JP2722676B2 - Evaporative burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a support for an absorber capable of supplying a liquid fuel via a fuel supply pipe reaches a combustion chamber, and the absorber is disposed on a front surface of the support, That is, a heating device using liquid fuel, particularly a vehicle, in which an ignition chamber is provided on a surface on the combustion chamber side, an ignition chamber is adjacent to a back surface of the support, and an ignition device is disposed in front of the back surface of the support in the ignition chamber. The present invention relates to an evaporative burner for an auxiliary heating device for vehicles.

[Conventional technology and its problems]

In the German Patent Application No. 37 13460.4, a prior application filed by the present applicant, an evaporative burner of the above kind is described.
In this case, an ignition device in the form of a rod-shaped glow plug is provided, which reaches the ignition chamber provided in front of the back of the absorber support. The absorber support extends axially toward the combustion chamber, and a combustion air supply port is provided in this area. The ignition device penetrates the surrounding case and is screwed to reach the ignition chamber. The outer wall of the ignition chamber surrounds the ignition device, and an intermediate chamber is formed between the outer wall and the ignition device. Not only must the threaded holes lead to relatively high costs due to the passage of the igniter through the case, but also additional costs are required to ensure that the combustion air area is sealed against the exhaust area. Such measures must be taken. In this case, it must be ensured that the exhaust does not leak to the atmosphere through a gap in the ignition device which acts as a starting device. Furthermore, the igniting and combustion processes are greatly impaired in the case of this type of evaporative burner, since irrelevant air flows through the gap. The absorber, preferably formed by fleece, forms a unit, since the absorber support forms, together with the adjacent ignition chamber and possibly other devices, such as a flame monitor, etc. When replacing, the entire unit must be disassembled and replaced with a new one. This results in high replacement parts and repair costs.

[Problems of the Invention] The present invention eliminates the above-mentioned problems, and can reliably perform sealing between the combustion air chamber and the combustion component and between the combustion air chamber and the atmosphere with a simple structure, Furthermore, it is an object of the present invention to provide an evaporative burner of the kind mentioned at the outset, in which the costs of repairs and replacement parts can be significantly reduced.

[Means for Solving the Problems and Effects of the Invention]

In the present invention, the support reaches the combustion chamber, an absorber capable of supplying liquid fuel via the combustion supply pipe is provided on the front of the support on the combustion chamber side, and the ignition chamber is adjacent to the back of the support. An evaporative burner for a heating device using liquid fuel, particularly an auxiliary heating device for a vehicle, in which an ignition device is arranged in front of a back surface of a support in a room, an ignition device is provided on a support member, and the support device is provided with an ignition device. The member is connected to the absorber support, and forms an ignition chamber.

The support member is preferably detachably connected to the absorber support.

In the case of the structure according to the invention of an evaporative burner, the igniter, such as a rod-shaped glow plug, is not guided outside through the case part surrounding the burner, but is arranged in its own support member. This support member simultaneously forms at least a part of the wall of the ignition chamber. Thereby,
In the case of the evaporative burner according to the invention, all the problems on the seals which have conventionally arisen in connection with the guide-through of the ignition device are eliminated. Therefore, in the case of such a structure, it is necessary to provide sealing means for a seal between the portion guiding the combustion air and the combustion component and a seal between the portion guiding the combustion air and the atmosphere. There is no. This is because exhaust gas does not leak to the surroundings from the combustion chamber and the ignition chamber. Further, evaporative burners are easy to maintain. This is because when the ignition device stops operating, the ignition device itself can be replaced without discarding the absorber support. The same is true when the absorber has to be replaced. This structural separation of the igniter support and the absorber support provides all of the above advantages in combination.

In order to ensure that the ignition device is located at the same position on the support member, the support member is provided with a holder for the ignition device, for example in the form of a recess. This recess can be formed in a shape adapted to the outer contour of the ignition device,
When the evaporative burner is installed, the ignition device remains in place. In the case of the evaporative burner according to the invention, since a threaded joint of the ignition device and a holder for the ignition device are not required, costly additional processing steps are omitted.

In the case of a preferred embodiment, the support for the absorber is formed in a pot shape, the support member for the ignition device is inserted into the support for the absorber formed in a pot shape, and at least a part of the wall of the ignition chamber. Is formed. Thereby, the support member for the ignition device and the support member for the absorber are formed in a structure that fits each other. This construction makes it possible to form the evaporative burner in a way that saves space, especially in the axial direction. Furthermore,
Since the igniter does not penetrate the case surrounding the burner head, the evaporative burner itself can be formed independently of the shape of the case and adapted to the respective intended use. Particularly in the case of a heating device, the length of the area of the burner head can be reduced. The ignition device can be adapted to the respective requirements regardless of the axial geometry.

