Bidirectional sealing electromagnetic valve for braking system

Abstract

The invention provides a two-way sealing electromagnetic valve for a braking system, which comprises a valve body assembly, the periphery of the valve body assembly is sleeved with a coil, the valve body assembly is internally provided with a first space, the first space is internally provided with a limiting structure and a limiting separation blade, and the first space is provided with a first oil port and a second oil port; a switch mechanism is further arranged and comprises a valve element assembly, a first valve seat and a second valve seat, a first elastic piece is arranged between the valve element assembly and the valve body assembly, a second elastic piece is arranged between the second valve seat and the first valve seat, the first valve seat is provided with a first valve port, and the second valve seat is provided with a second valve port and is in sliding sealing with the valve body assembly. The area of the second valve port is larger than that of the first valve port; by arranging the valve element assembly elastically connected with the valve body assembly, the first valve seat and the second valve seat elastically connected with the first valve seat, the valve element assembly, the first valve seat and the second valve seat can move in the first space under the interaction of electromagnetic force, elastic force and liquid pressure and are matched with one another to achieve opening of the electromagnetic valve and two-way sealing when the pressures of the two oil ports are different.

Description

Technical Field

[0001] The present application relates to the technical field of solenoid valves, and in particular to a bidirectional sealing solenoid valve for a braking system. Background Art

[0002] At present, with the continuous development of automobile intelligence and electrification technology, not only passenger cars are gradually becoming intelligent, but also the braking systems on small commercial vehicles are gradually becoming electronic and intelligent. Auto parts are also developing towards lightweight, integration and intelligence. At present, the existing pressure control solenoid valves are mainly divided into normally open, normally closed and pilot type solenoid valves, but the above existing solenoid valves cannot form a seal under different working conditions with a two-way pressure difference, that is, they cannot form a two-way seal. Summary of the invention

[0003] The purpose of this application is to solve the above problems and provide a bidirectional sealing solenoid valve for a brake system, comprising: A valve body assembly, wherein a coil is sleeved on the outer periphery of the valve body assembly, a first space is formed inside the valve body assembly, a limit structure and a limit baffle are provided in the first space, and a first oil port and a second oil port communicating with the first space are opened on the valve body assembly; A switch mechanism, the switch mechanism is arranged in the first space, comprising: A valve core assembly, wherein a first elastic member is disposed between the valve core assembly and the valve body assembly, and the valve core assembly can move along a first direction under the elastic force of the first elastic member and the magnetic field force of the coil; A first valve seat, wherein the first valve seat is disposed on a side of the valve core assembly close to the second oil port, and has a first valve port at one end of the first valve seat close to the valve core assembly; A second valve seat, wherein the second valve seat is arranged on a side of the first valve seat close to the second oil port, and a second elastic member is arranged between the second valve seat and the first valve seat, the second valve seat and the valve body assembly can be slidably sealed, and one end of the second valve seat close to the first valve seat has a second valve port, and the area of ​​the second valve port is larger than that of the first valve port; The switch mechanism has a first state, a second state, and a third state; When in the first state, the valve core assembly is separated from the first valve port, the first valve seat is separated from the second valve port, the first valve seat abuts against the limiting structure, the second valve seat abuts against the limiting baffle, and the first valve port and the second valve port are open; When in the second state, the valve core assembly closes the first valve port, the first valve seat closes the second valve port, and the first valve seat abuts against the limiting structure; When in the third state, the valve core assembly closes the first valve port, the first valve seat closes the second valve port, and the second valve seat abuts against the limit stopper; The bidirectional sealing solenoid valve has a fourth state and a fifth state. When in the fourth state, the first oil port is connected to the second oil port; when in the fifth state, the first oil port is isolated from the second oil port. When the switch mechanism is in the first state and the bidirectional sealing solenoid valve is in the fourth state, the switch mechanism can be switched to the third state under the elastic force of the first elastic member and the magnetic field force of the coil, and then maintain the third state or switch to the second state under the pressure difference between the first oil port and the second oil port, so that the bidirectional sealing solenoid valve is switched from the fourth state to the fifth state; When the switch mechanism is in the second state and the two-way sealing solenoid valve is in the fifth state, the valve core assembly can move away from the second oil port under the elastic force of the first elastic member and the magnetic field force of the coil, and then the second valve seat can move toward the second oil port under the elastic force of the second elastic member until it abuts against the limit stopper, the switch mechanism switches from the second state to the first state, and the two-way sealing solenoid valve switches from the fifth state to the fourth state; When the switching mechanism is in the third state and the bidirectional sealing solenoid valve is in the fifth state, the valve core assembly can move away from the second oil port under the action of the elastic force of the first elastic member and the magnetic field force of the coil, and then the first valve seat can move away from the second oil port under the action of the elastic force of the second elastic member until it abuts against the limiting structure, and the switching mechanism switches from the third state to the first state, and the bidirectional sealing solenoid valve switches from the fifth state to the fourth state.

[0004] According to the technical solution provided in certain embodiments of the present application, the minimum flow area between the second valve port and the second oil port is the first flow area, and the sum of the areas of the plurality of first oil ports is smaller than the first flow area.

[0005] According to the technical solutions provided in some embodiments of the present application, the valve body assembly includes a first base, a second base is sleeved on the outer periphery of the first base, and also includes a magnetic isolation tube, one end of the magnetic isolation tube is fixed to the second base, and the other end is fixed with a static iron, the first base, the second base and the magnetic isolation tube are internally connected to form the first space, a plurality of the first oil ports are opened on the side wall of the first base, the inner wall of the end close to the static iron forms the limiting structure, the end away from the static iron is fixed with the limiting baffle, the end of the second base away from the static iron is opened with the second oil port, and a connecting port is also opened on the side wall corresponding to the first oil port, the first valve seat and the second valve seat are arranged in the first base, and the end of the first valve seat close to the first valve port can pass through the limiting structure and extend out of the first base; the valve core assembly includes a moving iron and a steel ball, the moving iron is arranged in the magnetic isolation tube, the first elastic member is arranged between the moving iron and the static iron, and the steel ball is arranged at the end of the moving iron away from the static iron for closing the first valve port.

[0006] According to the technical solution provided in certain embodiments of the present application, the valve body assembly includes a valve body, one end of the valve body is sleeved and fixed with a magnetic isolation tube, the valve body is connected to the inside of the magnetic isolation tube to form the first space, a plurality of the first oil ports are opened on the side wall of the valve body, and the second oil port is opened at the end away from the magnetic isolation tube, the inner wall of the valve body forms the limiting structure, the limiting baffle is fixed inside the valve body between the limiting structure and the second oil port, and the side of the limiting baffle close to the limiting structure abuts against the valve body; the first valve seat and the second valve seat are arranged between the limiting structure and the limiting baffle, and the end of the first valve seat close to the first valve port can pass through the limiting structure; the valve core assembly includes a moving iron and a valve core column, the moving iron is arranged in the magnetic isolation tube, the valve core column is arranged at the end of the moving iron close to the first valve seat, for closing the first valve port, and the first elastic member is arranged between the valve core column and the limiting structure.

[0007] According to the technical solution provided in certain embodiments of the present application, the first valve seat has a plurality of first protrusions on a side close to the limiting structure, a first oil channel is formed between two adjacent first protrusions, and the plurality of first protrusions can simultaneously abut against the limiting structure to limit the movement of the first valve seat away from the second oil port; the second valve seat has a plurality of second protrusions on a side close to the limiting baffle plate, a second oil channel is formed between two adjacent second protrusions, and the plurality of second protrusions can simultaneously abut against the limiting baffle plate to limit the movement of the second valve seat toward the second oil port.

[0008] According to the technical solution provided in certain embodiments of the present application, a first channel is provided inside the first valve seat, the axis of the first channel extends along the first direction, and one end is connected to the first valve port, the first channel includes a first sealing cavity, a first guide cavity and a first installation cavity which are connected in sequence, the inner contour of the first sealing cavity matches the outer contour of the valve core assembly close to one end of the first valve seat, the inner diameter of the first guide cavity gradually increases from the side close to the first valve port to the side away from the first valve port, and the first installation cavity is used to set the second elastic member.

[0009] According to the technical solutions provided in certain embodiments of the present application, a second channel is provided inside the second valve seat, the axis of the second channel extends along the first direction, and one end is connected to the second valve port, the second channel includes a second sealing cavity, a second guide cavity, a second installation cavity and a third guide cavity which are connected in sequence, the inner contour of the second sealing cavity matches the outer contour of the first valve seat at one end close to the second valve seat, the inner diameter of the second guide cavity gradually decreases from the side close to the second valve port to the side away from the second valve port, the inner diameter of the third guide cavity first decreases and then increases, and the second installation cavity is also used to set the second elastic member.

