Pressure reduction combination valve

Abstract

The utility model relates to the technical field of space propulsion, in particular to a pressure reduction combination valve. The pressure reducing combination valve comprises a body, an electric explosion valve, a first-stage pressure reducing valve, a second-stage pressure reducing valve and a safety valve. An inlet is formed in one side of the body, an outlet is formed in the other side of the body, a switch hole is formed in the side, close to the inlet, of the body, a first protruding body is arranged on the side, opposite to the inlet, of the body, a first-stage pressure reducing hole extending into the body is formed in the first protruding body, and a second protruding body is arranged at the position, close to the first protruding body, of the body. The second protruding body is provided with a first second-stage pressure reducing hole extending into the body, a second second-stage pressure reducing hole is formed in the side, opposite to the second protruding body, of the body, a safety hole is formed in the side, close to the outlet, of the body, and multiple sections of hole channels are formed in the body. According to the highly-integrated pressure reduction combination valve, it is guaranteed that pipelines are simple, the size is small, the weight is light, assemblies are easy to replace, and the requirements for high integration degree and high reliability of a pressurization conveying system are met.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of space propulsion, and particularly to a pressure reducing combined valve. Background Art

[0002] Space propulsion technology is a technology that converts energy such as chemical energy and electrical energy into the jet kinetic energy of propellants, and plays an important role in aspects such as manned spaceflight, artificial satellites, launch vehicles, deep space probes, and defense systems. Space propulsion ensures the reliable implementation of the manned spaceflight project, enables artificial satellites to stay in orbit for a long time, ensures the accurate orbit injection of launch vehicles, helps probes navigate in interstellar space, and enhances the high-efficiency maneuverability of defense systems.

[0003] The pressurization and delivery system in a liquid propulsion system is a comprehensive system that controls the gas pressure in the propellant tank and delivers it to the engine pump or combustion chamber at a specified pressure and flow rate, connecting the propellant storage tank, engine, and ground equipment. According to different functions, the components of the pressurization and delivery system can be divided into pipelines, valves, gas cylinders, accumulators, storage tanks, effectors, ejectors, sensors, anti-rotation and anti-collapse devices, etc. Valves are important products in the rocket pressurization and delivery system, and their main functions include opening and closing fluid passages, reversing, regulating flow rate and pressure, and protecting the safety of the system. In the pressurization and delivery system of launch vehicles, valves such as filling valves, solenoid valves, safety valves, electro-explosive valves, pressure reducing valves, and check valves are widely used.

[0004] A pressure reducing valve is a valve that can reduce the pressure of the input fluid medium and automatically maintain the stability of the outlet pressure relying on the energy of the fluid medium itself. The pressure reducing valve in the pressurization and delivery system is often installed between the storage tank and the gas cylinder to regulate and reduce the high-pressure gas in the gas cylinder, and then enter the storage tank at a specified flow rate after throttling through a flow limiting element. The existing combined pressure reducing valve is composed of multiple individual valves connected in series through pipelines, and has problems such as many and complex system pipelines, large size, heavy weight, and single function, and cannot meet the requirements of high integration and high reliability of the pressurization and delivery system. Summary of the Utility Model

[0005] The purpose of the embodiments of the present application is to provide a pressure reducing combined valve, which can make the pipeline of the pressure reducing combined valve simple, small in volume, and light in weight, and meet the requirements of high integration and high reliability of the pressurization and delivery system.

[0006] To solve the above technical problems, an embodiment of the present application provides a pressure reducing combined valve, which includes a body, an electric explosion valve, a first-stage pressure reducing valve, a second-stage pressure reducing valve, and a safety valve. An inlet is provided on one side of the body, and an outlet is provided on the other side. A switch hole is opened on the side of the body close to the inlet, and a first protruding body is provided on the side of the body opposite to the inlet. The first protruding body is provided with a first-stage pressure reducing hole extending into the interior of the body. A second protruding body is provided at a position close to the first protruding body on the body. The second protruding body is provided with a first second-stage pressure reducing hole extending into the interior of the body. A second second-stage pressure reducing hole is opened on the side of the body opposite to the second protruding body. A safety hole is opened on the side of the body close to the outlet. Multiple sections of pore channels are arranged inside the body, and the multiple sections of pore channels connect the inlet, the switch hole, the first-stage pressure reducing hole, the first second-stage pressure reducing hole, the second second-stage pressure reducing hole, the safety hole, and the outlet in sequence. The first protruding body and the second protruding body have an integrally formed overall structure with the body; the electric explosion valve is installed in the switch hole and is used to control the connection or disconnection of the gas flow path from the inlet to the first-stage pressure reducing hole; the first-stage pressure reducing valve is composed of a pressure reducing valve part installed in the first-stage pressure reducing hole and the first protruding body; the second-stage pressure reducing valve is composed of a pressure reducing valve part installed in the first second-stage pressure reducing hole, a pressure reducing valve part installed in the second second-stage pressure reducing hole, and the second protruding body; the safety valve is installed in the safety hole and is used to release the gas with too high pressure at the outlet.

