JPS5818585A - Swing pump - Google Patents

Abstract

PURPOSE:To simplify sealing, by producing pump-action with only conical motion, without rotation of a swing plate installed as one body in a spherical body which is supported by a pump casing. CONSTITUTION:When a drive source 20 is driven, a conical ring 28 rotates around a drive shaft 22 and since this conical ring 28 is pressed to a drive disc 18, it moves along the circumference of the disc 18 while rotating itself according to this rotation. At this time, the disc 18 is no longer rotated because its integrated swing plate 9 is prevented from rotation by means of a diaphragm body 12. Therefore, according to rotation around an axis of the shaft 22 of the conical ring 28, a swing plate 16 will carry out conical motion around a point O and thereby a contact part between surfaces 10 and 11 of the swing plate 9 and the side of a hollow chamber 3 moves in the circumferential direction; pump-action is thus achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oscillating pump that sucks and pumps fluid using a disc-shaped oscillating member that performs conical motion.

When feeding special fluids such as blood, medical solutions, or liquid foods, where contamination with foreign substances or deterioration must be absolutely avoided, pumps are used to prevent lubricating oil from the drive parts and bearings from getting mixed in. It is necessary to use a pump whose chamber is completely sealed from the outside and which is made of a material that will not corrode or generate harmful substances due to the action of the fluid. In addition, for the delivery of blood in artificial organs, etc., and the delivery of liquid foods in food packaging machines, etc.,
In particular, it is necessary to use a pump that has no pulsation and can always provide a substantially constant discharge amount.

The present invention was made in response to such demands, and its purpose is to be able to construct all parts of the pump chamber from metal materials, yet with less pulsation and constant operation. An object of the present invention is to provide an oscillating pump that can obtain a substantially constant discharge amount.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. As shown in FIG. .2. A hollow chamber 3 is formed within the pump casing 1 . The inner circumferential surface 4 of the hollow chamber 3 is a spherical surface centered at a point O, and both side surfaces 5.6 thereof are flat, so that the hollow chamber 3 has a substantially barrel shape.

On both sides of the hollow chamber 3 are metal sphere retaining rings 7.7.
is fitted into the pump casing 1, and a sphere 8 is supported by this retaining ring 7.7 so as to be rotatable about point 0. This sphere 8 is integrally provided with a disc-shaped swing plate 9 extending outward along a plane passing through a point O at its center. Both surfaces 10.1 of this rocking plate 9
1 is formed as a conical surface, and when the rocking plate 9 swings around the point O as shown in FIG. Line contact is made with the other side surface 6 of the hollow chamber 3 on the opposite side of the point O, respectively. Further, the outer circumferential surface of the rocking plate 9 is formed as a spherical surface centered on the point O, and is always in contact with the inner circumferential surface 4 of the hollow chamber 3.

A pair of pump chambers pg and pr are defined within the hollow chamber 3 by this swing plate 9. The swing plate 9 has a notch at one location on its circumference, and a partition 12 that is perpendicular to the swing plate 9 is fitted into the cutout. As shown in FIG. 2.3, this partition body 12 extends from the outer surface of the sphere 8 to the inner peripheral surface 49 of the hollow chamber 3 and both sides 5 and 6 of the pump chamber pc.
, pr are partitioned in a fluid-tight manner in the circumferential direction.

The swing plate 9 can swing around a point O while slidingly contacting the partition 12. Pump casing 1
A suction port 13 and a discharge boat 14, which communicate with both the pump chambers Pg and Pr, are provided on both sides of the partition body 12, respectively.

On one side of the pump casing 1, there is an opening 1 connected to the sphere 8.
5 is formed, and a swing shaft 16 whose one end is fixed to the sphere 8 projects outwardly from the pump casing 1 through this opening 15. The opening 15 has a size that allows the swing axis 16 to swing around the point O at a certain angle. A pump drive disk 18 having a conical surface 17 formed on its outer periphery is fixed to the outer end of the swing shaft 16 . A cylindrical flexible metal diaphragm 19 is provided between the back surface of the drive disk 18 and the side surface of the pump casing 1 to provide a fluid-tight seal between the hollow chamber 3 and the outside. ing. This diaphragm 19 can also be shaped like a bellows.

The pump casing 1 is attached to and held by a drive source 20, such as a motor, by a mounting frame 21.