[0010] According to the technical solution provided in certain embodiments of the present application, a third channel is provided inside the limit baffle, the axis of the third channel extends along the first direction, and includes a first flow cavity and a second flow cavity connected in sequence, and the inner diameter of the first flow cavity is smaller than the inner diameter of the second flow cavity.

[0011] According to the technical solution provided in certain embodiments of the present application, the distance between one end of the steel ball close to the first valve seat and the first valve port along the first direction is recorded as the first distance, and when the switching mechanism switches from the first state to the second state, the distance moved by the moving iron is equal to the sum of the distance moved by the first valve seat and the first distance.

[0012] According to the technical solution provided in certain embodiments of the present application, the distance between one end of the valve core column close to the first valve seat and the first valve port along the first direction is recorded as the second distance, and when the switching mechanism switches from the first state to the second state, the distance between the moving iron and the valve body along the first direction is greater than the sum of the distance moved by the first valve seat and the second distance.

[0013] Compared with the prior art, the beneficial effects of the present application are as follows: the present application provides a bidirectional sealed solenoid valve for a braking system, including a valve body assembly, a coil is sleeved on the outer periphery of the valve body assembly, a first space is provided inside the valve body assembly, a limit structure and a limit baffle are provided in the first space, a first oil port and a second oil port connected to the first space are opened on the valve body assembly; a switch mechanism is also provided, which includes a valve core assembly, a first valve seat and a second valve seat, the valve core assembly and the valve body assembly are provided with a first elastic member, the first valve seat has a first valve port, the second valve seat and the first valve seat are provided with a second elastic member, the second valve seat has a second valve port, and the second valve seat and the valve body assembly can slide to seal the second valve port The area is larger than the area of ​​the first valve port; the switch mechanism has three states. In the first state, the valve core assembly and the first valve port are separated, the first valve seat and the second valve port are separated, the first valve seat abuts on the limiting structure, the second valve seat abuts on the limiting baffle, the first valve port and the second valve port are opened, and the first oil port is connected to the second oil port; in the second state, the valve core assembly closes the first valve port, the first valve seat closes the second valve port, the first valve seat abuts on the limiting structure, and the first oil port is separated from the second oil port; in the third state, the valve core assembly closes the first valve port, the first valve seat closes the second valve port, the first valve seat abuts on the limiting baffle, and the first oil port is separated from the second oil port.

[0014] By arranging a valve core assembly elastically connected to the valve body assembly, a first valve seat and a second valve seat elastically connected to the first valve seat in the valve body assembly, the three can move along the first direction in the first space under the interaction of electromagnetic force, elastic force and hydraulic force, and through mutual cooperation, the opening of the solenoid valve and the two-way sealing when the pressures of the first oil port and the second oil port are different can be achieved.

[0015] By opening a second valve port with a large flow area, the solenoid valve can have a larger flow capacity when opened, and more brake fluid can pass through in a short time. Compared with the first valve port with a smaller area than the second valve port, when there is a pressure difference between the first oil port and the second oil port, the valve core component needs to overcome smaller liquid pressure when moving to open the first valve port or keeping the first valve port closed, thereby further improving the stability of the solenoid valve's two-way seal.

[0016] It should be understood that the description of technical features, technical solutions, beneficial effects or similar language in this application does not imply that all features and advantages can be realized in any single embodiment. On the contrary, it is understood that the description of features or beneficial effects means that specific technical features, technical solutions or beneficial effects are included in at least one embodiment. Therefore, the description of technical features, technical solutions or beneficial effects in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in the present embodiment can also be combined in any appropriate manner. Those skilled in the art will understand that the embodiment can be realized without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can also be identified in a specific embodiment that does not embody all embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic cross-sectional view of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application having a normally closed function; Figure 2 A cross-sectional schematic diagram of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application having a normally open function; Figure 3 A schematic cross-sectional view of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application having a normally closed function and in a first state; Figure 4 A cross-sectional schematic diagram of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application having a normally closed function and in a second state; Figure 5 A cross-sectional schematic diagram of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application having a normally closed function and in a third state; Figure 6 A cross-sectional schematic diagram of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application having a normally open function and in a first state; Figure 7 A cross-sectional schematic diagram of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application having a normally open function and in a second state; Figure 8A cross-sectional schematic diagram of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application having a normally open function and in a third state; Fig. 9 A schematic diagram of the structure of a first valve seat of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application; Fig.10 A schematic cross-sectional view of a first valve seat of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application; Fig.11 A schematic diagram of the structure of a second valve seat of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application; Fig.12 A schematic cross-sectional view of a second valve seat of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application; Fig.13 A schematic structural diagram of a first base of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application; Fig.14 A schematic cross-sectional view of a first base of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application; Fig.15 A schematic cross-sectional view of a valve body of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application; Fig.16 A schematic cross-sectional view of a limit stopper of a bidirectional sealing solenoid valve for a brake system provided in an embodiment of the present application; Fig.17 for Figure 5 Enlarged view of part A.

[0019] The text annotations in the figure represent: 1. Valve core assembly; 2. Moving iron; 3. First valve seat; 4. Second valve seat; 5. First oil port; 6. Second oil port; 7. Limiting structure; 8. Limiting baffle; 9. First elastic member; 10. Second elastic member; 11. Third oil port; 12. Magnetic isolation tube; 13. First base; 14. Second base; 15. Stationary iron; 16. Steel ball; 17. Valve body; 18. Valve core column; 19. Coil; 20. Power pin; 20. Sealing ring; 21. Connecting port ; 31. first valve port; 32. first raised portion; 33. first sealing cavity; 34. first flow guide cavity; 35. first mounting cavity; 36. closing portion; 37. first oil passage; 41. second valve port; 42. second raised portion; 43. second sealing cavity; 44. second flow guide cavity; 45. second mounting cavity; 46. third flow guide cavity; 47. second oil passage; 81. first circulation cavity; 82. second circulation cavity; 131. matching portion; 132. flow passing portion. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present application. Specifically, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] As mentioned in the background technology, in order to solve the problems existing in the prior art, this embodiment provides a bidirectional sealing solenoid valve for a brake system, comprising: A valve body assembly, wherein a coil 19 is sleeved on the outer periphery of the valve body assembly, and a first space is provided inside the valve body assembly, a limiting structure 7 and a limiting baffle 8 are provided in the first space, and a first oil port 5 and a second oil port 6 communicating with the first space are provided on the valve body assembly; The switch mechanism is arranged in the first space and includes: A valve core assembly 1, wherein a first elastic member 9 is disposed between the valve core assembly 1 and the valve body assembly, and the valve core assembly 1 can move along a first direction under the elastic force of the first elastic member and the magnetic field force of the coil 19; A first valve seat 3, the first valve seat 3 is arranged on one side of the valve core assembly 1 close to the second oil port 6, and has a first valve port 31 at one end thereof close to the valve core assembly 1; The second valve seat 4 is arranged on the side of the first valve seat 3 close to the second oil port 6, and a second elastic member is provided between the first valve seat 3. The second valve seat 4 and the valve body assembly can be slidably sealed, and the end close to the first valve seat 3 has a second valve port 41, and the area of ​​the second valve port 41 is larger than the area of ​​the first valve port 31.

[0023] The first direction is the length extension direction of the solenoid valve. The first elastic member 9 and the second elastic member 10 both adopt springs in the prior art. At the same time, the electromagnetic force applied by the magnetic field force of the coil 19 to the valve core assembly 1 is greater than the elastic force of the first elastic member 9 and greater than the elastic force of the second elastic member 10.

[0024] In a preferred embodiment, the valve body assembly includes a first base 13, a second base 14 is sleeved on the outer periphery of the first base 13, and also includes a magnetic isolation tube 12, one end of the magnetic isolation tube 12 is fixed to the second base 14, and the other end is fixed with a static iron 15, the first base 13, the second base 14 and the magnetic isolation tube 12 are connected to form a first space, a plurality of first oil ports 5 are opened on the side wall of the first base 13, a limiting structure 7 is formed on the inner wall of the end close to the static iron 15, and a limiting baffle 8 is fixed inside the end away from the static iron 15, and the second base 1 The end away from the static iron 15 is provided with a second oil port 6, and the side wall thereof is provided with a communication port 21 at a position corresponding to the first oil port 5. The first valve seat 3 and the second valve seat 4 are arranged in the first base 13, and the end of the first valve seat 3 close to the first valve port 31 can penetrate the limiting structure 7 and extend out of the first base 13; the valve core assembly 1 includes a moving iron 2 and a steel ball 16. The moving iron 2 is arranged in the magnetic isolation tube 12, and a first elastic member 9 is arranged between the moving iron 2 and the static iron 15. The steel ball 16 is arranged at the end of the moving iron 2 away from the static iron 15, and is used to close the first valve port 31.

