Control unit for hydraulic systems

FIELD: fluid-pressure actuators.

SUBSTANCE: control unit has pressure and drain spaces made of the ring bores that embraces the housing. The through cylindrical openings of the housing receive slide valves with rods. The cylindrical openings for slide valves and ring bores intersect to define through radial cylindrical openings. The openings has cylindrical cross-pieces whose height allows the slide valve to overlap the pressure space in the neutral position. The working passage is in communication with the drain passage.

EFFECT: simplified structure.

2 cl, 4 dwg

 

The invention relates to the field of engineering, namely to the control units hydraulic systems with servo-mechanisms.

A control unit known hydraulic systems company Mannesmann Rexroth (RE 64555/10 .94, publication date 03.94,), comprising a housing with pressure, work and drain channels, drain and pressure cavities communicating with the drain and outlet channels, respectively, spring-loaded cylindrical spools, accommodated in the housing in a cylindrical bores and in communication with the working channel.

Closest to the present invention is a control unit of the hydraulic systems containing molded case with custom inside the exact method of casting hollow structural elements: pressure, working and drain channels, the annular cavity drain and pressure, communicating with the drain and outlet channels, respectively, through cylindrical holes to accommodate them. The annular cavity is made in the upper part of the cavity of the low - pressure discharge cavity in the lower part of the cavity of the high pressure discharge cavity. The case contains a pressure transmitters, which may be several, which in the case by the number of pressure transmitters is a through cylindrical hole, which guides while moving it. Pressure transducers contain cylindrically the spool with the spring loaded rod. The stem of the valve is moved in the cavity, coaxial with a through cylindrical bore. The spool is made blind axial hole with a blind hand crosses through the radial hole. In the neutral position the valve closes the cavity of the high pressure and informs the working channel (channel a regulated supply of the working environment) with the drain channel. When the spring compression rod under the action of the valve plunger is lowered, overlaps the drain cavity, and its transverse openings aligned with the cavity of the high pressure working fluid flows into the working channel. When the force is removed from the spring, the spool moves to the upper position in which the transverse holes communicated with the drain cavity. Part of the liquid from the working channel merges, which leads to lowering the pressure in the working channel.

The control unit contains a control handle mounted with the opportunity to interact with the pusher, which communicates with the stem of the valve (patent US 418512, epubl year).

A disadvantage of the known control units is in the complexity, and hence, is-low-tech manufacturing. This is explained in the following. Since the housing and the hollow structural elements of the case: drain cavity, cylindrical holes for spools and rods, drain channels nutricous, made by the casting method, the boundaries of internal cavities are fuzzy smoothed form. However, in order to accurately perform the condition under which in the neutral position the valve closes the cavity of the high pressure and informs the working channel (channel a regulated supply of the working environment) with the drain channel, you must provide the exact distance between the pressure and drain cavities when they cross through cylindrical holes to accommodate spools. With this purpose, after casting products in each cylindrical hole for placement of the valve form a bridge between the annular cavities, which is fixed with its lower boundary, namely in the upper plane of intersection of the pressure cavity of the cylindrical hole of the valve rastaivaya belt, thereby defining the boundary jumpers between the pressure and drain cavities. To ensure the operability of the valve jumper must be equal to or slightly greater than the diameter of the radial holes in the spool. The process of executing jumper by boring belts each cylindrical hole for mounting spools is time-consuming. In this case, since the internal functional body cavity of the visually inaccessible, it complicates the control of results of operations.

In addition, since vnutrishnioregionalna of the body cavity is performed by casting and visually inaccessible, this complicates control over their future configuration and location within the body, and the achievable precision casting depends not only on the exact observance of all stages of the technological process of casting, but also on subjective factors, in particular from the experience of the performers. Error casting almost no disposable. All this complicates the design, reduces manufacturability.

In addition, cast construction does not allow to use the existing building, if necessary, increase the number of working channels (increasing the number of through cylindrical holes to accommodate spools), as in this case, a new form for casting housing with all functional cavities. This reduces the manufacturability, it is not possible to unify the design.

Thus, identified as a result of a patent search control blocks, hydraulic systems, analogue and prototype proposed, the implementation does not ensure the achievement of the technical result consists in simplifying the design and improving technology, the possibility of unification.

The present invention solves the problem of creating the control unit of the hydraulic systems, which allows to achieve the technical result consists in simplifying the structure and improving technology, it is lichnosti, the possibility of unification.

