JPH08338407A - Force feed device for fluid - Google Patents

Abstract

PURPOSE: To eliminate interrupted force feeding of a fluid and to prevent a vibration, by drive-controlling always either one of at least two force feed unit bodies in a force feed stroke in a condition of driving a force feed device of the fluid. CONSTITUTION: A part of a drive control device C is interposed between a force feed side pressure oil chamber 7a and a charging side pressure oil chamber 7b of each double acting hydraulic cylinder (force feed unit body) A, B and between a high pressure oil path 9 and a tank oil path 10, to control driving each hydraulic cylinder 7. Here is divided a force feed stroke total region L of each force feed unit body A, B in accordance with an inflow amount to control valves C1 , C2 into an initial region L1, end region L3 and an intermediate region L2. Force feed driving in the end region L3 of the unit body A and force feed driving in the initial region L1 of the unit body B are simultaneously performed, to complete driving in a charging stroke of the unit body A during the time of force feed driving the unit body B in the intermediate region L2. Force feed driving in the end region L3 of the unit body B and force feed driving in the initial region L1 of the unit body A are simultaneously performed, to complete a charging stroke of the unit body B during the time of force feed driving in the intermediate region L2 of the unit body A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-feeding device for fluids such as water, sewage, and various aqueous solutions, and more particularly to a pressure-feeding device provided with two reciprocating pressure-feeding units.

[0002]

2. Description of the Related Art A conventional pressure feeding device having two reciprocating pressure feeding units has a first pressure feeding unit A, as shown in FIG.
The second pumping unit B, and these two pumping units A,
And a drive control device C for controlling the drive of B. The first pressure feeding unit A is a cylinder 1, a piston 3 slidably fitted into the cylinder 1 to define a pump chamber 2 in the cylinder 1, the pump chamber 2 and a delivery passage 4.
And a delivery check valve 6a for allowing the flow of the fluid from the pump chamber 2 to the delivery passage 4 and for preventing the backflow, and is provided between the pump chamber 2 and the filling passage 5. In the filling check valve 6b that allows the flow of the fluid from the filling passage 5 to the pump chamber 2 and prevents the backflow, and in the pumping step that reduces the volume of the pump chamber 2 and the filling step that increases the volume, It is composed of a double-acting hydraulic Linder 7 that reciprocally drives the piston 3.

Reference numeral 7a denotes a pressure oil chamber on the pressure-feeding process side of the double-acting hydraulic cylinder 7 (oil chamber on the pressure-oil supplying side when the piston 3 of the pressure-feeding unit A is subjected to the pressure-feeding process), and 7b denotes pressure on the filling process side of the double-acting hydraulic cylinder 7. It is an oil chamber (oil chamber on the pressure oil supply side when the piston 3 of the pressure-feeding unit A is filled). S1 is the effective pressure receiving area of the pressure oil chamber 7a on the pressure feeding process side, and S2 is the pressure oil chamber 7 on the filling process side.
It is the effective pressure receiving area of b. S3 is an effective pressure receiving area of the piston 3 facing the pump chamber 2.

Reference numeral B is a second pressure-feeding unit body having the same structure as the first pressure-feeding unit body A, and the same parts are designated by the same reference numerals as those of the first pressure-feeding unit body A. However, the relation of the ratio of the effective pressure receiving areas S1, S2, S3 in the first pressure feeding unit body B is the same as that of the first pressure feeding unit body A. The delivery path 4 of the second pressure-feeding unit B is shared with the delivery path 4 of the first pressure-feeding unit A, and the fluids pumped from the pump chambers 2 and 2 of both the pressure-feeding units A and B are delivered. It is designed to be pumped to the path 4. In addition, the second pumping unit B
The filling passage 5 of the first pumping unit A is shared with the filling passage 5 of the first pumping unit A, and the fluid filled in the pump chambers 2 of the pumping units A and B is sucked and filled from the filling passage 5. It has become so. The filling passage 5 is connected to a tank (not shown) for the fluid to be pumped.

Filling process side pressure oil chambers 7b, 7b of the double-acting hydraulic cylinders 7, 7 of the respective pressure feeding units A, B are connected by a communication oil passage 11, and the pressure feeding unit A or B for one pressure feeding unit is connected. At the time of driving in the process, the other pumping unit B or A has an interlocking relationship so as to be driven in the filling process. In the communication oil passage 11, the filling process side pressure oil chambers 7b, 7b are provided.
A hydraulic oil amount control valve (not shown) for manually adjusting the hydraulic oil amount therein is attached.

The drive control device C includes pressure oil chambers 7a, 7a of the double-acting hydraulic cylinders 7, 7 on the pressure feeding process side, and a high pressure oil passage 9.
(The oil passage to which the pressure oil is supplied from the hydraulic pressure generator) and the tank oil passage 10 are provided.
Position for connecting the pressure oil chamber 7a of the second pressure feeding unit B to the high pressure oil passage 9 and the pressure oil chamber 7a of the second pressure feeding unit body B to the tank oil passage 10; A four-way two-position dedent type drive control capable of connecting the side pressure oil chamber 7a to the high pressure oil passage 9 and switching to the X position where the pressure feeding process side pressure oil chamber 7a of the first pressure feeding unit A is connected to the tank oil passage 10. The valve 12 and this drive control valve 12 are switched to the X position at the end of the pressure feeding process of the first pressure feeding unit body A (the end of the filling process of the second pressure feeding unit body B), and the pressure feeding process of the second pressure feeding unit body B is switched. At the end (the end of the filling process of the second pressure-feeding unit B), the switching means 13 is switched to the W position.

