The pressure regulator

 

(57) Abstract:

The invention relates to mechanical engineering and can be used in pneumohydrosystems vehicles. The invention allows to reduce the dimensions and weight and improve the reliability of the pressure regulator, which in the step of unloading the piston 19 is made of the axial channel 35 channel 36 of discharge has cuause-expanding flow profile, and the lower portion of the piston 19 has a concave profile and formed with a tapering part of the channel 35 injects channel and output channel 36 has a breather. 2 Il.

The pressure regulator belongs to the automotive industry and can be used to supply part of the pneumatic and pneumatic-hydraulic brake drive motor vehicles.

Known pressure regulators, for example, by ed. St. USSR N 1332279 and on the application [1] . the pressure regulator 100-3512010 production Roslavl auto-aggregate plant, the pressure regulator 11.3512010 production of Poltava automobile unit plant. Almost all pressure regulators ensure the unloading of the compressor into the atmosphere.

As a prototype the selected pressure regulator [2], comprising a housing with inlet and outlet cavities, razdelennogo elastic element, which connects the output cavity with a cavity discharge device that represents a spring-loaded piston-valve. Closing element of the valve separates the inlet chamber from the atmosphere. In the initial position of the servo piston is preloaded adjustable spring, with Cup-shaped bypass valve under the influence of the elastic force acts on the housing seat, according to the discharge cavity with the atmosphere.

Dust and aggressive forces in the internal cavity of the pressure regulator leads to rapid wear of parts, which leads to a decrease of the resource and reduce the reliability of the controller.

The purpose of the invention is to enhance reliability, increase resource and simplification (reduction of size and weight) of the controller.

The invention allows to exclude dust and corrosive environment in the inner cavity of the regulator, which reduces the wear and corrosion of parts, and it increases the life and reliability. The invention allows to simplify the controller and, hence, to reduce the dimensions and weight.

The invention consists in that the pressure regulator containing a discharge regulating device, comprising a servo piston in the axial Kahn is all open exhaust valve, and in the lower normally closed shut-off element of the inlet valve. The control piston comprises a stepped shaft, which is made through the channel. The coaxial arrangement of the pistons and execute end-to-end channel speed stock allow sealing spring cavity and simplify the regulatory and unloading device, to reduce the dimensions of the regulator. Running the profiled discharge channel of variable cross-section along the axis and shaped lower part of the stepped shaft allows you to organize the flow of air at the discharge of the regulator and the pressure relief mode of operation so that in the spring cavity creates a lower pressure at the discharge, which improves the performance of the controller, eliminates dust and corrosive environment, which ultimately increases the life and reliability of the regulator. Accommodation at the bottom of the cover into the discharge channel of the dust petal eliminates dust when broken regulator, and when the controller is in the mode of the pumping system, which improves the life and reliability of the controller.

In Fig. 1 shows a pressure regulator, a longitudinal section; Fig. 2 - node I in Fig. 1.

In case 1, reg is winandy servo piston 5, sealed in the housing ring 6. Its movement is limited by the protrusion of the casing 7. Witness the piston 5 is pressed against the end face of the housing 1 by a spring 8 by means of an adjusting screw 9, the current through the plate 10. The control piston 11 is pressed against the inner wall of the housing 1 by a spring 12 by means of an adjusting screw 13, acting on the plate 14. The control piston 11 in the upper part has a normally open exhaust valve, made in the form of a circular sealing ring 15, which is installed in the groove of the control piston 11, and pressed the G-shaped washer 16. In the lower part of the control piston 11 is installed sealing ring 17 and the locking element of the inlet valve, made in the form of an annular sealing element 18. Via the control piston 11 is missing a spring-loaded manual unloading piston 19 with shaped lower part, on which acts a spring 20 through the slotted l-shaped washer 21 and pressed the stop element 22 of the discharge valve to the end cover 23. The piston 19 has a sealing ring 24 and 25. The cover 23 is sealed by a ring 26. Witness the piston 5 has a saddle 27. On the cover 7 is installed o-rings 28 and 29. On the set screw o-ring 30. In cap the pistons, channel 33, indicating the output cavity 4 cavity 34 of the witness and of the control piston, the channel 35, is made in the stepped piston 19, the discharge channel 36 with a variable cross-section along the axis.

