JP3163266B2 - Stroke adjustment device for reciprocating pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a stroke amount adjusting device applied to a reciprocating pump for performing a pump operation by reciprocating a diaphragm, a plunger, a bellows and the like.

[0002]

2. Description of the Related Art Conventionally, as means for adjusting the stroke amount of a reciprocating pump of this type, there is a device disclosed in Japanese Utility Model Application No. 60-160750.

That is, in this conventional adjusting means, a contact member engageable with a rotationally driven eccentric cam is screwed into a pump shaft. The stroke amount of the pump shaft is adjusted accordingly.

[0004]

However, in the above-mentioned prior art, since the adjusting means of screwing in and out of the contact member is employed, when the stroke amount is desired to be changed, a relatively large number of contact members are required. There was an adjustment problem that required rotation and lack of responsiveness.

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve the above-mentioned conventional problems, and enables the stroke amount of a pump shaft to be changed easily and quickly so that the desired discharge amount can be obtained quickly. It is an object to provide an excellent stroke amount adjusting device.

That is, a means adopted by the present invention to solve the above-mentioned problem is to provide an annular portion and an extension extending from the annular portion to one end.
And a pump shaft having one end connected to the pump unit.
Shaft and the other end of the annular portion of the pump shaft.
And one end is locked to the annular portion and the other end is fixed.
And a coil spring (22), an eccentric cam that engages in order to forward the pump shaft (17) at the rotationally driven and the pump unit <br/> discharge stroke the pump shaft (17) (23), An adjusting cam provided on the pump shaft (17) and engaged with the eccentric cam (23) to return the pump shaft (17) against the urging force of the coil spring during a pump part suction stroke. (26), wherein the adjusting cam (26) is
A shaft portion (27) rotatably fitted to the pump shaft,
A plurality of engagement surfaces (3
0), and rotating the adjustment cam around the shaft portion,
The eccentric cam (23) and to change the engagement surfaces that match engagement (30) in a point which is configured so as to adjust the stroke volume of the pump shaft (17).

Accordingly, in the reciprocating pump provided with the stroke amount adjusting device according to the invention, the pump shaft 17 is reciprocated by the eccentric cam 23 which is driven to rotate to perform the pump operation.

That is, in the suction stroke, the eccentric cam 23 engages with the adjusting cam 26 to move the pump shaft 17 backward, while the eccentric cam 23 in the discharge stroke after the end of the suction stroke.
23 is engaged with the pump shaft 17 and moved forward.

When adjusting the stroke of the pump shaft 17, the adjusting cam 26 is rotated to rotate the eccentric cam 23.
By changing the engagement surface 30 with the pump shaft 17
The return distance in the suction stroke is changed, and the stroke amount can be adjusted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

1 and 2, reference numeral 1 denotes a pump unit 2,
FIG. 2 shows a reciprocating pump including a driving unit 3, a driving transmission unit 4, and a stroke amount adjusting unit 5. The pump unit 2 includes a diaphragm 8 that reciprocates a pump chamber 7 in a pump head 6.
The fluid is sucked from a suction hole 9 communicating with the pump chamber 7 and can be discharged to the outside from a discharge hole 10. Reference numeral 11 denotes a check valve housed in the suction hole 9 and the discharge hole 10, respectively.

Reference numerals 12 and 13 denote a motor and a speed reducer constituting the drive unit 3, which are respectively housed in a pump case 14. A rotary shaft 15 of the speed reducer 13 has a through hole 16 formed in an upper surface of the pump case 14. From the outside.

Reference numeral 17 denotes a pump shaft having one end connected to the diaphragm 8, and the other end slidably supported by a bearing 18 provided on the upper surface of the other end of the pump case 14. An annular portion 19 is provided at substantially the center of the annular portion 19, and a plate-like mounting portion 21 having a circular hole 20 is protruded from the lower inner peripheral surface on the other end side of the annular portion 19.

A coil spring 22 is inserted between the other end of the pump shaft 17 and the annular portion 19 and the bearing 18. The elastic force of the coil spring 22 urges the pump shaft 17 toward one end. ing.

Reference numeral 23 denotes an eccentric cam configured to engage with the inner peripheral surface of one end of the annular portion 19 so as to move the pump shaft 17 to one end.
An eccentric cam portion 24 fixed to the rotating shaft 15 of the thirteenth embodiment and a ball bearing 25 which is externally fitted to the upper end of the eccentric cam portion 24 and can engage with the annular portion 19, as shown in FIG. Center O of cam part 24
Is e (the amount of eccentricity) from the rotation center O 'of the rotation shaft 15 of the speed reducer 13
Only eccentric. The drive transmission unit 4 is made up of each of the above members.

Numeral 26 denotes an adjusting cam in which a shaft 27 projecting from the lower end is rotatably fitted into the circular hole 20 of the pump shaft 17, and its outer periphery has a plurality of square portions 28 and an arc-shaped portion 29 as shown in FIG. The ball bearing 25 of the eccentric cam 23 is engaged with the engagement surface 30 during the pump suction stroke, and the pump shaft
17 is moved back by a predetermined amount.

