Static brake electromagnetic valve with high anti-pollution capacity

Abstract

The utility model provides a static brake electromagnetic valve with high anti-pollution capacity. The electromagnetic valve comprises an electromagnet unit, a pilot control unit, a shell assembly and a main valve combination unit. The pilot control unit comprises a pilot valve; wherein an oil filter assembly is arranged at a pressure oil inlet of the pilot valve, and the oil filter assembly is used for preventing foreign matters from entering an inner cavity of the pilot valve, so that abnormal opening or closing of the pilot valve is avoided; the pilot-operated type two-position three-way electromagnetic valve for the static brake system is good in anti-pollution capacity and controllable in inner leakage amount.

Description

Technical Field

[0001] The present application belongs to the field of aviation hydraulic design technology, and in particular relates to a static brake solenoid valve with high anti-pollution capability. Background Art

[0002] At present, the static brake solenoid valves of aircraft hydraulic systems mostly use direct-acting two-position three-way solenoid valves. This type of solenoid valve has a short valve stroke and large fluid resistance, and requires a large electromagnet thrust. The internal sealing mainly depends on the fit clearance between the cylindrical sliding valve core and the bushing. If the fit clearance is small, the valve core may be hydraulically clamped and unable to move under high-pressure conditions due to its shape error, resulting in the product being unable to switch normally, that is, the product has poor pollution resistance. Utility Model Content

[0003] In response to the above technical problems, the present application provides a static brake system solenoid valve with good anti-pollution ability and controllable internal leakage.

[0004] The present application provides a static brake solenoid valve with high anti-pollution capability, the solenoid valve comprising an electromagnet unit, a pilot control unit, a housing assembly and a main valve assembly unit; the pilot control unit comprises a pilot valve;

[0005] Among them, an oil filter assembly is installed at the pressure oil inlet of the pilot valve, and the oil filter assembly is used to prevent foreign matter from entering the inner cavity of the pilot valve, thereby avoiding abnormal opening or closing of the pilot valve.

[0006] Preferably, the fitting clearance between the valve cylindrical surface and the inner hole of the positioning sleeve of the main valve assembly unit adopts standard tolerance fitting, and a sliding ring combination seal is adopted between the valve guide rod and the positioning sleeve.

[0007] Preferably, the pilot control unit further includes a left valve seat, a steel ball, a positioning sleeve, a right valve seat, an oil filter assembly, an adjusting gasket, an elastic gasket, a sealing ring, a protective ring and a plug.

[0008] Preferably, the main valve assembly unit further includes a positioning seat, a spring, a spring seat, a guide sleeve, a valve seat and a bushing.

[0009] Preferably, the main valve assembly unit adopts a cylindrical guide and cone valve sealing structure.

[0010] Preferably, the shell assembly consists of an end cover, a nozzle, an adapter, and a socket.

[0011] Beneficial technical effects of this application:

[0012] The solenoid valve provided in the present application has an oil filter assembly added to the interior of the pilot valve, which improves the valve's anti-pollution ability. The oil filter assembly is small in size and light in weight, and has little effect on the overall volume and weight of the solenoid valve. The main valve adopts a cylindrical guide and conical valve sealing structure, which overcomes the shortcomings of the cylindrical sliding valve, such as large conversion force, easy jamming, poor anti-pollution ability, and uncontrollable internal leakage. When the weight and volume of the solenoid valve change slightly, the problem of the aircraft takeoff line static brake being unable to be released due to the poor anti-pollution ability of the solenoid valve is solved, and the use requirements of the static brake function of medium-sized transport aircraft are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the product structure diagram of the solenoid valve;

[0014] Figure 2 It is the structure diagram of the electromagnet unit;

[0015] Figure 3 This is the structural diagram of the pilot control unit;

[0016] Figure 4 This is the main valve unit structure diagram;

[0017] Figure 5 It is the structural diagram of the shell unit;

[0018] Figure 6 It is the structural diagram of the shell unit;

[0019] Figure 7 This is the schematic diagram of the electromagnet in the power-off state;

[0020] Figure 8 This is the schematic diagram of the electromagnet in the energized state;

[0021] Wherein: 1-electromagnet unit, 2-pilot control unit, 3-housing unit, 4-main valve unit, 5-jacket, 6-armature, 7-coil assembly, 8-iron core, 9-push rod, 10-left valve seat, 11-positioning sleeve, 12-right valve seat, 13-oil filter assembly, 14-blocking, 15-steel ball, 16-positioning seat, 17-first spring, 18-spring seat, 19-first valve, 20-guide sleeve, 21-first valve seat, 22-bushing, 23-second valve seat, 24-sealing ring, 25-socket, 26-adapter seat, 27-end cover, 28-housing assembly, 29-steel ball, 30-push rod, 31-second spring, 32-third valve, 33-steel ball, 34-push rod, 35-third spring, 36-second valve. DETAILED DESCRIPTION

[0022] See also Figure 1-Figure 8 The static brake solenoid valve provided in this application is composed of an electromagnet unit, a pilot control unit, a housing assembly and a main valve combination unit. Figure 1 shown.

[0023] The electromagnet unit consists of a jacket, a coil assembly, an armature, an iron core, and a push rod. The jacket, coil assembly, armature, and iron core form a magnetic field circuit, and the air gap is between the armature and the iron core. When the power is turned on, the electromagnet attracts the armature to the iron core and pushes the push rod to output thrust and displacement. Its structure is as follows: Figure 2 As shown. The electromagnet adopts a wet electromagnet structure. The working medium can enter the inner cavity of the coil frame. The working medium cools the heat generated by the electromagnetic coil and lubricates the moving parts (such as the armature and the ejector rod). The electromagnet is connected to the housing through the threads on the outer sleeve.