[0025] like Figure 1 As shown, a bidirectional sealed solenoid valve with a normally closed function provided in this embodiment, the first base 13, the second base 14 and the magnetic isolation tube 12 are all hollow structures, the first base 13 has a matching portion 131 and a flow portion 132 at both ends along the first direction, and a limit baffle 8 is provided inside the end close to the matching portion 131, and a limit structure 7 is formed on the inner wall of the end close to the flow portion 132. The limit structure 7 is approximately annular and has a through hole in the center; the second base 14 is sleeved on the first base 13, and its inner wall The mating part 131 is relatively fixed with each other through interference fit, and a current gap is formed between the magnetic isolation tube 12 and the current passing part 132; the magnetic isolation tube 12 extends along the first direction and has openings at both ends, one end of the opening is sleeved on one end of the second base 14 close to the current passing part 132, and is also relatively fixed to the second base 14 through interference fit, and the other end of the opening is closed and provided with a static iron 15; the coil 19 is sleeved on the outer periphery of the magnetic isolation tube 12, and is electrically connected to the controller through the power pin 20, so that the power can be turned on / off under the control of the controller.

[0026] When the coil 19 is energized, the moving iron 2 compresses the first elastic member 9 under the action of the magnetic field force of the coil 19 and moves toward the side close to the stationary iron 15. When the coil 19 is de-energized, the moving iron 2 moves toward the side away from the stationary iron 15 under the action of the elastic force of the first elastic member 9. The first valve seat 3 and the second valve seat 4 are arranged in the first base 13. The first valve port 31 end of the first valve seat 3 can extend out of the first base 13 from the through hole, and the end away from the moving iron 2 has a closing portion 36. The outer periphery of the second valve seat 4 is provided with a sealing ring 20, so that the second valve seat 4 and the inner wall of the first base 13 can be slidably sealed.

[0027] In a preferred embodiment, the valve body assembly includes a valve body 17, one end of the valve body 17 is sleeved and fixed with a magnetic isolation tube 12, the valve body 17 is connected to the inside of the magnetic isolation tube 12 to form a first space, a plurality of first oil ports 5 are opened on the side wall of the valve body 17, and a second oil port 6 is opened at the end away from the magnetic isolation tube 12, a limiting structure 7 is formed on the inner wall of the valve body 17, and a limiting baffle 8 is fixed inside the limiting structure 7 and the second oil port 6, and the side of the limiting baffle 8 close to the limiting structure 7 abuts against the valve body 17; the first valve seat 3 and the second valve seat 4 are arranged between the limiting structure 7 and the limiting baffle 8, and the end of the first valve seat 3 close to the first valve port 31 can pass through the limiting structure 7; the valve core assembly 1 includes a moving iron 2 and a valve core column 18, the moving iron 2 is arranged in the magnetic isolation tube 12, the valve core column 18 is arranged at the end of the moving iron 2 close to the first valve seat 3, for closing the first valve port 31, and a first elastic member 9 is provided between the valve core column 18 and the limiting structure 7.

[0028] like Figure 2 As shown, a bidirectional sealed solenoid valve with a normally open function is provided in this embodiment. The valve body 17 and the magnetic isolation tube 12 are both hollow structures. The magnetic isolation tube 12 is an open structure at one end, and its open end is sleeved on the end of the valve body away from the second oil port 6. It is relatively fixed to the valve body 17 by an interference fit. The limiting structure 7 is approximately annular and has a through hole in the center. The coil 19 is sleeved on the outer periphery of the magnetic isolation tube 12 and is electrically connected to the controller through the power pin 20, so that power on / off can be achieved under the control of the controller.

[0029] When the coil 19 is energized, the moving iron 2 compresses the first elastic member 9 under the action of the magnetic field force of the coil 19 and moves toward the side close to the valve body 17. When the coil 19 is de-energized, the moving iron 2 moves toward the side away from the valve body 17 under the action of the elastic force of the first elastic member 9. The first valve seat 3 and the second valve seat 4 are arranged in the valve body 17, between the limiting structure 7 and the limiting baffle 8. The first valve port 31 end of the first valve seat 3 can extend from the through hole to the side of the limiting structure 7 away from the limiting baffle 8, and the end away from the moving iron 2 has a closing portion 36. The outer periphery of the second valve seat 4 is provided with a sealing ring 20, so that the second valve seat 4 and the valve body 17 can be slidably sealed.

[0030] In a preferred embodiment, the switch mechanism has a first state, a second state, and a third state; When in the first state, the valve core assembly 1 is separated from the first valve port 31, the first valve seat 3 is separated from the second valve port 41, the first valve seat 3 abuts against the limiting structure 7, the second valve seat 4 abuts against the limiting baffle 8, and the first valve port 31 and the second valve port 41 are opened; When in the second state, the valve core assembly 1 closes the first valve port 31, the first valve seat 3 closes the second valve port 41, and the first valve seat 3 abuts against the limiting structure 7; When in the third state, the valve core assembly 1 closes the first valve port 31, the first valve seat 3 closes the second valve port 41, and the second valve seat 4 abuts against the limit stopper 8; The bidirectional sealing solenoid valve has a fourth state and a fifth state. When in the fourth state, the first oil port 5 is connected to the second oil port 6; when in the fifth state, the first oil port 5 is isolated from the second oil port 6. When the switch mechanism is in the first state and the two-way sealing solenoid valve is in the fourth state, the switch mechanism can be switched to the third state under the elastic force of the first elastic member 9, and then maintain the third state or switch to the second state under the pressure difference between the first oil port 5 and the second oil port 6, so that the two-way sealing solenoid valve is switched from the fourth state to the fifth state; When the switch mechanism is in the second state and the two-way sealing solenoid valve is in the fifth state, the valve core assembly 1 can move away from the second oil port 6 under the action of the magnetic field force of the coil 19, and then the second valve seat 4 can move toward the second oil port 6 under the elastic force of the second elastic member 10 until it abuts against the limit stopper 8, and the switch mechanism switches from the second state to the first state, and the two-way sealing solenoid valve switches from the fifth state to the fourth state; When the switching mechanism is in the third state and the two-way sealing solenoid valve is in the fifth state, the valve core assembly 1 can move toward the side away from the second oil port 6 under the action of the magnetic field force of the coil 19, and then the first valve seat 3 can move toward the side away from the second oil port 6 under the action of the elastic force of the second elastic member 9 until it abuts against the limiting structure 7. The switching mechanism switches from the third state to the first state, and the two-way sealing solenoid valve switches from the fifth state to the fourth state.

[0031] like Figure 3 As shown, in a bidirectional sealed solenoid valve with a normally closed function, initially, the coil 19 is energized to generate a magnetic field, the moving iron 2 is acted upon by an electromagnetic force and the electromagnetic force is greater than the elastic force of the first elastic member 9, the moving iron 2 is located on the side of the magnetic isolation tube 12 close to the stationary iron 15, the first valve seat 3 and the second valve seat 4 are respectively abutted against the limiting structure 7 and the limiting baffle 8 under the elastic force of the second elastic member 10, the steel ball 16 is separated from the first valve port 31, the first valve port 31 is opened, the closing portion 36 is separated from the second valve port 41, the second valve port 41 is opened, which is the above-mentioned first state, at this time, the first oil port 5 and the second oil port 6 are connected, and the bidirectional sealed solenoid valve is in the above-mentioned fourth state.

[0032] like Figure 4 As shown, when the coil 19 is de-energized, the electromagnetic force is 0, and the moving iron 2 moves toward the side close to the first valve seat 3 under the elastic force of the first elastic member 9, and the steel ball 16 abuts against the first valve seat 3 and closes the first valve port 31. Since the elastic force of the first elastic member 9 is greater than the elastic force of the second elastic member 10, the first valve seat 3 compresses the second elastic member 10 and abuts against the second valve seat 4 under the push of the moving iron 2, and the closing portion 36 closes the second valve port 41, which is the third state mentioned above. At this time, the first oil port 5 and the second oil port 6 are separated, and the two-way sealing solenoid valve is in the fifth state mentioned above.

[0033] If the liquid flows from the first oil port 5 to the second oil port 6, the pressure at the first oil port 5 gradually increases, and the switch mechanism is subjected to the liquid pressure in the direction toward the second oil port 6. Under the action of the liquid pressure, the moving iron 2 and the first valve seat 3 make the sealing at the first valve port 31 and the second valve port 41 more stable. At this time, the liquid pressure on the first valve seat 3 is:

[0034] Among them, F b is the liquid pressure on the first valve seat 3, S 2 is the sealing area of ​​the second valve port 41, d 2 is the sealing area diameter of the second valve port 41 .

