Three-position four-way hydraulic proportional valve based on high-speed on-off valve

Abstract

The present invention belongs to the technical field of valve bodies, and relates to a three-position four-way hydraulic proportional valve based on a high-speed switch valve, comprising a valve block, on which four groups of main valve core assemblies are installed, each group of the main valve core assemblies is respectively matched with a group of pilot valve assemblies at the upper end, and each group of pilot valve assemblies is matched with an electromagnet assembly at the upper end; the main valve assembly comprises a main valve core with a sliding seal arranged in the inner hole of the valve block, a damper is arranged at the lower part of the inner cavity of the main valve core, a main valve core preload spring is arranged above the damper, and a main valve core seat cushion is arranged between the bottom surface of the main valve core and the inner hole of the valve block to form a soft seal. The proportional valve can effectively meet the requirements of the operating environment, and the valve core has a fast response speed.

Description

Technical Field

[0001] The invention belongs to the technical field of valve bodies and relates to a three-position four-way water pressure proportional valve based on a high-speed switching valve. Background Art

[0002] Water hydraulic transmission technology has attracted widespread attention due to its safety, environmental protection and many other advantages. With the continuous improvement of the categories and specifications of water hydraulic components, its application scope is also expanding.

[0003] As the core component of hydraulic transmission, the proportional valve works by utilizing electromechanical conversion mechanisms such as proportional solenoids and stepper motors to drive the movement of the valve core, causing the displacement of the valve core to change proportionally, thereby controlling the proportional change of the flow rate through the valve port, and has high control requirements.

[0004] The traditional proportional valve core structure is mainly a sliding valve type, which has high requirements on the matching of the valve core and valve sleeve. Due to the small matching clearance, poor anti-pollution ability and easy sticking, the operating environment is relatively strict.

[0005] Traditional proportional valves mostly use oil as the medium. Today, when green environmental protection is strongly advocated, the advantages of water hydraulics are gradually becoming more prominent, especially in marine equipment, where water hydraulics has great potential. Summary of the invention

[0006] In view of the above problems, the present invention provides a three-position four-way water pressure proportional valve based on a high-speed switch valve. The proportional valve can effectively meet the requirements of the operating environment and has a fast valve core response speed.

[0007] According to the technical solution of the present invention: a three-position four-way hydraulic proportional valve based on a high-speed switch valve is characterized in that: it includes a valve block, four groups of main valve core components are installed on the valve block, and each group of the main valve core components is respectively provided with a group of pilot valve components on the upper end, and each group of pilot valve components is provided with an electromagnet component on the upper end;

[0008] The main valve assembly comprises a main valve core with a sliding seal arranged in the inner hole of the valve block, a damper is arranged at the lower part of the inner cavity of the main valve core, a main valve core preload spring is arranged above the damper, and a main valve core seat cushion is arranged between the bottom surface of the main valve core and the inner hole of the valve block to form a soft seal;

[0009] The pilot valve assembly includes a pilot valve core, a pilot valve seat, and a pilot valve body. The upper part of the pilot valve body is tightly fitted in the center hole of the electromagnet assembly to guide the movement of the armature in the electromagnet assembly. The pilot valve core sealing spring and the pilot valve core are sequentially arranged in the vertical hole at the lower part of the armature. The lower part of the pilot valve body fixes the pilot valve core gasket to limit the pilot valve core. The pilot valve core cooperates with the cone mouth of the pilot valve seat to form a surface seal to control the on-off of the axial hole of the pilot valve seat. The pilot valve seat is arranged in the threaded hole of the valve block.

[0010] As a further improvement of the present invention, four mounting holes are arranged on the valve block, and the main valve core assembly is installed in the corresponding mounting holes.

[0011] As a further improvement of the present invention, a sliding seal is performed between the main valve core and the inner hole of the valve block via a Gly ring.

[0012] As a further improvement of the present invention, the damper is threadedly connected to the lower part of the inner cavity of the main valve core, and a mounting hole is provided at the upper part of the inner cavity of the main valve core to install a pre-tightening spring of the main valve core.

[0013] As a further improvement of the present invention, the electromagnet assembly includes a pole shoe and an armature, a pilot valve core pre-tightening spring is arranged between the armature and the pole shoe, and the armature guide is arranged in the inner hole of the pilot valve body; the pole shoe and the armature are placed in the inner hole of the electromagnet shell, and a first skeleton and a second skeleton are arranged in the electromagnet shell, wherein the first skeleton has a first coil built in, and the second skeleton has a second coil built in, an electromagnet end cover is arranged at the lower opening end of the electromagnet shell, a pressure cover is arranged on the top surface of the electromagnet shell, the upper part of the pole shoe extends into the pressure cover, and is fixedly connected to the pressure cover by fastening screws, and an air gap is left between the pole shoe and the armature.

