JPS6269081U

JPS6269081U -

Info

Publication number: JPS6269081U
Application number: JP16161785U
Authority: JP
Priority date: 1985-10-22
Filing date: 1985-10-22
Publication date: 1987-04-30
Also published as: JPH025104Y2

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例に係るポンプ装置
の縦断面図、第２図はポンプ装置における駆動時
間と発生負圧との関係を示すグラフ、第３図は本
考案の第２実施例に係るポンプ装置の縦断面図で
ある。符号の説明、１０…ポンプハウジング、１５ａ
，１５ｂ…シリンダ部、２０，２０Ａ…作動ピス
トン、２１…ピストン本体、２２，２７…コンロ
ツド、２６ａ…ピストン部、２６ｂ…ロツド部、
３１〜３５，３２Ａ…チエツクバルブ、Ｒ１〜Ｒ
３…ポンプ室、Ｒ４…容積可変室。 FIG. 1 is a vertical cross-sectional view of a pump device according to a first embodiment of the present invention, FIG. 2 is a graph showing the relationship between drive time and negative pressure generated in the pump device, and FIG. 3 is a second embodiment of the present invention. FIG. 2 is a longitudinal cross-sectional view of a pump device according to an example. Explanation of symbols, 10...Pump housing, 15a
, 15b... Cylinder part, 20, 20A... Working piston, 21... Piston body, 22, 27... Connecting rod, 26a... Piston part, 26b... Rod part,
31~35,32A...Check valve, R1~R
3...Pump chamber, R4...Variable volume chamber.

Claims

[Scope of utility model registration request]

A piston part of an operating piston is fitted into a cylinder part provided inside the pump housing so as to be slidable in the axial direction in an airtight manner, thereby forming a pump chamber which is opened and closed by a suction check valve and a discharge check valve. At the same time, the rod portion of the actuating piston is connected to a pump drive shaft, and the rotation of the drive shaft causes the actuating piston to slide, and the negative pressure and positive pressure generated in the pump chamber are used as a driving source for the actuator. A piston sliding type pump device provided as a piston sliding pump device, wherein the pump chamber is connected to the actuator side, and first and second pump chambers are configured to expand and contract differently when the actuating piston slides; a third pump chamber that communicates with both pump chambers, communicates with the atmosphere, and contracts and expands in contrast to the expansion and contraction of either one of the pump chambers when the actuating piston slides; First and second check valves are provided in each communication portion between the actuator side and the first and second pump chambers, and the first and second check valves have different opening and closing operations when the actuating piston slides. A third check valve, which opens and closes differently from the first check valve when the working piston slides, is provided in a communication portion between the pump chamber and the first pump chamber. A fourth check valve whose opening/closing operation is different from that of the second check valve is provided in the communication portion between the third pump chamber and the atmosphere, and a fourth check valve is provided in the communication portion between the third pump chamber and the atmosphere. The piston sliding type pump device is characterized in that a fifth check valve is provided which opens and closes differently from the third or fourth check valve when the operating piston slides.