RU24867U1 - CASEless OFFSETED SHUTTER VALVE WITH CURVED MOVEMENT TRAJECTORY - Google Patents

Description

made in the same way as the specified bellows, and the locking element is mounted on the movable plugs of all bellows.

Figure 1 shows the proposed shutter in axial section in a compressed state.

In FIG. 2 is a section along AA in FIG. 1.

In Fig.Z - the proposed shutter in the closed state.

The shutter contains a displacement actuator in the form of a bellows 1. The bellows shell 1 is sealed by its ends with two plugs 2, 3. The drawings show the welded bellows shell 1. The fixed plug 2 serves to mount the actuator and has a fitting 3 used to supply energy and create pressure in him. The movable plug 4 is sealed, and a locking element (valve) 5 with a sealing element 6 is installed on it. The valve seat 7 has a through hole (channel 8) (shown in dashed lines in FIG. 3).

The bellows 1 is made non-axisymmetric and consists of two parts, its corrugations have different depths on different sides, that is, the centers of the outer and inner circles of each corrugation do not coincide on each part of the bellows 1. The centers 9 of the inner circles of one part of the bellows 1 and the centers 10 of the inner circles of the other part of the bellows (as well as the axes passing through these centers) are offset from each other and in opposite directions from the axis 11 passing through the centers of the outer circles of the corrugations of both parts of the bellows.

The axis of the hole 8 of the seat 7 is offset relative to the axis of the locking element 5 in the compressed state of the bellows 1.

The shutter works as follows

When the energy carrier is supplied into the internal cavity of the bellows 1 through the nozzle 3 under the influence of pressure, the corrugations of the bellows 1 are stretched unevenly due to their different depths and, consequently, different stiffnesses from different sides, and the trajectory of valve 5 has the shape of arcs changing in sign of the radius of curvature. With the same length of parts

bellows 1 and equal distances between the centers of the outer and inner corrugations of the corrugations, these will be the conjugate arcs of circles of the same radius, twisting in different directions, while the ends of the bellows 1 (plugs 2 and 4) will be parallel both in a compressed and in a stretched state. The movable plug 4 is mixed; moves along a curved path (Fig. 3) towards the seat 7, the axis of the locking element 5 is displaced and the hole 8 is sealed with the locking element 5.

When the pressure of the energy carrier is removed, the bellows corrugations 1 are compressed, and the plug 4 with the locking element 5 is withdrawn from the hole 8.

The shutter may be slotted (not shown). If there is a slotted hole in the saddle, the displacement drive contains several similar bellows on which an elongated fixed plug is installed. With simultaneous supply of energy carriers to the bellows, they all stretch, bending to one side, the movable plug moves along a curved path and seals the slot hole.

The absence of significant reactive forces and low metal consumption make this valve open-frame, and in the case of using the welded shell of the bellows very compact.

Curvilinear movement and sufficient elongation of the bellows provide the shutter straightness.

The advantages of this shutter are high reliability, simplicity of design, compactness and low metal consumption. An important advantage is the absence of friction pairs of motion and, as a result, the absence of wear particles and high molecular weight hydrocarbon contaminants formed by lubricants.

This shutter can be used both in high pressure environments and for shutting off the volumes “atmosphere - atmosphere,” atmosphere - vacuum, “vacuum - vacuum. The absence of guides inside the bellows allows you not to contaminate wear products

energy carrier, as well as use a built-in pneumatic source based on the thermoelectric effect using hydrogen-storage alloys (START) as a means to create pressure.

This shutter can be used, firstly, in equipment for the production of electronic equipment, since there are no contamination with wear microparticles and high molecular weight hydrocarbon compounds; secondly, in vacuum equipment, since leakage through the bellows shell is negligible; thirdly, in aggressive environments, since the design is very simple and there are no friction pairs in it.

Claims (2)

1. A shutter comprising a saddle with an opening, a displacement actuator including a bellows, the fixed plug of which is configured to be connected with a means of creating pressure, a locking element is installed on the fixed plug, characterized in that the bellows is non-axisymmetric and in two parts so that in the compressed state of the bellows, the axis passing through the centers of the inner circles of the corrugations of one part thereof, and the axis passing through the centers of the inner circles of the corrugations of one part thereof, are offset from each other. 2. The shutter according to claim 1, characterized in that the saddle has a slotted hole, and the displacement actuator includes at least one additional bellows, made in the same way as the specified bellows, and the locking element is mounted on the movable plugs of all bellows.