The invention consists in that the control unit hydraulic systems, comprising a housing with pressure, work and drain channels, annular cavity drain and pressure, communicating with the drain and outlet channels, respectively, in the casing by the number of working channels through cylindrical apertures aligned with the working channel and communicating with them, each of which is movable cylindrical valve rod, the working cavity of the rod communicated with the drain cavity when the spool is arranged to message working channel with a discharge or drain cavities, the device comprises a body, mounted with the ability to communicate with the stem of the valve, the housing is supplied by a holder with the sealing elements, which covers the building perimeter, and an annular cavity drain and pressure is made in the form of circular bores in the holder or housing, or both constructive nodes, covering the body from the outside perimeter, in addition, the body is made through a radial cylindrical holes that respectively intersect the through cylindrical holes to accommodate spools and the annular bore drain and pressure cavities, with education in end-to-end cylindrical hole is x to accommodate spools cylindrical jumper with height, when in the neutral position the valve closes the pressure cavity and the working channel communicated with the drain channel. In addition, the pressure and drain the cavity is constantly communicated respectively with the pressure and drain channels through is made in the case corresponding radial and transverse blind cylindrical hole, the open end of which is communicated respectively with the pressure and drain channels. This disc contains two supporting cylindrical neck, the United cylindrical crosspiece, which is a through the radial hole and crossing his blind axial hole, the open end of which is in communication with the working channel.

The technical result consists in the following. The presence in the control unit of the hydraulic systems of the body with pressure, work and drain channels, cavities pressure and drain connected to the pressure and drain channels respectively made through the body parallel to its axis corresponding to the blind holes and crossing their radial holes, with the open end blind holes communicated respectively with the pressure and drain channels, collectively form the basis gidroraspredeliteli device.

Implementation in the form of circular bores of the annular cavities drain and pressure within a housing or enclosure, or in both con is reconstructive nodes, covers the body from the outside perimeter, as well as performing in the housing through a radial cylindrical holes which respectively intersect the through cylindrical holes to accommodate spools and the annular bore drain and pressure cavities, provides access to the pressure and drain cavities and messages with them all working channels through the valve and a cavity for placement of the rods.

The ability to convert pressure in the working channels when moving the slide valve is provided by the execution in case the number of operating channels a through cylindrical hole coaxial with the working channels and communicating with them, each of which is movable cylindrical valve rod, the working cavity of the rod communicated with the drain cavity, and the valve is arranged to message working channel with a discharge or drain cavities, for which the body is made through a radial cylindrical holes that intersect the cylindrical holes for spools and the annular bore pressure and drain cavities, respectively. This disc contains two supporting cylindrical neck, the United cylindrical crosspiece, which is a through the radial hole and crossing his blind axial hole, the open end of which reported the Yong with a working channel. The result is the ability of the regulated messages working channels with the annular pressure and drain cavities through the spool and the working cavity of the rod, allows a regulated supply of working medium in the working channel.

Run the case through the radial cylindrical bores intersecting cylindrical holes for spools, provides the ability to perform basic work of cavities in the form of a shallow circular bores. In turn, this enables the annular cavities drain and pressure or in a housing or in the housing, or both constructive nodes. This simplifies the manufacture of the device as a whole, and therefore, improves the manufacturability of the design.

Introduction to the control unit casing with sealing elements, which covers the body from the outside perimeter, as well as the implementation of annular cavities drain and pressure or in a housing or in the housing, or both constructive nodes in the form of circular bores, covering the body from the outside perimeter, provides the ability to create in the case of closed ring volume ring pressure ring and drain cavities.

This simplifies the implementation and at the same time increases the accuracy of the placement of one of the main elements of the design, ensuring the th performance spools, accommodated in the housing in end-to-end cylindrical bores, namely simplified execution in building bridges between the drain and the pressure cavities. The proposed technical solution, this is because the drain and the pressure cavity is made in the housing or in the housing, or both constructive nodes, covering the body from the outside perimeter, in the form of circular bores and holes to accommodate spools with the rod is cylindrical. This annular cavity and a cylindrical hole communicated between them is made in the case of crossing them through radial cylindrical holes, and the result of this intersection is the formation of cylindrical jumpers in the through cylindrical holes to accommodate spools.

In addition, the proposed solution allows to take into account the structural features of the valve. This is because the annular cavity and the cylindrical hole communicated between them is made in the case of crossing them through radial cylindrical holes, and the result of this intersection is the formation of cylindrical jumpers in the through cylindrical holes to accommodate spools with height, which in the neutral position the valve closes the pressure cavity and the working channel message is n with the drain channel. While this condition is ensured by the distance between made in the body through radial cylindrical holes which respectively intersect the through cylindrical holes to accommodate spools and the annular bore drain and pressure cavities. Because of the radial cylindrical holes perform outer drilling provides visibility when running jumper despite the fact that it is formed within the cylindrical hole of the spool. This simplifies the design and manufacturing of control unit and improves the manufacturability of its manufacture. The possibility of varying the height of the jumper (the distance between the drain and pressure cavities) depending on the design of the valve allows you to use the same case, which gives the claimed device property unification. Perform pressure and drain cavities in the form of circular bores, as well as the implementation of the holes to accommodate cylindrical spools and message them with pressure and drain cavities by drilling in the case of radial holes with the formation of the jumper also provides the possibility of using the same chassis if necessary, increase the number of operating channels, allowing unify the tion of the device.

