US1571837A - Cooling system for sprayers - Google Patents

Description

Feb. 2 1926.

J. c. |-|u| COOLING SYSTEM FOR SPRAYERS Filed June 24. 19 2 Sheet s-Sheet 1 3140mm Join 63171!!! J. c. HULL' cooum SYSTEM FOR SPRAYERS 2 Shets-Sheet 2 Filed June 24, 1922 II I SW John dial! Patented Feb. 2, 1926.

JOHN G I-IULL, OF GASPORT, NEW YORK.

COOLING SYSTEM FOR SPRAYERS.

Application filed June 24, 1922'. Serial No. 570,751.

To all whom it may concern:

Be it known that I, JOHN G. How, a cit-izen of the United States, residing at Gasport, in the county of Niagara and State of New York, have invented certain new and useful Improvements in Cooling Systems for Sprayers, of which the following is a Specification.

The invention relates to an improved cooling system for internal combustion engines used for driving pumps of insecticide sprayin machines.

It is nowgenerally the custom in the construction of power spraying machines to cool the engine by utilizing water fed to the jacket from a receptacle or container positioned adjacent the engine. Such structures are fairly satisfactory with small types of Sprayers where a low horse power engine is employed, but with the larger machlnes requirin the use of more powerful engines, this method of cooling does not satisfactorily dissipate the heat. It has been proposed to use radiators in connection with such larger types of sprayers, but radiators render the machines heavy and expensive and occupy vertical spaces which often restrict the travel of the machine because of narrow paths frequently found in orchards.

The present invention contemplates a cooling system for sprayers, whereby the water passing through the engine jackets is cooled by the insecticide solution being drawn to the pump driven bythe engine before the water is again returned to the engine jacket.

In carrying out my invention I preferably enclose for a portion of its length the water discharging pipe from the engine cylinder with the conduit through which the insecticide solution travels on its way to the pump so that heat is extracted from this water by the cooled insecticide solution before entrance again to the engine cylinder. In the use of spra-yers theeir'gine is frequently running when the spray nozzle is closed and no solution is being discharged from the pump, and in order that the water for the types of apparatus, and for the mere purjackets may at all times be properly cooled to prevent an overheatin of the engine, I provide in the pump a re ief valve whereby there is a circulation of the insecticide solution when the spray nozzle is closed and the engine under way to cool the water during such idling of the engine.

My invention can be embodied in many pose of illustration I havedisclosed in the accompanying drawings a single apparatus capable of supporting the invention.

In the drawings, Figure 1 represents a side elevation of the apparatus.

Fig. 2 is a detail view with parts in section; and,

Figs. 3 and 4. aresectional views of the heat interchanger.

Referring now more particularly to the drawings wherein like reference characters indicate corresponding parts, the numeral 1 designates a spraying machine of a well known type, supported by rear wheels 2, and front wheels 3. The sprayer is preferably horse drawn,although a power propelled sprayer may be used. Mounted upon the rear axle of the sprayer is the insecticide receiving tank l, the same being of considerable capacity, and holdin an insecticide solution consisting of a well known insecticide dissolved or suspended in water or any other liquid medium so as to provide a free flowing mixture. The insecticide is contained within the interior 5 of the tank. Disposed in advance of the tank is a pump 6, preferably a double acting one which is not shown in section in the accompanying drawings because the pump per se forms no part of this invention. I The function of the pump, however, is to withdraw the insecticide from the interior 5 of thetank, through the discharge conduit 7, thence through the enlarged manifold 8 and into the pipe 9. From the pump the insecticide solution is thrown as aspray through the hose 10 provided with asp ray nozzle 11 having a suitable controlling valve whereby the nozzle may be opened any desired distance or entirely closed. The pump is driven by the in ternal combustion engine 12 mounted upon the forward part of the spraying machine. This engine may be of any well known type having a geared driving connection with the pump for operating the same during the operation of the sprayer. Manifestly, when the pump is in operation, liquid is con stantly withdrawn from the interior 5 of the tank and if the spray nozzle 11 is open, then this solution is thrown as a spray upon foliage, trees, or the like. The internal combustion engine must be in operation when the pump is in action and should the sprayingmachine be moved from tree to tree, it is not always desirable to out off the engine, and in this event the nozzle '11 would be closed while the engine is slowly running the spraying solution entering the pump (5, being then forced back to the tank through the pressure relief valve 13 in the pump and the return pipe lat leading to the tank l. In other words, whenever desirable the engine can run while the machine is be ing moved from place to place and by merely closing the spray nozzle 11 the insecticide solution is in circulation in the circuit defined by the pipes 7, 9, relief valve 13, and return pipe 14-.

