KR20000022461A - Improved concentrated heat agricultural flame cultivator apparatus - Google Patents

Abstract

PURPOSE: An agricultural flame cultivator apparatus is provided to remove weeds and insects by the heat instead of a weedicide and an insecticide. CONSTITUTION: An agricultural flame cultivator comprises a burner construction of bunsen burner type having a gas inlet, a mixing chamber and burner outlet, The burner outlet includes a gauze or mesh member insert bordering the mixing chamber at or near the burner outlet for directing flame into a zone of treatment within the cultivator and an additional burner positioned to direct additional heat into the same zone of treatment to boost heat in the zone of treatment. A vaporiser for LPG gas is also disclosed in which metering means for controlling the flow of liquid fuel into the vaporiser,the metering means being located in the vaporiser chamber or closely adjacent thereto to minimize the volume of fuel between the metering means and the heating means thus ensuring complete vaporisation of the liquid fuel and allowing conventional pressure regulation of the gaseous fuel. An implement for a flame cultivator is disclosed including deflection foils or vanes useful to direct heated air down to ground level in use.

Description

Improved Heat Concentrating Agricultural Flame Cultivator

In agriculture, chemical herbicides and pesticides are commonly used, but there is a growing concern about deterioration of the environment and crops as a result of overuse of these chemicals. So far, alternative methods have been carried out with flame treatment or flame control to control weeds and pests.

The flame method involves applying a strong heat in a short time, but enough to kill pests such as bacteria, weevils, insects or fungal spores that are susceptible to attacking useful crop plants while damaging the leaves and stem cells of the weeds. Flame treatment of plant weeds does not require the actual burning of plant weeds and involves only a rapid temperature increase in the leaf cells of the plant weeds, ie an increase to 50-70 ° C. This causes the leaves and stems of the plant weeds to wither sooner or later, killing sensitive weeds.

Agricultural flame mechanisms (or devices) are known in which a tractor transport (or traction) support frame structure is used to mount a plurality of burners to match the alignment intervals of crop plants in a field of arable land. The instrument moves over the area to be treated at ground speeds of up to 7 km per hour, depending on plant weeds as well as various environmental factors such as ground and air moisture content, ground temperature and burner flame temperature.

Using a combustor of an agricultural implement used to treat a large area of arable land requires a relatively large volume of fuel to be supplied to a relatively large number of burners, assuming that the instrument is processing this area quickly. In the case of a large-capacity burner, problems inevitably arise to maintain an adequate supply of fuel to the burner and achieve optimum combustion efficiency.

As a fuel source for the burner, it is known to use vaporized liquid petroleum gas (LPG), which is preferably propane or a propane / butane mixture. Propane has a boiling point of -42 ° C, so it is stored in fluid state at ambient temperature under pressure in the tank, varying from 40 to 120 psi depending on ambient and storage temperature. Butane has a higher boiling point, so the propane / butane mixture will have a higher boiling temperature than pure propane and will therefore have a lower storage (and fueling) pressure.

Various devices have been proposed in the prior art, including US Pat. No. 3,357,474 (Pivonka), to provide a carburetor for an agricultural flame apparatus for properly supplying gaseous fuel to a burner. Pibonka presents a burner / carburetor structure designed to ensure the vaporization of vaporizable liquid fuels such as butane / propane gas mixtures stored in the liquid state for the purpose of burning gaseous fuel at high speed relative to the size of the burner.

Likewise, US Pat. No. 3,645,664 (Clinton) relates to a carburetor claimed to operate at high efficiency by supplying the burner with vaporized propane fuel in such a way that the fuel is sufficiently combusted with little or no smoke emitted to the atmosphere.

The present LPG combustion apparatus known to the applicant, ie the examples mentioned above, presents a problem of uneven vaporization of liquid fuel in a vaporizer. This problem is probably due to the need to adjust the flow of compressed liquid fuel prior to vaporization and before it is fed to the vaporizer. This regulation inevitably causes the liquid downstream of the regulator to at least partially vaporize, and due to the absorption of heat by vaporizing the liquid, a severe drop in temperature (and often freezing) as well as the regulator valve as well as the regulator valve occurs.

This means that the carburetor accepts fuel which may be partially vaporized or in some cases fully vaporized and in other cases still a complete liquid depending on the temperature of the downstream line between the valve and the carburetor. The temperature of the fuel in the line can vary in ambient temperature, i.e., in the range of 25 ° C and -42 ° C, the boiling point of propane fuel.

It is found that the burner temperature of the flame equipment affects the regular operation of the flame equipment over a long period of time, so that the burner and carburetor need to be kept at a high level at all times because of the minimum speed required for the given speed on the ground by the flame equipment It became. The aforementioned wide temperature range of the fuel feed to the carburetor improperly vaporizes the fuel or causes the fuel to overheat at high temperatures. This, in turn, has a negative impact on burner efficiency. It has been found that inadequate vaporization of the fuel supplied to the burners will in most cases vaporize the fuel ineffectively resulting in high fuel consumption and below the optimum burner temperature.

It has also been found that the gas burner design of the flame units currently used for agriculture tends to inadequate land or crop areas by concentrating heat in a relatively narrow alignment. Current burners are large bunsen-type burners in which the vaporized gas is mixed with air and combusted to form a relatively high flame at 900-1200 ° C. Experiments have demonstrated that the temperature of the flame is extinguished rapidly despite the deformation of the mouse of the burner extending in the horizontal plane with respect to the ground to be treated. This makes it necessary to place the burners relatively close to each other in order to avoid the long ground of the ground being untreated due to lack of heat.

U.S. Patent No. 3486497 (Pivonka) poses a problem in treating large application areas with flame technology by releasing microfluidic fuels to the zone at high speed to broadly extend the fuel to ground level. This device is particularly used for roadside combustion and for cleaning of waterways and is usually used in handheld torches. In this device, therefore, the fuel vaporizes in an almost uncontrolled manner (aside from the control of the amount of fuel dispensed), so that the fuel vaporizes in the atmosphere after discharge and ignition and combustion occur. Therefore, such a device would seem inadequate to conventional flame cultivation.

Another way to increase the amount of heat directed to the area to be flamed using a flame cultivator with a burner group carried or attracted by a tractor is to align the burners on either side of the tilling heat so that the flames of the burner are concentrated from both sides (Holloway The burners are aligned with each other so that the flames pass continuously over the same area from both sides (as opposed to Paree's US Patent No. 3177922). Pardee also proposes a combined burner vaporizer that is supplied to each burner in liquid form to vaporize the LPG fuel in the relevant vaporizer before it is burned in the burner. The problem of the method of concentrating the flame of the burner on the relatively narrow treatment zone presented above still exists in these devices.

In addition, problems occur in flame treatment caused by overheating of crops, including damage to crop leaves. United States Patent No. 5189832 (Hoek et al.) Proposes one proposal to reduce heat damage to plants by forming a horizontal cold air film near the base of the plant to limit hot air that can damage leaves.

Flame treatment is also used in a limited range in connection with the heating of asphalt on surfaces such as asphalt roads where large amounts of heat are applied to surfaces of relatively large surface areas.

The present invention relates to a plant pest and weed removal and combustion apparatus, and more particularly to a plant pest and weed removal apparatus for thermally removing weeds and plant pests in the vicinity of plants of useful crops such as cotton, corn or lucerne. . In particular, the present invention relates to an improved gas burner structure, a modified vaporization device and an agricultural appliance using such a vaporization device and a burner.

1 is a view showing a flame cultivation mechanism towed by the tractor according to the present invention coupled to the vaporization unit according to the present invention.

FIG. 2 is a schematic front view of the instrument of FIG. 1 showing the flame burners aligned into a module group or bank; FIG.

FIG. 3 is a schematic diagram of a first fuel supply circuit of a burner arranged in a common bank or module used with a mechanism such as that of FIG. 2 using a (modified) single vaporizer used to supply gaseous fuel to all burners. FIG.

FIG. 4 shows a first fuel supply of a burner arranged in a common bank or module for use with a mechanism such as that of FIG. 2 having a number of vaporization sections for vaporizing fuel for the burner and a gas regulating control valve in the fuel supply line. Schematic diagram of the circuit.

5 is a schematic longitudinal sectional view of the first embodiment of the vaporizer according to the present invention.

6 is a schematic cross-sectional view showing a liquid inlet pipe and a metering portion of the vaporizer of FIG. 5.

7 is a schematic longitudinal sectional view of another vaporization mechanism example having an adjustable metering valve.

FIG. 8 is a schematic side view of the geometry heater using the vaporizer and the first structure of FIG. 5 aligned with the first structure; FIG.

FIG. 9 is a schematic side view of a vaporizer heater arranged in a second structure within a vaporizer and a common burner protection member using the vaporizer of FIG. 5; FIG.

10 is a schematic side cross-sectional view of another flame cultivation apparatus having a modified burner according to the present invention.

11 is an end view of the outlet of the modified burner shown in FIG. 10.

12 is a schematic side cross-sectional view of a flame cultivation device similar to FIG. 11 with another modified burner device in accordance with the present invention.

Figure 13 is a schematic side cross-sectional view of another modified flame cultivation device having another modified burner device according to the present invention.

14 is a side view of the sideplate of the appliance of FIG. 13;

15 is a schematic plan view of a bunsen burner used in the flame cultivation apparatus of FIGS. 1, 12, and 13;

16 is a schematic side cross-sectional view of a modified burner structure used in the instrument of FIG.

FIG. 17 is a front view of the burner structure of FIG. 16; FIG.

