EP2063177B1 - Cutting torch with a burner head accepting an exchangeable nozzle - Google Patents

Description

The invention relates to a cutting torch with a burner head, which accommodates an exchangeable cutting nozzle, according to the preamble of claim 1.

In a known cutting torch with one-piece, gas-mixing nozzle, a burner tip is surrounded by a sleeve. These two parts are firmly connected to each other by means of a finely threaded thread and sealed against each other ( US Pat. No. 2,897,884 ). Through a central channel in the burner tip of the cutting zone oxygen can be supplied. Fuel gas is passed through channels outwardly formed from the burner tip, which tapers conically over a portion, to an opening of the burner tip. The burner tip is connected to the burner head via metallic seals, for which purpose the burner tip is provided with cone-shaped sealing surfaces. To replace the burner tip, which is desirable because of wear or to use a differently configured burner tip or cutting nozzle, the sleeve must be unscrewed and screwed again after inserting the new burner tip close to the burner head, which should be done carefully and can be cumbersome.

In order to facilitate a lighter nozzle change, in particular of the cutting nozzle, it is already known to coaxially surround a cutting nozzle receptacle into which the cutting nozzle protrudes with an annular gap-shaped heating nozzle receptacle and to insert the heating nozzle into this heating nozzle receptacle ( DE 101 44 177 B4 ). For this purpose, the heating nozzle should have an outer jacket, which is provided at the upper end with a first O-ring as a sealing ring, which bears sealingly against the Heizdüsenaufnahme. Specifically, an outer peripheral groove for the first O-ring is provided at the upper end of the outer shell, which sealingly bears against the inner wall of an annular groove in the burner head. A circumferential outer collar is provided downstream of the first O-ring, the upper side of which in the assembled cutting torch lies directly against a downwardly directed annular surface of the burner head. At the bottom of the outer collar engages a fixed to the burner head coupling. A second O-ring abuts against the outer jacket of the heater nozzle and at the bottom of the outer collar, which is urged upwardly against the burner head by the coupling engaging the outer collar to connect the burner head to the cutting nozzle and the heating nozzle encompassing it. The cutting torch is structurally complex. To change the nozzle between the heating nozzle and the clutch a loose connection should be made, which should prevent the disengagement of the heating nozzle from the inner bore of the clutch when releasing the clutch from the burner head. For this purpose, a Umfangseinfräsung is provided on the outer surface of the heating nozzle, in which a third O-ring is inserted, which is intended to engage in an inner groove in the coupling, so that the heating nozzle and the coupling can only be separated against the resistance of the third O-ring. The nozzle change is cumbersome because first the cutting nozzle and the heating nozzle are to be connected to the coupling before the assembled aggregate can be attached to the burner head.

According to WO 03/023278 A1 which, in addition to the above prior art, has a further development ( FIG. 6 ) discloses, as a coupling or quick release a bayonet closure is provided. According to the preamble of present claim 1, this is a cutting torch with a burner head is known, which receives a replaceable cutting nozzle, which is encompassed by an axial through-hole having a cap-like Heizdüsenanordnung. An outer jacket of the cutting nozzle is provided with longitudinal slots which extend upstream from a lower end of the cutting nozzle and serve to supply a fuel gas-oxygen mixture to a Heizdüsenaustritt. Cross sections of the axial through-hole of the heating nozzle assembly are narrowed in an area between its upper upstream end and its nozzle outlet inside. The cutting nozzle may be positioned with a stepped tapered lower portion in the cap-like heater nozzle assembly. In the burner head, a cutting nozzle receptacle is formed, which receives an upper cylindrical portion of the cutting nozzle. This upper section of the cutting nozzle carries an O-ring that fits snugly against the cutting nozzle receptacle of the torch head. At an upper portion of the cap-like Heizdüsenanordnung inside at least a first connection element of the quick release is fixed, which is releasably connected to at least a second connecting element of the quick release in the form of screw heads, which is fixed to a lower outer shell portion of the burner head. On an outer jacket of the heating nozzle, as in the heating nozzle discussed above, an O-ring is mounted in an encircling groove on an upper end of the outer jacket, which sealingly bears against the inner wall of an annular groove in the burner head.

