JPS62195479A - Rotary pump - Google Patents

Abstract

PURPOSE:To reduce the pulsation of a rotary pump by installing the swingable wheels each having a partitioning plate in swingable ways, in the eccentric supporting holes in a driving wheel and connecting a pair of pump parts having a fixed pipe body having a sliding groove for the partitioning plates inside the swingable wheels so that the pulsation phase is made reverse. CONSTITUTION:A pair of eccentric supporting hole parts 51 and 52 are formed with each direction of eccentricity different by 180 deg., in a driving wheel 7, and swingable wheels 3 and 4 are installed through bearings 8 and 9 into the supporting hole parts 51 and 52. Partitioning plates 5 and 6 projecting inwardly are installed in swingable ways into the swingable wheels 3 and 4, and a fixed pipe body 2 which is arranged concentrically with the revolution axis line of a driving wheel 7 and has the sliding groove for the partitioning plates 5 and 6, intake ports 44 and 46, and discharge ports 45 and 47 is installed inside the swingable wheels 3 and 4. Since, with such constitution, each compression phase of a pair of pump chambers 30 and 31 formed by the swingable wheels 3 and 4 and the fixed pipe body 2 is made reverse, the pulsation of the rotary pump can be reduced.

Description

Detailed Description of the Invention A1 Object of the Invention (1) Industrial Application Field The present invention provides a rotary pump 1 which provides a pumping action to a pump chamber by a rocking ring that swings eccentrically with respect to a rotational drive axis. ．． In particular, the present invention relates to a pulsation-free rotary pump that reduces pulsation of fluid pumped from a pump chamber.

(2) Prior Art Conventionally, as a rotary pump for pumping fluid, a reciprocating pump, a gear pump, a vane pump, etc., which pumps fluid by a piston that reciprocates within a cylinder, has been used.

(3) Problems to be solved by the invention However, although a reciprocating pump with a constant piston stroke can maintain a constant flow rate, pulsation of the pumped fluid cannot be avoided, and gear pumps and vane pumps Although this method can prevent pulsation of the pumped fluid, it is not possible to accurately pump the fluid at a predetermined flow rate.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a rotary pump with a simple structure that can pump fluid at an accurate predetermined flow rate and prevent pulsation from occurring.

B2 Structure of the Invention (Means for Solving Problem 11) The rotary pump of the present invention has a fixed pipe body whose both ends can be connected to a pipe line, and a suction chamber and a discharge chamber defined between the inner surface of the pipe body. a partition wall provided along one diameter line in the axially intermediate interior of the tube body; and communication holes that can communicate the suction chamber and the discharge chamber individually to the upstream and downstream ends of the tube body; and a pair of end walls that close off both ends of the discharge chamber in the axial direction; first and second rocking wheels; a plurality of support flanges provided on the outer periphery of the tube body to slidably support both axial ends of each rocking wheel; a suction port and a discharge port bored in the pipe body so as to communicate with the first and second pump chambers in pairs; a groove opened on the outer surface of the pipe body and provided in the partition wall between each suction port and the discharge port; In order to divide each pump chamber into a low pressure chamber connected to the suction port and a high pressure chamber connected to the discharge port, each port a pair of partition plates that are slid together;
The inner surface has a support hole and a second support hole that is eccentric from the axis of the tube in a direction 180 degrees deviated from the first swing ring and surrounds the second swing ring, and is arranged around the same axis as the tube. It includes a rotating, basically cylindrical drive wheel; and bearings individually interposed between the first support hole and the first rocking wheel, and the second support hole and the second rocking wheel.

(2) Function As the drive wheel rotates, the first and second rocking wheels shift their contact positions with the outer surface of the tube in the rotational direction of the drive wheel, with a phase shift of 180 degrees. It oscillates like this,
Fluids whose pulsation phases are shifted by 180 degrees from the first and second pump chambers can be combined in a common discharge chamber and pumped.

