US3817681A

US3817681A - Oscillating burner device

Info

Publication number: US3817681A
Application number: US00296550A
Authority: US
Inventors: F Haag; O Locher
Original assignee: Motan GmbH
Current assignee: Motan GmbH
Priority date: 1971-10-13
Filing date: 1972-10-11
Publication date: 1974-06-18
Anticipated expiration: 1991-06-18
Also published as: DE2150893C2; DE2150893A1; GB1390533A; JPS4846929A; CA971098A; JPS5644324B2

Abstract

A burner device having an oscillatable resonator tube with a discharge at one end and having a carburetor connected to the other end via a burner pipe. A tank is provided containing liquid to be injected into the resonator tube to create smoke. A pressure supply passage leads into the tank and a conduit leads out of the tank to the resonator tube and a control valve controls the passage and the conduit.

Description

United States Patent 1191 Haag et al. June 18, 1974 [5 OSCILLATING BURNER DEVICE 2,898,978 8/1959 Kitchen et a1. 431/1 2,926,855 3/1960 D t l. 60/39.77 X [75] Inventors: Franz Haag; when both 0f 3,005,485 10/1961 85252121.... 431/1 lsny/Allgau, Germany 3,252,496 5/1966 Haag 431/1 73 Assignee: gnaw 011 81111 11 mitGbeschrmlkter FOREIGN PATENTS OR APPLICATIONS a Sny emany 1,053,662 9/1953 France 431/1 [22] Filed: Oct. 11, 1972 [2]] Appl 296550 Primary ExaminerWilliam F. ODea Assistant ExaminerWilliam C. Anderson Attorney, Agent, or FirmWalter Becker [30] Forelgn Application Priority Data Oct. 13, 197] Germany 2150893 52 US. Cl 431/1, 60/247, 60/39.8, A burner device having an Oscillatable resonator tube 0/39 77 with a discharge at one end and having a carburetor [51] Int. Cl. F23c 3/02 connected to the other end Via a burner P P A tank [58] Field 61 Search 431/1; 60/247, 249, 39.8, is Provided containing liquid to be injected into the 0/39 77; 137/525 51 5 resonator tube to create smoke. A pressure supply passage leads into the tank and a conduit leads out of 5 References Cited the tank to the resonator tube and a control valve con- P tI'OlS the passage and the Conduit.

2,644,512 7/1953 Durr et al. 431/1 32 Claims, 11 Drawing Figures minimum I 3.617.681

SHEET 3!]? 7 PATENTEDMIBW 1 38171681 SHEET NF 7 1 OSCILLATING BURNER DEVICE The present invention relates to an oscillating burner device with an oscillating burner resonator, the combustion chamber of which is connected to the fuel mixture outlet of a carburetor, while the carburetor in a carburetor housing has an air passage provided with at least one air inlet opening, a fuel feeding line feeding into said air passage.

It is an object of this invention to provide an oscillating burner device of the above mentioned type which, with as low a weight as possible, will have a high output.

This object and other objects and advantages of the invention will appear more clearly from the following specification, in connection with the accompanying drawings, in which:

FIG. 1 is a side view of an oscillating burner device according to the invention.

FIG. 2 illustrates a section taken along the line II-II of FIG. 1, but on a larger scale than in FIG. 1.

FIG. 3 illustrates an axial view of a diaphragm of the carburetor according to FIG. 2.

FIG. 4 shows the atomizer nozzle of the carburetor according to FIG. 2 on an enlarged scale.

FIG. 5 is a partially sectioned side view of the oscillating burner-resonator according to FIG. 1.

FIG. 6 is a top view of the arrangement according to FIG. 5.

FIG. 7 illustrates on an enlarged scale a section along the line VII-VII of FIG. 6.

FIG. 8 diagrammatically illustrates the rotary valve member of the valve according to FIG. 7.

FIGS. 9 and 10 illustrate the valve of FIGS. 7 and 8 in different valve positions.

FIG. 11 illustrates on an enlarged scale, a section along the line XIXI of FIG. 6.

The burner device according to the present invention is characterized primarily in that in the flow path between the air inlet opening and the combustion chamber there is arranged at least one check valve adapted to close under the influence of the overpressure in the combustion chamber, said check valve being provided with a closure member oscillating together with the burner oscillations, and having a valve seat associated therewith.

According to a further feature of the invention, the check valve between the air inlet opening and the fuel feed line is preferably provided at the air inlet opening so that its construction can be very simple.

In order further to decrease the inflow resistance acting upon the combustion air, the valve closure member is equipped with a spring diaphragm and preferably formed by said diaphragm so that a valve will be obtained which has a very low inertia and consequently will assure precise opening and closing times. It is particularly advantageous so to arrange the spring diaphragm that the latter when occupying its rest position is located approximately level opposite the valve seat which extends around a diaphragm axis and is formed in particular by inlet openings uniformly distributed around the diaphragm axis. In this way there will, on one hand be obtained a large inlet cross section, and on the other hand all individual openings will be closed at the same time.

