Flow regulating valve, engine gas generator

Abstract

The application belongs to a kind of regulating valve, to solve the technical problem that existing flow regulating valve is mostly electric control valve, not easy to disassemble and control logic is complex, provide a kind of flow regulating valve, engine gas generator, the side wall of valve body is provided with pressure sensing port, inlet and outlet. The upper end of flow control piece is sealingly and slidably connected with the inner wall of the first valve cavity, and the upper end divides the first valve cavity into a first sub-valve cavity and a second sub-valve cavity. The pressure sensing port is in communication with the first sub-valve cavity. The upper end of the flow control piece is connected with or cooperates with the first elastic member. The outer wall of the lower end of the flow control piece is provided with an inclined groove. The cross-sectional dimension of the inclined groove gradually decreases from bottom to top. The second valve cavity includes a third sub-valve cavity and a fourth sub-valve cavity coaxially arranged. The inner diameter of the third sub-valve cavity is smaller than that of the fourth sub-valve cavity. The upper end of the valve core is sealingly and slidably connected with the inner wall of the third sub-valve cavity or the upper end abuts against the lower end surface outside the third sub-valve cavity. The valve core is provided with the first elastic member outside. The inlet is in communication with the inlet cavity. The second sub-valve cavity is in communication with the third sub-valve cavity.

Description

Technical Field

[0001] This invention pertains to a regulating valve, specifically a flow regulating valve and an engine gas generator. Background Technology

[0002] In the mechanical field, most applications involving fluid media require adjustment of the fluid flow rate according to the operating conditions, which leads to the widespread use of flow control valves.

[0003] In an engine's gas generator, for example, the fuel system and lubricating oil system share the same pump, with a single motor driving both sets of gears simultaneously. However, the required supply of lubricating oil and fuel varies under different operating conditions. Therefore, a flow control valve is needed to ensure precise control of fuel flow. Existing flow control valves are mostly electronically controlled, which are difficult to disassemble and have complex control logic. Summary of the Invention

[0004] This invention addresses the technical problems of existing flow control valves being mostly electrically controlled valves, which are difficult to disassemble and have complex control logic, by providing a flow control valve and an engine gas generator.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A flow regulating valve is characterized in that it includes a valve body, a flow control component, and a valve core; the valve body has a first valve chamber, a second valve chamber, and an inlet chamber, and the valve body side wall has a pressure sensing port, an inlet, and an outlet;

[0007] The upper end of the flow control component is sealed and slides against the inner wall of the first valve chamber to form a piston motion pair. The upper end of the flow control component divides the first valve chamber into a first sub-valve chamber located above and a second sub-valve chamber located below, which are separated from each other. The pressure sensing port is used to connect to an external control fluid circuit and communicates with the first sub-valve chamber. The first sub-valve chamber, the second sub-valve chamber, and the inlet chamber are coaxially arranged. A first elastic element is provided in the second sub-valve chamber. The lower end of the first elastic element is connected to or abuts against the lower end of the second sub-valve chamber. The upper end of the flow control component is connected to or cooperates with the upper end of the first elastic element.

[0008] A seal is installed inside the liquid inlet chamber, and a gap is left between the seal and the lower end face of the liquid inlet chamber to form an inlet mouth; the lower outer wall of the flow control component is sealed and fitted with the inner wall of the seal, and the outer wall is provided with an inclined groove, the cross-sectional size of which gradually decreases from bottom to top;

[0009] The second valve chamber includes a third sub-valve chamber and a fourth sub-valve chamber arranged coaxially. The inner diameter of the third sub-valve chamber is smaller than that of the fourth sub-valve chamber. A fixed seat is installed at the lower end of the fourth sub-valve chamber. The fixed seat has a first guide hole along the axial direction. The lower end of the valve core is slidably engaged with the inner wall of the first guide hole, and the upper end is slidably engaged with the inner wall of the third sub-valve chamber or abuts against the lower outer surface of the third sub-valve chamber. A second elastic element is provided on the outside of the valve core. The upper part of the second elastic element is connected to or abuts against the valve core, and the lower end is connected to or abuts against the fixed seat. The outlet is located on the side wall of the fourth sub-valve chamber.

[0010] The inlet is connected to the inlet cavity, and the second sub-valve cavity is connected to the third sub-valve cavity.

[0011] Furthermore, it also includes valve sleeves;

[0012] The first elastic element, valve sleeve, and flow control element are sequentially fitted from the outside to the inside, with the flow control element connected to the valve sleeve.

