CN105889915A - Gas burner - Google Patents

Abstract

A gas burner (1) for a heater comprises a planar metal frame portion (2) with an elongated opening (3) defined by two longitudinal edges (5) and by two transversal end edges (6), as well as a combustion membrane (7) in the form of a tridimensional shell, connected to the frame portion (2) along the longitudinal (5) and transversal (6) edges, wherein the combustion membrane (7) has a diffuser layer (8), which forms an outer combustion surface (9) made of a perforated metal sheet, and which extends between the two longitudinal edges (5) with a single curvature out of the plane of the frame portion (2), and two closure portions (11) made of metal sheet extending from the transversal edges (6) out of the plane of the frame portion (2) and which close end areas (12) between the diffuser layer (8) and the transversal edges (6) of the frame portion (2).

Description

Gas burner

Technical field

The present invention relates to a kind of burner for gas heater.

Background technology

The gas heater of prior art includes: the combustor with heat exchanger is connected with combustor Or it is positioned at combustor with by coming at the mixture of combustor combust fuel gas with combustion air Produce the burner of heat, be used for the feed pipe of the mixture supply of gas and air to burner, And for supporting burner and burner being connected to the framework of combustor.

The burner of prior art includes that burner membrane, burner membrane have:

-inner surface, flowing connects with feed pipe for it, or with the mixing chamber of fuel gas mixture and / or distributor chamber flowing connection, and

-bubbler layer, it forms the outer surface (or combustion front) of burner membrane, towards combustor,

Further, mixture is transferred in combustor by burner membrane, sends out in a combustion chamber on combustion front Light a fire the burning of flame pattern form.

Bubbler layer is made up of the wall with multiple through hole.According to the type of burner membrane, this wall is permissible Be plate, the fabric of perforation, (for simplicity, silk screen and fabric hereinafter will use term to silk screen " silk screen " represent), or can be ceramic material porous or perforation wall.

Divide additionally, can arrange in the upstream (with reference to the flow direction of gas-air mixture) of bubbler layer Orchestration, it is therefore an objective in a desired manner towards diffusion wall distributive mixing thing.Known allotter is typically manufactured Becoming to have the wall of multiple through hole, such as this wall is made up of plate that boring a hole, and, this wall can form burning " interior " layer of film, or the parts separated with burner membrane can be formed.

By hot combustion gas (by convection current) and by heat radiation, the heat produced by burning is passed It is handed to heat exchanger, to add hot fluid (such as water), then delivers fluid to user, such as, pass Give the heating system of living space etc. and/or the heating system of the industrial treatment of water purification.

For heater orientation, safety purposes, it is desirable to control and can change in a controlled manner Become the heating power of burner and change the local velocity by the fuel mixture of burner membrane and total Flow velocity.

It practice, the flow velocity of fuel mixture can affect flame temperature, burner membrane temperature, total thermal power And flame holding, and even can adversely cause undesirable unstability phenomenon and flame Separate with combustion front.

In addition to the local velocity of fuel mixture, flame holding additionally depends on the local of burner membrane Temperature, and this local temperature can be by the geometry in burner membrane and in support frame and distribution of weight Impact.To this end, burner membrane is generally made up of metal gauze or fabric, it is easy to formation three-dimensional, double The shape of curvature.

Although the plate of perforation can easily fold around single axis (or paralleling to the axis around multiple), But, have the shape around multiple unparallel shaft curvatures of a curve can produce in the plane of plate stretching, Hole is made to produce deformation uncontrollable, unrepeatable, thereby increases and it is possible to plate " bridge " occurs between adjacent hole Fracture.

On the other hand, metal web is expensive and size is unstable, therefore usual and support wire net It is applied in combination, which in turns increases the cost of burner.Additionally, the characteristic of metallic fiber silk screen (is oozed Property, thickness, density thoroughly) there is the statistical distribution that standard deviation is high.This makes it difficult to control impact combustion The parameter burnt, and cause the igniting of burner, fire defector, fuel flow rate load and compare thermal power The uncertainty of (specific thermal power).

The burner of a kind of common type has smooth metal framework, and it has elongated open, elongated Opening has two parallel straight line longitudinal edges and two semicircular end edge, burner membrane with by The bubbler layer that metal gauze is made is fixed to this metal framework together, and this bubbler layer has " pancake roll (cannoli) shape of " or half cigar (semi-cigar), wherein, core is cylindrical sections Shape and two ends be spherical segment shape.

