High-pressure zero-leakage high-response double-position self-locking cartridge electromagnetic valve

Abstract

The utility model discloses a high-pressure zero-leakage high-response double-position self-locking plug-in mounting type electromagnetic valve, and relates to the technical field of double-position self-locking plug-in mounting type electromagnetic valves. The stop iron and the armature assembly are sequentially arranged in the middle of the interior of the shell from left to right, the open coil, the radial permanent magnet assembly and the close coil are sequentially arranged on the inner wall of the shell from left to right, and the valve sleeve assembly is located outside the shell. And an iron core assembly is arranged between the middle part in the shell and the inner wall of the shell. According to the utility model, the valve port sealing structure is separated from the armature, so that the valve core or the valve seat is prevented from being fixed on the armature through a special process; the valve port sealing structure adopts the steel ball and the orifice sharp edge for sealing, is suitable for high-pressure working conditions, can realize zero leakage, and is high in sealing reliability, higher in manufacturability, long in service life and free of maintenance.

Description

Technical Field

[0001] The utility model relates to the technical field of a two-position self-locking cartridge type solenoid valve, in particular to a high-pressure, zero-leakage and high-response two-position self-locking cartridge type solenoid valve. Background Art

[0002] The existing technologies and disadvantages of the existing self-locking solenoid valve are as follows:

[0003] a) Existing self-locking solenoid valves usually integrate the valve core or valve seat on the armature (i.e., the moving iron that is polarized and moved when the electromagnetic coil is energized). Since the armature must be made of soft magnetic material with good magnetic conductivity, and such materials generally have low strength, the valve core or valve seat cannot be directly processed on the armature. Usually, they are fixed to the armature through a certain process (such as rubber vulcanization, bonding, etc.), which will inevitably lead to low reliability, poor processability, and difficult maintenance and replacement of the self-locking solenoid valve, and it is difficult to adapt to high-pressure and high-sealing reliability working scenarios.

[0004] b) In order to achieve high sealing performance, existing self-locking solenoid valves mostly adopt the valve port sealing design of "soft valve core, hard valve seat" or "soft valve seat, hard valve core" (that is, the valve core is made of a relatively soft material compared to the valve seat to ensure a good fit between the two to achieve strict sealing requirements, such as rubber, plastic, and a combination of soft metal and hard metal). Each time this type of sealing structure is closed and sealed, it is bound to be accompanied by a relatively large local deformation and wear of the relatively soft one of the valve core or valve sleeve, resulting in a short service life of the self-locking solenoid valve, difficulty in maintenance, and difficulty in adapting to high pressure and high reliability design requirements.

[0005] c) The existing self-locking solenoid valve is based on the above a) and b) and is usually suitable for low-pressure working conditions. In order to achieve lightweight design requirements, the electromagnetic force and electromagnetic force margin of the existing technical solutions are generally small. Increasing the electromagnetic force to improve the response speed of the solenoid valve is an important design approach. With the development of self-locking solenoid valve technology, the design demand for self-locking solenoid valves with high response switching has greatly increased. The low response speed of the existing self-locking solenoid valves can no longer meet today's high-response design requirements.

[0006] d) The existing self-locking solenoid valve is based on the above a) and b), and its installation method is usually designed as a pipe installation. Therefore, a special pipe joint needs to be designed on the self-locking solenoid valve, and then connected to the pipeline. Therefore, the existing technical structure design size is large and difficult to maintain and replace, which is inconsistent with today's increasingly miniaturized and integrated design requirements.

[0007] e) Chinese invention patent "A medium-isolated permanent magnet self-locking solenoid valve for aerospace use" (application number: 202211504812.0) discloses a straight-through two-position two-way permanent magnet self-locking solenoid valve, including a solenoid valve body, an armature, a transmission part, an elastic part, a sealing valve, an electromagnetic drive assembly and a permanent magnet self-locking assembly; in this patent, the electromagnetic force and the permanent magnet magnetic attraction force are transmitted to the sealing valve valve core through the elastic part at the sealing valve to achieve a greater purpose of designing the electromagnetic force and the permanent magnet magnetic attraction force margin; however, because the elastic part is placed at the end of the sealing valve, it is limited by size, and the elastic force value of the elastic part is designed to be small, it cannot adapt to other forms of valve port sealing structures, and the applicable pressure is small; furthermore, in this patent, all permanent magnets are spliced ​​and arranged to form a complete ring that fits tightly to each other, requiring a single permanent magnet to be designed in a fan shape, with the two end faces of the magnetic pole as cylindrical surfaces, requiring high requirements for the permanent magnet magnetization process and processing accuracy, and poor processability.

