Two-position three-way electromagnetic valve

Abstract

The utility model provides a two-position three-way electromagnetic valve, which belongs to the technical field of valves and comprises a valve body, an oil inlet and two oil outlets are arranged on the valve body, and the two oil outlets are vertically arranged on the valve body. A control piston capable of sliding up and down along the inner wall of the valve body is arranged in the valve body, and a flow guide opening corresponding to the oil outlet is formed in the control piston. The utility model can effectively solve the problem of oil path distribution, is particularly used for large-flow and low-flow-resistance application scenes, and compared with the design of the current solid piston motion mode, the applied flow range is larger, the generated flow resistance is smaller, the control is more accurate, and the processing requirements on the valve core and the valve body are low due to the concentric design; the balance hole enables the stress of the valve core to be balanced, and the valve is irrelevant to the working pressure of a working system and only relevant to electromagnetic force and spring force, so that the electromagnetic force demand is smaller, the size of a required coil is smaller, and the valve has the incomparable advantage in cost compared with a conventional design.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a two-position three-way solenoid valve. Background Art

[0002] A solenoid valve is an industrial device controlled by electromagnetics and is a fundamental component of automation used to control fluids. When a solenoid valve is used to control an oil circuit, when the solenoid valve is de-energized, oil can flow through the valve body to the control oil circuit. However, when the valve is energized, the solenoid valve's moving iron core moves the valve core, closing the valve body's oil port and preventing oil from reaching the control oil circuit. Existing solenoid valves control the opening and closing of the valve port through the movement of a solid valve core. However, this design introduces significant flow resistance, and when fluid flows through the valve core, the large contact area causes uneven force on the valve core, resulting in imprecise and unstable control of the valve core. Utility Model Content

[0003] In order to make up for the above shortcomings, the utility model provides a two-position three-way solenoid valve, which aims to improve the problems in the existing technology such as the excessive flow resistance when the solenoid valve is used as a large flow valve, resulting in pressure loss, and the uneven force on the valve core caused by the large contact area, the unbalanced force on the valve core, the required electromagnetic force is too large, or it cannot be applied to high-pressure systems, and further, in the design of the existing valve, the valve core control is inaccurate.

[0004] The utility model is implemented as follows: the utility model provides a two-position three-way solenoid valve, comprising a valve body, wherein the valve body is provided with an oil inlet and two oil outlets, and the two oil outlets are arranged up and down on the valve body;

[0005] The valve body is provided with a control piston which can slide up and down along the inner wall of the valve body, and the control piston is provided with a guide port corresponding to the oil outlet;

[0006] The control piston is directly or indirectly controlled by a moving iron core arranged below the control piston.

[0007] Preferably, the oil inlet is arranged at the upper end of the valve body or the middle of the control piston.

[0008] Preferably, the control piston is a bottom-sealed sunken trough structure, and the guide port is provided on the side wall of the control piston and is communicated with the interior of the control piston.

[0009] Preferably, a pressure ring is installed on the top of the inner wall of the valve body, and an elastic reset member is connected between the pressure ring and the control piston.

[0010] Preferably, the elastic return member is a return spring.

[0011] Preferably, the opening heights of the two oil outlets are the same.

[0012] Preferably, the distance between the two guide ports is equal to the distance between the two oil outlets plus the opening height of one oil outlet.

[0013] Preferably, an outer shell and an end cover are provided at one end of the valve body away from the pressure ring, and the end cover is connected to the outer shell.

[0014] Preferably, the moving iron core is arranged in the housing, and a coil and a static iron core are also arranged in the housing, and both the static iron core and the moving iron core are arranged in the coil;

[0015] The control piston and the moving iron core are connected via a push rod, and the push rod slides up and down in the static iron core.

[0016] Preferably, a magnetic isolation sleeve is provided below the static iron core, and the movable iron core slides in the magnetic isolation sleeve.

[0017] Preferably, at least one balancing hole is provided at the end of the control piston.

[0018] The beneficial effects of the utility model are:

[0019] In this utility model, pressurized oil enters the piston bore through both ends of the control piston. There, it awaits the movement of the valve core, where it reaches either port A1 or A2, achieving a dual-path flow of pressurized oil. Simultaneously, the proportional movement of the piston is controlled to distribute the high-pressure oil in the piston bore proportionally between ports A1 and A2. This means that as the flow rate at port A1 increases, the flow rate at port A2 decreases, or vice versa. Furthermore, by controlling the up-and-down movement of the piston within the valve body, the flow rate at either port A1 or A2 can be fully switched on and off, controlling the forces acting on both ends of the piston.