* Explanation of symbols for main parts of the drawings

10 Flame Cultivation Organization 12 Joki Fili

14 Ground connection 16 Crossbar

20 Bar linkage assembly 22 Link mechanism

24 burner 26 deflection plate

27 Sloped Part 28 Ground Joining Skid

29 Absorber 30 Vaporizer

32 Carburetor 34 Inlet Tube

36 Carburetor Housing 38 Carburetor

40 End Connection 42 Metering Orifice Member

44 End Connection 46 Gas End Connection

48 Needle Valve Assembly 50 Liquid Fuel Supply Line

52 Needle member 54 Valve socket member

56 Lock nut 58 Valve seat

59 Caps 60 Carburetor Burners

62 Nudge Jet Nozzle 64 Burner Casing

72 Burner Casing 74 Burner Mouse Opening

76 Net or mesh member 78 Burner nozzle support

80 Gas Jet Burner Nozzle 82 Mesh Material Cage

100 Fuel Tank 102, 104 Solenoid Valve

114 Burner Bank 124 Burner

126 Burner Cover 129 Burner Mouse

130 Carburetor 132 Carburetor

160 burner 170 regulating valve

172 Stop Valve 214 Burner Bank

224 Burner 230 Carburetor

232 Carburetor 247 Manifold Pipe System

270, 271 Pressure regulating valves 273 Stop valves

326 burner cover

It is an object of the present invention to provide a vaporizer for LPG fuel, such as propane or propane / butane mixtures, which at least partially addresses the problems of the prior art and which may contribute to improved gas burner efficiency.

Therefore, it would be desirable if the present invention provides a vaporizer design that can reduce the number of vaporizers required to vaporize the amount of LPG required to supply a large number of burners, for example, a large vaporizer that can vaporize a large amount of fuel.

In addition, the LPG fuel vaporizer according to the present invention is not only used for agriculture but also for high heat output flame cultivators and other apparatuses used for controlling weeds and pests for other purposes including weed removal in public areas, narrow roads, and the like. It would be advantageous if it could be used.

It is another object of the present invention to provide a burner apparatus that can be used for agricultural machinery for crop flame treatment, in which a large amount of heat can be applied more uniformly to a larger treatment area than can be achieved with a conventional burner.

According to a first aspect of the invention, the invention provides a burner housing comprising a burner chamber having at least one inlet for combustion air and an outlet arranged to direct flames and heat into the treatment zone, and to transfer gaseous fuel into the burner chamber. At least one fuel delivery jet located in the burner chamber for the purpose of being disposed in the burner chamber at or near the outlet, the net or mesh insert being arranged to enhance the diffusion of the combustion gases and to widen the flame from the outlet. Bunsen-type main burner having; In operation, the flame coming from the outlet of the booster burner collides with the flame of the main burner so that the bunsen-type booster burner mounted adjacent to the main burner is installed to improve the flame speed and flame extension of the combined flame into the treatment zone. Provided are a gas burner device for weed and plant pest combustion control mechanism.

According to the present invention it has surprisingly been found that a wider surface can be treated with a burner of a given size by inserting a mesh or mesh member into the mixing chamber at or near the burner mouse. The mesh or mesh member reduces the speed of the mixture in the burner chamber to improve the diffusion of the air / gas mixture and has the effect of allowing the heat to expand more over a large area near the burner mouse. Conveniently the net or mesh material is formed with a concave interior surface and an outlet therefrom that extends completely across the burner chamber. Preferably the size of the mesh holes should not exceed 2 mm for best results. The mesh insert is preferably made of a heat resistant material of the kind sold under the trademark INCANOL.

However, the provision of a net or mesh insertion member mitigates the intensity of the flame at the main burner mouse in terms of both the speed and impact of the flame at the point of application of the ground surface, and the heat of combustion from the burner is always properly concentrated in the treated surface area.

This opposes the booster burner by directing the booster burner to the same treatment zone of the main burner, further concentrating the flame at the ground level of the treatment zone and maintaining heat. This method also improves the flame speed in the vicinity of the insertion burner. The booster bunsen burners, which preferably provide additional heat, are of standard construction and do not have a net or mesh insert, and form a burner chamber in which at least one gaseous fuel delivery jet is located, which extends toward the outlet mouse of the burner housing. It may have a burner housing having a front flare. Thus, the additional heat provided to the treatment zones is directed at a greater speed and concentration than the flames provided by the burners with only nets or mesh inserts. The additional heat will lead to longer downtimes for weed and pest control in various crops.

Such burners have been found to allow for uniform expansion of hot combustion gases under the covers, with covers or skirts that are pulled behind agricultural vehicles such as tractors, and have been found to be particularly effective in controlling weeds and pests associated with crop cultivation.

Thus, according to another aspect of the present invention, the above-defined arrangement is arranged so as to direct heat below the cover member of the ground engaging structure, which is arranged to be dragged by or mounted to the tractor, and the ground engaging structure arranged to cover the flame treatment zone. And a plurality of main burners, each associated with each burner in the main burner, the outlet of which is directed through each opening of the cover member and the emitting flames collide with each other to cause the associated main burner to join the respective treatment zones. A farming apparatus for flame cultivation of arable land is provided with a plurality of booster burners, as defined above, mounted above the cover member to enhance the flame speed and flame spread of the combined flame.

This apparatus can take many forms depending on the purpose for which it is used. In conventional row crops, the apparatus can be used, for example, for weed control of heat resistant cotton or corn or similar crops. This apparatus is a burner section which directs the heat to the weeds around the base of the plant and moves the burners between the rows of plants with the protection associated with the burner to protect the leaves of the plant from damage caused by heat radiation or air ventilation. (Main burner and booster burner) can be provided.

In certain cases, the apparatus may be a device that is towed to a relatively large tractor that is suitable for handling large areas during tillage. Alternatively, the instrument may be a relatively small instrument having a single or small burner array suitable for manual operation.

