Remote control pressure regulating valve

Abstract

The application provides a remote control pressure regulating valve which is compact in structure and can work in harsh environment and accurately control spring pre-tightening force. The remote control pressure regulating valve comprises a stepping motor, a valve body, a guide cylinder, a pressure regulating spring, a valve core and a valve seat; the guide cylinder, the pressure regulating spring, the valve core and the valve seat are sequentially assembled in the valve body; after external fuel enters the valve seat, the sealing of the valve core to the valve seat further increases the fuel pressure, the fuel pressure acts on the bottom of the valve core and is transmitted to the pressure regulating spring; when the fuel pressure exceeds the pre-tightening force of the pressure regulating spring, the valve core releases the sealing to the valve seat, and the fuel is discharged outward; the stepping motor receives external pulse signals through a motor signal connector and positively or reversely rotates according to the external pulse signals, so as to drive the guide cylinder to move, thereby adjusting the pre-tightening force of the pressure regulating spring and realizing accurate control of the fuel pressure.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic technology and mainly relates to a remote control pressure regulating valve. Background Technology

[0002] Existing hydraulic devices require a separate hydraulic station for oil supply, resulting in a complex device structure and low space utilization. Furthermore, using a drive motor for control poses a high risk in flammable and explosive environments where combustible gases can be ignited, and it is impossible to accurately control the device pressure. Summary of the Invention

[0003] Based on the above shortcomings, a pressure regulating valve controlled by a stepper explosion-proof motor is designed. It has a compact structure and can work in harsh environments, accurately controlling the spring preload.

[0004] The technical solution of this utility model is as follows: A remote-controlled pressure regulating valve includes a stepper motor, a valve body, a guide cylinder, a pressure regulating spring, a valve core, and a valve seat; The guide tube, pressure regulating spring, valve core and valve seat are assembled in sequence in the valve body; After external fuel enters the valve seat, the valve core seals the valve seat, causing the fuel pressure to increase further. The fuel pressure acts on the bottom of the valve core and is transmitted to the pressure regulating spring. When the fuel pressure exceeds the preload of the pressure regulating spring, the valve core releases the seal on the valve seat, and the fuel is discharged outward. The stepper motor receives external pulse signals through the motor signal connector and rotates forward or backward according to the external pulse signals to drive the guide cylinder to move, thereby adjusting the preload of the pressure regulating spring and achieving precise control of fuel pressure.

[0005] Preferably, the valve seat has an elongated orifice for regulating the pressure of external fuel.

[0006] Preferably, the remote-controlled pressure regulating valve further includes: an oil inlet connector and an oil outlet connector connected to the valve body; The fuel inlet connector is used to introduce external fuel into the valve seat; The oil outlet connector is used to discharge the pressurized fuel in the valve seat when the valve core is opened.

[0007] Preferably, the remote control pressure regulating valve further includes: an oil fitting connected to the valve body, the oil fitting being used to supply lubricating oil to the valve core.

[0008] Preferably, the remote-controlled pressure regulating valve further includes: a support plate, an end cap, and an adapter; The stepper motor is fixed on the support plate, and the support plate, end cover and valve body are connected as a whole by screws and nuts; The drive shaft of the stepper motor passes through the support plate and connects to the adapter. The other end of the adapter passes through the end cover and contacts the guide cylinder.

[0009] Preferably, the adapter is screwed to the end cap.

[0010] Preferably, the screws and nuts are in two sets, wherein the two nuts have different directions of rotation.

[0011] Preferably, the stepper motor is an explosion-proof stepper motor.

[0012] Preferably, the remote-controlled pressure regulating valve is used for pressure regulation of methanol, ammonia, natural gas, or hydrogen.

[0013] The beneficial effects of this utility model are as follows: External fuel enters the valve seat through the inlet connector. After initial pressure stabilization through the elongated orifice of the valve seat, it pushes the valve core. The pressure regulating spring dynamically balances the preload with the fuel pressure, controlling the valve core's sealing and depressurization. A stepper motor receives pulse signals, driving the adapter and guide cylinder to adjust the spring preload, achieving remote and precise pressure control. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the remote control pressure regulating valve in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the remote control pressure regulating valve in the embodiments of this application. Detailed Implementation

[0015] This application provides a remote control pressure regulating valve, which is used to regulate the pressure of fuel in the common rail as needed. The fuel in the common rail can be methanol, ammonia, natural gas or hydrogen, etc.

[0016] Reference Figure 1 and Figure 2 The remote control pressure regulating valve includes: a stepper motor 1, a valve body 6, a guide cylinder 15, a pressure regulating spring 14, a valve core 13, and a valve seat 12. The guide cylinder 15, the pressure regulating spring 14, and the valve core are sequentially assembled inside the valve body 6.

[0017] The guide cylinder 15 is provided with an inner boss, which can center the pressure regulating spring 14 and reduce the side slippage of the pressure regulating spring 14 under high pressure conditions, thereby affecting the accuracy of the device.

[0018] When the fuel in the common rail system is a flammable medium such as methanol, stepper motor 1 can be designed as an explosion-proof stepper motor. The use of an explosion-proof stepper motor avoids the risk of explosion caused by electrical sparks or overheating. Its design complies with ATEX / IECEx explosion-proof standards and is suitable for flammable and explosive environments such as chemical plants and ships, significantly improving system safety. The explosion-proof stepper motor 1 adopts a fully enclosed structure, and its interior may be filled with an inert gas (such as nitrogen) or use an explosion-proof housing to ensure complete isolation of components such as brushes and windings that may generate sparks from the external flammable environment. At the same time, the motor temperature rise is limited to T4 level (surface temperature ≤135°C) to prevent ignition of methanol vapor (flash point approximately 11°C).

[0019] By precisely controlling the step angle of stepper motor 1 (or an explosion-proof stepper motor) (e.g., 1.8° step angle, 200 steps / revolution), micron-level adjustment of fuel pressure can be achieved. This precision meets the high stability requirements of common rail systems for fuel pressure (e.g., controlling the injection pressure of diesel or methanol fuel within ±0.2 MPa), ensuring optimal engine combustion efficiency while reducing emissions.

[0020] Under the preload of the pressure regulating spring 14, the valve core 13 forms a seal with the valve seat 12, and fuel continues to accumulate in the sealing cavity of the valve seat 12, causing the pressure to rise linearly.

[0021] After the fuel in the common rail enters the valve seat 12, the seal of the valve core 13 on the valve seat 12 further increases the fuel pressure. The fuel pressure acts on the bottom of the valve core 13 and is transmitted to the pressure regulating spring 14. When the fuel pressure exceeds the preload of the pressure regulating spring 14, the valve core 13 releases the seal on the valve seat 12, and the pressurized fuel is discharged outward. When the fuel pressure exceeds the preload of the pressure regulating spring 14, the valve core 13 is pushed up, the seal of the valve core 13 on the valve seat 12 is released, the fuel can be discharged quickly, the pressure drops back to below the set threshold, and the valve core 13 reseals, forming a closed-loop control.

[0022] The stepper motor 1 receives external pulse signals through the motor signal connector 11 and rotates forward or backward according to the external pulse signals to drive the guide cylinder 15 to move, thereby adjusting the preload of the pressure regulating spring 14 and achieving precise control of fuel pressure.

[0023] The preload of the pressure regulating spring 14 is adjusted in real time through the linear displacement of the guide cylinder 15. Combined with the sealing and pressure relief actions of the valve core 13, it can respond to pressure fluctuations within milliseconds. For example, when the common rail pressure suddenly drops due to fuel injection, the stepper motor 1 increases the spring preload by reversing, quickly restoring the target pressure value and avoiding the impact of pressure oscillations on the injection system.