[0008] In summary, the existing self-locking solenoid valves have low applicable pressure and slow power-on switching response speed. They also have problems such as low lifespan, low sealing reliability, large size, and difficulty in maintenance and replacement.

[0009] Therefore, in order to solve the above problems, it is urgent to develop a double-position self-locking cartridge solenoid valve with small size, high pressure, long life cycle, zero leakage, high sealing reliability, high response, and easy maintenance and replacement. Summary of the invention

[0010] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and to provide a high-pressure, zero-leakage, high-response, two-position, self-locking, cartridge-type solenoid valve, which can achieve optimal lightweight design, adapt to high-pressure working conditions, high life cycle, zero leakage, high sealing reliability, high response, and easy maintenance and replacement.

[0011] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a high-pressure zero-leakage high-response double-position self-locking plug-in solenoid valve, characterized in that it comprises a housing, a stopper iron and an armature assembly arranged in sequence from left to right in the middle of the housing, an opening coil, a radial permanent magnet assembly and a closing coil arranged in sequence from left to right on the inner wall of the housing, and a valve sleeve assembly located outside the housing; an iron core assembly is arranged between the inner middle of the housing and the inner wall of the housing;

[0012] The armature assembly includes an armature, a spring seat located in the armature, a push rod with a right end located in the armature and a left end extending out of the armature and penetrating the stopper, and a spring with a right end sleeved on the spring seat and a left end connected to the right end of the push rod;

[0013] The valve sleeve assembly includes a filter element assembly and a base from left to right, and the transmission rod is located in the base cavity; an oil return port is opened at the right end of the base; the oil return port is connected to the left side of the base cavity through a first orifice, and a first steel ball is arranged at the connection point; the right side of the base cavity is connected to the filter element assembly through a second orifice, and a second steel ball is arranged at the connection point;

[0014] The left end of the push rod is aligned with the right side of the first steel ball.

[0015] In the above technical solution, the core assembly includes a first magnetic conductor, a magnetic isolation ring, and a second magnetic conductor. The first magnetic conductor is located at the right end of the armature assembly, the magnetic isolation ring is located between the armature and the open coil, the radial permanent magnet assembly and the closed coil, and the second magnetic conductor is located between the stop iron and the shell and the open coil; the first magnetic conductor, the magnetic isolation ring, and the second magnetic conductor are connected by laser welding.

[0016] In the above technical solution, the radial permanent magnet assembly includes a retaining frame and a plurality of permanent magnets evenly arranged in the retaining frame, and the S poles of the permanent magnets face radially inwards.

[0017] In the above technical solution, the spring seat is fixed in the armature by a cylindrical pin.

[0018] In the above technical solution, a first mounting groove is opened at the left end of the armature, a retaining ring is mounted on the top rod, and the retaining ring is located in the first mounting groove; two second mounting grooves are opened on the outer wall of the armature, and a slip ring with an oblique cut is located in the second mounting groove.

[0019] In the above technical solution, the base includes a first base and a second base located on the left side of the first base, the first base and the second base are connected by laser welding, and a control port is provided at the connection between the first base and the second base.

[0020] In the above technical solution, the permanent magnet is rectangular.

[0021] In the above technical solution, the stop iron is connected to the first base via a guide sleeve.

[0022] In the above technical solution, a first sealing ring is installed between the left end of the stop iron and the second magnetic conductor; a second sealing ring is arranged at the right end of the first base, and a third sealing ring and a first protective ring are arranged at the left end; a fourth sealing ring and a second protective ring are arranged on the second base.

