate 17 is connected to the tubular portion 20 to form a combustion chamber 52, and a burner assembly 16 having a burner head 6 interposed between the mixing chamber 23 and the combustion chamber 52 is provided. 16 is accommodated in the burner casing 9, the length of the combustion gas in the flow direction of the combustion gas is reduced to approximately half or less of that of the conventional gas burner at the mixing pipe 14, and the mixing pipe 14 and the burner plate 17 are included. The size is reduced by about 30%, so that the gas burner 44 can be made compact.

Since the tubular portion 20 forming the mixing chamber 23 and the burner plate 17 forming the combustion chamber 52 are integrally formed, the manufacturing process can be shortened. That is, the mixing tube a and the burner plate f are individually manufactured as in the related art,
In the final step, the work of screwing and fixing and connecting is unnecessary, and the loss associated with this work can be prevented beforehand.

The mixing pipe 14 is a bottomed pipe having one end opened. The fuel gas is supplied from the fuel nozzle 2 provided at the open end, the primary air flows in, and the mixing pipe provided at the other end. The configuration is such that it is ejected from the air outlet 25.

When the primary air amount of the burner assembly 16 was examined in practice, the primary air ratio λ (= primary air amount / theoretical air amount) at the time of optimal combustion was about 0.2 to 0.4. This is a value smaller than the primary air ratio λ = 0.4 to 0.7 of the burner still used for gas stoves and the like, and the amount of combustion air is smaller than that of the conventional burner.

Therefore, as compared with the conventional mixing tube a,
In the burner assembly 16 of the present invention, the shape and structure can be simplified, and the gas burner 44 can be made compact.
Further, the mixing tube 14 has one end supported by the side plate 18 via the flange portion 14a, and the other end connected to the leg 2 of the lid 21.
Since the mixing tube 14 is supported by the tubular portion 20 via the tube 4, the leveling of the mixing tube 14 can be accurately performed, and the holding of the mixing tube 14 is thorough. The concentration of the air-fuel mixture generated here is stabilized, the combustion state can be stabilized, and a good combustion state is maintained.

Then, the leg portion 24 of the lid 21 is connected to the tubular portion 20.
, The gap between the mixing tube 14 and the tubular portion 20 can be kept constant over their entire length in the axial direction,
A constant mixture concentration is obtained.

Since the mixture rectifying plate 15 is interposed between the mixing pipe 14 and the burner head 6, the mixture from the mixing pipe 14 is made uniform by the communication holes 8 provided in the mixture rectifying plate 15. From the burner head 6 to the combustion chamber 52
Smooth gas flow to is promoted.

Further, since the burner head 6 is attached to the air-fuel mixture straightening plate 15 and the tubular portion 20 without any gap, leakage of the air-fuel mixture from around the burner head 6 is reliably prevented. You. Therefore, the concentration of carbon monoxide (CO) in the combustion exhaust gas can be reduced, and uniform blowing from the ejection port 6a of the burner head 6 can be performed, so that the combustion flame can be stabilized.

The secondary air rectifying plate 22 is installed on the outer surface of the connecting portion between the tubular portion 20 and the burner plate 17 to rectify the air sent from the combustion blower 47 to form a uniform flow. It is led to the hole 7 as secondary air.

Therefore, the provision of the secondary air flow regulating plate 22 makes the flow of the secondary air uniform, thereby stabilizing the flame formed around the flame holes 7 of the burner plate 17 and improving the combustion exhaust gas. The carbon monoxide concentration can be reduced.

In the burner assembly 16, the fuel nozzle 2 was provided on one end side, the spark plug 26 was provided on the side face on the other end side, and the combustion blower 47 was provided on the end portion. Thus, the ignition plug 26 and the fuel blower 47 are
Is located on the opposite side, ignition at the time of ignition is reliably performed.

That is, at the time of ignition, the combustion blower 47 scavenges the combustion chamber 52 and the refrigerant heater 45 with air.
After the so-called prepurge, the ignition operation of the ignition plug 26 and the fuel supply from the fuel supply device 46 are performed.

