Solenoid valve with buffering function, reverse sealing function and adjustable flow

Abstract

The invention provides an electromagnetic valve with a buffering function and a reverse sealing function. Comprising a shell, a load-reducing valve part, a main valve part and a reverse sealing part, two open ends of the shell are inwards provided with two cavities, and the bottom of the two cavities is communicated with the cross sections of the two cavities in a smaller area; the main valve part and the reverse sealing part are respectively arranged in the two cavities, and when a medium is not introduced, the main valve part and the reverse sealing part are pressed on the two sides of the common bottom through the pressing force of the main valve part and the reverse sealing part and can axially move in the cavities along the shell under the action of the medium force; according to the valve capable of being sealed in the reverse direction, opening and closing actions are conducted according to instructions to supply and cut off high-pressure gas during forward flowing, and high-temperature gas is sealed in the reverse direction after starting.

Description

Technical Field

[0001] The present invention relates to a valve which can open and close the valve by turning on and off the power to an electromagnet, and can be applied to high-tech fields such as aerospace and aviation, and also has very broad application prospects in civil industrial production activities. Background Art

[0002] Liquid oxygen-methane engines have the advantages of reusability, thrust adjustment and mixture ratio adjustment capabilities, multiple starts and health monitoring. According to system requirements, the engine is equipped with a solenoid valve, with the inlet connected to the gas cylinder and the outlet connected to the turbine. Its function is to open and close according to instructions to supply and cut off high-pressure starting gas, and reverse seal the high-temperature gas after normal start. The existing engine uses a gas generator to ignite first, and the generated gas blows the turbine to rotate, and the system is relatively complex. Summary of the invention

[0003] The technical problem solved by the invention is to provide a solenoid valve with a buffer function, capable of reverse sealing and adjustable flow.

[0004] The technical solution of the present invention is: a solenoid valve with a buffer function, capable of reverse sealing and adjustable flow, comprising a housing, a load-reducing valve part, a main valve part and a reverse sealing part;

[0005] Two cavities are arranged inwardly at the two opening ends of the shell, and the common bottom of the two cavities is connected with a smaller area relative to the cross-section of the two cavities; the main valve part and the reverse sealing part are respectively installed in the two cavities, and when no medium is introduced, the main valve part and the reverse sealing part are pressed on both sides of the common bottom by their own pressing force, and can move along the axial direction of the shell in the cavity under the action of the medium force;

[0006] The cavity where the main valve part is located is recorded as the valve inner cavity. The bottom side wall of the valve inner cavity is provided with an inlet and a load-reducing valve cavity connected thereto. The load-reducing valve part is installed in the load-reducing valve cavity. An electromagnet is installed on the upper part of the load-reducing valve part. The load-reducing valve part forms an upper valve and a lower valve in the load-reducing valve cavity. An end cover is installed at the outer end of the valve inner cavity, and a back pressure cavity is formed between the main valve part and the end cover. The back pressure cavity is connected with the load-reducing valve cavity through an internal channel of the shell.

[0007] The medium gas enters the inner cavity of the valve from the inlet, and the medium pressure enters the back pressure cavity through the unloading valve cavity to provide a pressing force toward the bottom for the main valve part. The unloading valve part keeps the upper valve sealed under the action of the medium pressure and its own pressing force, the lower valve opens, and the solenoid valve is closed;

[0008] After the electromagnet is energized, it pushes the unloading valve part to move downward, the lower valve is sealed, the upper valve opens, the shell is pressed and a seal is formed, the medium in the back pressure chamber is discharged through the upper end channel of the unloading valve chamber, and the main valve part moves toward the back pressure chamber under the action of the medium pressure on one side of the bottom of the inner cavity of the valve, the connecting channel at the common bottom of the two chambers opens, the pressure acts on the reverse sealing part, pushing it to move, and the medium enters the downstream pipeline;

[0009] After the electromagnet is powered off, the upper valve is sealed again, and the medium is filled into the back pressure chamber again. The main valve part presses one side of the common bottom under the combined action of the medium pressure and its own clamping force, closing the connecting channel at the common bottom of the two chambers. The reverse sealing part forms a seal with the end face of the common bottom under the action of its own clamping force and the downstream pressure, ensuring that the downstream medium will not flow back to the inlet.