(3) Example Below, an example of the present invention will be explained with reference to the drawings. First, in FIGS. 1 to 3, this rotary pump l is
A fixed tube body 2, first and second swing wheels 3.4, and a first
and a second partition plate 5.6, a drive shaft 7 rotatably driven by a drive source (not shown), the drive wheel 7, and bearings 8, 9 interposed between the first and second swing wheels 3. Equipped with.

The tube body 2 is basically of cylindrical design, and connecting tubes 12.13 with flanges 10.11 are screwed into both ends of the tube body 2. Therefore, the tube body 2 can be inserted in the middle of the conduit by means of the flanges 10.11 at both ends thereof.

A pair of end walls 14 and 15 perpendicular to the axis are provided at an interval in the axially intermediate interior of the tube body 2, and a section along one diameter line of the tube body 2 is provided between the end walls 14 and 15. A wall 16 is provided. These end walls 14, 15, partition wall I
6 and the inner surface of the tube body 2 define a suction chamber 17 and a discharge chamber 18 on both sides of the partition wall 16 .

4 and 5, one end wall 14 is provided with a communication hole 19 for communicating the suction chamber 17 with the upstream end of the tube body 2 (the right end in FIG. 1), and the other end wall 15 is provided with a communication hole 20 that allows the discharge chamber 18 to communicate with the downstream end (left end in FIG. 1) of the tube body 2.

The first and second swing wheels 3 and 4 are formed into the same cylindrical shape and are arranged to surround the tube body 2.

One end of each swing ring 3.4 is in sliding contact with both sides of the annular support flange 21, the other end of the first swing ring 3 is in sliding contact with one surface of the annular support flange 22, and further the second swing ring The other end of 4 is in sliding contact with one surface of an annular support collar 23. Each support collar 21, 22.
23 is fitted to the outer periphery of the tube body 2, and support flanges 22.23 on both sides are attached to a clamping plate 24.25 fixed to the tube body 2.
The axial position is fixed by this contact.

Both clamping plates 24 and 25 are connected to the step portion 2 provided on the outer surface of the tube body 2.
6, 27 and the connecting tube 12.13, and between each connecting tube 12.13 and the clamping plate 24.25, there is a threaded portion between the tube body 2 and the connecting tube 12.13. Annular sealing members 28, 29 are interposed to prevent fluid leakage from.

A first pump chamber 30 is defined by the support flanges 21, 22, the first swinging wheel 3, and the tube body 2, and a second pump chamber 31 is defined by the support flanges 21, 23, the second swing wheel 4, and the tube body 2. be done. In addition, each support collar 21.22°23 and drawing wheel 3.
4 is covered with a bellows-shaped diaphragm 32, and both ends of the diaphragm 32 are held between the support collar 22 and the clamping plate 24, and between the support collar 23 and the clamping plate 25, respectively.

A first groove 3 that opens on the outer surface of the tube body 2 between the support collars 21 and 22
3 and the first groove 33 in the tube body 2 between the support collar 21.23.
A second groove 34 that opens on the outer surface as an extension of the partition wall 16 is provided in the partition wall 16, and in these grooves 33 and 34 are first and second partition plates 5.4 whose proximal ends are supported on the drawing wheel 3.4. 6 are rubbed together.

That is, a locking groove 35.36 with a keyhole-shaped cross section is provided on the inner surface of the first and second swing wheels 3.4 over the entire length in the axial direction, and a locking groove 35.36 with a spherical shape provided at the base end of the side partition plate 5.6 is provided on the inner surface of the first and second swing wheels 3.4. An engaging portion 37.38 is engaged with each locking groove 35.36. Thereby, the base end of each partition plate 5.6 is attached to each of the swing wheels 3, 4 so as to be swingable about an axis parallel to the axis of the tubular body 2.

The pump chambers 30, 31 are partitioned into a low pressure chamber 39.40 and a high pressure chamber 41.42 by the partition plates 5.6. That is, along the rotation direction 43 of the drive wheel 7,
The portion of the pump chamber 30.31 from the side partition plate 536 to the contact position of the drawing driving wheels 3 and 4 with the tube body 2 functions as a low pressure chamber 39.40 whose volume increases according to the rotation of the driving wheel 7. The partition plates 5 and 6 are moved along the rotation direction 43 from the contact position.
The pump chamber 30.31 up to this point functions as a high pressure chamber 41.42 whose volume decreases in accordance with the rotation of the drive wheel 7.

