JPH0742941B2 - Reciprocating pump - Google Patents

Description

TECHNICAL FIELD The present invention relates to a reciprocating pump having a piston means provided with an intake valve.

[Prior Art] In a conventional reciprocating pump of this type, as shown in FIG. 9, for example, a cylinder 4 is attached to a tip end portion of a crankcase 2 on which a crankshaft 1 is axially supported, via a suction side manifold 3. A V packing 5 is interposed between the cylinder 4 and the manifold 3, and a plunger 6 which is a piston means is slidably slidable through the V packing 5.
The plunger 6 separates the inside of the cylinder 4 and the manifold 3 into a distal end chamber 7 and a proximal end chamber 8. The plunger 6 is connected to the crankshaft 1 via a piston rod 9 and a rod 10 slidably mounted on the crankcase 2, and the plunger 6 is provided with a distal end chamber 7 and a proximal end chamber 8 of the cylinder 4. A through hole 12 that communicates is formed. This through hole 12
A valve seat 13 is formed at the end facing the front end chamber 7, and a valve body 15 is seated on the valve seat 13 while being pressed by a spring 14 which is a pressing means. Is formed. A discharge valve 17 is formed in the front end chamber 7 of the cylinder 4, and the through hole is formed in the base end chamber 8 of the cylinder 4.
An inlet port 18 communicating with 12 is formed.

[Problems to be Solved by the Invention] The conventional reciprocating pump is as described above, and the valve body 15 for opening and closing the through hole 12 formed in the plunger 6 is provided with a spring 14 toward the plunger 6. Since it always urges,
The posture when 15 is in contact with the end face of the plunger 6 is stable,
Since the liquid pushes open the valve body 15 against the biasing force of the spring 14,
Energy loss cannot be denied. That is, although the spring 14 is used to stabilize the posture, there is a difficult point such as the occurrence of surging which appears as a phenomenon that pulsation increases.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned circumstances, and a resistor provided on the outer circumference of the valve body at a circumferential direction at an inner circumference of the cylinder. Due to the reciprocating movement of the piston means, which is mounted and has a seal device interposed between the cylinder and the resistor, the valve body causes the valve seat and the discharge valve of the valve body to discharge. The present invention proposes a reciprocating pump that can move forward and backward with a stopper that restricts displacement in the direction.

[Operation] In the reciprocating pump of the present invention having the above-described configuration, the resistor 39 provided at the outer periphery of the valve body 33 at a distance so as to be slidably contactable with the inner peripheral portion of the cylinder 21 is mounted. Since the valve body 33 is provided with a space, the liquid flow between the cylinder 21 and the plunger 27 is easy before and after the contact between the valve body 33 and the plunger 27, and the opening and closing of the valve is facilitated. Is smooth. Further, the sliding contact between the inner circumference of the cylinder 21 and the resistor 39 causes the valve body 23 to move against the end face of the plunger 27.
In addition to being kept in parallel, the flow of the liquid on one side of the valve body to the other side is also ensured by providing a gap, so that the valve is stopped earlier after leaving the plunger, as compared with the case of using a spring.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view showing a reciprocating pump of the present invention. In the figure, reference numeral 20 denotes a manifold mounted at the tip of a crankcase on which a crankshaft (not shown) is supported. A cylinder 21 is attached to the part. Further, the manifold 20 is formed with a suction hole 22 communicating with the inside of the cylinder 21.

Inside the cylinder 21, a manifold 20 is slidably installed in a watertight manner via a packing 23, and a tip end portion of a piston rod 24 is connected to a crank shaft whose base end is pivotally supported by a crank case. Made possible. A step portion 25 and a male screw portion 26 are formed on the tip end side of the piston rod 24. Plunger 27, which is piston means, is provided in step 25.
Is inserted, the plunger 27 separates the inside of the cylinder 21 and the manifold 20 into a proximal chamber 28 and a distal chamber 29, and
A V-packing 30, which is a sealing device interposed between the base end of the cylinder 21 and the manifold 20, is slidably provided therein. Plunger 27 is provided with a plurality of through holes 31 communicating with a proximal end chamber 28 and a distal end chamber 29 of cylinder 21 along a virtual circle.

