CN1224332A - Improved concentrated heat agricultural flame cultivator apparatus - Google Patents

Abstract

An agricultural flame cultivator is disclosed comprising a burner construction of bunsen burner type having a gas inlet, a mixing chamber and a burner outlet, the burner outlet includes a gauze or mesh member 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 a metering means is provided for controlling the flow of liquid fuel into the vaporiser, the metering means being located in the vaporiser chamber or closely adjacent thereto to minimise 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

The agricultural flame cultivator apparatus that improved heat is concentrated

Background of invention

The present invention relates to kill the equipment of flammable plant insect and weeds, relate in particular to heat and kill weeds and plant insect near valuable crops such as cotton, grain or clover.Specifically, the present invention relates to a kind of improved gas burner structure, a kind of relevant farm implements and a kind of improved evaporation structure.

Usually use chemical herbicide and insecticide in agricultural, still, what allow all the time the people worries is owing to use this chemicals to make environment and crops deterioration.

Suppose that farm implements estimate to handle a sheet of commercial soil rapidly, in these farm implements, use combustion apparatus a large amount of fuel need be fed in a large amount of burners.

The bulk container burner must cause keeping enough fuel supply problems with best combustion efficient to burner.

Plurality of devices is disclosed in the prior art, they have pointed out to be used for the structure of the evaporator of this machinery, comprise No. the 3357474th, United States Patent (USP) (Pivonka), it discloses a kind of LPG burner/evaporator, but and be designed to guarantee the evaporation of evaporated fuel such as the butane/propane admixture of gas, be purpose with the two-forty combustion fuel relevant with the size of burner.

Equally; United States Patent (USP) No. 3645664 (Clinton) relates to a kind of evaporator; what wherein will protect is; few or the mode that do not have of the flue gas of discharging into the atmosphere to guarantee full combustion of fuel; the propane fuel of evaporation is fed in the burner, thereby makes evaporator with higher efficient operation.

In using, agricultural controls weeds and insect with the flame treatment or the flame of getting angry.The flame of getting angry is included in uses the high-strength hot amount in the short time, but is enough to produce cytoclasis in the leaf of weeds and stem, and kills the nuisance such as for example Bacillus, weevil, insect or the mycotic spore etc. of attacking valuable crops plant probably.

Flame treatment also is used for the limited range of the pitch heating on the relevant asphalt roads and similarly applies the surface of a large amount of heats on suitable high surface area.

The existing problem of the flame treatment in crops is comprised the leaf destruction that causes by overheated to the crops plant.

United States Patent (USP) the 5189832nd people such as () Hoek discloses and has a kind ofly risen with the hot-air that prevention can destroy leaf by form level cooling air curtain near the plant matrix, reduces the imagination of heat to the destruction of plant.

The liquid fuel that the known present LPG combustion apparatus (example of top indication) of applicant has in evaporator evaporates uneven problem.

This problem may be by before evaporation and to need to regulate the flow of pressurized liquid fuel before it is sent to evaporator caused.

This will inevitably cause the evaporating with the evaporating liquid that is produced to small part of liquid downstream of adjuster to absorb heat, thereby causes freezing of pipeline and accessory and regulator valve.

This means that evaporator accepted fuel, and these fuel may be the part evaporations according to the temperature of the downstream line between valve and the evaporator, or evaporation fully in some cases, and also all be liquid in other cases.

Fuel temperature in the pipeline can change in about 25 ℃ of environmental temperatures with between-420 ℃ of propane fuel boiling temperatures.

It is insufficient or to the fuel superheater of high temperature to deliver to evaporation that so wide temperature range of evaporator may cause fuel.Have been found that the insufficient meeting of evaporation causes the burning of fuel in most of the cases inoperative or efficient is low, and this can cause that the high flow rate of fuel and temperature are lower than the best combustion actuator temperature.

Have been found that, if complete possible words, get angry that the burner temperature should remain on the constant high degree in the flame equipment, because this helps for the farm implements given speed of service and only need burner and evaporator done to make in time expand of minimum adjustment to get angry the orderly function of flame equipment on the ground.

