JP2001003854A - Pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly actuate a plunger of a reciprocating plunger type pump. SOLUTION: The outer periphery of a plunger 7, reciprocating in the lateral direction from an output shaft of an internal combustion engine through an eccentric actuating means, is slidably supported by a plunger case 8, and a lubricant is stored in the plunger case 8. At a longitudinal center part of the plunger 7, a sliding recess portion 19 having a pair of sliding surfaces 19a, 19b orthogonal and opposite to laterally reciprocating motion of the plunger 7 is formed by cutting off. As an eccentric actuating means, the rotating rotor 21 fitting over the output shaft 5 is pivotally supported to a boss portion of a cover element 11 of the plunger case 8 through a bearing 22, and a square- shaped sliding guide element 18 rotatably fitting over an eccentric portion 21a of a tip part of the rotating rotor 21 is slidably fitted in the sliding recess portion 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating plunger type pump in a power atomizer or the like.

[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 plunger type pump in which a plunger reciprocates 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 outer ring of the ball bearing in which the inner ring is fixed to the eccentric cam is closely contacted with the eccentric cam so as to be fixed to the recess formed in the center of the plunger. Since the fitting was performed, the eccentric cam was scraped due to a dimensional error in the processing of the eccentric cam or the recess or an assembly error such that the axis of the plunger was slightly inclined from a direction perpendicular to the eccentric cam shaft. A thrust reaction force intersecting the axis of the plunger acts on the rotational motion, and a large frictional resistance is generated when the plunger reciprocates in the axial direction, and when the plunger is severe, the axis of the plunger is curved. There is a problem that such plastic deformation appears.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned technical problems, and has a simple structure, which does not generate unnecessary reaction force on a reciprocating plunger and ensures lubrication. It is an object of the present invention to provide a pump capable of performing the above-described operations.

[0005]

According to a first aspect of the present invention, there is provided a pump according to the first aspect, wherein water is absorbed by a plunger which can reciprocate via eccentric operating means connected to an output shaft of a motor. A reciprocating plunger type pump configured to discharge the liquid at a high pressure, wherein the eccentric operation means comprises: a rotary rotor having an eccentric portion eccentric with respect to the axis of the output shaft; And a sliding guide body which is fitted to the portion and slidably fits in a sliding recess formed by cutting out the plunger.

[0006] The invention described in claim 2 is the invention according to claim 1.
The sliding contact surface of the sliding recess with respect to the sliding guide body is a pair of opposing surfaces orthogonal to the reciprocating direction of the plunger.

According to a third aspect of the present invention, in the pump according to the first or second aspect, the sliding guide body is a non-rotating angular block or a rotating rotor. The rotating body is relatively rotatable and slides on the sliding contact surface of the sliding recess.

According to a fourth aspect of the present invention, in the pump according to any one of the first to third aspects, the rotating rotor is rotatably supported on a casing of the pump via a bearing. It is.

The invention described in claim 5 is the same as the claim 4.
Wherein the casing or the bearing is provided with a passage for lubricating oil.

[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 casing of the reciprocating plunger type pump 4 houses the 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. A plunger case 8 for supporting the plunger 7 so as to be able to reciprocate, cylinder blocks 9a and 9b connected to both left and right ends of the plunger case 8, and a cylinder head portion for closing a tip end of each of the cylinder blocks 9a and 9b. A connecting plate 12 composed of 10 a and 10 b and connected to a lid 11 that closes the back of the plunger case 8 is bolted to the cylinder case 1 a of the internal combustion engine 1.

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. .
Note that the valve support 16 is supported by a C-shaped retaining ring that is fitted to the inner diameters of the left and right side ends of the plunger 7.

A rectangular (square) sliding block 18 as a sliding guide in the eccentric actuating means 6, which will be described in detail later, is slidably fitted to the longitudinal center of the plunger 7. A sliding recess 19 having a shape is formed with a notch (see FIG. 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 rotary 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. In addition, this rotating rotor 21
Is rotatably supported by a boss of the lid 11 via a bearing 22 and has a boss 11 a of the lid 11.
The oil seal 23 keeps the airtight airtight at the outward position, so that the lubricating oil contained in the plunger case 8 does not 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 1 to rotate.
8 rotates eccentrically by the amount of eccentricity e, but the sliding contact surfaces 18a, 18a on both left and right sides (a pair) of the sliding block 18 are in the direction perpendicular to the axis of the plunger 7, that is, the reciprocating direction of the plunger 7. The pair of sliding contact surfaces 18 are formed.
a and 18a are slidably fitted so as to make surface contact with a pair of left and right sliding contact surfaces 19a and 19a in the sliding recess 19 of the plunger 7 (see FIGS. 5 and 7). The driving force is transmitted so that only the eccentric amount e moves left and right, and unnecessary force such as bending moment does not act on the plunger 7.