In this example, the switching means 13 is a rod 1 for transmitting the movement of the first pressure-feeding unit A to the outside of the double-acting hydraulic cylinder 7.
3a and the movement of the second pressure-feeding unit B are controlled by the double-acting hydraulic cylinder 7
It has a rod 13b for transmitting to the outside. Rod 13
A cam for switching the drive control valve 12 to the X position is attached to the outer end of a when the first pumping unit A reaches the end of the pumping process (right end in the drawing). When the second pressure-feeding unit B reaches the end of the pressure-feeding step (right end in the drawing) at the outer end of the rod 13b, the drive control valve 12 is turned to W.
A cam that switches to the position is installed. In addition, 1
4 is a first pumping unit A, a second pumping unit B, and
It is a valve that controls driving and stopping of a pressure feeding device including a drive control device C.

[0008]

A conventional fluid pressure-feeding device having such a structure has a characteristic that it can efficiently pressure-feed a fluid while having a simple structure, and has been widely used in recent years. However, the above-described conventional fluid pressure-feeding device has an interlocking relationship such that when one pressure-feeding unit A or B is driven in the pressure-feeding step, the other pressure-feeding unit B or A is driven in the filling step. Has become
There is a problem that the pressure feeding of the fluid to the delivery passage 4 is unavoidably stopped at the end of the process of the pressure feeding units A and B, and the fluid is intermittently fed to the delivery passage 4. The intermittent pumping of the fluid causes a problem that not only the pumping device but also the delivery passage holding mechanism that holds the delivery passage 4 is greatly vibrated.

An object of the present invention is to provide a novel pumping device which solves the above-mentioned problems of a fluid pumping device having two reciprocating pumping units.

[0010]

In order to achieve the above-mentioned object, the fluid pumping apparatus of the present invention includes a drive control device C portion in the above-mentioned conventional pumping apparatus, in which each double-acting hydraulic cylinder A,
B of the double-acting hydraulic cylinders 7 and 7 installed between the pressure oil chambers 7a and 7a of B, the pressure oil chambers 7b and 7b of the same filling process, the high pressure oil passage 9 and the tank oil passage 10. A drive control device C for controlling drive, comprising:
When the entire pressure-feeding process region L of B is divided into a pressure-feeding process initial region L1, a pressure-feeding process end region L3, and a pressure-feeding process intermediate region L2 between these pressure-feeding process initial region L1 and pressure-feeding process end region L3,
The pressure feeding drive of the first pressure feeding unit A in the final stage L3 of the pressure feeding process and the pressure feeding driving of the second pressure feeding unit B in the initial region L1 of the pressure feeding process are simultaneously performed, and the second pressure feeding unit B is pressure fed in the intermediate region L2 of the pressure feeding process. While being driven, the filling drive of the first pumping unit A in the entire filling process is completed, and the pumping drive of the second pumping unit B in the final stage L3 of the pumping process and the initial region of the first pumping unit A in the pumping process are completed. L
1 is configured such that the pressure-feeding drive in 1 is performed simultaneously, and the filling drive in the entire filling process of the second pressure-feeding unit B is completed while the first pumping unit A is pressure-driven in the intermediate pressure-feeding region L2. This is the device C.

[0011]

In the fluid pressure-feeding device constructed as described above, at least one of the pressure-feeding units A or B is always driven in the pressure-feeding step when the fluid-feeding device is driven. It is possible to continuously carry out the pressure feeding to No. 4 without interruption.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a fluid pressure-feeding device of the present invention will be described below with reference to FIGS. The pressure feeding device of the present invention is characterized by the configuration of the drive control device C that controls the driving of the double-acting hydraulic cylinders 7, 7 of the first and second pressure feeding units A and B, as compared with the above-described conventional pressure feeding device. Therefore, the description of the above-described conventional pressure feeding device will be cited below for the configuration other than the drive control device C.

A first embodiment of a fluid pumping apparatus according to the present invention will be described with reference to FIGS. 1 to 8. As shown in FIG. 1, the drive control device C of the pressure feeding device of the present invention is a first control valve for controlling the supply / discharge of hydraulic oil to / from the pressure feeding process side pressure oil chambers 7a, 7a of the double-acting hydraulic cylinders 7, 7. Means C1, second control valve means C2 for controlling supply and discharge of hydraulic oil to and from the filling process side pressure oil chambers 7b, 7b of the double-acting hydraulic cylinders 7, 7, the first control valve means C1 and the second control valve means C2. It is configured with a switching mechanism C3 that controls switching of the control valve means C2.

The first control means C1 includes pressure oil chambers 7a and 7a of the double-acting hydraulic cylinders 7 and 7 of the first and second pressure feeding units A and B, the pressure oil chambers 7a and 7a, the high pressure oil passage 9, and the tank oil. The double-acting hydraulic cylinder 7 in the first pressure-feeding unit A is connected to the high-pressure oil passage 9 while the double-acting hydraulic cylinder 7 in the first pressure-feeding unit A is connected to the high-pressure oil passage 9. The first state I in which the process side pressure oil chamber 7a is connected to the tank oil passage 10 and the pressure feeding of the double-acting hydraulic cylinder 7 in the second pressure feeding unit B are connected to the high pressure oil passage 9 and the first pressure feeding. The second state II in which the pressure-feeding process side pressure oil chamber 7a of the double-acting hydraulic cylinder 7 in the unit body A is connected to the tank oil passage 10, and the double-acting hydraulic cylinders 7, 7 in the first and second pressure-feeding unit bodies A, B Each pressure feeding process side pressure chamber 7a,
7a can be switched to a third state III in which the high pressure oil passage 9 is connected. In this example, the first control valve means C1
The first state I and the second state II on both sides,
This is a spring center type four-way three-position type switching valve having the third state III in the neutral position, and is switched and controlled by two solenoids.