The known burner of this type shows the advantage of prior art in an exemplary fashion and lacks Point: the use of metal gauze is easy to form complicated 3D shape, keeps the perforation of silk screen or many simultaneously Permeability feature is almost unchanged, but, this is with higher relative to plate and porous ceramic layer of metal gauze Cost and the bigger statistics of characteristic (distribution of weight, permeability, mechanical strength and thermal expansion) become The property changed is cost.

Summary of the invention

Therefore, it is an object of the invention to provide a kind of burner with 3 dimensional coil geometry, it has Such as avoid the feature of at least some shortcoming of prior art.

Another specific purposes of the present invention are preferably to meet to better control over combustion parameter and with low one-tenth The demand of this manufacture burner membrane.

The another specific purposes of the present invention are to provide the type of a kind of pancake roll shape (cannoli-shaped) Burner, it improves to some extent manufacturing, in terms of cost and combustion characteristics repeatability.

According to the present invention, the gas burner for heater includes:

-smooth metallic framing portions, it has the longitudinal edge relative by two and two transverse end The elongated open that portion is edge limited,

The burner membrane of the form of-three-dimensional shells, it is along longitudinal edge and lateral end edges and metal Framework connects, and described burner membrane has:

-bubbler layer, it is made up and is formed outer combustion front of perforated metal, described bubbler layer with Single-curvature stretches out in the plane of frame part between two longitudinal edges,

-two enclosure portion being made up of metallic plate, it stretches out in frame part from lateral end edges Plane, and otherwise make the free end space-closed between burning zone and frame part.

This allows to be easier to landform by such as simply folding (around single axis) in press Become the perforated plate of bubbler layer, and partly (it is existing by using simple plate " connector (plug) " Required for having in technology the spherical cap being to form metal gauze) close the end regions of burner, Simplify the manufacture of three-dimensional films.

The structure of the combustion front being made up of perforated metal and single-curvature shape (thus hole does not deform) thereof Can produce high precision, constant and repeatably characteristic (permeability, distribution of weight, thermal capacity, Heat conductivity, mechanical strength, thermal expansion), this allows to better control over combustion parameter.

The structure of the whole Three-dimensional Combustion film of combustion front and metallic plate need not use expensive material, example Such as metal gauze or porous ceramic film material, and be easy to by the burner membrane be made up of metallic plate with by metallic plate The framework made connects.

In the range of present specification and claims, term " single-curvature " refer to plate, layer or Three-dimensional bending plane, around single axis or around multiple bendings paralleled to the axis or folding, is not result in Such as this plane of bending is relative to the deformation of original flat shape.Term " single-curvature " itself is not arranged Except the existence of flat site (unlimited radius of curvature), its can the most in an alternating fashion with bending area Combination is formed.

Accompanying drawing explanation

In order to be more fully understood that the present invention and understand its advantage, below with regard to accompanying drawing by unrestricted The mode of property example provides the description of multiple embodiments of the burner of the present invention, in accompanying drawing:

Fig. 1 is the top view of the burner according to an embodiment of the invention,

Fig. 2 is the axonometric chart of the burner in Fig. 1,

Fig. 3 is the partial front elevation view of the burner in Fig. 1,

Fig. 4 is the exploded view of the burner according to another embodiment,

Fig. 5 is in assembling the view of the burner in Fig. 4 of structure,

Fig. 6 shows the framework closing end with two burner membranes according to an embodiment,

Fig. 7 is the cross-sectional view of the burner according to another embodiment,

Fig. 8 shows the numerous embodiments of the bubbler layer of the burner seen in cross-section,

Fig. 9 shows the embodiment of the burner seen in longitudinal section.

Detailed description of the invention

With reference to accompanying drawing, the gas burner 1 for heater includes smooth metallic framing portions 2, Metallic framing portions has the elongated open 3 limited by two longitudinal edges 5 and two end edge 6 (such as extending along longitudinal axis 4), two longitudinal edges upwardly extend in the side of longitudinal axis 4, It is mutually facing that two end edge are crosscutting with longitudinal axis 4 each other, the most mutually facing each other.

Burner 1 farther includes the burner membrane 7 of three-dimensional shells form, and it is along longitudinal edge 5 He Transverse edge 6 is connected with frame part 2.Burner membrane 7 has bubbler layer 8, and bubbler layer is formed The outer combustion front 9 being made up of expanded metal, and with single-curvature between two longitudinal edges 5 from frame Stretch out in the plane 10 of frame part 2.In other words, the bubbler layer 8 being made up of expanded metal It is connected with two longitudinal edges 5, and prolongs from longitudinal edge as having single-curvature arch bridge on opening 3 Stretch.

