Pilot valve limiting structure for achieving multi-gear opening degree work of gas valve

Abstract

The invention discloses a pilot valve limiting structure for achieving multi-gear opening degree work of a gas valve. The pilot valve limiting structure comprises a pilot valve body, a piston rod, a limiting rod, a valve element, a main valve body and a drive control device. The upper side of the pilot valve body is connected with the driving control device, and the lower side is connected with the main valve body; the upper part of the limiting rod penetrates through the upper wall surface of the pilot valve body and is fixedly connected with a driving control device; the driving control device controls the plane rotation of the limiting rod and sets a static position; a cylindrical cavity is reserved in the middle of the upper end face of the piston rod, a rectangular groove is formed in the diameter direction of a circle, a protrusion is arranged on the first-stage side face and matched with a guide groove of the pilot valve body, and the second-stage side face penetrates through a hole formed in the center of the upper end face of the main valve body. The valve element is arranged in the main valve body, and a cylindrical groove is formed in the center of the upper end of the valve element and matched with the third stage of the piston rod. By controlling the stroke of the piston rod, the actual stroke of the valve element of the gas valve connected with the piston rod is changed, control over the opening degrees of various gears of the gas valve is achieved, and the valve structure and the control mode are more concise and efficient.

Description

Technical Field

[0001] The invention relates to a pilot valve limiting structure for realizing multi-gear opening of a gas valve, and belongs to the field of aerospace engines. Background Art

[0002] Traditional solid rocket engines are mostly single-shot working engines. After ignition and start-up, the engine flows through a fixed throat, and its flow rate is only controlled by changes in the propellant combustion surface. That is, it works according to a predetermined thrust, and it is difficult to achieve rapid changes in the ventilation area in the middle.

[0003] In order to realize the energy control of solid rocket engines, the high-temperature gas valves used in solid rocket engines are currently divided into two main types according to their working modes: switch valves and regulating valves for throat area control. The former only has two states, switch valves, which does not meet the flow regulation needs, and the latter regulates the flow by changing the channel area. For the regulation needs that only require two fixed flow states, the common throat plug type gas regulating valve is too complicated in both structure and control method, which is not conducive to the rapid change of throat area. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a pilot valve limit structure for realizing multi-gear opening of a gas valve, and to realize rapid control of the multi-gear opening of the valve by controlling the valve core stroke.

[0005] The technical solution of the present invention is: a pilot valve limit structure for realizing multi-speed opening of a gas valve, comprising: a pilot valve body, a limit rod, a piston rod, a valve core, a main valve body and a drive control device, wherein:

[0006] The main valve body is a hollow structure, with a gas inlet at the bottom, a gas outlet at the side, and a hole at the center of the upper end surface;

[0007] The valve core is placed in the main valve body, and a cylindrical groove is arranged at the center of the upper end of the valve core;

[0008] The pilot valve body is hollow inside, with the upper end fixedly connected to the housing of the drive control device, and a hole is opened on the upper wall for the upper part of the limit rod to pass through; the lower end is not closed and is fixedly connected to the upper end of the main valve body; a group of opposite guide grooves are vertically arranged on the inner wall of the pilot valve body; a pipeline for the high-temperature gas to enter and discharge is arranged on the upper wall of the pilot valve body;

[0009] The piston rod is a cylinder with a gradually decreasing diameter in three steps from top to bottom along the central axis, namely the first step, the second step, and the third step:

[0010] The first stage of the piston rod is placed in the cavity of the pilot valve body, and a symmetrical protrusion is arranged on the outer side near the lower end surface, which cooperates with a group of relative guide grooves vertically arranged on the inner wall of the pilot valve body to complete the up and down movement of the piston rod; a cylindrical cavity is left in the middle of the upper end surface of the first stage of the piston rod, and a plurality of pairs of rectangular grooves of different depths are arranged on the cylindrical cavity along the diameter direction of the circle;

[0011] The second stage of the piston rod passes through the central opening on the upper end face of the main valve body, and the two cooperate with each other;

[0012] The third stage of the piston rod extends into the hollow structure of the main valve body, and is gap-matched with the central cylindrical groove at the upper end of the valve core, and the central axis of the third stage of the piston rod coincides with the central axis of the central cylindrical groove at the upper end of the valve core;

[0013] The limit rod is in an inverted T shape; the upper part of the limit rod is a cylinder, which passes through the opening on the upper wall of the pilot valve body and cooperates with it, and the part extending out of the upper wall of the pilot valve body is fixedly connected to the rotary motion component of the drive control device; the lower width of the limit rod is less than or equal to the width of the rectangular groove on the first-stage upper end face of the piston rod.