In the use of the larger types of spraying machines, much diliiculty has been expe rienced in properly cooling the pump mo tor. The larger machines utilize a four cylinder motor of a considerable horse powei, and it has heretofore been suggested that a cooling radiator be used. Such a radiator is decidedly objectionable when used on a s n'ayer, first because of its increased e pense and weight, and also because of the space necessarily occupied by a radiator which must be vertically disposed to secure maximum etl'iciency. The use of subn'lergcd pipes or coils in the spray tank is objectionable on account o't their obstructing the accessibility of all. parts of the tank for the removal of sediment and its cleansing. The present invention relates solely to the cooling of the engine of a spraying machine and aims broadly to provide a structure wherein the heat oil the water passing from the engine jackets is extracted by the spraying solution drawn from the tank at to the pump 6. lVith this end in View the engine is provided with a water discharge pipe 19 that leads to the water tank 16 disposed within the solution tank t and either entirely surrounded by the solution. therein or partly surround ed by the solution, depending upon its height. Before entering the tank 16 the water in the line 19 passes into an enlarged chamber 18 which is surrounded by the manifold 8 of the pipe 7 through which manifold the solution from the tank passes. It will be ap n'eciated that the enlarged chamber 18 presents a heat transferring surf: ce against which the solution impinges to absorb heat from the water passing through the chamber 18. After cooling in the tank 16 the cool water is drawn through the line 15 for delivery to the cooling jackets of the engine.

A. very essential embodiment; of this invention resides in the provision of the relief valve 13, which has a communication between the pump on the discharge side thereof and the return pipe 14. hen the spraying nozzle is closed and the engine is running, which frequently happens, when the spraying machine is being moved from tree to tree, the solution drawn from the interior of the tank of course passes through the feed pipe 7, through the manifold 8 cooling the water passing to the engine, utter which the insecticide solution enters the pump, escapes through the relief valve 18 and pipe ll back to the tank -l-. When the engine is idling in this manner the Water is also being cooled so that no overheating oi" the engine will occur. it will also be ap preciated that the equipment for dissipating the heat of the engine is very light in character and occupies no material space in the spraying apparatus. Various types ot pumps and engines may be employed and likewise the container for the spraying solution may be disposed at various positions on the sprayer and the capacity thereof may vary between wide limits.

T he engine is shown as havii'ig a thermo siphon type oi? cooling system, although it will of course be understood that a circulating pump may be used in the coolii'ig system if desirable.

Having thus described my invention, what I claim is:

1. in a spraying apparatus, the combination with a solution tank, a pump in communication therewith, a sprayer connected with the discharge outlet oi said pump, an explosive engine for driving the pump, means tor cooling the engine comprising a water container, a water discharge from the explosive engine jacket to said container, and a feeding pipe from the container to the explosive engine jacket for introducing water thereto, said water discharge pipe intersecting the traveling stream of solution being conveyed to the pump whereby heat of the water passing to the engine jacket is absorbed by said solution.

E2. In a spraying machine, the combination with a solution tank, of a pump for drawing solution from said tank through a feeding conduit, a discharge from said pump, an explosive engine for driving the pump. and means for cooling the engine conmrising a water receptacle, water discharge pipe leading t'rom the explosive engine to said receptacle, a atcr teed. pipe leading from the receptacle to a water jacket of theeu- ,cgine, said water discharge pipe being sur rounded for a portion of its length by the solution teeding conduit leading to the pump whereby the traveling stream of solution entering the pump cools the water passing to the explosive engine jacket.

3. In a spraying machine, the combination with a solution tank, of a pump for drawing solution from said tank through a feeding conduit, an explosive engine for driving the pump, a solution discharge conduit having a nozzle communicating with the pump and means for cooling the engine comprising a water receptacle, a water discharge pipe leading from the ettplosive engine to said receptacle, a water feed pipe leading from the receptacle to a water jacket of the engine, said Water discharge pipe being surrounded for a portion of its length by the solution feeding conduit leading to the pump whereby the traveling stream of the solution entering the pump cools the Water passing to the explosive engine jacket, a discharge nozzle leading from the pump,

va relief valve in said pump, and means for returning the solution from the pump to the solution tank When said nozzle is closed and the engine idling.

4. In a spraying apparatus, the combination with a solution tank, a discharge conduit leading therefrom, a pump connected with said conduit for Withdrawing solution from the tank. an explosive engine for driving said pump, means for cooling said explosive engine, comprising a Water circulating system for introducing and discharging Water to and from the Water jacket, and means in said system for absorbing heat of said Water in the solution prior to the entrance of the Water to the engine jacket, said means comprising a Water pipe leading from a Water receiver tank to the engine, and a manifold in the said conduit surrounding a portion of said pipe.

5. In a spraying machine, the combination with a solution tank adapted to receive a spraying solution, a-pump, and a communication between said pump and said solution tank, an explosive engine for driving the pump, and means for cooling said engine, comprising a Water circulating system, and means-in said system for absorbing heat of said Water in the spraying solution entering the pump prior to the entrance of the Water to an engine cylinder jacket, said means comprising a manifold in the communication between the pump and solution tank through Which a water conduit passes.

JOHN C. HULL.

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