JP2796512B2 - Gaseous fuel burner device and gas appliance incorporating such a burner device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gaseous fuel burner device and a gas appliance incorporating such a burner device. The invention particularly relates to gas-fired cooking appliances, such as household gas-fired cooking appliances.

[0002]

BACKGROUND OF THE INVENTION Many common household, gas and cooking utensils include cooking ovens, which are usually
Immediately below the opening in the floor of the oven, it is heated by a gaseous fuel burner located at the rear of the oven.

[0003]

When using this oven in such a cooker, it has been found that the internal temperature is different before, after, and below and above the oven. This variation results in uneven heating and thus uneven cooking of the food item in the oven.

[0004] It is therefore an object of the present invention to provide a gaseous fuel burner device that provides more uniform heating when installed in a gas-fired appliance.

[0005]

According to the present invention, space is reduced.
A gaseous fuel burner device for heating, this space
Is partially extended by a wall extending laterally from the end wall.
Defined, positioned in said space and said end wall
A baffle separated from the
Also has one hole, and between the baffle and the end wall.
And located in the center of the baffle
Gas burner having a burner head,
Fan blades arranged around the pad.
Through the at least one hole,
The area from the space between the baffle and the end wall
To draw air back into the space
And a motor for rotating the fan blades is provided.
A gas fuel burner device is provided.
You.

[0006] This burner head may be supported in the conduit for supply of gas fuel.

[0007] In this case, the conduit is <br/> Oh Ru Liu in the rotor shaft of the motors. Fan blades may be secured thereto for rotation together with the rotor shaft. Instead, the fan
Blades may be fixed thereto for rotation with server Naheddo.

In another embodiment of the invention, the motor has a rotor shaft fixed to the burner head for rotation therewith, and the fan blades fixed thereto for rotation with the burner head. , so as to penetrate the conduit for the rotor shaft for supplying the gaseous fuel
Has become .

[0009] The apparatus may include a tube for supplying gas to the conduit, which may terminate with an injector positioned to direct gas to the conduit.

The burner head may be a hollow cylindrical body having an interior communicating with the conduit and one end face of which is a porous disk forming the combustion surface of the burner head. The disc opposes the baffle, which is located centrally with respect to the disc.

In another embodiment of the present invention, the fan blades
The root is mounted for rotation about an axis that is coaxial with the conduit, and the fan blades are rotated by the motor via drive transmission means connecting the motor output shaft to the fan blades .

[0012] The gaseous fuel burner may be a dual burner and may include two burner heads, each with its own fuel supply conduit. These burner heads may be arranged coaxially, much like the respective conduits are arranged coaxially . The conduits may be arranged one inside the other, in which case the inner conduit is fixed to it for rotation with the rotor of the motor, and the outer rotor is fixed to it for rotation with the inner rotor. It is fixed.

Further, according to the present invention, there is provided a gas appliance for cooking.
And extends laterally from the rear wall to provide cooking space
Sidewalls defining a portion of the cavity to be positioned and disposed within the cavity
Gas burner for supporting the burner head
Fan blades positioned around the
Positioned within the cavity and spaced from the rear wall.
The burner head and the fan blades for cooking.
A baffle for separating from a space, and a baffle for the baffle
The burner head having at least one hole formed therein.
Is located in the center of the baffle and the fan blades are
The at least one hole.
Air from the cooking space through
That the air is returned to the cooking space.
A gas appliance featuring the features is provided.

[0014]

An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings.

FIG. 1 shows, in simplified schematic form, a burner device embodying the present invention, which in this embodiment is the oven cavity of a domestic gas cooker, which is suitable for heating the space 1. This gas cooker is based on the British patent application GB2255.
632A (9208761.8), and behind the cavity 1, there is a plenum 2 defined by a front wall 3 and a rear wall 4, in which air from the atmosphere is supplied. Retract by fan not shown. The cavity 1 has a rear wall 5, a floor 6, a roof 7, and side walls. This rear wall 5 is separated from the front wall 3 of the charging chamber 2, and the space created by this separation may be filled with a heat insulating material.