The end of the drive shaft 22 connected to the drive source 20 is connected to the drive disk 1
8, and a shifter 24 having a screw hole 23 perpendicular to its axis is slidably attached to the end thereof. A support shaft 25 is screwed into this screw hole 23, and the shifter 24 is fixed by screwing the support shaft 25 and pressing its tip against the bottom of the keyway 26 of the drive shaft 22. By loosening the screw, the shifter 24 can be slid in the axial direction of the drive shaft 22. In this way, the support shaft 2
5 is perpendicular to the drive shaft 22 and rotates integrally with the drive shaft 22. A ball bearing 27 is attached to the tip of the support shaft 25, and a conical ring 28 is fitted around the outer periphery of the ball bearing 27. The conical ring 28 has a conical surface 29 formed on its outer periphery, and this conical surface 29 comes into contact with the conical surface 17 of the drive disk 18.

In the above embodiment, both sides 5 and 6 of the hollow chamber 3
is a flat surface, and both surfaces 10.11 of the rocking plate 9 are conical surfaces, but this is reversed, that is, both sides 5,
Even if 6 is made a conical surface and both surfaces 10 and 11 of the rocking plate 9 are made flat, the operation is exactly the same.

Next, the operation of the above embodiment will be explained.

- Figure 1 shows the shifter 24 in the retracted position and the pump not being driven. In this state, the cross-sectional areas of the pump chambers pg and Pr are constant at any position in the circumferential direction. Here, when the shifter 24 is moved forward in the axial end direction of the drive shaft 22, the conical ring 28 attached to the support shaft 25 presses the pump drive disk 1B. As a result, as shown in FIG. 4, the swing shaft 16 is tilted around the point O, and the sphere 8 and the swing plate 9, which are integrally fixed thereto, are tilted around the point O. and,
Below point O in FIG. Line contact with 6. Therefore, the pump chambers pt and pr have two sides, a suction side and a discharge side, respectively, by this line contact portion and the partition body 12.
A chamber is formed.

When the drive source 20 such as a motor is driven in this state, the drive shaft 22 rotates, causing the support shaft 25 and the cone 1 nong 2B to rotate around the drive shaft 22. Since the conical ring 28 is pressed against the drive disk 18, the conical ring 28 rotates and moves along the outer circumference of the drive disk 18 due to this rotation. At this time, the drive disk 18 does not rotate even due to the frictional force of the conical ring 28, since the swing plate 9 integrated therewith is prevented from rotating by the partition 12. Therefore, the drive disk 18 is driven by the conical ring 2 at different positions on its outer circumference.
8, the direction of inclination of the swing shaft 16 changes. That is, the drive shaft 2 of the conical ring 28
By rotating around the axis 2, the swing shaft 16 performs a conical movement, in other words, a circular movement, around the point O.

Since the contact surfaces between the drive disk 18 and the conical ring 28 are both formed into conical surfaces, their contact is reliably maintained even by the conical movement of the drive disk 18.

Due to the conical movement of the oscillating shaft 16, the oscillating plate 9 also performs a conical movement around the point O, so that the respective contact portions between the surface 10, 11 of the oscillating plate 9 and the side surface of the hollow chamber 3 move in the circumferential direction. move along. Now, assuming that this movement direction is counterclockwise in FIG. 2 and the position of the partition 12 is upward as shown in the figure, the pump chamber Pg communicating with the suction port 13 on the left side of the partition 12 in FIG. The volumes of both pump chambers Pe and Pr tend to increase, and the volumes of the pump chambers Pe and Pr, which communicate with the discharge boat 14 on the right side of the partition 12, tend to decrease. That is, as shown in FIGS. 4 and 5, the pump chamber pe is located adjacent to the upper partition 12.
If the cross-sectional area of is maximum and the cross-sectional area of the pump chamber pr is 0, that is, the rocking plate 9 is in contact with the side surface 6 of the hollow chamber 3, then the rocking plate 9 makes a conical movement as described above. The upper cross-sectional area of the pump chamber Pg gradually decreases, but until the area reaches zero, the volume of the chamber on the side communicating with the suction port 13 increases, and the upper cross-sectional area of the side communicating with the discharge boat 14 increases. gradually increases, and the volume of the chamber on the side communicating with the suction port 13 gradually increases from 0, but the volume of the chamber on the side communicating with the discharge boat 14 immediately reaches the maximum volume from 0, and then gradually decreases. Therefore, on the side communicating with the suction port 13, the fluid is sucked into both the pump chambers Pg and pr, and on the side communicating with the discharge boat 14, the fluid is pressurized and discharged from both the pump chambers Pe and Pr. In this way, with the conical movement of the swing plate 90, the swing plate 9 and both sides 5 of the hollow chamber 30
, 6 moves, thereby performing a pumping action.