In another preferred embodiment of the invention, the igniter support and the absorber support are removably fixedly connected to the combustion chamber. Thereby, in order to further reduce the length of the evaporative burner, the structure consisting of the support member for the ignition device and the support member for the absorber is arranged in relation to the combustion chamber and fitted in each other in the axial direction. I have.

The fuel supply pipe is preferably guided through the igniter support and is fixed to the absorber support. By guiding the passage through the fuel supply pipe in this way, during assembly,
It is possible to easily orient the components of the evaporative burners fitted and arranged in a predetermined direction.

In the case of the structure of the evaporative burner according to the present invention, since the parts are fitted to each other, fuel may leak from between the combustion chamber and the absorber support. Although a seal is provided to prevent leakage, there is no need to provide any other seal. Since the parts of the combustion chamber and the evaporative burner connected to it are formed as rotationally symmetric parts, the seal can be formed in a simple form,
For example, it can be formed by a seal ring. This seal ring is pressed against the outer peripheral surface of the combustion chamber at the time of assembling and at the time of connection between the evaporative burner and the combustion chamber, thereby ensuring a reliable seal.

In a preferred embodiment of the invention, the ignition device support is additionally provided with a flame monitoring device reaching the combustion chamber. This eliminates the need for the passage guide of the flame monitoring device, and does not cause a sealing problem based on the passage guide.
Of course, the support for the absorber is provided with a suitable passage for the flame monitoring device, so that the flame monitoring device can reach the combustion chamber and reliably perform its flame monitoring function. it can.

In order to simplify the electrical wiring of the electrical connection conductors for the ignition device and / or the flame monitoring device, the connection conductors are:
It extends from the back of the ignition device support, opposite the ignition chamber, and is guided to a suitable control device. Such an arrangement of the electrical connection conductors is possible in the case of the structure of the evaporative burner according to the invention. This is because the ignition device support member is provided in a relatively low temperature range of the burner head of the heating device.

In order to reduce the production costs, it is preferred that the igniter is permanently attached to a burner part, such as a support member, which is particularly easily replaceable. in this case,
The igniter can be fixed to the component by welding, brazing, or the like. At this time, a threaded guide or the like for fixing the ignition device to the heating device is omitted.

Another embodiment of the evaporative burner partially having the features of the above embodiment is characterized in that the igniter support member includes an igniter housing. This receiving part is preferably formed as a plug-in receiving part and is inclined with respect to the axial direction of the support member. The construction of the evaporative burner is particularly simple to fabricate. This is because, for example, an ignition device formed as a glow plug on a rod can be arranged on the support member by means of the housing. In this case, the ignition device can be exchangeably arranged on the support member at the time of the plug-in connection, so that only the ignition device needs to be exchanged at the time of repair. Furthermore, assembly is simple. This is because this support simultaneously serves as a closure in an evaporative burner.

In a variant of this embodiment of the evaporative burner, the support member comprises a spacer on its surface on the absorber support side. This spacer is preferably formed as a protrusion. In this case, the spacer holds the back surface of the absorber support at a distance from the facing surface of the support member, whereby an air cushion is provided between the support member and the absorber support for thermal insulation reasons. It is formed.

The support member preferably simultaneously serves as a holder and a fixing member for the combustion tube surrounding the combustion chamber. As a result, it is possible to dispense with additional connecting means between the support members and the combustion tube surrounding the combustion chamber.

In particular, it has been found that it is preferable to form the support member as a die-cast component made of aluminum. In the case of this structure, the weight of the support member is reduced. The support member can be formed so that the dimensions are stable and manufacturing errors are small. This is particularly advantageous in mass production.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the drawing, the evaporative burner is generally indicated by 1.
This burner has a tubular combustion chamber 3 of a heating device.
Has reached within. The heating device uses liquid fuel and is not shown in detail except for the burner. The evaporative burner 1 includes a support 4 for an absorber (absorbent) 5. The absorber is formed, for example, by a disk-shaped fleece. The support 4 for the absorber 5 is formed in a bowl shape, and has a bottom surface (back surface) 6. An absorber 5 is provided on the front face 7 of the support on the side of the combustion chamber 3. A pot-shaped outer peripheral portion 8 connected to the bottom surface 6 extends from the front surface 7 to a side opposite to the combustion chamber 3. The outer peripheral portion 8 and the bottom surface 6 of the support 4 for the absorber 5 form a part of an ignition chamber 9 provided in front of the support 4 for the absorber 5.