The burner device using a main burner having a net or mesh member is also useful for hand-holding and manipulating in areas that can be limited or inaccessible to conventional machines.

According to another aspect of the present invention, the present invention is LPG for weed and plant pest combustion control mechanism comprising a vaporizer for vaporizing liquefied petroleum gas (LPG) and a vaporizer heater for supplying the vaporization heat to the vaporizer to achieve the vaporization A vaporizer comprising: a tubular vaporizer housing constituting a vaporization chamber therein, a fuel delivery tube extending into the vaporizer housing and arranged to receive LPG from the LPG storage source in a fluid state and to deliver the vaporizer to the vaporization chamber; Liquid fuel metering in communication with the vaporization chamber, having a gas delivery outlet arranged to deliver gaseous LPG for subsequent use, and an orifice arranged to limit the amount of weak fuel flowing through the delivery tube into the vaporization chamber to a predetermined amount. And a vaporizer heater arranged to direct the flame towards the vaporizer housing to heat the vaporization chamber. A bunsen-type burner, the orifice of the metering member, provides a vaporization apparatus which is located in the fuel delivery tube in the heating zone of the vaporizer housing.

The metering orifice, which is actually a flow regulator, is placed in or very close to the vaporization chamber within the zone that receives the heating energy from the vaporizer burner, thereby freezing the fuel pipeline and connections located upstream of the vaporizer comprising the flow regulator. It will be found that the related problems are minimized. This in turn results in a more stable and consistent supply of the fuel in one state (i.e., a liquid that is not partially vaporized as in the case of conventional devices) to a more stable and constant vaporizer, resulting in better control of vaporization so that the fully vaporized fuel is To be supplied. Therefore, the gaseous fuel can be pressure-controlled in a conventional manner before the gaseous fuel is supplied to the burners of the weed or pest heat control mechanism.

Conveniently the vaporizer can generate the gaseous fuel required for the operation of the gas burner associated therewith.

According to another aspect of the present invention, there is provided a vaporizer for LPG fuel as described above, wherein the metering member preferably has a relatively large orifice of 1 mm or more. This makes it possible to design a carburetor with a larger inlet flow capacity for fuel and thus to vaporize in one apparatus the fuel required for a number of burners, such as those used in agricultural flame harvesters of the kind mentioned above. The use of large metering orifices has the added advantage of being less prone to clogging due to dirt particles or impurities in the liquid fuel. It is also easy to remove any blockages that may still occur.

Continuous supply of fully evaporated fuel allows the conventional gas pressure and flow control techniques to be used on the output side of the carburetor, so that the gas at the optimum performance level over an indefinite long time with little or no change in the flow pattern of the evaporated fuel. The burner can be operated.

Hereinafter, exemplary embodiments will be described with reference to the accompanying drawings.

Referring first to FIGS. 1 and 2, these figures utilize various aspects of the present invention and may be mounted to a hitch of a tractor (not shown) by a jockey wheel 12. , The flame cultivation mechanism 10 that the tractor pulls is shown. The flame cultivation mechanism 10 is composed of a plurality of ground engaging portions 14 (five are shown in FIG. 2) supported by a main crossbar 16 having side ends 16a and 16b pivoted at 18. Thus, as schematically shown in FIG. 2, the outermost engagement portion of the ground engagement portion 14 is pivoted back to itself, allowing the width of the instrument to be reduced while traveling on the roadway. Each ground engaging portion 14 may be elevated relative to the ground around the two bar linkage assemblies 20 via the link mechanism 22.

The ground engaging portion 14 of the cultivation device 10 is arranged in blocks or tools and positioned around the deflection plate 26 to direct heat towards the ground and downwards of the deflection plate 26. Burner 24 (four burners per block in FIG. 2). The deflection plate allows the upward flow of heat from the burner 24 to be minimized, as will be described later with reference to specific examples of the cultivation apparatus shown in FIGS. 10 and 12. The ground engaging portion 14 may also have a ground skid indicated by reference numeral 28 in FIG. 1. The structure of the cultivator can vary depending on whether it is used for the treatment of aligned crops, such as cotton or corn, for example, Lucerne, or for pasture crops.

Each burner 24 of the cultivation device 10 is a large bunsen-type burner in which the vaporized fuel is mixed with air and combusted to form a relatively hot flame at 900-1,200 ° C. Burner 24 utilizes gaseous LPG. Until now, it is necessary to vaporize fuel stored in a liquid state under pressure in a tank loaded on a tractor before delivery to each burner 24. This is achieved by using one or more vaporizers that can be aligned in the fuel supply circuit in a manner described in more detail below with reference to FIGS. 3 and 4, one of which is schematically illustrated.

First, in a possible vaporization embodiment according to the present invention, FIGS. 5 and 7 show the structural features and arrangement of two vaporization mechanism examples, respectively, while FIGS. 8 and 9 are for supplying a vaporizer and heat to the vaporizer. The structural features and arrangement of two different vaporizers, consisting of the associated heater device used, are shown.