According to a further development of the invention, the diaphragm which is preferably in the shape of an annular disc is clamped in in the carburetor housing at zones which are uniformly distributed around the diaphragm axis and are readily spaced from the valve seat so that the diaphragm is in an almost completely friction-free manner mounted with precisely determinable damping and can freely oscillate. A further improvement in this respect is obtained when the diaphragm, preferably at the inner circumference, has at least three particularly plate-shaped protruding extensions which are clamped into the valve housing.

For further improving the control of the oscillations of the spring diaphragm, the latter is located in a gap, especially an annular gap, which on one hand is confined by the valve seat, and on the other hand is confined preferably by an abutment surface for the diaphragm in rest position. The abutment surface may, in a simple manner, he formed by a clamping element for the diaphragm, preferably by a clamping ring arranged in the carburetor housing in the diaphragm axis.

In order to make sure that the diaphragm will be particularly favorably influenced by the burner oscillations, the abutment surface or the clamping ring is provided with passages extending therethrough which are coaxial to the individual openings of the valve seat.

For purposes of obtaining a favorable mixture of fuel with the combustion air, the valve closure member is arranged around the axis of a section of the flow path of the carburetor housing which leads to the burner. The fuel feed line leads into this section, preferably in the axis of said section. According to a particularly simple embodiment of the invention, the valve closure member is located in a disc-shaped chamber of the carburetor housing, which chamber at the end face of the device merges with the section leading to the burner, and preferably at the oppositely located end face comprises the fuel feed line whereby also a preparation low in losses of the fuel mixture will be obtained.

In order to assure a flow of the air through the check valve in a most unimpeded manner, an air passage preferably formed by an annular gap is provided between the outer circumference of the clamping element and the spring diaphragm and the inner circumference of the disc-shaped chamber of the carburetor housing.

A pan'tcularly advantageous further development of the invention consists in that two preferably coaxially oppositely located closing members for separate valve seats are provided and preferably are arranged in the same carburetor chamber, so that with a compact structure a very large air inlet cross section is obtained. The two valve closing members may together with the pertaining valve seats be of substantially the same design, preferably may form an image to each other and may be symmetrically arranged with regard to the central plane therebetween.

In order to prevent the two air streams which pass through the two check valves into the carburetor housing from afiecting each other, a partition is provided in the carburetor housing which receives the valve closing members. This partition which is arranged between the valve closing members is within the region of the fuel inlet, preferably within the axis of the fuel inlet provided with an opening in order to divide the air flowing into the carburetor housing, into two uniform components so that the inflow resistance is reduced. The annular partition may in a simple manner within the region of its outer circumference be clamped in between two easily detachable housing parts of the carburetor housing whereby the interior of the carburetor with the above mentioned parts will be easily accessible. For purposes of obtaining favorable flow conditions, the opening in the partition has approximately the same width or magnitude as that section of the flow path of the carburetor housing which leads to the burner.

According to the invention, for increasing output, especially with an osciallating burner device of the type described above, it is further suggested that the nozzle which forms the fuel feed passage has both ends provided with an open nozzle passage which, at least over a portion of its length, forms a section decreasing at a flat angle, for instance, of from 12 to 18 and merges with a passage section which widens again toward the nozzle opening. Between the two-passage section within the region of the greatest underpressure there is provided a fuel inlet opening.

Expediently, the fuel inlet opening is arranged around the axis of the nozzle passage and is preferably formed by a disc-shaped chamber which is greater in diameter than the nozzle passage. This last mentioned chamber is formed by a gap between the two-passage sections so that fuel can enter the nozzle passage uniformly over the entire circumference.

It is particularly advantageous if the passage section which widens again with a flow in a direction counter to the widening direction has a greater flow resistance than the narrowing passage section with the flow in its narrowing section. Preferably, the passage section widening again is with approximately the same cone angle as the other passage section, considerably shorter than the latter. During the intake phase, a flow exists in the nozzle passage in the direction toward the fuel nozzle. The above described design of the starting current in this directin is effected nearly without losses in view of the flat angle of the narrowing nozzle section up to the narrowest portion thereof. Due to the opening ratio of the passage which widens again it will be obtained that with the laminary start of the current or flow, during the inlet phase at the exit end of the passage section widening again there will be obtained cavitation or separation as a result of which the larger fuel drops which are located at the rim of this passage section will be discharged and are retained or returned in the separation zone due to the underpressure there prevailing. When the said separation, for instance, in view of an increase in the output turns into a turbulent flow, the said separation and thus the dropping out of the larger fuel drops will be prevented because the turbulent or current which is rich in energy will assure a finer drop preparation of the fuel. Within the region between the two passage sections, the greatest underpressure prevails which is caused by the maximum flow velocity in this region. As a result thereof, the fuel is drawn in. The mixture of air and fuel begins within the region between the two passage sections and then continues in the again widening passage section as well as above the nozzle in the valve housing where the mixture when passing through the opening in the partition of the carburetor is intermixed with the two mentioned intake air flows controlled by the check valves.

During the explosion phase, the current or flow in the nozzle is reversed relative to the intake phase, whereby within the region of the two passage sections there will likewise be created an under-pressure, the absolute magnitude of which, however, is lower than is the case during the intake phase. This is due to the fact that in this instance the flow start, which means the increase in the velocity, has greater losses in view of the smaller opening conditions of the two end cross sections of the passage section which again widens. As a result thereof, during the explosion phase, as little fuel mixture is conveyed into the nozzle passage or therethrough.

For purposes of obtaining a simple fuel feed, there is provided a fuel passage of annular cross section which is connected to the fuel feeding line. This fuel passage merges at one end with the fuel inlet opening or the pertaining disc-shaped chamber. In view of the design of the carburetor according to the invention, an opti mum tuning of the combustion air inlet and a uniform fuel atomization is realized during the entire inflow process so that a waste gas which is practically from Co can be realized. As a result thereof, the oscillating burner device according to the invention is suitable, particularly for disinfecting inner chambers and tents, particularly when either only a Co-free hot waste gas air mixture alone, or a mixture of such waste gas with the respective efiective substance is required. The degree of atomization of the fuel nozzle according to the invention is extremely high.

In order again to refine or prepare the fuel which has been returned during the explosion phase and in order to be able to again convey said returned and refined fuel to the carburetor, that end of the preferably rectilinear nozzle passage which faces away from the nozzle opening is connected to a turbulent chamber. Expediently, the turbulence chamber for obtaining a compact flow favoring construction is arranged on that side of the carburetor, preferably in the axis thereof which faces away from the outlet side.

For purposes of further improving the refining of the fuel air mixture, the outlet opening of the carburetor is connected to a mixing pipe which is equipped with swirl vanes or bafiles and which preferably leads approximately tangentially into the combustion chamber.

It is particularly expedient to locate the turbulence chamber, the fuel nozzle, and the check valve, as well as the mixing pipe so that their axes are aligned with each other while, as mentioned above, one or two check valves may be provided.

In order to be able for purposes of starting the oscillating burner-resonator, to introduce air into the carburetor, there is provided within the region of the fuel supply in the carburetor, preferably in the plane of the nozzle opening and adjacent thereto a starting air opening which is connected to a starting air conduit.

If, by means of the oscillating burner device, the respective effective substance is to be converted into a smoke screen, it is expedient to provide in the carburetor housing, preferably in the plane of the nozzle opening and adjacent thereto, a pressure withdrawal opening for at least one storage container for the effective substance and/or at least a conduit for the effective substance so that the effective substance can be conveyed under pressure and that it will be possible to wash the conduit for the effective substance by gas under pressure. According to a simple embodiment of the invention, the pressure withdrawal opening may be formed by the starting air opening.

A particularly advantageous further development of the invention is obtained when a muIti-way valve with special air and effective substance valve chambers is provided. This multi-way valve has a pressure inlet connected to the pressure withdrawal opening and also has outlets associated with said pressure withdrawal opening, for the conduit conveying the effective substance and for the storage tank for said effective substance.

Moreover, said multi-way valve is provided with the inlet for the effective substance which communicates with the storage tank for the effective substance. The said inlet for the effective substance has associated therewith an outlet communicating with the conduit for the effective substance. When the valve occupies a first position, the pressure inlet communicates with the storage tank for the effective substance, and the outlet for the effective substance is closed relative to the inlet for the effective substance. When said multi-way valve occupies a second position, the pressure inlet communicates with the storage tank for the effective substance, and the inlet for the effective substance is connected to the outlet of the effective substance. Thus, with the first mentioned valve position it will be realized that in spite of the fact that the supply of effective substance is cut off, the storage tank for the effective substance is still under pressure so that when the valve is set for its second position, effective substance will immediately be conveyed. In order to make sure that when the outlet of the effective substance is closed relative to the inlet for the effective substance, the conduit conveying the effective substance is immediately washed through, it is provided that with this valve position, the outlet for the effective substance is connected to a pressure inlet. Preferably two separate pressure inlets are provided for the storage tank for the effective substance and the outlet for the effective substance, and both pressure inlets are in communication with the pressure outlet for the above mentioned storage tank while the outlet for the effective substance which is in communication with the inlet for the effective substance communicates with the pressure outlet for the above mentioned storage tank. Consequently, the entire pressure from both pressure inlets acts upon the storage tank for the effective sub stance and thus aids the supply or feeding of effective substance to the effective substance conveying conduit.