The tube body 2 on both sides of the partition wall 16 between the support collars 21 and 22
A first suction port 44 that allows the suction chamber 17 to communicate with the low pressure chamber 39 and a first discharge port 45 that allows the high pressure chamber 41 to communicate with the discharge chamber 18 are provided. Also, support tsuba 21.
23, the tubular body 2 has a second suction port 44 that communicates the suction chamber 17 with the low pressure chamber 40, and a second discharge port 47 that connects the high pressure chamber 42 with the discharge chamber 18. provided.

The drive wheel 7 is basically formed in a cylindrical shape with a circular outer surface concentric with the tube body 2, and is arranged to surround the diaphragm 32. Also, both ends of the drive wheel 7 and the connecting pipe 12
．． 13, bearings 48 and 49 are interposed.

In addition, a heald groove 50 for suspending a V-belt (not shown) is provided on the outer surface of the axially central center of the drive wheel 7 over the entire circumference, and transmission from a drive source (not shown) via the V-belt is provided. The drive wheel 7 is rotationally driven around the same axis as the tube body 2 by the driving force.

A circular first support hole 51 corresponding to the first swing wheel 3 and a circular second support hole 52 corresponding to the second swing wheel 4 are provided on the inner surface of the drive wheel 7 .

Moreover, the first support hole 51 is eccentric by an amount E from the center C of the tube body 2.
The second support hole 52 is eccentric from the first support hole 5.
1, and is eccentric from the center C by the eccentricity IE.

A hair ring 8 is interposed between the diaphragm 32 and the first support hole 51 at a portion corresponding to the first swing wheel 3, and a hair ring 8 is interposed between the diaphragm 32 and the second support hole at a portion corresponding to the second swing wheel 4. A bearing 9 is interposed between the portion 52 and the portion 52 .

Next, to explain the operation of this embodiment, when the drive wheel 7 is rotationally driven by a drive source (not shown), the first and second swing wheels 3 and 4 direct the contact position to the outer surface of the tube body 2 in the rotation direction 43. It oscillates as it changes. For example, the first
Considering the rocking wheel 3, since the first support hole 51 is eccentric from the center C of the tube body 2 by the eccentricity IE, the inner surface of the first support hole 51 and the tube are at a certain position along the circumferential direction. The distance from the outer surface of the body 2 changes according to the rotation of the driving wheel 7, and the first swinging wheel 3 swings via the bearing 8. As a result, the first pump chamber 30 has a low pressure chamber 39 and a high pressure chamber 41.
A change in volume occurs and a pumping action is performed. That is, the first swinging wheel 3 is connected to the first suction and discharge port 44,45.
When the first suction port 44 is in contact with the pipe body 2 between
The low pressure chamber 39 communicating with the first discharge port 45 is in a state immediately before the start of suction, when its volume has contracted the most, and the high pressure chamber 41, which communicates with the first discharge port 45, is in a state immediately before the start of ejection, when its volume has expanded the most.

When the first swinging wheel 3 swings in accordance with the rotation of the drive wheel 7 from this state, the low pressure chamber 39 gradually increases its volume, sucks fluid from the suction chamber 17 through the first suction port 44, and the high pressure chamber 41 gradually contracts its volume and discharges fluid from the first discharge port 45 into the discharge chamber 18 . In this way, one cycle of the suction and discharge strokes is completed by one revolution of the drive wheel 7, and fluid corresponding to the volume of the first pump chamber 30 is discharged.

The discharge characteristics in the first pump chamber 30 are shown by the curve {circle around (2)} in FIG. On the other hand, since the second swinging wheel 4 swings 180 degrees out of phase with the first swinging wheel 3, the fluid discharge characteristics due to the pump action of the second pump chamber 31 are as shown by the curve ■ in FIG. will be out of phase by 180 degrees. Therefore, the discharged fluid from the first and second pump chambers 30, 31 each exhibits pulsation characteristics, but the discharge characteristics of the rotary pump l, which is the sum of these fluids, is independent of the rotational position of the drive wheel 7. becomes constant.