The second control valve means C2 includes the filling process side pressure oil chambers 7b and 7b of the double-acting hydraulic cylinders 7 and 7 of the first and second pressure feeding units A and B, the high pressure oil passage 9 and the tank. The pressure oil chambers 7b, 7b, which are interposed between the oil passages 10 and are provided in the filling process side
And a first state I which is connected to the high pressure oil passage 9 and
It is configured such that the filling process side pressure oil chambers 7b, 7b of the double-acting hydraulic cylinders 7, 7 in the first and second pressure feeding units A, B can be switched to a second state II in which they are connected to the tank oil passage 10. In this example, the second control valve means C2 is a two-position switching valve offset to the second state II by a spring, and is switched and controlled by one solenoid.

The entire pressure-feeding process area L of the first and second pressure-feeding units A and B is used for the purpose of switching control of the first control valve means C1 and the second control valve means C2.
1, the final stage L3 of the pressure-feeding process, and the intermediate region L2 between the pressure-feeding process initial region L1 and the pressure-feeding process end region L3. Since each of the pressure-feeding units A and B is reciprocally driven in the pressure-feeding process and the filling process, the entire pressure-feeding process region L corresponds to the entire filling process. Figure 2
The relationship is shown in. In FIG. 2, for convenience of description, the pressure feeding process L and the filling process L of the pressure feeding unit bodies A and B that are reciprocally driven are expanded and shown. The switching mechanism C3 detects the case where the first pressure-feeding unit A is in the pressure-feeding process intermediate region L2 (region indicated by a thick solid line in FIG. 2) (pressure-feeding process end region L3, filling process entire region, and pressure-feeding process initial region L1). The detection means C3a for detecting the case (in case of 1) and the case where the second pressure-feeding unit B is in the pressure-feeding process intermediate region L2 (region indicated by a thick solid line in FIG. 2) are detected (pressure-feeding process end region L3, filling process). The detection means C3b that does not detect the case of being in the entire region and the initial region L1 of the pressure-feeding process) and the detection signals from these detection means C3a and C3b, and sends a switching signal to the first and second control valve means C1 and C2. Switching signal output section C3c for outputting
It consists of and.

FIG. 3 shows the first and second detecting means C3a and C3b for detecting the case where the respective pressure-feeding units A and B are in the intermediate area L2 of the pressure-feeding process, and the detection signals from these detecting means C3a and C3b. And a switching signal output section C3 for outputting a switching signal to the second control valve means C1 and C2.
The specific example of c is shown.

In the detecting means C3a, the first pressure-feeding unit A has a pressure-feeding process intermediate region L2 (region shown by a thick solid line in FIG. 2).
Also, the limit switch C3a1, which is turned on when located in the filling process intermediate region L2 (region indicated by the thick dotted line in FIG. 2), and the first pressure feeding unit A slightly enter the pressure feeding process starting end and the pressure feeding process intermediate region L2. The area between the front and back (Fig. 2
In the area indicated by the solid line frame) and the first pumping unit A in the area between before the end of the filling process intermediate area and the end of the filling process (area indicated by the dotted line frame in FIG. 2) are turned on. It is turned off when the switch C3a2 and the first pumping unit A are located at the end of the pumping process (the region shown by the thin solid line in FIG. 2) and the beginning of the filling process (the region shown by the thin dotted line in FIG. 2). A limit switch C3a3 is provided. These limit switches C3a1, C3
a2, C3a3, for example, a cam (not shown) arranged on a rod mounted so as to transmit the movement of the first pressure-feeding unit A to the outside of the double-acting hydraulic cylinder 7 in association with the cam.

C3a4 is an AND element that outputs an electric signal to the switching signal output section C3c when both of its input sections are energized. The limit switch C3a1 is interposed in a path for energizing one input portion of the AND element C3a4. In the path for energizing the other input portion of the AND element C3a4, a normally closed type limit switch C that is turned off in conjunction with the ON operation of the limit switch C3a1 is provided.
3a5 and the limit switch C3a2 are provided in series, and a self-holding circuit C3a6 that self-holds energization to the other input part of the AND element C3a4 is provided in parallel across the limit switch C3a5 and the limit switch C3a2. ing. The self-holding circuit C3a6 is
A relay C3a7 that operates by energizing the other input portion of the AND element C3a4 and a relay C3a that is interposed in a circuit that bypasses the limit switches C3a5 and C3a2.
It is composed of a relay switch C3a8 which is turned on when 7 is operated. Detecting means C3a configured in this way
Indicates that an electric signal is output from the AND element C3a4 only when the first pressure-feeding unit A is in the pressure-feeding process intermediate region L2 (region indicated by a thick solid line in FIG. 2).

In the detecting means C3b, the second pressure-feeding unit B has a pressure-feeding process intermediate region L1 (region shown by a thick solid line in FIG. 2).
Also, the limit switch C3b1, which is turned on when located in the filling process intermediate region L1 (region indicated by the thick dotted line in FIG. 2), and the second pressure feeding unit body B slightly enter the pressure feeding process starting end and the pressure feeding process intermediate region L2. The area between the front and back (Fig. 2
In the area indicated by the solid line frame) and the second pumping unit B in the area between the end of the intermediate step of the filling step and the end of the filling step (the area indicated by the dotted line frame in FIG. 2) are turned on. The switch C3b2 and the second pressure-feeding unit B are turned off when they are located at the end of the pressure-feeding process (the region indicated by the thin solid line in FIG. 2) and the beginning of the filling process (the region indicated by the thin dotted line in FIG. 2). A limit switch C3b3 is provided. These limit switches C3b1, C3
b2, C3b3, for example, is attached in association with a cam (not shown) arranged on a rod attached so as to transmit the movement of the second pressure-feeding unit B to the outside of the double-acting hydraulic cylinder 7.