There are effective substances, especially smoke producing agents which mix only poorly in liquid condition or are not compatible in this condition as is the case, for instance, with substances of different specific weights. Therefore, according to the present invention it is suggested that at least two separate storage tanks for the effective substances are provided which are preferably connected to a separate multi-way valve. It is also possible to employ separate containers. However, it has proved particularly advantageous to form the tanks for the effective substances by a common tank and to divide such tank by a partition adapted to be opened so that selectively a single, or at least two separate tanks for the effective substances are available.

According to a further development of the invention, the separate tanks are through separate conduits for the effective substances connected to at least one nozzle leading into the oscillating pipe of the oscillating burner resonator. The effective substances will then, directly prior to their discharge, be intermixed in said nozzle. It is furthermore possible to provide a plurality of smoke nozzles and to connect the same to the respective tanks which contain the effective substances so that the intermixture of the effective substances occurs only after these substances have left the nozzles,

in other words, occurs only in the oscillating pipe in an aerosol-like condition. In the first mentioned instance, the nozzle is expediently designed as mixing nozzle.

When relatively large quantities of smoke producing agents are involved, as may be the case with high output devices, it should be assured that the smoke will have a homogeneous distribution of the droplets with as uniform and fine smoke droplets of from approximately 10 to 50p, because large drops over p have, in view of their high weight too low a floating ability and therefore quickly drop out and consequently do not permit an economic exploitation of the effective substance. According to the invention, for purposes of avoiding these drawbacks, it is suggested that at the end of the oscillating pipe of the oscillating burnerresonator there is provided a smoke nozzle, the inner width of which, in the flow direction is at least once widened in a steplike manner in order to form a back circulation flow for the effective substance.

When the burner and the oscillating tube are surrounded by a protective and cooling mantle, it is expedient to have this mantle protrude beyond the front end of the oscillating tube and to surround the smoke nozzle at such a great distance that the latter will still generate a sufiicient injector effect in the cooling air mantle.

According to a further feature of the invention, the oscillating bumer-resonator is preferably within the region of its rear end pivotable about a substantially horizontal transverse axis and is arrestably mounted on a supporting frame so that it can be pivoted upwardly and can be adjusted at will. For purposes of obtaining a favorable center of gravity position, the fuel container is arranged along the pivot axis. Furthermore, for simplifying the operation, it is advantageous when a battery and ignition box, or the like, and/or a starting pump are stationary with regard to the oscillating burner-resonator and together therewith are pivotally mounted on the supporting frame. The oscillating burner device according to the invention may be employed as hot gas generator, one component smoke laying device, and also as more component smoke laying device.

Referring now to the drawings in detail, FIG. 1 shows an oscillating burner device according to the invention which comprises an oscillating burner-resonator l which, within the region of its rear end is pivotable about a horizontal shaft 3 located below said burnerresonator I mounted on a supporting frame 2 formed by a tubular frame. Fixedly connected to the bumerresonator 1 is a manually operable starting air pump 4 and an ignition as well as battery box 5. This connection is such that the parts 4, 5 with the oscillating burner-resonator 1 are pivotable about the shaft 3. A fuel tank 6 is located inside the supporting frame 2 and has its axis located within the pivot shaft 3. Connected to the supporting frame 2 is a tank 7 for the effective substance, which tank has its top side equipped with a multi-way valve 8 and with a filling opening 9. In view of the pivotable mounting, the oscillating burnerresonator can in steps be adjusted and moved into the positions indicated by dash lines in FIG. 1 at an incline upwardly, or at an incline downwardly. Within the region of the rear end of the oscillating burner-resonator, a carburetor 10 according to FIG. 2 is connected to a cooling and protective mantle 1 l which forms the outer mantle of said burner-resonator. More specifically, said carburetor 10 is connected laterally of that side of said mantle 11 on which the tank 7 is provided.

The carburetor 10 has a housing 12 which is composed substantially of two housing sections 13, 14 which are axially aligned and have a dividing plane which extends at a right angle with regard to the carburetor axis. At the dividing area, the two housing sections 13, 14 respectively have a protruding annular collar. The annular collars are engaged by an easily disengageable clamping element 15.-Thus, the housing sections 13 and 14 can easily be held or clamped together.

