An on-off valve for controlling the on-off of the energized circuit of a powered air-supply respirator

Abstract

The invention discloses a switching valve with a power on-off function and used for a dynamic air supply respirator. The switching valve comprises a turning-on / off hand wheel, a valve cover, an eccentric cam, a microswitch, a valve element, a valve body and an elastic element. When the turning-on / off hand wheel is located at a locking station, a limit boss is arranged in a notch correspondingly, and the valve cover thus stops the turning-on / off hand wheel from rotating around the self axis; when the turning-on / off hand wheel is pressed in the axial direction of the turning-on / off hand wheel, the elastic element is compressed, the limit boss is disengaged from the notch, thus, the turning-on / off hand wheel rotates around the self axis, at the moment, slide blocks abut against the interiorsof eccentric cam slide grooves and valve element slide grooves correspondingly, therefore, the eccentric cam and the valve element are driven to rotate synchronously, when the turning-on / off hand wheel rotates to an turning-on station, a protruding portion of the eccentric cam is rotated synchronously to the position where the microswitch is pressed, therefore, an electric circuit is connected, and a conveying channel is opened; and when the turning-on / off hand wheel rotates to a turning-off station, the eccentric cam leaves the position of the microswitch, therefore, the electric circuit is disconnected, and the conveying channel is closed.

Description

technical field [0001] The invention relates to a switch valve, in particular to a switch valve used on a respirator. Background technique [0002] As a kind of respiratory protection equipment, powered air respirator can be used in fire protection, petroleum, chemical industry, heavy industry, sewage treatment, ship and other fields, and it is used for quick response personnel, firefighters, industrial workers and others who endanger life and health in an instant. To be worn by persons requiring respiratory protective equipment in hazardous environments. [0003] The working principle of the powered air-supply respirator in the prior art is as follows: [0004] When working, the fan is driven by the power supply, and the fan provides the staff with clean air of no less than 95LPM through the air supply pipe through the filtered air. During use, the operator needs to press the switch button of the battery box on the powered air-supplied respirator worn at the waist to turn...

AI Technical Summary

Problems solved by technology

However, due to wearing a mask, the operator's line of sight is blocked, so there is a blind spot in the line of sight, resulting in a longer time for accurately and quickly pressing the switch button of the battery box

In addition, the power-supplied air respirator in the prior art also has insufficient intuitive operation. For example, when used in combination with an air respirator, it is necessary to open and close the air supply pipe of the power-supplied respirator. The power-supplied air respirator in the prior art does not have an on-off valve, so when used in combination with an air-supplied respirator, the air supply pipe cannot be opened and closed, and because the power-supplied air respirator is usually worn on the back, it cannot be operated more conveniently turn on and off the fan

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