JPH0379604B2 - - Google Patents

Abstract

Radiant-tube gas-operated heater. Gas burner unit for radiant tube heater, of the type comprising a burner group (12) arranged on a casing (10) delimiting a mixing and combustion chamber (14) extended by a sleeve (16) for connection of a radiant tube, characterised in that: the casing (10) forms a flange (15) for mounting a support case (11), and comprises in its mixing and combustion chamber (14) a centring crossmember (23), the case (11) comprises a chamber (44) for admission of primary air and a protection compartment (45), and the burner group (12) comprises a support (48) bearing a feed electrovalve (49) and a burner (62) which has a combustion head (24) which is centred and supported by the crossmember. Application in heaters with pin-type tube. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a radiant tube heating device that burns and uses combustion gas drawn from a main supply path as a heating energy source.

In this specification, the term radiant tube heating device includes all types of known constructions using continuous tube systems, but the present invention applies to heating devices having a single unit construction of the type using U-tubes. Particularly preferred is the application.

Devices of the above type have a burner block which provides several functions simultaneously.

The first function is to support the burner itself together with the working parts.

The second function is to ensure the supply of combustion air for the burner.

The third function is to provide a connection with the tube from which the burner flame is released.

BACKGROUND OF THE INVENTION Due to the structural design of currently known burner units, it is not possible to disassemble and reassemble the burner unit for maintenance or replacement of parts, and in particular protection to prevent the flame from returning to the gas supply system. The problem is that only a part of the functions mentioned above can be carried out, since no means or devices for control and regulation of the burner are provided.

Another problem with known burner units is that they are unsuitable for insulating secondary air at an air temperature range suitable for good combustion.

A further problem is that the U-tube heating system is structurally unsuitable for providing the minimum volume of combustion and exhaust necessary to reach optimal operating conditions.

(Problems to be Solved by the Invention) An object of the present invention is to solve the above-mentioned problems by providing a new burner unit that is simple in structure and easy to install. The burner unit of the invention is compatible with independent functional parts, which can be combined and adapted for operation to form a burner unit that can be easily installed and directly adapted to gas heating installations. It is possible to do so.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the burner unit according to the present invention has the following features.

The casing has a flange for attaching a support housing and includes a cross-shaped lattice within the mixing and combustion chamber to form an air supply circuit.

A protective wall is provided in the housing which divides the housing into a primary air supply chamber and a safety chamber.

The burner assembly includes a support adapted to the housing, the support supporting a solenoid-operated supply valve on one side within the safety chamber and a burner on the other hand with respect to the supply valve, said burner intersecting the firewall. The burner head extends centrally into the primary air supply chamber and into the mixing and combustion chamber and is centrally supported by a cross-shaped lattice.

Various other features will become apparent from the following description of the accompanying drawings.

(Example) Figure 1 shows a burner unit 2 and a reflector 4.
1 shows a heating device 1 comprising a radiant tube 3 linked to a radiant tube 3. In the illustrated embodiment, the radiation tube 3 consists of a radiation tube outward path section 5 and a radiation tube return path section 6, from which combustion gas is mechanically exhausted. Although the invention is at least partially applicable to heating devices comprising continuous pipes, the continuous pipes do not necessarily have to be U-shaped.

In all cases, the heating device is adapted to be held at a certain height in the environment to be heated by means of suspension 7.

The burner unit 2 is constituted by a casing 10 which, in conjunction with a support housing 11, supports a burner assembly 12 which is connected to a main compressed combustion gas supply line 13.