Burner membrane 7 also has two enclosure portion 11 being made up of metallic plate, and two enclosure portion are from horizontal stroke Stretch out from the plane 10 of frame part 2 to edge 6, and make bubbler layer 8 and frame part 2 (and freely) end regions 12 between transverse edge 6 is closed.

This allow by such as in press (press) (around single axis) simple folding and relatively Simply form the perforated plate of bubbler layer 8, and by using simple plate " connector (plug) " portion (it is required for the spherical cap forming metal gauze in the prior art) is divided to close burner 1 End regions, simplify three-dimensional films 7 and manufacture and be formed as three-dimensional shells or box.

(thus hole 13 does not has for the structure of the combustion front 9 being made up of perforated metal and single-curvature shape thereof Have deformation) can produce high precision, constant and repeatably characteristic (permeability, distribution of weight, Thermal capacity, heat conductivity, mechanical strength, thermal expansion), this allows to better control over combustion parameter.

The structure of the whole Three-dimensional Combustion film 7 (including enclosure portion 11) of combustion front 9 and metallic plate is not Need to use expensive material, such as metal gauze or porous ceramic film material, and be easy to by metallic plate The burner membrane 7 made is connected with sheet metal frame 2.

According to an embodiment, have the bubbler layer 8 of the combustion front 9 being made up of metallic plate with There is on the cross section that longitudinal axis 4 is crosscutting the cross sectional shape of this form:

-arc (Fig. 8 a),

-circular arc (Fig. 8 b),

-the circular arc (Fig. 8 c) that tapers on the direction of framework or flatten,

-the arc (Fig. 8 c) that is made up of multiple bending sections with different curvature radius,

-be made up of one or more bending sections alternately and one or more flat segments arc (Fig. 8 d, Fig. 8 e),

-the arc (Fig. 8 h) that is made up of multiple straightways being mutually inclined,

-there is the arc (Fig. 8 d) of top section of smooth or straight line,

-there is the arc (Fig. 8 e, Fig. 8 f) of side sections of two relative smooth or straight lines,

-there is the side sections of two relative smooth or straight lines and the smooth or top section of straight line And the arc (Fig. 8 g) of the fillet section of two bendings being arranged between side sections and top section,

-waveform (Fig. 8 i).

In a preferred embodiment, there is the bubbler layer 8 of combustion front 9 along combustion front 9 Longitudinal extension part (that is, along longitudinal axis 4) has constant cross section, is similar to extruded shape Shape.

Therefore, the multiple possible 3D shape of the combustion front 9 being made up of metallic plate is possible:

-semicanal (half pipe), wherein, open angle α in the cross section of combustion front can be according to embodiment Change in reasonable limit, such as, 180 ° of +/-30 ° (Fig. 8 k),

-circular semicanal,

-the semicanal that tapers on the direction of framework 2 or flatten,

Or more generally, be the shape along longitudinal axis 4 with constant cross section, wherein, this Plant cross section to comprise the steps that

-one or more bending sections alternately and one or more flat segments,

-there are multiple bending sections of different curvature radius,

-there is the arc of top section of smooth or straight line,

-there is the arc of side sections of two relative smooth or straight lines,

-waveform shape.

According to an embodiment, enclosure portion 11 has wall 14 and folded edge 15, and wall is substantially Being smooth and transverse to frame part 2 plane 10, folded edge is by flat wall 14 and bubbler Layer 8 connects.

This is easy to manufacture enclosure portion 11 by press and guarantee the seriality of burner membrane 7, even if Also the seriality of burner membrane can be kept when there is thermal expansion.

The folded edge 15 of enclosure portion 11 can have the arcuate shape substantially phase with bubbler layer 8 The arcuate shape adapted to.

Enclosure portion 11 all can form the vertical (figure of substantially flat and with frame part 2 plane 10 2, Fig. 5, Fig. 6) wall 14.Or, smooth wall 14 can be relative to the plane of frame part 2 10 tilt (in a converging fashion, Fig. 9 a) towards opening 3, or putting down relative to frame part 2 Face 10 tilts (with separate mode, Fig. 9 b) away from opening 3.

Enclosure portion 11 and/or transverse edge 6 can include one or more folding part or ribs, example As projection, folding part or ribs can extend to enclosure portion from framework 2 by transverse edge 6 In 11 (Fig. 6).

It is therefore possible to prevent longitudinal thermal expansion of diffusion barrier 7 is irreversibly transmitted, and then prevent from closing Part 11 deforms and produces unexpected gas passage area.