The present invention has for its object to provide a cutting torch according to the preamble of claim 1, wherein the nozzle change with straightforward technical means quickly handled and yet reliable.

For this purpose, the cutting torch according to the invention has the combination of the features specified in claim 1. The feature of the cap-like heating nozzle is specified in claim 2.

An advantageous variant of the cap-like Heizdüsenanordnung is specified in claim 3.

In each of the two above cases, a nozzle quick change system is provided which allows a change of the cutting nozzle and the heating nozzle on the burner head without tools very quickly. The nozzle change can thus be efficiently automated.

The required during operation of the cutting torch contact pressure of the heating nozzle to the burner head is expediently realized by the surface pressure of an O-ring in the vertical direction according to claim 1 by a lower outer shell portion of the burner head has a first annular bearing surface which is perpendicular to the central axis of the cap-like Heizdüsenanordnung and an upper portion of the cap-like heating nozzle has an inwardly projecting second annular bearing surface which is perpendicular to the central axis of the cap-like heating nozzle assembly and which faces the first annular bearing surface, wherein an O-ring is interposed between the first annular bearing surface and the second annular bearing surface is. This threadless seal is favorable for the automated nozzle change. With this seal and the arrangement of the fasteners of the quick release in the cap-like Heizdüsenanordnung the fasteners are protected against mechanical damage and contamination.

The provided for changing the nozzle quick release can be realized in a first embodiment according to claim 4 by at least one dowel pin protruding from a lower outer shell portion of the burner head, and by at least one bayonet groove in the upper portion of the cap-like heating nozzle or the outer cap, in which bayonet the Engaging pin engages.

In a second embodiment of the quick release is a particularly reliable connection of the heating nozzle and the cutting nozzle with the Torch head according to claim 5 realized by the fact that protrude from the lower outer shell portion of the burner head two dowel pins on the outside diametrically opposite, and that inside the upper portion of the cap-like heating nozzle two bayonet grooves are arranged at diametrically opposite locations, in which engage the dowel pins. Thus, a tilting moment is avoided on the heating nozzle and the tightness over the entire circumference of the burner head and the heating nozzle is promoted.

Both the first embodiment and the second embodiment of the quick release require no expensive locking mechanisms that would be operated at a nozzle change.

As production-favorable, the bayonet groove or bayonet grooves are formed from a fixing body, which is fixed in the upper portion of the cap-like heating nozzle according to claim 6.

It is expressly understood that the arrangement of the dowel pins and the bayonet grooves on the burner head or on the cap-like heating nozzle can also be reversed, while maintaining the same quick-change facility.

In both the first embodiment and the second embodiment of the quick release, when dimensioning the bayonet groove (s) according to claim 7 up to a quarter of the inner circumference of the upper portion of the cap-like heating nozzle or the outer cap, the cap-like heating nozzle or the outer nozzle for nozzle change by a quarter turn manually without tools are released from the burner head, the cutting nozzle can be easily pulled out. Analogously vice versa, the attachment of the cutting nozzle and the heating nozzle on the burner head by attaching these two parts from below under application of sufficient contact pressure and a quarter turn in the opposite sense as to To solve. The dimensioning of the bayonet groove (s) according to claim 7 promotes a rapid change of cutting nozzle and / or heating nozzle both manually and automatically, especially in automated cutting in conjunction with flame cutting machines and / or cutting robots.

In another embodiment of the closure according to claim 8, a lower outer shell portion of the burner head is provided with an external thread, and an upper portion of the cap-like heating nozzle has an internal thread, which fits into the external thread of the burner head. The thread has a sufficiently large pitch for quick change, which is possible by arranging an O-ring according to claim 1 between the burner head and the heating nozzle.