[0013] Furthermore, the upper outer wall of the valve sleeve is provided with an annular limiting platform, and the upper end of the first elastic element is connected to or abuts against the lower end face of the annular limiting platform.

[0014] The lower outer end face of the valve sleeve is provided with a limiting post, and the flow control component is located inside the limiting post;

[0015] The flow control component has a columnar limiting platform on its upper outer wall. The columnar limiting platform is located inside the valve sleeve. The outer wall of the columnar limiting platform and the inner wall of the first valve cavity are in a sealed sliding fit to form a piston motion pair.

[0016] Furthermore, the inner wall of the barrier is provided with an annular barrier boss, and the lower outer wall of the flow control component is sealed and fitted with the inner wall of the barrier boss.

[0017] Furthermore, the second valve chamber is located outside the liquid inlet chamber.

[0018] Furthermore, a connecting hole is provided on the lower end face of the second sub-valve cavity, and the second sub-valve cavity and the third sub-valve cavity are connected through the connecting hole.

[0019] Furthermore, the connecting hole is opened along the axial direction.

[0020] Furthermore, the valve body includes a valve body and an end cap, with an opening at the upper end of the valve body, and an end cap is detachably and sealingly installed at the opening at the upper end of the valve body.

[0021] The lower end face of the end cap extends downward along the axial direction to form a piston guide section. The piston guide section is located inside the valve sleeve. A second guide hole is provided in the piston guide section along the axial direction. The columnar limiting platform is located inside the second guide hole, and the outer wall of the columnar limiting platform and the inner wall of the second guide hole are in a sealing sliding fit to form a piston movement pair.

[0022] The second guide hole forms the first sub-valve chamber above the piston moving pair.

[0023] The present invention also provides an engine gas generator, including an electric motor, a fuel pump, a fuel injection ring and a fuel supply line, characterized in that it also includes the aforementioned flow regulating valve;

[0024] The inlet of the flow regulating valve is connected to the injection ring, the outlet is connected to the fuel pump inlet, and the pressure sensing port is connected to the fuel supply line.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. This invention proposes a flow regulating valve, wherein a first valve chamber, a first elastic element, a flow control element, an inlet chamber, and a sealing barrier constitute a control valve section. This control valve can regulate the movement of the flow control element according to the pressure at the pressure sensing port, thereby adjusting the size of the gap between the inclined groove on the flow control element and the sealing barrier to regulate the flow rate of the medium entering from the inlet. Simultaneously, a second valve chamber, a second elastic element, a fixed seat, and a valve core constitute a one-way valve section, which can prevent backflow of the medium and thus prevent the flow regulating valve's control accuracy from being affected by backflow. The flow regulating valve of this invention can adjust the medium flow rate in real time according to the pressure at the pressure sensing port. Furthermore, based on the shape and cross-sectional dimensions of the inclined groove, the continuity and range of flow regulation can be adjusted, thus achieving precise, continuous, reliable, and safe flow regulation.

[0027] 2. The flow regulating valve of the present invention is further provided with a valve sleeve, which is located between the first elastic element and the flow control element. This enables the flow control element in the control valve to move more smoothly. In addition, it also makes the structure of the control valve more compact and easier to achieve miniaturization and weight reduction.

[0028] 3. In this invention, the limiting post provided on the lower outer end face of the valve sleeve and the columnar limiting platform provided on the upper outer wall of the flow control component can both improve the linear motion stability of the flow control component.

[0029] 4. The inner wall of the sealing barrier in this invention is provided with an annular sealing barrier protrusion, which can effectively reduce the weight of the sealing barrier, thereby reducing the weight of the flow regulating valve of this invention.

[0030] 5. In this invention, the valve body may include a valve body and an end cap, indicating that the valve body can be a split structure. The end cap can be detachably and sealed at the upper opening of the valve body, making it convenient to disassemble and assemble the flow regulating valve of this invention when maintenance or replacement of parts is required. In specific applications, it is convenient to maintain and replace, and the entire flow regulating valve does not need to be scrapped due to the damage of some parts, effectively saving the cost of use. Attached Figure Description

[0031] Figure 1This is an axial sectional view of an embodiment of the flow regulating valve of the present invention;

[0032] Figure 2 To and Figure 1 Axial section views at different angles

[0033] Figure 3 This is a schematic diagram of the flow control component in an embodiment of the present invention;

[0034] Figure 4 For the present invention Figure 1 TT cross-sectional view (only used to show the lower surface of the first sub-valve chamber).