The fuel gas is ejected from the fuel nozzle 2 into the mixing pipe 14 and mixed with the primary air to flow in the air-fuel mixture. The initial air-fuel mixture collides with the lid 21 closing the end of the mixing pipe 14. Then, it is ejected from the mixture outlet 25.

Then, as described above, it reaches around the ignition plug 26 and gradually flows through the entire combustion chamber 52. As described above, the air-fuel mixture at the time of ignition reaches the periphery of the ignition plug 26 first, so that reliable ignition can be obtained and so-called ignition delay is prevented.

The fuel supply device 46 supplies the fuel nozzle 2
The type of fuel gas supplied to the fuel cell is not constant, and it is necessary to mount a fuel nozzle having an optimum diameter for that type of fuel gas. In the above configuration, the fuel nozzle 2 is connected to the burner casing 9.
, The fuel nozzle 2 can be easily replaced.

At the time of combustion, the vicinity of the outlet of the combustion chamber 52 is 5
The temperature rises to 50-650 ° C. Due to such a high temperature, the burner plate 1 constituting the combustion chamber 52 is formed.
The material 7 and the side plate 18 may be thermally deformed in terms of material, leading to cracks and tears and abnormal combustion.

In the present invention, the burner plate 17 and the side plate 18 are connected by caulking to prevent thermal deformation due to high temperature. And the side plate 1
8, the reinforcing plate 29 is provided to reinforce the side plate 18 itself and prevent the burner plate 17 from being deformed or distorted. The burner plate 17 has many flame holes 7
In order to compensate for the lack of strength, a burring process is performed to cut and raise the periphery of the flame hole 7.

The following modifications may be adopted.
In addition, about the same component as the above-mentioned embodiment,
The same numbers are assigned and new explanations are omitted. That is, FIG.
As shown in the figure, at the opening 9a of the burner casing 9, the grooves 3A provided at the upper and lower ends of the refrigerant heating device 45 side are:
Only the open end is formed in a U-shape. However, inside the burner casing 9, only one side wall is tapered, and the most protruding portion is formed at the center, and the upper and lower grooves 3A communicate with the side wall 9b facing the opening 9a. A groove 3 is provided.

When the burner assembly 16 is housed in the burner casing 9 through the opening 9a, the upper and lower grooves 3A
As described above, the bent piece 18a provided at the end edge of the side plate 18 is inserted into the side plate 18.

At this time, since the groove 3A has the shape described above, the guide of the bent portion 18a can be smoothly performed.
A bent piece 27 provided at an end edge of the burner plate 17 is inserted into and engaged with the groove 3 of the side wall 9b.

Therefore, the position of the burner assembly 16 is reliably set, and a stable combustion state can be obtained. And, since the leakage of combustion air from around the burner assembly 16 is reduced and the region until combustion oscillation is generated is expanded,
The range which can be used as the gas burner 44 is expanded.

As shown in FIG. 10, the open end of the mixing tube 14A is closed by a closing plate 21A integrally provided with a leg 24. Here, the mixing tube 14A that contacts the closing plate 21A
A mixture outlet 25A, which is a notch, is provided on the end surface.

In the mixing tube 14A, the mixture is easily concentrated at the center. However, by providing the air-fuel mixture outlet 25A on the peripheral surface of the end of the mixing pipe 14A as described above, the air-fuel mixture is diffused to the surroundings, thereby eliminating the influence of dynamic pressure and improving the leaning of the air-fuel mixture. A uniform combustion state can be obtained.

A mixing tube 14B as shown in FIG. 11 may be used. The mixing pipe 14B is a pipe body having both ends opened. The fuel nozzle 2 is inserted into one end opening, and the other end opening is closed by a closing plate 21A used in FIG.

A plurality of slits 25B are provided at predetermined intervals on the lower surface of the mixing tube as a mixture outlet provided in the mixing tube 14B. In addition, in particular, a rectifying plate 4 is provided which is inclined over a predetermined length from the opening end on the fuel nozzle 2 insertion side to eliminate the resistance of the fuel gas ejected from the fuel nozzle 2 and to perform efficient rectification.

