WO2008069254A1

WO2008069254A1 - Moving-seal portion liquid-leakage preventing device for piston pump

Info

Publication number: WO2008069254A1
Application number: PCT/JP2007/073528
Authority: WO
Inventors: Sakuo Tanaka
Original assignee: Sakuo Tanaka
Priority date: 2006-11-30
Filing date: 2007-11-28
Publication date: 2008-06-12
Also published as: JP4352181B2; JP2008138653A

Abstract

Provided is a moving-seal portion liquid-leakage preventing device for a piston pump, which is free from liquid leakage even under an extra-high pressure. The moving-seal portion liquid-leakage preventing device comprises a cylinder (1), a piston (2) for moving reciprocally in the cylinder (1), a ring for preventing the liquid leakage between the cylinder (1) and the piston (2), and a holding screw (8) for holding the ring. The device is characterized in that the ring is constituted by assembling alternately two kinds of rings of a plurality of piston-side rings (3) having two side faces of a truncated cone shape and a plurality of cylinder-side rings (4) having two side faces of a truncated cone shape.

Description

Rope

Piston pump

Technical field

TECHNICAL FIELD [0001] The present invention relates to a liquid leakage prevention device that prevents liquid leakage from a seal portion between a piston and a cylinder that reciprocate, such as an ultra-high pressure piston pump. Background art

[0002] Conventionally, as a liquid leakage prevention device for a movable seal part of a biston pump, elastic rubber, plastic, a metal ring or the like has been mainly used. (For example, see Patent Document 1)

Patent Document 1: Japanese Patent Laid-Open No. 1 1 1 5 1 1 9 3

Clarification

讖鱺 trying to solve ·

[0003] In the above-mentioned conventional device for preventing leakage of liquid from a biston pump, the liquid super-high pressure of 3,00 kgf Z square centimeters or more has recently been required, and elastic rubber and plastic If the pressure is higher, the higher the pressure is, the more elastic it will be, so it will be tightened tightly, so the frictional resistance will be larger, especially at ultra high pressures of more than OOO kgf Z square centimeters. There was a problem of seizure (galling) when the ring touched, but when it was tightened to such an extent that the ultra-high pressure liquid did not leak.

[0004] The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a liquid seal prevention device for a movable seal portion of a piston pump that does not leak even at an ultra-high E level. .

The Tanu that solves the spear ©

[0005] The liquid leakage prevention device for the movable seal portion of the piston pump of the present invention includes a cylinder, a piston that reciprocates in the cylinder, a ring that prevents liquid leakage between the cylinder and the piston, and the ring. In the device for preventing liquid leakage of the movable seal portion of the piston pump provided with a holding screw for holding The ring is a combination of two or more piston side rings and multiple cylinder side rings.

[0006] Further, the piston side ring is a ring with a trapezoidal outer slope on both side surfaces, the outer diameter side being thin and the inner diameter side being thicker. The outer diameter side is thicker, and the inner diameter side is thinner. The ring is not limited to metal as long as it has low elasticity and smoothness.

Dawn Φ effect

[0007] In the seal part where the piston pump reciprocates, high-pressure liquid flows from the pressurizing chamber to the working chamber and the inner slope of the truncated cone, and the stress is applied to the inner slope of the truncated cone of the ring holding screw. . Since the ring has an inclined surface (angle), the piston side ring is tightened with a pressure proportional to the pressure on the cylinder side and the cylinder side ring is on the cylinder side. Due to the above configuration, even if the cylinder is swelled with very high ultra-high pressure liquid and the inner diameter is slightly changed, the two types of rings are inevitably in the liquid pressure and the slope, and the ring on the Biston side is proportional to the liquid pressure. It is pressed against the tightened biston side, and the cylinder side ring is pressed against the J cylinder side, so it is proportional to the liquid pressure without excessive tightening even at an ultra-high E of 3, 00 kgf Z square centimeters or more. As the ring is tightened, there is no seizure or galling even during violent movements, thus preventing leakage.

Best practice to carry out dredging

[0008] Embodiment 1

FIG. 1 is a cross-sectional view in which a part of a movable seal portion liquid leakage prevention device of a piston pump showing a form of embodiment of the present invention is cut away. Fig. 2 is an enlarged sectional view of the seal part. Fig. 3 is an enlarged perspective view in which a part of the piston side ring is cut away. FIG. 4 is an enlarged perspective view in which one of the cylinder side rings is cut away. In the figure, reference numeral 1 denotes a cylinder, which is provided with a circular hole 1 a and a female screw 1 c of a ring insertion hole 1 b. 2 is a cylindrical piston that reciprocates in the hole 1 a of the cylinder 1. 3 is a piston-side ring. The outer diameter of the ring is made of phosphor bronze or gun metal. The inner side is narrower and the inner side is wider, both sides are n frustum-shaped outer slopes, and the cross section is trapezoidal. 4 is a cylinder side ring, such as stainless steel ^, both sides are frustoconical inner slopes, and the cross section is even formed into a trapezoid.

[0009] 8 is a ring holding screw for lightly screwing into the female screw 1c of the cylinder 1, and has a male screw portion 8a, a ring holding portion 8b, and an inclined surface 8c that presses against the piston side ring 3. The slope 8 G

Is formed on a truncated cone-shaped inner slope. 9 is an extra space formed between the cylinder 1 and the ring holding screw 8, and 5 is a pressurizing chamber formed between the cylinder 1 and the piston 2. 6 is a working chamber into which ultra-high pressure liquid that has penetrated from between cylinder 1 and piston 2 enters, and 7 is a slope inside the circumference. The ring retainer screw 8 is shaped like a flange joint, and the inner diameter is formed so that the piston 2 can be inserted.The outer diameter of the ring retainer 8b is the same as the outer diameter of the cylinder side ring 4. 8d is the outer periphery of the flange with the same outer diameter.

Next, a method of assembling the liquid leakage prevention device for the movable seal portion of the piston pump configured as described above will be described with reference to FIG.

First, the cylinder 1 is inserted so that the outer slope of the screw side ring 3 is aligned with the inner slope 7 of the working hole 1 b of the cylinder 1. Next, install 2 cylinder side rings 4 and 3 piston side rings 3 and insert the ring pressing screw 8 so that the inserted piston 2 does not have excessive resistance.

[0011] The operation of the invention will be explained. In the seal portion where the biston pump is reciprocatingly moved, a high-pressure liquid permeates from the pressurizing chamber 5 to the working chamber 6 to the frustoconical-shaped inner circumferential inclined surface 7. Intrusion occurs and stress is applied to the truncated cone-shaped inner slope 8 G of the ring retainer screw 8, and because the ring has a slope (angle), the piston side ring 3 is on the piston 2 side, the cylinder side ring 4 is on the cylinder 1 side, ) The ring is tightened by a stress proportional to the repulsive force. Due to this structure, the cylinder expands with a very high ultra-high pressure liquid. Even if the inner diameter is slightly changed, there are two types of rings depending on the liquid pressure and the slope. However, in proportion to the fluid pressure, the piston-side ring 3 is tightened and pressed against the Riviston 2 side, the cylinder-side ring 4 is spread and pressed against the cylinder 1 side, and there is no excessive tightening. In conjunction with the pressure, the two types of rings work moderately and the frictional resistance is low, resulting in a leak-proof device with no seizure.

[0012] Form 2

FIG. 5 is a longitudinal sectional view of a piston pump of different diameters showing Embodiment 2 of the present invention. Japanese Patent Laid-Open No. 2 0 4-2 1 8 6 1 9 This is quoted to explain the incorporation of the movable seal portion leakage prevention device of the present invention into an ultra high pressure different diameter piston pump. The side ring 4 is the same as that in the first embodiment. 1 Ί a is the front of the cylinder of different diameter, 1 l b is the rear of the cylinder of different diameter, and the inner diameter of the cylinder of different diameter 1 l b is larger than the inner diameter of the front of the cylinder of different diameter 1 1 a. 1 2 a is the front of the piston with a different diameter, and 1 2 b is the rear of the piston with a different diameter. Piston-side ring 3 and cylinder-side ring 4 are connected to the cylinder rear ring 1 の b with a large inner diameter and 1 1 b at the front of the cylinder with a different inner diameter. Incorporate

[0013] A piston pump of different diameter incorporating the present invention is not pressurized at the tip of the piston.

