Three-way valve with pin shaft driving

Abstract

The invention provides a three-way valve with pin shaft driving, and belongs to the technical field of valves. The three-way valve with pin shaft driving comprises a valve body, a valve rod and a cover plate. The cover plate is arranged between the valve body and the valve rod, and the valve rod is sleeved with the cover plate; meanwhile, the cover plate is provided with a rotating inner cavity with a protrusion, the protrusion is arranged in the axial direction of the valve rod in a protruding manner, and the protrusion is provided with a plane and a slope for connecting the plane with the cavity bottom of the rotating inner cavity; and a pin shaft is provided on the valve rod in the radial direction of the valve rod. The opening and closing control of the three-way valve is implemented through contact between the pin shaft and the protrusion, and the contact surfaces are both outer surfaces, so that the problem of control failure such as jamming easily caused by slight deformation ofthe structure is effectively solved, and the reliability is higher; in addition, the cover plate is provided with a limiting hole which penetrates through the plane of the protrusion and is internally provided with a ball and an abutting spring, so that limiting of the pin shaft located on the plane of the protrusion is implemented, the problem of opening failure caused by automatic return of thevalve rod is solved, and the use condition of the emergency switch is better met.

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] On large vehicles such as buses and buses, in order to ensure the safety of passengers, emergency switches are often installed on the doors, skylights and other structures to ensure that the doors, skylights and other structures can be opened through the emergency switch in the event of a safety accident. 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. The valve is opened and closed by controlling the rotation of the valve stem, so as to realize the pressure relief operation of the structure such as the cylinder connected to it, and avoid the continuous impact of the cylinder and other structures on the door. , sunroof and other structures provide force and cause the door, ...

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.

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