JPH0663871U - Reciprocating pump device - Google Patents

Abstract

(57) [Summary] [Purpose] The reciprocating pump device 10a is a low-pressure uniflow type piston pump 12 that discharges turf control liquid or fertilizer liquid.
And a high-pressure double plunger pump 14 for generating high-pressure water that is sprayed to open holes for ventilation and water permeation in the lawn, which is installed in a lawn management work vehicle. An object of the present invention is to provide a reciprocating pump device 10a having a structure advantageous for mounting on a vehicle. [Structure] The low pressure type uniflow type piston pump 12 and the high pressure type dual plunger pump 14 share a crankshaft 18a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reciprocating pump device equipped with a low-pressure reciprocating pump and a high-pressure reciprocating pump, which is mounted on a lawn management work vehicle or the like, and more specifically, a reciprocating pump device having a structure advantageous for mounting on a work vehicle or the like. It is about.

[0002]

[Prior art]

 In the management of grass such as golf courses, high-pressure water is sprayed from the nozzle toward the grass, and holes for ventilation and water permeation are formed in the ground below the grass (for example, in Japanese Utility Model Publication No. 54-61036). It is necessary to spray a control solution and a fertilizer solution onto the grass, and it is efficient and costly to use a common work vehicle. In addition, it is advantageous. Abrasion resistance and chemical resistance are not required to inject high-pressure water to create holes for ventilation and water permeation, but about 100 to 500 kgf / cm ^ 2 (cm ^ 2 is "square cm"). A high pressure pump that produces a high pressure. In addition, spraying of the control liquid and fertilizer liquid can be done with a low-pressure pump that generates pressure of 20 to 50 kgf / cm ^ 2 (for the control liquid) or 3 to 5 kgf / cm ^ 2 (for the fertilizer liquid). Since the liquid is chemical and contains fine particles, the pump is required to have wear resistance and chemical resistance.

As described above, it is difficult for a lawn management work vehicle to use a common pump for a plurality of purposes. Conventionally, a high-pressure pump and a low-pressure pump which are separate bodies are provided, so It is mounted on a vehicle and connected to a power transmission member individually so that it can be driven by rotational power from a drive source. In addition, the pumps of the conventional multiple pump that inject high-pressure water are not in phase but are shifted in equal phases, so that pulsation of the common discharge port can be suppressed.

[0004]

[Problems to be solved by the device]

 It is disadvantageous in terms of manufacturing and mounting that the high-pressure pump and the low-pressure pump are separately manufactured, individually mounted on the work vehicle, and the transmission members are individually connected.

Further, when the discharge port of the high-pressure water pump is directly connected to the nozzle without interposing an accumulator or an intermittent valve in the middle and the high-pressure water is jetted from the nozzle, it is advantageous to use the water hammer action. However, in the conventional multiple pumps for high-pressure water, the water hammer action is weak.

An object of the invention of claim 1 is to rationalize the mounting on a work vehicle or the like in a reciprocating pump device equipped with a low-pressure pump and a high-pressure pump, aiming at downsizing and simplification. An object of the invention of claim 2 is to provide a reciprocating pump device capable of strengthening the water hammer action when a multiple pump is adopted as the high pressure pump. A further object of the present invention is to provide a reciprocating pump device which is advantageous for cooling a seal member for sealing a pump chamber against sliding of a plunger in a high pressure reciprocating pump.

[0007]

[Means for Solving the Problems]

 The invention will be described using the reference numerals of the drawings corresponding to the embodiments. In the reciprocating pump device (10a-c) of claim 1, the low-pressure reciprocating pump (12) and the high-pressure reciprocating pump (14) for ejecting different kinds of liquid have the same crankshaft (18a-c).

In the reciprocating pump device (10b, c) according to the second aspect, the high pressure reciprocating pump (14) is a high pressure type multiple reciprocating pump (14). The pumps of the high pressure type multiple reciprocating pump (14) are operated in the same phase with the discharge port (70) being common.

In the reciprocating pump device (10a-c) of claim 3, the low-pressure reciprocating pump (12) and the high-pressure reciprocating pump (14) are a uniflow type piston pump (12) and a plunger pump (14), respectively. The inlet (50) of the uniflow type piston pump (12) is near the seal member (76, 78) for sealing the pump chamber (66) against the sliding of the plunger (58) in the plunger pump (14). ing.