Each engaging surface 30 of the square portion 28 of the adjusting cam 26
Is formed in a polygonal shape such that the distance from the center O ″ of the shaft portion 27 decreases by 10%, and the largest distance L
The stroke amount of the pump shaft 17 is maximized at the engagement surface 30a set to the above, and the stroke amount is 50% of the maximum stroke amount at the intermediate engagement surface 30b, that is, the distance L 'obtained by subtracting the eccentricity e from the distance L. The engagement surface 30b is formed, and the stroke amount is 20% of the maximum stroke amount on the smallest engagement surface 30c. Further, the engaging surface 30d of the arcuate portion 29
L ″ between the distance O and the center O ″ is 2
The stroke amount of the pump shaft 17 becomes 0, and the pump operation is not performed.

Reference numeral 31 denotes a dial fixed on the upper surface of the adjusting cam 26 with a screw 32 so that the axis thereof is aligned with the shaft 27, and a scale (not shown) on the upper surface thereof in accordance with the shape of the adjusting cam 26.
Is displayed, and a number of fitting holes 33 are formed on the lower surface at predetermined intervals in the circumferential direction and concentrically with the shaft portion 27.

Reference numeral 34 denotes a mounting piece protruding from an upper inner peripheral surface on one end side of the annular portion 19 of the pump shaft 17, and a ball 36 is provided on a cylindrical body 35 provided on the upper surface thereof via a coil spring (not shown). Part of it protrudes outside and is fitted so that it can come and go,
The ball 36 is configured to be able to be fitted into and removed from the fitting hole 33 of the dial 31 to prevent the dial 31 from being accidentally rotated.

The present embodiment includes the above specific items, and the basic pump operation is performed as follows.

That is, during the pump discharge stroke, the eccentric cam 23 driven to rotate by the motor 10 via the rotary shaft 15 of the speed reducer 13 is used.
Engages with the inner peripheral surface on one end side of the annular portion 19 of the pump shaft 17, the pump shaft 17 is pressed to one end side and moves forward, and the fluid in the pump chamber 7 is discharged by the diaphragm 8 through the discharge hole.
Discharged from 10.

On the other hand, during the pump suction stroke, the eccentric cam 23, which is rotationally driven, engages with the predetermined engagement surface 30 of the adjusting cam 26, and the pump shaft 17 moves toward the other end against the elastic force of the spring 22. The fluid is sucked into the pump chamber 7 from the suction hole 9 by the diaphragm 8.

Then, for example, as shown in FIG.
If the engagement surface 30a of the eccentric cam 23 is set to engage with the eccentric cam 23, the eccentric cam 23, the pump shaft 17 and the adjustment cam 26
Is always maintained, the stroke amount S of the pump shaft 17 becomes twice the eccentric amount e by the rotation of the eccentric cam 23 as shown by the two-dot chain line, and the discharge amount of the pump is also maximized. Becomes

In this state, in order to change the stroke amount S of the pump shaft 17, the adjusting cam engaged with the eccentric cam 23 is used.
What is necessary is just to change the engagement surface 30 of 26. That is, when the dial 31 is gripped and a rotational force is applied while referring to the scale, the ball 36 is detached from the predetermined fitting hole 33 of the dial 31 and the adjustment cam is released.
26 can rotate to change its engagement surface 30.

More specifically, when the stroke amount S is changed to 50%, for example, as shown in FIG. 5B, the engagement surface 30b of the adjustment cam 26 is moved to a position facing the eccentric cam 23. Turn the dial 31. In this state, the ball 36
Is fitted into the other fitting hole 33 of the dial 31, and the dial 31 is locked.

Thus, the engagement surface 30 of the adjusting cam 26
b, the eccentric cam at the end of the pump suction stroke
Since a gap corresponding to the eccentricity e is formed between the pump shaft 17 and the pump shaft 17, the stroke amount S of the pump shaft 17 is adjusted to 50%, and the discharge amount of the pump is also reduced by half.

Further, the dial 31 is rotated to adjust the adjustment cam.
If the engaging surface 30c formed by the 26 arcuate portions 29 is opposed to the eccentric cam 23, the gap becomes twice the amount of eccentricity e, and the eccentric cam 23 idles as shown by a two-dot chain line in FIG. Therefore, the stroke amount S of the pump shaft 17 becomes 0, and the pump operation is not performed.

Incidentally, such a series of adjustment operations can be performed not only when the pump is stopped but also during operation.

Since the adjusting cam 26 is used as the stroke amount adjusting means, the adjusting cam
With a very simple operation of slightly rotating the 26, it has the responsiveness that the desired stroke amount can be quickly adjusted.

A ball 36 provided on the pump shaft 17 is fitted and locked in the fitting hole 33 of the dial 31 and each engaging surface 30 of the adjusting cam 26 which engages with the eccentric cam 23 has a predetermined shape. Because of the width, the stroke amount can be accurately adjusted, and the adjusted stroke amount is reliably maintained, so that the dial 31 is inadvertently rotated to change the stroke amount. Nothing.