The vaporizer 32 shown in FIG. 5 has an inlet tube 34 fixed in the vaporizer housing 36 which provides a vaporization chamber 38. Inlet tube 34 is arranged to be directly connected to the LPG supply tank (not shown) via the hose 40 through the hose. The metering orifice member 42 is detachably fixed to the distal end of the inlet tube 34 by the connector 44. The carburetor housing 36 is provided with a gas connector 46 for allowing gaseous fuel generated in the vaporization chamber 38 to pass through and flow out.

Referring to FIG. 7, there is shown a deformer vaporizer 32 ′ similar to the carburetor described above except that the needle valve assembly 48 is replaced in place of the metering orifice member 42 shown in FIG. 6. The valve assembly 48 is disposed at the inlet end of the inlet tube 34, and has a connector for connecting with the liquid fuel supply line or the hose 50 to the LPG storage tank. The needle valve assembly 48 has a needle member 52 movably housed in the valve socket head 54.

The needle member 52 is screwed into the lock nut 56 and interacts to allow the needle member 52 to move or be fixed by setting the needle point for the desired valve seat 58 in the inlet tube 34 of the vaporizer. Control the flow of liquid LPG flowing into it. Therefore, the valve seat 58 provides a variablely adjustable metering orifice. Cap 59 may be provided to cover the rear end of sockethead 54. Also shown in FIG. 7 is a conduit 47 connected to the gas connector 46, which is used to drain gaseous LPG fuel.

8 and 9 are essentially jet jet nozzles 62 of the burner for supplying the heat necessary for vaporizing the vaporizer and LPG fuel entering the vaporizer through the metering orifice member 42 or the valve seat 58 as described above. An embodiment of two different vaporization sections, consisting of a vaporizer burner 60 arranged to impinge and heat a flame emitted from the vaporizer housing 36, is shown. In FIG. 8, the burner and carburetor are arranged at an angle to each other, whereas in the embodiment shown in FIG. 9, the carburetor 32 is mounted in the burner casing or cover 64 on the opposite side of the jet 62 of the burner. The burner casing is provided with a pore 66 to supply adequate air to the Bunsen burner 60 as shown.

It has been found that the heating effect of the vaporization chamber 38 is greatest in the vaporization section 30 of FIG. 9 in which the burner 60 and the vaporizer 32 are arranged in the burner casing 64.

In operation of the vaporization section of the type as shown, liquid LPG fuel is delivered from the storage tank under pressure to the vaporizer 32 via a hose 50 where the fuel is passed via an inlet tube 34 and a metering orifice member ( 42 is supplied into the vaporization chamber 38 in a metering manner via the needle valve 48 (FIG. 7). When heating the vaporizer housing 36 and the vaporization chamber 38 with a flame from the burner 60, the released liquid LPG vaporizes in a high temperature environment in the vaporization chamber 38, where the gaseous LPG is described later. As for other purposes it is discharged through gas connector 46 and line 47.

A large amount of heat must be transferred to and absorbed by the fuel to achieve complete vaporization of the liquid fuel, which will significantly expand the fuel in the vaporization chamber 38. Therefore, the heater 60 should have as much size as desired. In addition, as described exemplarily hereinafter, in order to supply sufficient fuel in liquid phase to satisfy the gaseous requirements or requirements of the burner banks operating in the specific fuel circuits of the six burners supplied by one vaporization unit. The metering orifice member 42 should be selected to be of a predetermined size.

3 and 4 schematically show two different forms of the fuel supply circuit for the burner bank device used in the flame cultivation apparatus according to the present invention as described with reference to FIG. FIG. 3 shows only four burner banks 114 (compared to the five burner banks / ground engaging portions 14 shown in FIG. 1) each having four burners (indicated by reference numeral 124) and all burners 124. It will be seen that the fuel vaporization unit 130, which serves to supply gaseous fuel through the fuel supply circuit.

4 shows six banks 214, each with three burners 224, provided in the flame cultivation mechanism and five smaller in capacity than those in FIG. 9 to provide gaseous fuel to all burner banks 214. The vaporization unit 230 shows an arrangement connected to the fuel supply circuit. In the arrangement of FIG. 4, after the liquid LPG is supplied through the manifold line 25 to the vaporizer 232 of the vaporizer 230, the gaseous fuel exiting the vaporizer 232 is manifolded for subsequent distribution. It is fed into system 247 and to burner 224 of bank 214 via pressure regulating valve 270 or 271. Depending on the number of burners 224 actually operating in the cultivation device, valve 270 may be a small volumetric flow regulator while valve 271 may be an alternative flow regulator. Each burner 224 may be provided with a stop valve for controlling the flow of gas supplied to each burner, as indicated at 272. A stop valve 273 is also provided to control the gas flow to the burners 214 of each bank.

In FIG. 3, sixteen burners 24 are arranged in four banks 114, arranged to supply gaseous LPG from a single vaporization unit 130 through a common supply circuit. The liquid LPG is stored in the storage tank 60 controlled by the stop valve 61 and conveyed to the vaporization unit 130 through an appropriate hose in which the other stop valve 62 is located under pressure. The vaporization unit 130 is discharged into the vaporization chamber through the metering orifice at each end of the inlet tube (not shown) of the elongated small diameter vaporizer. The volume of fuel to be consumed by the burner 24 of the bank 114 is completely vaporized before being dispensed to the burner. This is not only done to avoid inadequate use of the fuel, but also makes it possible to better control the gaseous fuel flow to the burner as compared to liquid fuel flow control. One of the burners of one bank 114, indicated at 160, acts as a vaporizer burner for transferring the vaporization heat required by the vaporizer 132.

