JP2000354801A - Powered spraying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool a lubricating oil of a reciprocating plunger type pump with a simple structure. SOLUTION: A plunger case 8 is so supported as to freely slide on the outer circumference of a plunger 7 reciprocating right and left through an eccentric operation means 6 from an output axis 5 of an internal combustion engine and the inside of the case plunger case 8 is so formed as to store a lubricating oil. On the other hand, cylinder blocks 9a, 9b attached to both right and left sides of the plunger case 8 are provided separately with a water suction route 24 communicating with a high pressure part comprising a first check valve 14 and a second check valve 25 to be highly pressurized by right and left movement of the plunger 7 and a high pressure route 26 communicating with the discharge side of the high pressure part. The water suction routes 24, 24 of the pair of the cylinder blocks 9a, 9b are joined to each other by a water suction pipe 31 and on the other hand, the high pressure routes 26, 26 in the cylinder blocks 9a, 9b are joined to each other by a high pressure pipe 32 and the middle part of the water suction pipe 31 and the high pressure pipe 32 is made to communicate with an oil chamber in the plunger case 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a power sprayer, and more particularly, to a structure of a spray pump.

[0002]

2. Description of the Related Art The present applicant has previously filed Japanese Patent Application No. 10-2096.
No. 42 proposed a power sprayer equipped with a reciprocating pump that reciprocates a plunger by a prime mover to discharge a chemical solution at high pressure. That is, this power sprayer is one in which a casing of a reciprocating plunger pump is connected and fixed to a side of a cylinder block of a prime mover, and the casing houses an eccentric cam fitted on an output shaft of the prime mover, A plunger case movably supporting a reciprocally movable plunger connected to the eccentric cam via a ball bearing; a cylinder block connected to both left and right ends of the plunger case; A cylinder head portion connected to an outer surface, each of the cylinder blocks being connected to a water-absorbing passage communicating with a first check valve provided at each of left and right ends of the plunger, and being connected to a discharge side of the first check valve. And a discharge chamber provided with a second check valve communicating with a cylinder head portion provided with a high-pressure passage. A communication pipe communicates between the water suction passages of the left and right cylinder blocks outside (below) the plunger case, and a suction port is provided in the water suction passage of one of the cylinder blocks to absorb water from the chemical liquid tank. Connect to pipe. Further, a communication pipe communicates between the discharge chambers of the left and right cylinder blocks on the outside (upper side) of the plunger case, and a spray hose is communicatively connected to the one discharge chamber and to the one discharge chamber. The communicating discharge pressure regulating valve is attached to the one cylinder block. The spill water (spill water of the chemical solution) is returned to the chemical solution tank via a sewage hose connected to the discharge pressure adjusting valve.

[0003]

However, according to the above configuration, the lubricating oil in the plunger case rises in temperature due to frictional heat between the plunger and the eccentric cam due to the continuation of the spraying operation. A separate device for cooling the lubricating oil is required, resulting in a problem that the device is complicated and expensive.

The present invention has been made to solve this problem, and utilizes a low temperature of a chemical solution, especially a chemical solution on the water absorption side, and has a relatively simple structure to reduce the lubricating oil in the plunger case. It is an object of the present invention to provide a power sprayer capable of easily performing cooling.

[0005]

According to a first aspect of the present invention, there is provided a power atomizer for accommodating an eccentric operation means connected to an output shaft of a motor. A plunger case that supports a reciprocally movable plunger via a cylinder block connected to both ends of the plunger case, wherein the plunger case is configured to be able to store lubricating oil, Each cylinder block is provided with a water suction passage communicating with a high-pressure portion with a check valve for increasing the pressure by moving the plunger, and a high-pressure passage communicating with the discharge side of the high-pressure portion. The passages are connected by a water absorption pipe, and the high pressure passages in the pair of cylinder blocks are connected by a high pressure pipe. It is obtained by adapted to pass through the casing.

