JP3390892B2 - Liquid pressure processing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid pressure treatment apparatus using a reciprocating pump such as a plunger pump.

[0002]

2. Description of the Related Art When a high pressure liquid is used for cutting a material or pressurizing a pressure vessel, a hydraulic booster type high pressure pump based on Pascal's principle is widely used as a liquid pressure source. The hydraulic booster boosts the inlet pressure in inverse proportion to the pressure receiving area ratio of the plunger piston and uses it as the outlet pressure. This is roughly classified into intermittent boosting of a predetermined flow rate for each stroke. There are a single-acting booster that sends pressure to the outlet side, and a double-acting booster that sends a continuous flow rate to the outlet side by combining a pair of single-acting boosters with a check valve and a direction switching valve.

The plunger is generally driven by a hydraulic system, for example, a free piston pressurizing system as shown in FIG. In this system, the reservoir 210 containing the processing liquid,
Liquid supply pump 22 for pressurizing and supplying the processing liquid to the pressure vessel
0, a heating container 230 in which a pressure container is installed, a heating device 240 that heats the entire heating container, and a pressure device 250 that pressurizes each pressure container in the heating container.

Inside the heating vessel 230, a pressure vessel 231,
233 and 235 are installed. Pressure vessel 231
233 and 235 are free pistons 232 and 234.2
36 inside each, and the free piston of each free piston
The inside of the bar side is filled with the processing liquid from the reservoir 210, while the pressure processing side is filled with the pressure oil from the pressure device 250. The free piston is a pressure device 25 in the direction of arrow A.
It moves with a hydraulic pressure of 0, and moves in the direction of arrow B with the pressure of the liquid supply pump 220.

[0005] In this device is to permit continuous processing, any of the pressure vessel also being connected by direct piping to the reservoir 210 and the external device 260, further, conducted shift processing step of the pressure vessel Thus, each free piston operates in a different phase from each other. That is, in the state shown in FIG.
1 is moved free piston 232 in the arrow A direction by the pressure device 250 performs pressurization stroke, the pressure vessel 233 is substantially completed discharge stroke, the pressure vessel 234
Has almost completed the inhalation process .

In this method, since there is almost no differential pressure between the upper and lower sides of the free piston, the abrasion due to the sliding of the seal packing is extremely reduced, and no abrasion powder is generated. If the hydraulic fluid discharged during depressurization is used to pressurize another container, the pressurization time is shortened and the productivity is improved.

In addition, there is an oil / water separation type in which the drive cylinder chamber and the pressure boosting chamber are separated in order to prevent the high pressure liquid (such as water) taken out from the outlet from being contaminated by the drive pressure oil. As a liquid pressurizing device for use in pressurizing food with a high-pressure liquid, which has been attracting attention in recent years in the production of jam, fruit juice, liquor, etc., an electric system that does not cause contamination by driving pressure oil is used. The one that reciprocally drives the plunger is often used.

For example, Japanese Utility Model Laid-Open No. 1-76570 discloses a reciprocating pressure booster for generating a high-pressure water jet used for cutting materials as a liquid pressurizing device using an electric double-acting booster. It is shown. In this reciprocating pressure booster, liquid discharged from a rotary pump for supplying liquid is introduced into a pair of reciprocating plunger pressurizing chambers via check valves, respectively, and a pair of coaxially connected plungers are connected to each other by a ball. By reciprocating integrally with the screw mechanism and the reversible servomotor, alternate pressurization operations by the plungers are performed in each pressurizing chamber, and high pressure liquids alternately discharged from each pressurizing chamber are separated. It sends to the injection nozzle through the check valve of (1) to obtain a substantially continuous injection of high-pressure liquid from the injection nozzle.

[0009]

By the way, when the pressure treatment of food is taken into consideration from the viewpoint of application, it is required to secure hygiene during the pressure treatment. Therefore, the drive pressure oil is the seal surface of the plunger drive shaft. It is natural that an electric-type booster that does not have these fears is more suitable than a hydraulic drive system that may get mixed into the pressurizing chamber via the There is.

However, the conventional electric booster requires a separate pump for supplying the liquid to the pressurizing chamber of the plunger as described above. The capacity of this pump needs to be selected with some margin because the amount of supply to the pressurizing chamber is not constant, and not only does the installation of the pump complicate the configuration of the device, but also the rotary pump for liquid supply. Since the pump was used, the liquid circulates in the pump and the liquid quality changes, and in some cases air bubbles are mixed in the liquid before being pressurized in the pressurizing chamber and the target pressure is reached. As a result, it took a long time to adversely affect the efficiency of the pressure treatment.