Housed in the charging chamber 2 is an electric motor 8 supported by a framework 9 mounted on the front wall 3 of the chamber 2. The rotor 10 of the motor 8 is mounted to rotate with a hollow shaft 11 extending into the cavity 1 through both the front wall 3 and the rear wall 5 with a gap as shown. The shaft 11 is rotatably supported by suitable bearings supported by the framework 9, but is not shown in FIG.

At the end of the shaft 11, inside this cavity 1, a centrifugal fan blade 12 is fixed, while the burner head 13 is fixed at the same end. The burner head 13 is a hollow cylindrical body, and the inside thereof communicates with the inside of the shaft 11 through an opening in an end wall 14 of the head 13. The front wall 15 of the burner head 13 is composed of a perforated disk 16 which is the combustion surface of the burner. The disc may be made of a stainless steel mesh or fiber mass, or it may be a stainless perforated disc or a porous ceramic disc.

The other end of the shaft 11 projects into the double-walled structure 17 and communicates with the atmosphere enclosed by it. Attached to the inner wall of the structure 17 is an injector 18 aligned with the center of the open face of the shaft 11 and slightly away from it as shown. The space between the walls of the structure 17 is connected to a gas supply pipe 19.

The fan 12 and the burner head 13 are covered and separated from the interior of the cavity 1 by a dish-shaped concave baffle 20 whose outer periphery is close to the end wall 5 of the cavity 1. It is separated from it by the annular gap 21. The floor 20a of the baffle 20 has holes 22 arranged in a series of concentric circles when viewed from the direction of the arrow 23.
No holes are provided in the area of the floor 20a immediately before the disk 16. In that way, there is little or no air directly hitting the surface of this disc 16,
There is almost no change in the shape of the flame on its surface.

The supply of gas to the interior of structure 17 via tube 19 is controlled by gas flow control means, not shown in FIG. 1, which is exposed to the temperature of cavity 1. It incorporates thermostat temperature control with a temperature sensor. Additionally, the burner 13 preferably has an igniter that is activated when the gas control is operated to its "on" position.

An electric switch for controlling the energization of the motor 8 and another switch for controlling the energization of the motor for driving the fan in the charging chamber 2 are connected to the control means.

When performing the cooking operation in the oven, the foodstuff to be cooked is placed on the shelf (not shown) of the oven and the gas control is in its "on" position. This energizes the motor 8 and activates the ignition device. At the same time, the motor for driving the fan in the charging chamber 2 is also energized. The gas leaving the injector 18 rides on the primary air flowing into the open end of the shaft 11 with the aid of the air pressure in this plenum. The air flow into this shaft is also facilitated by the rotation of the fan blades 12. In FIG. 1, this air flow is indicated by arrow 24. This air mixes with the gas as it flows along the interior of the shaft 11. The resulting mixture ignites on the surface of the disk 16 and the disk 16 quickly reaches an incandescent state, and heat is transferred to the baffle and thus to the interior of the cavity 1. When the motor 8 is energized, the fan blades 12 rotate,
Air from the interior of the cavity 1 is drawn through the holes 22 and passes over the hot surface of the baffle and back into the cavity 1 via the gap 21. In this way, there is a circulation of hot air in the cavity 1 and the former is rapidly heated to the desired temperature. This air circulation ensures that the cavity 1 is quickly brought to a uniform temperature from corner to corner. Shaft 11 and walls 3 and 5
There is also a small flow of air flowing through the gap between the baffle and the space defined by the baffle and the rear wall 5. The flow, indicated by arrow 26, ensures that the air inside this cavity is not so dirty that it cannot support the burning of gas on the disc 16 and the normal slight air flow from this cavity 1 It also provides air to make up for spill losses.

When the temperature of the cavity reaches the temperature at which the thermostat is set, the gas supply is turned "on" and "off" as necessary to maintain the temperature of the cavity at this set value. You.

At the end of the cooking operation, the gas flow control means is returned to its "off" position, the operation of which deactivates the motor 8 and stops the circulation of air in the cavity 1. The motor that drives the charging chamber fan may also be deenergized.

This space 1 need not be that of an oven cavity, but may be the space of some other gassing equipment, for example this space may be part of an air conditioner,
It will be appreciated that a heat exchanger or room heater may be included.

