JPS5958299U - Dry flashback preventer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a vertical cross-sectional view in a normal use state, and FIG. 2 being a vertical cross-sectional view in a state where an abnormality occurs.

Claims (1)

[Scope of utility model registration request] A gas outlet pipe connecting portion 4 is formed on the peripheral wall 2 of the flashback preventer main body 1 formed with one end open, and a cutoff valve holder 5 is fitted inside the flashback preventer main body 1 to form a flashback prevention chamber 6. A flame extinguishing tube 7 is installed inside the flashback prevention chamber 6, a shutoff valve chamber 11 is formed inside the shutoff valve holder 5, and an outer end wall of the shutoff valve chamber 1.1 is formed with a gas introduction nozzle 10. The nozzle holder 12 is fitted into the open end of the flashback preventer main body 1 and screwed into the cutoff valve holder 5.
and the gas introduction nozzle 10 are configured to be fixed in position within the flashback preventer main body 1, and a shutoff valve body sliding hole 13 is provided in the inner end wall of the shutoff valve chamber 11 so that the shutoff valve body slides A shutoff valve seat 14 is formed on the peripheral wall of the opening of the hole 13 on the shutoff valve chamber side.
The leg portion 15a of the cutoff valve body 15 is inserted into the cutoff valve sliding hole 13.
The inside of the shutoff valve body 15 is housed in a state where it can freely slide forward and backward, and the shutoff valve body 15 is closed to the valve closing side by a shutoff valve spring 16 installed between it and the gas introduction nozzle 10, thereby preventing backfire inside the shutoff valve body 15. A gas communication hole 19 is formed from the side of the prevention chamber 6, and a through hole 20 provided through the leg peripheral wall of the cutoff valve body 15 allows communication between the cutoff valve chamber 11 and the flashback prevention chamber 6. A check valve seat 21 is formed at the end of the communication hole 19 on the side of the flashback prevention chamber, and a check valve body 22 is positioned opposite to the check valve seat 21. A sliding support hole 30 is formed in the end wall of the inner central space on the opposite side of the shutoff valve chamber 11, and a reset rod 23 is inserted into the sliding support hole 30 in the perspective direction with respect to the shutoff valve chamber 11.
A check valve spring 24 is arranged between the reset rod 23 and the check valve body 22 to press the check valve body 22 toward the closing side, and the reset rod 23 and the check valve body 22 are slidably supported. A click stop device 29 is interposed between the reset rod 2 and the hole 30.
3, the click stop device 29 is configured to allow switching movement between the reset position approaching the cutoff valve chamber 11 and the cutoff position moving away from the cutoff valve chamber 11. When the reset rod 23 is advanced to the reset position, the click stop device 2
9 position holding force causes the inner end surface of the reset rod 23 to close to the shutoff valve body 1.
5 to press and hold the shutoff valve body 15 in the closed position against the shutoff valve spring 16, and at the same time place the outer end surface of the reset rod 23 in a position where it does not protrude outside the sliding support hole 30. When the reset rod 23 is retracted to the shutoff position, the inner end surface of the reset rod 23 touches the shutoff valve body 1.
5 is no longer pushed to the valve open position, and the reset rod 23
A dry type percent type percent characterized in that the outer end surface is configured so that it is in a state where it advances to a position where it protrudes outside the sliding support hole 23.