SU66284A1 - Semi-mechanical type steam distribution mechanism for steam-air pumps - Google Patents

Description

The invention aims at eliminating the disadvantage inherent in the known semi-mechanical type steam distribution mechanisms, which consists in the fact that at the moment the pump pistons start to move upwards, when the variable-displacement valve should remain in the bottom position, there is a tendency to reverse the transfer of the valve to the upper position when the normal value of the pressure in the distribution chamber of the variable-displacement valve is changed; this can occur due to a delay in the beginning of the movement of P01 upwards with a significant amount of back pressure from other

PI.

According to the invention, this disadvantage is eliminated by the fact that the variable-displacement valve is made separate from the steam piston, which serves to move the valve from the upper to the lower position. The connection between the piston and the spool is one-sided. Therefore, if, for any reason, the piston is moved from the lower to the upper position, the spool will remain in its lower position and the pump will not be disturbed.

In FIG. il and I depict the scheme of the mechanism in positions corresponding to the motion of the pistons up and down.

The implementation of the mechanism is suggested by modifying the existing pumps from the steam distribution system, the decisive mechanism of the Westinghouse system.

In this alteration, the multi piston valve /, the main spool 9 and the auxiliary variable-displacement spool 4 remain i6e3 changes. The redesign is. that the end of the auxiliary spool rod is cut to the thickened part. Instead of the cap (plug) of the spool chamber, a new cap 5 with a piston is installed. Two channels 7 and 8 are connected to the cover 5. The channel 7 is connected to the lower part of the cylinder C15, at a distance of 34-35 mm from the edge of the mounting flange.

Steam from a steam boiler when the pump is operating enters the IB main distribution chamber between

discs 2 yi 3, as well as into the chamber C of the variable displacement valve. Fill the space between discs 2 and 3, steam (Moves the discs with spool & left | (fig. 1). On the W channel, the steam enters the BOTTOM cavity of the cylinder and the piston // goes up due to the fact that the upper cavity of the cylinder is heated through channel 12 and the valve 9 communicates with the atmosphere. The cavity S is constantly associated with the atmosphere. When the piston // moves upward, the cavity D communicates with the lower cylinder cavity, and cavity A with the atmosphere.

The piston and, reaching the upper extreme position, will push the outgoing part of the rod 13 and move the alternator slide 4 upwards; the latter will open the window of channel 14, leading to cavity A, and let in steam there. The channel 15 window at this time is disconnected from the atmosphere {FIG. 2). Therefore, the disks 5 and k3 move from the zolot-ksM 9 to the right, the spool 9 connects the lower cylinder hollow through the channel 10 with the atmosphere, and the upper hollow with the fresh steam channel 12, and the piston // goes down.

Both cavities D VI E also communicate with the atmosphere through channels 7 and S of the lower cavity of the cylinder.

When the piston /: /, comes to the extreme "left" position, the channel 16 will open, and the cavity D will communicate with C1 fresh steam through the channel 7 and the upper hollow of the cylinder. The cavity E at this time will still remain communicated with the atmosphere. Under pressure of fresh steam, the piston 6 moves to the lower position and with its shank will move the variable-displacement valve 4 also to the extreme lower position. When approaching the lowest position

Prashchen 6 opens the message through the channel 17 cavities above and below the piston, which causes it without. shock stop (due to pressure equalization.

In the lower position, the variable-displacement spool connects cavity A to the atmosphere. DIS1KI .2 and 5 with the spool 9 before ints in the left extreme position. In this case, the lower cavity of the cylinder communicates with the fresh steam via the liO channel, the upper cavity of the cylinder through the channel 12 - with the atmosphere, and the piston // under the pressure of the fresh steam goes up (Fig. 1).

Then the cycle repeats.

Subject invention

Claims (2)

1. A semi-mechanical type steam distribution mechanism for steam-air pumps consisting of a main spool producing steam distribution and a variable-displacement spool serving to actuate the main spool, characterized in that 6, serving for: transferring the variable-displacement spool to pressure (steam from the upper to the lower position with the lower position of the pump underside, in order to prevent the possibility of reverse transfer of the spool to the upper position, is made separate from the spool and kin is mathematically associated with one-way communication. 2. The steam distribution mechanism according to claim 1, characterized in that in order to prevent the blow from rotating at the end of the stroke 6 downward, a channel 17 is used, which opens at the end of the downward stroke of the piston and communicates cavities above and below the piston between them.