[0007] A pressure reducing combined valve provided by an embodiment of the present application has an integrally formed overall structure made by integrally forming the body, the first protruding body, and the second protruding body. This overall structure is provided with an inlet, a switch hole, a first-stage pressure reducing hole, a first second-stage pressure reducing hole, a second second-stage pressure reducing hole, a safety hole, an outlet, and multiple sections of pore channels. The electric explosion valve, the first-stage pressure reducing valve, the second-stage pressure reducing valve, and the safety valve are all integrated on this overall structure. After the high-pressure gas enters the body from the inlet, it passes through the electric explosion valve, the first-stage pressure reducing valve, the second-stage pressure reducing valve, and the safety valve in sequence through the multiple sections of pore channels. After reaching the preset pressure value, it flows out from the outlet and enters the downstream storage tank for subsequent use. This highly integrated pressure reducing combined valve ensures that its pipeline is simple, the volume is small, the mass is light, and the components are easy to replace, meeting the requirements of high integration and high reliability of the booster transportation system.

[0008] In some embodiments, the second-stage pressure reducing valve adopts a full unloading structure.

[0009] In some embodiments, the pressure reducing valve part in the first second-stage pressure reducing hole includes a valve core and a valve hole. One end of the valve core passes through the valve hole and can move in the valve hole. The pressure reducing effect of the second-stage pressure reducing valve is controlled by controlling the gap size between the valve core and the valve hole.

[0010] In some embodiments, a partition plate is provided between the first second-stage pressure reducing hole and the second second-stage pressure reducing hole. The pore channel includes a first pore channel, and the first pore channel is arranged at the middle position of the partition plate.

[0011] In some embodiments, the pressure reducing valve part in the secondary pressure reducing hole two includes a piston push rod. The piston push rod passes through the first channel and contacts the end face of the valve core. The piston push rod controls the opening degree of the valve hole by controlling the movement of the valve core.

[0012] In some embodiments, the body is further provided with a high-pressure test hole, which is communicated with the primary pressure reducing hole, and a first filter is arranged in the high-pressure test hole.

[0013] In some embodiments, the body is further provided with a low-pressure test hole, which is communicated with the outlet, and a second filter is arranged in the low-pressure test hole.

[0014] In some embodiments, the body is further provided with a sensor hole, and a pressure sensor is installed in the sensor hole. The pressure sensor is used to monitor the pressure at the outlet.

[0015] In some embodiments, a third filter is arranged on the flow path between the electric explosion valve and the primary pressure reducing valve, and a fourth filter is arranged on the flow path between the primary pressure reducing valve and the secondary pressure reducing valve.

[0016] In some embodiments, the first protrusion, the second protrusion and the body are made of a titanium alloy material to form an integral structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the figures in the drawings do not constitute a scale limitation.

[0018] Figure 1 is a three-dimensional structural schematic diagram of the pressure reducing combined valve with the high-pressure test hole above provided by some embodiments of the present application;

[0019] Figure 2 is a three-dimensional structural schematic diagram of the pressure reducing combined valve with the installation interface above provided by some embodiments of the present application;

[0020] Figure 3 is a top view of the pressure reducing combined valve provided by some embodiments of the present application;

[0021] Figure 4 is the pressure reducing combined valve provided by some embodiments of the present application Figure 3 and is a schematic cross-sectional structure diagram at A-A' therein;

[0022] Figure 5 is a front structural schematic diagram of the pressure reducing combined valve with the installation interface on the outside provided by some embodiments of the present application;

[0023] Figure 6 is the pressure reducing combined valve provided by some embodiments of the present applicationFigure 5 Schematic diagram of the cross-sectional structure at B-B'

[0024] Figure 7 It is a schematic front view of the high-pressure test hole of the pressure-reducing combination valve provided in some embodiments of the present application on the outside.