[0035] When the coil 19 is energized again to generate a magnetic field, the moving iron 2 is now subjected to the electromagnetic force directed toward the side of the stationary iron 15, the liquid pressure directed toward the side of the second oil port 6, and the elastic force of the first elastic member 9. The liquid pressure on the moving iron 2 is:

[0036] Among them, F a is the liquid pressure on the moving iron 2, ΔP 12 is the pressure difference between the first oil port 5 and the second oil port 6, S 1 is the sealing area of ​​the first valve port 31, d 1is the sealing area diameter of the first valve port 31; since the sealing area of ​​the first valve port 31 is small, the liquid pressure exerted on the moving iron 2 when there is a pressure difference between the two oil ports is also smaller, so that the electromagnetic force exerted on the moving iron 2 is greater than the sum of the liquid pressure exerted on it and the elastic force of the first elastic member 9, the moving iron 2 can be moved along the first direction toward the side of the static iron 15, the steel ball 16 is separated from the first valve port 31, and the first valve port 31 is opened; as the liquid flows from the first valve port 31 to the side of the first valve seat 3 close to the second oil port 6, the liquid pressure exerted on the first valve seat 3 gradually decreases. When the liquid pressure exerted on the first valve seat 3 is less than the elastic force of the second elastic member 10, it moves toward the side of the static iron 15 under the elastic force of the second elastic member 10 until it abuts against the limiting structure 7, and its closing portion 36 is separated from the second valve port 41, the second valve port 41 is opened, the first oil port 5 and the second oil port 6 are connected, and at this time the switch mechanism is switched to the first state again, and the two-way sealing solenoid valve is switched to the fourth state.

[0037] like Figure 5 As shown, when the switch mechanism is in the third state and the two-way sealed solenoid valve is in the fifth state, if the liquid flows from the second oil port 6 to the first oil port 5, the pressure at the first oil port 6 gradually increases, and the switch mechanism is subjected to the liquid pressure in the direction toward the side of the static iron 15, and the liquid pressure on the second valve seat 4 is:

[0038] Among them, F c is the liquid pressure on the second valve seat 4, ΔP 21 is the pressure difference between the second oil port 6 and the first oil port 5, S 3 is the sealing area of ​​the sealing ring 20 of the second valve seat 4, d 3 is the sealing area diameter of the sealing ring 20 of the second valve seat 4. Since the sealing area of ​​the sealing ring 20 of the second valve seat 4 is the largest, the liquid pressure applied to the second valve seat 4 is the largest, which is greater than the sum of the elastic forces of the first elastic member 9 and the second elastic member 10. Under the action of the liquid pressure, the second valve seat 4 pushes the first valve seat 3 and the moving iron 2 to move together to the side away from the second oil port 6 until the first valve seat 3 abuts against the limiting structure 7. During this process, the liquid pressure applied to the moving iron 2 is only related to the sealing area of ​​the first valve port 31. It is only necessary to ensure that the elastic force of the first elastic member 9 applied to the moving iron 2 is greater than the liquid pressure applied to it. The first valve port 31 and the second valve port 41 are always kept closed, and the switch mechanism is switched to the second state. Since the first oil port 5 and the second oil port 6 are always in a cut-off state, the two-way sealing solenoid valve maintains the fifth state.

[0039] When the coil 19 is energized again to generate a magnetic field, the moving iron 2 is now subjected to the electromagnetic force and liquid pressure in the direction toward the side of the stationary iron 15 and the elastic force of the first elastic member 9 in the direction toward the side of the second oil port 6. Since the electromagnetic force on the moving iron 2 is greater than the elastic force of the first elastic member 9, the moving iron 2 moves toward the side of the stationary iron 15, the steel ball 16 is separated from the first valve port 31, and the first valve port 31 is opened. As the liquid flows from the first valve port 31 to the side of the sealing ring 20 of the second valve seat 4 away from the second oil port 6, the liquid pressure on the second valve seat 4 gradually decreases. When the liquid pressure on the second valve seat 4 is less than the elastic force of the second elastic member 10, it moves toward the side of the second oil port 6 under the elastic force of the second elastic member 10 until it abuts against the limit baffle 8, the closing portion 36 is separated from the second valve port 41, the second valve port 41 is opened, the first oil port 5 and the second oil port 6 are connected, and the switch mechanism is switched to the first state again, and the two-way sealing solenoid valve is switched to the fourth state.

[0040] In a preferred embodiment, the switch mechanism has a first state, a second state, and a third state; When in the first state, the valve core assembly 1 is separated from the first valve port 31, the first valve seat 3 is separated from the second valve port 41, the first valve seat 3 abuts against the limiting structure 7, the second valve seat 4 abuts against the limiting baffle 8, and the first valve port 31 and the second valve port 41 are opened; When in the second state, the valve core assembly 1 closes the first valve port 31, the first valve seat 3 closes the second valve port 41, and the first valve seat 3 abuts against the limiting structure 7; When in the third state, the valve core assembly 1 closes the first valve port 31, the first valve seat 3 closes the second valve port 41, and the second valve seat 4 abuts against the limit stopper 8; The bidirectional sealing solenoid valve has a fourth state and a fifth state. When in the fourth state, the first oil port 5 is connected to the second oil port 6; when in the fifth state, the first oil port 5 is isolated from the second oil port 6. When the switch mechanism is in the second state and the two-way sealing solenoid valve is in the fifth state, the valve core assembly 1 can move away from the second oil port 6 under the elastic force of the first elastic member 9, and then the second valve seat 4 can move toward the second oil port 6 under the elastic force of the second elastic member 10, the switch mechanism switches from the second state to the first state, and the two-way sealing solenoid valve switches from the fifth state to the fourth state; When the switch mechanism is in the third state and the two-way sealing solenoid valve is in the fifth state, the valve core assembly 1 can move to the side away from the second oil port 6 under the elastic force of the first elastic member 9, and then the first valve seat 3 can move to the side away from the second oil port 6 under the elastic force of the second elastic member 9, the switch mechanism switches from the third state to the first state, and the two-way sealing solenoid valve switches from the fifth state to the fourth state; When the switching mechanism is in the first state and the bidirectional sealing solenoid valve is in the fourth state, the switching mechanism can be switched to the third state under the action of the magnetic field force of the coil 19, and then maintain the third state or switch to the second state under the action of the pressure difference between the first oil port 5 and the second oil port 6, so that the bidirectional sealing solenoid valve is switched from the fourth state to the fifth state.

[0041] like Figure 6 As shown, in the bidirectional sealed solenoid valve with normally open function, initially, the coil 19 is de-energized, and the moving iron 2 is located on the side of the magnetic isolation tube 12 away from the first valve seat 3 under the elastic force of the first elastic member 9, and the first valve seat 3 and the second valve seat 4 are respectively abutted against the limiting structure 7 and the limiting baffle 8 under the elastic force of the second elastic member 10, the valve core column 18 is separated from the first valve port 31, and the first valve port 31 is opened, the closing portion 36 is separated from the second valve port 41, and the second valve port 41 is opened, which is the above-mentioned first state. At this time, the first oil port 5 and the second oil port 6 are connected, and the bidirectional sealed solenoid valve is in the above-mentioned fourth state.

[0042] like Figure 7 As shown, when the coil 19 is energized, the moving iron 2 compresses the first elastic member 9 and moves toward the side close to the valve body 17 under the action of the magnetic field force of the coil 19, and the valve core column 18 abuts against the first valve seat 3 and closes the first valve port 31. Since the electromagnetic force generated by the coil 19 between the valve body 17 and the moving iron 2 is greater than the elastic force of the second elastic member 10, the first valve seat 3 compresses the second elastic member 10 and abuts against the second valve seat 4 under the push of the moving iron 2, and the closing portion 36 closes the second valve port 41, which is the above-mentioned third state. At this time, the first oil port 5 and the second oil port 6 are separated, and the two-way sealing solenoid valve is in the above-mentioned fifth state.

[0043] If the liquid flows from the first oil port 5 to the second oil port 6, the pressure at the first oil port 5 gradually increases, and the switch mechanism is subjected to the liquid pressure in the direction toward the second oil port 6. Under the action of the liquid pressure, the moving iron 2 and the first valve seat 3 make the sealing at the first valve port 31 and the second valve port 41 more stable.