The mixture in the mixing tube 14B is
B is uniformly jetted out, so that the combustion flame is made uniform and a good combustion state is obtained. As shown in FIG. 12, a wind regulating plate 5 having a mountain-shaped cross section may be attached to the outer surface of the side plate 18 opposite to the side where the combustion nozzle 2 is inserted. The air conditioner 5 faces the outlet 47 a of the combustion blower 47 in a state of being housed in the burner casing 9 as the burner assembly 16.

The wind blown out from the combustion blower 47 collides with the air conditioning plate 5 and is distributed to both sides according to the shape. A burner plate 17 is provided in the direction of distribution to the air conditioning plate 5, and a flame hole 7 is provided here.

That is, by providing the air conditioning plate 5,
The air sent from the combustion blower 47 can be uniformly distributed to the burner plates 17 on both sides, and can be uniformly supplied to each flame hole 7. Therefore, a reduction in air flow resistance can be obtained, the flow of combustion air can be made uniform, and a good combustion state can be obtained.

In each of the above embodiments, the gas burner 44 is provided in the outdoor unit of the refrigerant heating type air conditioner. However, the present invention is not limited to this. The gas burner 44 may be provided in other devices such as a gas stove. You may.

[0112]

As described above, according to the gas burner of the present invention, the number of parts can be reduced by integrating the burner plate and the mixing tube, which leads to a reduction in cost and a compact structure by changing the structure of the mixing tube. Can be obtained,
This has the effect of reducing the size of the mounting device by reducing the mounting space.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, in which a part of a refrigerant heating unit provided in an outdoor unit of a refrigerant heating type air conditioner is exploded.

FIG. 2 is a vertical sectional front view of the outdoor unit according to the embodiment.

FIG. 3A is a cross-sectional plan view of the outdoor unit according to the embodiment. (B) is a vertical side view of the outdoor unit.

FIG. 4 is a partially cutaway front view of the burner assembly of the embodiment.

FIG. 5 is a perspective view of the embodiment with a part of the burner assembly cut away.

FIG. 6 is an exploded perspective view of a part of a burner assembly main part of the embodiment.

FIG. 7A is a perspective view of the embodiment, in which a main part of a burner is partially cut away. (B) is a partial front view.

FIG. 8A is a perspective view of a side plate according to the embodiment.
(B) is a partial longitudinal sectional view.

FIG. 9A is a perspective view of another embodiment, in which a part of a refrigerant heating unit is omitted. (B) is a cross-sectional plan view thereof. (C) is a longitudinal sectional view thereof.

FIG. 10A is a front view of a burner assembly according to still another embodiment, in which a part of the burner is partially cut away. (B) is a perspective view of a part thereof.

FIG. 11A is a front view of a burner assembly according to still another embodiment, in which a part of the burner is partially cut away. (B) is a bottom view of a part thereof.

FIG. 12A is a plan view of a burner assembly according to still another embodiment. (B) is a front view in which a part thereof is cut away.

FIG. 13A is a front view of a conventional burner assembly.
(B) is a side view in which a part thereof is cut away.

[Explanation of symbols]

 Reference numeral 20: tubular portion, 2: fuel nozzle, 47: combustion blower, 14: mixing tube, 25: mixture outlet, 23: mixing chamber, 6: burner head, 7: flame hole, 17: burner plate, 52 ... Combustion chamber, 16: burner assembly, 9: burner casing, 15: air-fuel mixture rectifying plate, 15a: rectifying surface portion, 15c: side surface portion, 15b: stepped portion, 8: communication hole, 21: lid, 24: flange portion , 28: convex portion, 22: secondary air straightening plate, 26: spark plug, 18a, 27: bent piece, 29: reinforcing projection, 3, 3A: groove portion, 4: straightening plate, 5: air conditioning plate.

