JP2002070724A - Leverless plunger pump for waterjet chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further reduce the minute vibration of pressure wave of the water discharged in a plunger pump, and to provide a simple, inexpensive constitution for the plunger pump requiring a small number of each part. SOLUTION: In the plunger pump for a waterjet chamber, a pump cam lever, which has been used as a common part, is eliminated, and the power from a pump cam 9 is directly transmitted to the reciprocating mechanism of a piston 3, while smooth movement between the piston and cylinder 2 is secured. Concretely, the piston of the reciprocating mechanism, which moves parallel along the cylinder's axial center is directly actuated by the pump cam via a cam floor 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plunger pump for an automatic loom, in which wefts are inserted by a water jet nozzle.

[0002]

2. Description of the Related Art A conventional plunger pump is used for a loom having a loom speed of about 1000 rpm, and has a structure as shown in FIG. This plunge pump has a water inlet channel 20 provided at one end with a suction ball valve 19 leading to a water source and at the other end a high pressure water discharge ball valve or a conical valve 19 leading to a water jet nozzle. Water is introduced into the cylinder 2 from the headrace channel 20 by the forward movement of the piston 3 in the cylinder 2 operated by the pump cam lever 21 interlocked with the pump cam 9, and when the pump cam 9 reaches the idling position, the spring 13 The repulsive force causes the piston 3 to move backward, discharges the introduced water as high-pressure water, and repeats the movement of sending the water from the water guide passage 20 to the water jet nozzle via the ball valve or the conical valve 19.

[0003] The high-pressure discharge water generated by the plunger pump having such a function has a short time to reach the maximum pressure in the water jet nozzle portion, and has less pressure fluctuation and small pressure vibration. hand,
Further, it is ideal to repeat a constant pressure waveform.

[0004] However, the loom speed is 1000 rpm.
The spring pressure of the plunger pump in a high-speed loom exceeding 200 kgf and the piston 3
The gap between the outer surface and the inner surface of the cylinder 2 is 10/10 in diameter.
As shown in FIG. 3, when the piston 3 reciprocates in the cylinder 2, the piston does not have straightness and a rattling phenomenon occurs, as shown in FIG. As a result of abnormal wear or inability to perform smooth movement, pressure fluctuations and minute vibrations of the discharge water occur, so that a constant pressure waveform cannot be obtained, and the waveform shown by the solid line in FIG. 5 is disturbed. This has an adverse effect on the jet stream that is jetted.

[0005] For this reason, the applicant of the present application has disclosed in
0-266950, for a water jet loom plunger pump operated by a pump cam lever interlocked with a pump cam, a roller guide for maintaining the straightness of the piston is arranged in a reciprocating passage of the piston and a plurality of interlocking frame rods. And one formed so that the water discharged from the cylinder changes direction through a curved pipe.

[0006] Furthermore, the applicant of the present application is disclosed in
044. A plunger for a water jet loom, characterized in that, with regard to actuation by a pump cam lever interlocked with a pump cam in 044, a coupling mechanism for connecting the pump cam and a piston interlocked with the lever has a structure in which the piston has a degree of freedom to move in the radial direction. Suggested pump.

The smooth movement between the piston and the cylinder is ensured by the above-mentioned Japanese Patent Application Laid-Open Nos. Hei 10-266950 and Hei 10-325044 and the plunger pump which combines the functions of the two patent applications, and the pressure waveform of the discharge water is obtained. Is
As shown in FIG. 6, pressure fluctuations and micro-vibrations are reduced, and a jet water stream with good convergence can be generated. However, because the pump cam lever interlocking with the pump cam is interposed between the piston and the driver,
The force acting against the repulsive force of the spring when discharging the high-pressure water acts, and the rattle of each interlocking part and the vibration of the cam lever cause a slight vibration of the pressure waveform of the discharged water, which causes Convergence was not completely satisfactory.

[0008]

The problem to be solved by the present invention is to further reduce the micro-vibration of the pressure waveform of the discharge water in such a plunger pump and to provide a simple and inexpensive structure with a small number of various parts. To provide.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a water jet loom plunger pump, in which a pump cam lever, which has been conventionally used as a common sense part, is eliminated, and the power of the pump cam is reciprocally operated by a piston. And to ensure smooth movement between the piston and the cylinder.

More specifically, water is introduced into the cylinder from the inlet tube by the forward movement of the piston in the cylinder operated by the pump cam, and the introduced water is moved back by the repulsive force of the spring mechanism to cause high pressure water. The plunger pump for a water jet loom that discharges water and sends it to a water jet nozzle is characterized in that a piston of a reciprocating mechanism that moves in parallel with an axial direction of a cylinder is directly operated by a pump cam via a cam floor. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a component for removing the pump cam lever and directly transmitting the power of the pump cam to the reciprocating mechanism of the piston, the center of the pump cam is located in front of the piston axis, It is important that the pump cam abut on the cam floor fixed to the shaft holder of the reciprocating mechanism of the above.

The embodiments of the present invention will be clarified by the following examples, but the present invention is not limited to these examples.