[0020] In addition, the control piston of the utility model is provided with a balancing hole, a sliding mouth, and there is a gap between the push rod and the static iron core, so that the hydraulic oil fills the internal space of the valve body so that the pressure everywhere inside the valve body is the same and the internal pressure is balanced, so that the force on the control piston and the moving iron core is independent of the external pressure, and the movement of the control piston and the moving iron core is only affected by the electromagnetic force and elastic force after the coil is energized, so the solenoid valve works stably.

[0021] The utility model can effectively solve the problem of oil circuit distribution, and is particularly suitable for application scenarios with large flow and low flow resistance. Compared with the current solid piston movement design, the application flow range is larger, the flow resistance generated is smaller, and the control is more precise. At the same time, due to the concentric design, the processing requirements for the valve core and the valve body are low; the application of the balance hole makes the force on the valve core balanced, so that the valve of the utility model is independent of the working pressure of the working system, and is only related to the electromagnetic force and the spring force, so that the electromagnetic force demand is smaller and the required coil size is smaller, thereby having a cost advantage that conventional designs cannot match. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the structure of a two-position three-way solenoid valve provided by an embodiment of the present utility model;

[0024] Figure 2 This is a diagram of the initial state of the two-position three-way solenoid valve provided in the first embodiment of the present invention;

[0025] Figure 3 This is a diagram of the power-on state of the two-position three-way solenoid valve provided in the first embodiment of the present invention;

[0026] Figure 4 This is a diagram of the initial state of the two-position three-way solenoid valve provided in the second embodiment of the present invention;

[0027] Figure 5 This is a diagram of the power-on state of the two-position three-way solenoid valve provided in the second embodiment of the present invention.

[0028] In the figure: 1. Valve body; 2. Oil outlet; 20. Oil outlet A; 21. Oil outlet B; 3. Control piston; 4. Guide port; 40. Guide port A; 41. Guide port B; 5. Press ring; 6. Elastic reset member; 7. Moving iron core; 8. Push rod; 9. Housing; 10. End cover; 11. Static iron core; 12. Magnetic isolation sleeve; 13. Balancing hole; 14. Coil; 15. Bracket; 16. Oil inlet. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1

[0031] Reference Figure 1-Figure 3 , two-position three-way solenoid valve, including valve body 1, the valve body 1 is a hollow structure. One end of the valve body 1 is open and the other end is closed. The open end of the valve body 1 is the liquid inlet. Figure 1 From the perspective of direction, the upper end of the valve body 1 is the liquid inlet.

[0032] It should be noted that: a closed end of the valve body 1 is provided with a shell 9 and an end cover 10 , and the end cover 10 is connected to the shell 9 , and the end cover 10 has a sealing effect.

[0033] There are two oil outlets 2 on the side wall of the open end of the valve body 1. The two oil outlets 2 are arranged on the valve body 1 vertically and perpendicular to the side wall of the valve body 1. Figure 2 and Figure 3 The two oil outlets 2 are oil outlet A20 and oil outlet B21, and oil outlet A20 is arranged above oil outlet B21.

[0034] It should be noted that the opening heights of the oil outlet A20 and the oil outlet B21 are the same.

[0035] A control piston 3 is provided in the valve body 1 and can slide up and down along the inner wall of the valve body 1 , wherein the outer wall of the control piston 3 slides against the inner wall of the valve body 1 .

[0036] The control piston 3 is a sunken trough structure with a sealed bottom, and the inner cavity of the trough of the control piston 3 is used for the flow of hydraulic oil.

[0037] The control piston 3 is provided with a guide port 4 corresponding to the oil outlet 2. The guide port 4 is arranged on the side wall of the control piston 3 and is connected to the inside of the control piston 3, so that the hydraulic oil in the inner cavity of the groove of the control piston 3 flows to the oil outlet 2 through the guide port 4 and is then discharged from the valve body 1.

[0038] Furthermore, the guide port 4 is respectively a guide port A40 and a guide port B41, wherein the guide port A40 corresponds to the oil outlet A20, and when the guide port A40 and the oil outlet A20 overlap to form an A1 port, the formed A1 port is used to discharge the hydraulic oil in the inner cavity of the groove body of the control piston 3 out of the valve body 1; when the guide port B41 and the oil outlet B21 correspond, when the guide port B41 and the oil outlet B21 overlap to form an A2 port, the formed A2 port is used to discharge the hydraulic oil in the inner cavity of the groove body of the control piston 3 out of the valve body 1.