The flame treatment of plant weeds does not need plant weeds Actual combustion, and only is that the temperature that comprises the leaf cells of plant weeds is increased to about 50 to 70 ℃ suddenly.Cause leaf and the stem of plant weeds withered like this, finally cause responsive weeds to die.

Like this, farm implements are according to various factors, such as the size of moisture, surface temperature and combustor flame temperature and plant weeds, have and reach per hour 7 kilometers ground speed.

Farm implements are also being adopted similar suggestion aspect the device that kills off the insect pests.

United States Patent (USP) No. 3486497 (Pivonka) is intended to solve a problem, promptly with getting angry the technology of flame, forms the fuel of a large amount of diffusions by discharge liquid fuel thread at full speed on the ground to a zone, reaches big overlay area.This device is particularly useful for the cleaning at roadside burning and irrigation passage.

Therefore, in this structure, fuel evaporates in atmosphere after discharging, and lights when liquid evaporation and burns.

Summary of the invention

An object of the present invention is to provide a kind of evaporator that is used for such as the LPG fuel of propane or propane/butane mix, the small part that arrives has obtained overcoming above-mentioned shortcoming in the prior art by reaching improved gas burner efficient.

Also have a purpose to provide a kind of LPG fuel vaporizer and useful equipment in control weeds and insect (but being not limited to) that is used for high temperature output farm implements in agricultural.

Find that also this equipment can be used for local control to weeds such as public arena or passage.

A further object of the present invention is to guarantee to be installed in each burner in the farm implements heat to be applied to equably on the maximum area in the zone.Have been found that existing gas burner structures can make heat concentrate on the several rows that are rather narrow, and causes part ground or crops undertreatment thus.

In addition, about evaporator, suggestion provides high capacity evaporator a kind of negligible amounts or single, and this evaporator can evaporate a large amount of fuel to many burners.This evaporator has higher efficient, also allows to use a bigger hole or a plurality of hole in measurement mechanism, makes the possibility of the obstruction in the evaporator hole reduce to minimum thus.

Evaporator

According to the invention provides a kind of evaporator, it is used for such as the suitable propane that uses with flame, weeds and pest control device or liquid petroleum gas (LPG) fuel of propane/butane mix, wherein evaporator comprises: the heater assembly that is used to hold fuel that a chamber and is associated, in this chamber,, evaporate fuel wherein by this heater assembly heating; Restriction flows to the measurement mechanism of flow of the liquid fuel in the chamber, this measurement mechanism be positioned at chamber or with its next-door neighbour, make the fuel quantity between measurement mechanism and the heater minimum.

Measurement mechanism can comprise adjusting device selectively, so that can adjust the fluid flow that flows through measurement mechanism.

In another aspect of the present invention, provide an evaporator that is used for being lower than such as boiling point the LPG fuel of 0 ℃ propane or propane/butane mix, this evaporator comprises: the gas burner heater; The chamber of one receiving fluids LPG gas and in chamber an or adjacent measurement mechanism, when being heated, fuel is used for the flow that fuel limitation flows to chamber, realized that thus fuel controlledly evaporates, thereby can carry out traditional pressure regulation of gaseous fuel, so that deliver to the control weeds of a heating or the farm implements of insect.

Because measurement mechanism is arranged within the chamber, will find that relevant fuel channel and the ice formation issues that comprises the accessory of flow regulator drop to minimum, evaporator just can be supplied the constant fuel that evaporates fully like this.

Generally speaking, evaporator and one or several are supplied with combined by the gas burner of the fuel of this evaporator evaporation.

Of the present invention aspect another, suggestion provides a kind of to have jumbo and can be the evaporator of many burner evaporated fuels, and evaporator can use a bigger measured hole, and is unlikely to have the tendency of obstruction.In addition, also cleaning easily of still contingent any obstruction.

