Pumps – Motor driven – Fluid motor
Patent
1989-01-25
1991-03-26
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
91224, 91228, 91229, F04B 3500, F01L 1512, F01L 2104
Patent
active
050024680
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a switching device for a pump which is reciprocated by automatically switching the application and removal of fluid pressure.
2. Background Art
Conventional reciprocation switching devices for pumps typically call for, as described in Japanese Utility Model Publication No. 40805/1974 fitting a piston to the inside of the cylinder body so as to slide along the cylinder body; providing the said piston with two kinds of movable valves to control fluid pressure applied to one side of the piston and fluid pressure applied to the other side of the piston; and installing a valve operator at the center of the said piston to operate the two kinds of valves by snap-action by means of a spring working in relation to the reciprocating movement of the piston.
As a compressed coil spring is used for such a conventional device, it requires a spring fitting rod for attaching the spring; the structure that calls for so fitting this rod as to allow it to rotate around the valve operator installed at the center of the device; and a spring holder section so fitted to the said spring fitting rod as to slide against it and also to rotate around sections incorporated with the piston as one body. Therefore, such a conventional device presents a problem in that the assembling of those parts as described above is difficult and complicated and that the reduction of the cost is limited due to the numerous parts required.
Further, a known example of a conventional reciprocation switching device for a diaphragm pump is described in Japanese Patent Publication No. 23303/1967.
A device under the said patent consists of, as shown in FIG. 16, switching mechanism section 512 provided inside switching device body 511; working rod 515 inserted through said switching mechanism section 512 and reciprocated by working fluid supplied to and exhausted from two working fluid chamber 513 and 514 by turns; switching operator 519 so fitted between the larger diameter section 516 of said working rod 515 and sleeve 517 as to be able to move and be moved to one side or to the other side of switching valve chest 518; cavity-shaped switch 521 that is switched by said switching operator 519 and switches supply and exhaust to and from two working fluid chambers 513 and 514 of working fluid supplied to switching valve chest 518; and spring 522 to hold switching operator 519 at one side or the other side of switching valve chest 518 by applying spring pressure perpendicular at the neutral point to said switching operator 519.
Such conventional devices further call for moving switching operator 519 by means of reciprocating movements of working rod 515; sliding switch 521 by said switching operator 519; controlling supply and exhaust of working fluid (the air) from and to the two working fluid chambers (air chambers) 513 and 514; and continuously reciprocating working rod 515.
Diaphragms 523 and 524 are a part of both ends of said working rod 515. These diaphragms 523 and 524 partition the chambers to form said working fluid chambers 513 and 514 and pump chambers 525 and 526. As said working rod 515 moves, volumes of said pump chambers 525 and 526 change, thus creating pumping strokes. For example, in case working rod 515 moves towards the right, the liquid contained in chamber 525 at one side of the device is pushed, by volume contraction of said pump chamber 525, out of discharge port 528 through check valve 527 at the discharging side. Meanwhile, the liquid is sucked, by volume augmentation of pump chamber 526 at the other side, out of suction port 529 into said pump chamber 526 through check valve 530 provided at the suction side. Such right and left pumping action is repeated by turns by the automatic switching of working fluid at said switching mechanism section 512.
In such conventional reciprocation switching devices, the configuration for the spring to apply pushing pressure to switching operator 519 calls for attaching cylindrical slider 531 to one end of compressed coil spring 522; inse
REFERENCES:
patent: 3094938 (1963-06-01), Blomeke et al.
patent: 4558715 (1985-12-01), Walton et al.
patent: 4879943 (1989-11-01), Grach
Murata Minoru
Yamada Kazumasa
Morrison Thomas R.
Savio, III John A.
Smith Leonard E.
Yamada Yuki Seizo Co., Ltd.
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