[0044] When the coil 19 is powered off again, the electromagnetic force is 0, and the movable iron 2 is acted upon by the elastic force of the first elastic member 9 in the direction away from the second oil port 6 and the liquid pressure in the direction toward the second oil port 6 at the same time. Since the liquid pressure on the movable iron 2 is related to the sealing area of ​​the first valve port 31, and the sealing area of ​​the first valve port 31 is small, the liquid pressure on the movable iron 2 is smaller than the elastic force of the first elastic member 9, and the movable iron 2 moves to the side away from the second oil port 6 and separates from the first valve port 31. The first valve port 31 is opened, and as the liquid flows from The liquid from the first valve port 31 flows toward the side of the first valve seat 3 close to the second oil port 6, and the liquid pressure on the first valve seat 3 gradually decreases. When the liquid pressure on the first valve seat 3 is less than the elastic force of the second elastic member 10, it moves toward the side of the moving iron 2 under the elastic force of the second elastic member 10 until it abuts against the limiting structure 7, and its closing portion 36 is separated from the second valve port 41. The second valve port 41 is opened, and the first oil port 5 and the second oil port 6 are connected. At this time, the switch mechanism is switched to the first state again, and the two-way sealing solenoid valve is switched to the fourth state.

[0045] like Figure 8 As shown, when the switch mechanism is in the third state and the two-way sealed solenoid valve is in the fifth state, if the liquid flows from the second oil port 6 to the first oil port 5, the pressure at the first oil port 6 gradually increases, and the switch mechanism is subjected to the liquid pressure in the direction away from the second oil port 6. Since the sealing area of ​​the sealing ring 20 of the second valve seat 4 is the largest, the liquid pressure on the second valve seat 4 is the largest, which is greater than the sum of the electromagnetic force and the elastic force of the second elastic member 10. Under the action of the liquid pressure, the second valve seat 4 pushes the first valve seat 3 and the moving iron 2 to move together to the side away from the second oil port 6 until the first valve seat 3 abuts against the limiting structure 7. In this process, the pressure on the moving iron 2 is related to the sealing area of ​​the first valve port 31. It is only necessary to ensure that the electromagnetic force on the moving iron 2 is greater than the sum of the elastic force of the first elastic member 9 and the liquid pressure. The first valve port 31 and the second valve port 41 are always kept closed, and the switch mechanism is switched to the second state. Since the first oil port 5 and the second oil port 6 are always in a cut-off state, the two-way sealed solenoid valve maintains the fifth state.

[0046] When the coil 19 is powered off again, the electromagnetic force is 0. The moving iron 2 is now subjected to the liquid pressure in the direction away from the second oil port 6 and the elastic force of the first elastic member 9, and moves toward the side away from the second oil port 6. The valve core column 18 is separated from the first valve port 31, and the first valve port 31 is opened. As the liquid flows from the first valve port 31 to the side of the sealing ring 20 of the second valve seat 4 away from the second oil port 6, the liquid pressure on the second valve seat 4 gradually decreases. When the liquid pressure on the second valve seat 4 is less than the elastic force of the second elastic member 10, it moves toward the side of the second oil port 6 under the action of the elastic force of the second elastic member 10 until it abuts against the limit baffle 8, and the closing portion 36 is separated from the second valve port 41, the second valve port 41 is opened, the first oil port 5 and the second oil port 6 are connected, and the switch mechanism is switched to the first state again, and the two-way sealing solenoid valve is switched to the fourth state.

[0047] By arranging a valve core assembly 1 elastically connected to the valve body assembly, a first valve seat 3 and a second valve seat 4 elastically connected to the first valve seat 3 in the valve body assembly, the three can move along the first direction in the first space under the interaction of electromagnetic force, elastic force and hydraulic force, and through mutual cooperation, the opening of the solenoid valve and the two-way sealing when the pressures of the first oil port 5 and the second oil port 6 are different can be achieved.

[0048] By opening a second valve port 41 with a large flow area, the solenoid valve can have a larger flow capacity when opened, and more brake fluid can pass through in a short time. Compared with the first valve port 31 with a smaller area than the second valve port 41, when there is a pressure difference between the first oil port 5 and the second oil port 6, the valve core assembly 1 needs to overcome a smaller liquid pressure when moving to open the first valve port 31 or keeping the first valve port 31 closed, thereby further improving the stability of the two-way sealing of the solenoid valve.

[0049] In a preferred embodiment, the minimum flow area between the second valve port 41 and the second oil port 6 is the first flow area, and the sum of the areas of the plurality of first oil ports 5 is smaller than the first flow area.

[0050] like Figure 13-15 As shown, in the previous design, in order to ensure that the solenoid valve has a large oil flow rate, the first oil port 5 is usually designed as a plurality of holes with a large flow area. However, in actual application, when the solenoid valve is opened and the liquid flows from the first oil port 5 to the second oil port 6, the liquid itself has viscosity, which will generate friction on the first valve seat 3 in the direction toward the second valve seat 4, thereby causing the first valve seat 3 to move in the direction of the liquid flow, closing the second valve port 41, and making the solenoid valve ineffective; at this time, the combined force on the first valve seat 3 is:

[0051] Among them, F 液F is the friction force on the first valve seat 3 generated when the liquid flows through the second valve port 41, 2 is the elastic force generated by the second elastic member 10, β 1 is the momentum correction coefficient of the liquid at the inlet of the second valve port 41, β 2 is the momentum correction coefficient of the liquid at the outlet of the second valve port 41, v 1 is the liquid flow rate at the inlet of the second valve port 41, v 2 is the liquid flow rate at the outlet of the second valve port 41, ρ is the liquid density, q 1 is the liquid flow through the second valve port 41; in order to reduce the liquid friction force on the first valve seat 3, the flow rate of the liquid through the second valve port 41 should be controlled; the first oil port 5 is designed as a plurality of holes with small flow areas, and the flow rate of each first oil port 5 can be expressed as:

[0052] Among them, C g is the liquid flow coefficient, A is the area of ​​the first oil port 5, ΔP is the pressure difference between the first oil port 5 away from the first space and the first space, q 2 For the liquid flow through the first oil port 5, when the liquid flow through the first oil port 5 is constant, the flow area of ​​the first oil port 5 is reduced, and the pressure difference at both ends of the first oil port 5 will increase accordingly. When the liquid pressure on the side of the first oil port 5 away from the first space is constant, the liquid pressure in the first space will decrease. The smaller the liquid pressure in the first space, the smaller the pressure difference generated on both sides of the inlet and outlet of the second valve port 41 when the liquid flows through the second valve port 41. Furthermore, the speed difference between the inlet and outlet of the second valve port 41 when the liquid flows through the second valve port 41 is also smaller, and finally the flow friction force generated by the liquid on the first valve seat 3 when it flows through the second valve port 41 can be reduced. Since the flow area of ​​the first oil port 5 is much smaller than the minimum flow area between the second valve port 41 and the second oil port 6, the liquid passing through the first oil port 5 will pass through the second valve port 41 and the inside of the second valve seat 4 and be quickly discharged from the second oil port 6, so that the sum of the flow areas of multiple first oil ports 5 is smaller than the first flow area, which can meet the large flow demand of the solenoid valve.

[0053] In a preferred embodiment, the first valve seat 3 has a plurality of first protrusions 32 on a side close to the limiting structure 7, and a first oil passage 37 is formed between two adjacent first protrusions 32. The plurality of first protrusions 32 can simultaneously abut against the limiting structure 7 to limit the movement of the first valve seat 3 away from the second oil port 6; the second valve seat 4 has a plurality of second protrusions 42 on a side close to the limiting baffle 8, and a second oil passage 47 is formed between two adjacent second protrusions 42. The plurality of second protrusions 42 can simultaneously abut against the limiting baffle 8 to limit the movement of the second valve seat 4 toward the second oil port 6.

[0054] like Fig. 9 and Fig.10 As shown, the limiting structure 7 is used to limit the movement of the first valve seat 3 away from the second oil port 6. The first valve seat 3 has a plurality of first protrusions 32 on the side close to the limiting structure 7. The plurality of first protrusions 32 are arranged around the first valve port 31, and a first oil channel 37 is formed between two adjacent first protrusions 32. When the first valve port 31 is opened, the liquid can flow on both sides of the first valve seat 3 through the plurality of first oil channels 37, the through hole and the first valve port 31, so that the pressure on both sides can be quickly balanced.

[0055] like Fig.11 and Fig.12 As shown, the limit baffle 8 is used to limit the movement of the second valve seat 4 toward the side close to the second oil port 6. The second valve seat 4 has a plurality of second protrusions 42 on the side close to the limit baffle 8, and a second oil channel 47 is formed between two adjacent second protrusions 42. The liquid can enter between the second valve seat 4 and the limit baffle 8 through the second oil channel 47, so that the pressure of the liquid can act on the end face of the second valve seat 4 close to the second oil port 6, pushing the switch mechanism as a whole to move away from the second oil port 6.