[0006] The invention described in claim 2 is the invention according to claim 1.
In the power atomizer described in the above, the water absorption pipe, the high pressure pipe and the plunger are arranged such that their respective axes are parallel,
The power sprayer according to claim 1, wherein a middle part of the water suction pipe and the high pressure pipe is arranged to pass through a plunger case.

According to a third aspect of the present invention, in the power atomizer according to the first or second aspect, the check valve and the high-pressure pipe provided in the high-pressure passage of the two cylinder blocks are coaxial. It is arranged in.

Further, according to a fourth aspect of the present invention, in the power atomizer according to any one of the first to third aspects, the outer circumferences of the water suction pipe and the high pressure pipe, and the plunger case and the cylinder block are each formed on an O-ring. The water suction pipe and the high pressure pipe are prevented from falling off by a C-shaped retaining ring between the plunger case and the cylinder block.

According to a fifth aspect of the present invention, in the power atomizer according to the fourth aspect, the lengths of the supporting portions of the outer periphery of the water suction pipe and the high pressure pipe with respect to the plunger case are set with respect to the plunger case and the cylinder block. It is configured to be longer than the O-ring attachment interval.

[0010]

Next, embodiments of the present invention will be described. FIG. 1 is a schematic front view of a power sprayer,
2 is a side view, FIG. 3 is a sectional front view of the reciprocating plunger pump, FIG. 4 is a central longitudinal sectional view of the reciprocating plunger pump, and FIG. 5 is a transverse sectional view of the plunger portion.

As shown in FIGS. 1 to 4, a power sprayer according to the present invention has a lower end of a block of an internal combustion engine (gasoline engine or diesel engine) 1 as a prime mover made of a base made of a highly rigid glass reinforced plastic or the like. 2 and bolted to at least four mounting holes 2 on the outer periphery of the base 2.
a, mushroom-shaped anti-vibration supports 3 each made of anti-vibration rubber
Is installed. Note that an electric motor or a hydraulic motor may be used as the prime mover.

The reciprocating plunger type pump 4 accommodates an eccentric operating means 6 connected to the output shaft 5 of the internal combustion engine 1, and is capable of reciprocating left and right connected to the eccentric operating means 6. Plunger case 8 for reciprocatingly supporting the cylinders, cylinder blocks 9a and 9b provided at both left and right ends of the plunger case 8, and a cylinder head portion 1 for closing the front ends of the cylinder blocks 9a and 9b.
0a and 10b, and a connecting plate 12 connected to a lid 11 for closing the back surface of the plunger case 8 is connected to the cylinder case 1a of the internal combustion engine 1 by bolts.

A metal bearing 13 for supporting the column-shaped plunger 7 so as to be able to reciprocate right and left is fitted in the left and right side walls of the plunger case 8 at substantially the center of the upper and lower sides thereof. A first check valve 15 that allows a chemical solution to flow only in the left and right side ends of the plunger 7 is arranged in a communication passage 14 formed in the left and right ends of the plunger 7 in the axial direction (FIG. 8), and the communication path 14 is closed by an urging spring 17 disposed between a valve support 16 having a cross-shaped projecting seat portion shown in FIG. 9 and the first check valve 15. .

A rectangular cutout groove 19 is formed in the center of the longitudinal direction of the plunger 7 so as to slidably fit a slide block 18 in the eccentric actuating means 6 described later. 7).

The eccentric actuation means 6 comprises a plunger case 8
Is disposed on the boss 11a of the lid 11 on the back side of
An eccentric portion 21 a at the tip of a cylindrical rotor 21 connected to the output shaft 5 of the internal combustion engine 1 via a key 20 is fitted to the sliding block 18. The rotor 21 is rotatably supported by a boss of the lid 11 through a bearing 22 and is hermetically held by an oil seal 23 at a portion of the lid 11 outside the boss 11a. The lubricating oil contained in the case 8 is configured not to leak out. Accordingly, the eccentric portion 21a is eccentric by the dimension e with respect to the axis (rotation center line) 5a of the output shaft 5, and the rotation of the output shaft 5 causes the sliding block 18 to be eccentric by the eccentric amount e. The sliding block 18 is slidably fitted so that the left and right side surfaces of the sliding block 18 are in surface contact with the notch grooves 19 of the plunger 7. The driving force is transmitted so that unnecessary force such as bending moment does not act on the plunger.