The side of the ignition chamber 9 opposite to the bottom surface 6 of the support 4 for the absorber 5 is closed by a support member 10 for an ignition device 11.
This ignition device is formed by, for example, a rod-shaped glow plug 12. The support member 10 has a recess 13. This recess preferably has a shape corresponding to the outer contour of the ignition device 11 and serves to orient and hold the ignition device 11 in the ignition chamber 9. A rod-shaped glow plug 12 serving as an ignition device 11 is mounted in the recess 13 without using a threaded protrusion. The electrical connection lead 14 for the ignition device 11 extends from a back surface 15 of the support device 10 for the ignition device 11 formed, for example, in a lid shape.

Similarly, as can be seen from FIG. 1, the support member 10 for the ignition device 11 is further provided with a flame monitoring device 16. The flame monitoring device reaches the combustion chamber 3 and serves to monitor the flame as usual. The support member 10 for the ignition device 11
It is formed so that the bottom surface supporting the 11 reaches into the ignition chamber 9 formed in cooperation with the pot-like support 4 for the absorber 5. In this case, in order to shorten the length of the evaporative burners 1 in the axial direction, they are configured to be fitted to each other in the axial direction (structures to be incorporated into each other).

The support 10 for the ignition device 11 is preferably detachably connected to the support 4 for the absorber 5 and the burner chamber 3. For this purpose, preferably, a tongue piece is provided that protrudes beyond the outer periphery of the burner chamber 3, the outer periphery of the support 4 for the absorber 5, and the outer periphery of the support member 10. This tongue has a through hole. The through-holes allow, in a straight line, the connection of mutually fitted components, for example by means of bolts.

In the case of the above-described structure of the evaporative burner 1, it is only necessary to provide one seal 17 for sealing. This seal is used for the liquid fuel to be supplied to the combustion chamber 3 and the support 4 for the absorber 5.
To prevent it from flowing out of the space. This seal
17 is preferably formed as a seal ring 18 provided on the outer peripheral surface of the peripheral part 8 of the support 4 for the absorber 5.
The peripheral part of the support preferably has an outwardly projecting peripheral edge for fixing the position of the seal ring 18. When the support 4 for the absorber 5 and the support member 10 for the igniter 11 are fixedly connected to the combustion chamber 3 using, for example, screws, the seal ring 18 is compressed, so that the combustion chamber 3 of the evaporative burner 1 is compressed. The outer periphery between the and the corresponding part is securely sealed.

As can also be seen from the figure, the electrical connection conductor 19 for the flame monitoring device 16 likewise extends from the back surface 15 of the support member 10 for the ignition device 11, so that it can be connected to the associated control device and power supply device. . The fuel supply pipe 20 passes through the support member 10 for the igniter 11 and is fixed to the support 4 for the absorber 5 in order to supply liquid fuel to the absorber 5. In order to prevent the absorber 5 from sliding in the axial direction on the front surface 7 side of the support 4, a plurality of projections 21 distributed around the periphery and reaching the inside of the combustion chamber 3 may be provided. This projection serves as a contact member for the absorber 5 when the components of the evaporative burner 1 are fixedly connected to the combustion chamber 3.

In the case of the evaporative burner 1 formed as described above,
As shown in the above embodiment, sealing problems are greatly reduced. This is because it is only necessary to provide one seal 17 in order to prevent the liquid fuel from flowing out. There is no need for a seal between the part of the evaporative burner 1 that guides the combustion air and the component for combustion, and also no seal between the chamber that guides the combustion air and the atmosphere. This is because the exhaust gas does not leak from the gap of the ignition device 11. Since the evaporative burner 1 has a specific support 10 for the igniter 11, which is optionally equipped with a flame monitor 16, the igniter 11 and possibly the flame monitor 16
Can be replaced independently of the support 4 for the absorber 5 and, if necessary, on the contrary, the absorber or the support can be replaced independently. This reduces repair and maintenance costs. Furthermore, the length of the evaporative burner 1 is shortened because the combustion chamber 3, the support 4 for the absorber 5, and the support 10 for the ignition device 11 are fitted to each other.

An ignition device 11 such as a rod-shaped glow plug is
(Not shown). This can be done, for example, by brazing, welding, or the like. The support member 10 to which the ignition device 11 is fixed can be easily removed in order to allow the ignition device 11 to be replaced in some cases.