The carburetor housing chamber substantially comprises two axially aligned sections 16, 17 of which one section is approximately circulardisc-shaped and is located within the region of the dividing plane of two housing sections 13, 14. The section 17 is substantially cylindrical and has a diameter which is considerably shorter than that of the section 17. In the vicinity of the inner circumference 18 of the disc-shaped housing chamber 16, the two annular end faces 19, 20 which are located opposite to each other are provided with a plurality of air inlet openings 21 which are located along a circle around the carburetor axis. Atmospheric air can be drawn into the valve housing through said openings 21. Opposite the inner surfaces 22 of the annular disc-shaped end faces 19, 20 there is respectively located an annular spring diaphragm 18 in spaced relationship to said inner surfaces. Each diaphragm 23 has a valve closing member which is adapted to rest against a pertaining inner surface 22, hich forms a valve seat, in such a way that all pertaining air inlet openings 21 will be closed simultaneously. Each diaphragm 23 has, in conformity with FIG. 3, its inner circumference provided with three plate-shaped extensions 24 which are uniformly distributed around the diaphragm axis and form one piece with the diaphragm. By means of said extensions 24, the diaphragm 23 is clamped in between the corresponding inner surface of the pertaining housing section 13,14 and a clamping ring 25 which is detachably connected by screws 26 to the pertaining housing sections 13, 14. The two clamping rings 25 may be of identical design. That end face 27 of the respective clamping ring 25 which faces the pertaining diaphragm 23 forms an abutment surface for the pertaining diaphragm 23 in such a way that this diaphragm when in rest position abuts said abutment surface 27 in a plane which is perpendicular to the carburetor axis. In view of the above outlined design, each diaphragm 23 is located in an annular disc-shaped gap 28, the thickness of which is approximately twice the diaphragm thickness and determines the freedom of movement of the diaphragm 23. Between the outer circumferential surface of each clamping ring 23 and the circumferential surface 18 of the disc-shaped housing chamber 16, there is provided an annular gap 29 for the passage of air from the respective gap 28 into the chamber between the clamping rings 25. In both clamping rings 25 there are provided passages or bores 30 which are coaxial with the inlet openings 21 and which may be greater than the inlet openings 21 or may have a greater overall cross section than the cross section of the respective pertaining annular gap 29 and in rest position of the respective pertaining diaphragm 23 are closed'by the latter.

The inner diameter of the clamping rings 25 equals the inner diameter of the cylindrical housing section 17. The inner edges of the clamping rings 25 are at the end faces which face each other rounded over a quarter of a circle in a funnel-shaped manner. Between the two clamping rings 25, in the dividing plane of the carburetor housing 12, there is provided an annular discshaped partition 31. This partition is within the region of its outer rim clamped between the two housing sections 13, 14. Moreover, partition 31 has a central opening 32, the diameter of which equals the diameter of the housing chamber 17. At one end face of the discshaped housing chamber 16 there is provided the cylindrical housing chamber 17 adjacent to the funnel opening of the pertaining clamping ring 25. At the oppositely located end face of the housing chamber 16 there is located a fuel nozzle opening 33 along the axis of the carburetor. The nozzle opening 33 is provided in a bottom wall 34 of the inner funnel of the pertaining clamping ring 25 which is located in a plane perpendicular to the axis of the carburetor. Adjacent to the nozzle opening 33 and in the same plane as the latter there is provided a starting air opening 36 located within the per taining funnel, the said nozzle opening 33 is arranged in a fuel nozzle 35 located in the pertaining housing section 14 of the carburetor. The said starting air opening 36 is through a passage 37 in the pertaining housing section 14 in communication with the air pump 4 so that it is possible manually to pump compressed air into the carburetor. The fuel nozzle 35 communicates through a bore 38 in the carburetor section 14 with the fuel tank 6.

The fuel nozzle 35 has a nozzle passage 39 which is located along the carburetor axis. That end of the nozzle passage 39 which faces away from the nozzle opening 33 is in communication with the cylindrical turbulence chamber 40. The diameter of said chamber 40 is greater than that of the housing chamber 16. The turbulence chamber 40 may be connected to a compressed air conduit and/or to a return conduit for returning fuel to the fuel tank 6.

The end of the cylindrical housing chamber 17 is connected to a mixing pipe 41 which is located along the axis of the carburetor and in which in the mixing pipe axis there is provided a swirl body 42. In the direction toward the fuel chamber 43 directly following the body 42 there is in the mantle of the mixing pipe 41 arranged an ignition plug 44. This ignition plug 44 extends into said mixing pipe 41 and is adapted to ignite the fuel air mixture directly prior to its entrance into the cylindrical combustion chamber 43. The mixing pipe 41, the inner diameter of which substantially equals the diameter of the carburetor chamber 17 approximately tangentially merges with the combustion chamber 43 and has a diameter which is only onefourth shorter than the radius of the combustion chamber 43. In view of this design, all parts which serve the preparation and feeding of the fuel are located along a single axis.

As shown in FIG. 4, the fuel nozzle 35 forms an atomizer nozzle which comprises a nozzle body core 45. This core 45 is pressed into a substantially cylindrical nozzle housing 46 provided at its front end with an end face wall 47. Arranged in the nozzle core body is the essential section of the nozzle passage 39 which comprises a cylindrical section 48 extending approximately over half its length. The nozzle passage 39 furthermore comprises a comically decreasing section 49 which in the direction toward the nozzle opening 33 follows the cylindrical section 48. The said section 49 has a conical angle of from approximately 12 to 18. The narrowest portion of the conical section 49 merges with a very short cylindrical section which extends to the pertaining end face 50 of the core body 45.