[0024] An external controller sends pulse signals (e.g., frequency 1~10 kHz) through motor signal connector 11, driving stepper motor 1 to rotate forward or reverse by a preset number of steps. The output shaft of stepper motor 1 is linked to guide cylinder 15 via a threaded pair or worm gear mechanism. For example, every 200 steps (1 revolution) can move guide cylinder 15 by 0.0075 mm (guide cylinder thread pitch is 1.5, 1.8° corresponds to 0.0075) mm, corresponding to a change of 0.2 MPa in the preload of pressure regulating spring 14.

[0025] In this embodiment, the valve seat 12 is provided with an elongated orifice for regulating the pressure of external fuel. When fuel in the common rail enters the valve seat 12 through the inlet connector, the elongated orifice (e.g., orifice diameter 2mm, length-to-diameter ratio >10) inside converts turbulent flow into laminar flow through the throttling effect, reducing the pressure pulsation amplitude and achieving initial pressure stabilization.

[0026] Reference Figure 1 and Figure 2 The remote control pressure regulating valve also includes: an oil inlet connector 7 and an oil outlet connector 8 connected to the valve body 6; the oil inlet connector 7 is used to introduce external fuel into the valve seat 12; the oil outlet connector 8 is used to discharge the pressurized fuel in the valve seat 12 when the valve core 13 is opened.

[0027] The oil inlet connector 7 connects to the internal threaded hole on the valve body 6 via an external thread, using a standard sealing thread (such as an SAE straight thread or tapered thread) to ensure no leakage at the connection. An O-ring or metal gasket (such as a copper gasket) is installed at the threaded connection to prevent fuel from leaking from the interface under high pressure.

[0028] Similar to the inlet connector 7, the outlet connector 8 is threaded to the other end of the valve body 6 and is usually arranged symmetrically with the inlet connector 7 to form a fuel input-output channel. An O-ring or metal gasket (such as a copper gasket) is installed at the threaded connection to prevent fuel leakage from the interface under high pressure.

[0029] With its threaded connection and sealing ring design, the system can maintain a long-term seal under high pressure (e.g., 20~50 MPa), preventing fuel leakage from causing a decrease in system efficiency or safety hazards.

[0030] The inlet connector 7 and outlet connector 8 are standard interfaces (such as G1 / 4 or NPT1 / 2), which can be adapted to fuel lines of different diameters, facilitating system integration and maintenance.

[0031] The threaded connection between the oil inlet connector 7, the oil outlet connector 8 and the valve body 6 allows for quick disassembly, facilitating the replacement or cleaning of internal components (such as the valve seat 12 and the valve core 13).

[0032] As the inlet for fuel to enter the pressure regulating valve, the inlet diameter of the oil inlet 7 (e.g., Φ5 mm) needs to be matched with the flow requirements of the common rail system to avoid throttling losses. The oil inlet 7 works in conjunction with the elongated hole inside the valve seat 12 to reduce pressure fluctuations by limiting the fuel flow rate (e.g., laminarization), thus providing a stable input for subsequent pressure regulation.

[0033] When the valve core 13 is released from its seal, the oil outlet connector 8 discharges the pressurized fuel to the downstream injection system or return pipeline. The diameter of the oil outlet in the oil outlet connector 8 (e.g., Φ4 mm) is smaller than that of the oil inlet, and back pressure is formed through the difference in cross-sectional area, which helps the pressure regulating spring 14 to achieve dynamic pressure balance.

[0034] The larger diameter of the inlet connector 7 ensures that fuel quickly fills the valve seat 12, while the smaller diameter of the outlet connector 8 provides a controllable pressure relief rate. Together, they achieve precise pressure regulation.

[0035] The materials (such as stainless steel or brass) of the inlet connector 7 and outlet connector 8 can be selected according to the fuel type (methanol or diesel), and the corrosion-resistant design extends the service life.