[0056] In a preferred embodiment, the first valve seat 3 has a first channel inside, the axis of the first channel extends along the first direction, and one end is connected to the first valve port 31, the first channel includes a first sealing cavity 33, a first guide cavity 34 and a first installation cavity 35 which are connected in sequence, the inner contour of the first sealing cavity 33 matches the outer contour of the valve core assembly 1 at one end close to the first valve seat 3, the inner diameter of the first guide cavity 34 gradually increases from the side close to the first valve port 31 to the side away from the first valve port 31, and the first installation cavity 35 is used to set the second elastic member.

[0057] In a preferred embodiment, the second valve seat 4 has a second channel inside, the axis of the second channel extends along the first direction, and one end is connected to the second valve port 41, the second channel includes a second sealing chamber 43, a second guide chamber 44, a second installation chamber 45 and a third guide chamber 46 which are connected in sequence, the inner contour of the second sealing chamber 43 matches the outer contour of the first valve seat 3 at one end close to the second valve seat 4, the inner diameter of the second guide chamber 44 gradually decreases from the side close to the second valve port 41 to the side away from the second valve port 41, the inner diameter of the third guide chamber 46 first decreases and then increases, and the second installation chamber 45 is also used to set the second elastic member 10.

[0058] like Fig.10As shown, the first sealing chamber 33, the first flow guiding chamber 34 and the first installation chamber 35 are connected in sequence from the side away from the second oil port 6 to the side close to the second oil port 6, and the first valve port 31 is formed at the first sealing chamber 33. In the bidirectional sealed solenoid valve with a normally closed function, the inner contour of the first sealing chamber 33 matches the outer contour of the steel ball 16, and the steel ball 16 abuts in the first sealing chamber 33, so that the first valve port 31 can be closed. In the bidirectional sealed solenoid valve with a normally open function, the inner contour of the first sealing chamber 33 matches the outer contour of the valve core column 18 close to the first valve seat 3, and the valve core column 18 abuts in the first sealing chamber 33, so that the first valve port 31 can be closed; the first flow guiding chamber 34 is a 10° cone angle hole structure, and its inner diameter gradually increases along the first direction toward the second oil port 6 side. When the switch mechanism switches from the third state to the first state, the cone angle hole structure can make the first valve seat 3 subject to additional liquid pressure, accelerate its speed of moving to the side away from the second oil port 6, which is conducive to the rapid opening of the solenoid valve.

[0059] like Fig.12 As shown, the second sealing chamber 43, the second guide chamber 44 and the second installation chamber 45 are connected in sequence from the side away from the second oil port 6 to the side close to the second oil port 6, and the second valve port 41 is formed at the second sealing chamber 43. The inner contour of the second sealing chamber 43 matches the outer contour of the closing portion 36 of the first valve seat 3. The closing portion 36 abuts against the inside of the second sealing chamber 43, so that the second valve port 41 can be closed. The second guide chamber 44 is also a tapered hole structure. Through the tapered surface structure inside it, the liquid can quickly enter the second installation chamber 45 after passing through the second valve port 41. The inner diameter of the third guide chamber 46 is first reduced and then increased, which can effectively reduce the resistance of the liquid when passing through and reduce the liquid pressure loss.

[0060] like Figure 3 and Figure 6 As shown, by arranging the two ends of the second elastic member 10 in the first installation cavity 35 and the second installation cavity 45 and changing the original structure of the spring sleeve being arranged on the periphery of the valve seat, it is possible to prevent the liquid from being blocked by the second elastic member 10 when flowing. The pressure of the liquid when flowing can be evenly distributed on the outside of the first valve seat 3, and then the first valve seat 3 can be evenly stressed, thereby avoiding uneven stress and causing it to tilt.

[0061] In a preferred embodiment, the limiting baffle 8 has a third channel inside, the axis of the third channel extends along the first direction, and includes a first flow cavity 81 and a second flow cavity 82 connected in sequence, and the inner diameter of the first flow cavity 81 is smaller than the inner diameter of the second flow cavity 82.

[0062] like Fig.16 As shown, by opening a first circulation cavity 81 and a second circulation cavity 82 with different inner diameters inside the limit baffle 8, the third channel forms a stepped structure, which can optimize the distribution and flow direction of the liquid when it enters the first space from the second oil port 6, and help improve the liquid flow state.

[0063] In a preferred embodiment, the distance between one end of the steel ball 16 close to the first valve seat 3 and the first valve port 31 along the first direction is recorded as the first distance. When the switch mechanism switches from the first state to the second state, the distance moved by the moving iron 2 is equal to the sum of the distance moved by the first valve seat 3 and the first distance.

[0064] like Figure 3 As shown, in the bidirectional sealed solenoid valve with a normally closed function, when the switch mechanism is switched from the first state to the second state, the distance moved by the first valve seat 3 is recorded as the third distance, when the moving iron 2 moves the first distance toward the second oil port 6, the steel ball 16 closes the first valve port 31, and when the moving iron 2 continues to push the first valve seat 3 to move the third distance toward the second oil port 6, the closing portion 36 of the first valve seat 3 can close the second valve port 41, the first valve port 31 and the second valve port 41 are closed, and the bidirectional sealed solenoid valve is switched to the fifth state.

[0065] In a preferred embodiment, the distance between one end of the valve core column 18 close to the first valve seat 3 and the first valve port 31 along the first direction is recorded as the second distance. When the switch mechanism switches from the first state to the second state, the distance between the moving iron 2 and the valve body 17 along the first direction is greater than the sum of the distance moved by the first valve seat 3 and the second distance.

[0066] like Figure 6 As shown, in a bidirectional sealed solenoid valve with a normally open function, when the switch mechanism is in the first state, the axial distance between the closing portion 36 and the second valve port 41 is recorded as the fourth distance, when the moving iron 2 moves the second distance toward the second oil port 6, the valve core column 18 closes the first valve port 31, and when the moving iron 2 continues to push the first valve seat 3 to move the fourth distance toward the second oil port 6, the closing portion 36 of the first valve seat 3 can close the second valve port 41. By making the distance between the moving iron 2 and the valve body 17 along the first direction greater than the sum of the second distance and the fourth distance, it can be ensured that when the switch mechanism is switched from the first state to the second state, the distance moved by the moving iron 2 toward the second oil port 6 can close the first valve port 31 and the second valve port 41, and will not be limited by the valve body 17.

[0067] like Fig.17 As shown, in a bidirectional sealed solenoid valve with a normally closed function, when liquid enters the first base 13 from the first oil port 5 and then enters the magnetic isolation tube 12 through the first oil channel 37 and the through hole, the air in the magnetic isolation tube 12 can be discharged from the flow gap formed between the inner wall of the second base 14 and the flow portion 132, so that the liquid can quickly fill the interior of the magnetic isolation tube 12.

[0068] like Fig.15As shown, in a bidirectional sealed solenoid valve with a normally open function, a third oil port 11 is opened on the valve body 17 corresponding to the space where the valve core column 18 is located. When the liquid enters the space where the second valve seat 4 is located through the first oil port 5, and then enters the space where the valve core column 18 is located through the first oil channel 37 and the through hole, the air in the space where the valve core column 18 is located can be discharged from the third oil port 11, so that the liquid can quickly fill the interior of the valve body 17.

[0069] Working principle: In a bidirectional sealed solenoid valve with a normally closed function, initially, the coil 19 is energized to generate a magnetic field, the moving iron 2 is acted upon by an electromagnetic force and the electromagnetic force is greater than the elastic force of the first elastic member 9, the moving iron 2 is located on the side of the magnetic isolation tube 12 close to the stationary iron 15, the first valve seat 3 and the second valve seat 4 are respectively abutted against the limiting structure 7 and the limiting baffle 8 under the elastic force of the second elastic member 10, the steel ball 16 is separated from the first valve port 31, the first valve port 31 is opened, the closing portion 36 is separated from the second valve port 41, the second valve port 41 is opened, and the first oil port 5 and the second oil port 6 are connected.

[0070] When the coil 19 is de-energized, the electromagnetic force is 0, and the moving iron 2 moves toward the side close to the first valve seat 3 under the elastic force of the first elastic member 9. The steel ball 16 abuts against the first valve seat 3 and closes the first valve port 31. Since the elastic force of the first elastic member 9 is greater than the elastic force of the second elastic member 10, the first valve seat 3 compresses the second elastic member 10 and abuts against the second valve seat 4 under the push of the moving iron 2. The closing portion 36 closes the second valve port 41. At this time, the first oil port 5 and the second oil port 6 are separated.

