JPH0359491U

JPH0359491U -

Info

Publication number: JPH0359491U
Application number: JP11933389U
Authority: JP
Priority date: 1989-10-12
Filing date: 1989-10-12
Publication date: 1991-06-12

Description

[Brief explanation of the drawing]

第１〜３図は本考案の第１実施例を示すもので
、第１図、第２図はそれぞれのアンロード状態、
ロード状態を示す縦断面図、第３図は第２図のロ
ード状態を示す縦断面図、第３図は第１図のロー
ド状態の横断面図、第４図、第５図はその第２実
施例を示すもので、第４図はロード状態を示す縦
断面図、第５図は第４図のアンロードバルブの制
御回路図、第６〜８図はその第３実施例を示すも
ので、第６図、第７図はそれぞれそのロード状態
、アンロード状態を示す縦断面図、第８図は第７
図の分解斜視図である。第９図は公知のバキユー
ムポンプを示す縦断面図、第１０図は第９図のバ
キユームポンプを備えた自動車用エンジンの燃料
噴射量と燃費率との関係を示す線図である。１……励磁コイル、２……バイパス、３……ア
ンロードバルブ、４……圧力スイツチ、５……ロ
ーター、６……ローター、７……リングばね、８
……ベーン、９……給排油孔、０１……チエツク
バルブ、０２……ケーシング、０３……ローター
、０４……吐出口、０５……ベーン、０６……吸
込室、０７……圧縮室、０８……ダイナモ。 1 to 3 show the first embodiment of the present invention, and FIGS. 1 and 2 show the unloaded state,
3 is a vertical sectional view showing the loaded state of FIG. 2, FIG. 3 is a cross sectional view of the loaded state of FIG. 1, and FIGS. Fig. 4 is a vertical sectional view showing the loading state, Fig. 5 is a control circuit diagram of the unloading valve shown in Fig. 4, and Figs. 6 to 8 show the third embodiment. , FIG. 6, and FIG. 7 are longitudinal cross-sectional views showing the loaded state and unloaded state, respectively, and FIG.
FIG. 2 is an exploded perspective view of FIG. FIG. 9 is a longitudinal sectional view showing a known vacuum pump, and FIG. 10 is a diagram showing the relationship between fuel injection amount and fuel efficiency of an automobile engine equipped with the vacuum pump of FIG. 1... Excitation coil, 2... Bypass, 3... Unload valve, 4... Pressure switch, 5... Rotor, 6... Rotor, 7... Ring spring, 8
... Vane, 9 ... Oil supply and drainage hole, 01 ... Check valve, 02 ... Casing, 03 ... Rotor, 04 ... Discharge port, 05 ... Vane, 06 ... Suction chamber, 07 ... Compression chamber , 08... Dynamo.

Claims

[Scope of utility model registration request]

In a vacuum pump consisting of a cylindrical casing that eccentrically supports a rotor in which a plurality of movable radial vanes are arranged at equal intervals, there is a pressure sensor that detects the negative pressure in the vacuum tank, and the output of the pressure sensor. means for retracting the vanes all at once by supplying and discharging hydraulic pressure or excitation and demagnetization of an excitation coil, or for opening and closing an unload valve inserted in a bypass communicating the suction chamber and the compression chamber of the casing. An automatic load control device for a vacuum pump characterized by: