CS231935B1 - Distributor with controlled load independent flow - Google Patents

Description

(54) Load-independent flow-controlled switchgear

BACKGROUND OF THE INVENTION The present invention relates to a load-independent controlled flow switchboard. According to the invention, there is provided in the valve body a slide valve in which at least one outflow control valve is directly arranged. By combining the control channel with the supply, consumption or waste channel of the switchgear, a combination of the required functions is achieved. For example, flow control to one or both inlet throats of the appliance, control from one or both outlet throats of the appliance and / or control to one throat of the appliance and control of the flow back from the same throat can be achieved.

GIANT. 1

The invention relates to a load-independent controlled flow switchboard.

Known designs of load-independent controlled flow control valves are provided with a valve which controls the flow of liquid only to the appliance. A separate valve must be used to control the flow of liquid from consumers, not for example when lowering loads or braking.

The above-mentioned disadvantages are eliminated by the switchgear according to the invention, which consists in that it consists of a body in which a slide with two cavities, possibly formed outside its longitudinal axis, is received. In the case of the cavities outside the longitudinal axis of the slide, at least one longitudinal connection is provided in the thickened slide wall, provided with a stopper at the end and connected to the slide cavity with a radial opening. Vnnjší surface of the slide is provided with two radial inlet openings and two outlet openings with radial relief grooves and the other two pairs of radial bores connected to the longitudinal ROP ^ ^{o; n J'e:} With the slide. The pairs of radial apertures are arranged such that one partially extends into the waste channels and is in close proximity to the consumption channels. When the cavities are located in the axis of the spool, at least one of the cavities is provided with a sleeve with longitudinal connection and a spaced arrangement of radial inlet and outlet openings and all other radial openings as in a spool with cavities formed outside its longitudinal axis. There is also a piston in the slide or in the housing, the spring and the spring of which is inserted between the face and the bottom and the ends of the slide are provided with plugs and stops. In addition, two control ducts are formed in the slide body, from which two return stitches are inserted. In the arrangement of the spool with only one piston and spring, the arrangement of the radial orifices is such that one radial orifice is in close proximity to the consumption channel and the other radial orifice is in close proximity to the supply channel.

An advantage of the switchgear according to the invention is that one or two flow control pegs are arranged directly inside the spool. By suitably connecting the control channel with the supply, consumption or waste channel of the switchgear, the desired functions are combined. For example, flow control to one or both of the inlet orifices of the appliance, control from one or both of the outlet orifices of the appliance and / or flow control to one of the appliance's throats and flow control from the same orifice can be achieved.

The accompanying drawings show schematically an exemplary embodiment of a switchgear according to the invention and its wiring. Giant. Fig. 1 is an axial cross-sectional view of the switchgear and its connection to the appliance; Fig. 2 is a detailed illustration of the radial aperture arrangement in the spool with off-axis cavity configuration; Fig. 3 is a detailed radial aperture arrangement for flow control; Fig. 5 is a detailed arrangement of radial orifices for controlling flow to and from one throat of the appliance; Fig. 6 is a detailed arrangement of the cavity off the slide axis.

The distributor (Fig. 1) consists of a body 1, a feed channel opatřerým '- consumer channels 2, 7' to consumer neck 6 holes - 91, - - connecting secondary valves of ^{dp to} properly aniál ^y © ^81. Parallel boar - ^- ^ ii zpilým village ²⁸ with ^the anal ojovacími ^{p y 4,} 41, control channel 13, 13 'and openings -20. 20 '. 20 for connecting screws. A slide 2 with cavities 29, 29 'is slidably mounted in the body J. In the cavities 22, 29 ' are housed sleeves 11, 11, (FIG. 3), closed at the ends by plugs 21, 21 ' with stops -42 " 42 " Cases -13. 13 'are provided on their circumference with a longitudinal connection 40 which is connected to the cavity 29, 29' by a radial bore 31. 31 The slide 4 has circumferentially located radial bores. 16 '. - 17. 17 '. which are connected to the longitudinal connection 30, 30 'of the housing -13. The arrangement - is selected such that the radial openings -16, 161 partially extend into the outflow channels 8, 8 'and the radial openings 17, 17' are in close proximity to the supply channel.

