KR20160142533A

KR20160142533A - Waterjet Pump

Info

Publication number: KR20160142533A
Application number: KR1020150078388A
Authority: KR
Inventors: 김혜자
Original assignee: 김혜자
Priority date: 2015-06-03
Filing date: 2015-06-03
Publication date: 2016-12-13

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a water jet pump that ejects water at an ultra-high pressure and performs cutting using energy possessed by the water jet,
The water jet pump according to the present invention is disposed between a pair of fixed plates fixed on a base frame and pressurized and discharged by a reciprocating motion of a movable plate operated by a lead screw, It is possible to discharge the high-pressure / ultra-high-pressure fluid without the hydraulic mechanism.
In addition, unlike the conventional lead screw type water jet pump, the resistance of the pressurized soil can be stably dispersed and supported by a plurality of screw members, both ends of which are rotatably installed on the fixed plate, It becomes possible to manufacture an ultra high pressure water jet pump without applying a screw, and the structure and the manufacturing process can be simplified.

Description

Waterjet Pump {Waterjet Pump}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet pump, and more particularly, to an improvement of a water jet pump that ejects water at an ultra-high pressure and performs cutting using the energy of the jet (jet flow).

WaterJet cutting is a processing method in which an abrasive is mixed with high-pressure water or water, and is sprayed onto the object at a high pressure. Water jet processing is advantageous in that it does not cause thermal changes to the object because heat is not generated during the operation, and there is an advantage that almost no burr is left after the completion of processing, and there is an advantage that it can be used for objects of any material, Plastic, FRP, Kevlar, printed board, other composites, glass, fiberglass, ceramic, wood, plywood, asbestos, It is widely applied to cutting various materials such as gypsum board, tile, other building materials, concrete, cement, asphalt, iron, nonferrous metal, stainless steel, other special metals, frozen meat,

In such a water jet pump, as a method for producing high-pressure water, it is considered that a method of increasing the pressure by a pressure-receiving area difference of a piston operated by hydraulic pressure and a reciprocating motion of the piston by the crankshaft There is a crank system for injecting high-pressure water and a lead screw system for injecting high-pressure water by the reciprocating movement of the piston by the lead screw.

1 is a view showing a water jet pump disclosed in Korean Utility Model Registration No. 20-0289950 as an example of a booster type water jet pump.

The water jet pump shown in Fig. 1 is configured such that the working fluid discharged from the hydraulic pump 102 by the operation of the motor 101 is alternately supplied to the left and right of the main piston 112 provided in the main cylinder 111 via the directional control valve 103 The piston rod 113 connected to the main piston 112 by the operation of the main piston 112 is continuously moved in the high-pressure cylinder 121 by the operation of the main piston 112, And the pressure of the working fluid increases in accordance with the ratio of the sectional area A1 of the main piston 112, that is, the hydraulic pressure area of the main piston to the sectional area A2 of the piston rod 121, that is, And the water introduced into the high-pressure cylinder through the check valve is discharged through the high-pressure water.

Therefore, a pressure boosting type jet pump is also called a pressure boosting unit.

Reference numeral 130 denotes a check valve integrated in a row.

Although such a booster system is highly reliable, there is a disadvantage in that the efficiency is not good because a separate hydraulic system must be driven for the booster, and it is difficult to keep the surrounding environment clean due to excessive noise and oil leakage There was a problem.

The crank method (not shown) is a method of injecting high-pressure water by reciprocating motion of a piston through a crankshaft rotated by a motor, similar to the operation principle of a crank-piston of an automobile engine. Although it has the advantages of high efficiency and low noise, it has a disadvantage in that the pressure can not be saved and maintained. That is, when the water jet apparatus does not actually perform cutting, the pressurized water must be discharged from the relief valve, which means that the pump uses the same amount of power in a state in which the cutting operation is not being performed, Therefore, it can not be said that it is higher than the pressure boost type jet pump in terms of overall power efficiency.

As a water jet pump for solving the disadvantages of the pressure increasing method and the crank method method, a lead screw method of releasing high pressure water by the reciprocating motion of the plunger connected to the lead screw has been proposed and gradually widened its application range.