The same advantageous measures as claimed in claim 8 can be provided in another embodiment of the cutting torch with an outer cap according to claim 9.

As noted above, the cutting torch according to the invention can be realized according to claim 2 with a cap-like Heizdüsenanordnung, which is a cap-like heating nozzle. In this case, at least the first connecting member of the quick-acting fastener is fixed to the upper portion of the cap-like heating nozzle and the upper portion of the cap-like heating nozzle has the inwardly projecting second annular bearing surface opposite to the first annular bearing surface on the outer shell portion of the burner head. The cap-like heating nozzle can be one-piece and therefore particularly low-priced and robust.

But it is also possible to carry out the invention with a cap-like Heizdüsenanordnung comprising according to claim 3, an outer cap and a heating nozzle, which is interchangeable inserted into the outer cap. In a Heizdüsenwechsel thus the outer cap does not need to be replaced. Rather, it may be sufficient to replace the more abrasive heating nozzle.

In this composite cap-like Heizdüsenanordnung the first connection element of the quick release, which cooperates with the second connecting element on the lower outer shell portion of the burner head, fixed to the outer cap inside. The first annular bearing surface on the lower outer shell portion of the burner head in this case only indirectly opposite second annular bearing surface, which is formed from the outer cap, supports a collar at an upper portion of the heating nozzle. On the collar a sealing bearing surface for the O-ring is formed, which is thus arranged between the first bearing surface and indirectly the second bearing surface.

The materials constituting the heating nozzle on the one hand and the outer cap on the other hand may be selected according to the requirements of these constituents of the cap-like heating nozzle arrangement, e.g. for the heating nozzle copper and for the outer cap steel.

The seal of the space formed in the heating nozzle to the outside could be further secured in all embodiments by each of a cylindrical sealing surface according to claim 9 is formed on the lower portion of the burner head and inside of the upper portion of the cap-like heating nozzle or the outer cap, wherein preferably according to claim 10, an O-ring between the two cylindrical sealing surfaces is arranged.

The insertable into the cutting nozzle receiving cylindrical upper portion of the cutting nozzle preferably carries according to claim 11, two O-rings in the axial distance, which not only the sealing of the cutting nozzle or the cutting oxygen channel is improved, but also the cutting nozzle is axially aligned in the cutting nozzle holder.

Figur 1

einen Ausschnitt eines ersten Ausführungsbeispiels eines Schneidbrenners, der eine kappenartige Heizdüse ausweist, im zusammengesetzten Zustand in einer ersten Ebene, in der die vertikale Mittelachse liegt, geschnitten,

Figur 2

den Schneidbrenner gemäß Figur 1, jedoch in einer zweiten Ebene, in der die vertikale Mittelachse liegt und die um 90° gegenüber der ersten Ebene gedreht ist, geschnitten,

Figur 3

die Schneiddüse des Schneidbrenners gemäß Figur 1 in größerer Darstellung in einer Seitenansicht,

Figur 4

die kappenartige Heizdüse des Schneidbrenners gemäß Figur 1, ebenfalls in größerer Darstellung, in einer Seitenansicht bzw. in einem Teilschnitt durch die vertikale Mittelachse,

Figur 5

eine zweite Ausführungsform eines Schneidbrenners, der eine kappenartige Heizdüse aufweist, im zusammengesetzten Zustand in einer ersten Ebene, in der die vertikale Mittelachse liegt, geschnitten,

Figur 6

den Schneidbrenner gemäß Figur 5, jedoch in einer zweiten Ebene, in der die vertikale Mittelachse liegt und die um 90° gegenüber der ersten Ebene gedreht ist, geschnitten,

Figur 7

eine dritte Ausführungsform eines Schneidbrenners, der eine Außenkappe und eine Heizdüse als kappenartige Heizdüsenanordnung umfasst, in einer Ebene, in der die vertikale Mittelachse liegt, geschnitten, und

Figur 8

eine ähnliche kappenartige Heizdüsenanordnung wie diejenige in dem Schneidbrenner in Fig. 7, jedoch in größerer Darstellung und freigestellt.