[0071] If the liquid flows from the first oil port 5 to the second oil port 6, the pressure at the first oil port 5 gradually increases, and the switch mechanism is subjected to the liquid pressure in the direction toward the second oil port 6. Under the action of the liquid pressure, the moving iron 2 and the first valve seat 3 make the sealing at the first valve port 31 and the second valve port 41 more stable; when the coil 19 is energized again to generate a magnetic field, the moving iron 2 is now subjected to the electromagnetic force in the direction toward the stationary iron 15, the liquid pressure in the direction toward the second oil port 6, and the elastic force of the first elastic member 9. Since the electromagnetic force on the moving iron 2 is greater than the liquid pressure and the elastic force of the first elastic member 9, the moving iron 2 is subjected to the electromagnetic force in the direction toward the stationary iron 15, the liquid pressure in the direction toward the second oil port 6, and the elastic force of the first elastic member 9. The sum of the elastic forces of the second elastic member 9, the moving iron 2 moves toward the side of the stationary iron 15 along the first direction, the steel ball 16 separates from the first valve port 31, and the first valve port 31 opens. As the liquid flows from the first valve port 31 to the side of the first valve seat 3 close to the second oil port 6, the liquid pressure on the first valve seat 3 gradually decreases. When the liquid pressure on the first valve seat 3 is less than the elastic force of the second elastic member 10, it moves toward the side of the stationary iron 15 under the action of the elastic force of the second elastic member 10, and its closing portion 36 separates from the second valve port 41. The second valve port 41 opens, and the first oil port 5 and the second oil port 6 are connected.

[0072] If the liquid flows from the second oil port 6 to the first oil port 5, the pressure at the first oil port 6 gradually increases, and the switch mechanism is subjected to the liquid pressure in the direction toward the side of the static iron 15. Since the sealing area of ​​the sealing ring 20 of the second valve seat 4 is the largest, the liquid pressure exerted on the second valve seat 4 is the largest, which is greater than the sum of the elastic forces of the first elastic member 9 and the second elastic member 10. Under the action of the liquid pressure, the second valve seat 4 pushes the first valve seat 3 and the moving iron 2 to move away from the second oil port 6 until the first valve seat 3 abuts against the limiting structure 7. In this process, the liquid pressure exerted on the moving iron 2 is only related to the sealing area of ​​the first valve port 31. It is only necessary to ensure that the elastic force of the first elastic member 9 exerted on the moving iron 2 is greater than the liquid pressure exerted on it. The first valve port 31 and the second valve port 41 are always kept closed, and the first oil port 5 and the second oil port 6 are always in a cut-off state. When the coil 19 is closed again When the magnetic field is generated by the first power-on, the moving iron 2 is simultaneously acted upon by the electromagnetic force and liquid pressure in the direction toward the side of the stationary iron 15 and the elastic force of the first elastic member 9 in the direction toward the side of the second oil port 6. Since the electromagnetic force on the moving iron 2 is greater than the elastic force of the first elastic member 9, the moving iron 2 moves toward the side of the stationary iron 15, the steel ball 16 separates from the first valve port 31, and the first valve port 31 opens. As the liquid flows from the first valve port 31 to the side of the sealing ring 20 of the second valve seat 4 away from the second oil port 6, the liquid pressure on the second valve seat 4 gradually decreases. When the liquid pressure on the second valve seat 4 is less than the elastic force of the second elastic member 10, it moves toward the side of the second oil port 6 under the action of the elastic force of the second elastic member 10 until it abuts against the limit baffle 8, the closing portion 36 separates from the second valve port 41, the second valve port 41 opens, and the first oil port 5 and the second oil port 6 are connected.

[0073] In a bidirectional sealed solenoid valve with a normally open function, initially, the coil 19 is de-energized, and the moving iron 2 is located on the side of the magnetic isolation tube 12 away from the first valve seat 3 under the elastic force of the first elastic member 9. The first valve seat 3 and the second valve seat 4 are respectively abutted against the limiting structure 7 and the limiting baffle 8 under the elastic force of the second elastic member 10. The valve core column 18 is separated from the first valve port 31, and the first valve port 31 is opened. The closing portion 36 is separated from the second valve port 41, and the second valve port 41 is opened. At this time, the first oil port 5 and the second oil port 6 are connected.

[0074] When the coil 19 is energized, the moving iron 2 compresses the first elastic member 9 and moves toward the side close to the valve body 17 under the action of the magnetic field force of the coil 19, and the valve core column 18 abuts against the first valve seat 3 and closes the first valve port 31. Since the electromagnetic force generated by the coil 19 between the valve body 17 and the moving iron 2 is greater than the elastic force of the second elastic member 10, the first valve seat 3 compresses the second elastic member 10 and abuts against the second valve seat 4 under the push of the moving iron 2, and the closing portion 36 closes the second valve port 41. At this time, the first oil port 5 and the second oil port 6 are separated.

[0075] If the liquid flows from the first oil port 5 to the second oil port 6, the pressure at the first oil port 5 gradually increases, and the switch mechanism is subjected to the liquid pressure in the direction toward the second oil port 6. Under the action of the liquid pressure, the moving iron 2 and the first valve seat 3 make the seals at the first valve port 31 and the second valve port 41 more stable; when the coil 19 is powered off again, the electromagnetic force is 0, and the moving iron 2 is subjected to the elastic force of the first elastic member 9 in the direction away from the second oil port 6 and the liquid pressure in the direction toward the second oil port 6 at the same time. Since the liquid pressure on the moving iron 2 is related to the sealing area of ​​the first valve port 31, and the sealing area of ​​the first valve port 31 is relatively small, The liquid pressure it is subjected to is less than the elastic force of the first elastic member 9, the moving iron 2 moves to the side away from the second oil port 6 and separates from the first valve port 31, the first valve port 31 opens, and as the liquid flows from the first valve port 31 to the side of the first valve seat 3 close to the second oil port 6, the liquid pressure exerted on the first valve seat 3 gradually decreases. When the liquid pressure exerted on the first valve seat 3 is less than the elastic force of the second elastic member 10, it moves to the side of the moving iron 2 under the action of the elastic force of the second elastic member 10 until it abuts against the limiting structure 7, and its closing portion 36 is separated from the second valve port 41, the second valve port 41 opens, and the first oil port 5 and the second oil port 6 are connected.

[0076] If the liquid flows from the second oil port 6 to the first oil port 5, the pressure at the first oil port 6 gradually increases, and the switch mechanism is subjected to the liquid pressure in the direction away from the second oil port 6. Since the sealing area of ​​the sealing ring 20 of the second valve seat 4 is the largest, the liquid pressure on the second valve seat 4 is the largest, which is greater than the sum of the electromagnetic force and the elastic force of the second elastic member 10. Under the action of the liquid pressure, the second valve seat 4 pushes the first valve seat 3 and the moving iron 2 to move together to the side away from the second oil port 6 until the first valve seat 3 abuts against the limiting structure 7. In this process, the pressure on the moving iron 2 is related to the sealing area of ​​the first valve port 31. It is only necessary to ensure that the electromagnetic force on the moving iron 2 is greater than the sum of the elastic force of the first elastic member 9 and the liquid pressure, and the first valve port 31 and the second valve port 41 are always kept closed, and the first oil port 5 and the second The oil ports 6 are always in an isolated state; when the coil 19 is powered off again, the electromagnetic force is 0, and the moving iron 2 is acted upon by the liquid pressure in the direction away from the second oil port 6 and the elastic force of the first elastic member 9 at the same time, and moves toward the side away from the second oil port 6, the valve core column 18 separates from the first valve port 31, and the first valve port 31 opens. As the liquid flows from the first valve port 31 to the side of the sealing ring 20 of the second valve seat 4 away from the second oil port 6, the liquid pressure on the second valve seat 4 gradually decreases. When the liquid pressure on the second valve seat 4 is less than the elastic force of the second elastic member 10, it moves toward the side of the second oil port 6 under the elastic force of the second elastic member 10 until it abuts against the limit baffle 8, the closing portion 36 separates from the second valve port 41, the second valve port 41 opens, and the first oil port 5 and the second oil port 6 are connected. This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A bidirectional sealing solenoid valve for a brake system, characterized in that: include: A valve body assembly, wherein a coil (19) is sleeved around the outer periphery of the valve body assembly, and a first space is provided inside the valve body assembly, a limit structure (7) and a limit baffle (8) are provided in the first space, and a first oil port (5) and a second oil port (6) are provided on the valve body assembly and are communicated with the first space; A switch mechanism, the switch mechanism is arranged in the first space, comprising: A valve core assembly (1), wherein a first elastic member (9) is provided between the valve core assembly (1) and the valve body assembly, and the valve core assembly (1) can move along a first direction under the action of the elastic force of the first elastic member (9) and the magnetic field force of the coil (19); a first valve seat (3), the first valve seat (3) being arranged on a side of the valve core assembly (1) close to the second oil port (6), and having a first valve port (31) at one end of the first valve seat (3) close to the valve core assembly (1); a second valve seat (4), the second valve seat (4) being arranged on a side of the first valve seat (3) close to the second oil port (6), and having a second elastic member (10) arranged between the second valve seat (4) and the first valve seat (3), the second valve seat (4) being slidably sealed with the valve body assembly, and having a second valve port (41) at one end close to the first valve seat (3), the area of ​​the second valve port (41) being larger than the area of ​​the first valve port (31); The switch mechanism has a first state, a second state, and a third state; When in the first state, the valve core assembly (1) and the first valve port (31) are separated, the first valve seat (3) and the second valve port (41) are separated, the first valve seat (3) abuts against the limiting structure (7), the second valve seat (4) abuts against the limiting baffle (8), and the first valve port (31) and the second valve port (41) are open; When in the second state, the valve core assembly (1) closes the first valve port (31), the first valve seat (3) closes the second valve port (41), and the first valve seat (3) abuts against the limiting structure (7); When in the third state, the valve core assembly (1) closes the first valve port (31), the first valve seat (3) closes the second valve port (41), and the second valve seat (4) abuts against the limit stopper (8); The bidirectional sealing solenoid valve has a fourth state and a fifth state. When in the fourth state, the first oil port (5) is connected to the second oil port (6); when in the fifth state, the first oil port (5) is isolated from the second oil port (6). When the switch mechanism is in the first state and the bidirectional sealing solenoid valve is in the fourth state, the switch mechanism can be switched to the third state under the action of the elastic force of the first elastic member (9) and the magnetic field force of the coil (19), and then maintain the third state or switch to the second state under the action of the pressure difference between the first oil port (5) and the second oil port (6), so that the bidirectional sealing solenoid valve is switched from the fourth state to the fifth state and maintains stable sealing; When the switch mechanism is in the second state and the bidirectional sealing solenoid valve is in the fifth state, the valve core assembly (1) can move away from the second oil port (6) under the elastic force of the first elastic member (9) and the magnetic field force of the coil (19), and the second valve seat (4) can move toward the second oil port (6) under the elastic force of the second elastic member (10) until it abuts against the limit stopper (8), and the switch mechanism switches from the second state to the first state, and the bidirectional sealing solenoid valve switches from the fifth state to the fourth state; When the switch mechanism is in the third state and the bidirectional sealing solenoid valve is in the fifth state, the valve core assembly (1) can move away from the second oil port (6) under the action of the elastic force of the first elastic member (9) and the magnetic field force of the coil (19), and then the first valve seat (3) can move away from the second oil port (6) under the action of the elastic force of the second elastic member (9) until it abuts against the limiting structure (7), and the switch mechanism switches from the third state to the first state, and the bidirectional sealing solenoid valve switches from the fifth state to the fourth state.