[0039] It should be noted that the distance between the two guide ports A40 and the guide port B41 = the distance between the two oil outlets 2 + the opening height of the oil outlet 2, where the distance between the two oil outlets 2 is recorded as C, and the opening height of the oil outlet 2 is recorded as D. The distance between the guide port A40 and the guide port B41 = C + D. In this way, the flow state of the A1 port and the A2 port is adjusted during actual operation. There are four flow states between the A1 port and the A2 port:

[0040] 1. Port A1 is open and port A2 is closed. At this time, the flow guide port A40 completely overlaps with the oil outlet port A20, and the flow guide port B41 does not overlap with the oil outlet port B21.

[0041] 2. Port A1 is closed and port A2 is open. At this time, the flow guide port A40 and the oil outlet port A20 do not overlap at all, and the flow guide port B41 and the oil outlet port B21 completely overlap;

[0042] 3. Ports A1 and A2 are connected. At this time, the flow guide port A40 partially overlaps with the oil outlet port A20, and the flow guide port B41 partially overlaps with the oil outlet port B21.

[0043] 4. Port A1 is closed, and port A2 is closed. At this time, the guide port A40 and the oil outlet A20 do not overlap at all, and the guide port B41 and the oil outlet B21 do not overlap at all.

[0044] The control piston 3 is braked by the movable iron core 7 , causing the control piston 3 to slide upward along the inner wall of the valve body 1 .

[0045] Reference Figure 1-Figure 3 The moving iron core 7 is arranged in the housing 9, and a coil 14 is also arranged in the housing 9. The static iron core 11 and the moving iron core 7 are both arranged in the coil 14.

[0046] Furthermore, the coil 14 is connected to the power supply, the coil 14 is mounted on the valve body 1, and the static iron core 11 is located inside the coil 14. When the coil 14 is energized, it forms an electromagnet with the static iron core 11. Figure 3 When viewed from the direction of , after the coil 14 is energized, the coil 14 and the static iron core 11 form an electromagnet, which generates suction on the moving iron core 7. Under this suction, the moving iron core 7 is actuated to move upward to open the A2 port.

[0047] Furthermore, the sliding trajectory of the movable iron core 7 is located within the coil 14. When the coil 14 is energized, the coil 14, the static iron core 11, and the movable iron core 7 form an electromagnet. Since the opposite ends of the static iron core 11 and the movable iron core 7 have opposite magnetic poles, the static iron core 11 and the movable iron core 7 are attracted to each other, and the suction force exerted on the movable iron core 7 is stronger than that of the electromagnet composed of only the coil 14 and the static iron core 11.

[0048] In addition, the valve body 1 and the housing 9 are fixed together by a bracket 15. The solenoid valve of the present invention is fixed in the required installation position by the bracket 15. The housing 9 is provided with a sliding cavity and a coil-accommodating annular gap surrounding the sliding cavity. The coil 14 is installed in the coil-accommodating annular gap. A magnetic isolation sleeve 12 is provided below the static iron core 11. The movable iron core 7 slides in the magnetic isolation sleeve 12. The magnetic isolation sleeve 12 is installed in the sliding cavity. The static iron core 11 is fixed to the end of the valve body 1 fixed to the bracket 15. The static iron core 11 is located between the valve body 1 and the housing 9. The movable iron core 7 is slidably installed in the magnetic isolation sleeve 12.

[0049] Furthermore, a sealing ring is provided in the valve body 1, and one end of the magnetic isolation sleeve 12 facing the valve body 1 is folded toward the outside of the magnetic isolation sleeve 12, and the folded edge overlaps with the side of the bracket 15 facing the valve body 1, so as to Figure 3 From the direction of , the upper side of the magnetic isolation sleeve 12 is folded, and the folded side overlaps the upper side of the bracket 15. The sealing ring is located between the valve body 1 and the folded edge of the magnetic isolation sleeve 12.

[0050] This embodiment further discloses a reset structure for the control piston 3 when the coil 14 loses power, so as to ensure that the movement of the control piston 3 can freely switch the flow state of the A1 port and the A2 port.