As shown in FIGS. 2 to 5, the casing 10
is a flange 15 for attaching the housing 11
The mixing and combustion chamber 14 is constructed to form an open mixing and combustion chamber 14. This mixing/combustion chamber 14 is preferably extended on the side facing the flange 15 by a connecting sleeve 16 of the radiant tube, into which the radiant tube outgoing section 5 slides and engages, and by suitable means, e.g. a pressure screw 18. It is locked on the axis by etc.
The casing 10 forms a secondary air supply chamber 19 having a supply port 20 open at a flange 21 to which a lattice filter (not shown) is attached to the side of the mixing/combustion chamber 14 . Preferably, the secondary air supply chamber 19 has an air supply port 2 located a little distance from the point where the secondary air is supplied by the air supply port 20.
2 is provided. Furthermore, preferably, the air inlet 22 is also provided with a lattice-shaped filter, which is open in the direction of sucking in hot air, and is therefore arranged at least in the vicinity of the connecting sleeve 16 . The secondary air supply chamber 19 is connected to the mixing/combustion chamber 14 at the level of the plane of the flange 15 .

The mixing and combustion chamber 14 is constructed to include a cross-shaped lattice 23 for centering and supporting the combustion head 24 of the burner assembly 12. The lattice 23 is constituted by a winglet member 25 which extends radially from the inner circumferential wall of the mixing/combustion chamber 14, terminates midway at intervals, and is arranged at the center of the connecting sleeve 16. It forms a pedestal.

Furthermore, an opening 26 is provided in one wall of the casing 10 into which an ignition electrode 27 is inserted. The ignition electrode 27 is connected to the combustion head 2 as shown in FIG.
towards the front of the ignition ring 28 provided by 4, which is arranged downstream of the combustion head 24 within the combustion chamber section of the mixing and combustion chamber 14.

As shown in FIG. 4, especially when applied to a heating device using a U-shaped radiant tube, the casing 1
0 is preferably constructed to support a surrounding member 29 on the side of the mixing and combustion chamber 14. The surrounding element 29 is open at the flange 15 and is extended by a connecting sleeve 30 whose axis is parallel to the connecting sleeve 16 . The connecting sleeve 30 is formed by suitable means to fit the open end of the outgoing radiation tube section 6. The surrounding member 29 is adapted to at least partially surround, for example, a centrifugal evacuation device (not shown). At this end, the enclosing member 29 is spiral-shaped and is connected to a tube 31 which opens into the interface of the flange 21 via an outlet 32 . The surrounding member 29 is separated from the secondary air supply chamber 19 by a wall 33.
3 forms a strip member 34 on the plane of the flange 15 to be connected.

As shown in FIGS. 2 and 3, the housing 1
1 is preferably a case 40 made of a metal plate having a raised end 41 attached adjacent to the flange 15 by means 42 such as screws. At least one of the top and bottom surfaces of the case 40 is open, and includes a firewall 43 inside.
The fire wall 43 allows the case to have a primary air supply chamber 44 communicating with the surrounding environment through an opening provided in the wall.
and a safety partition 45. In a U-type designed structure, the case 40 further includes a separating wall 46 cooperating with the strip member 34. A second partition 47 is formed within the case 40 by the separation wall 46, and the exhaust system and its operation control device are stored in the partition 47.

The housing 11 supports a burner assembly 12 which is provided with a support 48 for mounting a solenoid supply valve connectable with the main supply channel 13. The support body 48 is the case 40
A fixing plate 50 is provided on the rear wall 51, and the front wall 52 cooperates with the fire wall 43 to close the opening 53 of the fire wall 43.

A nozzle holding adapter 54 that passes through an opening 53 of the firewall 43 is supported on the front wall 52 by a support 48 . The adapter 54, shown in more detail in FIG. 6, is equipped with a removable injection port 60 and has an internal pressure measuring socket 61. The adapter 54 serves as a mounting base for a burner 62 having a cylindrical body. The burner 62 forms, from an end member 63 in contact with the adapter 54, a cylindrical portion 64 provided with a primary air intake hole 65 facing the air supply chamber 44. The cylindrical portion 64 extends into a tapered portion 66 which in turn extends into a wide portion 67 that allows the combustion head 2 to be centrally supported by the cruciform lattice 23.
Facing 4. A removable annular member 68 is provided on the outside of the combustion head 24, and an ignition ring 28 is formed in the annular member 68, which is an annular hole parallel to an axis that communicates with a gap 70 between the combustion head 24 and the cylindrical body. ing. Furthermore, a series of radiation holes 71 communicating with the cavity 70 are provided inside the cylindrical frame. The radial hole 71 is bored in the cylindrical body at a position upstream from the annular end 72, and the annular end 72 is formed inside the cylindrical body by a removable liner 73.

When the combustion gas is compressed and supplied from the injection port 60,
Primary air is drawn in and becomes a combustion mixture with gas,
It circulates within the cylindrical body of the burner 62 in the direction f1. A portion of this primary air/gas mixture impinges on the annular end 72 and branches through the radial hole 71 into the cavity 70 and is carried to the ignition ring 28 surrounding the opening of the head 24. As shown in FIG. 5 and as can be seen from the above description, electrode 2
7 is arranged adjacent to the ignition ring 28,
The primary air/gas mixture dissipated from the ignition ring 28 at relatively low pressure can be ignited. The above ignition process allows ignition of a high pressure combustion flame by the main stream primary air/gas mixture moving within the cylindrical body of the burner 62 and exiting from the opening of the combustion head 24.

At the burner outlet, this compressed gas flame is fed with secondary air which is supplied from the mixing and combustion chamber 14 in conjunction with the air supply chamber 19 . Varying and controlling the pressure of the combustion gases can be carried out in particular by operating a solenoid supply valve using the pressure socket 61.

From the above description, it can be seen that the burner unit according to the invention is particularly simple in construction, since it uses a main casing which forms the various chambers, enclosing elements, connecting sleeves and centrally arranges the burner and the exhaust device. be understood.

(Effects of the Invention) The casing designed in this manner includes a primary air supply chamber 44 and a partition chamber 45 that is insulated via a firewall 43 in which an open passage 53 is formed by a front wall 52. It holds the housing 11 and is adapted to the housing. The special function of supporting and delimiting each chamber is thus provided by a case of simple construction, for example made simply by folding metal plates.

The casing 10 provides support and quick mounting of the burner assembly 12, which is mounted from the rear wall 51 and has centering means operating between the fixing plate 50, the burner head 24 and the cruciform lattice. and can be adapted by The burner assembly 12 is made up of parts that can be completely disassembled, allowing quick cleaning, adjustment, and parts replacement.

The casing 10 serves a dual function when used in a U-tube type device. This is because the case forms an air supply circuit for primary air and secondary air with a separation wall 46 and isolates a second partition 47 for the exhaust system, and this separation wall 46 prevents the risk of flame return. Sexuality is avoided.

The invention is not limited to the illustrated embodiment, but various modifications are possible within the scope of the claims.

[Brief explanation of drawings]

FIG. 1 is an external view of a radiant tube heating device equipped with a burner unit according to the present invention, FIG. 2 is an enlarged sectional view taken along the - line plane in FIG. 1, and FIG. 2, FIG. 4 is a side view taken along the line - in FIG. 3, and FIG. 5 is a partial sectional view taken along the line - in FIG. 2; FIG. 6 is an enlarged sectional view showing in detail the structure of one component shown in FIG. 2. FIG. 1... Heating device, 2... Burner unit, 3
... Radiation tube, 4 ... Reflector, 5 ... Radiation tube outward path section, 6 ... Radiation tube return path section, 7 ... Hanging means, 1
0...Casing, 11...Housing, 12...
... Burner assembly, 13 ... Compressed combustion gas main supply path, 14 ... Mixing/combustion chamber, 15 ... Flange, 16 ... Connection sleeve, 18 ... Pressure screw,
19... Secondary air supply chamber, 21... Flange,
22... Air supply port, 23... Lattice, 24... Combustion head, 25... Winglet member, 26... Opening, 27
...Ignition electrode, 28...Ignition ring, 29...
Surrounding member, 30... connection sleeve, 31... pipe,
32...Exhaust port, 34...Strip member, 40
... Case, 41 ... Upper end, 42 ... Screw means, 43 ... Fire wall, 44 ... Primary air supply chamber, 45 ... Safety partition, 46 ... Separation wall, 4
7... Second partition, 48... Support, 50...
Fixed plate, 51... Rear wall, 52... Front wall, 53...
Opening, 54...Adapter, 60...Injection port, 61
...Internal pressure measurement socket, 62...Burner, 63
... End member, 64 ... Cylindrical part, 65 ... Primary air intake hole, 66 ... Tapered part, 67 ... Wide part, 68
...Annular member, 70...Void, 71...Radiation hole,
72... Annular end portion, 73... Liner.

