Multi-way control valve

Abstract

The multi-way control valve comprises a main valve body, the two sides of the top in the main valve body are provided with an oil channel A and an oil channel B which are used for being connected with an execution piece, the bottom of the main valve body is provided with a port P and a port T which are used for being connected with an oil tank and an oil pump, and the middle of the main valve body is provided with a valve element used for controlling connection and disconnection of the oil channel A, the oil channel B, the port P and the port T; a proportional pressure reducing valve and a flow sensor which are used for controlling the valve element to move left and right are arranged on the outer side face of the main valve body, the flow sensor extends into the oil way A and the oil way B, and the flow sensor is in electric signal connection with the proportional pressure reducing valve. The electric proportional pressure reducing valve controls the pilot oil pressure of the valve element and precisely controls the displacement of the valve element, the sensor detects the flow of an oil duct connecting the main valve body and the execution piece and feeds back the flow to the electric proportional pressure reducing valve, and high-precision regulation and control are achieved.

Description

Technical Field

[0001] The utility model relates to a fluid distribution device, in particular to a multi-way control valve. Background Art

[0002] In the hydraulic system of mobile machinery, in order to improve the efficiency of the hydraulic system, save energy consumption and improve operating performance, ordinary electronically controlled three-position six-way multi-way valves are often used.

[0003] The invention patent application with publication number CN 110857709 A discloses a control device for a three-way valve capable of realizing manual, electric and hydraulic control. The device has multiple control modes, but its control accuracy is low. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide a multi-way control valve that accurately controls the movement of the valve core.

[0005] Technical solution: The utility model includes a main valve body, and the top two sides of the main valve body are provided with oil channels A and oil channels B for connecting to the actuator, the bottom is provided with P port and T port for connecting to the oil tank and oil pump, and the middle is provided with a valve core for controlling the flow between oil channels A, oil channels B, P port and T port; the outer side of the main valve body is provided with a proportional pressure reducing valve and a flow sensor for controlling the left and right movement of the valve core, the flow sensor extends into the oil channels A and oil channels B, and the flow sensor and the proportional pressure reducing valve are electrically connected.

[0006] Preferably, in order to be able to adjust the valve core displacement according to the actuator load, a pressure sensor is provided on the outer side of the main valve body, the pressure sensor extends into the oil channel A and the oil channel B, and the pressure sensor is electrically connected to the proportional pressure reducing valve.

[0007] Preferably, port T is located on both sides of port P, and a pressure compensating valve is provided between oil channel A and oil channel B. The middle part of the valve core end of the pressure compensating valve is connected to port P through the first oil channel, and the two sides are connected in sequence through the bridge oil channel, the second oil channel and oil channel A, and oil channel B, and the second oil channel is connected to port T. The valve core passes through the first oil channel, the bridge oil channel, and the second oil channel to control the flow between port P and the first oil channel, between the bridge oil channel and the second oil channel, and between the second oil channel and port T.

[0008] Preferably, the first oil channel includes an annular oil channel and an offset oil channel. The middle part of the valve core end of the pressure compensation valve is connected in sequence through the first oil channel, the annular oil channel and the P port. The valve core passes through the annular oil channel and the offset oil channel, and a throttling groove is provided in the middle for controlling the flow rate of the annular oil channel and the offset oil channel.

[0009] Preferably, in order to realize the serial connection of multiple main valve bodies, pilot oil passages for guiding pilot oil are respectively provided on both sides of the main valve body, and the pilot oil passages are arranged along the thickness direction of the main valve body.

[0010] Preferably, oil passages A and B are respectively provided with safety valves.

[0011] Preferably, a handle for driving the valve core to move left and right is provided on the outer side of the main valve body, and the proportional pressure reducing valve and the handle are located on opposite sides of the main valve body.

[0012] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. Precise control of valve core movement: The valve core pilot oil pressure is controlled by the proportional pressure reducing valve to precisely control the valve core displacement. The sensor detects the flow rate of the oil channel connecting the main valve body and the actuator, and feeds back to the electric proportional pressure reducing valve. If the information of the two is inconsistent, the current applied to the solenoid valve is adjusted to achieve precise control; 2. Comprehensive and accurate information: The actuator load information and the exact time of controlling the flow cannot be obtained only through the flow sensor. The addition of a pressure sensor makes up for this defect and provides comprehensive information detection; 3. Compatible with electric adjustment and manual adjustment; 4. Multiple main valve bodies can be connected in series. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a top view of the multi-way control valve;

[0014] Figure 2 This is a longitudinal sectional view of the main valve body;

[0015] Figure 3 This is a schematic diagram of the connection relationship of the multi-way control valve. DETAILED DESCRIPTION

[0016] The technical solution of the present utility model will be further described below with reference to the accompanying drawings.

[0017] like Figure 1 and Figure 2 As shown, this is a multi-way control valve disclosed in the present invention. The multi-way control valve is mainly composed of an oil inlet link 2 and a main valve body 7. The oil inlet link 2 and the main valve body 7 are fixed in series by bolts, and a sealing ring is provided at the interface to improve the sealing performance.

[0018] The top of the oil inlet connector 2 has an oil inlet 3, flanked by a pressure reducing valve 1 and an unloading valve. A portion of the oil introduced through the oil inlet 3 is diverted and flows out of the pressure reducing valve 1, serving as pilot oil for the spool 20 of the main valve body 7. The pressure reducing valve 1 is used to reduce the pressure of this pilot oil. The unloading valve connects the oil inlet 3 to the fuel tank. When the spool 20 is not reversing, the plug on the unloading valve seat 4 is opened, allowing the oil in the oil inlet 3 to push the unloading valve spool back into the fuel tank.

[0019] There are oil passages A and B on the left and right sides of the top of the main valve body 7. The outlets of the oil passages A and B are connected to the actuator (not shown). An oil inlet P port and an oil return T port are provided in the middle of the bottom of the main valve body 7. The T ports are located on both sides of the P port.

[0020] A pressure compensating valve is provided between oil passages A and B. The pressure compensating valve includes a compensating valve seat 19, a compensating valve spring 18, and a compensating valve core 17. The compensating valve spring 18 is connected between the compensating valve seat 19 and the compensating valve core 17. The middle end of the pressure compensating valve core is connected to the P port through the oil passage 27. The valve core 20 passes through the oil passage 27 to control whether the oil passage 27 is connected or not.

[0021] The oil channel 27 includes an annular oil channel and an offset oil channel. The annular oil channel is directly connected to the P port and is connected to the compensation valve spool 17 through the offset oil channel. The valve spool 20 has an annular oil channel and an offset oil channel. A boss is provided on the valve spool 20, and a throttle groove 26 is provided on the boss. The throttle groove 26 is used to control the flow rate between the annular oil channel and the offset oil channel.

[0022] Bridge oil passages 24 are provided on each side of the pressure compensating valve spool. Oil passages 25 are provided between the left bridge passage and oil passage A, and between the right bridge passage and oil passage B. The left bridge passage and oil passage A are connected via oil passages 25, while the right bridge passage and oil passage B are connected via oil passages 25. Oil passages 25 are connected to port T. Valve spool 20 passes through these passages, controlling the flow between these two passages and between port T. Safety valves 14 are provided in oil passages A and B, respectively.

[0023] A first pilot proportional pressure-reducing valve 22 and a second pilot proportional pressure-reducing valve 23 are provided on the side of the main valve body 7 corresponding to the pressure-reducing valve 1 of the oil inlet connection 2. These first and second electric proportional pressure-reducing valves 22 and 23 are connected to the pressure-reducing valve 1 and are used to control the pilot oil pressure entering both sides of the valve core 20, thereby controlling the left and right movement of the valve core 20. When the first and second electric proportional pressure-reducing valves 22 and 23 are energized, controlling the current applied to them controls the valve core opening, thereby controlling the pilot oil flow rate and the pressure on both sides of the valve core 20. Pilot oil passages 13 for guiding pilot oil are provided on either side of the main valve body 7. These passages 13 run along the thickness of the main valve body 7 and are perpendicular to the valve core 20. When multiple main valve bodies 7 are connected in series, the pilot oil passages 13 are connected in series, and the pilot oil control oil enters each main valve body 7 through the pilot oil passages 13.

[0024] On the main valve body 7, there is a rotatable handle on the other side opposite to the first electric proportional pressure-reducing valve 22 and the second electric proportional pressure-reducing valve 23. The end of the valve core 20 close to the handle is connected to a plug 10. The tail of the plug 10 has an L-shaped connecting plate to form a groove at the tail of the plug. The handle is inserted into the groove. The valve core 20 can be pushed left and right through the plug 10 by rotating the handle. A spring 11 is installed on the outside of the plug 10 through a spring seat 12. The spring 11 is used to push the valve core 20 to reset.