Of the present invention aspect another, a kind of evaporator that is used for such as the LPG fuel of propane or propane/butane is provided, it comprises an elongate tubular member and the heater assembly that is used to hold described LPG fuel that is associated, evaporator is heated apparatus heating evaporation fuel, and fuel enters tube-like piece by the relatively large measurement mechanism in aperture.

Evaporator has one or several than common big hole, makes the possibility minimum of blocking because of dirt particles in the fuel or analog thus.

In addition, evaporator has enough capacity and supplies a gas in one group of many burner, such as being used in the agricultural flame cultivator that class our previous application above-mentioned describes in detail.

Zheng Fa fuel is without interruption fully can adopt traditional gas pressure and Flow-rate adjustment technology at the outlet side of evaporator, can make again thus gas burner the evaporation fuel flow rate seldom change or indeclinable situation under, in uncertain prolonging period, operate in the optimum performance state.

Evaporator generally supplies a gas in one group of about 3 or 6 burners, and these burners are installed on the farm implements of kiss the earth and are fit to be dragged back at a tractor.Certainly, farm implements can be a kind of movable devices that oneself drives.

Burner

Present employed burner is the burner of big Bunsen (this life) type, and wherein boil-off gas mixes with air, is combusted into the quite hot flame between 900 ℃ to 1200 ℃.To testing at the equipment shown in our previous application, no matter how the burner tip that extends along the horizontal plane with respect to ground to be processed changes, the temperature of flame can be scattered rapidly.The heat and not processed for want of for fear of all ground it is necessary to make all burners quite closely placed side by side.

Also surprisingly find, according to the present invention, for the burner of a certain size, can the burner tip in hybrid chamber on or insert a wire netting near it or mesh members can be handled the broad area on ground.

Wire netting or silk screen have the effect of improving the diffusion of air mixture by the speed that reduces the mixture in the chamber, and heat is delivered near the large tracts of land of burner faster.

Can make wire netting or silk screen be formed with the concave surface of a complete extend through combustor cavity easily.

For best result, the size of mesh preferably is no more than 2 millimeters.

Have been found that a kind of like this burner structure that combines with a kind of traction shield (Trailing shroud) or guard shield will make the high-temperature combustion gas below the guard shield evenly propagate, find that also the weeds and the insect in crops such as the relevant clover of control is effective especially.

Silk screen is that the trade mark bought from the market is that the temperature-resistant material of INCANOL is made.

Have been found that with a kind of and draw a kind of like this burner structure that shield or guard shield combine the high-temperature combustion gas below the guard shield will evenly be propagated, find that also control weeds and the insect relevant with the crops ploughing and weeding are effective especially.But also have been found that at least in some occasion, adopt wire netting or silk screen to insert member and damaged with speed or using the some flame intensity of the flame that produces in the burner tip place represented of the impact of face over the ground.Like this, at least in some cases, can always not accumulate in processed ground fully from the calory burning of burner.

An object of the present invention is by in agricultural flame cultivator, providing a kind of burner arrangement uniform, that flame temperature is assembled that above-mentioned obvious defects is dropped to minimum.

According to a further aspect of the invention, agricultural flame cultivator is improved, be included near the burner structure of the Bunsen burner type that a wire netting or silk screen insert are arranged at burner tip or it in the hybrid chamber, burner is arranged to flame is guided to the zone of processing, improvement also comprises provides a Bunsen burner, be arranged to additional heat is guided to identical processing region, thereby make improved heat accumulation and remain on the ground in the processing region.

According to the present invention, a kind of improved flame cultivator as in the previous paragraph also is provided, wherein said wire netting or silk screen insert are made indent, and be positioned at or be close proximity to traction shield or a guard shield, wherein additional Bunsen burner be positioned on the described plug-in type Bunsen burner or with it near so that improve near the plug-in type Bunsen burner flame speed.