Embodiments of the invention are described below with reference to a drawing with eight figures, from which further details may result. It shows:

FIG. 1

a section of a first embodiment of a cutting torch, which identifies a cap-like heating nozzle, in the assembled state in a first plane in which lies the vertical center axis, cut,

FIG. 2

the cutting torch according to FIG. 1 but in a second plane in which the vertical central axis lies and which is rotated by 90 ° with respect to the first plane, cut,

FIG. 3

the cutting nozzle of the cutting torch according to FIG. 1 in a larger view in a side view,

FIG. 4

the cap-like heating nozzle of the cutting torch according to FIG. 1 also in a larger view, in a side view or in a partial section through the vertical central axis,

FIG. 5

a second embodiment of a cutting torch having a cap-like heating nozzle, in the assembled state in a first plane in which lies the vertical center axis, cut,

FIG. 6

the cutting torch according to FIG. 5 but in a second plane in which the vertical central axis lies and which is rotated by 90 ° with respect to the first plane, cut,

FIG. 7

a third embodiment of a cutting torch comprising an outer cap and a heating nozzle as a cap-like Heizdüsenanordnung, in a plane in which the vertical center axis is located, cut, and

FIG. 8

a similar cap-like heating nozzle arrangement as that in the cutting torch in Fig. 7 , but in a larger scale and optional.

In the Figures 1 - 4 1 denotes the cutting nozzle and 2 the cap-like heating nozzle of a cutting torch. The illustrated lower portion of the burner head bears the reference numeral 3.

How out FIG. 1 can be seen, a fixing 5 is fixedly inserted in an upper portion 4 of the cap-like heating nozzle, from which the diametrically opposite two bayonet grooves 6, 7 are formed. The course of the bayonet groove 7 is in FIG. 4 shown in more detail. In each of the two bayonet grooves 6, 7 each engage a dowel pin 8, 9, which protrudes from a lower outer shell portion 10 of the burner head 3.

The bayonet connection is reliably held tightly and tightly by an O-ring 11 which is disposed between a first annular bearing surface 1 2 at the lower outer shell portion 10 of the burner head 3 and a second annular bearing surface 13 at an upper portion 4 of the cap-like heating nozzle 2.

Another O-ring 15 is located between a cylindrical sealing surface 16 on the cap-like heating nozzle 2 and a cylindrical sealing surface 17 on the lower outer shell portion 10 of the burner head third

The cutting nozzle 1 has, as best of FIG. 3 can be seen, two axially spaced O-rings 18, 19 on a cylindrical upper portion 20 which is inserted in the assembled state of the cutting torch in a cutting nozzle holder 21. The cutting nozzle 1 has in the lower conical sections outside longitudinal slots 22 which form fuel gas channels, which communicate with a nozzle chamber 23, the fuel gas or a fuel gas component through a line 24 is supplied. The cutting oxygen supply to a cutting zone occurs through the cutting oxygen conduit 25 and a central cutting oxygen channel 26 about the vertical center axis 27.

In the FIGS. 5 and 6 31 denotes the cutting nozzle and 32 denotes the cap-like heating nozzle of a cutting torch. A lower portion of the burner head bears the reference numeral 33.

In an upper portion 34 of the cap-like heating nozzle 32, a fixing body 35 is fixedly inserted, from which the diametrically opposite two bayonet grooves 36, 37 are formed. The course of the bayonet groove 37 corresponds to that of the bayonet groove 7 in FIG FIG. 4 , In each of the two bayonet grooves 36, 37 each engage a dowel pin 38, 39, which protrudes from a lower outer shell portion 40 of the burner head 33.

The bayonet connection is reliably held firmly by an O-ring 41 disposed between a first annular bearing surface 42 on the lower outer shell portion 40 of the burner head 33 and a second annular bearing surface 43 on an upper portion 34 of the cap-like heating nozzle 32. With the O-ring 41 in this arrangement, an interior of the cap-like heating nozzle 32 formed below the O-ring 41 is sealed.