[0014] Preferably, the opening on the upper wall of the pilot valve body and the upper cylinder of the limit rod, the first stage of the piston rod and the pilot valve body, and the position where the central opening on the upper end surface of the main valve body and the second stage of the piston rod cooperate with each other are all sealed with a high-temperature resistant dynamic sealing structure.

[0015] Preferably, the longitudinal length of the guide groove inside the pilot valve body should meet all movement strokes of the piston rod, and its axial depth should not cause failure of the high temperature resistant dynamic sealing structure between the pilot valve body and the piston rod.

[0016] Preferably, a clearance fit or a transition fit is formed between the symmetrical protrusions disposed on the outer side of the first-stage piston rod adjacent to the lower end surface and the guide groove of the pilot valve body.

[0017] Preferably, the depth of the cylindrical cavity in the middle of the first-stage upper end surface of the piston rod is not less than the depth of the deepest rectangular groove on its outer side.

[0018] Preferably, the rotary motion component of the drive control device controls the upper part of the rotary limit rod to drive the lower part of the limit rod to rotate in a plane, and according to the opening requirement, the lower part of the limit rod is stationary at a position parallel to the rectangular groove corresponding to the upper end face of the piston rod and the valve opening requirement.

[0019] Preferably, the pilot valve body, limit rod, piston rod, valve core, and main valve body are all made of high-temperature resistant and high-strength metal materials. High temperature refers to a temperature range greater than 2000°C, and high strength refers to the mechanical properties requirements of the material: room temperature tensile strength greater than 1000MPa, and 500°C tensile strength greater than 650MPa.

[0020] Preferably, multiple pairs of rectangular grooves of different depths are arranged on the outer side of the cylindrical cavity on the first-stage upper end face of the piston rod along the diameter direction of the circle, wherein: the rectangular grooves with shallower depths correspond to the small gear opening of the valve, and the rectangular grooves with deeper depths correspond to the large gear opening of the valve.

[0021] Preferably, the maximum distance between the lower end of the valve core and the main valve body is equal to the maximum stroke of the piston rod, and when the valve core moves downward to contact the gas inlet of the main valve body, the end face sealing between the lower surface of the valve core and the horizontal inner surface of the main valve body on the gas inlet side is achieved.

[0022] Preferably, the main valve body adopts a split design.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] The pilot valve limit structure of the present invention adopts a rotary drive control device to drive the limit rod and the multi-stage rectangular groove arranged on the upper end surface of the piston rod. By controlling the stroke of the piston rod, the actual stroke of the valve core of the gas valve connected thereto is changed, thereby realizing the control of the opening of the gas valve in multiple gears. The structure and control method are more simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural cross-sectional view of the valve of the present invention when the valve is at the maximum gear opening;

[0026] Figure 2 It is a structural cross-sectional view of the valve of the present invention when it is in the middle gear opening;

[0027] Figure 3 It is a schematic diagram of the gear switching process of the present invention. DETAILED DESCRIPTION