[0014] As a further improvement of the present invention, the main valve core includes a first main valve core and a second main valve core, wherein the end face of the first main valve core is provided with an axial through hole, the axial through hole is connected to port A and port B respectively, and the second main valve core is provided with a radial through hole, the radial through hole is connected to port P.

[0015] As a further improvement of the present invention, a damping hole is arranged on the end surface of the damper.

[0016] As a further improvement of the present invention, a radial hole is provided in the arc-shaped groove extending axially on the surface of the armature.

[0017] The technical effect of the present invention is as follows: the present invention has a simple and compact structure, and adopts a three-position four-way water pressure proportional valve design based on a high-speed switch valve, thereby avoiding the problems of valve core jamming and valve port leakage in traditional proportional valves. The present invention adopts a high-speed switch valve as a pilot stage, which improves the anti-pollution ability of the valve core while improving the valve core response speed and valve output flow control accuracy. The armature and pole shoe of the present invention are both made of Permalloy soft magnetic material, which has high magnetic permeability, low coercive force, good rust resistance and processing performance. The present invention has radial small holes on the armature, and high-pressure water flow acts on both ends of the pilot valve core at the same time, forming a dynamic pressure balance structure, which improves the sealing performance while greatly reducing the preload force and electromagnetic force of the pilot valve core reset spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 The cross-sectional view of the present invention Figure 1 .

[0020] Figure 3 The cross-sectional view of the present invention Figure 2 .

[0021] Figure 4 It is a schematic diagram of the armature structure.

[0022] Figure 5 It is a schematic diagram of the structure of the first main valve core.

[0023] Figure 6 It is a schematic diagram of the structure of the second main valve core.

[0024] Figure 7 Schematic diagram of the damper structure. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figures 1 to 7 The valve block includes a first mounting screw 1, a valve block 2, a first ball expansion plug 3, a second mounting screw 4, a second ball expansion plug 5, a third ball expansion plug 6, a fourth ball expansion plug 7, a fifth ball expansion plug 8, a third mounting screw 9, a fourth mounting screw 10, a T port 11, an A port 12, a B port 13, a P port 14, a first main valve core 15, a second main valve core 16, a fastening screw A1, a gland A2, a pole shoe A3, and an electromagnet housing A 4. First skeleton A5, first coil A6, second coil A7, pilot valve return spring A8, second skeleton A9, solenoid end cover A10, armature A11, pilot valve core sealing spring A12, pilot valve body A13, pilot valve core A14, pilot valve core gasket A15, pilot valve seat A16, pilot valve seat screw plug A17, main valve core pre-tightening spring A18, grid ring A19, damper A20, main valve core seat cushion A21, etc.

[0027] like Figures 1 to 7 As shown, the present invention is a three-position four-way water pressure proportional valve based on a high-speed switch valve, comprising a valve block 2, on which four groups of main valve core assemblies are installed, and each group of the main valve core assemblies is respectively provided with a group of pilot valve assemblies on the upper end, and each group of pilot valve assemblies is provided with an electromagnet assembly on the upper end;

[0028] The main valve assembly includes a main valve core with a sliding seal arranged in the inner hole of the valve block 2, a damper A20 is arranged at the lower part of the inner cavity of the main valve core, a main valve core preload spring A18 is arranged above the damper A20, and a main valve core seat cushion A21 is arranged between the bottom surface of the main valve core and the inner hole of the valve block 2 to form a soft seal;

[0029] The pilot valve assembly includes a pilot valve core A14, a pilot valve seat A16, and a pilot valve body A13. The upper part of the pilot valve body A13 is tightly fitted in the center hole of the electromagnet assembly to guide the movement of the armature A11 in the electromagnet assembly. The pilot valve core sealing spring A12 and the pilot valve core A14 are arranged in the vertical hole at the lower part of the armature A11 in sequence. The lower part of the pilot valve body A13 fixes the pilot valve core gasket A15 to limit the pilot valve core A14. The pilot valve core A14 cooperates with the cone mouth of the pilot valve seat A16 to form a surface seal to control the on-off of the axial hole of the pilot valve seat A16. The pilot valve seat A16 is arranged in the threaded hole of the valve block 2.

[0030] Four mounting holes are arranged on the valve block 2, and the main valve core assembly is installed in the corresponding mounting holes.

[0031] The main valve core and the inner hole of the valve block 2 are slidingly sealed by a Gly ring A19.

[0032] The damper A20 is threadedly connected to the lower part of the inner cavity of the main valve core, and a mounting hole is arranged at the upper part of the inner cavity of the main valve core to install the main valve core preload spring A18.