The Bunsen burner that additional heat is provided is normal structure preferably, and it does not comprise a wire netting or silk screen insert.Like this, except the additional heat that provides at processing region, make the speed of flame emission and assemble all than with one have wire netting or silk screen insert that burner provided was eager to excel in whatever one does.Additional heat also provides the long time of staying to the control of weeds and insect under the situation in multiple crops.

Farm implements

According to application target, farm implements can adopt various ways.In traditional intertillage (row cropping), farm implements are used to control weeds, for example heat-resisting cotton or corn or similar crops and the preceding crops of emerging.Farm implements can comprise and are applicable to the burner apparatus that moves between the crops embarking on journey; has the protector that cooperates with burner; heat being guided on the ground weeds around the plant base portion, and the protective plant leaf exempts from the damage that thermal radiation or hot air flow cause.

In another kind of structure, farm implements adopt a metal shell or a guard shield that is pulled in the gas spout back.Farm implements are applicable on the place of pruning recently such as clover or similar crops or pasture and carry out; wherein the gas of igniting is not directed on the ground below metal shell; and in the igniting of the back edge of shell, thereby the base portion burning weeds of crops cane with kill off the insect pests.

For alfalfa, can grow up again for cutting crops in the future, the crops should not be subjected to the influence of inexcessive heat, no longer handles in the new developmental process in crops.

Under special circumstances, farm implements can be sizable tractor-drawn devices, are applicable under ploughing and weeding and handle large tracts of land.Perhaps, farm implements can be quite little, have to be applicable to manual single or group's burner.

Also have, adopt the burner combination of the wire netting that is connected in the additional combustion device or silk screen insert to be used for being subjected to spatial constraints or manual operations is carried out in inaccessiable zone in common mechanical.

Describe the present invention in detail below in conjunction with appended accompanying drawing, wherein:

Fig. 1 is the general arrangement that a tractor-drawn flame cultivator of an evaporator of the present invention is housed.

Fig. 2 and 3 shows the member of evaporator, and wherein Fig. 2 is input pipe and the measurement mechanism at the vaporizable liquid of inside, and Fig. 3 is the assembly and the evaporation cavity of the type.

Fig. 4 is back and forth in the schematic diagram of fuel channel, gas regulation control valve and the burner arrangement of all evaporators.

Fig. 5 one is equipped with the evaporator schematic diagram of burner.

Fig. 6 is a schematic side view, and it shows another farm implements that are used for flame cultivator.

Fig. 7 one is equipped with the schematic diagram of the another kind of form of evaporator of burner.

Fig. 8 is the front elevational schematic of Fig. 1 farm implements, and it shows some sets of burners.

Fig. 9 is the schematic side view that wherein has another evaporator of adjustable measurement valve.

Figure 10 schematically shows the typical flame cultivator of the evaporator that uses an array burner and an improved.

Figure 11 is the end-view of the burner outlet of an improved.

Figure 12 is the end view of flame cultivator farm implements.

Figure 13 one has the end view of flame cultivator farm implements of the burner arrangement of improved.

Figure 14 is the plane with the Bunsen burner of the same type shown in Fig. 4.

Figure 15 is the end view of the flame cultivator farm implements of an improved.

Figure 16 is the part end view of Figure 15 farm implements.

Figure 17 is the sectional view of the burner structure of an improved.

Figure 18 is the front view of the burner structure of Figure 17.

Evaporator

Consult Fig. 1,2,3,5 and 7, there is shown the architectural feature and the selectable structure of burner that applies heat to evaporator of evaporator.

Fig. 2 shows to be directly connected to and is used for liquefied petroleum gas (LPG), the input pipe of the charging-tank of the mixture of propane or propane/butane preferably.

The boiling point of propane is-42 ℃, therefore at ambient temperature, it must 40 with 120psi pound/square inch between pressure under store concrete pressure apparent temperature and deciding.

The boiling temperature of butane is higher, so the mixture of propane/butane has a higher boiling point temperature than pure propane, therefore will produce lower pressure.