[0023] Compared with the prior art, the utility model has the following advantages.

[0024] 1) The utility model separates the valve port sealing structure from the armature, avoiding the need to fix the valve core or valve seat on the armature through a special process; the valve port sealing structure of the utility model adopts a steel ball and a sharp edge of the orifice for sealing, which is suitable for high-pressure working conditions, can achieve zero leakage, has high sealing reliability, high processability, long service life, and requires no maintenance.

[0025] 2) The utility model adopts the steel ball and the sharp edge of the orifice for sealing. The first steel ball and the first base, the second steel ball and the second base are all metal parts with relatively high strength, thus avoiding large local deformation and wear of the first base and the second base when the valve port is closed. The utility model has a high service life and does not require maintenance or replacement during the entire service life, and is suitable for high-pressure working conditions with high sealing reliability.

[0026] 3) The utility model designs a longer spring inside the armature, obtains the required spring force after pre-compression, and transmits the force and displacement of the armature to the first steel ball through the spring to achieve the opening and closing of the valve port; the force transmitted by the first steel ball is equal to the spring force, and has nothing to do with the electromagnetic force and the magnetic attraction of the permanent magnet on the armature, but at the same time inherits the same displacement of the armature, and achieves the opening and closing of the valve port while avoiding the damage to the first base by the larger electromagnetic force and the magnetic attraction of the permanent magnet. Therefore, the utility model can design the electromagnetic force and the magnetic attraction of the permanent magnet to be very large to obtain a high response speed and high self-locking reliability. At the same time, because the spring is placed in the armature, the spring size can be designed to be longer to obtain a larger spring force, so as to adapt to higher pressures and valve port sealing forms with different structures.

[0027] 4) In the utility model, a single permanent magnet is designed to be rectangular, the length of the permanent magnet is adapted to the width of the cage slot, the permanent magnet is bonded to the cage slot with a heat-resistant adhesive, and the permanent magnet S pole is evenly arranged in the cage with the radial inward direction, thus avoiding the high processing technology and more difficult magnetization process requirements of the sector-shaped permanent magnet, and the processability is higher.

[0028] 5) The utility model no longer sets a magnetic guide ring at the position of the permanent magnet. By increasing the magnetic attraction of the permanent magnet and optimizing the magnetic circuit, the same magnetic performance requirements of the three-section core assembly are met, which reduces the process difficulty of the double-position self-locking solenoid valve to a certain extent.

[0029] 6) The utility model adopts an integrated plug-in design, the structure design is more compact, the size is small, and the replacement is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the utility model.

[0031] Figure 2 It is a structural schematic diagram of the armature assembly.

[0032] Figure 3 It is a structural schematic diagram of the filter element assembly.

[0033] Figure 4 Schematic diagram of the structure of the radial permanent magnet assembly.

[0034] Figure 5 A cross-sectional view of a radial permanent magnet assembly.

[0035] Figure 6 It is a schematic diagram of the structure of a radial permanent magnet assembly in the prior art.

[0036] Among them, 1-housing, 2-stop iron, 3-armature assembly, 31-armature, 311-first mounting groove, 312-second mounting groove, 32-top rod, 33-spring, 331-spring seat, 34-cylindrical pin, 35-stop ring, 36-slip ring, 41-first magnetic conductor, 42-magnetic isolation ring, 43-second magnetic conductor, 5-open coil, 6-radial permanent magnet assembly, 61-cage, 62-permanent magnet, 7-close coil, 8-valve sleeve assembly, 81-base, 811-oil return port, 812-first orifice, 813-second orifice, 814-first base, 815-second base, 816-control port, 82-filter element assembly, 821-oil supply port, 83-transmission rod, 841-first steel ball, 842-second steel ball, 9-guide sleeve, 101-first sealing ring, 102-second sealing ring, 103-third sealing ring, 104-first protective ring, 105-fourth sealing ring, 106-second protective ring. DETAILED DESCRIPTION

[0037] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.