Continued on the front page (72) Inventor Shigeto Sumitani 336 Tatehara, Fuji-shi, Shizuoka Prefecture Inside Fuji Plant, Toshiba Corporation (72) Inventor Mitoshi Koyama 336 Tatehara, Fuji City, Shizuoka Prefecture Inside Fuji Plant, Toshiba Corporation (72) Inventor Ryoji Honma 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd.

Claims (14)

[Claims] 1. A tubular part having a substantially C-shaped cross section, and a part of a fuel gas provided from a fuel nozzle and a part of air supplied from a combustion blower disposed in the tubular part are introduced as primary air. A mixing chamber having a mixing pipe for mixing, a burner head provided at an opening edge of the tubular portion, and a plurality of flame holes integrally extending from the opening edge of the tubular portion downstream of the burner head. A combustion chamber having a pair of burner plates each having an opening, a burner assembly connecting the mixing chamber and the combustion chamber, and a burner casing accommodating the burner assembly therein. And gas burner. 2. The method according to claim 1, wherein the mixing tube is provided between the burner head and the mixing tube.
2. The gas burner according to claim 1, wherein an air-fuel mixture straightening plate is interposed between the air burner and the air burner. 3. The gas burner according to claim 1, wherein said burner assembly comprises integrally molding said tubular portion forming said mixing chamber and said burner plate forming said combustion chamber. 4. The mixing pipe is a bottomed tubular body in which a fuel nozzle is inserted into one end opening and the other end opening is closed, and is provided with a mixture outlet for ejecting the mixture on the peripheral wall thereof. The gas burner according to claim 1, wherein 5. The mixed gas outlet portion of the mixing tube is provided near the closed end and at a position not opposed to an opening formed in the tubular portion.
The described gas burner. 6. A bottom portion of the mixing tube is formed by a lid for closing an open end, and a flange portion is extended outward on the lid, and a front edge of the flange portion is formed on an inner wall surface of the tubular portion. 5. The gas burner according to claim 4, wherein the end of the mixing tube is supported in contact with the mixing tube. 7. The gas mixture rectifying plate includes a rectifying surface portion having a plurality of rectifying lattice-shaped communication holes, a side portion extending on both sides of the rectifying surface portion and facing the mixing pipe, and a rectifying surface portion. A stepped portion which is interposed between the side surface portion and the burner head and is fitted with the burner head. 3. The gas burner according to claim 2, wherein a convex portion for forming a predetermined gap is provided between the gas burners. 8. A secondary air rectifying plate for distributing secondary air as combustion air blown from the combustion blower is disposed on an outer surface of a connecting portion between the tubular portion and the burner plate. 2. The gas burner according to claim 1, wherein the air straightening plate is locked on the inner wall surface of the burner casing. 9. The burner assembly according to claim 1, wherein a fuel nozzle is arranged in an upper part of the mixing chamber, a combustion blower is arranged in a vertical series with each other in a lower part of the mixing chamber, and an ignition plug is arranged in a lower part of the combustion chamber. The gas burner according to claim 1, wherein 10. The tubular part and the burner plate are formed with bent pieces along the opening on both sides thereof, and the tubular part and the burner plate are formed by a side plate provided with the bent pieces connected to the bent piece by caulking. The gas burner according to claim 3, wherein both side openings of the burner plate are closed, and a plurality of reinforcing projections are provided near bent pieces of the side plate. 11. The burner casing is provided with a groove which gradually narrows from an entrance side to an insertion side, and a bent piece of the side plate is inserted and engaged in the groove, and the burner assembly is housed in the burner casing. The gas burner according to claim 10, wherein the gas is burned. 12. The gas burner according to claim 10, wherein the burner casing is provided with a groove for inserting a bent piece of the burner plate into an inner wall surface thereof and sealing the bent piece. 13. The gas burner according to claim 4, wherein the mixing pipe includes a straightening plate which is inclined over a predetermined length from an opening end on the fuel nozzle insertion side. 14. A cross-sectional ridge for uniformly distributing the wind sent from the combustion blower to the burner plates on both sides of the side plate on the side opposite to the combustion blower and supplying and guiding the air to a flame hole provided in the burner plate. The gas burner according to claim 10, further comprising a shape regulating plate.