JP2002202051A - Reciprocating pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient reciprocating pump device for eliminating the occurrence of useless time required for only suction operation in reciprocating piston pumps. SOLUTION: The volume in a cylinder 1 is repeatedly increased and decreased by relative repeated motion of the cylinder 1 and a piston 2. Fluid is sucked and delivered even in either of a relative repeated process between both the cylinder 1 and the piston 2 from a pair of suction ports 1b and 1d and a pair of delivery ports 1a and 1c arranged in the cylinder 1. The reciprocating piston pumps 3 being almost the same in the pressing area ratio (F1:F2 and G1:G2) of a forward passage to a backward passage of the piston 2 are continuously arranged in a plurality. The pressing area or the pressing speed ratio of a plurality of these reciprocating piston pumps 3 is changed, and the delivery quantity ratio of fluid is determined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating pump device, and more particularly to a piston-cylinder type reciprocating pump device for performing suction and discharge by reciprocating a piston in a cylinder.

[0002]

2. Description of the Related Art Conventionally, fluid pumps include a reciprocating pump, a rotary pump, a centrifugal pump, an axial pump and the like. One of the reciprocating pumps is a reciprocating pump in which a cylindrical cylinder is used as a liquid tank and a piston is reciprocated in the cylinder to suck and discharge a fluid.

In the above-described piston-cylinder pump, the cylinder is usually provided with a suction port and a discharge port, respectively. For example, the fluid in the cylinder is caused by the outward movement (push operation) of the piston. Is discharged, and is sucked into the cylinder by the return stroke (pulling operation) of the piston.

[0004]

Therefore, in the conventional reciprocating piston pump, the fluid is pumped only when the piston moves forward in the discharge direction, and the fluid is not pumped when the piston moves backward. Therefore, only the suction operation is required. There was a problem that wasted time was generated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is intended that one of the suction ports be inhaled at the same time as one of the suction ports is inhaled. It is an object of the present invention to provide an efficient reciprocating pump device which eliminates the useless time required only for the suction operation in the reciprocating piston pump by discharging from the reciprocating piston pump.

[0006]

In order to achieve the above object, a reciprocating pump device according to the present invention is characterized in that the volume in a cylinder is repeatedly increased and decreased by the relative reciprocating motion of a cylinder and a piston. Thus, in both of the relative repetitive processes between the cylinder and the piston from the suction port and the discharge port provided in the cylinder, the fluid is sucked and discharged, and the pressing area ratio between the outward path and the return path of the piston is reduced. A plurality of substantially the same reciprocating piston pumps are provided in series, and the discharge amount ratio of the fluid is determined by changing the pressing area ratio or the pressing speed ratio of the plurality of reciprocating piston pumps.

In the following, for convenience of explanation, it is assumed that the cylinder is fixed and the piston is reciprocated with respect to the cylinder, but the relationship between the two is that the piston is fixed and the cylinder is moved relative to the piston. The same applies to reciprocating motion.

[0008]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. 1 and 2 are front sectional views showing one embodiment of a reciprocating pump device according to the present invention,
FIG. 3 is a front sectional view showing another embodiment of the reciprocating pump device according to the present invention, and FIG. 4 is a configuration diagram showing the operation of the reciprocating pump device.

As shown in FIGS. 1 to 3, a reciprocating pump device according to the present invention comprises a cylindrical cylinder 1 serving as a liquid tank.
(1A, 1B) and two piston pumps 3 each comprising a piston 2 (2A, 2B) inserted into the cylinder 1 (1A, 1B). In this embodiment, these piston pumps 3 will be described as a device A and a device B for convenience.

[0010]

[Embodiment 1] A piston type pump 3 as an apparatus A and an apparatus B shown in FIG. 1 has a cylinder 1A and a cylinder 1B having an inner diameter larger than that of the cylinder 1A.
Each piston 2A and 2B is reciprocated, and the cylinder 1
The suction and discharge of the fluid into and from the cylinder are performed by repeatedly increasing and decreasing the volumes in A and 1B. That is, the piston 2B of the device B is more than the piston 2A of the device A.
Is set so as to increase the pressing area. As a specific configuration for reciprocating the pistons 2A and 2B,
A long screw portion 2a is formed on one end side of the pistons 2A and 2B, and the screw portion 2a is screwed to a worm gear 5 connected to a single motor 4 that can rotate forward and reverse via gears 4a and 5a. To reciprocate.