Fuel is delivered to the evaporator 10 from holding vessel under pressure, and is discharged in the chamber by a spout 14 that is remained on input pipe 11 ends by accessory 13 separably.Input pipe 11 is connected to the flexible pipe that causes holding vessel by accessory 11a.

When with flame heat chamber 12, in chamber 12, the liquid that discharges from input pipe 11 evaporates under hot environment, by gas accessory 15 usefulness pipes gas is sent then.

The expansion that fuel produced that enters chamber will absorb a large amount of heats, and heat is by evaporator burner 16 among Fig. 5 or 17 supplies of the burner among Fig. 7.

The spout 14 of metering has predetermined size, and to supply enough liquid fuels, when working on the particular loop of 6 burners shown in Figure 8 of as many as, these liquid fuels will satisfy the demand of this group burner.

Gas is delivered to an arm (manifold line), delivers to burner by pressure-regulating valve 20 or 21 then.

Valve 20 can be a kind of low capacity flow regulator, and valve 21 can be a kind of big volume flow adjuster, the quantity of the burner when specifically looking the farm implements real work.

Each burner can comprise that a control arrives the choke valve of the gas flow of each burner.

These choke valves are set also can be used to control the gas flow that burner is respectively organized in arrival.

Consult Fig. 9, the figure shows an improved evaporator, in this evaporator, a needle valve assembly 29 is arranged on the input of liquid fuel input pipe 11.Needle valve assembly comprises a needle-valve 25, valve seat head (socket head) 26 and needle-valve is locked in the lock nut 28 of a desired location.

This valve of turn makes needle point move with respect to valve seat 11c, and control input liquid 11a flows to the flow of pipe 11 thus.One lid 27 can be set, cover socket head 26.

Consult Figure 10, schematically show the typical flame cultivator that uses four groups of burners 70 among the figure, each group has four burners 71.Supply LPG fuel by jar 60 to burner with choke valve 61,62 controls, these choke valves 61,62 are suitable for fuel are discharged into evaporator tube 63, and this pipe preferably has the elongated aperture pipe of a measured hole (not shown) at its each end.Use and allow meticulousr adjusting to flow to the fuel flow rate of burner for fear of the poor efficiency of fuel, the fuel capacity of all burner dissipated requires fuel to evaporate before being assigned to burner.

The control of fuel flow rate is basically two stages, phase I comprises the igniting of ignition burner (pilotburner) 64, to preheat evaporator and fuel wherein, be second stage then, promptly light the burner of the predetermined quantity in all burners or other group.Evaporator 63 absorbs enough heat whole fuel that all burners are required and is converted into gas, so that regulate by regulator valve 66.

The gas flow that flows to sets of burners 70 from adjuster is by choke valve 65 controls.Because the capacity of evaporator pipe 63 is quite big,,, make the possibility of jamming minimum that occurs in the measuring tube thus preferably greater than 1 millimeter so the size of the measured hole (fixable or adjustable) of the fuel of measurement arrival pipe is also quite big.

An individual burner that is entering the steam temperature control before the adjuster that is subjected in the efferent duct of evaporator chamber realizes evaporation.Avoid adjuster to be subjected to making the heat of the costliness of adjuster premature failure like this.

Control from the flow of the liquid of fuel tank outflow with a magnetic valve.

Because the liquid of inflow evaporator is by the aperture 11 (c) of a correct sizing, 14 controls, so also be subjected to the influence of the pressure between evaporator output tube 15 and the adjuster, this pressure approximately is fluid pressure and the pressure reduction between the downstream pressure between adjuster and burner in jar.But this pressure is how much changing according to employed steam.If use to surpass the ability of aperture, promptly allow enough liquid by arriving the ability of evaporator, and heat also will act on the evaporator chamber, temperature will rise so.Temp control switch will cut off the fuel that arrives evaporator burner 63 then, thus cooling evaporator and steam supply amount.

The combination of orifice size, pressure and temperature control can be guaranteed effective running of safety and equipment.