[0028] The present invention provides a pilot valve limit structure for realizing multi-speed opening of a gas valve, wherein the upper side of a pilot valve body is connected to a drive control device, an upper wall surface is provided with a hole for a limit rod to pass through, the lower side is connected to a working assembly, and a guide groove is provided on a side wall surface; the limit rod is fixedly connected to the drive control device, the drive control device controls the limit rod to maintain a plane rotation in the pilot valve body, and the rotational static position of the limit rod is set according to the position of a rectangular groove of a piston rod, and a high-temperature resistant dynamic seal is adopted between the pilot valve body and the limit rod; a rectangular groove is provided transversely penetrating along the circumference of the upper end surface of the piston rod, and a protrusion on the lower end surface is assembled with the guide groove of the pilot valve body, so as to ensure that the piston rod has only an up and down translational movement relative to the pilot valve body. When the valve is closed, after the limit rod is driven by the drive control device to stop at the position corresponding to the shallow rectangular groove of the piston rod, the piston rod moves up to the highest position under the action of the upper and lower pressure differences, and the piston rod stroke is small, so that the valve can work at a small gear opening; after the valve returns to the closed state, after the limit rod is driven by the drive control device to stop at the position corresponding to the deepest rectangular groove of the piston rod, the piston rod moves up to the highest position under the action of the upper and lower pressure differences, and the piston rod stroke is maximum, so that the valve can work at the maximum gear opening. This working mode can be reciprocated multiple times as needed. By limiting the stroke of the piston rod, the size of the gas valve opening gear can be controlled.

[0029] The present invention will be further described below in conjunction with the accompanying drawings. Figure 1 and Figure 2 As shown, the present invention provides a pilot valve limit structure for realizing multi-speed opening of a gas valve, wherein Figure 1 This is the structural cross-section diagram of the valve at its maximum gear opening. Figure 2 It is a structural cross-sectional view of the valve at the middle gear opening, characterized in that it includes a pilot valve body 1, a limit rod 2, a piston rod 3, a valve core 4, a main valve body 5 and a drive control device;

[0030] The pilot valve body 1 is a hollow structure inside, and its upper end is fixedly connected to the outer shell of the drive control device, which is used to fix the entire pilot valve limit structure; the upper wall of the pilot valve body 1 has a hole for the limit rod 2 to pass through, and the lower end is not closed and is fixedly connected to the upper end of the main valve body 5. A set of relative guide grooves are vertically arranged on the inner wall of the pilot valve body 1 for the assembly, movement and positioning of the piston rod 3; the longitudinal length of the guide groove should meet all the movement strokes of the piston rod 3, and its axial depth should not cause the high-temperature dynamic sealing structure between the pilot valve body 1 and the piston rod 3 to fail. The upper wall of the pilot valve body 1 is provided with a pipeline for high-temperature gas to enter the inner cavity and to discharge the entered high-temperature gas. The inner cavity is formed by the cylindrical cavity arranged between the pilot valve body 1 and the upper end surface of the piston rod 3. The upper wall of the pilot valve body 1 can be set to a special shape according to requirements.

[0031] The limit rod 2 is in an inverted T shape; the upper part of the limit rod 2 is a cylinder, which can cooperate with the opening on the upper wall of the pilot valve body 1, and at the same time, a high-temperature resistant dynamic seal is used to seal the limit rod 2 and the opening on the upper wall of the pilot valve body 1; the rotary motion component of the drive control device is fixedly connected to the part of the upper part of the limit rod 2 that extends out of the upper wall of the pilot valve body 1; the lower part of the limit rod 2 is an arbitrary cylinder, and the cross-section is enclosed within the envelope of the rectangular groove on the upper end face of the piston rod 3; the rotary motion component of the drive control device controls the upper part of the rotation of the limit rod 2 so that the lower part of the limit rod 2 rotates in a plane within the pilot valve body 1, and sets the lower rotational static position of the limit rod 2 according to the position of the rectangular groove of the piston rod 3 (that is, the valve opening requirement): the lower part of the limit rod 2 is stationary when it is parallel to the rectangular groove on the upper end face of the piston rod 3 corresponding to the valve opening requirement.

