A three-way valve driven by a pin shaft

Abstract

The invention provides a three-way valve driven by a pin shaft, which belongs to the technical field of valves. A three-way valve driven by a pin shaft includes a valve body, a valve stem and a cover plate; the present invention provides a cover plate between the valve body and the valve stem, and the cover plate is sleeved on the valve stem, and at the same time, the cover plate It has a rotating inner chamber with a protrusion, and the protrusion protrudes along the axial direction of the valve stem. The protrusion has a plane and a slope connecting the plane and the bottom of the rotating inner chamber. The valve stem is provided with a pin shaft along its radial direction. The opening and closing control of the three-way valve is realized through the contact between the pin shaft and the protrusion, and the contact surface is all the outer surface, which effectively avoids the problem of control failure such as jamming caused by slight deformation of the structure, and has better reliability. In addition, the cover plate is provided with a limit hole that runs through the raised plane and has built-in balls and compression springs, so as to realize the limit of the pin shaft on the raised plane and prevent the valve stem from automatically returning to its position. The problem of opening failure, better meet the conditions of use of the emergency switch.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a three-way valve driven by a pin shaft. Background technique [0002] In large vehicles such as buses and buses, in order to ensure the safety of passengers, emergency switches are often set at the doors, sunroofs and other structures to ensure that in the event of a safety accident, the doors, sunroofs and other structures can be opened through the emergency switch. To facilitate escape, therefore, the reliability of the emergency switch is particularly important. [0003] At present, the emergency switch on most large vehicles is a three-way valve, which can open and close the valve by controlling the rotation of the valve stem, so as to realize the pressure relief operation of the cylinder and other structures connected to it, so as to avoid the cylinder and other structures continuing to oppose the door. Therefore, ensuring the reliability of the three-way valve is the prima...

AI Technical Summary

Problems solved by technology

However, in emergency situations such as safety accidents, the valve stem or valve body is prone to slight deformation, resulting in changes in the pitch of the threads on the valve stem or valve body. The problem of the three-way valve makes it impossible to control the opening and closing of the three-way valve, and the reliability is low. In addition, after the manual start, there will be the problem of automatic return to cut off the channel, which will cause the opening failure, and it is difficult to meet the use requirements of the emergency switch.

Images