Another O-ring is not required. Therefore, the cap-like heating nozzle 32 and the lower outer shell portion 40 of the burner head 33 can be made without cylindrical sealing surfaces in a favorable production.

The cutting nozzle 31 in turn, as in the embodiment in Figures 1 - 3 , two axially spaced O-rings 48, 49 on a cylindrical upper portion 50 which is inserted in the assembled state of the cutting torch in a cutting nozzle holder 51. The cutting nozzle 31 has, in lower conical sections, outer longitudinal slots 52, which form fuel gas passages, which communicate with a nozzle chamber 53, the fuel gas or a fuel gas component through a line 54 is supplied. The cutting oxygen supply to a cutting zone is through the cutting oxygen line 55 and a central cutting oxygen channel 56 around the vertical center line 55.

In FIG. 7 61 denotes the cutting nozzle and 62 denotes the heating nozzle of a cutting torch in an outer cap 74 adapted to the outer shape of the heating nozzle 62.

The formation of the cap-like Heizdüsenanordnung in FIG. 7 is from the almost identical heating nozzle arrangement in FIG. 8 more clearly seen, in which the interchangeable used in an outer cap 104 Heizdüse is designated 92. In an upper portion 94, a fixing body 95 is fixed inside, from which two bayonet grooves 96, 97 are formed. Inside the outer cap, an annular bearing surface 103 is formed, which is also referred to as a second bearing surface, because it with a first annular bearing surface, for example 72 in Fig. 7 , indirectly cooperating, which is arranged on a lower Außenmatelabschnitt 70 of the burner head 63. The second annular bearing surface 103 supports a circumferential collar 106, which is formed in the heating nozzle projecting upwardly outward. On the upper side of the collar 106, an annular sealing bearing surface 107 is formed, which receives an O-ring 101, in a circumferential groove 102. The cap-like nozzle arrangement, with the exception of the bayonet grooves 96, 97 rotationally symmetrical about the center axis 108 vertical in the position of use.

Like back out FIG. 7 can be seen, in a top portion 64 of the outer cap 74, a fixing body 65 fixedly inserted from the diametrically opposite two bayonet grooves 66, 67 are formed, which the bayonet grooves 96, 97 in Fig. 8 correspond. In each of the two bayonet grooves 66, 67 each engage a dowel pin 68, 69, which protrudes from a lower outer shell portion 70 of the burner head 63.

The bayonet connection in FIG. 7 is reliably held firmly by the O-ring 71, which between a first annular bearing surface 72 on the lower outer shell portion 70 of the burner head 63 and a in FIG. 7 unspecified sealing surface, corresponding to 107 in Fig. 8 , is arranged on top of the heating nozzle 62. The pressure force acting on the O-ring 71 is conducted from the second bearing surface 73 of the outer cap 74 via the collar 76 of the heating nozzle 62 in the O-ring 71. Thus, the inner space of the outer cap 74 enclosing the heating nozzle 62 is well sealed to the outside.

The cutting nozzle 61 also points in FIG. 7 two axially spaced O-rings 78, 79 on a cylindrical upper portion 80 which is inserted in the assembled state of the cutting torch in a cutting nozzle receptacle 81. The cutting nozzle 61 has, in lower conical sections, outer longitudinal slots 82 which form fuel gas passages communicating with the nozzle space 83 to which fuel gas and fuel gas component, respectively, are supplied. The cutting oxygen supply to a cutting zone occurs through the cutting oxygen conduit 85 and a central cutting oxygen passage 86 about the vertical center axis 87.