[0010]

[Action]

 In the reciprocating pump device (10a-c) according to claim 1, the low-pressure reciprocating pump (12) and the high-pressure reciprocating pump (14) are driven by the rotation of a common crankshaft (18a-c), and separate liquid bodies are provided. Is discharged at low pressure and high pressure.

In the reciprocating pump device (10b, c) according to claim 2, each pump of the high-pressure type multiple reciprocating pump (14) sucks and discharges in the same phase, and simultaneously discharges the high-pressure liquid to the discharge port (70). To do. As a result, the pressure pulsation at the discharge port (70) increases, and a large water hammer action occurs on the downstream side.

In the reciprocating pump device (10a-c) of claim 3, new liquid is constantly supplied to the suction port (50) of the uniflow type piston pump (12) as the uniflow type piston pump (12) operates. After passing through, the intake port (50) is maintained at a low temperature. On the other hand, in the plunger pump (14), the seal members (76, 78) retain the seal of the pump chamber (66) against the sliding of the plunger (58) and prevent the sliding of the plunger (58). Generate heat. The seal members (76, 78) are cooled by the liquid in the suction port (50) of the uniflow type piston pump (12).

[0013]

【Example】

 The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 is a horizontal sectional view of the reciprocating pump device 10a. The reciprocating pump device 10a is equipped with a low pressure type uniflow type piston pump 12 and a high pressure type dual plunger pump 14, and is mounted on a work vehicle for turf management. The low-pressure uniflow type piston pump 12 pumps the control liquid or fertilizer liquid sprayed from the nozzle to the lawn, and the high-pressure double plunger pump 14 is sprayed from the nozzle to open holes for ventilation and water permeation in the lawn. Generate high pressure water. The low-pressure uniflow piston pump 12 and the high-pressure dual plunger pump 14 share the crankcase 16 and the crankshaft 18a, and the crankshaft 18a extends horizontally and is rotatable at both ends via ball bearings 20. It is pivotally supported by the crankcase 16. The oil seal 22 is fitted on the crankshaft 18a outside the ball bearings 20 in the axial direction of the crankshaft 18a, and prevents oil from leaking from the crankcase 16. The lid 24 is abutted against the side surface of the crankcase 16 so as to close the penetrating portion of the crankshaft 18a in the crankcase 16, and is fixed by a bolt 26. The pump case 28 is applied to the tip side of the crankcase 16 and fixed to the crankcase 16 by a plurality of bolts 30.

FIG. 2 is a view taken along the line II-II of FIG. 1 and 2, the piston rod 32 extends in a horizontal direction at a right angle to the crankshaft 18a, and is slidably fitted to a guide 34 of the crankcase 16 at a base end portion thereof so as to be guided in the axial direction. To be done. The connecting rod 36 is connected at both ends to the crankshaft 18a and the piston rod 32, and reciprocates the piston rod 32 as the crankshaft 18a rotates. The oil seal 38 is located at the end of the guide 34 on the pump case 28 side, is in sliding contact with the piston rod 32 on the inner peripheral side, and prevents the lubricating oil in the crankcase 16 from leaking out. The valve body 40 and the stopper 42 with a through hole are fixed to the tip end portion of the piston rod 32 with a predetermined distance in the axial direction of the piston rod 32 and arranged at the base end side and the tip end side, respectively. The valve seat 44 is loosely fitted into the piston rod 32 so as to be displaceable between the valve body 40 and the stopper 42 having a through hole in the axial direction, and the valve body 40 and the valve seat 44 constitute an intake valve. The piston packing 46 is fitted on the outer peripheral side of the valve seat 44 and slidably contacts the inside of the bore of the pump case 28 on the outer peripheral side. The seal packing 48 is in sliding contact with the piston rod 32 on the base end side of the valve body 40. The suction port 50 and the discharge port 52 are provided on the side portion of the pump case 28 on the low pressure uniflow type piston pump 12 side, and the suction port 50 communicates between the valve body 40 and the seal packing 48. The pump chamber 54 is formed on the front end side of the piston rod 32, and the discharge valve 56 is disposed on the front end side of the pump chamber 54 to allow a one-way liquid flow from the pump chamber 54 to the discharge port 52. The plug 57 is screwed into a hole of the pump case 28 in which the discharge valve 56 is inserted into the pump case 28, and prevents the discharge valve 56 from coming off the pump case 28.