In each of the cylinder blocks 9a and 9b connected to both right and left ends of the plunger case 8, a water suction passage 24 communicating with the communication passage 14 in the plunger 7 and the second check valve 25 are provided. A high-pressure passage 26 communicating with the discharge side (high-pressure side) is formed. A passage 27 for communicating the discharge side of the first check valve 15 and the suction side of the second check valve 25 is provided in the cylinder head portions 10a, 10b covering the ends of the cylinder blocks 9a, 9b. Are formed. Then, the water suction passages 24, 24 in the cylinder blocks 9a, 9b on both the left and right sides.
The water suction pipe 31 that communicates between them and the high pressure pipe 32 that communicates between the two high pressure passages 26 and 26 are arranged such that the middle part thereof passes through the plunger case 8. On the other hand, the one cylinder block (in the embodiment, the cylinder block 9a on the left side in FIG. 3) is provided with a water suction port 30 to which a water suction hose 29 connected to a chemical solution tank 28 is connected to communicate with the water absorption passage 24, A spray hose 35 is connected to a discharge port 33 connected to the high-pressure passage 26 of the block 9a via a manual valve 34, and a chemical solution such as a pesticide is sprayed at a high pressure from a spray nozzle 36 at the tip of the spray hose 35. It is configured so that A discharge pressure regulating valve 37 is provided in the high pressure passage 26 of the one cylinder block 9a so that the discharge port 3
The discharge pressure of the chemical solution from the spray nozzle 36 via 3 is set to a preferable pressure, and the excess chemical solution (spill water) is returned from the spill port 39 to the chemical solution tank 28 via the reflux hose 40. When the switching valve 38 is opened, the high pressure passage 26 bypasses the pressure adjusting section of the discharge pressure adjusting valve 37.
Can be returned from the spill port 39 to the chemical tank 28 (see FIG. 3).

During the operation of spraying the chemical solution, the low-temperature chemical solution which has entered one cylinder block 9a from the chemical solution tank 28 via the water inlet 30 flows through the water absorption pipe 31, the other cylinder block 9b and the high pressure pipe 32. Since the water suction pipe 31 and the high pressure pipe 32 pass through the oil chamber 8b on the center side of the plunger case 8, the lubricating oil in the oil chamber 8b of the plunger case 8 is stirred by the drive of the eccentric operation means 6. As a result, the outer surfaces of the water absorption pipe 31 and the high pressure pipe 32 are wetted and exchanged heat, so that the plunger case 8 is cooled by the low temperature chemical solution.
The lubricating oil inside is efficiently cooled. FIG.
The scale 41 shown in FIG.
This is for measuring the amount of lubricating oil inside.

Oil seals 42 and 43 are provided on the outer side of the plunger case 8 and on the side of the water suction passage 24 of each of the cylinder blocks 9a and 9b to prevent leakage of lubricating oil and chemical liquid due to reciprocal movement of the plunger 7 from side to side. ing.

The mounting state of the water suction pipe 31 and the high pressure pipe 32 is as follows. That is, as shown in FIG. 6, O-rings 45,
Ring grooves 47, 47 are formed so that 46 is arranged at a distance L2 from the position of distance L1 from the side end surface. On the other hand, the thickness L3 of the left and right side walls 8a of the plunger case 8 is set to be larger than (L1 + L2). Thereby, for example, when attaching the water absorption pipe 31, first, O
The water-absorbing pipe 31 without the ring is inserted into the mounting holes 48 of the left and right side walls 8 a of the plunger case 8. In this case, the outer surfaces of the left and right side walls 8a, 8a and the cylinder blocks 9a, 9b facing the outer surfaces.
A chamfered part is formed on the inner surface side of the O-ring so that the O-ring can be easily inserted. It is very difficult to form a chamfer on the oil chamber 8b side when the space of the oil chamber 8b is narrow.