By the way, the first and second swinging wheels 3.4 try to follow the rotation of the drive wheel 7, but the first and second partition plates 5.6 are not aligned with the first and second grooves 33°34. Since they are sliding together, they are prevented from following. At this time, the base ends of the side partition plates 5 and 6 are attached to the drawing wheel 3.4 so as to be swingable around an axis parallel to the axis of the tube body 2.
This does not interfere with the swinging motion of the drawing wheel 3.4.

In addition, each support collar 21, 22.23 and drawing wheels 3, 4
Since it is covered with the diaphragm 32, leakage of fluid can be reliably prevented. Further, the diaphragm 32 can be easily removed, and the diaphragm 32 can be easily removed and cleaned.

Furthermore, by changing the rotational speed of the drive wheels 7, it is also possible to continuously change the discharge amount.

C0 Effects of the Invention As described above, according to the present invention, the first and second swinging wheels that define the pump chamber between the pipe body and the pipe body are swung with a phase shift of 180 degrees according to the rotation of the drive wheel. The suction chamber and discharge chamber defined within the tube body are used as common to both pump chambers to perform the pumping action, thereby minimizing pulsation and discharging fluid at an accurate discharge amount. I can do it. Moreover, since the partition plate is swingable, the swinging wheel can operate smoothly.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view, and is a cross-sectional view corresponding to line 1-1 in FIGS. 2 and 3. Figure 3 is a cross-sectional view taken along line m-m in Figure 1, and Figure 4 is a cross-sectional view taken along line II-n in Figure 1.
5 is a sectional view taken along the line VV in FIG. 1, and FIG. 6 is a discharge characteristic diagram. DESCRIPTION OF SYMBOLS 1... Rotary pump, 2... Pipe body, 3.4... Rocking wheel, 5.6... Partition plate, 7... Drive wheel, 8, 9...
・Bearing, 14.15... End wall, 16... Compartment wall, 17... Suction chamber, 1st... Discharge chamber, 19.20
...Communication hole, 21-23...Support collar, 30.31.
...Pump chamber, 33°34...Groove, 39.40...
Low pressure chamber, 41.42... High pressure chamber, 44.46... Suction port, 45.47... Discharge port, 51.52.
...Support hole Fig. 3 r-4 Fig. 2-A Fig. 6 Angular displacement Fig. 4 Fig. 5

Claims (1)

[Claims] a fixed pipe whose both ends can be connected to a pipe; a partition wall provided along one diameter line inside the pipe in the axial direction to define a suction chamber and a discharge chamber between the inner surface of the pipe; and;
a pair of end walls each having a communication hole that allows the suction chamber and the discharge chamber to communicate with the upstream and downstream ends of the pipe body individually, and closing both axial ends of the suction chamber and the discharge chamber; and the outer surface of the pipe body; cylindrical first and second rocking wheels surrounding the tubular body at intervals in the axial direction to define first and second pump chambers; both ends of each drive wheel in the axial direction are slidably supported; a plurality of support flanges provided on the outer periphery of the tubular body; a suction port bored in the tubular body so as to communicate a pair of suction chambers and a discharge chamber with the first and second pump chambers on both sides of the partition wall; a discharge port; a groove opened to the outer surface of the pipe body and provided in the partition wall between each suction port and the discharge port; in order to divide each of the pump chambers into a low pressure chamber connected to the suction port and a high pressure chamber connected to the discharge port; a pair of partition plates whose base ends are attached to each drive wheel and slide into the respective grooves so as to be able to swing around an axis parallel to the axis of the tube; a first swinging wheel eccentric to the axis of the tube; a first support hole that surrounds the tube body; and a second support hole that is eccentric from the axis of the tube body in a direction deviated by 180 degrees from the first rocking wheel and surrounds the second rocking wheel on the inner surface; a basically cylindrical drive wheel that rotates about the same axis as; a bearing that is individually interposed between the first support hole and the first swinging wheel, and the second support hole and the second swinging wheel;
A rotary pump comprising: