JP4786840B2 - Backpack power sprayer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for reducing pressure fluctuations of a pump of a shoulder-type power sprayer that discharges and sprays liquid fertilizer and liquid agent in a state of being carried on the back.
[0002]
[Prior art]
In the power sprayer, since the chemical liquid is discharged by the reciprocating motion of the plunger in the pump, the pulsation is inevitably generated, the pressure is changed, and the parts such as the pump and the valve are burdened. Therefore, in a stationary power sprayer, a chamber is provided so that the pulsation is as small as possible, so that the impact due to the pressure fluctuation of the pump is alleviated and the load on the periphery of the pump is reduced.
[0003]
[Problems to be solved by the invention]
However, the power sprayer on the back has to be compact and lightweight in order to carry it on the back, and the chamber made of metal is heavy, so that the space is saved to save space. Therefore, pulsation is inevitably generated, stress is applied to the periphery of the pump, and the pump safety valve is broken.
[0004]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
[0005]
A chemical tank (19), a prime mover (64), and a pump (60) are placed on the machine body frame, and a flexible water discharge hose (16) communicates with the discharge port (28) of the pump (60) and a sprinkler. In the backpack type power sprayer to which the pressure accumulating tube (5) that can be expanded and contracted is connected, the pressure accumulating tube (5) is disposed between the prime mover (64) constituting the backpack power sprayer and the backrest. The discharge port (28) of the cylinder head (65) constituting the pump (60) is disposed between the backpack type power sprayer and the backrest, and a pressure accumulating tube is disposed at the discharge port (28). One end of (5) is connected, and the other end of the accumulator tube (5) is fixed between the prime mover (64) and the back rest of the intermediate bracket (15) fixed to the backpack type power sprayer side. Connected to the joint (24), other than the joint (24) In is obtained by connecting the flexible water discharge hose (16).
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the invention will be described. 1 is an overall rear view of the backpack type power sprayer of the present invention, FIG. 2 is an overall left side view of the backpack type power sprayer of the present invention, FIG. 3 is a plan sectional view of a pump portion, and FIG. It is rear surface sectional drawing of a part.
[0007]
In FIG. 1 and FIG. 2, the overall configuration of the backpack type power sprayer will be described. The machine body frame and the chemical tank 19 are integrally molded by a synthetic resin. A mounting step portion is formed on the rear surface of the chemical liquid tank 19, and a pump 60, an engine 64 serving as a prime mover, and the like are mounted and fixed on the mounting step portion via vibration-proof elastic bodies 17 and 17. Yes. However, it can also be set as the structure driven by a motor instead of an engine. The engine 64 is mounted and fixed on the outer mounting surface of the pump 60 mounted on the chemical liquid tank 19 via the vibration-proof elastic bodies 17 and 17, and the output shaft of the engine 64 protrudes into the pump case. Jar is driving.
[0008]
A starter lever 23 for pulling a pull string for starting the engine protrudes from the engine 64. A wire harness for stopping gasoline fuel from the engine 64 toward the fuel stop lever 18 is extended. In addition to the fuel stop lever 18, the accelerator wire 1 extends toward the adjustment dial 2. By rotating the adjusting dial 2, both the accelerator wire 1 and the discharge pressure adjusting valve can be operated. Further, a fuel tank is disposed below the engine 64, and a fuel filler port 22 for the fuel tank is provided. A tank lid 20 that opens and closes the upper surface of the chemical liquid tank 19 is provided.
[0009]
Next, the overall configuration of the pump 60 will be described with reference to FIGS. As shown in FIG. 4, anti-vibration elastic bodies 17, 17 are provided below, and the anti-vibration elastic bodies 17, 17 are fixed on a mounting portion below the chemical tank 19. An engine 64 is attached to the front side of the pump 60, and an adjustment dial 2 is provided on the left side of the pump 60. As shown in FIG. 4, the suction pipe 6 is connected from the upper chemical solution tank 19 to the suction port 27 provided in the cylinder head 65. Further, as shown in FIG. 3, a discharge port 28 of a cylinder head 65 is provided between the back support of the shoulder type power sprayer on the side opposite to the engine 64, and the discharge port 28 of the present invention to be described later is provided. An accumulator tube 5 is connected.