According at least one and frame section in an embodiment, enclosure portion 11 and bubbler layer 8 2 are divided to be formed (Fig. 4, Fig. 6) by single metal plate.By at least one enclosure portion 11 or by two It is particularly advantageous that enclosure portion is all formed by single metal plate together with frame part 2, such as, logical Cross along opening 3 transverse edge 6 by enclosure portion 11 from the plane 10 of framework 2 fold (Fig. 4, Fig. 6).

Which save material and link cost, and add connection between burner membrane 7 and framework 2 Sealing.

In this embodiment, what the structure of folded edge 15 can include frame part 2 is positioned at longitudinal direction Edge 5 with the corner region medial end portions of transverse edge 6 at the otch 20 (Fig. 4, Fig. 5) of plate. These otch 20 can seal advantageous by local welding 21, and local welding is at bubbler layer 8 and frame Four irreversible fixing points are produced between frame 2.

Between the transverse edge 6 of enclosure portion 11 and framework, alternative fixing includes, such as, and weldering Connect, crimp (crimping), coordinate (fitting), gluing or folding.

Alternately or in addition, in enclosure portion 11 and bubbler layer 8, at least one is joined by elasticity Close and be connected with frame part 2, be preferably clasped.For this purpose it is proposed, at two by metallic plate system Forming locking groove 16 at least one in the parts become and forming edge 17 in another is to have Profit, this edge is suitable to be clasped or be usually located at (Fig. 7) in locking groove 16.

This cooperation can be by spot welding subsequently or seam welding complete, so that this connection is irreversible.

Burner membrane 7 (particularly bubbler layer 8) and frame part 2 can be formed by built-in edge 17 Between fixing, built-in edge stretches out from the outward flange (particularly from bubbler layer 8) of burner membrane 7, And be fixed to (such as, be soldered to, be crimped to, be engaged to, be glued to, clamp to) frame part The corresponding edge (particularly longitudinal edge 5) of 2.Built-in edge 17 can be by identical with burner membrane 7 (particularly bubbler layer 8) metallic plate is made, and such as, is bent by the peripheral edge margin making burner membrane And overlapping on the frame part 2 on combustion side 18, or the preferably frame section on feed side 19 Divide overlapping (Fig. 4) on 2, and do not allow fuel mixture pass through or form flame.Therefore, at this In description, in the definition of " bubbler layer 8 ", do not consider built-in edge 17.

Advantageously, bubbler layer 8 can be inserted the opening 3 of frame part 2 from feed side 19, So that built-in edge 17 and/or locking groove 16 engage with the longitudinal edge 5 of opening 3, and by end Lean against (Fig. 4) on the folded edge 15 of enclosure portion 11.

According to another embodiment, burner 1 includes in a desired manner towards bubbler Layer assignment The allotter 22 of fuel mixture.Allotter 22 includes that the metallic plate by having multiple through hole 23 is made One or more walls, and the internal layer (feed side 19) of burner membrane 7 can be formed, or can be formed with The parts that bubbler layer 8 separates.

Allotter 22 can be connected, preferably with frame part 2 or with bubbler layer 8 by resilient engagement Ground is to be clasped.For this purpose it is proposed, shape at least one in two parts being made up of metallic plate Becoming locking groove and to form edge in another be favourable, this edge is suitable to be clasped or generally It is positioned in locking groove.This is clasped can be by spot welding or seam welding subsequently complete, so that connecting not Reversible.

In one embodiment, burner 1 includes one or more folded projections, folded projections shape Become at least one parts or be formed in all parts (framework 2, bubbler layer 8, closure Points 11 or allotter 22), and folded projections and the one or more joints in described miscellaneous part with Lasting mode stops burner assembly 1.Allotter 22 may also include built-in edge 24, fixed edge Edge same or analogous mode in the way of describing with the built-in edge 17 with reference to bubbler layer 8 carrys out structure Make, and can insert from feed side 19 opening 3 of frame part 2 so that built-in edge 24 and/ Locking groove and opening 3 or the corresponding edge of burner membrane 7 engage (Fig. 4).

According to another embodiment, allotter 22 is formed by single metal plate together with bubbler layer 8. In this example, this metallic plate can be folded to form as arc from the plane 10 of frame part 2 The double-walled construction stretched out, and adjoining edge (Fig. 7) is formed further with frame part 2.