In the initial position of the servo piston 5 and the control piston 11 is located in the lower position. When this o-ring shut-off element 18 is pressed against the inner wall of the housing 1, divides the cavity 34 of the witness and of the control piston with the atmosphere, and the chamber 32 of the control piston and the stepped piston 19 through the hole in the control piston, the cavity under the casing 7 through the channels 35 and 36 reports with the atmosphere. A stepped piston 19 with the locking element 22 is pressed against the end cover 23, divides the input cavity 3 and the discharge channel 36.

Operates the pressure regulator as follows.

Compressed air from the compressor is fed into the input cavity 3 and opening the check valve 2, is fed to the output 4 and simultaneously through the channel 33 into the cavity 34 of the witness and the control pistons.

When the growth pressure servo piston 5 moves, and the control piston 11 and a stepped piston 19 is stationary. When the pressure is close to the value of the redistribution operation, there is a sealing om servo piston, the camera 32 disjoined with the atmosphere.

When the air pressure reaches the upper limit of operation, the servo piston 5 begins to co-move with the control piston 11. O-ring seal 18 opens the chamber 32 of the control piston and the stepped piston 19, the compressed air acts on the stepped piston 19, which is moved to another split of the G-shaped washer 21 in the inner wall of the housing 1, and the servo piston 5 and the control piston 11 stop moving. It reports the input cavity 3 with the discharge channel 36. Unloaded compressor. The air flow from the input cavity together with the condensate flows into the shaped channel 36. The profile of the channel and the lower part of the stepped piston 19 is made so that there is an acceleration of the flow stream and in the center of the vacuum is formed (the effect of injection), which facilitates the suction of air from the spring cavity through the channel 35, and in this cavity creates a lower pressure. This stabilizes the discharge process. When the pressure of air in the system to a value corresponding to the lower limit of operation, the controller operates in reverse order. The compressor starts to operate in a mode in which Noah environment. Upon reaching the pressure of the compressed air in the system, the upper limit value controller action cycle repeats.

When the system pressure reaches the upper limit of the operation, and the discharge controller not included (this is only possible when the servo piston 5 is in the down position), the control piston 11 under the influence of high pressure air moves, the o-ring seal 18 opens the camera 32 and the pressure of the air from the system resets to the atmosphere through the hole in the control piston and the channels 35 in the piston 19 and 36 in the lid. At the same time, the air pressure acts on the big stage of the piston 19, which is moved, and the locking element 22 is communicated to the input cavity 3 with the discharge channel is unloaded compressor. The channel 36 is accelerated flow of the jet and the effect of the injection.

When the pressure of air in the system to a value corresponding to the lower limit of the relief mode, the controller operates in reverse order. The compressor starts to operate in a pumping system with compressed air, and petal 31 seals the channel 36.

The PRESSURE REGULATOR contains Copan and the discharge channel, hosts the unloading valve, and installed in the housing by a spring-loaded manual unloading piston and spring servo piston cavity which is in communication with the output cavity and connected in series through normally closed inlet and a normally open outlet valve with cavity over a spring-loaded servo piston and the locking element of the discharge valve installed at the bottom part of the tread of a smaller diameter spring-loaded manual unloading of the piston, characterized in that, in order to reduce size and weight and increase the reliability of the regulator, spring-loaded manual unloading piston and spring servo piston mounted coaxially and in between the installed spring-loaded stepped control piston, which forms with degree smaller diameter spring-loaded manual unloading piston intermediate chamber, and a normally closed inlet valve and a normally open exhaust valve are connected through the intermediate chamber and connected in series with her canal, completed in spring loaded stepped control piston and the locking elements normally closed vpfo diameter and the upper part of the tread of the larger diameter of the piston, when this channel discharge is convex to its axis and cuause-expanding flow profile, spring-loaded stupidity unloading piston has a through axial channel, and the lower part of his stage of smaller diameter has a concave profile and formed with a tapering part of the channel discharge ring injects channel, and at the exit of the discharge channel has a breather.

 

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