Farm implements

Consult Fig. 1, there is shown the farm implements of a general tractor-drawn, it can be installed on the coupling arrangement of tractor of the servicing unit with a guide wheel 40, and can center on two connecting rod leverages 41, and this linkage supports the farm implements of kiss the earths by connecting rod 42.Burner 17 is positioned at around the deflecting plates (deflector plate) 43, with directly heating below the deflecting plates of ground, guarantees from installing toward the heat at upper reaches minimum.All kiss the earth devices 43 are bearing on the main beam 44, and these devices comprise pivotal point 45, as shown in Figure 8, the array device of kiss the earth farm implements are pivoted backward on himself, to reduce farm implements shared width in road uses.

Consult Fig. 6, it shows the farm implements of the improved of an employing one burner apparatus 50, and burner apparatus 50 laterally is installed on the farm implements at 51 places.Burner apparatus 50 is placed all spouts 52 at interval, unlit gas is introduced in the chamber that is formed between farm implements and the ground, returns along general about 1 meter dark shell 53 then.

Structure will make unlit gas light at the back edge 53a place of metal shell 53.

Shell has the effect that is stabilized in the admixture of gas below the shell and makes it rest on the place that gas has best effects of lighting on ground.

Farm implements can be bearing on the three connecting rod leverages of a common farmland tractor by backbar 54, and the farm implements of kiss the earth are bearing on all chains 55 simultaneously.

Fig. 5 shows the evaporator of an improvement form, and in evaporator, evaporation cavity 10 is just in time relatively installed with the burner nozzle 24 that is installed in the burner shell 16.

Have been found that it is best to add thermal effect with the structure of this burner and the evaporator in burner housing, make the thermal effect that adds in the evaporation cavity reach best.

Consult Figure 11,12,17 and 18 in the accompanying drawing below and describe the another kind of practical structure of burner and relevant farm implements.

Burner

Burner 71 preferably forms with heat-resisting thin tubular metal plate easily, and the one end is pressed into an oval-shaped opening 78, and installing one in this opening 78 also is the wire netting or the mesh members 77 of heat proof material.One or more gas spouts 72 are installed in the burner body 71, one air intake is arranged on the back of burner, and covered by similar web material 74, it can effectively prevent the air-flow of gas flame and " to after-combustion " (the burning back) that takes place subsequently and prevent outside material enter combustor cavity.

Burner outlet 78 is coated with the wire netting of preferably being made by Incanol (brand mark) or similar heat proof material.The surface of wire netting preferably is pressed into inwardly, forms in the face of one of the burner tip upper surface crooked inwardly recess.Find surprisingly that this method provides a kind of controlled burner flame, make each burner high temperature area on every side reach maximum, the shortcoming of the known previous burner structure of applicant is minimized.

With comprising one, all burners are mounted to and can essentially horizontally radiate downwards towards the farm implements 73 of the deflection component 80 of ground deflecting facet flame and heat.

One or more apertures 81 can be set in deflection component, make, allow heat partly to spill into absorber 63 regardless of cooperating.

Farm implements cooperate with the slide plate 79 or the similar device of kiss the earth.All slide plates is according to the requirement in concrete crops and spaced apart.

Consult Figure 13,14 and 15, burner 17 has a flaring exit shell 100, so that flame is guided to quite wide zone with quite high speed.

Burner 17 preferably is bearing on the top of the shroud member 73 on the cultivator shown in Figure 13.Burner 17 is equipped with the burner tip that passes the aperture in the guard shield 73, be used for flame emission to as be installed in the similar processing region that the burner that comprises a wire netting insert 77 71 under the guard shield is handled.Except the additional burner 17 that is installed on the shroud member 73, the structure of cultivator is similar to the shown in Figure 6 of this paper.It being understood that the requirement of the concrete condition that the quantity of burner 17 can control according to the gas temperatures that concentrate on below the shroud member 73 and change such as the other factors of the situation around what and the crops material of the serviceability that comprises crops to be processed, moisture.