[0025] Flow sensors 8 and pressure sensors 9 are installed on either side of main valve body 7. Their probes extend into oil passages A and B, located between the openings of oil passages A and B and safety valve 14, to detect the flow and pressure in oil passages A and B. Flow sensors 8 and pressure sensors 9 are electrically connected to first and second electric proportional pressure-reducing valves 22 and 23.

[0026] When the multi-way control valve is connected to the oil circuit, the hydraulic oil reaches the oil chamber of the main valve body 7 through the oil inlet 3. When the valve core 20 is in the middle position, the oil is discharged from the unloading valve on the side of the oil inlet link 2. During operation, the pilot oil pushes the valve core 20 to change direction / position. When the valve core 20 moves to the right, the hydraulic oil will open the pressure compensation valve core 17 through the oil channel 27, and then pass through the bridge oil channel 24, oil channel 25, and oil channel A on the left side to enter the working chamber of the actuator. At the same time, the bridge oil channel 24 and oil channel 25 on the right side are disconnected, and oil channel B is connected to oil channel 25. The oil in the other chamber of the actuator returns to the oil tank through oil channel B, oil channel 25, and port T.

[0027] Flow sensor 8 is used to detect the oil flow in oil channels A and B to precisely control the actuator, while pressure sensor 9 is used to detect the actuator load. Pressure sensor 9 and flow sensor 8 receive the actual output pressure and flow, which are then transmitted to the host computer via signal feedback. The host computer then adjusts the current applied to the first electric proportional pressure reducing valve 22 / second electric proportional pressure reducing valve 23 based on the set flow rate. If the control valve core 20 senses unsaturated flow, the current applied to the first electric proportional pressure reducing valve 22 / second electric proportional pressure reducing valve 23 is compensated. The pilot oil pressure is proportional to the force pushing the valve core. The greater the current of the electric proportional pressure reducing valve, the larger the opening of the valve core movement, and the greater the pilot oil flow. This increases the feedback mechanism, provides fast response, and offers high precision, enabling excellent control of the hydraulic cylinder's extension and retraction speed.

Claims

1. A multi-way control valve, characterized in that: The invention comprises a main valve body (7), wherein the top of the main valve body (7) is provided with oil passages A and B for connecting to the actuator on both sides, the bottom is provided with a P port and a T port for connecting to the oil tank and the oil pump, and the middle is provided with a valve core (20) for controlling the on-off between the oil passages A, the oil passages B, the P port and the T port; the outer side of the main valve body (7) is provided with a proportional pressure reducing valve and a flow sensor (8) for controlling the left and right movement of the valve core (20), the flow sensor (8) extends into the oil passages A and B, and the flow sensor (8) and the proportional pressure reducing valve are electrically connected.

2. The multi-way control valve according to claim 1, characterized in that: A pressure sensor (9) is provided on the outer side of the main valve body (7), and the pressure sensor (9) extends into the oil passages A and B. The pressure sensor (9) is electrically connected to the proportional pressure reducing valve.

3. The multi-way control valve according to claim 1, characterized in that: The T port is located on both sides of the P port. A pressure compensation valve is provided between the oil passage A and the oil passage B. The middle of the valve core end of the pressure compensation valve is connected to the P port through the first oil passage (27). The two sides are connected to the oil passage A and the oil passage B in sequence through the bridge oil passage (24), the second oil passage (25), and the T port. The valve core (20) passes through the first oil passage (27), the bridge oil passage (24), and the second oil passage (25) to control the on-off between the P port and the first oil passage (27), between the bridge oil passage (24) and the second oil passage (25), and between the second oil passage (25) and the T port.

4. The multi-way control valve according to claim 3, characterized in that: The first oil passage (27) includes an annular oil passage and an offset oil passage. The middle of the valve core end of the pressure compensation valve is connected in sequence through the first oil passage (27), the annular oil passage and the P port. The valve core (20) passes through the annular oil passage and the offset oil passage, and a throttling groove (26) is provided in the middle for controlling the flow rate of the annular oil passage and the offset oil passage.

5. The multi-way control valve according to claim 1, characterized in that: Pilot oil passages (13) for guiding pilot oil are respectively provided on both sides of the main valve body (7), and the pilot oil passages are arranged along the thickness direction of the main valve body (7).

6. The multi-way control valve according to claim 1, characterized in that: Oil passages A and B are respectively provided with safety valves (14).

7. The multi-way control valve according to claim 1, characterized in that: The outer side of the main valve body (7) is provided with a handle for driving the valve core (20) to move left and right, and the proportional pressure reducing valve and the handle are located on opposite sides of the main valve body.

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