A valve seat is provided at an end of the plurality of through holes 31 facing the tip chamber 29.
32 are formed respectively. On these valve seats 32, a donut plate-shaped valve element 33 is arranged so that it can be seated. In addition, at the tip of the piston rod 24, a stopper 35 having a plurality of protrusions 34 in the circumferential direction is inserted at a distance from the plunger 27 with a cylindrical collar 36 interposed, It is fixed by a nut 37 which is screwed to a male screw portion 26 at the tip of the piston rod 24. The valve element 33 is movable in the axial direction and forms a passage 38 between itself and the collar 36.
And the stopper 35. Further, along the outer periphery of the valve element 33, as shown in FIG. 4, a resistor 39 having a substantially arcuate shape and made of an elastic material such as rubber is fixed at intervals. A suction valve 40 is formed by the valve seat 32, the valve body 33 and the like. The resistor 39 may have a C-shaped cross section as shown in the fifth illustration, or may have a C-shaped cross section as shown in the sixth illustration, in which a C-shaped leaf spring 41 is attached to the inner surface. As shown in the drawing, a C-shaped section in which a coil spring 42 is interposed, and as shown in FIG. 8, a leaf spring 43 having a U-shaped section and having a U-shaped section inside is attached. It is possible to

A valve seat member 45 having a valve seat 44 formed at the tip of the cylinder 21.
And the valve seat 44 while being pressed by the spring 46.
The discharge valve 48, in which the valve element 47 seated on the
A manifold 49 that is formed in the tip chamber 29 of the cylinder 21 and covers the discharge valve 48 is fitted to the tip of the cylinder 21. On the other hand, the base end chamber 28 of the cylinder 21 communicates with the suction hole 22 of the manifold 20.

As shown in FIG. 2, the operation of the reciprocating pump of the present invention having the above-described structure is caused by friction between the resistor 39 of the valve element 33 and the cylinder 21 when the plunger 27 is moved rightward. , 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 passes through the through hole 31, the valve seat 32 and the passage 38.
Through the end chamber 29 of the cylinder 21.

Further, as shown in FIG. 3, when the plunger 27 is moved leftward, the frictional force of the resistor 39 causes the valve element 33 to be seated on the valve seat 32, and the tip of the cylinder 21. The fluid in the chamber 29 is discharged from the discharge valve 48. At that time, cylinder 21
The fluid is sucked into the base end chamber 28 from the suction port 22. Disc 33
A resistor 39 is fixed to the periphery of the plunger 27 with a space therebetween, so that the outer periphery of the plunger 27 is connected to the cylinder 4, the V packing 5, and the valve body.
No pressure is sealed between 33 and
The smoothness of the operation of 33 can be secured.

[Advantages of the Invention] In the reciprocating pump of the present invention having the above-described configuration, the resistor provided at the outer circumference of the valve body at a distance so as to be slidably contactable with the inner circumference of the cylinder is mounted, and the low antibody has a distance. Since it is placed on the valve body, the liquid can easily flow between the cylinder and the plunger before and after the contact between the valve body and the plunger, the valve can be opened and closed smoothly, and the cylinder can be opened and closed. The slidable contact between the inner circumference and the resistor keeps the valve body parallel to the end face of the plunger, and allows the liquid on one side of the valve body to flow to the other side. As a result, the effect of stopping early after leaving the plunger is obtained compared to the case of using a spring.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a reciprocating pump according to the present invention, FIGS. 2 and 3 are explanatory views of the operation of this pump, and FIGS. 4 to 8 are intakes of different embodiments used for this pump. FIG. 9 is a sectional view of a valve body of the valve, and FIG. 9 is a sectional view of a conventional reciprocating pump. In the figure, 20 ... Manifold 21 ... Cylinder 22 ... Suction port 24 ... Piston rod 27 ... Plunger (piston means) 28 ... Base chamber 29 ... Tip chamber 30 ... Sealing device (V packing) 31 ... through hole 32 ... valve seat 33 ... valve body 38 ... passage 39 ... resistor 40 ... suction valve 48 ... discharge valve.

Claims (1)

[Claims] 1. A piston means is slidably slidably provided in a cylinder, and a hole communicating with an intake port formed at a base end portion of the cylinder is bored in the piston means, and a tip end portion of the hole is formed. Is formed with a valve seat communicating with the discharge valve formed at the tip of the cylinder, and the valve body can be seated on the valve seat and the displacement of the valve body in the discharge valve direction can be prevented. In a reciprocating pump having a suction valve provided with a stopper for limiting, a resistor (39 provided at an outer circumference of the valve body (33) at an inner circumference of the cylinder (21) at circumferential intervals. ) Is attached to the cylinder (21) and the piston (27) with a sealing device (30) interposed between the cylinder (21) and the resistor (39). Due to the frictional force between the valve body (33) and the valve seat (32) and the stopper (35), A reciprocating pump that can move forward and backward.