JPS5840662B2 - fluid pump - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in fluid pumps.

The inventor of the present application has already discovered that compared to conventional positive displacement pumps, the number of parts is reduced and the structure is extremely simple and compact. Invented a fluid pump suitable for transporting difficult-to-handle fluids such as viscous fluids (Patent application 1986-115)
However, the present invention further improves the performance of the fluid pump during high-speed operation and reduces the number of parts so that it will not break down or deteriorate in function even when operated for a long period of time. The object of the present invention is to provide a fluid pump that has the following features.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. C is a pump casing of the fluid pump of the present invention, and the left and right covers 2 are similarly cylindrical on both left and right sides of a cylindrical casing body 1 having a cylindrical hollow part. 3 01 J ng 4
. The casing main body 1 and the left and right covers 2 and 3 are integrally connected by threading and tightening a plurality of connecting bolts 13 between them.

A short cylindrical cylinder assembly 10 is movably accommodated in the casing body 1, and a truncated conical tapered shaft hole 11 is bored in the center of the cylinder assembly 10 in the axial direction. and four cylinder holes 12 are bored in the radial direction with a phase difference of 900 degrees.
Both ends of these cylinder holes 12 are open to the outer peripheral surface of the cylinder assembly 10 and the tapered shaft hole 11.

Furthermore, four notched circular holes 14 are bored in the axial direction between the cylinder holes 12 of the cylinder assembly 10, and guide pins 15 are passed through these notched circular holes 14, and the cylinder assembly The body 10 is allowed to swing, but its rotation is inhibited.

A rotating shaft 16 is rotatably supported in the center of the pump casing C via bearings 19 and 20 provided on the left and right covers 2.3, and an eccentric crank in the shape of a tapered roller is attached to one end of the rotating shaft 16. A portion 17 is integrally formed, and this eccentric crank portion 17 is rotatably fitted into the tapered shaft hole 11 of the cylinder assembly 10.

The rotating shaft 16 penetrates the left cover 2 of the pump casing C and protrudes outward, and its outer end is connected to the coupling 18.
The rotary shaft 16 is connected to a geared motor M supported by the stand 8 through the geared motor M, and the rotating shaft 16 is rotationally driven by the geared motor M.

Further, the gap between the rotary ring 16 and the left cover 2 is sealed by a gland 5 seal 21 and a seal retainer 22.

The rotation center of the rotation shaft 16 is eccentric with respect to the center of the cylinder assembly 10 by an eccentric amount e (FIG. 3), and
When the cylinder 6 rotates, the cylinder assembly 10 moves eccentrically through its eccentric crank portion 17.

As clearly shown in FIGS. 2 and 3, the eccentric crank portion 17 is
Concave grooves 23 and 24 having a U-shaped cross section are cut out in the lateral direction on both sides thereof, facing each other. It is designed to communicate with

Further, a suction passage 25 and a discharge passage 26 are bored in the rotating shaft 16 so as to face each other on its vertical axis.
5 has one end communicating with an inflow passage 27 formed in the right cover 3 of the pump casing C, and the other end communicating with one of the concave grooves 23 through a suction passage 28 formed in the eccentric crank part 17.
One end of the discharge passage 26 communicates with an outflow passage 29 formed in the left cover 2 of the pump casing C, and the other end communicates with the other end through a discharge passage 30 formed in the eccentric crank part 11. It communicates with the groove 24.

Four piston pins 31 are supported in the casing body 1 of the pump casing C in parallel to its longitudinal axis with a phase difference of 90°. The base end of the piston holder 32 is rotatably supported.

At the tips of the four piston holders 32, pistons 34 made of an elastic material such as rubber and having a spherical outer circumferential surface are rotatably supported by piston holders 33 screwed thereon.

Each of the four pistons 34 is connected to the cylinder assembly 10.
The cylinder hole 12 is housed in a cylinder hole 12 formed in the cylinder hole 12, and their spherical outer circumferential side surface is slidably engaged with the inner circumferential wall of the cylinder hole 12.

In the cylinder hole 12 of the mouth, first to fourth suction and discharge chambers al are formed by the piston 34 and the eccentric crank part 17.
, a2 y a3 and a4 are formed.

Next, to explain the operation of the fluid pump of the present invention configured as described above, when the rotating shaft 16 is driven by the geared motor M, the eccentric crank portion 17 also rotates, and the cylinder assembly fitted therein rotates. 10 rotates eccentrically, but the rotation is restrained by the guide pin 15.