[0033] like Figure 4 As shown, the electromagnet assembly includes a pole shoe A3 and an armature A11, a pilot valve core preload spring A8 is arranged between the armature A11 and the pole shoe A3, and the armature A11 is guided and arranged in the inner hole of the pilot valve body A13; the pole shoe A3 and the armature A11 are placed in the inner hole of the electromagnet housing A4, and a first skeleton A5 and a second skeleton A9 are arranged in the electromagnet housing A4, wherein the first skeleton A5 has a built-in first coil A6, and the second skeleton A9 has a built-in second coil A7, an electromagnet end cover A10 is arranged at the lower opening end of the electromagnet housing A4, a pressure cover A2 is arranged on the top surface of the electromagnet housing A4, the upper part of the pole shoe A3 extends into the pressure cover A2, and is fixedly connected with the pressure cover A2 by fastening screws A1, and an air gap is left between the pole shoe A3 and the armature A11. It can be understood that in specific practice, only one set of skeleton and coil combination can be arranged inside the electromagnet housing A4 as needed.

[0034] like Figure 1 , 2 As shown in Figures 5 and 6, the main valve core includes a first main valve core 15 and a second main valve core 16, wherein the end surface of the first main valve core 15 is provided with an axial through hole 19, which is respectively connected to the A port 12 and the B port 13, and the second main valve core 16 is provided with a radial through hole 20, which is connected to the P port 14. During operation, for the first main valve core 15, water flows through the A port 12 or the B port 13 into the damper A20, generating a pressure difference to push the first main valve core 15 to flow to the T port 11; for the second main valve core 16, water flows through the P port 14 to the damper A20, generating a pressure difference to push the second main valve core 16 to flow to the A port 12 or the B port 13.

[0035] like Figure 4 As shown, a radial hole 17 is arranged in the arc-shaped groove extending axially on the surface of the armature A8. The radial hole 17 introduces water flow to the top of the pilot valve core A14, so that the pressure on the upper and lower sides of the pilot valve core A14 is balanced, making the pilot valve port seal more reliable.

[0036] like Figure 7 As shown, the end surface of the damper A20 is provided with a damping hole 18. The damping hole 18 is an axial elongated hole. When working, a pressure difference is generated when water flows through the elongated damping hole 18. Threads are tapped on the outer periphery of the damper A20 to facilitate its disassembly and replacement.

[0037] In the present invention, the maximum working air gap between the armature A11 and the pole shoe A3 is set to 1mm; the distances between the first main valve core 15, the second main valve core 16 and the pilot valve seat A16 are all set to 2.5mm. During operation, the pilot valve is opened, and the water flows through the damper A20 to the pilot valve cavity, and then flows into the T port 11 from the pilot valve port. When the water flows, a pressure difference is generated at both ends of the damper A20, which pushes the main valve core to move and open the main valve port.

[0038] During the actual installation operation of the present invention, firstly, the main valve core seat cushion A21 is pressed into the inner hole of the valve block 2, and then the main valve core with the Gly ring A19 and the damper A20 installed is installed into the inner hole of the valve block 2, and the main valve core preload spring A18 is installed into the main valve core spring installation hole. After the O-ring is installed on the pilot valve seat A16, they are screwed into the inner hole of the valve block 2 together, and cooperate with the main valve core preload spring A18 to generate a preload force; first, the valve core sealing spring A12 and the pilot valve core A14 are installed together in the inner hole of the armature A11, and the pilot valve core gasket A15 is welded to the armature A11 to support the pilot valve core A14, and then the installed The armature A11 and the pilot valve core return spring A8 are installed into the welded pole shoe A3 and the pilot valve body A13 guide sleeve, and the armature A11 is pulled to test whether it can move flexibly in the pilot valve body A13; the first coil A6 and the second coil A7 are respectively wound on the first frame A5 and the second frame A9, and installed together into the electromagnet housing A4, and the electromagnet end cover A10 is fixed to the end of the electromagnet housing A4; the installed electromagnet coil assembly is inserted into the pole shoe A3, and the pressure cover A2 is inserted into the pole shoe A3, and the electromagnet coil assembly is pressed at the same time; finally, the fastening screw A1 is screwed into the threaded hole of the pole shoe A3. At this point, the assembly of the three-position four-way water pressure proportional valve based on the high-speed switch valve is completed.