The control of fuel flow of the illustrated circuit is basically performed in two stages: the first stage in which the vaporizer 132 and the fuel supplied thereto are preheated to ignite the pilot burner 160 and the other bank 114. And a second step of igniting all or a predetermined number of burners 124. Burner 160 is arranged to provide sufficient heat to vaporized vaporizer 132 sized to allow sufficient liquid fuel to enter and convert to gaseous fuel to meet the fuel requirements of all burners 124. The fuel supply to 114 is controlled in the gas state by the control valve 170. Gas flow from the regulator 170 to the burner bank 114 is controlled by the stop valve 172.

The inlet tube of the vaporizer 132 is designed to allow a relatively large flow rate of liquid fuel to flow into the vaporization chamber in order to satisfy the requirements of all burner banks 114, so that the metering orifice (fixed state or the vaporization mechanism of FIG. Contrast), the size of the adjustable state (compared with the vaporization mechanism example of FIG. 7) is preferably relatively large, preferably 1 mm or more, thereby minimizing the possibility of clogging in the inlet and the metering tube at the same time.

In addition, the vaporizer burner 160 of the vaporization unit 130 serving as a gas fuel supply source for the burner bank 114 is controlled in accordance with the temperature of the gas fuel at the outlet of the vaporization chamber and before entering the regulator 170 ( And to control the vaporization of the fuel in the vaporizer. This not only achieves a self-help insulation supply system, but also protects the regulator from overheated gaseous fuel, which can cause premature failure of the regulator. Liquid flow from the fuel tank 100 is controlled by solenoid valves 102 and 104 while the flow of liquid fuel into the vaporizer is controlled by the orifice (of the correct size) of the metering orifice member 42 (FIG. 5) of the vaporizer. Or is controlled by the needle valve assembly 48 (FIG. 7) of the vaporizer and is also affected by the line pressure between the vaporizer outlet and the regulator 170, which pressure is approximately equal to the liquid pressure in the tank and the regulator 170. This is a difference from the downstream pressure between the burners 124 (the line pressure loss is ignored). However, this pressure varies with the amount of gaseous fuel consumed by burner 124. If the fuel consumption exceeds the capacity of the metering orifice to allow sufficient liquid fuel to pass into the vaporization chamber and continue to be supplied with heat by the vaporizer heater 160, the temperature of the gaseous fuel will rise. Accordingly, the temperature control switch then regulates the fuel supply to the carburetor burner 160 to allow the gaseous fuel supplied by the carburetor 132 and the carburetor to be relatively cooled.

The combination of the orifice and pressure and temperature controls will ensure the safe and efficient operation of the entire instrument / equipment.

10 and 11 will be described an actual flame cultivation mechanism having a modified burner according to the present invention. The flame cultivation mechanism is similar to that described with reference to FIG. 1, but the arrangement and structure of the burner indicated at 70 in FIG. 10 have been modified in accordance with one aspect of the present invention. The burner 70 deflects the flames under the deflecting skirt (or plate) 26 of the planting mechanism provided in the inclined portion 27 arranged to deflect the flames of the burner and to deflect heat downward toward the ground on which the planting apparatus moves. It is mounted so as to fire approximately horizontally, and this growing device is connected to the ground coupling skid 28 and the like as the growing device of FIG. 1. A hole 27a may be located in the deflector 26 so that a portion of the heat is released onto the absorber 29 each time the ground engaging skid is connected. The skids 28 are spaced according to the requirements of the particular crop.

Burner 70 has a burner casing or lid 72 conveniently formed of a thin tubular sheet metal having heat resistance. The burner casing 72 has one end pressed to form a rectangular burner mouse opening 74 to which a net or mesh member 76, also made of heat resistant material, is mounted. A burner nozzle support 78 for supporting one or more gas jet burner nozzles 80 is mounted in a burner casing 72 that provides an air inlet for combustion air at the rear. A cage 82 of mesh material covers the open rear of the casing 72 to prevent ventilation of the burner gas flame and subsequent entry of foreign matter into the burner stall formed by the " burning back "

The burner outlet covering the net member 76 is preferably made of Incanol (trademark) or similar heat resistant material. The surface of the net member 76 is pressed into the burner cover 72 to form a curved recessed surface on the burner mouse 326. This method provides a controlled burner flame in which the hot zone surrounding each burner is maximized, resulting in a wider field surface that can be treated with a burner of a given size and minimizing the drawbacks of previous bunsen burner designs known to the inventors. Was found. The net or mesh member has the effect of improving the diffusion of the air / gas mixture by reducing the speed of the mixture in the burner lid chamber, thereby allowing the heat to expand more widely over a large area near the burner. Preferably the size of the mesh holes should not exceed 2 mm for best results.