2 is a view showing a water jet pump disclosed in Japanese Laid-Open Patent Publication No. 2011-515616. In the water jet pump 200 shown in Fig. 2, water introduced into a cylinder 221 is introduced into a cylinder at 50000 psi And a servo motor for driving the reciprocating piston 222 installed in the cylinder so as to be compressed at an ultra high pressure of.

The water jet pump 200 has a cylindrical housing 210 surrounded by a cylindrical water-cooled cooling jacket 211. The housing 210 has a hollow rotor 231 disposed inside the winding 231 of the servo motor, And an end flange for supporting the shaft 232.

A screw nut 241 is integrally coupled to the rotor shaft 232, and the screw nut 241 is screwed to the elongated screw 242.

The screw 242 is provided with an engaging portion 242a to be screwed with the screw nut 241 and a flat surface portion 242b for guiding the linear reciprocating motion by preventing the screw from rotating. Is supported by a linear bearing (243).

With the above configuration, when current flows through the winding 231 of the servo motor and the rotor shaft 232 rotates in the normal and reverse directions, the roller nut 241 integrally coupled to the rotor shaft 232 rotates in the forward and reverse directions The screw 242 screwed to the roller nut 241 linearly reciprocates so that each of the pistons 222 coupled to both ends of the screw 242 reciprocates inside the cylinder 221 , The high pressure water is sucked / injected alternately.

Reference numeral 223 denotes a check valve, reference numeral 223a denotes a water inlet, reference numeral 224 denotes a high-pressure water discharge nozzle, and reference numeral 233 denotes an annular bearing for supporting the rotor shaft 132.

Since the lead screw type water jet pump having such a configuration does not use a separate hydraulic pump, it is possible to solve the drawbacks of the pressure increase type jet pump including low efficiency, noise problem, Even if the operation of the drive motor is interrupted between the operations, the reverse movement of the piston is prevented by the self locking action between the lead screw and the nut, and the pressure inside the cylinder can be saved and held thereby, Unlike a waterjet pump, there is no need to drive the motor unnecessarily between the work and the operation, thereby achieving higher efficiency than a crank-type waterjet pump.

However, since the servo motor is installed in the body in the longitudinal direction concentrically with the cylinder, and accordingly, the lead screw is also required to be installed in the longitudinal direction together with the cylinder in the center of the body, the structure and manufacturing process are complicated, There was a problem.

Further, in order to increase the discharge pressure, the diameter of the lead screw must be formed so as to be large in proportion thereto so as to withstand the pressure. Particularly, in the case of manufacturing an ultra-high pressure water jet pump, As a matter of fact, such a large-diameter leadscrew mechanism is extremely difficult to process with the required precision, which not only becomes a fundamental factor of manufacturing cost increase, but is also largely dependent on imports.

Disclosure of Invention Technical Problem [10] The present invention provides a lead screw type water jet pump capable of discharging ultra-high pressure while having a simple structure, and simplifying a manufacturing process and reducing cost, in order to solve the problems of the conventional lead screw type water jet pump. The purpose is to provide.

In the present invention, if the main cylinder for pressure increase of the booster type water jet pump or the hydraulic piston is replaced by a lead screw drive structure having a proper structure, a high pressure / ultra high pressure Based on the point of view that the water can be discharged and the test result,

A water jet pump according to the present invention includes: a base frame; A pair of fixing plates fixedly installed on the base frame at regular intervals; A cylinder installed at each of the pair of fixing plates and having both ends opened; A high-pressure discharge nozzle and a check valve provided on an outer opening side of each of the cylinders; A plurality of screw members rotatably supported at both ends of the pair of fixing plates; A driven member fixedly installed on one side of each of the screw members; Driving means for rotating the driven means in normal and reverse directions; A nut member screwed to each of the screw members; Wherein the nut member is integrally fixed with the fixing plate between the pair of fixing plates so that the nut member is reciprocated by normal and reverse rotation of the screw member, A movable plate reciprocating between the cylinders; Wherein the one end side is fixed to the movable plate and the other end side is slidably disposed in the cylinder so as to reciprocate together with the movable plate, And a pair of plungers for alternately sucking the fluid into the inside and alternately discharging the sucked fluids.

According to the water jet pump of the present invention having the above features, since the fluid is pressurized and discharged by the reciprocating motion of the movable plate which is disposed between the pair of fixed plates fixed on the base frame and operated by the lead screw , It becomes possible to discharge the high-pressure / ultra-high-pressure fluid without a separate hydraulic mechanism for pressurization.