In the conventional electric booster, the discharge pressure of the liquid supply pump is so low as to be insufficient as the initial seal of the pressurizing chamber of the booster, and when the flow rate is small, the seal leaks. It may happen.

[0012] On the other hand, if the pressure treatment, inevitably reduced pressure line
In the past, the pressure was reduced by gradually releasing the valve of the container in which the liquid under pressure was accumulated, but due to the sudden pressure reduction, the precision part of the valve, which is an ultra-high pressure component, was used. An extraordinary force is applied, which shortens the life of the valve and reduces the reliability of the processing device. Further, if the treated liquid is ejected from the valve, the liquid may be deteriorated, which is not preferable in terms of quality control.

The present invention has been made in view of the above problems, and has a simple reciprocating pump type liquid pressurizing apparatus having a structure in which the liquid to be supplied is not circulated unnecessarily. The purpose is to provide.

Another object of the present invention is to provide a liquid pressure treatment apparatus which makes it easy to adjust the pressure of a liquid.

[0015]

In order to solve the above problems, in the invention described in claim 1, the first reciprocating pump means for sucking in and discharging the liquid and the first reciprocating pump means are provided. The first reciprocating pump means interlocks with the first reciprocating pump means such that the discharge stroke is performed during the intake stroke, and conversely, the first reciprocating pump means is the suction stroke during the discharge stroke. Second reciprocating pump means for sucking the liquid discharged from the nozzle and discharging the liquid to the outside, and second reciprocating pump means driven independently of the first reciprocating pump means and the second reciprocating pump means. Third, in which the pressure of the liquid sucked into the dynamic pump means is restored after being pressurized for a predetermined time
Reciprocating pump means and the capacity of the first reciprocating pump means is substantially equal to the total capacity of the second reciprocating pump means and the third reciprocating pump means. During the predetermined time, the reciprocating motions of the first reciprocating pump means and the second reciprocating pump means are temporarily stopped, and after the third reciprocating pump means is returned.
To the second reciprocating pump and the third reciprocating pump
To enter the discharge process.

According to a second aspect of the invention, in the liquid pressure treatment apparatus according to the first aspect of the present invention, the first and second reciprocating pump means convert the rotary motion into a linear reciprocating motion. The third reciprocating pump means is driven by a motor through the converting means, and the third reciprocating pump means is driven by a servo motor which operates according to the pressure state of the liquid.

[0017]

In the invention described in claim 1, the first reciprocating pump means and the second reciprocating pump means are the first reciprocating pump means.
When the dynamic pump means is in the suction stroke, it becomes the discharge stroke,
On the contrary, when the first reciprocating pump means is in the discharge stroke,
Since interlocked so that incoming stroke, when the first reciprocating pump means is in intake stroke is a second reciprocating pump means is in the discharge stroke, on the contrary, the first reciprocating pump means discharge stroke The second reciprocating pump means is in the suction stroke.

The first reciprocating pump means sucks the liquid from a reservoir or the like in the suction stroke, reverses the stroke end, and discharges the sucked liquid when entering the discharge stroke. Therefore, since the first reciprocating pump means self-sucks the liquid from the reservoir or the like, it is not necessary to use a conventional liquid supply pump, and the liquid is pumped in a state where bubbles are not contained in the liquid. Supply to the first reciprocating pump means. As described above, in the present invention, since the liquid supply pump is unnecessary, the structure of the device is simplified, and since the liquid is not unnecessarily circulated in the device, the generation of air bubbles and the change of the liquid quality hardly occur. .

The second reciprocating pump means sucks the liquid discharged from the first reciprocating pump means when the first reciprocating pump means is in the discharge stroke. When the first reciprocating pump means reverses at the stroke end and enters the suction stroke,
The second reciprocating pump means enters the discharge stroke.

Since the capacity of the first reciprocating pump means is substantially equal to the total capacity of the second reciprocating pump means and the third reciprocating pump means, it is discharged from the first reciprocating pump means. In addition to the amount of the liquid sucked into the second reciprocating pump means, a surplus amount is generated.

The third reciprocating pump means supplies a liquid corresponding to the surplus amount of the liquid discharged from the first reciprocating pump means when the second reciprocating pump means is in the suction stroke. Inhale. The second reciprocating pump means is a
Even if it reaches the end, it will immediately reverse and will not enter the discharge stroke,
The second reciprocating pump means stops at the stroke end while the third reciprocating pump means enters the pressurization stroke.