It may be desirable to replace the central portion of the floor 20a of the baffle 20, ie, just before the disk 16, with heat resistant glass or some other heat resistant transparent material.
In this way, the burner surface is visible to the user and the user can check whether the burner is operating.

FIG. 2 shows a slightly modified version of the embodiment of FIG. In FIG. 2, parts similar to those of FIG. 1 are given the same reference numbers.

Located in the charging chamber 2 is a motor 8 supported by a framework 9 mounted on the front wall 3 of the chamber 2. The rotor 10 of the motor 8 is mounted for rotation with the hollow steel shaft 11 and the rotor is pressure-fitted thereto. This shaft is supported by this support framework 9
Are rotatably mounted by a sintered bronze bearing 27. This shaft 11 has a gap 1
Through the hole 28 in the rear wall 5. As can be seen in FIG. 2, the surface of the rear wall 5 of the cavity 1
It is smoothly rounded towards 8, thereby maintaining a smooth flow of air through this hole, as described below. In FIG. 2, a heat insulating material 30 is packed between the wall of the cavity and the front wall 3 of the charging chamber.

In the embodiment shown in FIG. 2, the cylindrical body of the burner head 13 has a central tubular extension which is snap-fit to the adjacent end of the shaft 11. The edge of the cylindrical body of this burner is stepped, like 32.
It receives a disk 16 which forms the combustion surface of this burner.

The fan blades 12 are fixed to the rear surface of the burner head by tapping screws 33 as shown in FIG.

The embodiment of FIG. 2 also replaces the air inlet holes 22 of the baffle 20 of FIG. 1 with spaced openings 34 in FIG. 2 so that their inner edges are remote from the disc 16 so that air can escape. It has a baffle 20 similar in shape to the baffle of FIG. 1 except that it directly strikes the disc and does not adversely affect the combustion of the gaseous fuel. Further, there is a further circular hole in the baffle 20 in the center of the floor 20a of the baffle 20 and aligned with the disk 16. The inner edge of the circular hole is upset, as shown at 35, to receive a window 36 of heat resistant glass or other suitable transparent material.

Gas is supplied to the burner by a pipe 37 from a gas supply main (not shown). The tube 37 terminates in an injector 38, which aligns with the center of the open end 39 of the shaft 11 and thus burns fire directly along its longitudinal axis.

FIG. 2 also shows the ignition electrode 40 of the igniter, which is activated when the gas flow control means of the gas supply line to this burner is operated in the "on" state. A switch for controlling the energization and de-energization of the motor 8 and a switch for the motor for driving the fan in the charging chamber include:
Connected to the control means.

The embodiment of FIG. 2 operates in a manner generally similar to that of FIG. When the gas flow control device is turned on, the gas exits the injector 38 and enters the charging chamber 2
Ride the air from. The air in the plenum is under pressure, which aids the operation of the injector, and when a suitable amount of air flows into the shaft 11 and gas exiting the injector 38 flows through the shaft 11 to the burner head. Ensure that they are mixed. This mixture is ignited on the outer surface of the disc 16. The air in the cavity 1 is drawn in from the opening 34 and is pushed into the gap 21 under the action of the fan blades 12, from where it is returned to the cavity 1. The air flow is indicated by arrow 41 in FIG. As indicated by arrow 42,
Air is also drawn by fan blades 12 through opening 28 and over smooth contoured surface 29 to prevent contamination of air circulating within this cavity, as in the embodiment of FIG. It also compensates for the air loss that results from forcing combustion products out of the oven through the oven door vents or other exits from the oven cavity.

Thus, as described above with reference to FIG. 1, heated air flows into the cavity, which, in combination with the heat conducted through the baffle 20, rapidly sets the temperature inside the cavity 1 to a predetermined value. And that the temperature is constant from corner to corner of the cavity.

Operating this control to its "off" state deactivates the motor 8 and also deactivates the motor that drives the fan in the charge chamber.

Although the embodiments of FIGS. 1 and 2 both require the use of a hollow motor shaft to carry the fuel mixture to the burner head, this is not essential, and FIG. 3 shows a motor with a hollow rotor shaft. Another embodiment that does not require the following is shown.