C3b4 is an AND element which outputs an electric signal to the switching signal output section C3c when both input sections are energized. The limit switch C3b1 is provided in a path for energizing one input portion of the AND element C3b4. A normally closed limit switch C that is turned off in conjunction with the ON operation of the limit switch C3b1 is provided in the path for energizing the other input portion of the AND element C3b4.
3b5 and the limit switch C3b2 are provided in series, and a self-holding circuit C3b6 that self-holds the energization to the other input part of the AND element C3b4 is provided in parallel across the limit switch C3b5 and the limit switch C3b2. ing. The self-holding circuit C3b6 is
A relay C3b7 that operates by energizing the other input of the AND element C3b4 and a relay C3b that is interposed in a circuit that bypasses the limit switches C3b5 and C3b2.
The relay switch C3b8 is turned on when the switch 7 operates. The detecting means C3b configured as described above
Indicates that an electric signal is output from the AND element C3b4 only when the second pressure-feeding unit B is in the pressure-feeding process intermediate region L2 (region indicated by a thick solid line in FIG. 2).

The switching signal output section C3c has a detecting means C.
When 3a detects that the first pressure-feeding unit A is in the pressure-feeding process intermediate region L2, the AND element C of the detection means C3a.
Receiving an electric signal from 3a4, the first control valve means C1
Is switched to the first state I, and the second control valve means C2
To generate a signal h for switching the first state I to the first state I (a solenoid energizing the first control valve means C1 to the first state I and a second energization signal to the solenoid to switch the second control valve means C2 to the first state I). Outputting and detecting means C3
When it is detected that b is in the pressure-feeding process intermediate region L2 of the second pressure-feeding unit B, the II element C3 of the detection means C3b.
A signal i for switching the first control valve means C1 to the second state II and the second control valve means C2 to the first state I by receiving the electric signal from b4 (the first control valve means C1 to the second state II) A solenoid for switching to the state II and the solenoid for switching the second control valve means C2 to the first state I) are generated and output.

In FIG. 1, reference numeral 15 indicates that one of the pressure-feeding units A or B is set at the end of the pressure-feeding process in advance and the other pressure-feeding unit B is driven before driving the fluid pressure-feeding device.
Alternatively, it is a drive preparation means for positioning A at the starting end of the pressure feeding process. This drive preparation means 15 is, as shown in FIG.
A switch means 18 composed of a normally closed type switch 16 for cutting off the h signal path from the switching signal output section C3c and a normally open type switch 17 for connecting the i signal path to a power source when the switch 16 is cut off. , Switching signal output section C3c
Normally closed switch 19 for shutting off the i signal path from
And a switch means 21 composed of a normally open switch 20 for connecting the h signal path to a power source when the switch 19 is cut off.

When the switch means 21 is operated, the first control valve means C1 is switched to the first state I and the second control valve means C2 is switched to the first state I. Therefore, the first pumping unit A is driven to the end of the pumping process, and the second pumping unit B is driven to the beginning of the pumping process. When the switch means 18 is operated, the first control valve means C1 is switched to the second state II and the second control valve means C2 is set to the first state.
Switch to state I. Therefore, the second pumping unit B is driven to the end of the pumping process and the first pumping unit A is driven to the beginning of the pumping process.

Reference numeral 22 denotes a low-pressure relief valve (the relief setting pressure is set to the first and second pressure feeding unit A) provided in the communication passage 11 connecting the filling process side pressure oil chambers 7b of the double-acting hydraulic cylinders 7. , B is a relief valve set to a necessary and sufficient value for driving the filling.

The operation of the above embodiment will be described below. When driving the pressure feeding device, first, the valve 14 for controlling the driving and stopping of the pressure feeding device is operated to supply the pressure oil to the high pressure oil passages 9 and 9 to the first control valve means C1 and the second control valve means C2. At the same time, the switch means 18 of the drive preparation means 15 is operated to bring the second pressure-feeding unit body B to the end of the pressure-feeding process and the first pressure-feeding unit A to the start end of the pressure-feeding process. Of course, when the driving positional relationship between the first and second pressure-feeding units A and B maintains a predetermined relationship during driving, the driving preparation means 15
However, in the following description, it is assumed that the driving is started when the first pumping unit A is located at the beginning of the pumping process and the second pumping unit B is located at the end of the pumping process.

0. A state in which the first pumping unit A is located at the beginning of the pumping process and the second pumping unit B is located at the end of the pumping process. This state is shown in FIG. (Connection state of the first control valve means C1 and the second control valve means C2) Neither the signal h nor the signal i is output from the switching signal output portion C3c in the switching mechanism C3. Therefore, the first control valve means C1 is in the neutral state, that is, the third state III,
The second control valve means C2 is in the second state II. (Operation of each pressure feeding unit A, B) Pressure oil is supplied to the pressure feeding process side pressure oil chamber 7a of each double acting hydraulic cylinder 7 of both pressure feeding unit A, B via the first control valve means C1. At the same time, the pressure oil is discharged from the filling process side pressure oil chamber 7b of the double-acting hydraulic cylinders 7 of both the pressure feeding units A and B via the second control valve means C2. Therefore, the first and second pumping unit bodies A,
Both B are pumped and driven. However, since the second pressure-feeding unit B is located at the end of the pressure-feeding process, it is stopped. The fluid to be pumped is sent from the first pumping unit A.

1. The first pressure-feeding unit A is the intermediate region L of the pressure-feeding process.
The state of being driven by pressure feeding at 2. This state is shown in FIG. (Connection state of the first control valve means C1 and the second control valve means C2) When the first pressure-feeding unit A enters the pressure-feeding process intermediate region L2, the switching mechanism C3 outputs the h signal. Therefore, the first control valve means C1 is switched to the first state I and the second control valve means C2 is switched to the first state I. (Operation of each pressure feeding unit A, B) The pressure oil is supplied to the pressure feeding process side pressure oil chamber 7a of the double-acting hydraulic cylinder 7 of the first pressure feeding unit A via the first control valve means C1. The hydraulic oil is discharged from the pressure-feeding process side oil chamber 7a of the double-acting hydraulic cylinder 7 of the second pressure-feeding unit B. On the other hand, the pressure oil is supplied to the filling process side pressure oil chambers 7b, 7b of the double-acting hydraulic cylinders of the two pressure feeding units A and B via the second control valve means C2. Therefore, the first pressure-feeding unit body A continues the pressure-feeding drive, and the second pressure-feeding unit body B is charged and driven. In this case, in the filling process side pressure oil chamber 7b of the double-acting hydraulic cylinder 7 of the second pressure feeding unit B,
Outflow oil from the filling process side pressure oil chamber 7b of the double-acting hydraulic cylinder 7 of the first pressure-feeding unit A (outflow oil that flows out when the first pressure-feeding unit A is pressure-driven) and from the second control valve means C2. Since the first pressure feeding unit body A is pressure-driven in the pressure feeding process intermediate region L2, the second pressure feeding unit body B completes the filling driving of the entire filling process (this is the case). Flow rate of the pressure oil passing through the second control valve means C2 is set in advance). (Sending of fluid to be pumped) Fluid to be pumped is
It is delivered from the first pressure-feeding unit A.

2. The first pumping unit A is the final stage L of the pumping process
The state of entering No. 3 (the first pumping unit A is the pumping process intermediate region L
2 has passed). This state is shown in FIG. (Connection state of the first control valve means C1 and the second control valve means C2) When the first pressure-feeding unit A passes through the pressure-feeding process intermediate region L2 and enters the pressure-feeding process end region, the switching signal output section C3c of the switching mechanism C3 outputs Does not output both the signal h and the signal i. Therefore, the first control valve means C1 is in the neutral state, that is, the third state III, and the second control valve means C2 is in the second state II. (Operation of each pressure-feeding unit A, B) Pressure oil is supplied to the pressure-feeding process side pressure oil chamber 7a of each double-acting hydraulic cylinder 7 of both pressure-feeding unit A, B via the first control valve means C1. At the same time, the hydraulic oil is discharged from the filling process side pressure oil chamber 7b of the double-acting hydraulic cylinders 7 of both the pressure feeding units A and B via the second control valve means C2. Therefore, the first and second pumping unit bodies A,
Both B are pumped and driven. This pressure feeding drive continues until the second pressure feeding unit B reaches the pressure feeding process intermediate region. (Sending of fluid to be pumped) Fluid to be pumped is
It is delivered from the first and second pressure-feeding units A and B.

3. The second pressure-feeding unit B is in the intermediate region L of the pressure-feeding process.
The state of being driven by pressure feeding at 2 (the connected state of the first control valve means C1 and the second control valve means C2). This state is shown in FIG. (Connection state of the first control valve means C1 and the second control valve means C2) When the second pressure-feeding unit B enters the pressure-feeding process intermediate region L2, the switching mechanism C3 outputs an i signal. Therefore, the first control valve means C1 is switched to the second state II and the second control valve means C2 is switched to the first state I. (Operation of each pressure feeding unit A, B) The pressure oil is supplied to the pressure feeding process side pressure oil chamber 7a of the double-acting hydraulic cylinder 7 of the second pressure feeding unit B via the first control valve means C1. The hydraulic oil is discharged from the pressure-feeding process side oil chamber 7a of the double-acting hydraulic cylinder 7 of the first pressure-feeding unit A. On the other hand, the pressure oil is supplied to the filling process side pressure oil chambers 7b, 7b of the double-acting hydraulic cylinders of the two pressure feeding units A and B via the second control valve means C2. Therefore, the second pressure feeding unit body B continues the pressure feeding drive, and the first pressure feeding unit body A is charged and driven. In this case, in the filling process side pressure oil chamber 7b of the double-acting hydraulic cylinder 7 of the first pressure feeding unit A,
Outflow oil from the filling process side pressure oil chamber 7b of the double-acting hydraulic cylinder 7 of the second pressure-feeding unit body B (outflow oil that flows out along with the pressure-feeding drive of the second pressure-feeding unit body B) and from the second control valve means C2. Since the second pressure feeding unit B is pressure-fed in the pressure feeding step intermediate region L2, the first pressure feeding unit A completes the filling driving of the entire filling step. (The flow rate of the pressure oil passing through the second control valve means C2 is set in advance so as to do so.) (Sending of the fluid to be pumped) The fluid to be pumped is
It is sent from the second pressure-feeding unit B.