[0038] The utility model is applicable to a parking / emergency brake valve of an aircraft landing gear control system, and provides a pilot high-pressure oil for a parking module decompression device of the parking / emergency brake valve. A voltage is provided to an opening coil 5 or a closing coil 7 of a self-locking solenoid valve through a parking / emergency brake valve controller (the controller controls the voltage for a few seconds and then delays power off), so that the self-locking solenoid valve is opened or closed, thereby controlling the on and off of the pilot high-pressure oil provided to the decompression device, and at the same time having the function of maintaining the previous power-on state after the delayed power off.

[0039] Referring to the attached drawings, it can be seen that: a high-pressure zero-leakage high-response double-position self-locking cartridge solenoid valve is characterized in that it comprises a housing 1, a stopper 2 and an armature assembly 3 arranged in sequence from left to right in the middle of the housing 1, an opening coil 5, a radial permanent magnet assembly 6 and a closing coil 7 arranged in sequence from left to right on the inner wall of the housing 1, and a valve sleeve assembly 8 located outside the housing 1; an iron core assembly is arranged between the inner middle of the housing 1 and the inner wall of the housing 1;

[0040] The armature assembly 3 includes an armature 31, a spring seat 331 located in the armature 31, a push rod 32 whose right end is located in the armature 31 and whose left end extends out of the armature 31 and penetrates the stopper 2, and a spring 33 whose right end is sleeved on the spring seat 331 and whose left end is connected to the right end of the push rod 32;

[0041] The valve sleeve assembly 8 includes a filter element assembly 82 and a base 81 from left to right, and a transmission rod 83 is located in the cavity of the base 81; an oil return port 811 is opened at the right end of the base 81; the oil return port 811 is connected to the left side of the cavity of the base 81 through a first orifice 812, and a first steel ball 841 is provided at the connection point; the right side of the cavity of the base 81 is connected to the filter element assembly 82 through a second orifice 813, and a second steel ball 842 is provided at the connection point; the filter element assembly 82 is provided with an oil supply port 821;

[0042] The left end of the push rod 32 is aligned with the right side of the first steel ball 841 .

[0043] The core assembly includes a first magnetic conductor 41, a magnetic isolation ring 42, and a second magnetic conductor 43. The first magnetic conductor 41 is located at the right end of the armature assembly 3, the magnetic isolation ring 42 is located between the armature 31 and the open coil 5, the radial permanent magnet assembly 6 and the closed coil 7, and the second magnetic conductor 43 is located between the stop iron 2 and the shell 1 and the open coil 5; the first magnetic conductor 41, the magnetic isolation ring 42, and the second magnetic conductor 43 are connected by laser welding.

[0044] The radial permanent magnet assembly 6 includes a holder 61 and a plurality of permanent magnets 62 evenly arranged in the holder 61 , wherein the S poles of the permanent magnets 62 face radially inward.

[0045] The spring seat 331 is fixed in the armature 31 via a cylindrical pin 34 .

[0046] A first mounting groove 311 is formed at the left end of the armature 31 , a retaining ring 35 is sleeved on the push rod 32 , and the retaining ring 35 is located in the first mounting groove 311 ; two second mounting grooves 312 are formed on the outer wall of the armature 31 , and a slip ring 36 with an oblique cut is located in the second mounting groove 312 .

[0047] The base 81 includes a first base 814 and a second base 815 located on the left side of the first base 814 . The first base 814 and the second base 815 are connected by laser welding. A control port 816 is provided at the connection between the first base 814 and the second base 815 .

[0048] The permanent magnet 62 is rectangular.

[0049] The stop iron 2 is connected to the first base 814 via a guide sleeve 9 .

[0050] A first sealing ring 101 is installed between the left end of the stop iron 2 and the second magnetic conductor 43; a second sealing ring 102 is arranged at the right end of the first base 814, and a third sealing ring 103 and a first protective ring 104 are arranged at the left end; a fourth sealing ring 105 and a second protective ring 106 are arranged on the second base 815.