In addition, unlike the conventional lead screw type water jet pump, the resistance of the pressurized soil can be stably dispersed and supported by a plurality of screw members, both ends of which are rotatably installed on the fixed plate, It becomes possible to manufacture an ultra high pressure water jet pump without applying a screw, and the structure and the manufacturing process can be simplified.

It is preferable that the three screw members are arranged in a regular triangle shape on the fixed plate and a pair of plungers disposed on both sides of the movable plate are arranged at positions corresponding to the centers of the three screw members desirable.

According to this aspect of the present invention, when the fluid is pressurized, the equal stress acts on each screw member in a well-balanced manner, so that the effect of evenly distributing the load and reliability of operation can be ensured. According to the simulation and the experimental results, when three screw members are used, due to a sufficient load-dispersing effect, even if the water jet pump which is currently on the market and has the highest pressure, the screw member is formed to have a proper diameter for easy processing And it is possible to form an optimal power transmission path when each of the driven devices is operated as one driving device.

Each of the driven means provided on one side of the plurality of screw members may be driven by a separate drive means, but each of the driven means may be provided on the same vertical plane across the screw member, It is preferable to drive by the driving means.

According to the above features of the present invention, not only the overall structure of the apparatus can be simplified, but also the control of the apparatus can be simplified by simplifying the driving means.

According to the test manufacture and the operation test results of the present invention, since each screw member is installed on the fixed plate with the nut member fastened, the movable plate is operated by the plurality of screw members driven by the single drive means It is confirmed that stable operation of the movable plate is possible without adverse effects such as machining errors of the screw member and the nut member.

The screw member may be driven by using a servomotor capable of normal / reverse control. However, instead of an expensive servo motor, a one-way rotary motor which is generally used is applied, It is possible to save the cost despite the increase in the number of components and to simplify the control circuit.

According to the water jet pump of the present invention, since the fluid is pressurized and discharged by the reciprocating motion of the movable plate which is disposed between the pair of fixed plates fixed on the base frame and is operated by the lead screw, Pressure fluid can be discharged without a hydraulic mechanism of the hydraulic pump, and at the same time, unlike a conventional lead screw type water jet pump, the resistance of the pressurized soil is increased by a plurality of screw members, It is possible to manufacture an ultra high pressure water jet pump without applying expensive lead screws having a large diameter, and also to simplify the structure and manufacturing process.

1 is a cross-sectional view showing an example of a conventional pressure increasing type water jet pump.
2 is a sectional view showing an example of a conventional lead screw type water jet pump.
3 is a perspective view showing the overall configuration of a water jet pump according to an embodiment of the present invention.
4 is a cross-sectional view of a main portion showing a pumping operation portion of the present invention.
5 is a view showing another embodiment of the present invention, and is a perspective view showing an embodiment in which a one-way electric motor and a direction switching transmission are applied as driving means.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3, the water jet pump according to one embodiment of the present invention includes a base frame 1, a pumping operation part 2 installed on the upper part of the base frame, (Not shown).

The base frame 1 can be any structure that stably supports the pumping operation unit 2 and the driving unit 3 and can be operatively connected to each other. In this embodiment, But it is also possible to form it in a box form or in a movable form.

The pumping operation portion 2 is driven by the drive portion 3 and is a portion for discharging high-pressure fluid. The pumping operation portion 2 includes a pair of fixed plates 10 fixedly installed at an upper portion of the base frame 1 And a movable plate (20) reciprocally disposed between the fixed plates.

The fixing plate 10 is formed in a substantially flat plate shape and fastened to the upper portion of the base frame 1 with screws or the like in a state in which a pair of left and right sides are arranged parallel to each other as shown in Fig.

A plurality of screw members 30 are rotatably coupled through bearings 31 between the both side fixing plates 10 and a cylinder 11 for providing a space in which the fluid is sucked and compressed is mounted on each of the fixed plates 10 extending outwardly.

In this embodiment, three cylinders 11 are provided on the center line of the screw so that three screw members 30 are provided and the load during the fluid compression can be stably supported. However, Even when two screw members 30 are provided, the two screw members 30 are provided so as to face each other with respect to the cylinder 11 so as not to act on the cantilever type load on the movable plate 20 desirable.