The configuration of the embodiment of FIG. 3 is generally similar to that of the embodiment of FIG. 2, so the same parts in both embodiments are given the same reference numbers as in FIG.

The plenum 2 thus houses a motor 43 of conventional construction, the rotor 44 of which passes through the opening 28 in the front wall 3 of the chamber 2 and aligns the rear wall 5 of the oven cavity 1. Attached to a rotor shaft 45 that also extends through the bore 46. The shaft 45 is connected to the wall 5 in the oven cavity.
And its end is threaded and receives a tubular nut 47, thereby securing the burner head 13 to the shaft 45. The shaft 45 extends through the rear wall 48 of the burner head as shown. The rear wall 48, a series of holes 49, these holes 49 is on the longitudinal axis and concentric circle of the shaft 45.

The burner head 13 also has a rearwardly extending tubular portion 50 having a relatively large inner diameter. Portion 50 is coaxial with axis 45 and passes through hole 46 and opening 28 with some clearance, and as will be described below, this chamber 2
To allow limited air to flow from. As in the embodiment of FIG. 2, the burner 13 is a surface combustor in which fuel burns on the surface of the disc 16 which is pressed against the shoulder 32 of this head by the outer flange 51 of the nut 47.

The fan blades 12 are attached to the burner head 13 and are fixed to the rear wall 48.

Through this chamber 2 a pipe 52 carrying an air / gas mixture from a mixing chamber located on the outer surface of the wall of the plenum 2 passes. The mixing chamber is supplied with gas and air from a source of pressurized air, and the two are mixed in this chamber before the pipe 5
Passed through 2. The use of such a mixing chamber is described in British Patent Application No. 93.1732.9. Tube 52 terminates near the open end of section 50, from which the gaseous fuel mixture enters section 50 and enters burner head 13 via opening 49, as indicated by arrow 53.

Between the burner head 13 and the cavity 1 is a baffle 20 having the same shape as the baffle 20 of the embodiment of FIG.

The embodiment of FIG. 3 works in the same way as that of FIG. Operating the gas flow means controlling the flow of gas to the mixing chamber to its "on" position results in the fuel mixture flowing to the burner head, where it is ignited by the igniter 40 on the surface of the disk 16. . At the same time, like the motor for driving the fan in the charging chamber 2, the motor 43
Is energized. When the fan 43 is rotated by the motor 43, air is drawn from the cavity 1 through the opening 34 and pushed out from the gap 21, and the flow is indicated by an arrow 54.
Indicated by As shown by the arrow 55, air is also drawn in from the gap 28 to prevent air contamination in the cavity 1 as before.
It serves to compensate for combustion product emissions.

As in the embodiment described above with reference to FIGS. 1 and 2, the interior of this cavity quickly reaches a constant, desired temperature from corner to corner.

Operating this control means to its "off" state deactivates the electric motor 43 and may also deactivate the motor that drives the fan in the plenum.

FIGS. 4 and 5 are a front view and a side view of the fan blade 12, respectively. The blade is made of a mild steel plate and has, for example, six arms 56 extending radially from a central portion 57. Each arm 56 has an upward edge 58 projecting at a right angle from the rest of the arm, and its upper edge 5
9 is rounded at one end, as shown at 60, and has an inclined edge 61 at the other end. This central portion 57 has a central hole 62
The diameter depends on whether the blade is used in the embodiment of FIG. 1, or on FIG. 2 or FIG. Moreover, if this blade were used in the embodiment of FIG. 2, there would be a hole in this central part to receive a screw 33 fixing this blade to the burner head.

It will be appreciated that it is not essential to incorporate this burner device into a cooker with a plenum behind the oven cavity. The fan blades 12 provide sufficient air to provide both primary and secondary air suitable to support complete combustion of the gaseous fuel gas.
It is also possible to rely on.

Furthermore, it is not essential that the rotor shaft use fan blades that are rotated by a motor through a conduit that supplies gaseous fuel to the burner head. In another embodiment,
The burner head is fixed relative to the cooker structure, and a fan is rotatable about an axis that is coaxial with the burner head axis, but is disposed adjacent to the burner head, and It may be driven by an unaligned motor.

