CH652617A5 - SPRAYER, ESPECIALLY FOR AGRICULTURAL PURPOSES. - Google Patents

Description

The invention relates to a spraying device according to the preamble of claim 1.

Various designs of spraying devices are known, which essentially have a spray agent container supported by a vehicle and a blower arranged outside the container, with which a carrier air stream for the spraying agent is generated, which is supplied to a nozzle ring arranged on the rear end of the container by means of a pump. In the known constructions, the air is sucked in by the blower from behind or from the side and the carrier air flow with the spray medium is released from the device essentially at an angle of 90 ° to the direction of travel. The main disadvantage of this design is that as a result of the air deflection by 90 ° or 180 °, the energy expenditure for generating the carrier air stream is considerable and that, particularly at higher speeds, the depth of penetration of the spray jet into the crops is small; parts of the carrier air stream enriched with spray can also be sucked in again. This leads to an uneven and excessive spray agent content in the carrier air flow which disturbs the predetermined dosage, which can result in damage to the plants. The device also has a relatively large space requirement due to the arrangement of the blower outside the spray agent container.

The invention now aims to provide a compact spraying device which allows the spraying agent jets to penetrate deeply into the room cultures with relatively little energy expenditure and ensures a uniform spraying agent coating.

According to the invention, this object is achieved by the characterizing features of claim 1.

This design creates an extremely compact and space-saving device that ensures a high depth of penetration into the room culture as a result of the spraying agent being dispensed at an acute angle to the blower axis, whereby the cutting penetration of the carrier air flow enriched with spraying agent into the room culture ensures a double-sided spray agent coating on the leaves becomes. In the device according to the invention, the fan can advantageously have a relatively low suction power because there is no sharp deflection of the carrier air flow, which would involve a considerable loss of energy.

In a preferred embodiment of the invention, the guide device for the carrier air flow is formed by an essentially conical body which is preferably arranged on the rear face of the spray medium container and which preferably delimits the air outlet duct with the wall of the blower tunnel. This design enables an exchange of guide bodies to achieve different air outlet angles in a simple manner. The guide body can delimit the air outlet channel with an end section of the tunnel wall or be designed as an annular body and itself form the outlet channel.

In practice, in order to avoid loss of spray, it proves to be advantageous if, according to a further feature of the invention, the annular air outlet channel extends in cross section over approximately a three-quarter circle and the circular quarter essentially facing the ground is closed by an insert.

According to a further development of the invention, the spray medium container has an axial container section forming the fan tunnel and, following this, a further axial section, which forms a receiving space for a fan gear and a pump arrangement which is connected to the fan drive.

The invention is explained in more detail below using exemplary embodiments with reference to the drawings. Show it:

1 is an end view of a device according to the invention,

Fig. 2 shows a section through the device along the line II-II in Fig. 1 and

Fig. 3 is a partial section along the line III-III in Fig. 1, two different versions of Luftleiteinrich-lines are shown.

The device shown has a frame 1 with which it can be attached to a vehicle, e.g. a tractor that can be assembled. A spray agent container 2 is attached to the frame 1 and is made in particular of plastic and is provided with a filling opening 3 on its upper side. The container 2 has a substantially annular axial container section 2 'which delimits a tunnel-like passage opening with a circular cross-section. In this tunnel 4 there is an axial fan 5 with an impeller 5 'which is driven by an associated gear 6 carried by the frame 1.

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From the - in the direction of travel (arrow F in Fig. 2) - rear end of the container 1 protrudes into the blower tunnel 4, an essentially conical air guide body 7, which with a curved, outwardly widening end portion of the tunnel wall 8 has a cross section substantially limited circular air outlet duct 9, the mouth of which extends in the example shown in the circumferential direction over an angle of about 240 °. As shown in FIG. 1 in particular, the lower section of the air outlet duct 9 is provided by an insert 10 or the like arranged between the guide body 7 and the tunnel wall 8. sealed, which prevents the spray from being sprayed against the floor. The air outlet duct 9 could of course also by other inserts, partitions or the like. be divided into several sectors in the circumferential direction. For example, there could only be two lateral opening sections, each of which extends over an angle of e.g. Extend 60 °. Furthermore, adjustable guide plates can be provided to limit and to control the air outlet upwards and downwards.