[0013]

FIG. 1 shows an embodiment of the present invention, in which a cam floor 8 fixed to a shaft holder A6 of a reciprocating mechanism is pressed by a half rotation of an eccentric thick side of a pump cam 9 so that a pump is driven. Simultaneously with the compression of the spring 13, the piston in the cylinder 2 moves forward to introduce water from the inlet tube 10 into the cylinder 2, and then, the operating force of the pump cam 9 during the half rotation to the thin eccentric side of the pump cam 9 is In a free state, the compression force of the pump spring 13 is released at a stretch, and the pump spring 1 is released.
The reciprocating action of 3 causes the piston in the cylinder 2 to move backward, and the water in the cylinder 2 is sent as high-pressure discharge water from the outlet tube 11 to a water jet nozzle (not shown). In addition, the direction in which water flows is indicated by a solid arrow in FIG. The reciprocating mechanism of the piston 3 fixes the shaft 4 guided by bearings 5 arranged at a plurality of positions on the outer peripheral portion of the cylinder 2 with a shaft holder A6 and a shaft holder B7. By connecting the flange-like base end portion 31 of the piston 3 to the fixing screw 14 in a center-free state, the piston 3 in the cylinder 2 can smoothly reciprocate coaxially with the cylinder 2, and the shaft holder B
7 serves as a seat for the spring 13.

Therefore, according to the plunger pump of the present invention, the power of the pump cam 9 is controlled by the piston 3 connected to the reciprocating mechanism that moves in parallel with the axis of the cylinder 2.
Directly, the rattling and micro-vibration generated by the intervention of the conventional pump cam lever 21 are eliminated. As shown in FIG. 7, the pressure waveform of the discharge water at the water jet nozzle is The vibration of the rising portion of the pressure is almost eliminated, and the generation of the jet water stream is very small, and the jet water stream having a strong convergence and a strong weft conveyance force is generated.

FIG. 6 shows that the piston diameter is 12.5 mm.
5 shows the results of cumulative recording of the discharge water pressure waveform generated during 30 seconds (520 picks) by operating the plunger pump with a spring pressure of 70 kgf at a loom speed of 1040 rpm.

For comparison, a conventional plunger pump shown in FIG. 2 and Japanese Patent Application Laid-Open No. 10-325044 shown in FIG.
A performance comparison test with the plunger pump disclosed in FIG. Fig. 5 by conventional plunger pump
Has a piston diameter of 16 mm and a spring pressure of 200 kg
One pick when the plunger pump of f is operated at the loom speed of 800 rpm (corresponding to one reciprocation of the piston)
The pressure waveform of the discharge water generated per hit is shown. FIG. 6 of Japanese Patent Application Laid-Open No. 10-325044 shows that the piston diameter is 12.12.
A plunger pump of 5 mm and a spring pressure of 70 kgf is operated at a loom speed of 1040 rpm, and is operated for 30 seconds (5 seconds).
This is a cumulative recording of the pressure waveform of the discharge water generated at 20 picks). As can be seen from these figures, the conventional example shows a continuous pressure waveform in which the jagged irregularities are continuous, indicating that the jet water flow has many droplets and is inferior in convergence. In addition, the pressure waveform in FIG. 6 by the plunger pump of Japanese Patent Application Laid-Open No. H10-325044 shows that the rising portion of the pressure is vibrated because the cam lever is interposed in the plunger pump, and the jet water stream has a slight splash. It tells what was happening.

[0017]

According to the present invention, the following effects can be obtained.

(1) Since the force that resists the repulsive force of the spring due to the interposition of the cam lever is eliminated, the minute vibration of the pressure waveform at the time of the rise of the discharge water pressure is eliminated, and a jet water stream with little scatter is obtained. (2) Since the power of the pump cam is directly transmitted to the reciprocating operation mechanism of the piston, energy saving of the power can be achieved. (3) Since there is no rattling phenomenon of the cam lever, noise is reduced. (4) The plunger pump has a very simple structure,
Consumable parts are few and durability is improved. (5) Since a stable jet water flow without pressure variation can be obtained, the stoppage of the loom due to poor weft insertion is extremely reduced, and the operating rate of the loom is improved. (6) Since a stable discharge water pressure is obtained, a woven fabric having a good texture without fluctuation of the weft tension due to the jet water flow can be obtained.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention.

FIG. 2 shows a conventional plunger pump having a connecting mechanism.

FIG. 3 is a diagram illustrating a problem of a conventional plunger pump.

FIG. 4 shows a plunger pump having a connecting mechanism of the prior application.

FIG. 5 shows a pressure waveform of discharge water in a conventional water jet nozzle unit.

FIG. 6 shows a pressure waveform of discharge water at a water jet nozzle of the prior application.

FIG. 7 shows a pressure waveform of discharged water in a water jet nozzle portion of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump body 2 Cylinder 3 Piston 31 Flanged base end 4 Shaft 5 Bearing 6 Shaft holder A 7 Shaft holder B 8 Cam floor 9 Pump cam 10 Inlet tube 11 Outlet tube 12 Overflow pipe 13 Pump spring 14 Piston fixing screw 15 Adjust washer 16 Adjust Bolt 17 Lock nut 18 Spring holder 19 Ball valve or conical valve 20 Headrace 21 Pump cam lever 22 Fixed casing 23 Moving casing 24 Swing fulcrum 25 Interlocking frame rod 26 Driver 27 Roller guide

Claims (2)

[Claims] 1. Water is introduced from an inlet tube into a cylinder by a forward movement of a piston in a cylinder operated by a pump cam, and the introduced water causes the piston to move backward by a repulsive force of a spring mechanism to discharge high-pressure water. A plunger pump for a water jet loom, which is fed to a water jet nozzle, wherein a piston of a reciprocating mechanism that moves in parallel with an axial direction of a cylinder is directly operated by a pump cam through a cam floor. Plunger pump for room. 2. The water jet loom plan according to claim 1, wherein the piston of the reciprocating mechanism is connected to the shaft in the bearing guide, the shaft holder, the piston fixing screw, and the cam floor. Jar pump.