Such a drive is shown in diagrammatic form in FIG. 6 and shows the device in an oven configuration similar to FIG. In FIG. 6, parts similar to those of FIG. 1 have been given the same reference numerals.

The burner head 13 is connected to the gaseous fuel supply line 6.
4, this conduit passes through an opening 65 in the front wall 3 of the plenum 2 and in the rear wall 5 of the oven cavity 1. Gas is supplied to the open end of this conduit 64 via an injector 66 at the end of a gas supply tube 67, from which the gas rides on the primary air, as indicated by arrow 68. The pressure in chamber 2 facilitates it.

The fan blades 12 are indicated by hollow shafts 69 which are rotatably mounted on bearings 70 arranged around this conduit 64. The pulley 71 fixed to the shaft 69 is connected by a drive belt 72 to a pulley 73 fixed to a rotor shaft 74 of the drive motor 8. The motor 8 is housed in the charging chamber 2.

The fan 12 and the burner head 13 are separated from the oven cavity by a baffle 20, the outer circumference of which is separated from the adjacent rear wall 5 by a gap 21.

The embodiment of FIG. 6 operates similarly to the embodiment of FIG. When the gas flow means controlling the supply of gas to the injector 66 is turned on, the gas enters the conduit 64 and at the same time rides on the air, as indicated by the arrow 68, and the mixture passes through the conduit 64. To the burner head 13 where it is ignited on its surface by an igniter (not shown) that is activated when the gas flow control means is operated. The operation of the gas flow control means is controlled by the motor 8
And the fan blades 12 rotate, drawing air from the cavity through the openings 22 and, as indicated by the arrow 75,
Extrude from gap 21. The operation of this gas flow control means
If the plenum fan is not yet running, the motor that drives it is also energized.

The cavity 1 quickly reaches the desired, preset temperature, which is constant from corner to corner of the cavity.

Operating this control to its "off" position may deactivate the motor 8 and deactivate the motor that drives the fan in the charge chamber.

The embodiment of FIG. 6 can also be used without the plenum 2 in which case the primary air is mainly driven by the entrainment effect of the gas leaving the injector.
By the action of 2, it is drawn from the atmosphere.

In the embodiment described above with reference to FIGS. 2, 3 and 6, the flow of gaseous fuel to the burner head is
It is completely “on” or “off”. It is possible to use dual burner heads with low or high heat output. In this case, the preset temperature is maintained by using this dual burner low heat output or high heat output.

FIG. 7 is a simplified diagram of an oven provided with a gas burner device having a dual gas burner. In FIG.
Parts similar to those already described with reference to FIG. 3 above are given the same reference numerals as in that figure.

The motor 8 has a rotor shaft 45 which passes through an inner conduit 80 having a bell-shaped end 81 supporting an inner, surface combustor disc 83. This shaft 45 is fixed to a tubular extension 84 of an end wall 85 of a member 86 located inside the end 81 as seen in FIG. This end wall 85 has a series of spaced circular holes 87, the center of which are
Is on a circle concentric with the vertical axis.

The conduit 80 is in an outer conduit 88 of a shape corresponding to the shape of the inner conduit, the outer conduit having a bell-shaped end 89 supporting an outer surface combustor ring 89a, and a cup-shaped member 90. From the end 81. Member 90
Has an outer peripheral flange 91 secured to the conduit 88, as can be seen in FIG. The floor 92 of the member 90 also has a series of circular holes 93, the centers of which are also on a circle concentric with the longitudinal axis of the shaft 45.

The bell-shaped end 89 also has an external flange 94 to which the fan 12 is fixed to allow air to flow through the cavity 1.
, Through a series of spaced, circular inlet openings 34 and after this separation through the baffle 20 circulates to a series of outlet holes 95 adjacent the periphery of the fan. Baffle 20 also has a central opening 96 aligned with the ends of members 81 and 89 and the surface combustor supported by them. A transparent, heat-resistant window 97 is attached to the opening 96.

Gaseous fuel is supplied to the inner conduit 80 at a relatively low flow rate by a gas supply tube 98 having an injector 99 at the end. The second gas fuel pipe 100 supplies the fuel at a relatively high flow rate into the passage between the inner conduit 80 and the outer conduit 88. Tube 100 also has an injector 101 at its end, as shown.

