Laughing gas inlet valve

Abstract

The invention discloses a laughing gas inlet valve which comprises a valve body and a valve core, wherein the valve core is arranged in the valve body; the valve core comprises a valve head and a valve rod; a plurality of semi-round gas holes are uniformly formed in the outer circle of the valve head; the valve head is provided with a groove used for mounting a spring; the end surface at the top of the groove is the upper end surface of the valve core; the upper end surface of the valve core is provided with an inner edge line with an arc chamfer and an outer edge line with an arc chamfer; and an arc-shaped seal ring boss is arranged at the joint of the valve head and the valve rod. The cross section structure of the valve core is changed into a semi-round structure, so that the ventilation effect can be achieved, the convenience is provided for the mechanical processing operation, and the axial positioning effect is good; the inner edge line of the upper end surface of the valve core is rounded, so that the upper end surface of the valve core can be prevented from colliding with the spring; the outer edge line of the upper end surface of the valve core is rounded, so that the frictional force in the position where the outer edge line is contacted with the inner wall of the valve body can be reduced; and the position where the valve core is contacted with a seal ring is set to be arc-shaped, so that the phenomenon of excessive deformation due to long-term use of the seal ring can be avoided.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a nitrous oxide intake valve. Background technique [0002] When using an anesthesia machine, oxygen and nitrous oxide need to be mixed according to a predetermined ratio, and then delivered to the patient. During the use of anesthesia machines, the requirements for this ratio are very strict. Whether the concentration of oxygen or nitrous oxide is too high, it may affect the health of the patient, or even endanger life. The ratio of nitrous oxide to oxygen Accuracy is the key to the success of the operation, so even after the anesthesia machine has been used for a long time, it is required that the gas control valve of the anesthesia machine can accurately control this ratio. [0003] However, the control valves of existing anesthesia machines still cannot meet the above requirements. This is because the nitrous oxide intake valve in the control valve has been used for a long t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the valve core cannot be positioned, the valve core collides with the spring, the friction between the valve core and the valve body, and the deformation of the sealing ring is too large due to processing technology problems, and provides a nitrous oxide intake valve. , which has the advantages of simple structure, convenient use, long-term use of the sealing ring without failure, the output ratio of laughing gas within the required range, good axial positioning of the valve core and convenient processing.

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