[0036] In methanol fuel applications, the inlet connector 7 and outlet connector 8 can also be made of antistatic materials (such as nickel-plated brass) to avoid static sparks generated by fuel flow.

[0037] Reference Figure 1 and Figure 2 The remote control pressure regulating valve in this embodiment also includes an oil connector 5 connected to the valve body 6, which is used to provide lubricating oil to the valve core 13.

[0038] The lubricating oil connector 5 is connected to the pre-drilled threaded hole on the valve body 6 via an external thread, using standard specifications (such as G1 / 8 or NPT1 / 8) to ensure a secure installation. Fluororubber O-rings or copper gaskets are installed at the threaded connection to prevent lubricating oil leakage, while also withstanding high pressure (such as 20~50 MPa) and high temperature (-40°C to 150°C) environments.

[0039] The lubricating joint (5 parts) is equipped with an axial guide oil hole (e.g., hole diameter Φ4 mm), which is connected to the lubrication channel inside the valve body 6, and directly delivers lubricating oil to the moving contact surface of the valve core 13.

[0040] The lubricating oil connector 5 is periodically injected with lubricating oil (such as ISO VG32 hydraulic oil) through an external oil pump or centralized lubrication system. The lubricating oil enters the internal passage of the valve body 6 through the oil guide hole.

[0041] Reference Figure 1 and Figure 2In this embodiment, the remote control pressure regulating valve also includes: a support plate 3, an end cover 9, and an adapter 10; the stepper motor 1 is fixed on the support plate 3, and the support plate 3, the end cover 9, and the valve body 6 are integrally connected by screws 2 and nuts 4; the drive shaft of the stepper motor 1 passes through the support plate 3 and is connected to the adapter 10, and the other end of the adapter 10 passes through the end cover 9 and contacts the guide cylinder 15.

[0042] The adapter 10 connects to the stepper motor 1, converting the motor's kinetic energy into the potential energy of the pressure regulating spring 14.

[0043] The support plate 4 is matched with the mounting flange of the stepper motor 1 through machined positioning holes and fixed with high-strength bolts to ensure the stability of the motor under vibration or impact conditions.

[0044] The support plate 4 is rigidly connected to the valve body 6 and end cap 9 by screws 3 and nuts 5, forming an integrated frame that disperses mechanical stress and prevents structural deformation caused by pressure fluctuations. The use of two fixing nuts 4 with reverse threads enables good positioning under high pressure and high frequency vibration environments.

[0045] The end cap 9 is fitted to the end of the valve body 6 through the flange face and sealed with a metal spiral wound gasket to prevent fuel leakage.

[0046] The end cap 9 has a precision guide hole (tolerance H7 / g6) at its center for axial positioning of the adapter 10, ensuring that its contact surface with the guide tube 15 is coaxial (≤0.02 mm).

[0047] One end of the adapter 10 is connected to the drive shaft of the stepper motor 1 through a spline or positioning hole, and the other end is coupled to the guide cylinder 15 through a ball head or a flat contact, thereby realizing the conversion of rotary motion to linear displacement.

[0048] The ball joint structure of the adapter 10 can compensate for assembly errors (such as axial deviation ±0.1 mm) and prevent the guide tube 15 from jamming due to eccentric force.

[0049] The precision guide and adaptive structure of the adapter 10 ensures that the rotation angle of the stepper motor 1 (e.g., 1.8° / step) is transmitted to the guide cylinder 15 without loss, and the preload adjustment accuracy of the pressure regulating spring 14 reaches ±0.5%.

[0050] After removing screws 2 and nuts 4, the support plate 3 or end cap 9 can be replaced separately without disassembling the entire valve body 6, reducing maintenance time by 50%.

[0051] In flammable environments, the support plate 3 and end cap 9 are made of spark-free materials (such as aluminum alloy anodized treatment), and the adapter 10 is nickel-plated on the surface for corrosion protection and to avoid static electricity accumulation.