[0010] Preferably, the main valve part includes a main valve, a main spring, and a buffer pad; the main valve is installed in a cavity on one side and is sealed with the inner wall of the cavity by a sealing ring, and the sealing ring ensures the seal to prevent the medium at the left end of the main valve from entering the back pressure cavity on the right side; an end cover is fixed at the outer end of the cavity, and a back pressure cavity is formed between the end cover and the main valve, the main spring is installed in the back pressure cavity to press the main spring against the bottom of the cavity, and the buffer pad is installed on the end cover to buffer the pressure when the main valve touches the end cover.

[0011] Preferably, the main valve is made of stainless steel, and the end cover and the housing are connected using self-locking nuts and studs.

[0012] Preferably, the load-reducing valve part comprises a load-reducing spring, a load-reducing valve, and a load-reducing valve seat;

[0013] The unloading valve is installed in the unloading valve cavity, a unloading spring is installed between it and the bottom of the unloading valve cavity, a unloading valve seat is installed on the upper end of the unloading valve, and the electromagnet is installed on the unloading valve seat. When the solenoid valve is powered off, under the action of the medium and the spring force, the upper valve of the unloading valve is pressed on the unloading valve seat; when the solenoid valve is powered on, the electromagnetic suction force overcomes the medium force and the spring force, and the lower valve of the unloading valve is pressed on the unloading valve seat of the shell.

[0014] Preferably, an oblique long thin hole with an angle of 20° is provided between the back pressure chamber and the load-reducing valve chamber; the diameter of the hole is larger than the diameter of the lower valve seat.

[0015] Preferably, the reverse sealing part includes a one-way valve core, a one-way valve core spring, and a buffer pad;

[0016] The one-way valve core is installed in a cavity in the shell body opposite to the inner cavity of the valve, and a connecting flange is installed at the outer end of the cavity to form an outlet with the connecting flange; one end of the one-way valve core is a plane for contacting with the common bottom side to achieve channel sealing, and the one-way valve core spring is installed at the other end of the one-way valve core directly connected to the connecting flange, and a buffer pad is installed on the end face of the connecting flange to buffer the pressure when the one-way valve core touches the connecting flange.

[0017] Preferably, the buffer pad adopts an embedded non-metallic buffer structure.

[0018] Preferably, the one-way valve core is made of stainless steel, and the connecting flange and the housing are connected using self-locking nuts and studs.

[0019] Preferably, the flow limiting channel in the one-way valve core is composed of multiple flow limiting holes, and the equivalent area of ​​all apertures is smaller than the cross-sectional area of ​​the common bottom connection; after the main valve of the solenoid valve is opened, the medium pressure overcomes the one-way valve core spring assembly force to open the one-way valve core, and the medium passes through the valve seat and flows from the flow limiting hole to the outlet.

[0020] Preferably, the valve housing is made of TC4 and the valve core is made of stainless steel.

[0021] The beneficial effects of the present invention compared with the prior art are:

[0022] (1) Different inflation rate requirements can be achieved by replacing the throttling structure.

[0023] (2) It can ensure long service life under high pressure of 23MPa without causing valve core deformation due to impact.

[0024] (3) In flange connection, high-temperature self-locking nuts are used to effectively prevent loosening.

[0025] (4) Bolts use high-strength rolled bolts to improve strength and fatigue resistance.

[0026] (5) The guide and sealing seat of the main valve core and the one-way valve core are all on the same housing, with good processing technology and easy to ensure sealing performance. The three valve cores can be disassembled and assembled separately, and the disassembly and assembly is relatively good. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] In the figure: 1 electromagnet 2 O-ring 3 cover 4 main valve 5 main spring 6 one-way valve core 7 one-way valve core spring 8 connecting flange 9 housing 10 load-reducing spring 11 load-reducing valve 12 load-reducing valve seat 13 buffer pad. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the embodiments.

[0030] like Figure 1 As shown, the present invention is a solenoid valve structure, the inlet is connected to the gas cylinder, the outlet is connected to the turbine, the function is to open and close according to the command to supply and cut off the high-pressure starting gas, and to reverse seal the high-temperature gas after normal starting. The working pressure is 1-23MPa, the reverse sealing pressure is 211.4MPa, and the DC voltage of the electromagnet is Can realize remote control.