The burner design according to FIG. 10 has also been found to allow the hot combustion gases underneath the cover to expand uniformly when used in conjunction with a sheathing or skirt (as provided by the cultivator deflector 26). It has been found to be particularly effective in controlling weeds and pests associated with similar crops.

FIG. 12 shows another modified flame cultivation mechanism similar to that of FIG. 11 but with additional burners 124 arranged as shown, preferably one burner for each main burner 70. Except for the addition of burner 124 schematically shown in FIG. 15, the structure of the planter is similar to that shown in FIG.

The burner flame of the burner (the burner is provided with a net diffusion insert 76), which passes through the hole of the skirt 26 where the mouse of the burner 124 is properly positioned and the combustion flame from the burner is mounted under the skirt. An additional burner 124 is preferably supported on top of the cover or skirt 26 of the growing implement so that it is guided to impinge at an angle of incidence. As can be seen in FIG. 15, the burner 124, which is a bunsen-type burner having a structure similar to that of the burner 24 used in the flame cultivator of FIG. 1, guides the burner flame toward the front housing of the flare type (branch type). It has a box-like cover or housing 126 that forms a burner chamber in which one or more burner jet nozzles 128 are supported in a known manner to exit from burner mouse 129. The flared outlet can guide the flame to cover a relatively large area at a relatively high speed.

The number of active burners 124 that can be varied depending on the requirements of a particular flame state can be controlled by the temperature of the combustion gases concentrated under the lid member 26 and surrounds the crops to be treated, the amount of water, the crop material, and the like. It will be appreciated that we can consider factors such as application characteristics including weeds.

The burner 124 is arranged to generate a flame having a higher temperature and higher speed than that obtainable by the burner 70 provided with only the net insert 76 (as with the burner 24), and thus the net burner and When combined, it acts as a "booster", thus producing a hotter flame with a wider reach and extension compared to a single burner operation and consequently covering a relatively large area in the treatment zone under the lid member.

The cover member (or deflection plate assembly) of the flame mechanism shown in FIGS. 11 and 13 concentrates the heat generated by the burners 70 and 124 at ground level and flames the crop, eg alfalfa / grass crops. It will be appreciated that it has an optional feature that helps maintain heat in the most useful areas. It will also be appreciated that the layout of burner 124 can be changed as needed, but it has been found that burner casing 126 should be an open structure without nets or mesh inserts as provided in burner 70. .

FIG. 13 shows another modified flame mechanism similar to that described above, except for the features mentioned below. 16 and 17, the main burner 70 is provided with a net member 76 on the burner mouse or the outlet 74 as described above, but the burner casing 72 has the burner mesh. It consists of a rear portion 72a covered by the cage 82 and a relatively angled front portion 72b flared toward the burner mouse insert net 76. As can be seen in FIG. 13, the main burner 70 is disposed in the cultivation apparatus frame 26a so that the flame coming from it is directed at an acute angle horizontally toward the ground, and is adjacently arranged to interact with the flame to concentrate towards the ground. The cultivation tool 26a supports a plurality of air deflection foils 26b as shown to maintain the hot air vents generated by the burners 70 and 124 under the cultivation device cover facing downward toward the ground. Fig. 14 shows a side plate 26d supported by the cultivation mechanism frame 26a and supporting the lateral windproof member 26c.

As described above, according to the present invention, it is possible to contribute to the improvement of the efficiency of the gas burner, and a large amount of heat can be applied more uniformly to a larger processing area than can be achieved with the conventional burner.

Claims (19)