Burner 17 produces a kind of flame of high temperature, and when unite with the wire netting burner a kind of high-speed flame that plays the combustion-supporting effect of generation, also produce in a kind of processing region that is diffused in below the shroud member on the quite wide area than thermal-flame.It being understood that shroud member is an optional characteristic.It helps heat concentrated on the ground downwards and this heat is maintained in alfalfa/pasture harvesting in the most effective area.What it is also understood that is that burner structure can change as required, but has been found that burner should be the structure of opening wide, and does not have wire netting or silk screen insert.

The structure of cultivator main body can according to it whether be used to handle such as the crops of embarking on journey of cotton or corn and for example alfalfa or similarly the crops, pasture change.

Consult Figure 15 and 16, shown in the figure once improved farm implements, it has a burner 71 and a combustion-supporting burner 17, burner 71 comprise one as the aforementioned the outlet on wire netting member 77, combustion-supporting burner 17 is adjacent with burner 71 in farm implements support 100, farm implements support 100 comprises air deflection thin slice 101 as shown in the figure, so that hot air flow is guided to ground down.Figure 16 shows the farm implements with the member 103 that weakens crosswind.

Claims (10)

1. gas burner structures that is used for flame, control weeds and insect equipment, it comprises a burner of the Bunsen burner type with a main body, main body comprises that one is used for the inlet and a burner outlet of gaseous fuel and air, this burner is arranged to flame is drawn outlet, wherein burner comprises that one installs within it wire netting or the silk screen insertion member that also horizontal expansion covers burner outlet, and burner is arranged to heat is guided to the zone of processing.

2. the gas burner shown in claim 1 is characterized in that, be positioned near the described burner of operating position and another combustion-supporting burner be installed on it, with the speed that improves flame and with flame spread to handling the zone.

3. evaporator that is used for such as liquid petroleum gas (LPG) fuel of propane or propane/butane mix, this fuel is applicable to flame, control weeds and insect equipment, wherein evaporator comprises: the heater assembly that a chamber and is associated, be used to hold fuel, and be fit to be heated the apparatus heating with the fuel in the evaporation chamber; Restriction flows to the measurement mechanism of flow of the liquid fuel in this chamber, this measurement mechanism be positioned at chamber or with its next-door neighbour, make the fuel quantity between measurement mechanism and the heater assembly minimum.

4. the evaporator shown in claim 2 is characterized in that, measurement mechanism comprises adjusting device, with the flow of the liquid of adjusting to measurement mechanism.

5. evaporator that is used for such as the LPG fuel of propane or propane/butane mix, the boiling point of fuel is less than 0 ℃, the chamber and one that this evaporator comprises gas burner heater, a receiving fluids LPG is in chamber or near the measurement mechanism of chamber, be restricted to the flow of chamber when being used for heating fuel, realized that thus fuel flashes to gaseous state controlledly, can carry out conventional pressure regulation gaseous fuel.

6. as the described farm implements that an evaporator is housed of claim 3 to 5, it is characterized in that farm implements comprise all gas burners, these burners are supplied with the gas from described evaporator.

7. as the described farm implements that an evaporator is housed of claim 1 to 3, it is characterized in that farm implements are equipped with the gas spout of guiding ground into, and comprise and be suitable for before fire fuel gaseous fuel is diffused into ground air deflection means.

8. evaporator that is used for such as the LPG fuel of propane or propane/butane gas, it comprises an elongate tubular member and the heater assembly that is associated, with the liquid fuel in the evaporation tube-like piece, described tube-like piece comprises that one allows fuel to flow to the measurement mechanism of tube-like piece, and measurement mechanism has a bigger hole or a plurality of hole.

9. evaporator as claimed in claim 8 is characterized in that, each end of tube-like piece comprises the outlet of one boil-off gas being arranged a hole at the mid portion of tube-like piece.

10. burner as claimed in claim 1 or 2 is characterized in that, the adjacent installation of wire netting or mesh members and burner outlet, and make inner recess towards burner outlet.

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