The operation of the low-pressure uniflow type piston pump 12 will be described. As the crankshaft 18 a rotates, the piston rod 32 reciprocates in the axial direction to increase or decrease the volume of the pump chamber 54. In the intake stroke, the piston rod 32 is displaced toward the crankshaft 18a, the volume of the pump chamber 54 is increased, and the valve seat 44 contacts the stopper 42 with a through hole to separate from the valve body 40 and discharge valve. 56 is closed. As a result, the liquid in the suction port 50 is introduced into the pump chamber 54 between the valve body 40 and the valve seat 44 and through the through hole of the stopper 42 with the through hole. On the other hand, in the discharge stroke, the piston rod 32 is displaced toward the discharge valve 56, the volume of the pump chamber 54 decreases, the valve seat 44 contacts the valve body 40, and the discharge valve 56 is open. . As a result, the liquid in the pump chamber 54 is sent to the discharge port 52 via the discharge valve 56.

FIG. 3 is a view taken along the line III-III of FIG. 1 and 3, the plunger 58 extends in the horizontal direction at a right angle to the crankshaft 18a, is fitted in the guide 60 of the crankcase 16 at the base end portion, and is guided in the axial direction. The connecting rod 62 is connected at both ends to the crankshaft 18a and the plunger 58, and reciprocates the plunger 58 as the crankshaft 18a rotates. The oil seal 64 is located at the end of the guide 60 on the pump case 28 side, is in sliding contact with the plunger 58 on the inner peripheral side, and prevents the lubricating oil in the crankcase 16 from leaking out. The pump chamber 66 is formed on the tip side of the plunger 58, and its volume is increased or decreased as the plunger 58 reciprocates. The suction port 68 and the discharge port 70 are provided in the lower part and the upper part of the crankcase 16 in common with each pump of the high pressure type dual plunger pump 14. The suction valve 72 allows a one-way liquid flow from the suction port 68 to the pump chamber 66, and the discharge valve 74 allows a one-way liquid flow from the pump chamber 66 to the discharge port 70. The plugs 73 and 75 are screwed into the holes of the crankcase 16 incorporating the intake valve 72 and the discharge valve 74, respectively, and prevent the intake valve 72 and the discharge valve 74 from coming off. The V packing 76 and the seal packing 78 are arranged in order from the side closer to the pump chamber 66, and are in sliding contact with the plunger 58 on the inner peripheral side, and cooperate with each other to seal the pump chamber 66 against the sliding contact of the plunger 58. Do. The discharge port 70 is directly connected to the high-pressure water injection nozzle without interposing an accumulator and an intermittent valve on the way.

The operation of the high-pressure dual plunger pump 14 will be described. As the crankshaft 18a rotates, the plunger 58 reciprocates in the axial direction to increase or decrease the volume of the pump chamber 66. During the suction stroke, the plunger 58 is displaced toward the crankshaft 18a, the volume of the pump chamber 66 is increased, the suction valve 72 and the discharge valve 74 are opened and closed, respectively, and the liquid at the suction port 68 is passed through the suction valve 72. Is introduced into the pump chamber 66. On the other hand, in the discharge stroke, the plunger 58 is displaced toward the pump chamber 66, the volume of the pump chamber 66 is reduced, the suction valve 72 and the discharge valve 74 are closed and opened, respectively, and the liquid in the pump chamber 66 is discharged. It is sent to the discharge port 70 via 74.

In FIG. 1, the mounting angles of the connecting rod 36 and the two connecting rods 62 on the crankshaft 18a are shifted by 120 ° in the rotational direction. The position of the suction port 50 of the low pressure type uniflow type piston pump 12 is close to the positions of the V packing 76 and the seal packing 78 of the high pressure type double plunger pump 14 in the axial direction of the piston rod 32.

The operation of the entire reciprocating pump device 10a will be described. The low pressure type uniflow type piston pump 12 and the high pressure type dual plunger pump 14 are driven by the rotation of the common crankshaft 18a, and the low pressure type uniflow type piston pump 12 supplies the control liquid or fertilizer liquid to the suction port 50, and The high-pressure dual plunger pump 14 discharges water to the discharge port 70, respectively.

During operation of the reciprocating pump device 10 a, the control liquid or fertilizer liquid sucked from the chemical liquid tank constantly flows through the suction port 50 of the low-pressure uniflow type piston pump 12, and the suction port 50 is maintained at a low temperature. Has been done. On the other hand, in the high pressure type dual plunger pump 14, the V packing 76 and the seal packing 78 generate heat due to the sliding contact of the plunger 58 on the inner peripheral side. In the low pressure type uniflow type piston pump 12 side pump of the high pressure type double plunger pump 14, the V packing 76 and the seal packing 78 are cooled by the low temperature control liquid or fertilizer liquid at the suction port 50 of the low pressure type uniflow type piston pump 12. The temperature rise is suppressed.

FIG. 4 is a horizontal sectional view of another reciprocating pump device 10b. Explaining only the differences from the reciprocating pump device 10a of FIG. 1, the crankshaft 18b has a long pin 80, and the connecting rods 36 and 62 are commonly connected to this pin 80 and reciprocate in the same phase. As a result, the two pumps in the high pressure type dual plunger pump 14 perform suction and discharge in the same phase, and discharge the high pressure water to the discharge port 70 at the same time. As a result, the pulsation of the discharge port 70 is increased, and the water hammer action at the time of switching from the suction cycle to the discharge cycle is strengthened. As a result, the momentum of the high-pressure water jet from the high-pressure water nozzle is increased, and a deep hole for ventilation and water permeation can be formed in the ground under the lawn.

FIG. 5 is a skeleton diagram of another reciprocating pump device 10c. The crankshaft 18c has pins 82 and 84 which are offset by 180 ° in the rotational direction. The low pressure uniflow type piston pump 12 and the high pressure type dual plunger pump 14 share the crankshaft 18c with the crankshaft 18c in common. They are arranged on opposite sides of 18c. The connecting rod 36 of the low-pressure uniflow type piston pump 12 and the two connecting rods 62 of the high-pressure double plunger pump 14 are connected to the pins 82 and 84, respectively, and the rotational movement of the crankshaft 18c is controlled by the piston rod 32 and the plunger. Convert to reciprocating motion to 58 and transmit.

[0023]

[Effect of device]

 According to the first aspect of the invention, the low-pressure reciprocating pump and the high-pressure reciprocating pump have the same crankshaft. As a result, the parts of the reciprocating pump device as a whole are made common, and downsizing and simplification are achieved. The reciprocating pump and the high-pressure reciprocating pump are not required to be individually mounted on a work vehicle or the like, or individual power transmission members are connected, and the work of mounting the reciprocating pump device on the work vehicle can be rationalized. .

According to the second aspect of the present invention, each pump of the high-pressure type multiple reciprocating pump as the high-pressure reciprocating pump is operated in the same phase and discharges the liquid to the common discharge port. The pulsation of the discharge port is increased, and the water hammer action can be increased.

According to the invention of claim 3, the seal member for sealing the pump chamber against the sliding contact of the plunger in the plunger pump as the high-pressure reciprocating pump has a low pressure despite the generation of heat due to the sliding contact of the plunger. Since the seal member as a reciprocating pump is cooled by the low temperature liquid at the suction port, the life and durability of the seal member can be improved.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view of a reciprocating pump device.

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a horizontal sectional view of another reciprocating pump device.

FIG. 5 is a skeleton diagram of another reciprocating pump device.

[Explanation of symbols]

10a-c Reciprocating pump device 12 Low pressure type uniflow type piston pump (low pressure reciprocating pump, uniflow type piston pump) 14 High pressure type double plunger pump (high pressure reciprocating pump, high pressure type multiple reciprocating pump, plunger pump) 18a-c Crankshaft 50 Suction port 58 Plunger 66 Pump chamber 70 Discharge port 76 V packing (seal member) 78 Seal packing (seal member)

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[Procedure amendment]

[Submission date] March 19, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (3)

[Scope of utility model registration request] 1. A low pressure reciprocating pump (1) for discharging different kinds of liquids.
A reciprocating pump device characterized in that the crankshaft (18a-c) is common to the 2) and the high pressure reciprocating pump (14). 2. The high-pressure reciprocating pump (14) is a high-pressure multi-reciprocating pump (14), and each pump of the high-pressure multi-reciprocating pump (14) has the same discharge port (70). The reciprocating pump device according to claim 1, wherein the reciprocating pump device is operated in phase. 3. The low pressure reciprocating pump (12) and the high pressure reciprocating pump (14) are respectively uniflow type piston pumps (1).
2) and the plunger pump (14), the suction port (50) of the uniflow type piston pump (12) is for sealing the pump chamber (66) against the sliding of the plunger (58) in the plunger pump (14). The reciprocating pump device according to claim 1 or 2, wherein the reciprocating pump device is in the vicinity of the seal member (76, 78).