SU1368482A1 - Pump - Google Patents

Abstract

The invention relates to pump construction and allows to increase the reliability of operation. The drive of the return sleeve 9 to the seat 8 is complete in the form of control strips 11 communicated via the overflow 15 and the annular 13 holes with the suction line 12. At the beginning of the suction stroke, a joint movement occurs piston (П) 4 and bushings 9, which improves the operating conditions of seal П 4. When executed, the SRI in P 4 of the channel provides enhanced tightness of seal П 4 as a result of its communication with the working cavity 3. 1 Cp. f-ly, 3 ill.

Description

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The invention relates to the technology of | Pumping and can be used, in particular, in the design of piston pumps.

The aim of the invention is to increase the reliability of operation.

Figure 1 shows the principle of the pump in figure 2 - the same, JKOpnyc is complete with a spring-loaded | crack from the stem; on fig.Z - the same, the piston, is executed with the channel informing a working cavity with piston consolidation

The pump contains a cylinder 2 rigidly mounted in housing 1 with a piston 4 placed therein with the formation of a working cavity 3, which is kinematically connected to a drive (not shown) through a rod 5 connected to it and passed through the housing 1.

The working cavity 3 communicates with the discharge line 6. through the discharge valve 7, the reverse side of which serves as the seat 8 of the suction valve made in the vice piston 4 of the sleeve 9, fitted with a mouth 10 located in the working cavity 3 relative to the cylinder 2 and the piston 4 and having a drive for returning it to the saddle 8, made in the form of a control cavity 11 formed between the cylinder 2 and the rod 5.

The working cavity 3 is communicated through the annular gap between the seat 8 and the neck 10 of the sleeve 9 with the suction: 1 highway 12 ...

In the exit zone of the shaft 5 of the housing 1, the annular hole 13 is threaded, the piston 4 from the side of the rod 5 is from-: & the annular hole 13 of the shoulder Il4 with the possibility of blocking from 10

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In addition, in the piston 4, the channel 17 can be connected connecting the piston 4 with the working cavity 3. g The pump operates as follows.

When the piston moves towards the control cavity 11, the pressure in the working cavity 3 decreases, and the discharge valve 7- closes. U The fluid from the control cavity 11 through the holes 13 and 15 flows into the suction line 12, the pressure in the latter increases, and the sleeve 9 under the action of the forces of friction and force determined by the pressure differential in the working cavity 3 and the control cavity 11 moves

The working cavity 3 flows mainly liquid displaced from the control cavity 11, as well as liquid from the suction line 12, the volume of which is equal to the difference between the volumes of the working cavity 3 and the control cavity 11, which provides a slight change in the suction pressure during suction line 12. With further movement of the sleeve 9 closes the lateral bypass hole 15, there is an increase in 30 pressure in the control cavity 11 and slowing down the movement of the sleeve 9, when approaching the extreme position of interaction Tweaks with the housing 1 (Fig. 1) or with the lid 16 (Fig. 2) and stops.

At the end of the stroke of the piston 4, the collar 14 closes the annular opening 13, which causes an increase in pressure in the closed control cavity 11 and re-. moving the sleeve 9 in the direction of the working cavity 3 and the separation of the working cavity 3 and the suction line 12,

At the beginning of the movement of the piston 4 in the direction of the working cavity 3 sleeve 9

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: Wister 13 at the extreme position of the piston 45 Additionally pressed against the seat 8 4, in the cylinder 2 - at least :-) one side bypass opening 15 with the possibility of blocking it with the sleeve 9, and the control cavity 11 Communicated through the bypass 15 and the ring - Hole 13 holes with a suction ma- chine: a cutter 12. Housing 1 in the ijuToKa exit zone can be equipped with a shank 16 (FIG. 2) mounted on the hull 1 and spring-loaded relative to it, the drich cover 16 is installed with the possibility of forceful interaction with the sleeve 9 when its extreme position.

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arising between the piston 4 and the sleeve 9 friction forces.

With increasing pressure in the working cavity 3, the discharge valve 7 opens and the fluid from cavity 3 flows into the discharge line 6.

When the piston 4 is moved, the control cavity 11 is communicated through the annular opening 13, and then through the bypass opening 15 with the suction pipe 12 and the filling of the control cavity 11 of the liquid.

pressed against saddle 8

arising between piston 4 and vtula 9 friction forces.

With increasing pressure in the working cavity 3, the discharge valve 7 opens and the fluid from cavity 3 flows into the discharge line 6.

When the piston 4 is moved, the control cavity 11 is communicated through the annular opening 13, and then through the bypass opening 15 with the suction pipe 12 and the filling of the control cavity 11 of the liquid.

When approaching the extreme position, the piston 4 is stopped and the injection of fluid into the injection line 6 is stopped. Then the cycle repeats.

At the beginning of the asymptomatic stroke, the piston-4 and the sleeve 9 move together, which improves the working conditions of the seal 4.

When a channel 17 is made in the piston 4, the piston 4 is tightly sealed by communicating it with the working cavity 3.

Claims (2)

1. A pump containing a cylinder rigidly mounted in the housing with a piston placed in it to form the working cavity, which is kinematically connected to the drive through a rod connected to it and passed through the housing, while the working cavity communicates with the discharge line through the discharge valve the reverse side of which serves as the seat of the suction valve, made in the form of a piston sleeve, fitted with a working cavity of the throat. installed movably relative to the cylinder and piston and having a drive for its return to the saddle, and the working cavity communicates through an annular gap between the saddle and the neck of the sleeve with the suction line, characterized in that, in order to increase the reliability operation, the drive return sleeve to the saddle is made in the form of a control cavity formed between the cylinder and the stem, the exit zone of the rod from the body is made annular elongation / In the piston, from the side of the rod, the collar meets the annular opening with the possibility of overlapping the opening with the piston in the extreme position; in the cylinder, at least one lateral overflow opening with the possibility of blocking it with the sleeve; and the control cavity communicates through the bypass and the annular opening with the suction backbone. 2. Pump pop. 1, which differs from the fact that the body in the exit zone of the rod is fitted with a bolt mounted on the body and is spring-loaded relative to it, with the cover Tanovlena with the possibility of force interaction with the sleeve in its extreme position. (