The flow of gaseous fuel through tubes 8 and 100 is controlled by fuel flow control means, which allows the user to select which of the surface combustors 83 and 89a to use, or This means that the inner combustor 83 is always used first, and then this cavity 1
The outer combustor 89a may be automatically continued when either the inside reaches a predetermined temperature or a predetermined time has elapsed. Thereafter, when the temperature in the cavity 1 reaches a value set by the user, the internal combustor 83 is turned on and off.
Operation maintains that temperature. Alternatively, a preset temperature can be maintained by the “on”-“off” operation of the outer combustor 89a.

As just described, combustors 83 and 89a
The operation of the embodiment of FIG.
It is the same as that of the embodiment of FIG.

[Brief description of the drawings]

FIG. 1 is a simplified, schematic side view of a first embodiment of a gaseous fuel burner device.

FIG. 2 is a side view of a simplified form of a portion of a gas cooker incorporating a burner apparatus embodying the present invention.

FIG. 3 is a simplified side view of a portion of a gas cooker incorporating a gas burner apparatus embodying the present invention.

FIG. 4 is a front view of parts of the burner device.

FIG. 5 is a side view of parts of the burner device.

FIG. 6 is a schematic view of a further embodiment of the present invention.

FIG. 7 is a schematic view of a further embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 space 2 charging chamber 5 rear wall 8 motor 11 rotor shaft 12 fan 13 burner head 16 disk 18 injector 19 tube 20 baffle 20a floor 21 outlet 22 hole 31 tubular extension 34 hole 36 window 37 tube 38 injector 40 ignition electrode 45 Rotor shaft 47 Nut 52 Tube 66 Injector 67 Tube 80 Duct 81 Bell end 83 Burner head (burning surface) 88 Duct 89 Bell end 89a Burner head (burning surface) 96 Opening 97 Window 98 Tube 99 Injector 100 Tube 101 Injector

Claims (5)

(57) [Claims] 1. A gaseous fuel burner unit for heating a space, this space is a wall extending from the end wall in the transverse direction
Therefore, a part thereof is defined, and the position in the space is defined.
A baffle defined and separated from said end wall;
The baffle has at least one hole and the baffle
A baffle disposed in an area between a full and said end wall;
Fuel with a burner head positioned at the center of the
A burner and a fan arranged around the burner head
Blades, wherein the fan blades comprise the at least one
Air is passed through the holes from the space to the baffle and the
Drawn into the area between the end wall and the air
It is designed to return to the space, and the fan blades
A gas fuel bar comprising a motor for rotating
Device. 2. The burner head is located at the center of the baffle.
Area, and the motor drives the burner head.
A rotor shaft movably connected to the rotor shaft;
Also provides a gaseous fuel supply conduit communicating with the burner head.
2. The gaseous fuel burner arrangement according to claim 1, forming a tube.
Place. 3. The fan blade is fixed to the burner head.
Is fixed and rotates with the burner head.
The gaseous fuel burner device according to claim 2, wherein 4. The gaseous fuel is passed through a gaseous fuel supply conduit.
Into the gaseous fuel supply conduit
Injector positioned to direct gaseous fuel
Wherein the motor has a burner head with it.
A rotor shaft mounted for rotation;
The fuel shaft extends through the gaseous fuel supply conduit and
The blade is fixed to the burner head, and the bar
2. The method according to claim 1, wherein the head rotates with the head.
A gaseous fuel burner device as described. 5. A gas appliance for cooking, comprising :
Part of the cavity extending in the direction to provide cooking space
A defining sidewall and a burner head disposed within the cavity
Gas burner supporting the
Fan blades positioned in the cavity and positioned in the cavity
And separated from the rear wall, the burner head
And the fan blades are separated from the cooking space.
And Menoba Waffles, at least provided in the baffle
And the burner head is located in the baffle.
The fan blades are connected to a motor and
Conditioned air through the at least one hole.
The cooking air is drawn in from the working space, and the drawn air is used for cooking.
Gas unit characterized by being returned to space
Utensils.