The air guide body 7 carries a ring of guide blades 5 ″ adjacent to the fan wheel 5 ′, which are arranged at a predetermined angle of attack with respect to the fan axis and serve to even out the carrier air flow in the circumferential direction.

In the mouth area of the air outlet duct 9, a ring of spray nozzles 11 (FIG. 3), which are arranged at a mutual circumferential spacing and which are, for example, hydraulic nozzles and are connected via a line 12 from a pump 13 supported on the frame 1, e.g. a diaphragm pump, which is connected to the spray medium container 2. The drive shaft 13 'of the pump, which also drives the transmission 6 via a belt drive 14, is e.g. about the not shown

652 617

te, dash-dotted drive shaft 13 "of a tractor driven.

The pump 13 as well as the blower gear 6 and its belt drive 14 are covered by an axial spray agent container section 2 ″, which extends in the circumferential direction, as shown in FIG. 1, over a little more than half of a circle and has a cross-section in the form of a ring sector mutual connection of the container sections 2 'and 2 ", a protective grille 15 is provided which shields the blower tunnel 4 against the receiving space for the other units.

3 shows two differently designed air guide bodies 7 ′, 7 ″, which give different outlet angles for the carrier air flow. The spray medium jets emitted by the nozzles 11 in the mouth area of the air outlet duct 9 and the carrier air flow emerge laterally from the device at an acute angle a to the fan axis. The outlet angle a deviates considerably from 90 "and in the example shown is between 30 ° and 75 °. It is essential for the invention that the spray medium jets penetrate the spatial culture in a cutting manner, on the one hand to increase the depth of penetration and on the other hand to ensure a spray medium covering both on the top and on the underside of the leaves and on branches and trunks.

It goes without saying that the invention is not limited to the exemplary embodiments shown, rather they can be modified in various ways within the scope of the general inventive concept. So z. B. the shape of the air baffle can be adapted to the respective flow requirements with differently large outlet angles. Furthermore, the blower can have a different design than that shown.

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3 sheets of drawings

Claims (7)

652 617 1. Sprayer, in particular for agricultural purposes, with a specific spray tank to be supported on a vehicle, from which a ring of nozzles arranged on a front side of the tank is fed with spray agent by means of a pump, and an axial blower that provides a carrier air flow for the spray agent discharged from the nozzles generated, characterized in that the spray medium container (2) forms a tunnel-like receiving space (4) for the axial fan (5) and a guide device (7) is provided for the carrier air flow, which extends into the fan tunnel (4) and has an annular cross section Outlet channel (9) for the carrier air flow in the area of the ring of spray nozzles (11) limited such that the carrier air flow exits the device at an acute angle to the fan axis. 2. Apparatus according to claim 1, characterized in that the guide device for the carrier air flow is formed by a, preferably on the rear end face of the spray medium container (2), essentially conical body (7), which preferably with the wall (8) of the Blower tunnel (4) limits the air outlet duct (9). 2nd PATENT CLAIMS 3. Apparatus according to claim 1 or 2, characterized in that the annular air outlet channel (9) extends in cross section over about a three-quarter circle and the circular quarter facing the ground is closed by an insert (10). 4. Apparatus according to claim 2 or 3, characterized in that the substantially cone-shaped guide body (7) carries the ring of spray nozzles (11). 5. Device according to one of claims 2 to 4, characterized in that on the substantially cone-shaped guide body (7) adjacent to the fan impeller (5 ') a ring of air guide vanes (5 ") is mounted. 6. Apparatus according to one of claims 1 to 5, characterized in that the spray medium container (2) has an axial container section (2 ') forming the blower tunnel (4) and, following this, a further axial section (2 "), which forms a receiving space for a blower transmission (6) and a pump arrangement (13) connected to the latter in a drive connection. 7. Apparatus according to claim 1, characterized in that the acute angle is 30 ° to 75 °.