1 \ Piston part with different diameter, front part with different diameter from 1 2 b 1 2 a is a small cylinder, tapering the area obtained by subtracting the small cross-sectional area from the cross-sectional view of the rear part of piston with different diameter 1 2 b In addition, since the pressure is applied at the table par, the drag is dispersed. Since the cross-sectional area of the piston rear part 1 2 b with a different diameter with respect to the pressurized area is large, it can be pushed with a large force, so that the liquid can be pushed out at an ultra-high pressure.

[0014] The fact that the piston can reciprocate means that there is even a slight gap between the piston and the cylinder. Also, because the thermal expansion coefficient of the circumference of the piston is closer to the one side of the cylinder than the piston due to heat of compression, etc. When the movable seal leakage prevention device of the present invention is incorporated into a piston pump of a different diameter, the ring has a slant (angle) even if there is a slight bulge and deformation in the cylinder. Since the ring tightens proportionally and reasonably, the efficiency of piston pumps with different diameters is improved.

[0015] The present invention is incorporated into a piston pump of a different diameter, and the heat injection of a diesel engine. When used for shooting, it is possible to inject ultra-high-pressure heat materials more than ever, and fuel prices have soared. Compared to conventional ultra-high hydraulic pumps with the same extrusion amount, the hydraulic equipment in the cylinder is compact, and even when used as an ultra-high hydraulic pump, seaweed under the ship's bottom draft line at the site In addition, it is easy and easy to remove and clean the ridges, paint, etc. with ultra-high water pressure.

Sonoha

FIG. 1 is a cross-sectional view with a part cut away of a liquid leakage prevention device for a movable seal portion of a piston pump showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a movable seal portion of the present invention.

FIG. 3 is an enlarged perspective view in which a part of the piston-side ring of the present invention is cut away.

FIG. 4 is an enlarged perspective view in which a part of the cylinder side ring of the present invention is cut away.

FIG. 5 is a longitudinal sectional view of a biston pump of different diameters showing Embodiment 2 of the eighth embodiment.

1 Cylinder 1 a Piston insertion hole

1 b Ring hole 1 c Female thread

2 Piston 3 Piston side ring

3 a Biston ring inner slope 4 Cylinder side ring

4 a Slope on the cylinder side ring 5 Pressure chamber

6 Action chamber 7 Slope inside action

8 Ring retaining screw 8 a Male thread

8 b Ring retainer 8 c Ring retainer inner slope

8 d Flange circumference 9 Spare space

1 1 Different diameter cylinder 1 1 a Different diameter cylinder front

1 1 b Different diameter cylinder rear 1 2 a Different diameter piston front

1 2 b Different diameter piston rear

Claims

Demand

[1] Piston pump movable seal section provided with a cylinder, a piston that reciprocates in the cylinder, a ring that prevents liquid leakage between the cylinder and the biston, and a holding screw that holds the ring. In the liquid leakage prevention device, the ring is characterized by alternately incorporating two types of piston side rings having a plurality of truncated cones on both side surfaces and a cylinder side ring having a plurality of truncated cones on both side surfaces. Piston pump movable seal part liquid leakage prevention device.

[2] The above-mentioned biston side ring is thin on the outer diameter side and thick on the inner diameter side. Both side faces are frustoconical trapezoidal shaped cross-section trapezoidal rings. The above cylinder side ring is the outer diameter side thickness. 2. The liquid leakage prevention device for a movable seal part of a biston pump according to claim 1, wherein the both sides of the ring are trapezoidal rings with a truncated cone-shaped inner slope, and the inner diameter side is thin.