4. The second pumping unit B is in the final stage L of the pumping process.
3 state (the second pressure-feeding unit B is in the pressure-feeding process intermediate region L
2 has passed). This state is shown in FIG. (Connection state of the first control valve means C1 and the second control valve means C2) When the second pressure feeding unit body B passes the pressure feeding process intermediate region L2 and enters the pressure feeding process final region, from the switching signal output portion C3c in the switching mechanism C3. Does not output both the signal h and the signal i. Therefore, the first control valve means C1 is in the neutral state, that is, the third state III, and the second control valve means C2 is in the second state II. (Operation of each pressure-feeding unit A, B) Pressure oil is supplied to the pressure-feeding process side pressure oil chamber 7a of each double-acting hydraulic cylinder 7 of both pressure-feeding unit A, B via the first control valve means C1. At the same time, the hydraulic oil is discharged from the filling process side pressure oil chamber 7b of the double-acting hydraulic cylinders 7 of both the pressure feeding units A and B via the second control valve means C2. Therefore, the first and second pumping unit bodies A,
Both B are pumped and driven. This pressure feeding drive continues until the first pressure feeding unit A reaches the intermediate region of the pressure feeding process. (Sending of fluid to be pumped) Fluid to be pumped is
It is delivered from the first and second pressure-feeding units A and B.

In the following, the above steps 1 to 4 are continuously driven as one cycle. In each of these steps 1 to 4, the fluid to be pumped is always pumped to the pumping path 4, and the fluid can be continuously pumped from the pumping device. In particular, in the case of the above-described embodiment, since the pressure oil from the common hydraulic source is used as the pressure oil for driving the first and second pressure feeding units A and B, both pressure feeding units A and B are The effect that the amount of fluid per unit time that is pumped from the pumping device can be maintained substantially the same whether the pumping units are driven together or only one of the pumping units A or B is pumped. There is also.

The above-mentioned embodiment relates to a fluid pressure-feeding device according to claim 2, which is a specific example of the drive device according to claim 1.

In the above embodiment, the drive controller C
The double-acting hydraulic cylinders 7, 7 in the pressure feeding chamber 7
First control valve means C for controlling supply and discharge of hydraulic oil to and from a and 7a
1 and the filling process side pressure oil chamber 7 of each double-acting hydraulic cylinder 7, 7.
Second control valve means C for controlling the supply and discharge of hydraulic oil to and from b and 7b
2 and a switching mechanism C3 for switching and controlling the first control valve means C1 and the second control valve means C2, and these control valve means C1, C2 and the switching mechanism C3 are as follows. I am configuring. C1. (First control valve means) Pressure oil chambers 7a, 7a on the pressure-feeding process side of the double-acting hydraulic cylinders 7, 7 of the first and second pressure-feeding units A, B, the high-pressure oil passage 9, and the tank oil passage 10 Connected to the high pressure oil passage 9 of the double-acting hydraulic cylinder 7 of the double-acting hydraulic cylinder 7 in the first pressure-feeding unit A, and the pressure-feeding process-side pressure oil of the double-acting hydraulic cylinder 7 in the second pressure-feeding unit B. A first state in which the chamber 7a is connected to the tank oil passage 10 and a second pressure-feeding unit B
Connecting the pressure-feeding process side pressure oil chamber 7a of the double-acting hydraulic cylinder 7 to the high-pressure oil passage 9 and connecting the pressure-feeding process side pressure oil chamber 7a of the double-acting hydraulic cylinder 7 of the first pressure-feeding unit A to the tank oil passage 10. It is possible to switch between the second state and the third state in which the pressure-feeding process side pressure oil chambers 7a, 7a of the double-acting hydraulic cylinders 7, 7 in the first and second pressure-feeding units A, B are connected to the high-pressure oil passage 9. One control valve means C1, C2. (Second control valve means) Between the filling process side pressure oil chambers 7b and 7b of the double-acting hydraulic cylinders 7 and 7 of the first and second pressure feeding units A and B, the high pressure oil passage 9 and the tank oil passage 10. Of the double-acting hydraulic cylinders 7 and 7 in the first and second pressure-feeding units A and B, which are connected to the high-pressure oil passage 9 and communicate with the pressure-oil chambers 7b and 7b on the filling process side. Each filling process side pressure oil chamber 7
b, 7b are connected to the tank oil passage 10, the second control valve means C2, C3. (Switching mechanism) The first control valve means is switched to the third state and the second control valve means is switched to the second state in the final region of the pressure feeding process of the first pressure feeding unit body A, and the middle of the pressure feeding process of the second pressure feeding unit body B is performed. In the zone, the first control valve means is switched to the second state, the second control valve means is switched to the first state, and the first control valve means is switched to the third state in the final stage of the pressure feeding process of the second pressure feeding unit B. At the same time, the second control valve means is switched to the second state, the first control valve means is switched to the first state and the second control valve means is switched to the first state in the intermediate region of the pressure feeding process of the first pressure feeding unit A. Switching mechanism C3,

However, the second control valve means C2 in the above embodiment may be constructed as shown in FIG. That is, the second control valve means C2 and the communication passage 11 connecting the filling process side pressure oil chambers 7b, 7b of the double-acting hydraulic cylinders 7, 7 of the first and second pressure feeding units A, B, respectively. A switching valve C2a which is interposed between the high-pressure oil passage 9 and connected to the first state I and a second state II in which the both are disconnected, and a low-pressure relief valve attached to the communication passage 11 (the relief valve thereof is provided). The set pressure may be configured by a relief valve 22 set to a value necessary and sufficient for filling and driving the first and second pressure feeding units A and B. In this case, the switching valve C2a may be switched between the first state I and the second state II in the same manner as that of the second control valve means in the above embodiment. In the case of this embodiment, it is included in the fluid pumping device according to claim 2 which is a specific example of the drive device according to claim 1.