In the pressurizing stroke, the third reciprocating pump means first pressurizes the liquid in the pressurizing chamber of the second reciprocating pump means, which was previously sucked by the discharge operation, and pressurizes for a predetermined time. after holding the state to return the pressure in the pressurizing chamber of the second reciprocating pump means the pressure stroke state before the return operation. After that, the second reciprocating pump means and the third reciprocating pump means both enter the discharge stroke . Therefore, the pressurized liquid is smoothly depressurized by the third reciprocating pump means before being discharged, so that when the liquid is discharged, an extraordinary force is exerted on the ultra-high pressure component such as the precision portion of the valve. As a result, it does not shorten the service life of the components used in the device. Further, since the liquid to be ejected does not eject, the quality of the liquid does not change.

In the invention described in claim 2, since the first reciprocating pump means and the second reciprocating pump means are driven by the same motor, the number of motors used is small. Become.

Further, since the third reciprocating pump means is driven by the servo motor which operates according to the pressure state of the liquid, the liquid pressurization is finely adjusted, and the set pressurization value and the actual pressurization value are set. The difference from the value that is applied to is small.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of a liquid pressure treatment apparatus according to an embodiment of the present invention. In FIG. 1, a plunger pump 10A as a first reciprocating pump means includes a liquid supply cylinder 11A and a plunger 13A that reciprocates in the cylinder 11A to periodically change the volume of a pump chamber 12A. Has been done. Plunger 13
A moves in the direction of arrow B in the drawing to suck the liquid into the pump chamber 12A (suction stroke), and conversely moves in the direction of arrow A to discharge the liquid sucked in the suction stroke (discharge stroke). ).

The plunger pump 10B as the second reciprocating pump means is a high-pressure processing cylinder 11B and the pump chamber 12B by reciprocating in this cylinder 11B.
And a plunger 13B that periodically changes the volume of the. The plunger 13B is indicated by an arrow A in the figure.
By moving in the direction, the liquid is sucked into the pump chamber 12B (suction process), and by moving in the direction of the arrow B, the liquid sucked in the suction process is discharged (discharging process).

The plunger pumps 10A and 10B are
By integrally fixing the liquid supply cylinder 11A and the high-pressure processing cylinder 11B to both ends of the cylinder housing 11, the plunger tail ends are arranged coaxially in opposite directions so that the plunger tail ends face each other. The spaces are integrally connected by a precision ball screw shaft 13 as a driving member that linearly reciprocates by a driving motor. By periodically reciprocating the ball screw shaft 13 in the axial direction, the two plungers 13A and 13B integrally reciprocate with the same stroke length, whereby the plunger pumps 10A and 10B.
B performs a so-called push-pull operation such that when one is in the suction stroke, the other is in the discharge stroke.

In order to integrally reciprocate the plungers 13A and 13B of the plunger pumps 10A and 10B by means of the ball screw shaft 13, a motor 21 is attached to the cylinder housing 11 and the balls are also attached. A screw shaft 13 and a rotary nut 14 that is precisely screwed through a ball are rotatably supported at a fixed position of the housing 11, and a space between the rotary shaft of the motor 21 and the rotary nut 14 is provided. ,
The toothed endless belt 22 is connected by a rotation transmission mechanism. Thus, when the motor 21 rotates in one direction, the rotation of the rotary nut 14 moves the ball screw shaft 13 in the direction of arrow A, and when the motor 21 rotates in the other direction, the rotary nut 14 rotates. The rotation of the ball screw shaft 13 moves in the direction of arrow B.

Pressurizing boot as third reciprocating pump means
The star 31 includes a pressure booster 31 and a plunger 33 that reciprocates in the booster 31 to periodically change the volume of the pump chamber 32.

The plunger 33 sucks the liquid into the pump chamber 32 by continuously moving in the direction of arrow A in the drawing (suction stroke), and conversely moves in the direction of arrow B to suck the liquid in the suction stroke. Discharge the liquid (discharging process). Further, the plunger 33 moves in the direction of arrow B to pressurize the liquid in the pump chamber 32 (pressurizing process) between the suction stroke and the discharge stroke, and moves in the direction of arrow A to move the plunger 33. returns to the position before the pressure stroke.

