JPH0449865U

JPH0449865U -

Info

Publication number: JPH0449865U
Application number: JP9135790U
Authority: JP
Priority date: 1990-08-30
Filing date: 1990-08-30
Publication date: 1992-04-27

Description

[Brief explanation of the drawing]

第１図は本考案のフローセンサーの１実施例を
示す断面図、第２図は同実施例に用いたシリンダ
金具の拡大斜視図、第３図イ，ロは同実施例にお
けるマグネツトの移動状態を示す説明図、第４図
イ，ロ，ハは同実施例におけるピストンの前進工
程を示す説明図、第５図イ，ロ，ハは同実施例に
おけるピストンの後退工程を示す説明図、第６図
は同実施例における連通路及びバイパス路の形成
位置の相互関係を示す説明図、第７図は従来例で
ある。１ａ……貫通孔、１ｂ……一端側、１ｃ……他
端側、２……シリンダ金具、２ａ……大径部、２
ｂ……小径部、２ｃ……ピストン嵌合孔、２ｄ…
…連通路、２ｅ……バイパス路、３……ピストン
、３ａ……一端面、４……空間、５……バネ、６
……マグネツト、７……センサ保持孔、８……リ
ードスイツチ、９……感知部、１０，１１……雌
ネジ、１２……突壁、１３……流出孔、１４……
流出路、１５……支持具。 Fig. 1 is a sectional view showing one embodiment of the flow sensor of the present invention, Fig. 2 is an enlarged perspective view of the cylinder fitting used in the embodiment, and Fig. 3 A and B are the moving states of the magnet in the same embodiment. FIGS. 4A, 4B and 4C are explanatory views showing the forward movement of the piston in the same embodiment. FIGS. FIG. 6 is an explanatory diagram showing the mutual relationship between the formation positions of the communicating path and the bypass path in the same embodiment, and FIG. 7 is a conventional example. 1a...Through hole, 1b...One end side, 1c...Other end side, 2...Cylinder fitting, 2a...Large diameter part, 2
b...Small diameter part, 2c...Piston fitting hole, 2d...
...Communication path, 2e...Bypass path, 3...Piston, 3a...One end surface, 4...Space, 5...Spring, 6
... Magnet, 7 ... Sensor holding hole, 8 ... Reed switch, 9 ... Sensing part, 10, 11 ... Female screw, 12 ... Projection wall, 13 ... Outflow hole, 14 ...
Outflow channel, 15... support.

Claims

[Scope of Claim for Utility Model Registration] Inside a through hole provided in a casing, a detected object made of a magnet or having a magnet inside is installed, which moves back and forth according to the flow of viscous fluid flowing inside the through hole, In addition, this detected object is urged toward one direction by a return spring, and
A flow sensor in which a magnetic detection means such as a reed switch or a Hall element is arranged adjacent to the through hole and detects the flow of fluid by detecting the back and forth movement of the magnet by the magnetic detection means, the flow sensor is provided in the casing 1. One end side 1 of the through hole 1a
A cylinder fitting 2 into which a piston 3 with one end surface 3a as a pressure-receiving surface is fitted is inserted and fixed in b, and a magnet 6 having a diameter smaller than that of the through hole 1a is inserted from the other end side 1c of the through hole 1a. , this magnet 6
A spring 5 is sequentially inserted to bias the piston 3 toward one end, and a magnet 6 presses the piston 3, and a small diameter portion 2b formed on the outer circumference of the cylinder fitting 2 is formed between the outer surface of the small diameter portion 2b and the inner circumferential surface of the through hole 1a. The space 4 where the piston 3
slides a certain distance X, the piston fitting hole 2c
A communication passage 2d that communicates the inner space with the space 4 is provided in the cylinder metal fitting 2, and a space is provided between the inner space of the piston fitting hole 2c and the space at a position a certain distance S away from the communication passage 2d toward the one end side 1b. 4. A flow sensor characterized in that a bypass passage 2e having a smaller cross-sectional area than the communication passage 2d communicating with the flow sensor 4 is provided.