Claims (1)

[Claims] 1. A casing having a mixing/combustion chamber inside, a connecting sleeve at one end, and a mounting flange at the other end;
A centering cross-shaped lattice provided in the mixing and combustion chamber of said casing, a radiant tube connected to a connecting sleeve of said casing, a chamber attached to a mounting flange of said casing and connected to the casing by a firewall for primary air flow. A housing in which the other chamber is divided into an air supply chamber and a safety partition is installed in the casing and the housing, and the burner head provided at the tip is supported by the cross-shaped lattice of the mixing/combustion chamber, and the A heating device having a radiant tube, the solenoid-type supply valve at the end being supported in a safety compartment of the housing, and a burner assembly having a burner portion supported in the primary air supply chamber of the housing. Gas burner unit for. 2 The casing has a second casing adjacent to the connecting sleeve.
A connecting sleeve is provided, and the distal end of the extension of the outgoing radiation tube section connected to the connecting sleeve is formed in the inward path section of the radiation tube, and is connected to the second connecting sleeve and an exhaust gas communicating with the second connecting section. 2. A gas burner unit according to claim 1, further comprising a port. 3. The gas burner unit according to claim 1 or 2, wherein the casing is formed with a secondary air supply chamber that opens toward the mixing/combustion chamber. 4. Claims 1 to 3, characterized in that the casing is provided with a secondary air supply port that opens at least near the outgoing radiation pipe section in relation to the secondary air supply chamber. The gas burner unit described in any of paragraphs. 5. The casing includes an interface forming a second mounting flange, and an exhaust port communicating with the secondary air inlet and the second connection sleeve opens into the interface. Claims 1 to 4
The gas burner unit described in any of paragraphs. 6. Any one of claims 1 to 5, characterized in that the casing includes one in which a cross-shaped lattice for centering formed in the mixing/combustion chamber is constructed of small wing members extending radially. The gas burner unit described in . 7. Claim 1, characterized in that the casing is provided with an opening for attaching an ignition electrode provided in the mixing/combustion chamber so as to face the ignition ring of the burner head and be located downstream of the cross-shaped lattice. 6. The gas burner unit according to any one of Items 6 to 6. 8 the casing has a flange adapted to the housing and separates the primary air supply chamber from the second connecting sleeve by a partition wall provided in the casing;
8. The gas burner unit according to claim 1, further comprising a second partition for mounting and protecting the exhaust device. 9 The burner is composed of a cylindrical frame, and has a cylindrical part provided with a primary air intake opening into the primary air supply chamber from an end member fitted with a nozzle holding adapter, and a cylindrical part adjacent to the cylindrical part. 2. The gas burner unit according to claim 1, wherein a tapered part and a wide part extend from each other, and a burner head for holding an ignition ring is formed at the tip. 10 The ignition ring is constituted by an annular hole adjacent the outer periphery of the burner head, said hole having a series of radial holes in the annular portion that open into a cavity formed by an annular member connected to the cylindrical portion of the burner. 10. The gas burner unit according to claim 9, wherein the gas burner unit is provided further upstream. 11. The burner extends from an adapter mounted on a support, said support comprising a wall portion cooperating with a fire wall of the housing and a fixing plate of the housing. The gas burner unit described in .