Press the plunger 33 of the pressure booster 31
In order to reciprocate by the screw shaft 13, the reversible servo motor 5 is controlled in the cylinder housing 41 so that the rotation direction is reversed by the servo control device 42.
No. 1 is attached, and a rotary nut 35 that is precisely screwed with the ball screw shaft 34 via the ball is provided on the housing 41.
Is rotatably supported at a fixed position of the
The rotary shaft of the rotor 51 and the rotary nut 35 are connected by a rotation transmission mechanism by a toothed endless belt 52.

The liquid is stored in the reservoir 16, and a suction port with a filter 18 as an inlet is provided in the reservoir 16.
Is open in the liquid. A first check valve 71 is provided in the supply passage 61 connecting the suction port 18 and the pump chamber 12A.
This check valve 71 opens the supply passage 61 so as to introduce the liquid sucked from the suction port 18 into the pump chamber 12A in the suction stroke of the plunger pump 10A, and at the discharge stroke of the plunger pump 10A. The discharge pressure closes the supply passage 61 to prevent the discharge liquid from the pump chamber 12A from flowing back to the reservoir 16.

On the downstream side where the liquid flows from the pump chamber 12A, there is a pressurizing treatment flow passage 62, to which the pump chambers 12B and 32 are connected. In the pressurization processing channel 62,
A second check valve 72 is provided, which is opened by pushing the liquid discharged from the plunger pump 10A. The check valve 72 is arranged in a direction that allows the liquid flow from the pump chamber 12A side to the pump chambers 12B and 32 side and blocks the reverse flow.

When the plungers 13A and 13B start moving in the direction of arrow B, the plunger pump 10A enters the suction stroke, and the movement of the plunger 13A causes the pump chamber 12A to move.
The liquid volume in the reservoir 16 self-sucks into the pump chamber 12A through the supply flow path 61 by gradually increasing the volume of the liquid. In this case, since the pump chamber 12A side has a negative pressure than the suction port 18 side, the first check valve 71 is opened, while the second check valve 72 is pumped more than the pressurization processing flow path 62 side. Since the chamber 12A side is under negative pressure, it remains closed. In this way, the plunger pump 10A has the reservoir 1
Since the liquid is self-sucked from 6, the liquid supply pump as in the prior art is not necessary, the liquid is not unnecessarily circulated, and the generation of bubbles and the change of the liquid chamber hardly occur.

When the plunger 13A reverses at the stroke end of the movement in the direction of arrow B and starts moving in the direction of arrow A, the plunger pump 10A enters the discharge stroke and the plunger 1
The volume of the pump chamber 12A is gradually reduced by the movement of 3A, so that the liquid in the pump chamber 12A is pressurized.
Discharge to 2. The liquid discharged from the pump chamber 12A is
The first check valve 71 is closed and the second check valve 72 is pushed open to be sent downstream. At this time, since the plunger pump 10B is in the suction stroke , the liquid is sucked into the pump chamber 12B. Further, since the servo control device 42 also controls the operation of the motor 51 , the pressurization booster 31 is synchronized with the plunger pump 10B in the suction stroke.
Also in the suction stroke, the liquid is sucked into the pump chamber 32.

The volume of the pump chamber 12A is the same as that of the pump chamber 12B.
Is substantially equal to the total volume of the pump chamber 32 and the volume of the liquid corresponding to the difference in volume between the pump chamber 12A and the pump chamber 12B is sucked into the pressurization booster 31.

Since the pump chambers 12B and 32 are connected to the pressurizing process flow passage 62 and are not provided with a check valve, when the liquid in the pump chamber 32 is pressurized by the pressurizing booster 31, the pump chambers 12B and 32 are pumped. Chamber 12B and pressure treatment flow path 62
The liquid is also pressurized in the same manner. The pump chambers 12B and 32 and the pressurization processing channel 62 integrally serve as a pressure container.

[0038] After the intake stroke enters the pressure stroke, Ka圧Bu - Star 31, the liquid pressurized to reach a pressure value set in advance, to retain only pressurized predetermined time. The plunger pumps 10A and 10B do not operate until the discharge stroke is entered. Further, the check valve 72 is arranged so as to prevent the reverse flow, and the valve 81 is closed, so that the pressure value fluctuates according to the operation of the pressure booster 31. The pressure value is detected by a pressure detector 82 provided at an appropriate position in the pressurization processing channel 62. The detection result is fed back to the servo control device 42, and the operation of the pressure booster 31 is controlled according to the change of the pressure value. In this way, the servo control device 42 controls the pressurization value and pressurization time suitable for the type of liquid to be pressurized and the purpose of pressurization.