Then, the O-ring 46 is fitted into only one of the ring grooves 47 at the center of the insertion tip side (for example, the left side in FIG. 6), and the water suction pipe 31 is pulled back to the right in FIG. The amount of this retraction is determined by the O-ring 4
6 is prevented from entering the oil chamber 8b, and is pulled back (FIG. 6).
(The right side of FIG. 1) so that one ring groove 47 at the central portion protrudes from the outer surface of the right side wall 8a. In this state, the O-ring 46 is fitted into one of the ring grooves 47 of the central portion that has come out, and then the water suction pipe 31 is pushed to the left in FIG. At the position where the ring groove 47 on the insertion distal end side of the water suction pipe 31 is exposed on the outer surface of the left side wall 8a, the O-rings 45, 45 are fitted into the pair of ring grooves 47, 47 on the distal end side. , 46, a pair of ring grooves 48,
A C-shaped retaining ring 49 is fitted to the cylinder block 48, and the O-rings 45, 45 near the tip end are fitted with the pair of cylinder blocks 9 a, 9 b.
After that, the cylinder blocks 9a and 9b and the plunger case 8 are connected and fixed by bolts (not shown). The high-pressure pipe 32 is mounted in the same manner.

As described above, the pair of O-rings 45 and 46 fitted on the outer periphery of the left and right ends of the water absorption pipe 31 and the high-pressure pipe 32, respectively.
Is set shorter than the thickness of the side wall of the plunger case 8 to be inserted in the axial direction, even if the chamfered portions are formed only outside the mounting holes 48, 48 of the left and right side walls 8a, 8a of the plunger case 8, The O-ring 46 can be mounted from the outside of the left and right side walls 8a, 8a as the water-absorbing pipe 31 and the high-pressure pipe 32 are pushed and pulled, and the O-ring 46 is not damaged or comes off. In addition, a C-shaped retaining ring 49 is detachably fitted in a ring groove 48 on the outer periphery of the water absorption pipe 31 and the high pressure pipe 32, so that the water absorption pipe 31 and the high pressure pipe can be attached and detached when the cylinder blocks 9 a and 9 b are attached to and detached from the plunger case 8. Inconveniences such as carelessly shifting or slipping out in the axial direction of the O-rings 32 are eliminated, and the functions of the O-rings 45 and 46 are not hindered.

The internal combustion engine 1 has a recoil starter 60, an intake section 61, an exhaust muffler 62 and the like.
A bracket 6 is provided above the cylinder case 1a of the internal combustion engine 1.
If the fuel tank 63 made of synthetic resin is attached via the four and 64 and the grip portions 63a are integrally formed on both left and right sides of the fuel tank 63, the weight can be further reduced.

With the above configuration, when the internal combustion engine 1 is driven, the eccentric portion 21a rotates eccentrically via the rotor 21 in accordance with the rotation of the output shaft 5, but is fitted to the eccentric portion 21a. Since the sliding block 18 is slidably fitted in the notch 19 of the plunger 7 restricted only in the lateral movement by the plunger case 8, the plunger 7 reciprocates on both the left and right sides. When one end of the plunger 7 protrudes in the direction of the cylinder head 10a (10b), the first check valve 15 located on the protruding side closes the gap between the plunger 7 and the water absorption passage 24, while the liquid chemical in the passage 27 is closed. Pressure increases,
The second check valve 25 is pushed open to communicate with the high-pressure passage 26. One end of the plunger 7 has a cylinder head 10
a (10b) when the vehicle retreats from the passage 27 on the retreat side.
The pressure of the chemical solution in the inside becomes negative pressure, and the chemical solution in the water suction passage 24 flows into the passage 27 through the communication passage 14 of the plunger 7 by retreating the first check valve 15. By such a repetitive operation, a high-pressure chemical is alternately fed from the left and right ends of the plunger 7 to the high-pressure chambers 26, 26 of the left and right cylinder blocks 9a, 9b. A high-pressure chemical can be discharged from the nozzle 33 to the spray nozzle 36. In that case, the pair of left and right high pressure chambers 26,
26 are connected by a high-pressure pipe 32 and the high-pressure pipe 32
If the second check valves 25, 25 are arranged on the same axis as the axis, the passage through which the high-pressure chemical solution passes becomes the shortest distance, and the flow of the high-pressure chemical solution becomes smooth. And discharge efficiency can be increased.