[0035] Wherein: 1-valve body, 2-first valve chamber, 201-first sub-valve chamber, 202-second sub-valve chamber, 3-second valve chamber, 301-third sub-valve chamber, 302-fourth sub-valve chamber, 4-pressure sensing port, 5-inlet, 6-outlet, 7-flow control component, 8-fixed seat, 9-liquid inlet chamber, 10-sloping groove, 11-seal, 12-valve core, 13-first guide hole, 14-inlet cavity, 15-first elastic element, 16-valve sleeve, 17-annular limiting platform, 18-limiting post, 19-column-shaped limiting platform, 20-seal boss, 21-connecting hole, 22-end cap, 23-second guide hole, 24-piston guide section, 25-passage, 26-second elastic element. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] This invention provides a valve structure capable of regulating the flow rate of a fluid medium, ensuring the reliability and accuracy of flow regulation while also allowing for easy disassembly.

[0038] like Figure 1 and Figure 2 As shown, a flow regulating valve includes a valve body 1, a flow control component 7, and a valve core 12. The valve body 1 has a first valve chamber 2, a second valve chamber 3, and a liquid inlet chamber 9. The valve body sidewall has a pressure sensing port 4, an inlet 5, and an outlet 6.

[0039] The structure of the present invention will be specifically described below according to a specific embodiment of the present invention:

[0040] The upper end of the flow control component 7 has a sealing sliding fit with the inner wall of the first valve chamber 2, forming a piston motion pair. The upper end of the flow control component 7 divides the first valve chamber 2 into a first sub-valve chamber 201 located above and a second sub-valve chamber 202 located below, which are mutually isolated. The pressure sensing port 4 is used to connect to the external control fluid circuit and communicates with the first sub-valve chamber 201. The first sub-valve chamber 201, the second sub-valve chamber 202 and the inlet chamber 9 are coaxially arranged, and the second sub-valve chamber 202 is located between the first sub-valve chamber 201 and the inlet chamber 9. The second sub-valve chamber 202 is provided with a first elastic element. The lower end of the first elastic element is connected to or abuts against the lower end of the second sub-valve chamber 202, and the upper end of the flow control component 7 is connected to or cooperates with the upper end of the first elastic element. Specifically, a valve sleeve is also provided. The first elastic element 15, valve sleeve 16, and flow control element 7 are sequentially fitted from the outside to the inside. The upper outer wall of the valve sleeve 16 is provided with an annular limiting platform 17. The upper end of the first elastic element 15 abuts against the lower end face of the annular limiting platform 17. The first elastic element 15 is fitted outside the valve sleeve 16. Through the annular limiting platform 17 at the upper end of the valve sleeve 16, the axial movement of the flow control element 7 can be made more stable. The pressure sensing port 4 is connected to the external control fluid circuit, and at the same time, it is connected to the first sub-valve chamber 201 through the passage 25 opened in the valve body 1. The upper outer wall of the flow control element 7 is provided with a columnar limiting platform 19. The columnar limiting platform 19 is located inside the valve sleeve 16. The outer wall of the columnar limiting platform 19 and the inner wall of the first valve chamber 2 are sealed and slidingly fitted to form a piston movement pair. The lower outer end face of the valve sleeve 16 is provided with a limiting post 18. The flow control element 7 is located inside the limiting post 18 and connected to the valve sleeve 16.

[0041] The inlet chamber 9 is located below the second sub-valve chamber 202, which is coaxially arranged with the inlet chamber 9. A seal 11 is installed inside the inlet chamber 9, with a gap between the seal 11 and the lower end face of the inlet chamber 9, forming an inlet cavity 14. The lower outer wall of the flow control component 7 is sealed and fitted to the inner wall of the seal 11. Figure 3 As shown, the lower outer wall of the flow control component 7 has a sloping groove 10. The cross-sectional dimensions of the sloping groove 10 gradually decrease from bottom to top. Multiple sloping grooves 10 can be evenly opened circumferentially on the side wall of the flow control component 7. The setting of the sealing block 11 blocks the second sub-valve chamber 202 located above the inlet chamber 9 from communicating with the inlet chamber 14. In addition, in order to reduce weight, an annular sealing boss 20 can be provided on the inner wall of the sealing block 11, so that the lower outer wall of the flow control component 7 and the inner wall of the sealing boss 20 are sealed and fitted. Specifically, a portion of the axial direction of the sealing boss 20 can be machined into a hexagon to form a standard structure, which is more convenient for subsequent maintenance and adjustment.