LIST OF REFERENCE NUMBERS

1

cutting nozzle

2

cap-shaped heating nozzle

3

burner head

4

upper section

5

fixing body

6

bayonet groove

7

bayonet groove

8th

dowel

9

dowel

10

Outer shell section

11

O-ring

12

1. annular bearing surface

13

2nd annular bearing surface

14

15

O-ring

16

cylindrical surface

17

cylindrical surface

18

O-ring

19

O-ring

20

upper cylindrical section

21

Cutting nozzle receiving

22

slot

23

nozzle chamber

24

management

25

Cutting oxygen line

26

Cutting oxygen channel

27

central axis

28

29

30

31

cutting nozzle

32

cap-shaped heating nozzle

33

burner head

34

upper section

35

fixing body

36

bayonet groove

37

bayonet groove

38

dowel

39

dowel

40

Outer shell section

41

O-ring

42

1. annular bearing surface

43

2nd annular bearing surface

44

45

46

47

48

O-ring

49

O-ring

50

upper cylindrical section

51

Cutting nozzle receiving

52

longitudinal slot

53

nozzle chamber

54

management

55

Cutting oxygen line

56

Cutting oxygen channel

57

central axis

58

59

60

61

cutting nozzle

62

heating nozzle

63

burner head

64

upper section (the outer cap)

65

fixing body

66

bayonet groove

67

bayonet groove

68

dowel

69

dowel

70

Outer shell section

71

O-ring

72

1. annular bearing surface

73

2nd annular bearing surface

74

outer cap

75

76

Federation

77

78

O-ring

79

O-ring

80

upper cylindrical section

81

Cutting nozzle receiving

82

longitudinal slot

83

nozzle chamber

84

85

Cutting oxygen line

86

Cutting oxygen channel

87

central axis

88

89

90

91

92

heating nozzle

93

94

upper section (the outer cap)

95

fixing body

96

bayonet groove

97

bayonet groove

98

99

100

101

O-ring

102

groove

103

2nd annular bearing surface

104

outer cap

105

106

Federation

107

Sealing surface

108

central axis

Claims (12)