[0032] The housing of the drive control device is fixedly connected to the pilot valve body 1 for fixing the pilot valve body 1; the rotary motion component of the drive control device is fixedly connected to the portion of the limit rod 2 extending from the upper wall of the pilot valve body 1 for regulating the rotation and positioning of the limit rod 2

[0033] The piston rod 3 is a cylinder with a gradually decreasing diameter in the form of three steps from top to bottom along the central axis, which are the first stage, the second stage, and the third stage respectively; the first stage of the piston rod 3 is placed in the cavity of the pilot valve body 1, and a high-temperature resistant dynamic sealing structure is adopted between it and the pilot valve body 1; a symmetrical protrusion is arranged on the outer side near the lower end face, and the symmetrical protrusion and the guide groove of the pilot valve body 1 have a clearance fit, which can also be a transition fit, to ensure that the piston rod 3 does not undergo obvious circular rotation around the central axis when moving up and down, and to ensure that the resistance from the guide groove does not have a significant impact on the normal working movement of the piston rod 3. A cylindrical cavity is left in the middle of the first-stage upper end face of the piston rod 3. A plurality of pairs of rectangular grooves of different depths are opened on the outside of the cylindrical cavity on the upper end face of the piston rod 3 along the diameter direction of the circle. The groove width is not less than the lower width of the limit rod 2. The depth of the rectangular groove is related to the gear opening: the shallower rectangular groove corresponds to the small gear opening of the valve, and the deeper rectangular groove corresponds to the large gear opening of the valve; the depth of the cylindrical cavity on the first-stage upper end face of the piston rod 3 is not less than the depth of the deepest rectangular groove; the high-temperature gas enters or is discharged from the pipeline of the pilot valve body 1 into or out of the cylindrical cavity, providing gas pressure for the up and down movement of the piston rod 3.

[0034] The second stage of the piston rod 3 passes through the central opening of the upper end surface of the main valve body 5, and the two cooperate with each other;

[0035] The third stage of the piston rod 3 extends into the hollow structure of the main valve body 5, and is fitted with the central cylindrical groove at the upper end of the valve core 4 with a clearance whose central axis coincides;

[0036] The process of the piston rod 3 completing the opening adjustment is:

[0037] The high-temperature gas enters the cylindrical cavity on the upper end face of the piston rod 3 through the high-temperature gas inlet pipe on the upper wall of the pilot valve body 1, so that the piston rod 3 moves downward under the action of pressure. After the limit rod 2 is driven by the rotation of the rotary motion component of the drive control device and stops in the direction of the rectangular groove corresponding to the depth of the required opening position, the high-temperature gas in the cylindrical cavity on the upper end face of the piston rod 3 is discharged through the high-temperature gas exhaust pipe on the upper wall of the pilot valve body 1. The piston rod 3 moves up to the horizontal bottom surface of the rectangular groove and is completely in contact with the lower surface of the limit rod 2, so that the opening of the gas valve connected at the lower side meets the requirements.

[0038] When the valve is in the closed state, when the limit rod 2 is stationary at the small gear opening working setting position driven by the drive control device, after the piston rod 3 moves up to the highest position under the action of the upper and lower pressure differences, the shallower rectangular groove bottom surface contacts the lower surface of the limit rod 2, and the piston rod 3 has a small stroke, so that the flow area under the valve core 4 is smaller than the outlet area of ​​the main valve body 5, thereby realizing the small gear opening operation of the valve; after the valve returns to the closed state, when the limit rod 2 is stationary at the maximum gear opening working setting position driven by the drive control device, after the piston rod 3 moves up to the highest position under the action of the upper and lower pressure differences, the deepest rectangular groove bottom surface contacts the lower surface of the limit rod 2, the piston rod 3 has a maximum stroke, and the flow area under the valve core 4 is larger than the outlet area of ​​the main valve body 5, thereby realizing the maximum gear opening operation of the valve.

[0039] The valve core 4 is placed in the main valve body 5. A cylindrical groove is arranged at the center of the upper end of the valve core 4, and its opening is matched with the lower end of the third stage of the piston rod 3 with a clearance that coincides with the central axis. When the valve is working, the valve core 4 can move downward with the piston rod 3 to contact the gas inlet of the main valve body 5 to achieve the end face sealing between the lower surface of the valve core and the horizontal inner surface on one side of the gas inlet of the main valve body, and the valve is in a closed state. The maximum distance between the lower end of the valve core 4 and the gas inlet of the main valve body 5 is equal to the maximum stroke of the piston rod 3, and when the valve is working at different gear openings, the flow area formed by the lower side of the valve core 4 and the lower end of the main valve body 5 is not equal.

[0040] The main valve body 5 is a hollow main body structure as a whole, and has interfaces for gas inflow and outflow, wherein the gas inlet is located at the bottom of the main valve body 5, and the gas outlet is located on the side of the main valve body 5; the center of the upper end surface of the main valve body 5 is opened, and the opening cooperates with the second stage of the piston rod 3, and a high-temperature resistant dynamic seal is used at the cooperation position. The main valve body 5 adopts a split design, which is intended to enable the valve core 4 to be installed in the cavity of the main valve body 5, and the cavity still has a volume for gas to fully flow and build pressure after the valve core 4 is installed.

[0041] The pilot valve body 1, the limit rod 2, the piston rod 3, the valve core 4 and the main valve body 5 are all made of high-temperature resistant and high-strength metal materials. The high temperature refers to the temperature range greater than 2000°C, and the high strength refers to the mechanical property requirements of the material: the room temperature tensile strength is greater than 1000MPa, and the 500°C tensile strength is greater than 650MPa.

[0042] When the present invention is used to switch gears, Figure 3 As shown, its workflow is:

[0043] When the valve works normally, high-temperature gas enters the inner cavity of the main valve body 5 through the gas inlet of the main valve body 5. The pressure of the high-temperature gas pushes the valve core 4 upward to fit tightly with the piston rod 3. The piston rod 3 pushes upward, and the rectangular groove corresponding to the gear position on the piston rod 3 fits tightly with the limit rod 2.

[0044] When the valve opening needs to be adjusted, the high-temperature gas enters the cylindrical cavity on the upper end face of the piston rod 3 through the pipeline for high-temperature gas entry on the upper wall of the pilot valve body 1, so that the piston rod 3 moves downward under the action of pressure. After the limit rod 2 is driven by the rotation of the rotary motion component of the drive control device and stops in the direction of the rectangular groove with the depth corresponding to the required opening gear, the high-temperature gas enters the inner cavity of the main valve body 5 through the gas inlet of the main valve body 5. The pressure of the high-temperature gas pushes the valve core 4 upward, and further pushes the piston rod 3 upward along the guide rail, so that the high-temperature gas in the cylindrical cavity on the upper end face of the piston rod 3 is discharged through the pipeline for high-temperature gas discharge on the upper wall of the pilot valve body 1. The piston rod 3 goes up to the horizontal bottom surface of the rectangular groove and is completely in contact with the lower surface of the limit rod 2 with the gear opening adjusted, so that the opening of the gas valve connected at the lower side meets the requirements.

[0045] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in this field.

Claims

1. A pilot valve limit structure for realizing multi-position opening of a gas valve, characterized in that include: A pilot valve body (1), a limit rod (2), a piston rod (3), a valve core (4), a main valve body (5) and a drive control device, wherein: The main valve body (5) is a hollow structure, with a gas inlet at the bottom, a gas outlet at the side, and a hole at the center of the upper end surface; The valve core (4) is placed in the main valve body (5), and a cylindrical groove is provided at the center of the upper end of the valve core (4); The pilot valve body (1) has a hollow structure inside, the upper end of which is fixedly connected to the housing of the drive control device, and the upper wall surface is provided with a hole for the upper part of the limit rod (2) to pass through; the lower end is not closed and is fixedly connected to the upper end of the main valve body (5); a group of opposite guide grooves are vertically arranged on the inner wall surface of the pilot valve body (1); and a pipeline for high-temperature fuel gas to enter and be discharged is arranged on the upper wall surface of the pilot valve body (1); The piston rod (3) is a cylinder with a gradually decreasing diameter in three steps from top to bottom along the central axis, namely the first step, the second step and the third step respectively: The first stage of the piston rod (3) is placed in the cavity of the pilot valve body (1), and a symmetrical protrusion is arranged on the outer side near the lower end surface, which cooperates with a group of opposite guide grooves vertically arranged on the inner wall of the pilot valve body (1) to complete the up and down movement of the piston rod (3); a cylindrical cavity is left in the middle of the upper end surface of the first stage of the piston rod (3), and a plurality of pairs of rectangular grooves of different depths are arranged on the cylindrical cavity along the diameter direction of the circle; The second stage of the piston rod (3) passes through the central opening of the upper end surface of the main valve body (5), and the two cooperate with each other; The third stage of the piston rod (3) extends into the hollow structure of the main valve body (5), and is clearance-matched with the central cylindrical groove at the upper end of the valve core (4), and the central axis of the third stage of the piston rod (3) coincides with the central axis of the central cylindrical groove at the upper end of the valve core (4); The limit rod (2) is in an inverted T-shape; the upper portion of the limit rod (2) is a cylinder, which passes through an opening on the upper wall of the pilot valve body (1) and cooperates with the opening; the portion extending out of the upper wall of the pilot valve body (1) is fixedly connected to a rotary motion component of the drive control device; the lower portion of the limit rod (2) has a width less than or equal to a width of a rectangular groove on the first-stage upper end surface of the piston rod (3).