Since the contact portions between the rocking plate 9 and both side surfaces 5.6 of the hollow chamber 30 move in the circumferential direction with a phase shift of 180 degrees, as shown in FIGS. 4 and 5, the pump chamber Pe When the suction amount and discharge amount are maximum on the pump chamber Pr side, the pump chamber Pr side is in a state immediately before the start of suction and discharge, and the pump chamber Pe
When the suction and discharge amounts on the side gradually decrease, suction and discharge begin on the pump chamber Pr side, and the amounts gradually increase. Next, when the suction and discharge on the pump chamber Pe side are completed and the state is just before the start of the next stroke, the suction amount and discharge amount on the pump chamber Pr side become maximum.

Therefore, the suction port 13 and the discharge bore 4 common to the pump chambers Pe and Pr always suck and discharge a substantially constant amount of fluid, respectively. That is, no pulsation occurs in the fluid discharged from the discharge boat 14.

When the pump driving disk 18 performs a conical movement, the flexible diaphragm image 19 deforms following the conical movement, and maintains the sealing property between the hollow chamber 3 and the outside such as the driving part without interfering with the movement.

As described above, according to the present invention, the pumping action is produced by making only a conical motion without rotating the disc-shaped rocking plate, so that the driving force is transmitted to the rocking plate. There is no need to rotate the pump drive disc either.

Therefore, by providing a sealing diaphragm between the drive disk and the pump casing, it is possible to prevent foreign matter from entering the pump chamber, and also to prevent the fluid in the pump chamber from leaking. be able to. The diaphragm can be made of metal, and the sphere supporting the rocking plate can be supported in such a way that slight rocking can occur smoothly (no special lubrication is required). Therefore, the sphere retaining ring can also be made of metal.Therefore, all the components can be made of metal, making it possible to obtain a pump suitable for the delivery of special fluids.

In addition, a pair of pump chambers formed on both sides of the rocking plate perform a pumping action with a phase difference of 180 degrees, so that the fluid discharged from these pump chambers is discharged from a common discharge port. As a result, an oscillating pump with no pulsation and a nearly constant discharge amount can be obtained.

As shown in the example, if the conical ring can be slid in the axial direction of the drive shaft, the position can be easily adjusted when the pump casing is installed, so that the permissible range of pump machining accuracy can be adjusted. It also has the effect of being able to expand the

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the rocking pump according to the present invention when it is not in operation, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. A partial cross-sectional view of the hollow chamber taken along the line -■, Figure 4 is a vertical cross-sectional view similar to Figure 1 showing the same pump when it is in operation, and Figure 5 is a partial cross-sectional view similar to Figure 3 when the same pump is in operation. It is a diagram. Indoor peripheral surface, 5.6... Hollow chamber side, 8... Sphere, 9
...' Rocking plate, 10.11...Surface of rocking plate, 12
... Partition body, 13... Suction port, 14... Discharge port, 16... Rocking shaft, 17... Conical surface, 18...
...Pump drive disk, 19...Diaphragm, 20...Drive source, 22...Drive shaft, 25...Support shaft, 28...
Conical ring patent applicant Fuji --- Figure 2, Figure 3, Figure 1

Claims (2)

[Claims] (1) A substantially barrel-shaped hollow chamber formed in the pump casing and having both side surfaces and a spherical inner circumferential surface; supported by the pump casing so as to be rotatable about the center of the spherical inner circumferential surface. a spherical body; provided integrally with this spherical body along a plane passing through the center of the spherical body, the outer circumferential portion thereof is always in contact with the spherical inner circumferential surface of the hollow chamber, and the opposite surface is provided when making a conical movement; a disc-shaped rocking plate that is in line contact with both side surfaces of the hollow chamber on both sides of the center thereof; and a disc-shaped rocking plate that is provided in the hollow chamber perpendicularly to the rocking plate, and that the rocking plate creates an image on both sides of the rocking plate; a partition body that fluid-tightly partitions each of the pair of pump chambers into a suction side and a discharge side; a suction boat and a discharge boat that communicate with each pump chamber on both sides of the partition body; and the spherical body. A swinging shaft having one end fixed to the pump casing and the other end protruding outside the pump casing to perform a conical motion; a pump drive which is attached to the outer end of the swinging shaft and has a conical surface formed on the outer periphery. a disc; a diaphragm provided in a fluid-tight manner between the drive disc and the pump casing; a support shaft provided perpendicularly to an end of the drive shaft connected to the drive source; An oscillating pump comprising: a conical ring rotatably attached to a shaft and having a conical surface formed on its outer circumference pressed against the drive disk. (2) The oscillating pump according to claim 1, wherein the support shaft is attached so as to be slidable in the axial direction of the drive shaft.