JPS61261680A - Reciprocating pump - Google Patents

Abstract

PURPOSE:To enhance a follow-up property in a valve unit and promote a pump to obtain its high speed, by constituting the pump so as to forcedly open and close the valve unit in accordance with reciprocating motion of a plunger through friction force generated between a resisting material, provided in the periphery of the valve unit, and the internal surface of a cylinder. CONSTITUTION:A piston rod 24 is reciprocated in the axial direction by rotation of a crankshaft, and a pump, fitting a plunger 27 to be inserted to a stepped part 25 in a point end of the piston rod 24 and housed in a cylinder 21, separates inside the cylinder 21 and a manifold 20 into a base end chamber 28 and a point end chamber 29. The pump, forming plural through holes 31, communicating with the both chambers 28, 29, in the plunger 27, seatably mounts a valve unit 33 of a doughnut plate-shaped suction valve 40 to the end part of the through hole 31 in a side of the point end chamber 29 serving as a valve seat 32. And the pump, securing a resisting material 39, consisting of a circular arc-shaped sectional elastic material of rubber or the like, along to the periphery of said valve unit 33, longitudinally moves the valve unit 33 in accordance with reciprocating motion of the plunger 27 by friction force between the resisting material 39 and an internal surface of the cylinder 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reciprocating pump having a piston means equipped with a suction valve.

[Prior Art] In a conventional reciprocating pump of this type, for example, as shown in FIG. A V-backing 5 is interposed between the cylinder 4 and the manifold 3, and a plunger 6, which is a pump means, is slidably movable in a reciprocating manner through the backing 5. The inside is divided into a distal end chamber 7 and a proximal end chamber 8. The plunger 6 includes a piston support 9 and a crank 1 that are slid on the crankcase 2.
The plunger 6 is connected to the crankshaft 1 through the cylinder 4, and has a through hole 12 formed in the plunger 6 that communicates the tip chamber 7 and the base chamber 8 of the cylinder 4. A valve seat 13 is formed at the end thereof, and the valve body 1 is seated on the valve seat 13 while being pressed by a spring 14 which is a pressing means.
A suction valve 16 is formed in which a valve 5 is disposed.

Further, a discharge valve 17 is formed in the distal end chamber 7 of the cylinder 4, and an inlet port 18 communicating with the through hole 12 is formed in the proximal end chamber 8 of the cylinder 4.

[Problems to be Solved by the Invention] Since the conventional reciprocating pump is as described above, the valve body 15 of the suction valve 16 formed at the tip of the plunger is pressed against the valve seat 13 under a constant load by the spring 14. Since the plunger 6 is pressed in the direction in which it is seated, there is a problem in that the ability to follow the plunger 6 is poor when the plunger 6 reciprocates, and the applicable range of the rotational speed of the pump is narrowed.

[Means for Solving the Problems] This invention has been made in view of the above-mentioned circumstances, and its outline is that a resistor is provided on the outer periphery of the valve body and is capable of slidingly contacting the inner periphery of the cylinder. The valve body is mounted so that it can move forward and backward into the valve seat due to the frictional force between the cylinder and the resistor as the piston means reciprocates, thereby improving the ability to follow the piston means in a high rotation range. The object of the present invention is to provide a reciprocating pump that can be improved and operated at higher rotation speeds.

[Example 1] An example of the present invention will be described below based on the attached drawings.

FIG. 1 is a schematic sectional view showing a reciprocating pump of the present invention.
In the drawings, reference numeral 20 denotes a manifold attached to the tip of a crankcase on which a crankshaft (not shown) is supported, and a cylinder 21 is attached to the tip of the manifold 20.

Further, the manifold 20 is formed with a suction hole 22 that communicates with the inside of the cylinder 21 .

The cylinder 21 is slidably installed in the manifold 20 via a gasket 23 in a water-tight manner.

The tip of the piston rod 24, whose base end is connected to a crankshaft supported by the crankcase, can be inserted and removed. The piston rod 24 has a six-step portion 25 at its distal end and a six-step portion 25 having a step portion 25 and a male threaded portion 26 at its distal end.