[0051] Preferably, the reset structure of the control piston 3 is a pressure ring 5 provided on the top of the inner wall of the valve body 1 , and an elastic reset member 6 is connected between the pressure ring 5 and the control piston 3 .

[0052] It should be added that the pressure ring 5 is hollow to prevent the pressure ring 5 from blocking the oil inlet 16 at the upper end of the valve body 1 from flowing.

[0053] Reference Figure 1-Figure 3 The pressure ring 5 is hollow and has a through-hole structure, and the outer wall of the pressure ring 5 is provided with an internal thread, and the top of the inner wall of the valve body 1 is provided with an external thread matching the external thread. The pressure ring 5 is preferably connected to the liquid inlet of the valve body 1 by thread, which helps to disassemble the pressure ring 5 and also helps to disassemble the elastic reset member 6.

[0054] In this embodiment, the elastic return member 6 is preferably a return spring, wherein the two ends of the return spring are respectively arranged at the bottom of the pressure ring 5 and the top of the control piston 3. Furthermore, the two ends of the return spring are provided with vertical ends, and the bottom of the pressure ring 5 and the top of the control piston 3 are provided with plug-in grooves for inserting the vertical ends of the return spring, wherein the vertical ends of the two ends of the return spring are perpendicular to the bottom of the pressure ring 5 and the top of the control piston 3. In this way, after the two ends of the vertical ends of the return spring are inserted into the plug-in grooves, the stability of the return spring is ensured and the quick installation of the return spring is facilitated.

[0055] Finally, the control piston 3 and the moving iron core 7 are connected by a push rod 8, which slides up and down inside the static iron core 11. Furthermore, a sliding opening for the push rod 8 is provided inside the static iron core 11, and the push rod 8 is slidably installed in the sliding opening. The two ends of the push rod 8 are respectively restricted by the control piston 3 and the moving iron core 7. The movement of either the control piston 3 or the moving iron core 7 will push the other to move. Specifically, the two ends of the push rod 8 can be fixed to the control piston 3 and the moving iron core 7 respectively, or only the two ends of the push rod 8 can be in contact with the control piston 3 and the moving iron core 7 respectively (the elastic force of the elastic reset member 6 will keep the push rod 8 in a state of being clamped by the control piston 3 and the moving iron core 7 at all times). The cross-section of the push rod 8 is smaller than the cross-section of the sliding mouth. Therefore, a gap is formed between the push rod 8 and the static iron core 11, and at least one balancing hole 13 is provided at the end of the control piston 3. The oil entering between the static iron core 11 and the control piston 3 from the balancing hole 13 can enter the space between the static iron core 11 and the moving iron core 7 through the gap between the push rod 8 and the static iron core 11.

[0056] The working principle of this two-position three-way solenoid valve:

[0057] like Figure 2 As shown, when the coil 14 is not energized, the A1 port is open, the A2 port is closed, and there is a certain space between the moving iron core 7 and the static iron core 11.

[0058] When the coil 14 is energized, the coil 14, the static iron core 11, and the movable iron core 7 form an electromagnet. The static iron core 11 generates an attractive force on the movable iron core 7, causing the movable iron core 7 to move upward. The upward movement of the movable iron core 7 is divided into three stages:

[0059] Phase 1: When the current flowing through the coil 14 is small, the moving iron core 7 moves upward a small distance and moves toward the static iron core 11, pushing the push rod 8. The push rod 8 pushes the control piston 3 upward, causing the guide port A40 to partially overlap with the oil outlet A20, and the guide port B41 to partially overlap with the oil outlet B21. At this time, ports A1 and A2 are connected, and the flow rates of ports A1 and A2 can be distributed according to the force ratio at both ends of the control piston 3.

[0060] Stage 2: When the current flowing through the coil 14 continues to increase, the moving iron core 7 moves upward a large distance and moves toward the static iron core 11, pushing the push rod 8. The push rod 8 pushes the control piston 3 upward, causing the guide port A40 and the oil outlet A20 to completely not overlap, and the guide port B41 and the oil outlet B21 to completely overlap. At this time, port A1 is closed and port A2 is connected.

[0061] Stage 3: When the current flowing through the coil 14 continues to increase, the upward movement distance of the moving iron core 7 increases again, and the moving iron core 7 moves toward the static iron core 11, pushing the push rod 8. The push rod 8 pushes the control piston 3 upward, causing the guide port A40 and the oil outlet A20 to completely not overlap, and the guide port B41 and the oil outlet B21 to completely not overlap. At this time, port A1 is closed and port A2 is closed.