[0052] In this embodiment, the valve seat 12 and each connector are sealed by a line-to-surface seal, and the sealing between the two is improved by causing deformation through pressure.

[0053] External fuel enters the valve seat 12 through the inlet connector 7, and after initial pressure stabilization through the elongated orifice, it pushes the valve core 13. The pressure regulating spring 14 dynamically balances the preload with the fuel pressure to control the sealing and pressure relief of the valve core 13. The stepper motor 1 receives pulse signals and drives the adapter 10 and guide cylinder 15 to adjust the spring preload, thereby achieving remote and precise pressure control.

[0054] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0055] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0056] It should also be noted that, in this document, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used for ease of description and simplification of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, relational terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements does not include those elements, but also includes other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0057] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand this utility model, and the content of this specification should not be construed as a limitation of this utility model. Furthermore, for those skilled in the art, there will be different forms of changes in the specific implementation methods and application scope based on this utility model. It is neither necessary nor possible to exhaustively list all implementation methods here, but obvious changes or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A remote-controlled pressure regulating valve, characterized in that, It includes a stepper motor (1), valve body (6), guide cylinder (15), pressure regulating spring (14), valve core (13) and valve seat (12); The guide tube (15), the pressure regulating spring (14), the valve core (13) and the valve seat (12) are sequentially assembled inside the valve body (6); After external fuel enters the valve seat (12), the sealing of the valve core (13) on the valve seat (12) causes the fuel pressure to increase further. The fuel pressure acts on the bottom of the valve core (13) and is transmitted to the pressure regulating spring (14). When the fuel pressure exceeds the preload of the pressure regulating spring (14), the valve core (13) releases the seal on the valve seat (12), and the fuel is discharged outward. The stepper motor (1) receives external pulse signals through the motor signal connector (11) and rotates forward or backward according to the external pulse signals to drive the guide cylinder (15) to move, thereby adjusting the preload of the pressure regulating spring (14) and achieving precise control of fuel pressure.

2. The remote-controlled pressure regulating valve according to claim 1, characterized in that, The valve seat (12) has a narrow orifice inside for regulating the pressure of external fuel.

3. The remote-controlled pressure regulating valve according to claim 1, characterized in that, The remote control pressure regulating valve also includes an oil inlet connector (7) and an oil outlet connector (8) connected to the valve body (6). The oil inlet connector (7) is used to introduce external fuel into the valve seat (12); The oil outlet connector (8) is used to discharge the pressurized fuel in the valve seat (12) when the valve core (13) is opened.

4. The remote-controlled pressure regulating valve according to claim 1, characterized in that, The remote control pressure regulating valve also includes an oil connector (5) connected to the valve body (6), the oil connector (5) being used to supply lubricating oil to the valve core (13).

5. The remote-controlled pressure regulating valve according to claim 1, characterized in that, The remote control pressure regulating valve also includes: a support plate (3), an end cap (9), and an adapter (10). The stepper motor (1) is fixed on the support plate (3). The support plate (3), end cap (9) and valve body (6) are connected as a whole by screws (2) and nuts (4). The drive shaft of the stepper motor (1) passes through the support plate (3) and is connected to the adapter (10). The other end of the adapter (10) passes through the end cover (9) and contacts the guide tube (15).

6. The remote-controlled pressure regulating valve according to claim 5, characterized in that, The adapter (10) is screwed to the end cap (9).

7. The remote-controlled pressure regulating valve according to claim 1, characterized in that, The screws (2) and nuts (4) are in two sets, with the two nuts (4) having different directions of rotation.

8. The remote-controlled pressure regulating valve according to claim 1, characterized in that, The stepper motor (1) is an explosion-proof stepper motor.

9. The remote-controlled pressure regulating valve according to any one of claims 1-8, characterized in that, The remote-controlled pressure regulating valve is used for regulating the pressure of methanol, ammonia, natural gas, or hydrogen.

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