Further, a pair of sliding contact surfaces 19 of the sliding recess 19 are provided.
a, 19a and the sliding contact surfaces 1 on the left and right sides of the sliding block 18
8a and 18a have flat contact surfaces with each other, so that the surface pressure when the plunger 7 is operated is small, and wear can be reduced.
For this reason, the material selection range of the sliding block 18 as the sliding contact guide body is expanded, and various metal materials can be selected and used.

Each of the cylinder blocks 9a and 9b provided on both left and right ends of the plunger case 8 is provided with a water suction passage 24 communicating with the communication passage 14 in the plunger 7, and a second check valve 25. 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 that has entered one cylinder block 9a from the chemical solution tank 28 through 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 liquid chemical due to the reciprocal movement of the plunger 7 from side to side. ing.

The mounting state of the water absorption 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 the O-ring 4 on the insertion tip side.
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 on the O-ring 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 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 rotary rotor 21 in accordance with the rotation of the output shaft 5, but is fitted to the eccentric portion 21a. The sliding block 18 is slidably fitted in the sliding recess 19 of the plunger 7 restricted only in the lateral movement by the plunger case 8, so that the plunger 7 reciprocates lightly on both the left and right sides without receiving bending force. You can move.
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. , 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 10a (10
When retreating from b), the pressure of the chemical in the retreat-side passage 27 becomes negative pressure, and the chemical in the water suction passage 24 retreats the first check valve 15 through the communication passage 14 of the plunger 7 to the passage 27. Inflow. 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. 3
3 can discharge a high-pressure chemical solution to the spray nozzle 36. In this case, the passage between the pair of left and right high pressure chambers 26, 26 is connected by a high pressure pipe 32 and the second check valves 25, 25 are arranged coaxially with the axis of the high pressure pipe 32. Since the flow path is the shortest distance and the flow of the high-pressure chemical is smooth, the pulsation of the high-pressure pipe 32 due to the high-pressure chemical can be reduced, and the discharge efficiency can be increased.

As described above, a pair of opposing sliding surfaces 19a, 1 orthogonal to the reciprocating movement of the plunger 7 are provided.
A sliding block fitted to the eccentric portion 21a of the rotary rotor 21 may be formed in a cylindrical shape with respect to the rectangular sliding recess 19 having the 9a (not shown). In this case, since the cylindrical sliding block is rotatably fitted to the eccentric portion 21a, the outer peripheral surface of the cylindrical sliding block and the pair of sliding contact surfaces 19a, 19a are provided. May be configured to make sliding contact with each other while relatively rotating.

Further, as shown in FIGS. 11 and 12,
A roll bearing-shaped rotating body 70 may be used as the sliding guide body fitted on the eccentric part 21a. That is, the rotating body 70 includes an inner diameter boss portion 71 fitted and fixed to the eccentric portion 21a, disk-shaped support plates 72, 72 fixed to both sides of the inner diameter boss portion 71 by welding or the like. Both support plates 72, 7
When the eccentric portion 21a of the rotary rotor 21 rotates eccentrically as the output shaft 5 rotates, each roller 74 The outer peripheral surface of the plunger 7 is in sliding contact with a pair of sliding surfaces 19a, 19a of the sliding recess 19 in the plunger 7.

Even with this configuration, when the eccentric portion 21a rotates eccentrically, sliding friction acts between the outer peripheral surface of each roller 74 and the sliding surfaces 19a, 19a in the sliding recess 19. Therefore, the thrust force and the bending force in the direction intersecting with the reciprocating movement direction of the plunger 7 do not work, and the plunger 7
Can be smoothly reciprocated.

Further, as a bearing between the outer periphery of the rotary rotor 21 and the lid 11 of the plunger case 8, a bearing 75 made of sliding metal (see FIG. 13) may be used.
In this case, an oil groove 76 and an oil hole 77 penetrating in the axial direction are formed in the middle of the outer periphery or the inner and outer diameters of the bearing body 75 so that the lubricating oil reaches the outer oil seal 23 to enhance the cooling effect. You may do it. Further, in each of the above embodiments, an oil hole 78 penetrating from the inner diameter to the outer diameter may be formed in the boss portion of the lid body 11 (see FIG. 4) to promote the circulation of the lubricating oil.