[0010]
A discharge valve 26 and a suction valve 25 are provided inside the cylinder head 65, and a discharge pressure adjustment valve 4 is additionally provided on the left side of the cylinder head 65. The discharge pressure adjusting valve 4 includes a slide rod 7 that slides to the left and right by the action of a cam by the rotation of the adjustment dial 2, a biasing spring 8 at the tip of the slide rod 7, and a ball valve of the discharge pressure adjusting valve 4. It is configured. The passage of the discharge pressure adjusting valve 4 is opened to the discharge passage of the discharge port 28 of the cylinder head 65. When a discharge pressure exceeding the pressure of the portion is generated, the discharge pressure adjusting valve 4 is pushed open. The overflow circuit 50 is configured to return to the chemical liquid tank 19 again via an overflow pipe (not shown).
[0011]
Further, the lubricating circuit 9 is configured to guide the liquid to the rear of the plunger 3 from the circuit of the discharge port 28, and guides the liquid of the discharge pressure between the plunger seals 30 and 31. . Then, the liquid leaking further rearward from the plunger seal 31 is communicated and guided from the suction pipe 6 to the circuit of the suction port 27 via the recovery circuit 29 shown in FIG. Plunger seals 30 and 31 are fitted inside the plunger case 63, and the plunger 3 is configured to slide inside the plunger case 63. The plunger case 63 is clamped and fixed between the pump case 61 and the cylinder head 65.
[0012]
The pump case 61 and the case lid 62 are combined to form a case. A plunger hole for reciprocating the plunger 3 is opened in the plunger case 63. The pump case 60 is provided with a through hole 44 through which the input shaft 12 passes and a bearing hole 45 that supports the crankshaft 11 on the engine 64 side. A small-diameter gear 56 is fixed to a portion where the input shaft 12 is located inside the pump case 61, and the small-diameter gear 56 meshes with a large-diameter gear 55 on the crankshaft 11 to input the input shaft 12. The large-diameter gear 55 and the crankshaft 11 are driven through the small-diameter gear 56.
[0013]
A plunger rod 13 is pivotally supported on the crankshaft, and the plunger 3 is connected to the left end portion of the plunger rod 13 via a connecting pin 14. Further, the pump case 61 and the case lid 62 are joined to constitute an integral case, and a breather insertion hole 42 is formed in the upper end portion of the pump case 61 constituting the case. In FIG. 3, the breather insertion hole 42 is fitted with a synthetic resin stopper and a lid-use breather 66.
[0014]
Next, the pressure accumulation tube 5 that also serves as the chamber of the present invention will be described. The pressure accumulating tube 5 is interposed between a discharge valve 26 serving as an outlet of the pump 60 and a water discharge hose 16 proximal end connected to a sprinkler serving as an outlet of the sprayer. The valve 4 is in communication. The pressure accumulation tube 5 is made of a synthetic resin such as vinyl chloride or rubber having flexibility, and serves as a chamber as an expandable / contractible tube. In this way, while being lightweight, it can be arranged in a compact manner without selecting an installation location.
[0015]
That is, in this embodiment, as shown in FIG. 3, one end of the pressure accumulating tube 5 is communicated with the discharge port 28 of the pump 60, and the other end of the pressure accumulating tube 5 is fixed to the pump case 61 or the case lid 62. The joint 24 is supported by the intermediate bracket 15. This connection portion is fixed to the stoppers 69 and 69 so that it does not easily come off even when water pressure is applied. Thus, the pressure accumulating tube 5 is fixed to the body frame side. In addition, since the pressure accumulation tube 5 expand | swells, the inflatable space shall be ensured, However, When there is no allowance space, it is also possible to attach so that it may swell out of an apparatus. The other end of the joint 24 is connected to the flexible water discharge hose 16 so that it can be sprayed by being connected to a sprinkler (not shown).