By the way, when the eccentric crank part 17 applies a suction/discharge action to the first to fourth suction/discharge chambers al, a2, a3, and a4 through its rotation, it acts as an on-off valve, and this function will be mainly explained below. To explain this with reference to FIGS. 4 to 7, when the eccentric crank part 17 is in the position shown in FIG. The first suction and discharge chamber a1 is the most expanded at the end of the suction stroke (immediately before the start of the discharge stroke), the second suction and discharge chamber a2 is in the middle of the suction stroke, and the third suction and discharge chamber a3 is the most expanded. At the end of the discharge stroke after being contracted (
(immediately before the start of the suction stroke) and the fourth suction/discharge chamber a4 are in the middle of the discharge stroke.

By the way, when the rotating shaft 16 rotates clockwise in FIG. 5, the eccentric crank part 17 also rotates in the same direction, so that the suction/discharge chamber A enters the discharge stroke and its volume is gradually contracted. Discharge passage 30 is in communication and the fluid therein is pressurized and pumped through outlet passage 29 and into discharge passage 26 .

The discharge passage hole 30 is in the state shown in FIG. 6 from FIG. 5 (900
1 (1800 rotations), the volume of the first suction/discharge chamber a1 is contracted to the maximum by the eccentric crank part 17, and the communication with the discharge passage hole 30 is cut off. The compression stroke ends.

When the eccentric crank part 17 further rotates from the state shown in FIG. through the suction passage 25 to the -th suction and discharge chamber a1
Inhale inside.

When the eccentric crank part 17 rotates through FIG. 4 (270° rotation) in which the suction hole 28 is fully opened to the first suction/discharge chamber a1 to FIG. 5 (360° rotation), the second suction/discharge chamber a1 is When the portion 17 expands to the maximum, the communication with the suction passage hole 28 is cut off, and the suction stroke ends.

As described above, the discharge stroke and suction stroke are performed in the first suction/discharge chamber a1 during one revolution of the eccentric crank portion 1γ.

Next, the second suction/discharge chamber a2 is 90° with respect to the second suction/discharge chamber a1.
With a phase difference of , the eccentric crank portion 17 provides exactly the same suction and discharge action as that of the first suction and discharge chamber a].

That is, while the eccentric crank part 17 rotates 1800 times as shown in FIGS. 6 to 4, the second suction/discharge chamber a2 is compressed by the eccentric crank part 17, and the discharge passage hole 30 opens therein. The fluid in the second suction/discharge chamber a2 is forced into the discharge passage 26 from the outflow passage 29.

Furthermore, while the eccentric crank part 17 rotates 1800 times as shown in FIGS. 4 to 6, when the second suction/discharge chamber a2 is expanded by the eccentric crank part 17, the suction passage hole 28 is opened therein. Then, fluid is sucked into the second suction/discharge chamber a2.

Furthermore, the third suction and discharge chamber a3 has the third suction and discharge chambers a1 and 18.
With a phase difference of 0.00, the eccentric crank portion 17 provides exactly the same suction and exhaust action as that of the first suction and discharge chamber a1.

That is, while the eccentric crank part 17 rotates 1800 times as shown in FIGS. 7 to 5, when the third suction/discharge chamber a3 is compressed by the eccentric crank part 17, the discharge passage hole 28 is opened there. However, the fluid in the third suction/discharge chamber a3 is fed under pressure to the discharge passage 26.

Furthermore, while the eccentric crank part 17 rotates 180 degrees as shown in FIGS. 5 to 7, when the third suction/discharge chamber a3 is expanded by the eccentric crank part 17, the suction passage hole 2
8 opens and fluid is sucked into the third suction/discharge chamber a3.

Furthermore, the fourth suction and discharge chamber a4 includes the above-mentioned first suction and discharge chamber a.

With a phase difference of 270°, the eccentric crank portion 17 provides exactly the same suction and exhaust action as the first suction and discharge chamber a1.

That is, while the eccentric crank part 17 rotates 180 degrees as shown in FIGS. 4 to 6, when the fourth suction/discharge chamber a4 is compressed by the eccentric crank part 17, the discharge passage hole 30 is opened there. The fourth suction/discharge chamber a4 is opened and the fluid in the fourth suction/discharge chamber a4 is forced into the discharge passage 26.

Furthermore, while the eccentric crank part 17 rotates 180 degrees as shown in FIGS. 6 to 4, when the fourth suction/discharge chamber a4 is expanded by the eccentric crank part 17, the suction passage hole 2
8 opens and fluid is sucked into the fourth suction/discharge chamber a4.

As described above, while the rotating shaft 16 is rotated once, the first to fourth suction and exhaust chambers al, a2, a3, and a4 undergo suction and discharge strokes in sequence, and the continuous rotation of the rotating shaft 16 causes the air in the suction passage 25 to Fluid may be continuously pumped into the discharge passageway 26.

