JP2852715B2 - Reciprocating pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating pump used for injecting a high-pressure liquid in a liquid injector or the like, and more particularly to a reciprocating pump capable of pumping a liquid to a plurality of nozzles with a large pulsating pressure. is there.

[0002]

2. Description of the Related Art A conventional reciprocating pump has only one discharge valve for one pump chamber. Therefore, in a conventional injection device equipped with such a reciprocating pump and injecting high-pressure liquid from a plurality of nozzles to perform deburring, spraying a chemical solution, and injecting a chemical solution into the soil, the conventional injection device has a downstream side. Is connected to an inlet of a nozzle pipe or the like, and liquid is ejected from each nozzle of the nozzle pipe.

[0003]

In the conventional reciprocating pump, when a common reciprocating pump pumps liquid to a plurality of nozzles, it is necessary to interpose a distributor such as a nozzle pipe, and the structure including piping is complicated. become. Also, the difference in the passage length between the inlet of the distributor and each nozzle increases, and the difference in pipe resistance between the nozzles with a short passage length and the nozzles with a long passage length increases, resulting in a difference in the injection amount from each nozzle. Will happen.

On the other hand, when a plurality of discharge ports are provided for a discharge valve while using a common discharge valve, and each discharge port is individually connected to a nozzle via a pipe line, each nozzle is connected to each nozzle. However, the pulsation of the fluid pressure at each discharge port is not large enough, and this is disadvantageous when transmitting the pulsation to the nozzle and using the pulsation to increase the strength of the liquid ejection from the nozzle. Becomes

An object of the present invention is to provide a reciprocating pump capable of pumping liquid to a plurality of nozzles with a large pulsating pressure, simplifying the piping structure on the discharge side, and achieving uniform injection pressure of each nozzle. To provide. Another object of the present invention is to provide a reciprocating pump which can smoothly cope with a change in the number of nozzles.

[0006]

The present invention will be described with reference to the drawings corresponding to the embodiments. The reciprocating pump (10) of the first aspect has the following components (a) to (c). (A) The pump chamber (4) moves back and forth toward the pump chamber (42).
2) Reciprocating member (20) for increasing or decreasing the volume (b) A plurality of discharge valves (54) formed individually from this pump chamber (42) (c) Individual communication with these discharge valves (54) Discharge port (52)

[0007] In the reciprocating pump (10) of the second aspect, the sealing member (48) is detachably mounted on the distal end side of the cylinder member (30) defining the pump chamber (42) on the inner peripheral side. The front end side of the chamber (42) is closed. Discharge valve (5
4) is incorporated in the sealing member (48), and the discharge port (5)
2) is provided on the outer surface side of the sealing member (48).

[0008]

In the reciprocating pump (10) of the first aspect, the reciprocating member (20) reciprocates toward and away from the pump chamber (42), thereby increasing or decreasing the volume of the pump chamber (42). In the discharge stroke in which the reciprocating member (20) moves toward the distal end, the discharge valve (54) is opened, and the pump chamber (4) is opened.
The liquid in 2) passes through each discharge port (5) through each discharge valve (54).
Discharged to 2). The discharge of the liquid from the pump chamber (42) to each discharge port (52) is stopped during the suction stroke, and is performed only during the discharge stroke.
The hydraulic pressure in 2) pulsates. Further, since the liquid from the pump chamber (42) is guided to the respective discharge ports (52) via the individual discharge valves (54), the pulsation of the liquid pressure at each of the discharge ports (52) is performed from the common discharge valve. It increases compared to the case where the liquid is discharged to each discharge port (52).

In the reciprocating pump (10) according to the second aspect, when the number of nozzles for pumping liquid from the common pump chamber (42) is changed, the sealing member (48) is removed from the cylinder member (30). Another sealing member (48) provided with the same number of nozzles (52) as the number of nozzles later is newly mounted on the distal end side of the cylinder member (30).

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a vertical sectional view of a triple plunger pump device 10. The triple plunger pump device 10 includes three plunger pumps 26 operated in the same phase using a common drive unit such as the crankcase 12. FIG. 1 shows only one plunger pump 26 of the triple plunger pump device 10, but the other plunger pumps 26 have the same structure. The cover 14 is used for the crankcase 12.
And is detachably fixed to the crankcase 12 by a plurality of screws 16. The crankshaft 18 extends in the horizontal direction, and is rotatably supported at both ends by the crankcase 12, and has one pin 19 common to the three plunger pumps 26. The plunger 20 is fitted in the guide 22 of the crankcase 12 at the base end, and is guided by the guide 22 in a horizontal direction perpendicular to the axial direction of the crankshaft 18. The connecting rod 24 has pin portions 19 of the crankshaft 18 at both ends.
And rotatably coupled to the plunger 20 and the crankshaft 1
The plunger 20 is reciprocated with the rotation of the plunger 8. The pin portion 19 extends in common with each plunger 20 of the three plunger pumps 26 of the triple plunger pump device 10, whereby each plunger 20 reciprocates in the same phase. The oil seal 28 is provided at the distal end of the guide 22 and slides on the plunger 20 on the inner peripheral side to prevent the lubricating oil in the crankcase 12 from leaking through the guide 22.

The manifold 30 includes the plunger pump 2
Six bores 32 are provided corresponding to the number 6, and are applied to the tip side of the crankcase 12, and are joined to the crankcase 12 by a plurality of bolts 34. Plunger 20
Is extended into the bore 32, and a pump chamber 42 is formed in the bore 32 at the distal end side of the plunger 20. The suction port member 36 is screwed to a lower portion of the manifold 30, and defines a suction port 38 inside. The suction valve 40 is prevented from coming off by the suction port member 36, is incorporated in the manifold 30, and allows a one-way liquid flow from the suction port 38 to the pump chamber 42. The V-packing 44 and the seal packing 46 are arranged in an arrangement relationship on the distal end side and the proximal end side with respect to the axial direction of the plunger 20, respectively. The chamber 42 seal is maintained.