In cases -13. 13 '(in the cavities -29,29') the piston 15 is slidably mounted. 15. on which one end of the spring 1414 'is supported and the other end of the spring 1414' is supported on the bottom of the slide 2. The slide -2 is further provided with radial inlet openings 10, 10 'and radial outlet openings 11. 11 'with relief groove -12. Two valves 22, 22 'are still disposed in the housing 1 of the distributor. which are formed by balls 12, 19. bodies 43, 43 'with holes 45, 45' and transverse holes 46, ⁴⁶ . provided with a seal 44, ⁴⁴ '. connected by a duct ³⁶ with a double return line 23 and with ducts 35 and 37 with a waste 24. optionally with double check valves of another distributor. The double return valve 23 is connected via a line 38 to a pressure balance 25 connected by a branch 41 to a line 39 leading from the pump 26 to the channel 1 of the distributor. A consumer 27 is then connected to the consumption spout 6, 6 'of the distributor 27 by means of a conduit 40, 40'. Another modification of the spool 2 'is shown in Figs. 2 and 6. The spool 2 has cavities 29, 29' formed off its longitudinal axis and longitudinal connections 30, 30 'closed by plugs 33, 33' are connected to the cavities 29, 29 'by radial openings 31, 31'. outwardly closed z ^and t ^{3 to} 32 amino 2 '. Plunger arrangement 15, 15 '. springs 14. 14 '. plug 21 »21 / with stops £ 2. 42 'and radial holes 12, 16'. 17.. 17 'is the same as that of FIG. 1, 3 and optionally as in the alternative arrangement of FIGS. 4, 5.

A further embodiment of the slide 2 (Fig. ‘4) has symmetrically located radial holes 16. 16 '.

17, 17 'connected to the longitudinal links JO, 30' so that the radial bores 16, 16 'extend into the ^p adních ^the annals ^g, Q' and radial float of ^{t =} 12 ^»17 'are placed in a n ^{g e} USRA bTlzkosX ! excise channels 2, 7DIší alternative slider 2 (FIG. 5) that is arranged ^on that show ^Fr t ^k 2 ^p is the ^p nly one commonly applicable measures ^pi stkeí ¹ 5 'of ^the spring ^14. In this US ^p OR, ^{and p} Diana and radial holes 16 '. 17 'connected to the longitudinal connection 30' are positioned such that the radial opening 1 ', 1' is tight. the radial opening 17 'is in close proximity to the supply channel. J.

'. The pump 26 supplies liquid via line 39 to a parallel duct J (FIG. 1). From the conduit 39, the branch 41 to the pressure balance 25 is connected with the waste 24. If the valve 2 of the distributor is in the middle position (as shown in FIGS. 1 and 3), the control channels are Ig. 18 'are connected by radial outlet openings 11, 11' in the slide 2 8 with relief grooves 12, 12 'to the waste channels 8, 8'. The consumer channels 2 are closed, the appliance 27 is blocked. The line 36, 36 and thereby the line. The pressure balance 25 is unloaded and the liquid from the pump flows through it to the waste 24. After partial adjustment of the slide 2, for example, the flood, the connection of the radial outlet openings is closed. H 'and ^L ^ Ana EVE with the slide 2 with the exhaust duct 8' and the interconnect. outlet ports 11 ' with the consumption channel 7 ' The pressure is in the consumption channel 7 ' with the control channel 18 '. via a double return valve 22 ', via a guide 34 via a double return valve 23 via a guide 18 to a pressure-weight piston -29. The pressure balance 25 causes the liquid to drain 24 and in the line 39 in the parallel duct Jav of the inlet duct J the pressure rises to a value a mile higher than the pressure in the consumption duct 7 '. When the slide 2 is moved, the radial opening 17 'of FIG. 3 is also connected to the inlet channel J and closes the radiator, 1.6'. ,