Further, the second control valve means C2 in the above-mentioned embodiment, as shown in FIG. 10, is the pressure oil on the filling process side of the double-acting hydraulic cylinders 7, 7 of the first and second pressure-feeding units A, B. A pressure assurance valve 23 for supplying a limited pressure from the high-pressure oil passage 9 to the communication passage 11 connecting the chambers 7b, 7b.
A low-pressure relief valve (relief valve whose relief setting pressure is set to a value necessary to drive the first and second pressure-feeding units A and B for filling) may be configured by being attached to the communication passage 11. In this case, the guaranteed pressure of the pressure guarantee valve 23 is slightly lower than the set pressure of the low pressure relief valve 22 (however, this pressure is necessary and sufficient to drive the first and second pressure feeding units A and B for filling. Value). In the case of this embodiment, it is not included in claim 2 but included in claim 1.

In any case, the drive control device C constituting the characteristic portion of the fluid pumping device of the present invention is not limited to the above embodiment. That is, the drive controller C
The pressure oil chamber 7a, the pressure oil chamber 7b for the filling process, the high pressure oil passage 9, and the tank oil passage 10 of each double-acting hydraulic cylinder.
And a drive control device which is interposed between the pressure-feeding units A and B and controls the drive of each double-acting hydraulic cylinder 7.
Of the entire pressure feeding process, the pressure feeding process initial region L1, the pressure feeding process end region L3, and these pressure feeding process initial region L1 and end period L3.
When partitioning into the intermediate region L2 of the pressure-feeding process between, the pressure-feeding driving of the first pressure-feeding unit body A in the last region L3 of the pressure-feeding process and the second pumping unit B in the initial region L1 of the pressure-feeding process are simultaneously performed, While the pressure-feeding unit B is pressure-driven in the pressure-feeding process intermediate region L2, the filling drive of the first pressure-feeding unit A in the entire filling process is completed, and the pressure-feeding drive of the second pressure-feeding unit B in the pressure-feeding process end region L3. And the first pumping unit A in the pumping process initial region L1 are simultaneously driven, and the second pumping unit B is filled while the first pumping unit A is pumped in the pumping process intermediate region L2. It is only necessary to drive and control the first and second pressure feeding units A and B so that the filling drive in the entire region is completed, and various changes can be made within that range.

[0038]

The fluid pressure-feeding device of the present invention configured and operated as described above is a fluid pressure-feeding device of a simple structure having two reciprocating pressure-feeding unit bodies, Therefore, it is possible to continuously pressure-feed without interruption.

[Brief description of drawings]

FIG. 1 is an explanatory view of a fluid pressure-feeding device of the present invention.

FIG. 2 is an explanatory diagram of a pressure feeding process region and a filling process region of each pressure feeding unit body A, B in the fluid pressure feeding device of the present invention.

FIG. 3 is an explanatory diagram of an example of a switching mechanism C3.

FIG. 4 is an explanatory diagram of drive preparation means 15.

FIG. 5 is an explanatory diagram showing a starting preparation state of the fluid pressure-feeding device of the present invention.

FIG. 6 is an explanatory diagram showing a state of a driving process following FIG.

FIG. 7 is an explanatory diagram showing a state of a driving process following FIG.

8 is a state of a driving process following FIG. 7, and FIG.
FIG. 6 is an explanatory diagram showing a state of a driving process prior to FIG.

FIG. 9 is an explanatory diagram of another embodiment.

FIG. 10 is an explanatory diagram of another embodiment.

FIG. 11 is an explanatory diagram of a conventional fluid pressure-feeding device.

[Explanation of symbols]

A: first pressure feed unit, B: second pressure feed unit, 1; cylinder, 2; pump chamber, 3; piston, 4; delivery passage, 5; filling passage, 6a; pressure check valve, 6b; filling Check valve, 7;
Double-acting hydraulic cylinder, 7a; pressure oil chamber on pressure-feeding process side, 7b; pressure oil chamber on filling process side, S1; effective pressure receiving area of pressure oil chamber 7a on pressure feeding process side, S2; effective pressure receiving area on pressure oil chamber 7b of filling process side,
S3: effective pressure receiving area of the piston 3, C: drive control device,
9; high pressure oil passage, 10; tank oil passage, 11; communication oil passage,
(12; drive control valve, 13; switching means, 13a, 13
b; rod, ... Conventional example) 14; valve, C1; first control valve means, I; first switching state (of C1), II; second (of C1)
Switching state, III; third switching state (of C1), C2; second control valve means, I; first switching state of (C2), II; (C2
Second) switching state, C3; switching mechanism, C3a, C3b;
Detecting means, C3a1; limit switch, C3a2; limit switch, C3a3; limit switch, C3a
4; AND element, C3a5; Limit switch, C3a
6; holding circuit, C3a7; relay, C3a8; relay switch, C3b1; limit switch, C3b2; limit switch, C3b3; limit switch, C3b
4; AND element, C3b5; Limit switch, C3b
6; holding circuit, C3b7; relay, C3b8; relay switch, C3c; switching signal output section, h, i; switching signal,
L: entire pressure-feeding process, L1; initial region of pressure-feeding process, L2: intermediate region of pressure-feeding process, L3: final region of pressure-feeding process, 15; drive preparation means, 16; normally closed switch, 17; normally open switch, 1
8; switch means, 19; normally closed type switch, 20; normally open type switch, 21; switch means, 22; low pressure relief valve, C2a; switching valve, 23; pressure assurance valve,

Claims (2)