[0042] The second valve chamber 3 is located outside the inlet chamber 9 and below the second sub-valve chamber 202. The second valve chamber 3 includes a third sub-valve chamber 301 and a fourth sub-valve chamber 302 arranged coaxially. The inner diameter of the third sub-valve chamber 301 is smaller than that of the fourth sub-valve chamber 302. The valve body 1 at the lower end of the fourth sub-valve chamber 302 has an opening, and a fixed seat 8 is sealed and installed at this opening. The fixed seat 8 has a first guide hole 13 opened along the axial direction. The first guide hole 13 can be a through hole or a blind hole opened on the upper surface of the fixed seat 8. The lower end of the valve core 12 The valve core 12 slides within the inner wall of the first guide hole 13, with its upper end abutting against the lower outer surface of the third sub-valve cavity 301. Since the inner diameter of the third sub-valve cavity 301 is smaller than that of the fourth sub-valve cavity 302, a gap will exist between the outer wall of the valve core 12 and the inner wall of the fourth sub-valve cavity 302 when the upper end of the valve core 12 moves to the fourth sub-valve cavity 302. A second elastic element 26 is provided on the outside of the valve core 12. The upper end of the second elastic element 26 is connected to or abuts against the valve core 12, and the lower end is connected to or abuts against the fixed seat 8. The outlet 6 is located on the side wall of the fourth sub-valve cavity 302. The inlet 5 communicates with the inlet cavity 14. A communicating hole 21 communicating with the third sub-valve cavity 301 is axially formed on the lower surface of the second sub-valve cavity 202.

[0043] The control section, consisting of valve sleeve 16, first elastic element 15, first valve chamber 2, passage 25, and pressure sensing port 4, is equivalent to a control valve. The second valve chamber 3, valve core 12, fixed seat 8, and second elastic element 26 constitute a one-way valve.

[0044] The specific working principle of the flow regulating valve of the present invention is as follows:

[0045] The control fluid path enters the first sub-valve chamber 201 through the pressure-sensing port 4 and the passage 25. When the pressure of the control fluid path is low, it is less than the spring force of the first elastic element 15, and the first elastic element 15 is in a non-compressible natural state. The upper end of the flow control element 7 is located at the upper end of the first valve chamber 2, and the gap between the lower end of the flow control element 7 inclined groove 10 and the inner wall of the sealing boss 20 in the sealing 11 is at its maximum value. The fluid medium whose flow rate is to be controlled enters the inlet chamber 14 through the inlet 5, and then enters the second sub-valve chamber 202 through the gap between the inclined groove 10 and the inner wall of the sealing boss 20. Then it enters the third sub-valve chamber 301 through the connecting hole 21, applying pressure to the upper end face of the valve core 12. The lower end of the valve core 12 moves downward under the sliding fit with the first guide hole 13. At the same time, the second elastic element 26 is compressed, and the fluid medium whose flow rate is to be controlled enters the fourth sub-valve chamber 302 from the third sub-valve chamber 301, and then exits through the outlet. As the pressure of the control fluid circuit gradually increases, it overcomes the spring force of the first elastic element 15, pushing the flow control element 7 and the valve sleeve 16 downward. This causes the flow control element 7 to move downward. At the same time, the first elastic element 15 is compressed, and the gap between the lower end of the flow control element 7's inclined groove 10 and the inner wall of the sealing boss 20 in the sealing 11 gradually decreases as the flow control element 7 moves downward. After the fluid medium whose flow rate is to be controlled enters the inlet cavity 14 through the inlet 5, the flow rate through the gap between the inclined groove 10 and the inner wall of the sealing boss 20 also gradually decreases as the flow control element 7 moves downward. Therefore, the flow rate of the fluid medium whose flow rate is to be controlled gradually decreases as it passes through the connecting hole 21, the third sub-valve cavity 301, and the fourth sub-valve cavity 302 and flows out of the outlet 6.

[0046] Therefore, the flow regulating valve of the present invention can control the flow rate of the fluid medium to be controlled in real time according to the pressure of the control liquid circuit, achieving continuous control while also adjusting in real time according to the pressure of the control liquid circuit, with high reliability and accuracy.