This end face 50 is spaced from the oppositely located inner end face 51 of the end face wall 47 of the nozzle housing 46 whereby a circular disc-shaped intermediate chamber 52 is formed. Provided in the wall 47 of the nozzle housing 46, in axial alignment with the nozzle passage 39 is a bore 53 which widens toward the nozzle opening 33 at an angle of from 12 to 18. The

smallest diameter of bore 53 equals approximately the diameter of the oppositely located short cylindrical section. The end of bore 53 which is located in the outermost end face of the wall 47 forms the nozzle opening 33. Above a front portion of the length of the core body 45 and extending therearound is a cylindrical mantleshaped annular passage 54 which through a radial bore 55 in the nozzle housing 46 is connected to the fuel passage 38, said bore 55 being located at therear end of said passage 54. During a flow within the nozzle 35 in the direction of the arrow 56 toward the nozzle opening 33, in view of the described design, a smaller flow resistance is encountered than is the case in the oppositely located flow direction indicated by the arrow 57. Moreover, with a laminary start of the flow in the direction of the arrow 56, a separation at the confining edge of the nozzle opening 33 occurs, whereby fuel particles are retained or returned and are again intermixed. At the conversion to a turbulent flow, this separation is, however, prevented while eventually obtained larger fuel drops are, nevertheless, finely prepared in the energy-rich turbulent flow.

For purposes of operating the oscillating humerresonator 1, first air is pumped by the manually operable pump 4 into the carburetor. The air mixes at the nozzle opening 33 with fuel and the thus formed mixture passes by the spark plug 44 where the mixture is ignited by spark plug 44. As soon as the pulsating combustion process is thus initiated, air and fuel are automatically drawn into and conveyed to the combustion chamber 43. During the intake phase, the check valves formed by the diaphragms 23 are open so that on both sides of the partition 31 two air currents extending over 360 about the carburetor axis will flow radially inwardly to the carburetor axis where they will unite within the region of the opening 32 in the partition wall and will mix with the fuel-air mixture coming from the nozzle opening 33. This mixture is deviated and conveyed to the mixing pipe 41 in which a still finer intermixture occurs until the mixture is ignited. During the thus obtained explosion, the overpressure developing in the carburetor presses the diaphragms 23 against the valve seats 22 whereby all inlet openings 21 are simultaneously closed. At the same time, due to this pressure, in view of the relatively high flow resistance offered by the nozzle passage section 53, only a slight return flow of the fuel air mixture to the turbulent chamber 40 is possible. The repeated opening and closing of the diaphragms 43 brings about a co-oscillation of the diaphragms 23 with the oscillations of the gas column in the oscillating burner 1.

The device illustrated in FIGS. lll may, in addition to the generating of hot waste gases also be employed for the laying of smoke of effective substances which are stored in the tank 7. With the embodiment illustrated in FIGS. 5 and 6, the tank 7 equipped with a re movable partition 59 forms two separate tanks 58 for receiving effective substances, in which tanks different effective substances may be stored. The top side of each tank 58 has mounted thereon a multi-way valve 8. The corresponding outlets of the two valves 8 are respectively through a conduit 60 connected to a nozzle 61 which, within the region of the front end of the pipe 62, adjacent the combustion chamber 43, extends into said chamber 43 in such a way that the nozzle opening 63 of the nozzle 61 are located along the axis of the oscillating tube 62. The nozzle 61 forms a mixing nozzle in which the two different effective substance components passing through the conduit 60 are intermixed and are then conveyed to the pipe or tube 62 where they are converted into a smoke in the pulsating hot waste gas flow of the oscillating burner and are then expelled through the front end of pipe 62 and that end of the protective and cooling mantle 11 which is located in front thereof.

Each valve 8 is provided with two pressure inlet connections 64, 65 with compressed gas and is furthermore provided with pressure outlet connections 66, 67. Furthermore, each multi-way valve 8 has an inlet connection 68 for the effective substance and furthermore has a pressure outlet connection 67 for discharging the effective substance. The manually operable rotatable valve member journalled in the valve housing 69 is so designed that in one valve position, namely, the valve position shown in FIGS. 7 and 8, the two pressure inlet connections 64, 65 communicate through separate passages respectively with one of the two pressure outlet connections 66, 67, whereas the inlet connection 68 for the effective substance is shut off with regard to the pertaining pressure outlet 67. The pertaining conduit 60 for the effective substance is connected to the pressure outlet connection 67. The pertaining tank steering the effective substance is connected to the other pressure outlet connection 66, whereas the two pressure inlet connections 64, 65 are connected to the passage 67 of the carburetor l0 and thus are supplied with compressed gas during the operation of the oscillating burner-resonator. In this way, at the valve position according to FIGS. 7 and 8 it will be assured that an overpressure will build up in the respective container 58 whereas simultaneously the respective conduit 60 is washed out by compressed gas. When the valve occupies the position according to FIGS. 9 and 10, the pressure outlet connection 67 pertaining to the conduit 60 for the effective substance is closed with regard to the pertaining pressure inlet connection 65 but is in communication with the inlet connection 68 for the effective substance so that the effective substance medium which through the pressure outlet connection 66 in the tank 58 is under pressure is, through a stand pipe 71 which extends into the tank 58 for the effective substance, pressed through conduit 60 into the nozzle 61. With this valve position, furthermore two pressure inlet connections 64, 65 are in communication with the pressure outlet connection 66 so that the entire pressure acts upon the pertaining tank 58 for the effective substance.