[0062] When the coil 14 is de-energized, the coil 14, the static iron core 11, and the moving iron core 7 no longer form an electromagnet. The suction force of the static iron core 11 on the moving iron core 7 disappears, and the control piston 3 moves downward under the action of the elastic reset member 6 to complete the reset. The A1 port opens and the A2 port closes. At the same time, the control piston 3 pushes the push rod 8 to move downward, and the moving iron core 7 is pushed downward by the push rod 8 to reset.

[0063] Example 2

[0064] The difference between this embodiment and the first embodiment is that the oil inlet 16 is set at a different position. In this embodiment, the oil inlet 16 is set at the middle of the control piston 3. Figure 4 and Figure 5 .

[0065] Reference Figure 4 and Figure 5 The upper end of the valve body 1 is a long-through port or blocked state. The hydraulic oil enters from the oil outlet 2 in the middle of the control piston 3 and flows out from the A1 port or A2 port. The specific instructions are as follows:

[0066] Reference Figure 4 When the solenoid valve is de-energized, the control piston 4 is pressed downward by the elastic reset member 6, thereby closing port A2. Simultaneously, port A1 at the top of the diagram is opened. This means that the liquid inlet 16 is connected to A1, while the liquid inlet 16 to A2 is closed.

[0067] Reference Figure 5 When the solenoid valve is energized, coil 14 generates electromagnetic force, causing movable iron core 8 to move upward as shown. This, through push rod 8, pushes control piston 3 upward as shown, compressing elastic return element 6, thereby opening port A2 and closing port A1. This means that inlet 16 is connected to A2, while inlet 16 is closed to A1.

[0068] It should be noted that the proportional movement of the control piston can be adjusted by controlling the amount of current flowing through coil 14, thereby distributing the high-pressure oil in the piston bore proportionally between ports A1 and A2. This means that as the flow at port A1 increases, the flow at port A2 decreases; or vice versa.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A two-position three-way solenoid valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with an oil inlet (16) and two oil outlets (2), and the two oil outlets (2) are arranged vertically on the valve body (1); A control piston (3) is provided in the valve body (1) and can slide up and down along the inner wall of the valve body (1); a guide port (4) corresponding to the oil outlet (2) is provided on the control piston (3); The control piston (3) is directly or indirectly controlled by a moving iron core (7) arranged below the control piston (3).

2. The two-position three-way solenoid valve according to claim 1, characterized in that: The oil inlet (16) is arranged at the upper end of the valve body (1) or the middle of the control piston (3).

3. The two-position three-way solenoid valve according to claim 1, characterized in that: The control piston (3) is a bottom-sealed sinking trough structure, and the guide port (4) is arranged on the side wall of the control piston (3) and is in communication with the interior of the control piston (3).

4. The two-position three-way solenoid valve according to claim 1, characterized in that: A pressure ring (5) is installed on the top of the inner wall of the valve body (1), and an elastic reset member (6) is connected between the pressure ring (5) and the control piston (3).

5. The two-position three-way solenoid valve according to claim 4, characterized in that: The elastic reset member (6) is a reset spring.

6. The two-position three-way solenoid valve according to claim 5, characterized in that: The distance between the two guide ports (4) is equal to the distance between the two oil outlets (2) plus the opening height of the oil outlet (2).

7. The two-position three-way solenoid valve according to claim 4, characterized in that: An end of the valve body (1) away from the pressure ring (5) is provided with a shell (9) and an end cover (10), and the end cover (10) is connected to the shell (9).

8. The two-position three-way solenoid valve according to claim 7, characterized in that: The moving iron core (7) is arranged in the housing (9), and a coil (14) and a static iron core (11) are also arranged in the housing (9), and the static iron core (11) and the moving iron core (7) are both arranged in the coil (14); The control piston (3) and the moving iron core (7) are connected via a push rod (8), and the push rod (8) slides up and down in the static iron core (11).

9. The two-position three-way solenoid valve according to claim 8, characterized in that: A magnetic isolation sleeve (12) is provided below the static iron core (11), and the movable iron core (7) slides in the magnetic isolation sleeve (12).

10. The two-position three-way solenoid valve according to claim 8, characterized in that: At least one balancing hole (13) is provided at the end of the control piston (3).

Images