The pressure from the feed channel J is guided through a radial opening 17 'through a longitudinal connection 30' in the housing. 13 'and radial bore. 31 'at the face of the piston 15'. Upon further displacement of the slider 2 to the right of radial inlet propooí ^T vor ^{Y 10} 's feed Tenali J.' ^No not at KapaMna 'Prou ^d IT Riva ^{P d} from the anus ^to the ^H J radial vstáními the apertures * 0' into the cavity 29 The housing ¹³ 'and the radial outlet openings 11' to the consumption channel 7 'of the consumption throat 6' and the conduit 40 'to the appliance 27. Per piston. acting on one 'side' of the pressure in the inlet channel j, on the other 'side of the same pressure, reduced by the loss caused by passage of the feed channel into the J Radial inlets ^U' _ H) with ^p RUŽÍN ^clay and 14 '. Piston ^{to 1} 5 'uncovers radial outpu ^ i oWory 11' enough to maintain the balance íízí inlet pressure in the inlet passage J, an inlet pressure in the inlet duct J snížerým the pressure loss caused by flow from the supply channel J to the slide 2 '8 by a spring force 14 '. Thus, it actually maintains a constant pressure drop across the inlet duct J and the interior of the slide 2 ^and thus regulates the flow to the consumer 27 according to the opening of the radial inlets 10 'and the inlet duct J.

The outlet of the consumer 27 is guided via a line 40 to the consumption throat g, the consumption channel through radial inlet openings 60. into the cavity 22 of the slide 28 through radial outlet openings 11 into the waste channel 8. The radial opening 44 (FIG. 3) is connected to the waste channel 8 and the radial opening 17 is closed, thereby connecting the piston space 15 with the waste 24 and waste. thus, it is not controlled by the piston 18. When the slide g is moved to the left, the operation of the switchgear is similar and the appliance 27 moves upside down. The gate valve g according to FIG. 4 operates in such a way that after adjusting the gate valve g to the right, the radial bore 16 'is connected to the drain channel 8' and the radial bore 17 is connected to the consumption channel 2. 27. ^and 0® between the consumption channel 2 ^{and the} cavity 29 of the slide 2 thereby controlling the flow of liquid from the consumer 27 to the waste 21. The piston 15 'does not participate in the control. After switching to the left, the switchgear operates in reverse. The distributor with slide g of FIG. 5 operates in such a way that the flow to the appliance 27 is controlled when the slide 2 is moved to the right and the flow from the appliance 27 is controlled when the slide 2 is moved to the left. The piston 15 on the right-hand side is not or is disabled.

The switchgear is applicable to all types of hydraulic fluid distribution where flow control and hence speed of the appliance must be controlled independently of the load and where several movements must be controlled at the same time, especially where flow control from the appliance is necessary (eg cranes, forklifts) , loaders, etc.) · Combination of the switchgear with the control pump eliminates the pressure balance, which results in significant energy savings.

Claims (2)

SUBJECT OF THE INVENTION 1. Load-independent flow-controlled switchgear, equipped with one supply channel, two consumption channels with consumption necks to which the appliance is connected, further openings for connecting secondary valves, two waste channels, one parallel channel with non-return valve, two control channels , a gate and holes for connecting screws, characterized in that it is formed by a body (1) in which the gate (2) with cavities (29, 29 ') is formed, possibly outside its longitudinal axis and in which the reinforced wall is formed at least one longitudinal connection (30, 30 ') provided with a stopper (33, 33') at the end, connected by 8 cavities (29, 29 ') through a radial bore (31, 31 * 0) and the outer surface of the slide (.2) is provided with radial inlet openings (10, 10 *) and radial outlet openings (11, 11 ') 8 through a relief groove (12, 12') and further through radial openings 416, 16 ', 17, 17 *) connected to the longitudinal p connection (30, 30 ') such that the radial openings (16, 16') partially extend into the waste channel (8, θ ') and the radial openings (17, 17') are in close proximity to the supply channel (5) or in close proximity to the consumption channels (7, 7 ') and when the cavities (29, 29 *) are positioned in the axis of the slide (2), at least one of the cavities (29, 29 *) is provided with a bushing (13, 13 *) , 30 ') 17, 17', 31, the sleeves (13, 13 *) (14, 14 *) and the ends thereof, there are non-return valves (22, 22 *) formed in the body (1). with the same arrangement of all radial bores (10, 1.0 *, 11, 11 ', 16, 16', as with the slide (2), with the piston (15, 15 *) being slidably mounted between the slide (2, 15 *) between whose front and bottom is inserted with the spring of the gate (2) 31 ') are provided with stoppers (21, 21') with a stop (42, 42 ') and co-control channels (18, 18'), behind which are inserted two double Switchboard according to claim 1, characterized in that the slide (2) is provided with one piston (15) and a spring (14) with radial openings (16 ', 17 *) such that the radial opening (16') is in close proximity the radial opening (17 ') is in close proximity to the supply channel (5).