[0047] In other embodiments of the present invention, the valve body 1 can be either integral or split. As a split embodiment, the valve body 1 includes a valve body and an end cap 22. The upper end of the valve body can be open, and the end cap 22 is detachably and sealed at the upper opening of the valve body 1. The lower end face of the end cap 22 extends axially downward to form a piston guide section 24, which is located within the valve sleeve 16. A second guide hole 23 is axially formed within the piston guide section 24, and a columnar limiting platform 19 is located within the second guide hole 23. The outer wall of the columnar limiting platform 19 and the inner wall of the second guide hole 23 are in a sealed sliding fit to form a piston movement pair. A first sub-valve chamber 201 is formed within the second guide hole 23 above the piston movement pair. On the one hand, the detachable end cap 22 facilitates the maintenance and disassembly of the flow regulating valve of the present invention; on the other hand, by setting the piston guide section 24 and the columnar limiting platform 19 in cooperation, the vertical movement of the flow control component 7 can be effectively limited, further improving the axial movement stability of the flow control component 7, thereby improving the reliability and safety of the present invention.

[0048] As a typical application, this invention also provides an engine gas generator, in which the flow regulating valve described above is applied to control the fuel flow in the engine. The engine gas generator in this embodiment includes a motor, a fuel pump, a fuel injection ring, a fuel supply line, and the aforementioned flow regulating valve. The inlet 5 of the flow regulating valve is connected to the fuel injection ring, the outlet is connected to the fuel pump inlet, and the pressure-sensing port 4 is connected to the fuel supply line. During the initial engine operation phase, due to the high demand for lubricating oil, the motor output power is increased to ensure the lubricating oil supply. However, at this time, the fuel demand is not high, and excess fuel at the fuel injection ring is returned to the inlet 5 of the flow regulating valve. At this time, the pressure at the pressure-sensing port 4 is low, the flow control element 7 is at its uppermost position, and the gap between the inclined groove 10 and the sealing boss 20 is at its maximum value. After flowing in from the inlet 5, the fuel passes sequentially through the inlet chamber 9, the connecting hole 21, the third sub-valve chamber 301, and the fourth sub-valve chamber 302 before flowing out from the outlet 6. During ignition, the fuel pump's fuel supply capacity is increased. This leads to a corresponding increase in pressure at the pressure sensing port 4, raising the pressure at the inlet 5 and increasing the return fuel flow. When the fuel supply pressure reaches the minimum critical value, it pushes the flow control component 7 downwards. As the flow control component 7 continues to move downwards, the gap between the inclined groove 10 and the sealing boss 20 decreases, slowing the rate of increase in return fuel flow. With further increases in fuel supply pressure, the gap between the inclined groove 10 and the sealing boss 20 further decreases, and the return fuel flow begins to decrease. When the fuel supply pressure exceeds the maximum critical value, the gap between the inclined groove 10 and the sealing boss 20 becomes zero, and the return fuel flow also decreases to zero, ensuring fuel supply requirements are met.

[0049] This invention also optimizes the materials of each component. The end cap 22, fixing seat 8, valve body 1, and sealing block 11 are all made of metal with anodized surfaces. The valve body 1, serving as the carrier for assembling the various components, forms the flow channels and valve chambers. Sealing gaskets and sealing rings can be installed at each partition to further enhance sealing. The sealing gaskets can be made of polytetrafluoroethylene (PTFE). Both the second elastic element 26 and the first elastic element 15 can be cylindrical compression springs made of stainless steel wire. The valve core 12 is made of metal with a corrosion-resistant layer. The valve sleeve 16 is also made of metal with a corrosion-resistant layer. This improves the durability and reliability of the flow regulating valve of this invention.

[0050] In this invention, both the first and second elastic elements can be springs, or other structures or components capable of achieving elasticity can be used.