To the end of the oscillating tube 62 there is connected a smoke noule 72 which starting from the inner diameter of tube 62 increases in two steps as to its inner diameter while the axial extension of the two steps 74 and 75 corresponds to approximately one-third of their inner diameter. The rectangular steps 74, 75 are formed by annular disc-shaped plane shoulders 76. Circulatory currents formed in the annular zones formed by said shoulders 76 which circulatory currents bring about a return of greater particles of the effective substance which might have gotten stuck in the direction toward the oscillating two axes. As a result thereof, these particles are prepared and are likewise expelled. The outer diameter of the smoke nozzle 72 is smaller than the inner diameter of the outer mantle 8 to such an extent that in view of the injector effect, a sufficiently strong flow will occur in the outer mantle 11. Expediently, the outer circumference of the smoke nozzle 72 is in the expelling direction indicated by the arrow 73 starting from the outer diameter of the pipe 62 conically increased up to the largest diameter and in the region of the last step 75 is followed by a cylindrical outer circumferential section.

It is, of course, to be understood that the present invention is, by no means, limited to the particular showing in the drawings, but also comprises any modifications within the scope of the appended claims.

What is claimed is:

1. In a burner device; a frame, a resonator tube pivoted near one end to said frame for swinging movement thereon, a carburetor near said one end of said tube having a housing with an outlet connected to said tube, said housing also having air inlet means and fuel inlet means, first passage means in said housing leading from said air inlet means to said outlet and second passage in said housing means connecting said fuel inlet means with said first passage means, and check valve means in said carburetor housing upstream from the said outlet and suspended frictionless normally open toward said outlet and adapted to close with minimum inertia in response to a predetermined overpressure on the downstream side thereof.

2. In a burner device: a frame, a resonator tube pivoted near one end to said frame for swinging movement thereon, a carburetor near said one end of said tube having a housing with an outlet connected to said tube, said housing also having air inlet means and fuel inlet means, first passage means in said housing leading from said air inlet means to said outlet and second passage in said housing means connecting said fuel inlet means with said first passage means, check valve means in said carburetor housing upstream from the said outlet and normally open toward said outlet and adapted to close in response to a predetermined overpressure on the downstream side thereof, said housing being disc shaped and being formed of two parts clamped together, and a partition member clamped between said parts and having a central opening coaxial as said fuel inlet means and said first passage means, said air inlet means and said check valve means being disposed near the periphery of said housing on opposite sides of said partition member.

3. A device according to claim 2 in which said check valve means is in said second passage means.

4. A device according to claim 3 in which said check valve means comprises valve member means in the form of spring diaphragm means.

5. A device according to claim 3 in which said check valve means comprises a plurality of individual openings in said housing along a path coaxial with said first passage means and said check valve means comprises valve member means in the form of annular spring diaphragrns adjacent said openings.

6. A device according to claim 5 in which each said diaphragm has radially inwardly extending protrusions thereon fixed to said housing.

7. A device according to claim 2 in which said check valve means comprises a plurality of circumferential openings extending into said housing from opposite sides, a spring diaphragm in the housing adjacent the openings on each side of the housing, an annular gap in the housing about the periphery of each diaphragm, and a central gap in the housing leading from said annular gaps to said first passage means and forming a part of said second passage means.

8. A device according to claim 2 in which said housing is disc-like, a plurality of axial openings in each side of the housing near the periphery thereof forming said air inlet means, a ring-like diaphragm in the housing spaced from said openings and forming the moveable means of said check valve means, clamping means on the sides of said diaphragm opposite said openings clamping the diaphragm in the housing and axially spaced to define a passage therebetween leading to said first passage means and forming a part of said second passage means, and holes in said clamping rings opening toward the diaphragm.

9. A device according to claim 2 in which said fuel inlet means is coaxial with said second passage means and said resonator tube.

10. A device according to claim 9 in which said second passage means is a disc shaped chamber, said air inlet means and said check valve means being located near the periphery of said disc shaped chamber. 11. A device according to claim 10 in which said check valve means comprises annular diaphragms and an annular gap between the outer periphery of said diaphragms and said disc shaped chamber.

12. A device according to claim 2 which includes a mixing pipe connected between the outlet of said housing and said resonator tube, and a turbulence creating element in said pipe.