Note that the fluid pump of the present invention can be used as a fluid motor, and in such a case, if pressure fluid is fed from the inflow path 27 to the suction path 25 and an initial rotational force is applied to the rotating shaft 16,
The suction and discharge actions of the first to fourth suction and discharge chambers al, a2, a3, and a4 can apply a rotational force to the rotating shaft 16, and use this as an output shaft to rotationally drive other appropriate driven members. I can do it.

As described above, according to the present invention, the cylindrical cylinder assembly 10 is housed in the pump casing C having a cylindrical hollow part so as to be non-rotatable and only freely movable, and in the center of the cylinder assembly 10, An eccentric crank part 17 formed at the end of a rotating shaft 16 rotatably supported by the pump casing C is rotatably fitted, and the cylinder assembly is provided with equal intervals in the circumferential direction. A plurality of cylinder holes 12 are bored radially, and a spherically formed outer peripheral side surface of a piston 34 made of an elastic material such as rubber is slidably inserted into these cylinder holes 12. The pistons 34 are fitted to the pump casing C through support shafts such as the piston pin 31 parallel to the rotating shaft 16 so as to be swingable, and the pistons 34 are connected to the eccentric crank portion. 17 to form suction and exhaust chambers a1, a2, a3, and a4 in the cylinder holes 12, respectively,
In addition, the eccentric crank part 17 has a suction hole 28, which has one end communicating with an inflow passage 27 formed in the pump casing C and the other end opening in the outer peripheral surface of the eccentric crank part 1γ.
and a discharge passage hole 30 having one end communicating with the outflow passage 29 formed in the pump casing C and the other end opening in the outer circumferential surface of the eccentric crank part 17. and discharge hole 28
．． The other end of 30 is a plurality of suction and discharge chambers al.

a21231 I made it connect to a4 sequentially, so
The suction and discharge chambers aH, a2 + a3, and a4 formed in the cylinder holes 12 can be sequentially expanded and contracted by the rocking of the pistons 34 and the eccentric movement of the cylinder assembly 10, and perform a pumping action. Since no member such as a spring that does not have good high-speed followability is used as a movable member, the piston 34 due to the eccentric movement of the cylinder assembly 10 during high-speed rotation.
... is performed accurately, and high-speed operation performance can be significantly improved.

Further, since the piston 34 is made of an elastic body such as rubber, the piston 34 itself is connected to the cylinder hole 12.
It can also be used as a packing member between... and can simplify the structure by reducing the number of parts.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view of the device of the present invention, and Fig. 2 is a side view of the device of the present invention.
Figure 3 is a vertical cross-sectional view taken along the line m--■ in Figure 1, and Figures 4 to 7 are the same cross-sectional views as Figure 3 showing the operation of the device of the present invention. 10... Cylinder assembly, 12... Cylinder hole, 16... Rotating shaft, 17...
Eccentric crank part, 27... Inflow path, 28...
...Suction hole, 29...Outflow passage, 30...
...Discharge hole, 31... Piston pin, 34
...Piston, C...Pump casing, al...First suction/discharge chamber, a2...Second suction/discharge chamber, a3...First Three suction and exhaust chambers, A4...
...Fourth suction and exhaust chamber.

Claims (1)

[Claims] 1 A cylindrical cylinder assembly 10 is housed in a pump casing C having a cylindrical hollow part so as to be non-rotatable and can only move freely, and a cylinder assembly 10 is rotatably supported in the center of the cylinder assembly 10 by the pump casing C. rotation axis 16
An eccentric crank portion 17 formed at the end of the cylinder assembly is rotatably fitted thereinto, and a plurality of cylinder holes 12 are bored radially in the cylinder assembly at equal intervals in the circumferential direction. The spherically formed outer circumferential side surface of a piston 34 made of an elastic material such as rubber is slidably fitted into these cylinder holes 12, and these pistons 34 are connected to the rotation axis. The pistons 34 are swingably supported in the pump casing C via support shafts such as piston pins 31 parallel to the pistons 16, and the pistons 34 cooperate with the eccentric crank portion 11 to move into the cylinder holes 12. Suction and exhaust chambers al and a2, respectively
, a3, and a4, and the eccentric crank part 11 has a suction passage whose one end communicates with the inflow passage 2γ formed in the pump casing C and whose other end connects to the outer peripheral surface of the eccentric crank part 17. a hole 28 , and a discharge passage hole 3 having one end communicating with an outflow passage 29 formed in the pump casing C and the other end opening on the outer circumferential surface of the eccentric crank portion 17 .
0 respectively, and the other ends of the suction and discharge passage holes 28, 30 are sequentially communicated with a plurality of suction and discharge chambers a1+a2, a3, and a4 by rotation of the eccentric crank portion 17.