[Claims] 1. A fluid pumping device comprising the following A to C. A. (First pressure feeding unit) Cylinder 1, piston 3 which is slidably fitted in the cylinder 1 to define a pump chamber 2 in the cylinder 1, and is interposed between the pump chamber 2 and the delivery passage 4. Pump room 2
Check valve 6a for allowing the flow of the fluid from the discharge passage 4 to the discharge passage 4 and preventing the reverse flow, and the flow from the filling passage 5 to the pump chamber 2 by being interposed between the pump chamber 2 and the filling passage 5. A check valve for filling 6b that allows the flow of the body and blocks the backflow, and a double-acting hydraulic cylinder 7 that reciprocally drives the piston 3 in a pumping step that reduces the volume of the pump chamber 2 and a filling step that increases the volume. A first pressure-feeding unit A including: B. (Second pressure feeding unit) A second pressure feeding unit B having the same configuration as the first pressure feeding unit A, in which the effective pressure receiving area S1 of the pressure feeding process side pressure oil chamber 7a of the double-acting hydraulic cylinder 7 and the filling process side pressure. The ratio of the effective pressure receiving area S2 of the oil chamber 7b and the effective pressure receiving area S3 of the piston 3 facing the pump chamber 2 is set to be the same as that of the first pressure feeding unit A, and its delivery path 4 is the first pressure feeding unit. The second pressure-feeding unit B configured to be shared with the delivery path 4 of FIG. C. (Drive Control Device for Double-acting Hydraulic Cylinder in First and Second Pressure-feeding Units) Pressure-feeding process side pressure oil chamber 7a of each double-acting hydraulic cylinder A, B, filling process side pressure oil chamber 7b, high-pressure oil passage 9, and A drive control device C that is interposed between the tank oil passage 10 and controls the drive of each double-acting hydraulic cylinder 7. When the zone L1, the pressure-feeding process end zone L3, and the pressure-feeding process intermediate zone L2 between these pressure-feeding step initial zone L1 and pressure-feeding step end zone L3 are divided, The pressure-feeding driving initial region L1 of the second pressure-feeding unit body B is simultaneously driven, and the second pressure-feeding unit body B is pressure-driven in the pressure-feeding process intermediate region L2. Of the second filling unit B after the filling drive of The pressure feeding drive of the period L3 and the pressure feeding drive of the first pressure feeding unit A in the pressure feeding process initial region L1 are simultaneously performed, and the second pressure feeding is performed while the pressure feeding drive of the first pressure feeding unit a is performed in the pressure feeding process intermediate region L2. A drive control device C configured to complete the filling drive of the entire unit body B filling process. 2. A drive control device C for controlling the drive of the double-acting hydraulic cylinders 7, 7 of the first and second pressure-feeding units A, B.
The double-acting hydraulic cylinders 7, 7 in the pressure feeding chamber 7
First control valve means C for controlling supply and discharge of hydraulic oil to and from a and 7a
1 and the filling process side pressure oil chamber 7 of each double-acting hydraulic cylinder 7, 7.
Second control valve means C for controlling the supply and discharge of hydraulic oil to and from b and 7b
2 and a switching mechanism C3 for switching and controlling the first control valve means C1 and the second control valve means C2, and these control valve means C1, C2 and the switching mechanism C3 are as follows. The fluid pressure-feeding device according to claim 1, which is configured. C1. (First control valve means) Pressure oil chambers 7a, 7a on the pressure-feeding process side of the double-acting hydraulic cylinders 7, 7 of the first and second pressure-feeding units A, B, the high-pressure oil passage 9, and the tank oil passage 10 Connected to the high pressure oil passage 9 of the double-acting hydraulic cylinder 7 of the double-acting hydraulic cylinder 7 in the first pressure-feeding unit A, and the pressure-feeding process-side pressure oil of the double-acting hydraulic cylinder 7 in the second pressure-feeding unit B. The first state I connecting the chamber 7a to the tank oil passage 10 and the pressure-feeding process side pressure oil chamber 7a of the double-acting hydraulic cylinder 7 in the second pressure-feeding unit B.
Is connected to the high-pressure oil passage 9 and the pressure-feeding process side pressure oil chamber 7a of the double-acting hydraulic cylinder 7 in the first pressure-feeding unit A is connected to the tank oil passage 10, and the first and second pressure-feeding units are connected. The first control valve means C1, C2. A that can switch the pressure oil chambers 7a, 7a of the double-acting hydraulic cylinders 7, 7 in A and B to the third state III in which the pressure oil chambers 7a, 7a are connected to the high pressure oil passage 9. (Second control valve means) Between the filling process side pressure oil chambers 7b and 7b of the double-acting hydraulic cylinders 7 and 7 of the first and second pressure feeding units A and B, the high pressure oil passage 9 and the tank oil passage 10. And the double-acting hydraulic cylinders 7 and 7 in the first and second pressure feeding units A and B, which are connected to the high pressure oil passage 9 and communicate with the pressure oil chambers 7b and 7b on the filling process side. Each filling process side pressure oil chamber 7
b, 7b connected to the tank oil passage 10, the second control valve means C2, C3. (Switching mechanism) The first control valve means C1 is switched to the third state III and the second control valve means C2 is switched to the second state II in the final stage L3 of the pressure feeding process of the first pressure feeding unit A, and the second pressure feeding unit is In the pressure-feeding process intermediate region L2 of B, the first control valve means C1 is switched to the second state II and the second control valve means C2 is switched to the first state I, and in the pressure-feeding process end region L3 of the second pressure-feeding unit B. The first control valve means C1 is switched to the third state III, the second control valve means C2 is switched to the second state II, and the first pressure feeding unit A
The first control valve means C1 is switched to the first state I and the second control valve means C2 is placed in the first state I in the intermediate region L2 of the pressure feeding process.
Switching mechanism C3 for switching to