FIG. 3 shows a modified embodiment of the evaporative burner 1 '. Parts which are the same as in the first embodiment described above and shown in FIGS. 1 and 2 are given the same reference numerals and are further provided with a "" (dash).

This second embodiment of the evaporative burner 1 'substantially differs from the first embodiment in the following points. That is, the supporting member 1 for the igniter 11 'that also houses and holds the flame monitoring device 16'
The difference is that 0 'is formed in particular as a die-cast part made of aluminum (in the case of the first embodiment, substantially made of a thin plate). Further, in the case of the evaporative burner 1 ', the support member 10' has a housing 22 formed integrally with the main body of the support member 10 ', in which a rod-shaped glow as an ignition device 11' is provided. The plug 12 'can be plugged in advantageously. Thereby, the rod-shaped glow plug 12 'is detachably connected to the support member 10' and can be replaced if necessary, for example, for repair.
As shown in FIG. 3, unlike the case of the first embodiment, the receiving portion 22 is not arranged perpendicularly to the center axis of the support member 10 ', but is inclined at a certain angle. . The free end of the ignition device 11 'extends into the ignition chamber 9'. This ignition chamber is formed as a hollow chamber in a part of the support member 10 '. Furthermore, the support member 10 'simultaneously serves as a closing lid and is formed to receive and hold a combustion tube 26 surrounding the combustion chamber 3'. With this structure, FIG. 1 and FIG.
Since the seal 17 such as the seal ring 18 in the illustrated embodiment can be omitted, problems associated with such a seal do not occur. At the same time, the manufacture of the support member 10 'is simplified. Further, the support member 10 'is provided on the surface on the absorber 5' side.
23 has a plurality of spacers 24. This spacer is distributed on the surface 23 and is preferably formed as a projection 25. With this spacer 24, the support 4 'for the absorber 5' is arranged at a distance from the support member 10 ',
Thereby, the support body and the support member are insulated from each other so as not to transfer heat to each other. Back 1 of support 4 'for absorber 5'
There is a third between the 5 'and the facing surface 23 of the support member 10'.
As can be seen from the lower half of the figure, an intermediate chamber is formed. This intermediate chamber acts as an air cushion for thermal insulation.

Compared to the first embodiment described with reference to FIGS. 1 and 2, the evaporative burner 1 'according to the embodiment of FIG. 3 is simpler in terms of manufacturing technology. As a result, the production cost, especially during mass production, can be reduced. Furthermore, the evaporative burner 1 'requires only a small installation chamber in its head space,
The shape of the support 4 'for the absorber 5' is simplified, and the support can be made as a unique part, for example by a thin plate. The support 4 'for the absorber 5' is positioned in the correct position with respect to the support member 10 'by means of a spacer 24 and the combustion tube
26 can also be arranged in a regular position.

It should be noted that the present invention is not limited to the illustrated preferred embodiments and the above-described matters, and that many changes and modifications can be made as needed by those skilled in the art without departing from the spirit of the present invention. In the case of the evaporative burners 1, 1 'according to the invention, a specific support 10 is provided for the igniters 11, 11', which at the same time partially blocks the ignition chambers 9, 9 '. It is important to surround. Thereby, many functions are integrated in the support members 10, 10 'for the igniters 11, 11', and this function is achieved in connection with the supports 4, 4 ', so that the evaporative burners 1, 1''Is a shape that saves a lot of space. In this case, in particular, the sealing problem which has conventionally occurred can be sufficiently solved. Thus, a reliable operation of such an evaporative burner 1, 1 'can be achieved.

〔The invention's effect〕

As described above, according to the evaporative burner of the present invention, the support member is detachably connected to the absorber support forming at least a part of the wall of the ignition chamber, and the ignition device is connected to the support member. , The need for a threaded hole or seal provided in connection with the penetration guide of the ignition device is eliminated, and since the absorber support and the support member can be separated, repair costs and Replacement parts costs can be significantly reduced.

In addition, since a seal ring is provided on the outer periphery of the support to seal the space between the support and the combustion chamber, the space between the combustion chamber and the combustion parts and the space between the combustion chamber and the atmosphere are sealed with a simple structure. can do.