Execution of annular cavities drain and pressure or in a housing or in the housing, or both constructive nodes in the form of circular bores, covering the body from the outside perimeter, simplifies the design, as the main working cavities perform outward turning or drilling, oral visually available when running and their sizes are controlled.

While running inside the auxiliary functional cavities, provides the devices, in the form of a cylindrical deaf axial bore, a radial overlapping cylindrical holes simplifies the design of the control unit and its manufacture. This improves the manufacturability of the device, since the auxiliary functional cavity can be performed by the drilling operation drilling visually accessible for inspection.

Thus, due to the fact that in the proposed design of the control unit all internal functional cavity is structurally simple, namely cylindrical and radial holes, the annular bore, and, in addition, visually accessible at their implementation and monitoring. It is constructive simplifies the control unit causes the simplicity of its implementation. In addition, the proposed functional form cavities allows you to use to issue the log of simple and affordable ways: turning machining and drilling, which simplifies its manufacture and improves the manufacturability of the device.

From the above it follows that the proposed control unit of the hydraulic systems in the implementation ensures the achievement of the technical result consists in the simplification of the structure, improving technology, the possibility of unification of the control unit.

Figure 1 shows the control unit of hydraulic systems: section passing through the axis of the cylindrical holes that have spools; figure 2 is an axial section of the control unit of the hydraulic systems, illustrating the connection diagram of the pressure and drain cavities respectively to the pressure and drain channels; figure 3 is an axial section of the control unit of the hydraulic systems, illustrating the connection diagram of the pressure and drain cavities respectively to the pressure and drain channels: section a-A; figure 4 is an axial section of the control unit of the hydraulic systems, illustrating the connection diagram of the pressure and drain cavities respectively to the pressure and drain channels, cut for In-C.

The control unit of the hydraulic system includes a housing 1, soltice 2 with the rods 3. The body 1 is installed ferrule 4 with the sealing elements 5. The case is made by the number of working channels through cylindrical holes 6, each of which movably RA is substituted cylindrical valve 2 spring-loaded rod 3. The body is made through a radial cylindrical holes 7 and 8 that intersect the cylindrical holes 6 for 2 spools. The opening 6 is located between the cavity of the stem 9 in the housing 1 and is made in the lid 10 of the housing 1 working channel 11 for a regulated supply of fluid under pressure to the consumer, particularly to the Executive hydraulic valve system equipped with cylinders.

In the example, the execution control unit spools 2, placed in the hole 6, contain two supporting cylindrical neck 12 and 13, the United cylindrical crosspiece 14. The spool 2 is made through a radial hole 15 and crossing his blind axial hole 16 made in the spool 2, the open end of which is in communication with the working channel 11.

The yoke 4 with the sealing elements 5 tightly encloses the housing 1 along the perimeter. In the housing 1 is made in the form of circular bores of the annular cavity: pressure 17 and drain 18 covering the housing 1 from the outside perimeter (can be done in the holder 4, or in the case 1, or both constructive nodes). Pressure cavity 17 is constantly communicated with the discharge channel 19 (source pressure) through made in the case 1 radial 20 and crossing it perpendicularly deaf axial cylindrical hole 21.

Ring somnabulist 18 is constantly communicated with the drain channel 22 through is made in the housing 1 corresponding radial 23 and crossing it perpendicularly blind cylindrical hole 24. The open ends of the blind holes 21 and 24 are communicated respectively with the pressure and drain channels.

The working cavity of the rod communicated with the drain channel 22 through the annular cavity 18 and the openings 23, 24 and channel 25, is made in the cover 10.

End-to-end radial cylindrical holes 7 and 8 intersect the cylindrical holes 6 for the spools 2 and the cavity 17, 18 formed as a cylindrical hole 6 jumpers 26 height at which in the neutral position the valve 2 closes the pressure cavity 17, and the working channel 11 is communicated with the drain channel 22. End-to-end radial cylindrical holes 7 and 8 are communicated respectively with the pressure head 17 and the drain 18 cavities, respectively, through the openings 20 and 23.

The device comprises a body, mounted with the possibility of interacting with the stem 3 of the valve 2. In the example, the execution control unit is accomplished similarly to that described in the patent of the Russian Federation No. 2187719, F 15 13/042, epubl, the governing Body holds the slider 27 and washer 28 covering a gap rod 3 between the head 29 and the bearing neck 30 of the spool 2. In the slide made the cavity 31 within which is located the head 29 of the rod 3, having limited axial movement relative to the slide 27. The stem 3 of the valve 2 is spring-loaded relative to the slide bar 27 by a spring 32. The slider 27 podrug is replaced relative to the housing 1 return spring 33, based on the end 34 of the cavity 9.