Each of the cylinders 1A and 1B has a pair of suction ports 1b and 1d and a pair of discharge ports 1a and 1
c so that the fluid can be sucked and discharged in any of the repetitive processes of the cylinders 1A and 1B. That is, for example, suction can be performed at one suction port 1b and discharged from the other discharge port 1c at the same time, and suction can be performed at the other suction port 1d and simultaneously discharged from the one discharge port 1a. With this configuration, it is possible to obtain an efficient reciprocating pump device that eliminates the useless time required only for the suction operation in the reciprocating piston pump.

In the apparatus of this embodiment, the pistons 2A and 2B have substantially the same pressing area ratio between the forward path and the backward path, and the pressing area ratio between the cylinders 1A and 1B is different. And the discharge amount ratio of the fluid in the apparatus B can be determined. That is, as shown in FIG. 2, the pressing area F1 of the piston 2A in the forward path and the pressing area F2 of the returning path in the device A
And the ratio G1: G2 of the pressing area G1 of the piston 2B in the forward path and the pressing area G2 of the returning path of the device 2B in the device B are substantially the same, and at least an error of 2% or less. The two piston pumps A and B are driven by a single motor 4 via a gear mechanism, so that the discharge rate ratio F1: G1 of the fluid from the two piston pumps A and B is obtained. Or F
2: G2 can be determined.

[0013]

Embodiment 2 Next, another embodiment of the reciprocating pump device according to the present invention will be described. For convenience, the same components as those in the first embodiment will be described with the same reference numerals. In the embodiment shown in FIG.
It is configured to be connected continuously. That is, the piston 2A is reciprocated while the cylinder 1A having the same diameter is fixed in both units, and the volume in the cylinder 1A is repeatedly increased and decreased to suck and discharge the fluid into the cylinder. I have. As a specific configuration for reciprocating the piston 2A, a long screw 2a is formed on one end of the piston 2A, and the two motors 4A capable of rotating the screw 2a forward and reverse and having different rotation speeds. And 4B have gears 4b and 5 respectively.
The worm gear 5 is reciprocated by being screwed into the worm gear 5 connected thereto via a.

In the apparatus of this embodiment, the pressing area ratio between the forward path and the backward path of the piston 2A is substantially the same. That is, the ratio F1: F2 of the pressing area F1 of the piston 2A in the forward path to the pressing area F2 of the returning path in the apparatus A.
And the error is at least 2% or less. The two piston pumps A and B are driven by two motors 4A and 4B via a gear mechanism, and the two motors are controlled electrically or electronically to change the rotation speed ratio. Thus, the ratio of the discharge amount of the fluid can be determined by changing the pressing speed ratio of these two piston pumps A. Incidentally, the method of changing the pressing speed ratio is not limited to the method of changing the motor output or adjusting the rotation speed as in the present embodiment, but includes a combination of a gear mechanism, a cam mechanism, a pulley and a belt. It may be controlled by a transmission mechanism.

The cylinder 1A is provided with a pair of suction ports 1b and 1d and a pair of discharge ports 1a and 1c at both ends thereof. The cylinder 1A sucks and discharges fluid in any of the repetitive processes of the cylinder 1A. Have been able to. That is, for example, suction can be performed at one suction port 1b and discharged from the other discharge port 1c at the same time, and suction can be performed at the other suction port 1d and simultaneously discharged from the one discharge port 1a. With this configuration, it is possible to obtain an efficient reciprocating pump device that eliminates the useless time required only for the suction operation in the reciprocating piston pump.
In each of the above embodiments, a pair of suction ports and a plurality of discharge ports are provided. However, the present invention is not limited to this, and only one suction port is provided. For example, the discharge ports 1a and 1c may be provided. The suction port and the discharge port may be alternately switched by operating a valve.