[0031] Attached Figure 1 The structure of the present invention includes an electromagnet 1, an O-ring 2, a cover 3, a main valve 4, a main spring 5, a one-way valve core 6, a one-way valve core spring 7, a connecting flange 8, a housing 9, a load-reducing spring 10, a load-reducing valve 11, a load-reducing valve seat 12, and a buffer pad 13. The entire electromagnetic valve is mainly composed of three parts: a load-reducing valve part controlled by electromagnetic force, a main valve part, and a reverse sealing part. The load-reducing valve part of the electromagnetic valve includes a load-reducing spring 10, a load-reducing valve 11, a load-reducing valve seat 12, etc., the main valve part includes an O-ring 2, a main valve 4, a main spring 5, a buffer pad 13, etc., and the reverse sealing part includes a one-way valve core 6, a one-way valve core spring 7, and a buffer pad 13. The main valve 4 is located in the housing 9 and is pressed against the housing 9 by the main spring 5. The load-reducing valve 11 is located in the housing 9 and is pressed against the housing 9 by the load-reducing spring 10. The one-way valve core 7 is located in the housing 9 and is pressed against the housing 9 by the one-way valve core spring 7. Helium enters the valve cavity from below, and the medium pressure enters the back pressure cavity on the right side of the main valve through the load-reducing valve cavity and presses the main valve 4 together with the spring force. The load-reducing valve 11 keeps the upper valve sealed under the action of the medium pressure and the spring force, the lower valve is opened, and the solenoid valve is closed. After the electromagnet is energized with a DC voltage of 22V to 30V, the electromagnet 1 is attracted downward, pushing the unloading valve 11 downward, and then the lower valve is sealed, the upper valve is opened, pressing the shell 9 and forming a seal, and the helium in the back pressure chamber on the right side of the main valve 4 is discharged through the upper end channel of the unloading valve 11. The main valve 4 moves to the right under the pressure of the medium on its left side, and the O-ring 2 can ensure the seal and prevent the medium on the left end of the main valve 4 from entering the back pressure chamber on the right side. At this time, the channel between the main valve 4 and the shell 9 leading to the downstream gas cylinder is opened, and the pressure acts on the right side of the one-way valve core 7, pushing it to move to the left, hitting the buffer pad 13, and the medium enters the downstream pipeline.

[0032] After starting, the solenoid valve is powered off, and the electromagnet 1 no longer generates suction. Under the combined action of the medium pressure and the spring force, the unloading valve 11 moves upward, the upper valve is sealed again, and the medium is again filled into the back pressure chamber on the right side of the main valve. The main valve 4 moves to the left under the combined action of the medium pressure and the main spring, closing the channel for the medium to inflate downstream. The one-way valve core 6 moves to the right under the action of the one-way valve core spring 8 and the downstream pressure to form a seal with the left end sealing surface of the housing 9, ensuring that the downstream medium will not flow back to the inlet.

[0033] Due to the high working medium pressure (23MPa), the main valve and the one-way valve core are made of stainless steel. To enhance the flange connection strength, they are connected with self-locking nuts and high-strength studs. In order to prevent the valve from deforming easily under impact and causing the valve core to get stuck, an embedded non-metallic buffer structure is used in the design. When the main valve 4 is opened and the one-way valve core 6 is opened, they collide with the cover and the connecting flange 8 and stop, which plays a buffering role to prevent the valve core from being impacted and roughened under high pressure, causing it to get stuck.

[0034] The flow limiting channel in the one-way valve core 6 of the present invention is composed of four φ12 holes. After the main valve of the solenoid valve is opened, the medium pressure overcomes the assembly force of the one-way valve core spring to open the one-way valve core. After the medium passes through the valve seat, it flows to the outlet from the four φ12 flow limiting holes. The design can improve the flow limiting channel according to the specific occasion of use, and can be serialized by installing flow limiting screws, and select screws with different hole diameters for flow limiting.

[0035] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0036] Parts not described in detail in the present invention belong to common knowledge of those skilled in the art.