[0039] The working principle of the present invention is as follows: the pilot valve body A13 wrapped with the armature A11 and the pole shoe A3 is inserted into the central hole of the electromagnet, the magnetic circuit of the pole shoe A3 and the armature A11 is effectively connected, and a closed magnetic circuit is formed with the electromagnet housing A4. After power is turned on, the electromagnetic field generated in the coil passes through the coil to effectively connect the armature A11, the pole shoe A3 and the electromagnet end cover A10 into a sleeve mechanism. Under the action of the electromagnetic field, a vertical upward suction force can be generated, so that the armature A11 is forced to move upward, thereby opening the pilot valve port, and the high-pressure water flows through the damper A20 from the pilot valve port into the T port 11, thereby pushing the main valve core and opening the main valve port; when the electromagnet is not energized , the armature A11 loses the effect of electromagnetic force, and moves downward under the action of the pilot valve core reset spring A8, pushing the armature to reset, thereby closing the pilot valve port, the water stops flowing, and the damping hole loses the ability to generate a pressure difference. Under the action of the main valve core preload spring A18, the main valve core resets and the main valve port is closed; when the pilot stage high-speed switching valve operates at a high frequency, a discrete switching signal is converted into a continuous flow signal, and then its duty cycle is adjusted, the pilot stage flow rate changes accordingly, and the main valve core opens and closes accordingly under the effect of the damper, the main valve core stroke changes proportionally, the main valve port opening changes proportionally, and the main valve port flow changes proportionally.

Claims

1. A three-position four-way hydraulic proportional valve based on a high-speed switching valve, characterized in that: It comprises a valve block (2), on which four groups of main valve core assemblies are mounted, each group of main valve core assemblies having a group of pilot valve assemblies arranged on the upper end thereof, and each group of pilot valve assemblies having an electromagnet assembly mounted on the upper end thereof; The main valve core assembly comprises a main valve core which is slidingly sealed and arranged in the inner hole of the valve block (2); a damper (A20) is arranged at the lower part of the inner cavity of the main valve core; a main valve core preload spring (A18) is arranged above the damper (A20); and a main valve core seat cushion (A21) is arranged between the bottom surface of the main valve core and the inner hole of the valve block (2) to form a soft seal; The pilot valve assembly comprises a pilot valve core (A14), a pilot valve seat (A16), and a pilot valve body (A13). The upper portion of the pilot valve body (A13) is tightly fitted in the central hole of the electromagnet assembly to guide the movement of the armature (A11) in the electromagnet assembly. A pilot valve core sealing spring (A12) and a pilot valve core (A14) are sequentially arranged in the vertical hole at the lower portion of the armature (A11). A pilot valve core gasket (A15) is fixed at the lower portion of the pilot valve body (A13) to limit the position of the pilot valve core (A14). The pilot valve core (A14) and the conical opening of the pilot valve seat (A16) are matched to form a surface seal to control the on-off of the axial hole of the pilot valve seat (A16). The pilot valve seat (A16) is arranged in a threaded hole of the valve block (2). The electromagnet assembly comprises a pole shoe (A3) and an armature (A11), a pilot valve core preload spring (A8) is arranged between the armature (A11) and the pole shoe (A3), and the armature (A11) is guided and arranged in the inner hole of the pilot valve body (A13); the pole shoe (A3) and the armature (A11) are placed in the inner hole of the electromagnet housing (A4), a first frame (A5) and a second frame (A9) are arranged in the electromagnet housing (A4), wherein the first frame (A5) has a first coil (A6) built in, and the second frame (A9) has a second coil (A7) built in, an electromagnet end cover (A10) is arranged at the lower opening end of the electromagnet housing (A4), a pressure cover (A2) is arranged on the top surface of the electromagnet housing (A4), the upper part of the pole shoe (A3) extends into the pressure cover (A2), and is fixedly connected to the pressure cover (A2) by fastening screws (A1), and an air gap is left between the pole shoe (A3) and the armature (A11); The main valve core comprises a first main valve core (15) and a second main valve core (16), wherein an end surface of the first main valve core (15) is provided with an axial through hole (19), the axial through hole (19) being connected to the A port (12) and the B port (13) respectively, and the second main valve core (16) is provided with a radial through hole (20), the radial through hole (20) being connected to the P port (14).

2. The three-position four-way hydraulic proportional valve based on a high-speed switching valve according to claim 1, characterized in that: Four mounting holes are provided on the valve block (2), and the main valve core assembly is installed in the corresponding mounting holes.

3. The three-position four-way hydraulic proportional valve based on a high-speed switching valve according to claim 1, characterized in that: The main valve core and the inner hole of the valve block (2) are slidably sealed by a Gly ring (A19).

4. The three-position four-way hydraulic proportional valve based on a high-speed switching valve according to claim 1, characterized in that: The damper (A20) is threadedly connected to the lower part of the main valve core inner cavity, and a mounting hole is provided at the upper part of the main valve core inner cavity for mounting the main valve core preload spring (A18).

5. The three-position four-way hydraulic proportional valve based on a high-speed switching valve according to claim 1, characterized in that: A damping hole (18) is provided on the end surface of the damper (A20).

6. The three-position four-way hydraulic proportional valve based on a high-speed switching valve according to claim 1, characterized in that: A radial hole (17) is provided in an arc-shaped groove extending axially on the surface of the armature (A11).

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