2. A pilot valve limiting structure for realizing multi-position opening of a gas valve according to claim 1, characterized in that: The opening on the upper wall of the pilot valve body (1) and the upper cylinder of the limit rod (2), the first stage of the piston rod (3) and the pilot valve body (1), and the position where the central opening on the upper end surface of the main valve body (5) and the second stage of the piston rod (3) cooperate with each other are all sealed with a high-temperature resistant dynamic sealing structure.

3. A pilot valve limiting structure for realizing multi-position opening of a gas valve according to claim 2, characterized in that: The longitudinal length of the guide groove inside the pilot valve body (1) should meet all the moving strokes of the piston rod (3), and its axial depth should not cause the high temperature resistant dynamic sealing structure between the pilot valve body (1) and the piston rod (3) to fail.

4. The pilot valve limiting structure for realizing multi-position opening of a gas valve according to claim 1, characterized in that: A clearance fit or a transition fit is formed between a symmetrical protrusion arranged on the outer side of the first stage adjacent to the lower end surface of the piston rod (3) and a guide groove of the pilot valve body (1).

5. The pilot valve limiting structure for realizing multi-position opening of a gas valve according to claim 1, characterized in that: The depth of the cylindrical cavity in the middle of the first-stage upper end surface of the piston rod (3) is not less than the depth of the deepest rectangular groove on its outer side.

6. The pilot valve limiting structure for realizing multi-position opening of a gas valve according to claim 1, characterized in that: The rotary motion component of the drive control device controls the upper part of the rotary limit rod (2) to drive the lower part of the limit rod (2) to rotate in a plane, and according to the opening requirement, the lower part of the limit rod (2) is stationary at a position parallel to the rectangular groove on the upper end surface of the piston rod (3) corresponding to the valve opening requirement.

7. The pilot valve limiting structure for realizing multi-position opening of a gas valve according to claim 1, characterized in that: The pilot valve body (1), the limit rod (2), the piston rod (3), the valve core (4) and the main valve body (5) are all made of high-temperature resistant and high-strength metal materials. The high temperature refers to a temperature range greater than 2000°C, and the high strength refers to the mechanical property requirements of the material: the room temperature tensile strength is greater than 1000MPa, and the 500°C tensile strength is greater than 650MPa.

8. The pilot valve limiting structure for realizing multi-position opening of a gas valve according to claim 1, characterized in that: A plurality of pairs of rectangular grooves of different depths are arranged on the outer side of the cylindrical cavity on the first-stage upper end surface of the piston rod (3) along the diameter direction of the circle, wherein: The shallower rectangular groove corresponds to the small gear opening of the valve, and the deeper rectangular groove corresponds to the large gear opening of the valve.

9. The pilot valve limiting structure for realizing multi-position opening of a gas valve according to claim 1, characterized in that: The maximum distance between the lower end of the valve core (4) and the main valve body (5) is equal to the maximum stroke of the piston rod (3), and when the valve core (4) moves downward to contact the gas inlet of the main valve body (5), an end face seal is achieved between the lower surface of the valve core and the horizontal inner surface of the main valve body on the gas inlet side.

10. The pilot valve limiting structure for realizing multi-position opening of a gas valve according to claim 1, characterized in that: The main valve body (5) adopts a split design.

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