2. A bidirectional sealing solenoid valve for a brake system according to claim 1, characterized in that: The minimum flow area between the second valve port (41) and the second oil port (6) is a first flow area, and the sum of the areas of the plurality of first oil ports (5) is smaller than the first flow area.

3. A bidirectional sealing solenoid valve for a brake system according to claim 1, characterized in that: The valve body assembly comprises a first base (13), a second base (14) is sleeved on the outer periphery of the first base (13), and also comprises a magnetic isolation tube (12), one end of the magnetic isolation tube (12) is fixed to the second base (14), and the other end is fixed with a static iron (15), the first base (13), the second base (14) and the magnetic isolation tube (12) are internally connected to form the first space, a plurality of first oil ports (5) are provided on the side wall of the first base (13), the inner wall of the end close to the static iron (15) forms the limiting structure (7), the inner wall of the end away from the static iron (15) is fixed with the limiting baffle (8), and the end of the second base (14) away from the static iron (15) is provided with a first oil port (5) on the side wall of the first base (13). The second oil port (6) is provided at the end thereof, and a connecting port (21) is also provided on the side wall thereof at a position corresponding to the first oil port (5); the first valve seat (3) and the second valve seat (4) are arranged in the first base (13); the end of the first valve seat (3) close to the first valve port (31) can penetrate the limiting structure (7) and extend out of the first base (13); the valve core assembly (1) comprises a moving iron (2) and a steel ball (16); the moving iron (2) is arranged in the magnetic isolation tube (12), and the first elastic member (9) is provided between the moving iron (2) and the static iron (15); the steel ball (16) is arranged at the end of the moving iron (2) away from the static iron (15) for closing the first valve port (31).

4. A bidirectional sealing solenoid valve for a brake system according to claim 1, characterized in that: The valve body assembly comprises a valve body (17), one end of the valve body (17) is sleeved and fixed with a magnetic isolation tube (12), the valve body (17) is connected to the inside of the magnetic isolation tube (12) to form the first space, a plurality of the first oil ports (5) are provided on the side wall of the valve body (17), and the second oil port (6) is provided on the end away from the magnetic isolation tube (12), the inner wall of the valve body (17) forms the limiting structure (7), the limiting baffle (8) is fixed inside the valve body between the limiting structure (7) and the second oil port (6), and the side of the limiting baffle (8) close to the limiting structure (7) abuts against the limiting structure (7) on a valve body (17); the first valve seat (3) and the second valve seat (4) are arranged between the limiting structure (7) and the limiting baffle (8); the end of the first valve seat (3) close to the first valve port (31) can penetrate the limiting structure (7); the valve core assembly (1) comprises a movable iron (2) and a valve core column (18); the movable iron (2) is arranged in the magnetic isolation tube (12); the valve core column (18) is arranged at the end of the movable iron (2) close to the first valve seat (3) for closing the first valve port (31); the first elastic member (9) is provided between the valve core column (18) and the limiting structure (7).

5. A bidirectional sealing solenoid valve for a brake system according to claim 1, characterized in that: The first valve seat (3) has a plurality of first protrusions (32) on a side close to the limiting structure (7), a first oil passage (37) is formed between two adjacent first protrusions (32), and the plurality of first protrusions (32) can simultaneously abut against the limiting structure (7) to limit the movement of the first valve seat (3) away from the second oil port (6); the second valve seat (4) has a plurality of second protrusions (42) on a side close to the limiting baffle (8), a second oil passage (47) is formed between two adjacent second protrusions (42), and the plurality of second protrusions (42) can simultaneously abut against the limiting baffle (8) to limit the movement of the second valve seat (4) towards the second oil port (6).

6. A bidirectional sealing solenoid valve for a brake system according to claim 1, characterized in that: The first valve seat (3) has a first channel inside, the axis of the first channel extending along the first direction, and one end of the first channel connected to the first valve port (31), the first channel comprising a first sealing cavity (33), a first flow guide cavity (34) and a first installation cavity (35) which are connected in sequence, the inner contour of the first sealing cavity (33) matches the outer contour of the valve core assembly (1) at one end close to the first valve seat (3), the inner diameter of the first flow guide cavity (34) gradually increases from a side close to the first valve port (31) to a side away from the first valve port (31), and the first installation cavity (35) is used to set the second elastic member.

7. A bidirectional sealing solenoid valve for a brake system according to claim 6, characterized in that: The second valve seat (4) has a second channel inside, the axis of the second channel extends along the first direction, and one end of the second channel is connected to the second valve port (41), the second channel comprises a second sealing cavity (43), a second flow guide cavity (44), a second installation cavity (45) and a third flow guide cavity (46) which are connected in sequence, the inner contour of the second sealing cavity (43) matches the outer contour of the first valve seat (3) at one end close to the second valve seat (4), the inner diameter of the second flow guide cavity (44) gradually decreases from the side close to the second valve port (41) to the side away from the second valve port (41), the inner diameter of the third flow guide cavity (46) first decreases and then increases, and the second installation cavity (45) is also used to set the second elastic member (10).

8. A bidirectional sealing solenoid valve for a brake system according to claim 1, characterized in that: The limiting baffle (8) has a third channel inside, the axis of the third channel extending along the first direction, comprising a first circulation cavity (81) and a second circulation cavity (82) which are connected in sequence, and the inner diameter of the first circulation cavity (81) is smaller than the inner diameter of the second circulation cavity (82).

9. A bidirectional sealing solenoid valve for a brake system according to claim 3, characterized in that: The distance between one end of the steel ball (16) close to the first valve seat (3) and the first valve port (31) along the first direction is recorded as a first distance, and when the switch mechanism switches from the first state to the second state, the distance moved by the moving iron (2) is equal to the sum of the distance moved by the first valve seat (3) and the first distance.

10. A bidirectional sealing solenoid valve for a brake system according to claim 4, characterized in that: The distance between one end of the valve core column (18) close to the first valve seat (3) and the first valve port (31) along the first direction is recorded as a second distance. When the switch mechanism switches from the first state to the second state, the distance between the moving iron (2) and the valve body (18) along the first direction is greater than the sum of the distance moved by the first valve seat (3) and the second distance.

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