CN201027637Y - Flow Sensitive Control Valve System for Load Sensing Hydraulic Pumps - Google Patents

Abstract

The utility model discloses a flow rate sensitive control valve system for load sensitive hydraulic pump, comprising a flow rate sensitive signal acquisition sensing main valve system, a flow rate sensitive signal acquisition sensing pilot valve system and a flow rate sensitive signal sensing control system. Based on the detection feedback function inside a pilot type control valve and the overall liquid resistance network configuration inside a valve bank, etc., the utility model ensures that the characteristics of a load sensitive variable displacement pump meet the requirements of engineering system better; moreover, the utility model can increase the steady state control precision and the dynamic response speed in controlling a load sensitive pump; meanwhile, the utility model can improve the flow rate adaptability of the control system through designing a series of parameters of a valve port. With the closed loop detection feedback inside the controller of the utility model and the appropriate liquid resistance network configuration inside a detection and control system which are combined with the inserting technology, the utility model can increase control performance and system stability, thereby obtaining excellent performance, a compact structure, ideal versatility and wide adaptation range of flow rate.

Description

Flow Sensitive Control Valve System for Load Sensing Hydraulic Pumps

technical field

The utility model relates to an electro-hydraulic control variable pump system characterized by load sensitive control of a hydraulic control system, in particular to a flow sensitive control valve system for a load sensitive hydraulic pump.

Background technique

Energy saving has always been one of the focuses of hydraulic technology research, and load-sensitive variable pumps can provide the most effective energy-saving effect for hydraulic systems. Among them, the performance of the control device is the most concerned, which is not only related to the energy-saving effect, but also related to the stability, steady-state accuracy and dynamic response speed of the pump source system. General control devices mostly use traditional throttling control devices and sensor devices, which often cannot give consideration to stability, precision, and rapidity.

Contents of the invention

The purpose of the utility model is to provide a flow sensitive control valve system for a load sensitive hydraulic pump, which can improve the control stability, steady-state precision and dynamic response quickness.

In order to achieve the above purpose, the technical solution adopted by the utility model is to include: a flow sensitive signal acquisition sensing main valve system, a flow sensitive signal acquisition sensing pilot valve system and a flow sensitive signal sensing control system; wherein:

1) Flow sensitive signal acquisition sensing main valve system: including the main valve body, main valve sleeve, main valve core, main spring, feedback spring; the main valve sleeve is installed between the main valve body and the shoulder of the pilot valve body; the main valve The core is installed in the main valve sleeve and can move in the main valve sleeve. The feedback spring is installed between the pilot valve core and the main valve core to form the feedback detection element of the main valve displacement-force feedback; one end of the main spring is installed in the pilot In the valve body, the other end of the main spring is installed on the main spool;

2) Flow sensitive signal acquisition sensing pilot valve system: including pilot valve body, pilot valve sleeve, pilot valve core, proportional electromagnet, the proportional electromagnet is installed on the pilot valve body, and the pilot valve body is installed on the main valve body close to the main valve one side of the core;

3) Flow sensitive signal sensing control system: including the main valve body, regulating spool, regulating spring and two liquid resistances; the regulating spring is installed between the first plug of the main valve body and the regulating spool; the regulating spool is installed on Between the second plug and the adjusting spring, the valve core can move in the valve hole in the valve body;

The flow from the variable pump enters the inlet of the main valve and is divided into three paths. The first path passes through the first cavity of the main valve port and flows to the outlet to supply to the load; the second path passes through the first flow channel and the first liquid resistance to the pilot valve. body; the third path passes through the second flow path, the third flow path to the fourth flow path; the oil from the first liquid resistance is divided into three paths, the first path passes through the fifth flow path, the pilot valve port to the outlet, and the first flow path 6. The seventh and eighth channels flow to the outlet of the main valve; the second channel enters the inner cavity of the electromagnet through the ninth channel and the tenth channel; the third channel enters the feedback spring and the main valve through the second liquid resistance. The second cavity where the spring is located; the oil from the fourth flow channel flows into the third cavity and is divided into two paths, and the third cavity communicates with the left end of the regulating spool through the fourth liquid resistance; the left step of the regulating spool Either separate the oil in the third chamber from the eleventh channel, at this time the eleventh channel communicates with the fourth chamber, or make it communicate with the eleventh channel, at this time the fourth chamber is separated from the eleventh channel , the eleventh flow passage communicates with the twelve flow passage, and the twelve flow passage leads to the variable control cylinder of the variable pump; the fourth chamber communicates with the oil return port through the thirteenth, fourteenth flow passage and fifteenth flow passage; the main valve The exported oil is led to the seventeenth flow channel through the sixteen flow channel and the third liquid resistance therein, and then to the spring chamber at the right end of the regulating valve core through the seventeen flow channel.

The valve port of the main valve core is rectangular, triangular or inverted trapezoidal.

The beneficial effect of the utility model is: based on the detection and feedback function inside the pilot control valve and the configuration of the hydraulic resistance network inside the whole valve group, the characteristics of the load sensitive variable pump can be more adapted to the requirements of the engineering system. It can improve the steady-state control accuracy and dynamic response speed of load-sensing pump control. At the same time, the flow adaptability of the control system is enhanced by designing a series of parameters of the valve port. The device is characterized by the closed-loop detection feedback inside the controller, and the appropriate liquid resistance network configuration inside the detection and control system, combined with the plug-in technology, which can improve the control performance and system stability. It is an excellent performance, It is an energy-saving control device with compact structure, good versatility, and wide adaptable flow range.

Description of drawings

Fig. 1 is the structural principle schematic diagram of the present utility model;

Fig. 2 is a sectional view of a sensitive signal sensing valve assembly;

Figure 3 is a location map of the sensitive signal sensing valve.

In the figure: 1, main valve body, 2, flow channel, 3, main valve inlet, 4, flow channel, 5, main valve sleeve, 6, main valve port, 7, main valve core, 8, cavity, 9, Feedback spring, 10, main valve spring, 11, liquid resistance, 12, liquid resistance, 13, flow channel, 14, pilot valve port, 15, flow channel, 16, outlet, 17, flow channel, 18, pilot valve sleeve, 19. Proportional electromagnet, 20. Pilot valve body, 21. Pilot spool, 22. Runner, 23. Runner, 24. Runner, 25. Main valve outlet, 26. Cavity, 27. Runner, 50 , flow path, 51, liquid resistance, 52, right spring cavity, 53, flow path, 54, adjustment spring, 55, adjustment valve core, 56, valve cavity, 57, flow path, 58, valve cavity, 59, liquid resistance , 60, runner, 61, runner, 62, runner, 63, runner, 64, plug 65, valve hole, 66, left step, 67, plug, 68, oil return port.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, the utility model includes a flow sensitive signal acquisition sensing main valve system, a flow sensitive signal acquisition sensing pilot valve system and a flow sensitive signal sensing control system; wherein:

1) Flow sensitive signal acquisition sensing main valve system: including main valve body 1, main valve sleeve 5, main valve core 7, main spring 10, feedback spring 9; main valve sleeve 5 is installed on main valve body 1 and pilot valve body 20 between the shoulders; the main valve core 7 is installed in the main valve sleeve 5 and can move in the main valve sleeve 5, and the feedback spring 9 is installed between the pilot valve core 21 and the main valve core 7 to form the displacement of the main valve— Feedback detection element for force feedback; one end of the main spring 10 is installed in the pilot valve body 20, and the other end of the main spring 10 is installed on the main valve core 21;

2) Flow sensitive signal acquisition sensing pilot valve system: including pilot valve body 20, pilot valve sleeve 18, pilot valve core 21, proportional electromagnet 19, proportional electromagnet 19 is installed on pilot valve body 20, pilot valve body 20 is installed On the side of the main valve body 1 close to the main valve core 7;

3) Flow sensitive signal sensing control system: including main valve body 1, regulating valve core 55, regulating spring 54 and two hydraulic resistances 51, 59; regulating spring 54 is installed on the first plug 64 of main valve body 1 and regulating valve between the spools 55; the regulating spool 55 is installed between the second plug 67 and the regulating spring 54, and the spool 55 can move in the valve hole 65 in the valve body 1;

The flow from the variable pump enters the inlet 3 of the main valve and is divided into three paths. The first path passes through the main valve port 6 and the first cavity 8 and flows to the outlet 25 to supply to the load; the second path passes through the first flow path 4 and the first flow path. Liquid resistance 11 to pilot valve body 20; the third path passes through the second flow channel 2, the third flow path 27 to the fourth flow path 60; the oil from the first liquid resistance 11 is divided into three paths, and the first path passes through the second flow path The fifth flow passage 13, the pilot valve port 14 to the outlet 16, the sixth, seventh and eighth flow passages 23, 22, 24, flow to the main valve outlet 25; the second passage passes through the ninth flow passage and the tenth flow passage 15, 17 enters the inner cavity of the electromagnet 19, and the third way, through the second liquid resistance 12, enters the second cavity 26 where the feedback spring 9 and the main valve spring 10 are located; the oil from the fourth flow channel 60 flows into the third cavity After 58, it is divided into two roads, the third chamber 58 communicates with the left end of the regulating valve core 55 through the fourth liquid resistance 59; the left step 66 of the regulating valve core 55 or the oil in the third chamber 58 and the eleven flow passage 57 At this time, the eleventh channel 57 communicates with the fourth cavity 56, or makes it communicate with the eleventh channel 57. At this time, the fourth cavity 56 is separated from the eleventh channel 57, and the eleventh channel 57 is connected to the twelve channel. The flow passages 69 communicate, and the twelve flow passages 69 lead to the variable control cylinder of the variable pump; the fourth chamber 56 communicates with the oil return port 68 through the thirteenth, fourteenth flow passages and fifteenth 63, 62, 61; The oil at the main valve outlet 25 is led to the seventeenth flow passage 53 through the sixteenth flow passage 50 and the third liquid resistance 51 therein, and then to the right end spring chamber 52 of the regulating valve core 55 through the seventeenth flow passage 53 .

The valve port of the main valve core 7 is rectangular, triangular or inverted trapezoidal.

The working principle of the utility model is as follows:

Flow Sensitive Signal Acquisition Sensing Main Valve System (as shown in FIG. 1 ): includes main valve body 1 , main valve sleeve 5 , main valve core 7 , main spring 10 , feedback spring 9 and so on. The main valve sleeve 5 is installed between the main valve body 1 and the shoulder of the pilot valve body 20 inserted in the hole of the main valve body; the main valve core can move in the main valve sleeve, and the feedback spring 9 is installed on the pilot valve core 21 Between the main valve core 7, it is the feedback detection element of the main valve displacement-force feedback. One end of the main spring 10 is installed in the pilot valve body, and the other end is installed on the main valve core 21 .

Under the action of the input force of the proportional electromagnet 19, the device operates: the main valve core 7 moves to the left, the main valve port 6 is opened, the entire flow of the variable pump passes through the main valve port 6, and flows to the outlet 25 to supply to the load, the valve port of the main valve core 6 can be a rectangle, a triangle, an inverted trapezoid, etc. When the oil flows through the main valve port 6, the main spool 7 moves to the left and acts on the pilot spool 21 through the feedback spring 9. Compared with the input force of the electromagnet 19, the working position of the pilot spool 21 is determined.

Flow Sensitive Signal Acquisition Sensing Pilot Valve System (as shown in FIG. 1 ): includes pilot valve body 20 , pilot valve sleeve 18 , pilot valve core 21 , proportional electromagnet 19 and so on. The proportional electromagnet 19 is installed on the pilot valve body 20, and the pilot valve body 20 is installed on the main valve body. After the proportional electromagnet is energized, the electromagnetic force pushes the pilot valve core 21 to move to the right through the push rod 28 protruding from the proportional electromagnet 19, and opens the pilot valve port 14. The pilot flow of the main valve from the inlet 3 passes through the flow channel 4, liquid Resistance 11, enter flow channel 13. The first path enters the inner cavity of the electromagnet 19 through the flow channels 15 and 17 . The second way, through the liquid resistance 12, enters the cavity 26 where the springs 9 and 10 are located. The third way passes through the pilot valve port 14, the outlets 16, 21, the runners 23, 22, 24, and flows to the outlet 25. The input force of the electromagnet 19 is balanced with the active force of the feedback spring 9 caused by the leftward movement of the main spool 7 to determine the working position of the pilot spool 21 .

Flow sensitive signal sensing control system (as shown in Fig. 1, Fig. 2 and Fig. 3): including main valve body 1, spool 55, spring 54, liquid resistance 51, 59, etc. The spring 54 is installed between the plug 64 and the valve core 55 ; the valve core 55 is installed between the plug 67 and the spring 54 , and the valve core 55 can move in the valve hole 65 in the valve body 1 . The oil at the inlet 3 of the main valve passes through the flow passages 2 and 27 inside the valve body to the flow passage 60, enters the valve cavity 58, and leads to the left end of the valve core 55 through the liquid resistance 59. The left step 66 of the spool 55 either separates the oil in the valve cavity 58 from the flow channel 57 (at this time, the flow channel 57 communicates with the valve cavity 56), or makes it communicate with the flow channel 57 (at this time, the valve cavity 56 communicates with the orifice). 57 apart). Runners 57, 69 lead to the variable control cylinder of the variable pump. The valve chamber 56 communicates with the oil return port 68 through flow passages 63 , 62 , 61 . The oil at the outlet 25 of the variable control main valve is led to the flow channel 53 through the internal flow channel 50 and the liquid resistance 51 therein, and then to the spring chamber 52 at the right end of the spool 55 through the flow channel 53 . The hydraulic pressure acting on the right end of the spool 55 plus the force of the spring 54 is balanced with the hydraulic pressure acting on the left end surface of the spool 55 from the channel 60 to determine the working position of the spool 55 .

Claims (2)

1. a load-sensitive oil hydraulic pump flow-sensitive control valve system is characterized in that: comprise that the flow-sensitive signal obtains sensing main valve system, the flow-sensitive signal obtains sensing pilot valve system and flow-sensitive sensing control system; Wherein:

1) the flow-sensitive signal obtains sensing main valve system: comprise main valve body (1), main valve housing (5), main valve plug (7), main spring (10), feedback spring (9); Main valve housing (5) is installed between main valve body (1) and guide's valve body (20) convex shoulder; Main valve plug (7) is contained in the main valve housing (5), and can move in main valve housing (5), and feedback spring (9) is installed between guide's spool (21) and the main valve plug (7), constitutes the feedback Detecting element of main valve displacement one force feedback; One end of main spring (10) is contained in guide's valve body (20), and the other end of main spring (10) is installed on the main valve plug (21);

2) the flow-sensitive signal obtains sensing pilot valve system: comprise guide's valve body (20), guide's valve pocket (18), guide's spool (21), proportion electro-magnet (19), proportion electro-magnet (19) is installed on guide's valve body (20), and guide's valve body (20) is installed in the side of main valve body (1) near main valve plug (7);

3) flow-sensitive sensing control system: comprise main valve body (1), regulating spool (55), Regulation spring (54) and two liquid resistances (51,59); Regulation spring (54) is installed between main valve body (1) first plug (64) and the regulating spool (55); Regulating spool (55) is installed between second plug (67) and the Regulation spring (54), and spool (55) can move in the valve opening (65) in the valve body (1);

Be divided into three the tunnel after the next flow of variable displacement pump enters main valve import (3), the first via is through primary valve (6) first cavity volumes (8), flow direction outlet (25), for past load; The second the tunnel hinders (11) through first flow (4), first liquid arrives guide's valve body (20); Third Road through second runner (2), the 3rd runner (27) to the 4th runner (60); Fluid from first liquid resistance (11) is divided into three the tunnel, and the first via to outlet (16), the 6th, the 7th and the 8th runner (23,22,24), flows to main valve outlet (25) through the 5th runner (13), poppet port (14); The second the tunnel enters the inner chamber of electromagnet (19) through the 9th runner and the tenth runner (15,17), and Third Road enters feedback spring (9), main spool spring (10) place second cavity volume (26) through second liquid resistance (12); Be divided into two the tunnel after flowing to the 3rd cavity volume (58) from the fluid of the 4th runner (60), the 3rd cavity volume (58) communicates with the left end of regulating spool (55) by the 4th liquid resistance (59); The left step (66) of regulating spool (55) or the fluid and 11 runners (57) of the 3rd cavity volume (58) are separated, the 11 runner this moment (57) communicates with the 4th cavity volume (56), it is communicated with 11 runners (57), the 4th cavity volume this moment (56) separates with eleven holes road (57), 11 runners (57) communicate with 12 runners (69), and 12 runners (69) lead to the Variable Control cylinder of variable displacement pump; The 4th cavity volume (56) by the 13, the 14 runner and the 15 (63,62,61) communicates with return opening (68); The fluid of main valve outlet (25) is guided to 17 runners (53) through 16 runners (50) and the resistance of the 3rd liquid wherein (51), through the right-hand member spring chamber (52) of 17 runners (53) to regulating spool (55).

2. a kind of load-sensitive oil hydraulic pump flow-sensitive control valve system according to claim 1 is characterized in that: the valve port of described main valve plug (7) is rectangle, triangle or trapezoidal.

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