1. Cutting torch comprising a torch head (3, 33, 64) which receives a replaceable cutting nozzle (1, 31, 61) which is surrounded by a cap-like heating-nozzle assembly (2; 32; 62, 74; 104) comprising an axial through-hole, an outer casing of the cutting nozzle (1, 31, 61) being provided with longitudinal slots (22, 52, 82) which extend upstream from a lower end of the cutting nozzle (1, 31, 61), and cross sections of the axial through-hole in the cap-like heating-nozzle assembly (2; 32; 62, 74; 104) being conically narrowed in at least one region between the upper upstream-side end thereof and the nozzle outlet thereof, whereby at least one conical portion of the cutting nozzle (1, 31, 61) can be positioned in the cap-like heating-nozzle assembly (2; 32; 62, 74; 104), a cutting nozzle receiving portion (21, 51, 81) being shaped in the torch head (3, 33, 63) which receives an upper cylindrical portion (20, 50, 80) of the cutting nozzle (1, 31, 61), the cylindrical upper portion (20, 50, 80) of the cutting nozzle (1, 31, 61) bearing at least one O-ring (18 and 19; 48 and 49; 78 and 79) which fits tightly on the cutting nozzle receiving portion (21, 51, 81) of the torch head (3, 33, 63) and at least one first connecting element of a quick-acting closure (6, 7; 36, 37; 66, 67; 96, 97) being fixed on the inside to an upper portion (4, 34, 64, 94) of the cap-like heating-nozzle assembly (2; 32; 62, 74; 104), which first connecting element is releasably connected to at least one second connecting element of the quick-acting closure (8, 9; 38, 39; 68, 69), which is fixed to a lower outer-casing portion (10, 40, 70) of the torch head (3, 33, 63), characterised in that an O-ring (11, 41, 71, 101) is arranged between a first annular bearing surface (12, 42, 72) or sealing bearing surface (107) which extends at a right angle to the central axis (27, 57, 87, 108) of the cap-like heating-nozzle assembly (2; 32; 62, 74; 104) on a lower outer-casing portion (10, 40, 70) of the torch head (3, 33, 63) and a second annular bearing surface (13, 43, 73, 103) opposite the first annular bearing surface (12, 42, 72) or sealing bearing surface (107), which projects inwards on the upper portion (4, 34, 64, 94) of the cap-like heating-nozzle assembly (2, 32, 62, 74, 104) and extends at a right angle to the central axis (27, 57, 87, 108) of the cap-like heating-nozzle assembly (2; 32; 62, 74; 104).
2. Cutting torch according to claim 1, characterised in that the cap-like heating-nozzle assembly is a cap-like heating nozzle (2, 32, 62).
3. Cutting torch according to claim 1, characterised in that the cap-like heating-nozzle assembly comprises an outer cap (74, 104) and a heating nozzle (62, 92) which is replaceably inserted into the outer cap (74, 104), in that the at least one first connecting element (66, 67) of the quick-acting closure is fixed on the inside to an upper portion (64, 94) of the outer cap (74, 104), in that the second annular bearing surface (73, 103) is shaped from the outer cap (74, 104) and supports a shoulder (76, 106) on an upper portion of the heating nozzle, and in that a sealing bearing surface (107) is formed on the shoulder (76, 106) and receives the O-ring (71, 101), which is thus arranged indirectly between the first bearing surface (72) and the second bearing surface (73, 103).
4. Cutting torch according to any of claims 1 to 3, characterised in that at least one locating pin (8 and 9; 38 and 39; 68 and 69) projects from a lower outer-casing portion (10, 40, 70) of the torch head (3, 33, 63) and in that at least one bayonet groove (6 and 7; 36 and 37; 66 and 67; 96 and 97) is arranged in the upper portion (4, 34, 64, 94) of the cap-like heating nozzle (2, 32) or of the outer cap (74, 104), in which groove the at least one locating pin (8 and 9) engages.
5. Cutting torch according to claim 4, characterised in that two locating pins (8, 9; 38, 39; 68, 69) project outwards in a diametrically opposing manner from the lower outer-casing portion (10, 40, 70) of the torch head (3, 33, 63) and in that two bayonet grooves (6, 7; 36, 37; 66, 67; 96, 97) are arranged on the inside at diametrically opposing points on the upper portion (4, 34, 64, 94) of the cap-like heating nozzle (2, 32) or of the outer cap (74, 104), in which points the locating pins (8, 9; 38, 39; 68, 69) engage.
6. Cutting torch according to either claim 4 or claim 5, characterised in that the bayonet groove or bayonet grooves (6, 7; 36; 37; 66, 67; 96, 97) are shaped from a fastening body (5, 35, 65, 95) which is fastened in the upper portion (4, 34, 64, 94) of the cap-like heating nozzle (3, 32) or of the outer cap (74, 104).
7. Cutting torch according to any of claims 4 to 6, characterised in that the bayonet groove(s) (6, 7; 36; 37; 66, 67; 96, 97) extend(s) over up to a quarter of the inner circumference of the upper portion (4, 34, 64, 94) of the cap-like heating nozzle (2, 32) or of the outer cap (74, 104).
8. Cutting torch according to either claim 1 or claim 2, characterised in that a lower outer-casing portion of the torch head is provided with an external thread and in that an upper portion of the cap-like heating nozzle comprises an internal thread which fits into the external thread of the torch head.
9. Cutting torch according to claim 3, characterised in that a lower outer-casing portion of the torch head is provided with an external thread and in that an upper portion of the outer cap comprises an internal thread which fits into the external thread of the torch head.
10. Cutting torch according to any of the preceding claims, characterised in that a cylindrical sealing face is respectively shaped on the outside on the lower portion of the torch head and on the inside on the upper portion of the cap-like heating nozzle.
11. Cutting torch according to claim 10, characterised by an O-ring between the two cylindrical sealing faces, which together seal the space formed between the cap-like heating nozzle and the cutting nozzle against the outside.
12. Cutting torch according to any of the preceding claims, characterised in that the cylindrical upper portion of the cutting nozzle bears two O-rings with axial spacing, which rings fit tightly on the cutting nozzle receiving portion of the torch head.

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