A pair of suction ports 1b and 1d of the cylinders 1 (1A and 1B) of the apparatus A and the apparatus B of each of the above embodiments are connected to a fluid supply path 8 via valves 6a and 6b, respectively. The pair of discharge ports 1a and 1c are connected to the fluid delivery path 9 via valves 7a and 7b, respectively. Here, the delivery path 9 is an injection path for injecting a fluid into the stirring and mixing device V. The operation of the apparatus of the present invention will be specifically described with reference to FIG. Cylinder 1 as liquid tank
When the cylinder 1 moves backward (pulling operation) with the valves 6b and 7a opened and the valves 6a and 7b closed, fluid is sucked from the suction port 1d and the discharge port is sucked. 1a discharges a fluid (FIG. 4)
(See (d) and (a)). Next, at the same time as the cylinder 1 moves forward, the valves 6a and 7b are opened, and the valve 6b
And 7a are closed, fluid is sucked from the suction port 1b, and fluid is discharged from the discharge port 1c (FIG. 4).
(See (b) and (c)).

The reciprocating pump device of the present invention is configured to be attached to, for example, a stirring and mixing device V. Stirring mixing device V
The stirrer 11 vibrates up and down while the fluid to be mixed is circulated inside the casing 10 to stir and mix a liquid, gas or powder, etc.
It is used as a stirrer for an apparatus that performs a chemical reaction such as an adjustment or an oxidation-reduction reaction. By using the pump device of the present invention, it is possible to control the flow rates of at least two kinds of fluids to be mixed and to send the liquids accurately and efficiently according to the mixing ratio.

The gist of the present invention resides in that the discharge rate of the fluid is determined by changing the pressing area ratio or the pressing speed ratio of the plurality of reciprocating piston pumps, and is not limited to the above embodiments. . For example, in the apparatus of the first embodiment, two motors having different rotation speeds may be used to change both the pressing area ratio and the pressing speed ratio. Further, in the apparatus of the second embodiment, a single motor may be used as a drive source, and a gear ratio linked to each piston may be changed to change a pressing speed ratio.
It goes without saying that various applications are possible for the combination of these pumps and the configuration of the drive mechanism.

[0019]

The present invention is constructed as described above, and reciprocates by sucking in one suction port and discharging from the other discharging port, and sucking in the other suction port and discharging from one discharging port simultaneously. There is an excellent effect that it is possible to provide an efficient reciprocating pump device that eliminates the useless time required only for the suction operation in the piston pump.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an embodiment of a reciprocating pump device according to the present invention.

FIG. 2 is a front sectional view showing one embodiment of a reciprocating pump device according to the present invention.

FIG. 3 is a front sectional view showing another embodiment of the reciprocating pump device according to the present invention.

FIG. 4 is a configuration diagram showing an operation of the reciprocating pump device according to the present invention.

[Explanation of symbols]

 V Stirring mixer 1 cylinder 1A cylinder 1B cylinder 1a discharge port 1b suction port 1c discharge port 1d suction port 2 piston 2A piston 2B piston 2a screw portion 3 piston pump 4 motor 4A motor 4B motor 4a gear 5 worm gear 6a gear 6a Valve 7a Valve 7b Valve 8 Supply path 9 Delivery path 10 Casing of stirring and mixing device 11 Stirring body of stirring and mixing device

Claims (1)

[Claims] 1. A relative repetitive process between a cylinder and a piston from a suction port and a discharge port provided in the cylinder by repeatedly increasing and decreasing the volume in the cylinder by the relative repetitive motion of the cylinder and the piston. In both cases, the suction and discharge of the fluid are performed, and a plurality of reciprocating piston pumps having substantially the same pressing area ratio between the forward path and the backward path of the piston are provided in series, and the pressing area ratio of the plurality of reciprocating piston pumps or A reciprocating pump device that determines a discharge amount ratio of a fluid by changing a pressing speed ratio.