JPS6245383U

JPS6245383U -

Info

Publication number: JPS6245383U
Application number: JP13799585U
Authority: JP
Priority date: 1985-09-09
Filing date: 1985-09-09
Publication date: 1987-03-19
Also published as: JPH0332791Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に係るバキユームポ
ンプの縦断正面図、第２図は同バキユームポンプ
の一部切欠側面図、第３図は第１ピストン部の拡
大部分縦断面図、第４図は同一部省略平面図、第
５図ａ，ｂは負圧室および圧力室のＰ―Ｖ線図、
第６図ａ，ｂは第１ピストン部の変形例を示す部
分縦断面図および平面図である。符号の説明、１０……ポンプハウジング、１６
ａ，１６ｂ……シリンダ部、２０……作動ピスト
ン、２１ａ，２１ｂ……ピストン部、２２……コ
ンロツド、３１……吸入用チエツクバルブ、３２
，３３……吐出用チエツクバルブ、４０……電動
モータ、Ｒ１……負圧室、Ｒ２……圧力室。 FIG. 1 is a longitudinal sectional front view of a vacuum pump according to an embodiment of the present invention, FIG. 2 is a partially cutaway side view of the vacuum pump, and FIG. 3 is an enlarged longitudinal sectional view of a first piston part. Figure 4 is a plan view with the same parts omitted; Figures 5a and b are PV diagrams of the negative pressure chamber and pressure chamber;
FIGS. 6a and 6b are a partial vertical sectional view and a plan view showing a modification of the first piston portion. Explanation of symbols, 10... Pump housing, 16
a, 16b...Cylinder part, 20...Working piston, 21a, 21b...Piston part, 22...Conrod, 31...Inhalation check valve, 32
, 33... Discharge check valve, 40... Electric motor, R1... Negative pressure chamber, R2... Pressure chamber.

Claims

[Scope of utility model registration request]

The piston part of the working piston is fitted airtightly and slidably in the axial direction into the cylinder part provided inside the pump housing, and a suction check valve and a discharge check valve are provided on one side of the piston part to generate negative pressure. 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 generated in the negative pressure chamber is transferred to the negative pressure actuator. In the piston sliding type vacuum pump, a second cylinder is provided inside the pump housing and is coaxial with the cylinder part and has a diameter different from that of the cylinder part.
a second piston portion that is fitted into the second cylinder portion airtightly and slidably in the axial direction;
A pressure chamber is formed between these two piston parts, and the pressure chamber is communicated with the atmosphere via a second discharge check valve, while the piston part is provided with a connection which communicates the negative pressure chamber and the pressure chamber. A piston sliding vacuum pump characterized in that a passage is provided and a flat valve is used as the discharge check valve, and the valve is interposed in the communication passage.