[0051] In actual use, such as Figure 1 , Figure 2 and Figure 3 As shown, after the retaining ring 35 is installed in the first mounting groove 311 of the armature 31, the machine tool is closed and fixed, and then the push rod 32, the spring 33, and the spring seat 331 are placed in the hole of the armature 31 in sequence. After the spring 33 is pre-compressed, the spring seat 331 is fixed by the cylindrical pin 34, and finally the slip ring 36 with an oblique cut is placed in the two second mounting grooves 312 on the outer circumferential surface of the armature 31.

[0052] Due to the design requirements of high response of the self-locking solenoid valve and high reliability of self-locking after power failure, the design margin of the electromagnetic force and the permanent magnet magnetic attraction force needs to be relatively high. In this way, if the armature 31 and the push rod 32 are rigidly connected, the larger electromagnetic force and the permanent magnet magnetic attraction force will act directly on the first opening 812 of the first base 814 through the first steel ball 812. The first steel ball 812 is much stronger than the first base 814, which will inevitably cause the first opening 812 of the first base 814 to collapse, deform or wear after multiple impacts of the first steel ball 812, resulting in sealing failure.

[0053] The utility model designs a longer spring 33 inside the armature 31, obtains the required spring force after pre-compression, and transmits the force and displacement of the armature 32 to the first steel ball 812 through the spring 33, thereby realizing the opening and closing of the valve port. In the utility model, the force transmitted by the first steel ball 812 is equal to the spring force, and has nothing to do with the electromagnetic force and the magnetic attraction force of the permanent magnet on the armature 31, but at the same time inherits the same displacement of the armature 31, realizes the opening and closing of the valve port while avoiding the damage of the larger electromagnetic force and the magnetic attraction force of the permanent magnet to the first base 814. Therefore, the utility model can design the electromagnetic force and the magnetic attraction force of the permanent magnet to be very large to obtain a high response speed and high self-locking reliability. At the same time, since the spring 33 is placed in the armature 31, the size of the spring 33 can be designed to be longer to obtain a larger spring force, thereby adapting to higher pressures and valve port sealing forms with different structures.

[0054] The first base 814 and the second base 815 are connected by laser welding, and the filter element assembly 82 and the second base 815 are connected by machine tool closing; in the utility model, the first base 814 is used to realize an integrated design with the electromagnet part, and an external hexagonal profile of a certain length is designed on the distribution circumference of the oil return port 811 of the first base 814 as the installation structure of the valve sleeve assembly 8.

[0055] For a two-position self-locking solenoid valve, the prior art usually sets a section of magnetic conductor at the position of the permanent magnet in the core assembly, and the permanent magnet is located in the middle of the entire core assembly, so that it will be a "magnetic isolation ring-magnetic conductor-magnetic isolation ring" structure. Especially for a self-locking solenoid valve for hydraulic high pressure, due to the requirements of sealing and pressure resistance, the magnetic isolation ring and the magnetic conductor need to be welded and connected. At the same time, due to functional requirements, the magnetic isolation ring and the magnetic conductor are both thin-walled structures (thickness ≤ 1mm), so at least a three-section ("magnetic isolation ring-magnetic conductor-magnetic isolation ring") core assembly has certain difficulties in manufacturing process. In the utility model, a magnetic conductor is no longer set at the position of the permanent magnet, and the same magnetic performance requirements of the three-section core assembly are met by increasing the magnetic attraction of the permanent magnet and optimizing the magnetic circuit, which reduces the process difficulty of the two-position self-locking solenoid valve to a certain extent.

[0056] like Figure 4 and Figure 5 As shown, the length of the permanent magnet 62 is adapted to the width of the groove of the holder 61, and the permanent magnet 62 is bonded to the groove of the holder 61 with a heat-resistant adhesive, and the S poles of the permanent magnet 62 are evenly arranged in the holder 61 radially inward; for the self-locking solenoid valve, the single permanent magnet in the prior art is usually fan-shaped (such as Figure 6 As shown), the two magnetic poles are cylindrical in shape and are arranged in a tightly fitting manner, which has high requirements for permanent magnet processing and magnetization technology and poor manufacturability. The utility model designs a single permanent magnet 62 as a rectangle, which has high manufacturability.