As shown in FIG. 1, when the water suction port 30 and the discharge port 33 are provided in the same one cylinder block 9a (or 9b), the water is heated by heat exchange with the lubricating oil in the plunger case 8. Since the chemical solution in the water absorption pipe 31 passes through the high pressure pipe 32 again, the cooling efficiency of the lubricating oil in the high pressure pipe 32 is not good.

On the other hand, as shown in FIG. 11, when the water suction port 30 and the discharge port 33 are provided in different cylinder blocks,
The low-temperature chemical solution taken in from the water inlet 30 is supplied to the suction pipe 3
1 and the high-pressure pipe 32 only pass one time only, so that the heat exchange rate between the lubricating oil and the chemical in the plunger case 8 can be improved.

[0026]

As described in detail above, the power sprayer according to the first aspect of the present invention accommodates the eccentric operating means connected to the output shaft of the prime mover, and via the eccentric operating means. The plunger case includes a plunger case that supports a reciprocally movable plunger so as to be able to reciprocate, and a cylinder block that is provided at both ends of the plunger case. Has a water suction passage communicating with a high-pressure portion with a check valve that increases the pressure by the movement of the plunger, and a high-pressure passage communicating with the discharge side of the high-pressure portion. A high-pressure pipe connects the high-pressure passages in the pair of cylinder blocks while passing through the plunger case at least in the middle of the water-absorbing pipe. Are those that you have configured so that.

With this configuration, at least the water-absorbing pipe through which a liquid such as a low-temperature chemical solution passes comes into contact with the lubricating oil that becomes high in the plunger case, so that heat is exchanged on the surface of the water-absorbing pipe and the lubricating oil is exchanged. Cooled efficiently. When the high-pressure pipe is configured to pass through the plunger case, the lubricating oil is cooled in the same manner as described above. Therefore, another configuration for cooling the lubricating oil in the reciprocating plunger type pump of the power sprayer is unnecessary, and the lubricating oil can be cooled while the configuration of the power sprayer is simple. .

The invention described in claim 2 is the same as the invention described in claim 1.
In the power atomizer described in the above, the water absorption pipe, the high pressure pipe and the plunger are arranged such that their respective axes are parallel,
The power sprayer according to claim 1, wherein a middle part of the water suction pipe and the high pressure pipe is arranged to pass through a plunger case.

By arranging the reciprocating plunger and the water-absorbing pipe and the high-pressure pipe in parallel, the water-absorbing pipe and the high-pressure pipe can be lengthened in the direction in which the plunger extends in the plunger case. Therefore, the lubricating oil can be efficiently cooled.

According to a third aspect of the present invention, in the power atomizer according to the first or second aspect, the check valve and the high-pressure pipe provided in the high-pressure passage of the two cylinder blocks are coaxial. It is arranged in.

According to this structure, since the path from the check valve of the high-pressure passage in the pair of cylinder blocks sandwiching the plunger case to the high-pressure pipe is the shortest distance, the flow of the high-pressure liquid such as a chemical can be smoothly performed. That is, the pressure drop is small, and the spray efficiency can be prevented from being reduced too much.

Further, according to a fourth aspect of the present invention, in the power atomizer according to any one of the first to third aspects, the outer circumferences of the water suction pipe and the high pressure pipe, and the plunger case and the cylinder block are each formed on an O-ring. The water suction pipe and the high pressure pipe are prevented from falling off by a C-shaped retaining ring between the plunger case and the cylinder block.

With this configuration, when the cylinder blocks are attached to both ends of the plunger case in which the water suction pipe and the high pressure pipe have been previously inserted, the mounting direction of the cylinder block is the same as the extending direction of the water suction pipe and the high pressure pipe. Even if there is, the water absorption pipe and the high pressure pipe are not accidentally displaced or come off due to the mounting of the C-shaped retaining ring, and the O-ring does not come off from the plunger case or the cylinder block or is damaged, so that the pump is assembled and disassembled. The effect that work becomes easy is produced.