[0029]

As described in detail above, the pump according to the first aspect of the present invention is capable of reciprocating a plunger through an eccentric operating means connected to an output shaft of a prime mover. In a reciprocating plunger-type pump configured to discharge at a high pressure, the eccentric operation means includes a rotary rotor having an eccentric portion eccentric with respect to the axis of the output shaft, and a cover provided on the eccentric portion. A sliding guide body which is fitted and slidably fitted in a sliding recess formed by cutting out the plunger.

With this configuration, even if there is a processing error or an installation error of the eccentric operating means or the plunger,
When the eccentric portion rotates eccentrically, the sliding recess and the sliding guide body are in sliding contact with each other only by sliding friction, so that a bending force is applied to the plunger and a thrust force in a direction intersecting the reciprocating movement. Does not occur, the eccentric operating means and the plunger can be operated smoothly.

[0031] The invention described in claim 2 is the same as that in claim 1.
In the pump described in (1), the sliding contact surface of the sliding recess with respect to the sliding guide body is a pair of opposing surfaces orthogonal to the reciprocating movement direction of the plunger. What is necessary is just to form it in a symmetrical shape with respect to the reciprocating movement direction, and it is possible to simplify the shapes of the sliding concave portion and the sliding guide body, and to reduce the manufacturing cost of the pump.

According to a third aspect of the present invention, in the pump according to the first or second aspect, the sliding guide body is a non-rotating angular block or a rotating rotor. By using a rotating body that is relatively rotatable and slides with respect to the sliding contact surface of the sliding recess, the forming of the sliding guide body and the sliding recess can be further simplified. This has the effect of reducing the manufacturing cost of the pump.

According to a fourth aspect of the present invention, in the pump according to any one of the first to third aspects, the rotary rotor is rotatably supported on a casing of the pump via a bearing. Therefore, during the conversion rotation of the eccentric operating means attached to the output shaft of the prime mover, it can be received by the casing of the pump via the bearing of the rotary rotor, and only the driving force in the axial direction can be transmitted to the plunger, This has the effect that the pump can operate smoothly.

The invention described in claim 5 is the same as the invention described in claim 4.
In the pump described in (1), since the casing or the bearing is provided with a passage for lubricating oil, when the casing of the pump is used as an oil chamber for lubricating oil for the plunger and the eccentric operating means, Can be used for lubrication of bearings and the like.

[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 cross-sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is an enlarged sectional view taken along 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 sliding guide body.

12 is a sectional view taken along line XII-XII in FIG.

13A is a perspective view of a first embodiment of a metal bearing body, and FIG. 13B is a perspective view of a second embodiment of the metal bearing body.

[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 18 Sliding guide body 19 Sliding recess 19a, 19a Sliding contact surface 21a Eccentric portion 24 Water absorption passage 25 Second check valve 26 High pressure passage 27 Passage 28 Chemical liquid 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 Company F-term (reference) 3H075 AA09 BB03 BB12 BB15 BB23 CC15 CC19 CC32 CC33 CC35 CC36 DA04 DB03 DB04 DB10 DB29 3J101 AA02 AA42 AA54 AA62 CA08 FA32 FA60 GA29 4F033 RA14 RD01 RD05 RE02 RE08

Claims (5)

[Claims] 1. A reciprocating plunger type pump in which a water-absorbed liquid is discharged at a high pressure by a plunger which can reciprocate via an eccentric operation means connected to an output shaft of a motor. The operating means includes a rotary rotor having an eccentric portion eccentric to the axis of the output shaft, and a sliding rotor fitted on the eccentric portion and slidingly formed in a notch formed in the plunger. A pump comprising a sliding guide body movably fitted. 2. The pump according to claim 1, wherein a sliding surface of the sliding recess with respect to the sliding guide body is a pair of opposing surfaces orthogonal to a reciprocating direction of the plunger. 3. The sliding guide body is a non-rotating angular block body or rotatable relative to the rotating rotor, and is in contact with a sliding contact surface of the sliding recess. The pump according to claim 1, wherein the pump is a rotating body that slides. 4. The pump according to claim 1, wherein the rotating rotor is rotatably supported on a casing of the pump via a bearing. 5. The pump according to claim 4, wherein a passage for lubricating oil is provided in the casing or the bearing.