[0016]
In such a configuration, when the pump 64 is driven by operating the engine 64 with the sprinkler cock stopped, the plunger 3 is reciprocated to suck the chemical from the chemical tank 19 and from the water discharge valve 26. Since the water is discharged and the cock is closed, the pressure accumulating tube 5 expands, and when it reaches the set pressure or higher, it is returned to the chemical liquid tank 19 via the discharge pressure adjusting valve 4 and the overflow circuit 50. When the cock is opened and the chemical solution spraying operation is performed, the plunger 3 is reciprocated, and thus pulsation occurs. This pulsation is expanded and contracted in the pressure accumulating tube 5 and absorbed to reach the water discharge hose 16. Thus, the water discharge pressure is almost constant and can be stably supplied from the flexible water discharge hose 16 to the sprinkler.
[0017]
Therefore, in a backpack type power sprayer with limited space, the chamber is not provided and the discharge pressure regulating valve 4 may be damaged due to impact due to vibration due to a change in the discharge pressure. As described above, since the change in the discharge pressure is mitigated by the expansion and contraction of the pressure accumulation tube 5, the vibration is suppressed, the impact applied to the discharge pressure adjustment valve 4 is reduced, and the pressure accumulation tube is not provided newly. 5 also serves as a chamber for relaxing the pressure fluctuation of the discharged water. In addition, in a shoulder-type power sprayer that carries out work on the back, a lightweight synthetic resin tube or rubber tube (or hose) can be said to be suitable in terms of a small increase in weight.
[0018]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0019]
As shown in claim 1, a chemical tank (19), a prime mover (64), and a pump (60) are placed on the machine frame, and communicated with the discharge port (28) of the pump (60) and the spraying basket. In a backpack type power sprayer in which an inflatable / shrinkable accumulator tube (5) is connected between a flexible water discharge hose (16), the accumulator tube (5) is a prime mover (64) constituting the backpack type power sprayer. ) And a backrest, and a discharge port (28) of a cylinder head (65) constituting the pump (60) is disposed between the shoulder-type power sprayer and the backrest. One end of the accumulator tube (5) is connected to the outlet (28), and the other end of the accumulator tube (5) is fixed between the prime mover (64) and the backrest on the side of the shoulder-type power sprayer. Connected to the joint (24) of the intermediate bracket (15) The other end of該継hand (24), since the connecting the flexible water discharge hose (16), in certain knapsack power sprayer with limited space, without taking place, the accumulator tube can be located.
Further, the pressure accumulating tube can obtain the effect of a chamber that reduces the pressure fluctuation of the discharged water.
In addition, in a shoulder-type power sprayer that performs work on the back, a lightweight tube also has the advantage of not increasing the weight.
[Brief description of the drawings]
FIG. 1 is an overall rear view of a backpack type power sprayer according to the present invention.
FIG. 2 is an overall left side view of the shoulder-type power sprayer of the present invention.
FIG. 3 is a plan sectional view of a pump portion.
FIG. 4 is a rear sectional view of a pump portion.
[Explanation of symbols]
4 Discharge Pressure Adjustment Valve 5 Accumulation Tube 11 Crankshaft 16 Water Discharge Hose 19 Chemical Liquid Tank 28 Discharge Port 60 Pump 61 Pump Case 62 Case Cover 63 Plunger Case 64 Engine 65 Cylinder Head 66 Synthetic Resin Cap and Lid Breather

Claims (1)

A chemical tank (19), a prime mover (64), and a pump (60) are placed on the machine body frame, and a flexible water discharge hose (16) communicates with the discharge port (28) of the pump (60) and a sprinkler. In the backpack type power sprayer to which the pressure accumulating tube (5) that can be expanded and contracted is connected, the pressure accumulating tube (5) is disposed between the prime mover (64) constituting the backpack power sprayer and the backrest. The discharge port (28) of the cylinder head (65) constituting the pump (60) is disposed between the backpack type power sprayer and the backrest, and a pressure accumulating tube is disposed at the discharge port (28). One end of (5) is connected, and the other end of the accumulator tube (5) is fixed between the prime mover (64) and the back rest of the intermediate bracket (15) fixed to the backpack type power sprayer side. Connected to the joint (24), other than the joint (24) , The knapsack power sprayer, characterized in that the concatenation of the flexible water discharge hose (16).

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