A plunger 27, which is a piston means, is inserted, and the plunger 27 separates the inside of the cylinder 21 and manifold 20 into a base end chamber 28 and a tip end chamber 29, and inside the cylinder 21,
It is slidably installed through a V-packet 30 interposed between the base end of the cylinder 21 and the manifold 20 so that it can reciprocate. A plurality of through holes 31 are bored in the plunger 27 in a circular manner to communicate the proximal end chamber 28 and the distal end chamber 29 of the cylinder 21 .

At the end facing the tip chamber 29 of the plurality of through holes 31,
A valve seat 32 is formed respectively. A donut plate-shaped valve element 33 is disposed on these valve seats 32 so as to be seatable thereon.

Further, at the tip of the piston rod 24, there is a stopper 35 having a plurality of protrusions 34 in one circumferential direction.

It is fitted into the plunger 27 with a cylindrical collar 36 in between, and is fixed by a nut 37 screwed to the male threaded portion 26 at the tip of the piston rod 24 . The valve body 33 is movable in the axial direction and is disposed between the plunger 27 and the stopper 35 while forming a passage 38 with the collar 36. Further, along the outer periphery of the valve body 33, as shown in FIG.
Fixed with no gaps or at intervals. A suction valve 40 is formed by the valve seat 32, the valve body 38, and the like. The resistor 39 may have a C-shaped cross section as shown in FIG. 5, or may have a C-shaped cross section as shown in FIG. It is possible to have a C-shaped cross section with a coil spring 42 interposed therein, or a U-shaped cross section with a plate spring 43 having a U-shaped cross section attached inside, as shown in FIG.

A valve seat member 45 in which a valve seat 44 is formed is disposed at the tip of the cylinder 22, and a discharge valve 48 is disposed in which a valve body 47 is seated on the valve seat 44 while being pressed by a spring 46. is formed in the tip chamber 29 of the cylinder 21, and a manifold 4 covering the discharge valve 48 is formed at the tip of the cylinder 21.
9 is fitted. On the other hand, the base end chamber 28 of the cylinder 21 is communicated with the suction hole 22 of the manifold 20.

[Operation of the Invention] Since the reciprocating pump of the present invention is as described above, its operation is as shown in FIG. Due to the friction between the valve body 33 and the cylinder 21, the valve body 33 is brought into contact with the stopper 35, and the fluid in the base end chamber 28 of the cylinder 21 is transferred to the through hole 31.
．． It flows into the tip chamber 29 of the cylinder 21 via the valve seat 32 and the passage 38.

Further, as shown in FIG. 3, when the plunger 27 moves to the right, the friction force of the resistor 39 causes the valve body 33 to be seated on the valve seat 32, and the cylinder 21
The fluid in the tip chamber 29 is discharged from the discharge valve 48. At this time, fluid is sucked into the base end chamber 28 of the cylinder 21 from the suction port 22.

[Effects of the Invention] As described above, the reciprocating pump according to the present invention is configured to forcibly open and close the valve body with the reciprocating movement of the plunger by the frictional force between the resistor and the inner surface of the cylinder. Therefore, the ability to follow the reciprocating movement of the plunger accompanying the rotation of the pump is improved, and the pump can be rotated at a high speed. In addition, by increasing the rotation speed of the pump, the pump can be made smaller, is lightweight, has less pulsation, and is advantageous in terms of cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the essential parts of the reciprocating pump of the present invention, Figs. 2 and 3 are explanatory diagrams of the operation of the same pump, and Figs. 4 to 8 show different embodiments used in the same pump. A sectional view of a valve body of a suction valve, and FIG. 9 is a sectional view of a conventional reciprocating pump. In the drawings, 20 manifold 21 cylinder 22 suction port 24 piston 27 plunger 28 base end chamber 29 tip chamber 31 through hole 32 valve seat 33 valve body 38 passage 39 resistor 40 suction valve 48 discharge valve. Procedural amendment (voluntary) June 19, 1985

Claims (1)

[Claims] A pump means is slidably reciprocated within the cylinder, and the pump means is provided with a hole that communicates with a suction port formed at the base end of the cylinder. A reciprocating pump is provided with a suction valve in which a valve seat is formed which communicates with a discharge valve formed at a distal end portion of the pump, and a valve body can be seated on the valve seat. A resistor is mounted on the outer periphery of the cylinder and is capable of sliding on the inner periphery of the cylinder, and as the piston means reciprocates, frictional force between the cylinder and the resistor causes the valve body to push against the valve seat. A reciprocating pump that can move forward and backward.