13. A device according to claim 12 which includes an ignition element in said pipe.

14. A device according to claim 2 in which said fuel inlet means comprises a nozzle having a nozzle passage therethrough with the downstream end facing said out let, said nozzle passage and said first passage means and said outlet being coaxial, and a turbulence chamber at the upstream end of said nozzle passage.

15. A device according to claim 2 which includes means for supplying starting air to said first passage means.

16. A device according to claim 2 which includes supply tank means for liquid to be injected into said tube, and means for conveying pressure from said first passage means into said tank means.

17. A device according to claim 16 which includes discharge conduit means leading from said tank means, and control valve means controlling said conduit.

18. A device according to claim 17 in which said tank means comprises two compartments, a discharge conduit leading from each compartment and a respective control valve controlling each conduit.

19. A device according to claim 2 in which said tube comprises a stepped nozzle at the discharge end.

20. A device according to claim 19 which includes a protective shield surrounding said tube in spaced relation thereto.

21. A device according to claim 2 which includes a fuel tank in said frame.

22. A device according to claim 21 which includes ignition means downstream from said outlet, and a starting air pump and components of an ignition system mounted for movement in said frame with said tube.

23. In a burner device: a frame, a resonator tube pivoted near one end to said frame for swinging movement thereon, a carburetor near said one end of said tube having a housing with an outlet connected to said tube, said housing also having air inlet means and fuel inlet means, first passage means in said housing leading from said air inlet means to said outlet and second passage in said housing means connecting said fuel inlet means with said first passage means, check valve means in said carburetor housing upstream from the said outlet and normally open toward said outlet and adapted to close in response to a predetermined overpressure on the downstream side thereof, said fuel inlet means comprising a nozzle member having a passage therethrough open at both ends and having a first region therein which tapers inwardly at an angle from about 12 degrees to about 18 degrees in the downstream direction, a further region which tapers outwardly from the downstream end of said first region toward the exit end of said passage, and a fuel inlet passage connected to the juncture of said regions.

24. A device according to claim 23 in which said fuel inlet passage is in the form of an annular chamber surrounding said nozzle passage.

25. A device according to claim 24 in which said further region offers greater resistance to counter flow therethrough than said first region offers to flow therethrough in the downstream direction, said further region being shorter than the first mentioned region.

26. A device according to claim 23 in which said nozzle member comprises a body with a bore therein, and a core member mounted in said bore, said passage extending axially through said core member and having said first region therein toward the downstream end, said body having said second region therein coaxial with said first region and forming the discharge end of the nozzle passage, an annular passage between the core member and body member and communicating with the juncture of said regions, and a fuel supply passage leading into said annular chamber.

27. A device according to claim 26 which includes a turbulence chamber communicating with the upstream end of the nozzle passage.

28. A device according to claim 26 which includes a turbulence chamber communicating with the upstream end of said nozzle passage, said turbulence chamber being formed in said housing.

29. A device according to claim 12 in which said turbulence chamber is on the side of said housing opposite the said outlet.

30. In a burner device: a frame, a resonator tube pivoted near one end to said frame for swinging movement thereon, a carburetor near said one end of said tube having housing with an outlet connected to said tube, said housing also having air inlet means and fuel inlet means, first passage means in said housing leading from said air inlet means to said outlet and second passage in said housing means connecting said fuel inlet means with said first passage means, check valve means in said carburetor housing upstream from the said outlet and normally open toward said outlet and adapted to close in response to a predetermined overpressure on the downstream side thereof, supply tank means for liquid to be injected into said tube, means for conveying pressure from said first passage means into said tank means, discharge conduit means leading from said tank means, and control valve means controlling said conduit, said control valve means being also interposed between said first passage means and said tank means and between said conduit means and said first passage means.

31. A device according to claim 30 in which said control valve means in one position connects said first passage means to said conduit means to blow out the conduit means by fluid pressure and in another position connects said conduit means to said tank means while also connecting said first passage means to the tank means.

32. A device according to claim 30 which includes nozzle means at the end of said discharge conduit means and disposed in said tube.

Claims

5. A device according to claim 3 in which said check valve means comprises a plurality of individual openings in said housing along a path coaxial with said first passage means and said check valve means comprises valve member means in the form of annular spring diaphragms adjacent said openings.

10. A device according to claim 9 in which said second passage means is a disc shaped chamber, said air inlet means and said check valve means being located near the periphery of said disc shaped chamber.

11. A device according to claim 10 in which said check valve means comprises annular diaphragms and an annular gap between the outer periphery of said diaphragms and said disc shaped chamber.

14. A device according to claim 2 in which said fuel inlet means comprises a nozzle having a nozzle passage therethrough with the downstream end facing said outlet, said nozzle passage and said first passage means and said outlet being coaxial, and a turbulence chamber at the upstream end of said nozzle passage.

21. A device according to claim 2 which includes a fuel tank in said frame.