Furthermore, the stroke amount adjusting device according to the present embodiment is very simple in the overall specification,
There is also an advantage that it can be manufactured easily and at low cost.

In the above embodiment, the adjusting cam 26 having the square portion 28 and the arc portion 29 is used. However, the present invention is not limited to this, and the arc portion 29 may be changed to a straight line. The adjusting cam 26 may be polygonal in shape, for example, as shown in FIG.
A cylindrical eccentric cam in which the engagement surface 30 is formed in a curved shape as described above, or a cam in which the engagement surface 30 is formed in a special curved shape as shown in FIG.

When the stroke amount is adjusted stepwise as in the above embodiment, the specific increase / decrease rate is not limited to 10% of the embodiment and can be changed as appropriate.

In addition, the specific items of the pump unit 2, the drive unit 3, the drive transmission unit 4 and the like are not limited to the above embodiment, and the stroke amount adjusting device according to the present invention is different from the reciprocating pump. It goes without saying that it can be widely applied.

[0035]

As described above, since the present invention employs an adjusting cam that engages with a rotationally driven eccentric cam as a stroke amount adjusting means of the pump shaft, the engagement surface is changed. The stroke amount of the pump shaft can be quickly adjusted by a very simple operation, and its responsiveness is significantly greater than the conventional one that uses a contact member screwed to the pump shaft as the stroke amount adjusting means. It has a special effect that it will be improved.

Further, in the invention according to claim 2, wherein
A cylindrical body provided on the upper surface of the pump shaft and a coil bar
Through the cylindrical body so that a part thereof projects outside.
A ball fitted into and retractable from a shaft of the adjusting cam;
A dial fixed with its axis centered on
Has a plurality of fitting holes into which the balls are removably fitted.
Perforated on the concentric circle with the shaft with a predetermined interval in the circumferential direction
Adjusted straws by providing
The dial is rotated carelessly as the amount of rotation is maintained
And the stroke amount changes.
No.

Also, as in the invention according to claim 3,
Adjust the adjustment cam with the maximum distance from the center of the shaft (27).
Corner where the mating surface (30a) and the intermediate engaging surface (30b, 30c) are formed
An arc-shaped part on which a shape part (28) and the minimum engagement surface (30d) are formed
(29), the engagement with the eccentric cam
Accuracy of the stroke amount
It can be adjusted and can be used for adjustment operation.
It has a significant effect. Further, as described above, the stroke amount adjusting device according to the present invention has a practical effect that it can be easily and inexpensively manufactured because the entire specified items are very simple.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a reciprocating pump provided with a stroke amount adjusting device according to the present invention.

FIG. 2 is a sectional plan view of the same.

FIG. 3 is an enlarged plan sectional view of a main part of FIG. 2;

FIG. 4 is a plan view showing a cam portion of the adjustment cam.

FIGS. 5A to 5C are enlarged plan cross-sectional views of a main part showing a state in which a stroke amount is adjusted.

6 (a) and 6 (b) are schematic perspective views showing another embodiment of the adjusting cam.

[Explanation of symbols]

 17 ... Pump shaft 23 ... Eccentric cam 26 ... Adjusting cam 30 ... Engagement surface O "... Rotation center

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F04B 9/04

Claims (3)

(57) [Claims] An annular portion extending from the annular portion toward one end;
And a pump shaft having one end connected to the pump unit.
Shaft (17) , disposed on the other end side of the annular portion of the pump shaft, one end
Coil whose part is locked to the annular part and whose other end is fixed
A spring (22), an eccentric cam (23) that is driven to rotate and engages with the pump shaft (17) to reciprocate the pump shaft (17) in a pump part discharge stroke; and the pump shaft (17). The eccentric cam (2) is provided to move the pump shaft (17) backward against the urging force of the coil spring (22) during the pump part suction stroke.
3) it from the adjusting cam for engagement (26), the said adjustment cam (26) is rotatably fitted to the shaft portion to the pump shaft (27)
And a plurality of engagement surfaces (3
0), the adjustment cam is rotated around the shaft, and the eccentric cam
(23) and the stroke amount adjusting for reciprocating pump engagement surfaces that match engagement (30) by changing the characterized by comprising is configured so as to adjust the stroke volume of the pump shaft (17) apparatus. 2. A pump provided on an upper surface of the pump shaft (17).
Part is externally connected to the cylindrical body (35)
It is removably fitted into the tubular body (35) so as to protrude.
The ball (36) and the shaft (27) of the adjustment cam were fixed so that their axes were aligned.
A dial, on the lower surface of which the ball can be freely inserted and removed.
The plurality of fitting holes to be fitted are provided at predetermined intervals in a circumferential direction.
It has a shaft (27) and a dial formed concentrically.
The stroke amount adjusting device for a reciprocating pump according to claim 1, wherein 3. The control cam according to claim 1 , wherein said adjusting cam is located at a center of said shaft portion (27).
The distance between them is the largest (30a) and the middle (30b, 3
0c) is formed square portion (28), the minimum engagement surface (30d)
And an arc-shaped portion (29) formed with
The stroke amount adjusting device for a reciprocating pump according to claim 1 or 2 .