FIG. 2 is a view of the sealing member 48 of FIG. 1 as viewed from the front end side. 1 and 2, the sealing member 48 is
It is provided for each plunger pump 26, abuts against the distal end surface of the manifold 30, and is detachably fixed to the manifold 30 by a plurality of bolts 49. The two discharge port members 50 are connected to the sealing member 48 from the outer surface side of the sealing member 48.
And a discharge port 52 is defined inside. Each discharge valve 54 is incorporated in the closing member 48, and is prevented from falling off by the discharge port member 50, and is connected to the discharge port 5 from the pump chamber 42.
2 allows one-way liquid flow. A discharge hose (not shown) is connected to each discharge port 52, and the liquid from each discharge port 52 is sent to one nozzle (not shown) on the tip side of each discharge hose.

FIG. 3 is a view of the sealing member 48 to which the three discharge port members 50 are assembled when viewed from the front end side. In order to cope with a change in the number of nozzles connected to each plunger pump 26, various figures are shown. The sealing member 48 to which the number of discharge port members 50 are assembled is prepared in advance.

The operation of the embodiment will be described. The rotational power of a drive source (not shown) such as an engine is transmitted to the crankshaft 18 via a belt or the like, and the crankshaft 18 rotates. The plungers 20 of the plunger pumps 26 of the triple plunger pump device 10 reciprocate in the same phase by the rotation of the crankshaft 18 to increase or decrease the volume of the pump chamber 42. In the suction stroke in which the plunger 20 moves in the proximal direction, the volume of the pump chamber 42 increases, and the suction valves 40 and 3
The individual discharge valves 54 are opened and closed, respectively. As a result, a liquid such as a drug solution is sucked into the pump chamber 42 via the suction valve 40.

In the discharge stroke in which the plunger 20 moves in the distal direction, the volume of the pump chamber 42 decreases and the suction valve 40
And the three discharge valves 54 are closed and open, respectively. Thus, the liquid in the pump chamber 42 is discharged to each discharge port 52 through each discharge valve 54. The liquid pressure at each discharge port 52 pulsates because the liquid is pushed out from the pump chamber 42 during the discharge stroke of the plunger 20. Further, since each discharge port 52 receives the liquid from the pump chamber 42 through each discharge valve 54, the pulsation of the hydraulic pressure at each discharge port 52 is
This increases as compared with the case where each discharge port 52 receives the liquid in the pump chamber 42 via one common discharge valve 54. As a result, the pulsation of the fluid pressure at each nozzle also increases, and the ejection strength of the liquid ejected at each nozzle in synchronization with the ejection cycle of the triple plunger pump device 10 increases.

When the number of nozzles for pumping liquid from the common pump chamber 42 is changed from two to another number, for example, three, the bolt 49 is loosened and the discharge port member 50 shown in FIG. 3. The sealing member 48 of FIG. 3 provided with the same number of discharge ports 52 as the number of nozzles after the change is applied to the distal end side of the manifold 30 and the bolts 4 are removed.
Tighten again with 9. This makes it possible to smoothly deal with the change in the number of nozzles.

In the embodiment, the plunger pump 26 constitutes the triple plunger pump device 10. However, the present invention is applied to a case where the plunger pump 26 is used alone without forming a multiple pump, It is also applicable to other reciprocating pumps such as a piston pump other than a pump.

[0018]

According to the first aspect of the present invention, a plurality of discharge ports are provided for a common pump chamber, and each discharge port individually discharges liquid from the pump chamber via a discharge valve. Therefore, the pulsation of the liquid pressure at each discharge port increases, and the pulsation can be used to increase the ejection intensity of the liquid from the nozzle. Further, when the liquid is pumped from the common pump chamber to the plurality of nozzles, each nozzle can be connected to the discharge port through an individual pipe line, and a distributor and the like in the middle are omitted, and the piping and structure are reduced. Is simplified, the difference in the flow path length to each nozzle is reduced, and the injection amount from each nozzle can be equalized.

In the second aspect of the present invention, the sealing member having the discharge port and the discharge valve is detachably attached to the tip end of the cylinder member, and the sealing member can be replaced as appropriate according to the number of nozzles. The change of the entire reciprocating pump can be avoided, and the change in the number of nozzles can be smoothly dealt with.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a triple plunger pump device.

FIG. 2 is a view of the sealing member of FIG. 1 as viewed from a distal end side.

FIG. 3 is a diagram illustrating a sealing member to which three discharge port members are assembled, as viewed from a distal end side.

[Explanation of symbols]

 Reference Signs List 20 plunger (reciprocating member) 26 plunger pump (reciprocating pump) 30 manifold (cylinder member) 42 pump chamber 48 sealing member 52 discharge port 54 discharge valve

Claims (2)

(57) [Claims] 1. A advance and retreat toward the pump chamber (42) reciprocating member to increase or decrease the volume of the <br/> pump chamber (42) (20)
And formed individually from the pump chamber (42).
A plurality of discharge valves (54) and these discharge valves (54)
A reciprocating pump characterized in that individual discharge ports (52) communicating with each other are formed . 2. A sealing member (48) is provided in the pump chamber (4).
2) is removably mounted on the distal end side of a cylinder member (30) defining the inner peripheral side to seal the distal end side of the pump chamber (42), and the discharge valve (54) is connected to the sealing member (4).
8. The reciprocating pump according to claim 1, wherein the discharge port is provided on an outer surface side of the sealing member.