Claims

1. A solenoid valve with a buffer function, reverse sealing and adjustable flow, characterized in that: It includes a housing, a load-reducing valve part, a main valve part and a reverse sealing part; Two cavities are arranged inwardly at the two opening ends of the shell, and the common bottom of the two cavities is connected with a smaller area relative to the cross-section of the two cavities; the main valve part and the reverse sealing part are respectively installed in the two cavities, and when no medium is introduced, the main valve part and the reverse sealing part are pressed on both sides of the common bottom by their own pressing force, and can move along the axial direction of the shell in the cavity under the action of the medium force; The cavity where the main valve part is located is recorded as the valve inner cavity. The bottom side wall of the valve inner cavity is provided with an inlet and a load-reducing valve cavity connected thereto. The load-reducing valve part is installed in the load-reducing valve cavity. An electromagnet is installed on the upper part of the load-reducing valve part. The load-reducing valve part forms an upper valve and a lower valve in the load-reducing valve cavity. An end cover is installed at the outer end of the valve inner cavity, and a back pressure cavity is formed between the main valve part and the end cover. The back pressure cavity is connected with the load-reducing valve cavity through an internal channel of the shell. The medium gas enters the inner cavity of the valve from the inlet, and the medium pressure enters the back pressure cavity through the unloading valve cavity to provide a pressing force toward the bottom for the main valve part. The unloading valve part keeps the upper valve sealed under the action of the medium pressure and its own pressing force, the lower valve opens, and the solenoid valve is closed; After the electromagnet is energized, it pushes the unloading valve part to move downward, the lower valve is sealed, the upper valve opens, the shell is pressed and a seal is formed, the medium in the back pressure chamber is discharged through the upper end channel of the unloading valve chamber, and the main valve part moves toward the back pressure chamber under the action of the medium pressure on one side of the bottom of the inner cavity of the valve, the connecting channel at the common bottom of the two chambers opens, the pressure acts on the reverse sealing part, pushing it to move, and the medium enters the downstream pipeline; After the electromagnet is powered off, the upper valve is sealed again, and the medium is filled into the back pressure chamber again. The main valve part presses one side of the common bottom under the combined action of the medium pressure and its own clamping force, closing the connecting channel at the common bottom of the two chambers. The reverse sealing part forms a seal with the end face of the common bottom under the action of its own clamping force and the downstream pressure, ensuring that the downstream medium will not flow back to the inlet.

2. The solenoid valve according to claim 1, characterized in that: The main valve part includes a main valve, a main spring and a buffer pad; The main valve is installed in a cavity on one side and is sealed with the inner wall of the cavity by a sealing ring. The sealing ring ensures the seal to prevent the medium at the left end of the main valve from entering the back pressure cavity on the right side. An end cover is fixed at the outer end of the cavity. A back pressure cavity is formed between the end cover and the main valve. A main spring is installed in the back pressure cavity to press the main spring against the bottom of the cavity. A buffer pad is installed on the end cover to buffer the pressure when the main valve touches the end cover.

3. The solenoid valve according to claim 2, characterized in that: The main valve is made of stainless steel, and the end cover and the shell are connected by self-locking nuts and studs.

4. The solenoid valve according to claim 1, characterized in that: The load-reducing valve part comprises a load-reducing spring, a load-reducing valve and a load-reducing valve seat; The unloading valve is installed in the unloading valve cavity, a unloading spring is installed between it and the bottom of the unloading valve cavity, a unloading valve seat is installed on the upper end of the unloading valve, and the electromagnet is installed on the unloading valve seat. When the solenoid valve is powered off, under the action of the medium and the spring force, the upper valve of the unloading valve is pressed on the unloading valve seat; when the solenoid valve is powered on, the electromagnetic suction force overcomes the medium force and the spring force, and the lower valve of the unloading valve is pressed on the unloading valve seat of the shell.

5. The solenoid valve according to claim 4, characterized in that: An oblique fine hole is arranged between the back pressure cavity and the load-reducing valve cavity; the diameter of the hole is larger than the diameter of the lower valve seat.

6. The solenoid valve according to claim 1, characterized in that: The reverse sealing part includes a one-way valve core, a one-way valve core spring, and a buffer pad; The one-way valve core is installed in a cavity in the shell body opposite to the inner cavity of the valve, and a connecting flange is installed at the outer end of the cavity to form an outlet with the connecting flange; one end of the one-way valve core is a plane for contacting with the common bottom side to achieve channel sealing, and the one-way valve core spring is installed at the other end of the one-way valve core directly connected to the connecting flange, and a buffer pad is installed on the end face of the connecting flange to buffer the pressure when the one-way valve core touches the connecting flange.

7. The solenoid valve according to claim 2 or 6, characterized in that: The buffer pad adopts an embedded non-metal buffer structure.

8. The solenoid valve according to claim 6, characterized in that: The one-way valve core is made of stainless steel, and the connecting flange and the housing are connected by using self-locking nuts and studs.

9. The solenoid valve according to claim 1, characterized in that: The flow limiting channel in the one-way valve core is composed of multiple flow limiting holes, and the equivalent area of ​​all hole diameters is smaller than the cross-sectional area of ​​the common bottom connection; after the main valve of the solenoid valve is opened, the medium pressure overcomes the one-way valve core spring assembly force to open the one-way valve core, and the medium passes through the valve seat and flows from the flow limiting hole to the outlet.

10. The solenoid valve according to claim 4, characterized in that: The housing is TC4 and the valve core is stainless steel.

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