According to a fifth aspect of the present invention, in the power sprayer according to the fourth aspect, the length of the support portion of the outer periphery of the water suction pipe and the high pressure pipe with respect to the plunger case is adjusted with respect to the plunger case and the cylinder block. It is configured to be longer than the O-ring attachment interval.

According to this structure, by devising the order of mounting the O-rings to be fitted to the outer peripheral ends of the water absorption pipe and the high-pressure pipe, the O-ring can be attached to the plunger case without damaging the O-ring. There is an effect that the fitting and the fitting of the O-ring to the location of the cylinder block can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a front view of a power sprayer.

FIG. 2 is a right side view of the power sprayer.

FIG. 3 is a front vertical sectional view of a reciprocating plunger pump.

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is an enlarged sectional view taken on line VV of FIG. 3;

FIG. 6 is a front vertical sectional view showing a state in which a water suction pipe and a hard pipe are attached to a plunger case.

FIG. 7 is a perspective view showing the relationship between the plunger and the eccentric means.

FIG. 8 is an enlarged sectional view of a location of a first check valve.

9A is a side sectional view of a valve support for the first check valve, and FIG. 9B is a front view.

10A is a side sectional view of a first check valve, and FIG. 10B is a front view.

FIG. 11 is a front view of another embodiment of the reciprocating plunger pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 4 Reciprocating plunger type pump 5 Output shaft 6 Eccentric actuating means 7 Plunger 8 Plunger case 8a, 8a Left and right side walls 8b Oil chamber 9a, 9b Cylinder block 10a, 10b Cylinder head part 14 Communication path 15 First check Valve 21a Eccentric part 24 Water absorption passage 25 Second check valve 26 High pressure passage 27 Passage 28 Chemical tank 30 Water absorption port 31 Water absorption pipe 32 High pressure pipe 33 Discharge port 37 Discharge pressure regulating valve 39 Spill port

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuyasu Osumi 1-32 Chaya-cho, Kita-ku, Osaka-Yanmar Agricultural Machinery Co., Ltd. (72) Inventor Makoto Inoue 1-32 Chaya-machi, Kita-ku, Osaka-Yanmar Agricultural Machinery Stock Company F-term (reference) 4F033 RA14

Claims (5)

[Claims] 1. A plunger case which houses an eccentric operating means connected to an output shaft of a prime mover, and which supports a reciprocally movable plunger via the eccentric operating means, and both ends of the plunger case. The plunger case is configured to be able to store lubricating oil, and each of the cylinder blocks communicates with a high-pressure section with a check valve that increases the pressure by moving the plunger. A high-pressure passage communicating with the discharge side of the high-pressure section, and a high-pressure pipe connecting between the high-pressure passages in the pair of cylinder blocks; And a power sprayer configured to pass through at least a middle part of the water absorption pipe through the plunger case. 2. The water-absorbing pipe, the high-pressure pipe, and the plunger are arranged so that their respective axes are parallel to each other, and an intermediate portion of the water-absorbing pipe and the high-pressure pipe is arranged to pass through a plunger case. The power sprayer according to claim 1, characterized in that: 3. The power sprayer according to claim 1, wherein a check valve and a high-pressure pipe provided in a high-pressure passage in each of the two cylinder blocks are arranged coaxially. 4. The outer circumference of the water absorption pipe and the high pressure pipe, the plunger case and the cylinder block are sealed with O-rings respectively, and a C-shaped retaining ring is provided between the plunger case and the cylinder block. The power sprayer according to any one of claims 1 to 3, wherein the high-pressure pipe is retained. 5. The apparatus according to claim 1, wherein a length of a supporting portion of the outer circumference of the water suction pipe and the high pressure pipe with respect to the plunger case is longer than a mounting interval of the O-ring with respect to the plunger case and the cylinder block. Item 5. A power sprayer according to Item 4.