[0051] Furthermore, the terms "upper" and "lower" used in this invention are for the purpose of clearly describing relative positions. They are "upper" and "lower" as defined in the description and do not imply that the flow regulating valve of this invention can only be used in a certain direction.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flow regulating valve, characterized in that: It includes a valve body (1), a flow control component (7), and a valve core (12); the valve body (1) has a first valve chamber (2), a second valve chamber (3), and an inlet chamber (9), and the valve body side wall has a pressure sensing port (4), an inlet (5), and an outlet (6); The upper end of the flow control component (7) is sealed and slidably fitted with the inner wall of the first valve chamber (2) to form a piston motion pair. The upper end of the flow control component (7) divides the first valve chamber (2) into a first sub-valve chamber (201) located above and a second sub-valve chamber (202) located below, which are separated from each other. The pressure sensing port (4) is used to connect with the external control liquid circuit and communicates with the first sub-valve chamber (201). The first sub-valve chamber (201), the second sub-valve chamber (202) and the liquid inlet chamber (9) are coaxially arranged. The second sub-valve chamber (202) is provided with a first elastic element. The lower end of the first elastic element is connected to or abuts against the lower end of the second sub-valve chamber (202). The upper end of the flow control component (7) is connected to or cooperates with the upper end of the first elastic element. A baffle (11) is installed inside the liquid inlet chamber (9), and a gap is left between the baffle (11) and the lower end face of the liquid inlet chamber (9) to form an inlet cavity (14); the lower outer wall of the flow control component (7) is sealed and fitted with the inner wall of the baffle (11), and the outer wall is provided with a slanted groove (10), the cross-sectional size of the slanted groove (10) gradually decreases from bottom to top; The second valve chamber (3) includes a third sub-valve chamber (301) and a fourth sub-valve chamber (302) arranged coaxially. The inner diameter of the third sub-valve chamber (301) is smaller than that of the fourth sub-valve chamber (302). A fixed seat (8) is installed at the lower end of the fourth sub-valve chamber (302). The fixed seat (8) has a first guide hole (13) along the axial direction. The lower end of the valve core (12) slides with the inner wall of the first guide hole (13), and the upper end slides with the inner wall of the third sub-valve chamber (301) or abuts against the lower outer surface of the third sub-valve chamber (301). A second elastic element (26) is provided on the outside of the valve core (12). The upper end of the second elastic element (26) is connected to or abuts against the valve core (12), and the lower end is connected to or abuts against the fixed seat (8). The outlet (6) is located on the side wall of the fourth sub-valve chamber (302). The inlet (5) is connected to the inlet cavity (14), and the second sub-valve cavity (202) is connected to the third sub-valve cavity (301).

2. The flow regulating valve according to claim 1, characterized in that: It also includes a valve sleeve (16); The first elastic element (15), valve sleeve (16) and flow control element (7) are sequentially sleeved from the outside to the inside, and the flow control element (7) is connected to the valve sleeve (16).

3. The flow regulating valve according to claim 2, characterized in that: The valve sleeve (16) has an annular limiting platform (17) on its upper outer wall, and the upper end of the first elastic element (15) is connected to or abuts against the lower end face of the annular limiting platform (17). The valve sleeve (16) has a limiting post (18) on its lower outer end face, and the flow control component (7) is located inside the limiting post (18); The flow control component (7) has a columnar limiting platform (19) on its upper outer wall. The columnar limiting platform (19) is located inside the valve sleeve (16). The outer wall of the columnar limiting platform (19) and the inner wall of the first valve cavity (2) are sealed and slidingly fitted to form a piston motion pair.

4. A flow regulating valve according to any one of claims 1 to 3, characterized in that: The inner wall of the seal (11) is provided with an annular seal protrusion (20), and the lower outer wall of the flow control component (7) is sealed and fitted with the inner wall of the seal protrusion (20).

5. The flow regulating valve according to claim 4, characterized in that: The second valve chamber (3) is located outside the liquid inlet chamber (9).

6. The flow regulating valve according to claim 5, characterized in that: The second sub-valve chamber (202) has a connecting hole (21) on its lower end face, and the second sub-valve chamber (202) and the third sub-valve chamber (301) are connected through the connecting hole (21).

7. A flow regulating valve according to claim 6, characterized in that: The connecting hole (21) is opened along the axial direction.

8. The flow regulating valve according to claim 7, characterized in that: The valve body (1) includes a valve body and an end cap (22). The valve body has an opening at the upper end, and the end cap (22) is detachably and sealed at the opening at the upper end of the valve body (1). The lower end face of the end cap (22) extends downward along the axial direction to form a piston guide section (24). The piston guide section (24) is located inside the valve sleeve (16). A second guide hole (23) is provided in the piston guide section (24) along the axial direction. A columnar limiting platform (19) is located inside the second guide hole (23). The outer wall of the columnar limiting platform (19) and the inner wall of the second guide hole (23) are sealed and slidingly fitted to form a piston movement pair. The second guide hole (23) forms a first sub-valve chamber (201) located above the piston moving pair.

9. An engine gas generator, comprising an electric motor, a fuel pump, a fuel injection ring, and a fuel supply line, characterized in that: It also includes the flow regulating valve according to any one of claims 1 to 8; The inlet (5) of the flow regulating valve is connected to the injection ring, the outlet is connected to the fuel pump inlet, and the pressure sensing port (4) is connected to the fuel supply line.

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