[0024] The pilot control unit consists of a left valve seat, a steel ball, a positioning sleeve, a right valve seat, an oil filter assembly, an adjustment washer, an elastic washer, a sealing ring, a protective ring, and a plug. The steel ball is a valve, and it switches the pressure of the pressure chamber at both ends of the valve between high and low according to the thrust of the electromagnet with the left and right valve seats; the positioning sleeve is used to position the steel ball; the oil filter assembly is used to prevent the influence of foreign matter and improve the product's anti-pollution ability; the elastic washer is used to eliminate the gap between parts to ensure the function and performance of the pilot unit. Its structure is as follows: Figure 3 The valve of the pilot part is a steel ball valve, which has good sealing performance and small valve opening, and can effectively reduce the volume and weight of the electromagnet part.

[0025] The main valve unit is composed of a positioning seat, a spring, a spring seat, a sealing ring, a protective ring, a valve, a guide sleeve, a valve seat, and a bushing. The positioning seat is used to limit the position of the spring; the valve moves between the left and right valve seats of the bushing to achieve the conversion of the oil circuit; the spring is used to reset the valve; the spring seat is used to support the spring, and its structure is as follows: Figure 3 shown.

[0026] Among them, there are 4 grooves with a width of 4 and a depth of 2.2 on the end surface of the valve seat (2 places), and 6 Φ3 oil holes are evenly distributed on the outer circle of the bushing. The left and right valve seats are connected to the return oil port O and the high-pressure oil port P respectively, and the holes on the outer circle of the bushing are connected to the working oil port A. O-shaped rubber rings are used to seal and isolate between each annular groove of the bushing, and a plastic protective ring is installed on its low-pressure side to prevent the O-shaped rubber ring from squeezing into the gap under pressure and being damaged. O-shaped rubber rings are used to seal and isolate between the two valve seats and the bushing.

[0027] The valve is installed in the bushing hole and sealed with the valve seat through the cone surface to control and switch the oil circuit. The outer circle of the valve adopts a combined sealing structure to reduce internal leakage.

[0028] The housing unit consists of an end cap, a sealing ring, a protective ring, a housing assembly, a nozzle, an adapter, a socket, etc. The housing assembly provides protection for the internal parts and provides an interface with the body; the sealing ring is used to prevent leakage; the nozzle is the interface between the product and the system oil circuit; the protective ring is used to prevent the sealing ring from being squeezed into the gap and damaged under high pressure; the socket provides an interface between the product and the power supply system. Its structure is as follows: Figure 5 As shown: the shell part is used as an interface carrier connected to the system, and its mounting interface is designed as a lug, which is installed on the body by bolts. This form is easy to install and has good maintainability. No special installation tools are required, and the lug structure is simple and light. The electrical connector is fixed to the adapter by 4 screws. The nozzle connected to the oil circuit is connected to the shell by threads. All external sealing points on the shell are in the form of sealing rings, protective rings and sealing steps.

[0029] In one possible implementation, the electromagnet is de-energized.

[0030] Electromagnet power-off state (such as Figure 7 As shown), the hydraulic pressure presses the steel ball valve 1 tightly against the left valve seat, and the high-pressure oil flows along the hole into the inner cavity at both ends of the valve 4, making the pressure in the inner cavity at both ends of the valve 4 equal. The valve 4 is kept in the right limit position under the action of the spring 3. At this time, the P port is closed, and the oil circuit from the A port to the O port is connected.

[0031] In another possible implementation, the electromagnet is energized

[0032] Electromagnet power-on status (such as Figure 8 As shown in the figure, its armature pushes the push rod 2 to the right under the action of electromagnetic force, presses the steel ball valve 1 against the right valve seat, cuts off the high-pressure oil circuit from the pump port P to the inner cavity of the left end of the valve 4, and connects the inner cavity of the left end of the valve 4 with the return oil circuit O. Under the action of the liquid pressure at the right end, the valve 4 overcomes the elastic force of the spring 3 and moves to the left to the stop position, cutting off the oil circuit from the O port to the A port, and connecting the oil circuit from the P port to the A port.

Claims

1. A static brake solenoid valve with high anti-pollution ability, characterized in that: The solenoid valve comprises an electromagnet unit, a pilot control unit, a housing assembly and a main valve assembly unit; the pilot control unit comprises a pilot valve; Among them, an oil filter assembly is installed at the pressure oil inlet of the pilot valve, and the oil filter assembly is used to prevent foreign matter from entering the inner cavity of the pilot valve, thereby avoiding abnormal opening or closing of the pilot valve.

2. The solenoid valve according to claim 1, characterized in that: The matching clearance between the valve cylindrical surface of the main valve combination unit and the inner hole of the positioning sleeve adopts standard tolerance matching, and a sliding ring combination seal is adopted between the valve guide rod and the positioning sleeve.

3. The solenoid valve according to claim 2, characterized in that: The pilot control unit also includes a left valve seat, a steel ball, a positioning sleeve, a right valve seat, an oil filter assembly, an adjusting gasket, an elastic gasket, a sealing ring, a protective ring and a plug.

4. The solenoid valve according to claim 3, characterized in that: The main valve assembly unit also includes a positioning seat, a spring, a spring seat, a guide sleeve, a valve seat and a bushing.

5. The solenoid valve according to claim 4, characterized in that: The main valve combination unit adopts a cylindrical guide and a cone valve sealing structure.

6. The solenoid valve according to claim 1, characterized in that: The shell assembly consists of an end cover, a nozzle, an adapter and a socket.

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