[Brief description of the drawings]

FIG. 1 is a schematic axial sectional view of an evaporative burner mounted on a combustion chamber, FIG. 2 is a schematic exploded view of parts of the evaporative burner, and FIG. 3 is another embodiment of the evaporative burner. FIG. 2 is a schematic axial sectional view similar to FIG. 1 showing a state of being mounted on a combustion chamber. 1, 1 '... evaporative burner, 3, 3' ... combustion chamber, 4,
4 ... Support, 5, 5 '... Absorber, 6 ... Back, 7,
7 ': Front, 9, 9' ... Ignition chamber, 10, 10 ... Support member, 11, 11 'Ignition device, 20, 20 ... Fuel supply pipe.

Claims (21)

(57) [Claims] 1. An absorber support reaches the combustion chamber, and an absorber capable of supplying liquid fuel via a fuel supply pipe is provided on a front surface of the absorber support on the combustion chamber side. A heating device using liquid fuel, particularly an evaporative burner for an auxiliary heating device for a vehicle, in which an ignition chamber is formed on the back side and an ignition device is arranged on the rear side of the absorber support in the ignition chamber. An igniter (11; 11 ') is provided on the support member (10; 10'), and this support member serves as a support (4; 4 ') for the absorber (5; 5').
And a flame monitoring device (16; 16 ') is provided in the support member (10; 10') to reach the combustion chamber (3; 3 '). An evaporative burner, characterized in that: 2. The evaporative burner according to claim 1, wherein the support member (10) is provided with a recess (13) for holding and orienting the ignition device (11). 3. The evaporative burner according to claim 2, wherein the recess is shaped to match the outer contour of the ignition device. 4. The device according to claim 1, wherein the support member is detachably connected to the support for the absorber. Item 4. The evaporative burner according to any one of Items 3 to 7. 5. A support in which a support (4; 4 ') for an absorber (5; 5') is formed in a pot shape and a support member (10) for an ignition device (11) is formed in a pot shape. The evaporative burner according to claim 1, wherein the evaporative burner is inserted into the ignition chamber and forms at least a part of a wall of the ignition chamber. 6. The evaporative burner according to claim 1, wherein the ignition device is a rod-shaped glow plug. . 7. A supporting member (10; 1) for an ignition device (11; 11 ').
0 ') and the support (4; 4') for the absorber (5; 5 ') are detachably fixedly connected to the combustion chamber (3; 3'). The evaporative burner according to claim 6. 8. The fuel supply pipe (20; 20 ') includes an ignition device (11; 1).
2. The device according to claim 1, wherein the support is guided through a support for the absorbent body and is fixed to the support for the absorbent body. The evaporative burner according to any one of claims 1 to 7. 9. A seal (17) is provided between the combustion chamber (3) and the support (4) for the absorber (5) to prevent leakage of the liquid fuel. An evaporative burner according to any one of claims 1 to 8. 10. A seal (17) formed as a seal ring (18), said seal ring being mounted on the outer surface of a pot-like support (4) for an absorber (5).
The evaporative burner according to claim 9. 11. Electrical connection conductors (14,19; 1) for an ignition device (11; 11 ') and / or a flame monitoring device (16; 16').
4 ', 19') is a supporting member (10; 1) for the ignition device (11; 11 ').
0 '), the rear side (15; 15') opposite the ignition chamber (9; 9 ')
Claims 1 to 3 extending from
The evaporative burner according to any one of up to 10. 12. The evaporative burner according to claim 1, wherein the igniter is removably mounted on the burner component (10). 13. The evaporative burner according to claim 12, wherein the igniter is mounted on the support member (10). 14. The evaporative burner according to claim 12, wherein the ignition device is welded or brazed to the burner part. 15. The igniter (11 ') support member (10') has an igniter (11 ') housing (22). The evaporative burner according to claim 11. 16. The evaporative burner according to claim 15, wherein the housing is formed as a plug-in housing. 17. The device according to claim 17, wherein the receiving portion is disposed so as to be inclined with respect to the axial direction of the support member.
17. The evaporative burner according to claim 15 or 16. 18. A support member (10 ') on its side (23) on the side of the support (4') for the absorber (5 ') for the support (4') of the absorber (5 '). 18. The evaporative burner according to claim 15, further comprising a spacer (24). 19. The evaporative burner according to claim 18, wherein the spacer (24) is formed as a protrusion (25). 20. The combustion tube surrounds the combustion chamber, and the support member (10 ') simultaneously serves as a holding and fixing member for the combustion tube (26) surrounding the combustion chamber (3'). 20. The evaporative burner according to any one of claims 15 to 19, characterized in that: 21. The evaporative burner according to claim 15, wherein the support member (10 ') is formed as a die-cast component, in particular made of aluminum.