The nut member 21 fixed to the movable plate 20 is fastened to each of the screw members 30 so that the nut member 21 makes a linear reciprocating motion by the forward and reverse rotation of the screw member 30 , So that the movable plate 20 also reciprocates linearly.

One side of the plunger 22 is fixed to the movable plate 20 and the other side of the plunger 22 is slidably inserted into the cylinder 11, As the plate 20 reciprocates, the plunger 22 also reciprocates.

On the opposite side of the cylinder 11 on the side where the plunger is inserted, a check valve that is opened when the fluid is sucked into the cylinder and is closed when the pressure inside the cylinder becomes high, and a high-pressure bulb nozzle that discharges the fluid compressed by the high- As shown in FIG. 1, a check valve integrated with a check valve unit 12 is provided as an example. However, as shown in FIG. 2, it is also possible to install a check valve and a nozzle separately It is acceptable.

On the other hand, a timing gear 32 is fixed to one side of each of the screw members 30 to rotate the screw member 30 in the normal and reverse directions. The timing gear 42 and the timing gear 42 provided on the motor shaft of the drive motor 41 And is connected to a timing belt 43.

As a drive motor 41, it is possible to apply a servomotor capable of forward and reverse control. However, instead of an expensive servo motor, a one-way rotary motor 41a generally used as shown in Fig. In the case of adding the transmission mechanism 44 for converting the rotation torque of the electric motor in the normal direction and transmitting it, the cost can be saved in spite of the increase in the number of parts, and the control circuit can be simplified.

It is preferable that the forward-and-reverse shifting transmission mechanism 44 be dedicated to a planetary gear type transmission similar to an automatic transmission of an automobile.

Reference numeral 13 denotes a reinforcing bar for stably supporting the both side fixing plates 10, 11a denotes a guide bush, and 12a denotes a header for fixing the check valve block 12 of the integrated type.

According to the water jet pump of the present invention configured as described above, the movable plate 20, which is disposed between the pair of fixed plates 10 fixed on the base frame 1 and is operated by the screw member 30, It is possible to discharge the high-pressure / ultra-high-pressure fluid without a separate hydraulic mechanism for pressurization.

In addition, unlike the conventional lead screw type water jet pump, the resistance of the pressurized soil can be stably dispersed and supported by the plurality of screw members 30, both ends of which are rotatably mounted on the fixed plate, It becomes possible to manufacture an ultra-high pressure water jet pump without applying expensive lead screws, and the structure and manufacturing process can be simplified

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.

10: stationary plate 20: movable plate
30: screw member 11: cylinder
21: nut member 22: plunger

Claims

A base frame;
A pair of fixing plates fixedly installed on the base frame at regular intervals;
A cylinder installed at each of the pair of fixing plates and having both ends opened;
A high-pressure discharge nozzle and a check valve provided on an outer opening side of each of the cylinders;
A plurality of screw members rotatably supported at both ends of the pair of fixing plates;
A driven member fixedly installed on one side of each of the screw members;
Driving means for rotating the driven means in normal and reverse directions;
A nut member screwed to each of the screw members;
Wherein the nut member is integrally fixed with the fixing plate between the pair of fixing plates so that the nut member is reciprocated by normal and reverse rotation of the screw member, A movable plate reciprocating between the cylinders;
Wherein the one end side is fixed to the movable plate and the other end side is slidably disposed in the cylinder so as to reciprocate together with the movable plate, And a pair of plungers for alternately sucking the fluids into the inside and alternately discharging the sucked fluids.

The method according to claim 1,
Wherein the three screw members are disposed on the fixed plate in an equilateral triangle shape,
And the pair of plungers provided on the movable plate are disposed at positions corresponding to the centers of the three screw members.

3. The method according to claim 1 or 2,
Wherein each of the driven means provided on one side of the plurality of screw members is provided on the same vertical plane across the screw member and is driven by one driving means.

3. The method according to claim 1 or 2,
Wherein said drive means comprises a servomotor capable of normal / reverse control.

3. The method according to claim 1 or 2,
Wherein the drive means includes a uni-directional rotation type motor and a transmission mechanism for converting the rotation of the motor in the normal and reverse directions.