[0057] Other parts not described belong to the prior art.

Claims

1. A high-pressure zero-leakage high-response double-position self-locking cartridge solenoid valve, characterized in that: It comprises a shell (1), a stopper (2) and an armature assembly (3) arranged in sequence from left to right in the middle of the shell (1), an opening coil (5), a radial permanent magnet assembly (6) and a closing coil (7) arranged in sequence from left to right on the inner wall of the shell (1), and a valve sleeve assembly (8) located outside the shell (1); an iron core assembly is arranged between the middle of the shell (1) and the inner wall of the shell (1); The armature assembly (3) comprises an armature (31), a spring seat (331) located in the armature (31), a push rod (32) with a right end located in the armature (31) and a left end extending out of the armature (31) and penetrating the stop iron (2), and a spring (33) with a right end sleeved on the spring seat (331) and a left end connected to the right end of the push rod (32); The valve sleeve assembly (8) comprises, from left to right, a filter element assembly (82) and a base (81), the transmission rod (83) being located in the cavity of the base (81); an oil return port (811) is provided at the right end of the base (81); the oil return port (811) is connected to the right side of the cavity of the base (81) through a first orifice (812), and a first steel ball (841) is provided at the connection point; the left side of the cavity of the base (81) is connected to the filter element assembly (82) through a second orifice (813), and a second steel ball (842) is provided at the connection point; The left end of the push rod (32) is aligned with the right side of the first steel ball (841); The core assembly comprises a first magnetic conductor (41), a magnetic shielding ring (42), and a second magnetic conductor (43); the first magnetic conductor (41) is located at the right end of the armature assembly (3); the magnetic shielding ring (42) is located between the armature (31) and the open coil (5), the radial permanent magnet assembly (6) and the closed coil (7); and the second magnetic conductor (43) is located between the stop iron (2) and the housing (1) and the open coil (5); the first magnetic conductor (41), the magnetic shielding ring (42), and the second magnetic conductor (43) are connected by laser welding.

2. A high-pressure zero-leakage high-response two-position self-locking cartridge solenoid valve according to claim 1, characterized in that: The radial permanent magnet assembly (6) comprises a retaining frame (61) and a plurality of permanent magnets (62) arranged evenly in the retaining frame (61), wherein the S poles of the permanent magnets (62) face radially inwards.

3. A high-pressure zero-leakage high-response two-position self-locking cartridge solenoid valve according to claim 2, characterized in that: The spring seat (331) is fixed in the armature (31) via a cylindrical pin (34).

4. A high-pressure zero-leakage high-response two-position self-locking cartridge solenoid valve according to claim 3, characterized in that: The left end of the armature (31) is provided with a first mounting groove (311), the top rod (32) is sleeved with a retaining ring (35), and the retaining ring (35) is located in the first mounting groove (311); the outer wall of the armature (31) is provided with two second mounting grooves (312), and a slip ring (36) with an oblique cut is located in the second mounting groove (312).

5. A high-pressure zero-leakage high-response two-position self-locking cartridge solenoid valve according to claim 4, characterized in that: The base (81) comprises a first base (814) and a second base (815) located on the left side of the first base (814); the first base (814) and the second base (815) are connected by laser welding; and a control port (816) is provided at the connection between the first base (814) and the second base (815).

6. A high-pressure zero-leakage high-response two-position self-locking cartridge solenoid valve according to claim 5, characterized in that: The permanent magnet (62) is rectangular.

7. A high-pressure zero-leakage high-response two-position self-locking cartridge solenoid valve according to claim 6, characterized in that: The stop iron (2) is connected to the first base (814) via a guide sleeve (9).

8. A high-pressure zero-leakage high-response two-position self-locking cartridge solenoid valve according to claim 7, characterized in that: A first sealing ring (101) is installed between the left end of the stop iron (2) and the second magnetic conductor (43); a second sealing ring (102) is arranged at the right end of the first base (814), and a third sealing ring (103) and a first protective ring (104) are arranged at the left end; and a fourth sealing ring (105) and a second protective ring (106) are arranged on the second base (815).

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