The pressure detector 82 may be attached in the pump chamber 32 in addition to the pressurizing process flow passage 62. Further, when the relationship between the position of the plunger 33 and the liquid pressure value is known in advance. As an alternative to the pressure detector 82,
The position of the plunger 33 during the stroking motion is adjusted to the servo mode.
A position detector, such as a pulse encoder, for supplying the servo controller 42 of the motor 51 to the servo motor 51.
From the rotary output system to the plunger 33 and the ball screw shaft 3
It may be provided at an appropriate part up to the reciprocating part composed of four.

[0040] Once the pressure stroke is completed, the difference - servo control device 4
2 sends an actuation signal to the servo motor 51, so that the plunger 33 is actuated in the reverse direction to return the plunger 33. Therefore, the pressurized liquid is depressurized to the pressure value before pressurization. After that, the valve 81 is opened, and the servo pump 42 is further operated by the servo controller 42.
Both 0B and the pressure booster 31 enter the discharge stroke . The pump chamber 12 is pushed by the plungers 13B and 33.
The liquids of B and 32 and the pressurization processing channel 62 are discharged to the outside from the valve 81. If the valve 81 is controlled by the servo control device 42, for example, the plunger 13
The operation of B.33 and the operation of the valve 81 can be synchronized, and the productivity is improved.

[0041]

According to the invention described in claim 1, the structure of the apparatus can be simplified, the manufacturing cost of the apparatus can be reduced, and the maintenance of the apparatus becomes easy.

According to the second aspect of the present invention, the accuracy of the pressurization value of the pressurization processing device is improved, and the control of the pressure increasing curve is possible.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing the configuration of a liquid pressure treatment apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic explanatory diagram showing a configuration of a conventional liquid pressure treatment apparatus using a free piston pressure system.

[Explanation of symbols]

10A Plunger Pump (First Reciprocating Pump Means) 10B Plunger Pump (Second Reciprocating Pump Means) 11 Cylinder Housing 11A Liquid Supply Cylinder 11B High Pressure Treatment Cylinder 12A Liquid Supply Cylinder Pump Chamber 12B High Pressure Treatment Cylinder Pump Chamber 13 Precision ball screw shaft (drive member) 13A Plunger 13B for liquid supply cylinder Plunger for high pressure processing cylinder 14 Rotating nut 16 Reservoir 18 Suction port 21 Motor 22 Endless belt with teeth 31 Pressure booster 32 Pump Chamber of Pressurization Booster 33 Plunger of Pressurization Booster 34 Precision Ball Screw Shaft (Drive Member) 35 Rotating Nut 41 Cylinder Housing 42 Servo Controller 51 Servo Motor 52 Toothed Endless Belt 61 Supply flow path 62 Pressurization processing flow path 71 Check valve 72 Check valve 8 Valve 82 pressure detector

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shingo Yamagishi 2410 Motoe, Uozu-shi, Toyama Sugino Machine Co., Ltd. (56) Reference JP-A-3-18672 (JP, A) JP-B-52-2721 ( JP, B2) JP-B 4937924 (JP, B1) JP-B 50-23128 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04B 23/06 F04B 9/02

Claims (2)

(57) [Claims] 1. A first reciprocating pump for sucking and discharging a liquid.
Means, The discharge stroke when the first reciprocating pump means is in the suction stroke
On the contrary, the first reciprocating pump means is in the discharge stroke.
First reciprocating pump means so that the suction stroke occurs when
Liquid discharged from the first reciprocating pump means in conjunction with
Second reciprocating pump means for sucking in and discharging it to the outside, The first reciprocating pump means and the second reciprocating pump
Driven independently of the pump means,
The pressure of the inhaled liquid is increased for a predetermined time
And a third reciprocating pump means for returning after The capacity of the first reciprocating pump means is equal to that of the second reciprocating pump.
The total volume of the means and the third reciprocating pump means is substantially
Are configured to be equal, During the predetermined time, the first reciprocating pump hand
Step and the reciprocating motion of the second reciprocating pump means is temporarily stopped
LetAfter returning the third reciprocating pump means, the second reciprocating
The dynamic pump and the third reciprocating pump enter the discharge process
I did it, A liquid pressure treatment apparatus characterized by the above. 2. The first and second reciprocating pump means are driven by a motor via a converting means for converting a rotary motion into a linear reciprocating motion, and the third reciprocating pump means is a liquid pressure pump. The liquid pressure processing apparatus according to claim 1, wherein the liquid pressure processing apparatus is driven by a servo motor that operates according to a state.