The device operates as follows. The control unit is designed to create a secondary pressure, operate the spools of the directional control valve. In the neutral position of the spool 2, the height of the lintel 26 provides conditions under which the valve 2 closes the pressure cavity 17, and the working channel 11 (channel a regulated supply of liquid) communicated with the drain channel 22 through the axial hole 6, the openings in the slide valve 16, 15, hole 8, the annular cavity 18, the holes 23, 24, 25.

In the proposed example of executing the height of the lintel 26 perform equal to the jumper 14 made in spool or in excess of not more than 0.3 mm

For supplying fluid under pressure to the user move the slider 27 in the direction of the end face 34 of the cavity 9 of the rod 3. Together with the slide moves down under the action of the spring spool 2, which is falling, covering the gap between the neck 12 of the spool 2 and the radial hole 8 in the body 1 and opens the passage for fluid under pressure from the annular cavity 17 through a radial hole 20, through the annular cavity adjacent to the crosspiece 14 of the valve 2, the holes in the spool 2 radial 15, 16 in the axial channel 11. Increased fluid pressure in the channel 11, which, acting on the end face of the spool 2, facing the channel 11, displaces gold is IR 2 up, compressing the spring 32. Lifting the spool 2 divides the annular cavity 17 (pressure cavity and a radial hole 8 in the valve 2, closing, however, the passage of fluid from the annular cavity 17 to the channel 11. If you want to increase the fluid pressure in the channel 11, the slider 27 is moved further down, further compressing the spring 31. Under the action of the spring the valve 2 again moves down, opening a passage for fluid under pressure from the annular cavity 17 through the opening 8 in the valve through a radial hole 15 and 16 in the axial channel 12. The pressure in the channel 11 will increase, resulting in increased axial force on the spool 2 from channel 11. When it reaches a certain value, which depends on the force of the compression spring 32, the valve 2, shifting up again overlaps the neck 13 of the discharge opening 8 in the housing 1.

If you want to reduce the fluid pressure in the channel 11, it is necessary to allow the slider 27 to move upward under the action of its return spring 33. In this case decreases the force acting on the spool 2 by the spring 32, and the valve under the action of fluid pressure in the channel 11 is shifted upward, opening the entrance slit for fluid from the pipe 11 through the holes 6, 16, 7 in the annular cavity 17. Drain the excess liquid from the channel 11 and the pressure therein decreases until, until you are equalized axial Silina the spool 2, acting on it by the spring 32 and the fluid pressure on the end face of the spool from the side channel 11, after which the valve 2 again overlaps mentioned the entrance slit.

If you need to remove the pressure in the channel 11, then let go of the slider 27, which under the action of the spring 33 returns to its original position. In return, the slider pulls the rod 3 for the cylinder 28 and sets the spool 2 in the upper position, while the maximum gate opens the seam between the neck of the spool 12 and the radial opening 8 in the housing 1. There is a rapid discharge of excess liquid from the pipe 11 through the openings 16, 15, 8, annular cavity 18, the holes 22, 24, 25 into the drain cavity 22. This provides a quick timely stop actuators connected to the control unit, and returning them to the original position.

1. The control unit hydraulic systems, comprising a housing with pressure, work and drain channels, annular cavity drain and pressure, communicating with the drain and outlet channels, respectively, in the casing by the number of working channels through cylindrical apertures aligned with the working channel and communicating with them, each of which is movable cylindrical valve rod, the working cavity of the rod communicated with the drain cavity when the spool is made with the messages of the working channel with the discharge or drain cavities, the device contains the governing body mounted with the possibility of interacting with the stem of the valve, characterized in that the housing is equipped with a holder with the sealing elements, which covers the building perimeter, and an annular cavity drain and pressure is made in the form of circular bores in the holder, or housing, or both constructive nodes, covering the body from the outside perimeter, in addition, the body is made through a radial cylindrical holes that respectively intersect the through cylindrical holes to accommodate spools and the annular bore drain and pressure cavities, with education through cylindrical holes to accommodate spools cylindrical jumper with height, which in the neutral position the valve closes the pressure cavity and the working channel communicated with the drain channel.

2. The control unit according to claim 1, characterized in that the pressure and drain the cavity is constantly communicated respectively with the pressure and drain channels through is made in the case corresponding radial and transverse blind cylindrical hole, the open end of which is communicated respectively with the pressure and drain channels.

3. The control unit according to claim 1, characterized in that the valve contains two reference tsilindricheskaya, United cylindrical crosspiece, which is a through the radial hole and crossing his blind axial hole, the open end of which is in communication with the working channel.



 

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