A burner housing comprising a burner chamber having at least one inlet for combustion air and an outlet arranged to direct flames and heat into the treatment zone, and at least one fuel delivery located in the burner chamber for delivering gas fuel to the burner chamber. A bunsen-type main burner having a jet and a net or mesh insert member positioned in the burner chamber at or near the outlet and arranged to enhance the diffusion of the combustion gas and to widen the flame from the outlet; During operation, the flame coming from the outlet of the booster burner collides with the flame of the main burner, so that the bunsen-type booster burner mounted adjacent to the main burner is installed to improve the flame speed and flame expansion of the combined flame into the treatment zone. Gas burner device for weed and plant pest combustion control mechanism, characterized in that provided. The gas burner apparatus according to claim 1, wherein the net or mesh insert member is disposed adjacent to the flame outlet to cover the flame outlet, and the insert member has a concave surface bent toward the burner chamber. 3. The gas burner device according to claim 2, wherein the net or mesh insert member has a mesh hole whose size does not exceed 2 mm. 4. The burner housing according to any one of claims 1 to 3, wherein the booster burner has a burner housing that forms a burner chamber in which at least one gaseous fuel delivery jet is located, and the burner housing is flared to extend toward the outlet mouse of the burner housing. Gas burner device having a front portion. 5. The gas burner device according to any one of claims 1 to 4, wherein the burner housing of the main burner is composed of a thin sheet metal tubular cover having one end pressed to form a rectangular shape providing an outlet opening. 6. The air inlet of claim 5, wherein an air inlet is provided at the opposite end of the rectangular outlet, the cage of mesh material covering the air inlet in a manner to prevent ventilation in the burner housing causing a gas flame burn back in the burner housing. Gas burner device. Ground engaging structures arranged to be attracted to or mounted by the tractor, A plurality of main burners as defined in any one of claims 1 to 6 arranged to direct heat under the cover member of the ground engaging structure arranged to cover the flame treatment zone; Respectively associated with each burner in the main burner, the outlet of which is directed through each opening of the cover member and the emitting flames collide with the flames of the associated main burner to cause the flame speed and flame extension of the combined flame to the respective treatment zones. 7. A farm equipment for arable farmland for arable land, comprising a plurality of booster burners as defined in any one of claims 1 to 6 mounted on the cover member to improve the efficiency. 8. The agricultural implement according to claim 7, wherein the ground engagement structure has a plurality of deflection foils or vanes arranged to direct the air heated by the burner downward to the ground level. In the LPG vaporizing apparatus for weed and plant pest combustion control mechanism, comprising a vaporizer for vaporizing liquefied petroleum gas (LPG) and a vaporizer heater for supplying vaporization heat to the vaporizer to achieve the vaporization, the vaporizer is, Tubular vaporizer housing forming a vaporization chamber therein, A fuel delivery tube extending into the vaporizer housing and arranged to receive the LPG from the LPG storage source in a fluid state and to deliver it to the vaporization chamber; A gas delivery outlet in communication with the vaporization chamber and arranged to deliver gaseous LPG for subsequent use; And a liquid fuel metering member having an orifice arranged to limit the weak fuel flowing into the vaporization chamber through the delivery pipe to a predetermined amount, The vaporizer heater has a bunsen-type burner arranged to direct the flame toward the vaporizer housing to heat the vaporization chamber, An orifice of the metering member is located in the fuel delivery tube in the heating zone of the carburetor housing. 10. The vaporization apparatus according to claim 9, wherein the metering member includes a fixed orifice member attached to a distal end of the fuel delivery tube in the vaporization chamber. 10. The vaporization of claim 9 wherein the metering member comprises a needle valve providing an orifice of adjustable size located at the inlet side of the fuel delivery tube to enable the flow of liquid fuel into the vaporization chamber. Device. The vaporization apparatus of claim 9, 10 or 11, wherein the orifice has a diameter of at least 1 mm. 13. The carburetor housing and the bunsen-type carburetor heater are arranged in an axial direction, and the cover member of the carburetor heater is arranged to surround at least the front end of the carburetor housing. Vaporizer. A ground engaging structure arranged to be attracted to or mounted by the tractor, A plurality of burners positioned in the ground coupling structure spaced apart to direct the flames to the respective flame treatment zones, A fuel delivery circuit having a tube arranged to deliver fuel from the LPG fuel source to each burner, The vaporizer fuel delivery tube is in fluid communication with the fuel source and the vaporizer gas delivery outlet is in fluid communication with the manifold tube arranged to deliver the gas fuel to the burner, and the liquid LPG is removed from the fuel source such that the metering member has an orifice of at least 1 mm. A vaporization apparatus according to any one of claims 9 to 13 disposed in a fuel delivery circuit for receiving and delivering gaseous LPG to a burner; Flow control of LPG in the liquid state is done only by the metering member of the carburetor and flow control of LPG in the gas state is performed on the downstream side of the carburetor by the gas pressure regulator so that the fuel flow to the burner can be more precisely controlled. And a gas pressure regulator disposed in the fuel delivery circuit between the vaporizer gas delivery outlet and the burner to control fuel supply. Ground engaging structures arranged to be attracted to or mounted by the tractor, A plurality of burners disposed in the burner bank, each of which is located on the ground-coupled structure spaced apart to direct the flames to the respective flame treatment zones and composed of a predetermined number of burners; A fuel delivery circuit having a tube arranged to deliver fuel from the LPG fuel source to each burner bank, Receive LPG from the fuel source so that the fuel delivery tube of each vaporizer is in fluid communication with the fuel source and the gas delivery outlet of each vaporizer is in fluid communication with a manifold tube arranged to deliver gaseous fuel to the associated bank in the burner bank. 14. A plurality of vaporization apparatus according to any one of claims 9 to 13 disposed in a fuel delivery circuit for delivering gaseous LPG to a burner bank, wherein one is provided for each burner bank; The flow control of the weak LPG is controlled only by the metering member of each vaporizer, and the flow control of LPG in the gas phase is performed downstream of each vaporizer by each gas pressure regulator to control fuel flow to the burner bank. A farming device for arable farms for arable land, comprising a plurality of gas pressure regulators disposed in fuel delivery manifold pipes to each burner bank to allow more precise adjustment. 16. The agricultural implement of claim 14 or 15, further comprising a plurality of stop valves for controlling the flow of gaseous fuel to each burner and optionally to each burner of the bank. 17. A controller according to claim 14, 15 or 16, further adapted to regulate fuel flow to the heater burner of the vaporizer in accordance with the temperature of the vaporized fuel delivered to the gas pressure regulator through the gas delivery outlet of the vaporizer. Agricultural equipment, characterized in that configured. 18. The agricultural implement of claim 17, wherein the controller comprises a temperature control switch for shutting off fuel supply to the heater burner of the carburetor. 19. An agricultural implement as claimed in any one of claims 14 to 18, wherein the burner consists of a gas burner according to any one of claims 1 to 6.