In a preferred embodiment, longitudinal edge 5 is straight line, parallel to each other and and burner The longitudinal axis 4 of the opening of 1 is parallel.Transverse edge 6 is also straight line, parallel to each other and preferably Vertical with longitudinal edge 5.Therefore, opening 3 has elongated rectangular shape.Enclosure portion 11 is excellent Selection of land does not has hole or air-locked, in specific implementation, it is also contemplated that in enclosure portion 11 Middle formation is bored a hole and flame.Whole burner membrane 7 is preferably without metal gauze or fabric.

Those skilled in the art can enter completely in the protection domain being defined by the claims The change of one step and change, to meet the particular demands decided as circumstances require.

Claims (13)

1. for the gas burner (1) of heater, including:

-smooth metallic framing portions (2), described frame part has by two longitudinal edges The elongated open (3) that edge (5) and two transverse edges (6) limit, described longitudinal edge Upwardly extend and the most relative in the side of the longitudinal axis (4) of described gas burner (1) Faced by and, described transverse edge is crosscutting with described longitudinal axis (4),

The burner membrane (7) of-three-dimensional shells form, described burner membrane is along described longitudinal edge (5) it is connected with described frame part (2) with described transverse edge (6), described burner membrane (7) have:

-bubbler layer (8), described bubbler layer is made up of perforated metal and forms external combustion Burning face (9), and described bubbler layer with single-curvature two described longitudinal edges (5) it Between stretch out in the plane (10) of described frame part (2),

-two enclosure portion (11) being made up of metallic plate, described enclosure portion is from described horizontal stroke The described plane (10) of described frame part (2) is stretched out in edge (6), and described Enclosure portion makes the end region between described bubbler layer (8) and described transverse edge (6) Territory (12) is closed,

Wherein, by folding two described enclosure portion (11) along described transverse edge (6) And described enclosure portion (11) and described frame part (2) are formed by single metal plate.

Gas burner the most according to claim 1 (1), wherein, has described combustion front (9) The cross sectional shape transverse to described longitudinal axis (4) of described bubbler layer (8) be selected from The group being made up of following shape:

-arc,

-circular arc,

-the circular arc that tapers on the direction of described frame part,

-the arc that is made up of bending section alternately and straightway,

-the arc that is made up of multiple bending sections with different curvature radius,

-the arc that is made up of the multiple straightways inclined towards each other,

-there is the arc of straight line top section,

-there is the arc of two relative straight sides sections,

-there is two relative straight sides sections and straight line top section and be arranged in described side The arc of two curved radius sections between section and described top section,

-waveform.

Gas burner the most according to claim 1 (1), wherein, has described combustion front (9) Described bubbler layer (8) along the longitudinal extension part of described combustion front (9), there is perseverance Fixed cross section.

Gas burner the most according to claim 1 (1), wherein, described enclosure portion (11) Formed:

-wall (14), described wall is generally flat and transverse to described frame part (2) Described plane (10), and

-folded edge (15), described folded edge by smooth described wall (14) with described Bubbler layer (8) connects, and described folded edge (15) has and described bubbler layer (8) The arcuate shape that substantially adapts of arcuate shape.

Gas burner the most according to claim 1 (1), wherein, each described enclosure portion (11) be respectively formed wall (14), described wall be generally flat and with described frame part (2) Described plane (10) vertical.

Gas burner the most according to claim 1 (1), described gas burner includes one Or multiple ribs, described ribs from described frame part (2) by described transverse edge (6) extend in described enclosure portion (11).

Gas burner the most according to claim 1 (1), wherein, described burner membrane (7) Formed by single metal plate together with described frame part (2) at least partially.

8. according to the gas burner (1) described in claim 4 or 7, wherein, described frame part (2) be positioned at described longitudinal edge (5) at the corner region with described transverse edge (6) In the otch (20) of end sealed by local welding (21), described local is welded It is connected between described bubbler layer (8) and described framework (2) and produces irreversible fixing point.

Gas burner the most according to claim 1 (1), wherein, described burner membrane (7) At least some of resilient engagement of passing through is connected with described frame part (2).

Gas burner the most according to claim 1 (1), described gas burner includes metal The allotter (22) that plate is made, described allotter has and is arranged in described bubbler layer (8) Feed side on multiple through holes (23), with by expection mode towards described bubbler layer (8) Distribution fuel mixture.

11. gas burners according to claim 10 (1), wherein, described allotter (22) It is connected with described frame part (2) or described bubbler layer (8) by resilient engagement.

12. gas burners according to claim 10 (1), wherein, described allotter (22) Formed by single metal plate together with described bubbler layer (8).

13. gas burners according to claim 9 (1), wherein, described resilient engagement is card Snap fit is closed.