[0025] Description of the reference numerals: 11 - body; 111 - inlet; 112 - outlet; 113 - switch hole; 114 - primary pressure-reducing hole; 115 - first secondary pressure-reducing hole; 116 - second secondary pressure-reducing hole; 117 - safety hole; 118 - duct; 1181 - first duct; 119 - high-pressure test hole; 120 - low-pressure test hole; 121 - sensor hole; 122 - isolation plate; 12 - electric explosion valve; 13 - primary pressure-reducing valve; 131 - first protrusion; 14 - secondary pressure-reducing valve; 141 - second protrusion; 142 - valve core; 143 - valve hole; 144 - piston push rod; 15 - safety valve; 16 - first filter; 17 - second filter; 18 - pressure sensor; 19 - third filter; 20 - fourth filter; 21 - mounting interface. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will elaborate on each implementation manner of the present application in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in each implementation manner of the present application, many technical details are presented for the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation manners, the technical solutions claimed in the present application can still be achieved. The division of the following various embodiments is for convenience of description and should not constitute any limitation to the specific implementation manner of the present application. Various embodiments can be combined and cross-referenced with each other on the premise of no contradiction.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0029] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0030] Space propulsion technology is a technology that converts energy such as chemical energy and electrical energy into the jet kinetic energy of propellants. It plays an important role in manned spaceflight, artificial satellites, launch vehicles, deep space probes, defense systems, etc. Space propulsion ensures the reliable implementation of the manned spaceflight project, enables artificial satellites to stay in orbit for a long time, ensures that launch vehicles accurately enter orbit, helps probes navigate in interstellar space, and enhances the high-efficiency maneuverability of defense systems.

[0031] The pressurization and delivery system in a liquid propulsion system is a comprehensive system that controls the gas pressure in the propellant tank and delivers it to the engine pump or combustion chamber at a specified pressure and flow rate, connecting the propellant storage tank, engine, and ground equipment. According to different functions, the components of the pressurization and delivery system can be divided into pipelines, valves, gas cylinders, accumulators, storage tanks, actuators, ejectors, sensors, anti-rotation and anti-collapse devices, etc. Valves are important products in the rocket pressurization and delivery system, and their main functions include performing the on / off, commutation, flow rate and pressure regulation of fluid passages, and protecting the safety of the system. In the pressurization and delivery system of launch vehicles, valves such as filling valves, solenoid valves, safety valves, electric explosion valves, pressure reducing valves, and check valves are widely used.

[0032] A pressure reducing valve is a valve that can reduce the pressure of the input fluid medium and automatically maintain the stability of the outlet pressure relying on the energy of the fluid medium itself. The pressure reducing valve in the pressurization and delivery system is often installed between the storage tank and the gas cylinder to regulate and reduce the high-pressure gas in the gas cylinder, and then enter the storage tank at a specified flow rate after throttling by a flow-limiting element. The existing combined pressure reducing valve is composed of multiple individual valves connected in series through pipelines, and has problems such as many and complex system pipelines, large size, heavy weight, and single function, and cannot meet the requirements of high integration and high reliability of the pressurization and delivery system.

[0033] Therefore, in order to achieve a simple pipeline, small volume, light weight, easy component replacement in the pressurized conveying system, and meet the requirements of high integration and high reliability of the pressurized conveying system. Some embodiments of the present application provide a pressure reducing combined valve, which is an integral structure made by integrally molding the body, the first protruding body and the second protruding body. This integral structure has an inlet, a switch hole, a primary pressure reducing hole, a secondary pressure reducing hole one, a secondary pressure reducing hole two, a safety hole, an outlet, and multiple sections of channels. The electric explosion valve, the primary pressure reducing valve, the secondary pressure reducing valve and the safety valve are all integrated on this integral structure. After the high-pressure gas enters the body from the inlet, it passes through the electric explosion valve, the primary pressure reducing valve, the secondary pressure reducing valve and the safety valve in sequence through multiple sections of channels. After reaching the preset pressure value, it flows out from the outlet and enters the downstream storage tank for subsequent use. This highly integrated pressure reducing combined valve ensures a simple pipeline, small volume, light weight, and easy component replacement, meeting the requirements of high integration and high reliability of the pressurized conveying system.

[0034] The following will combine Figures 1 to 7 to illustrate a pressure reducing combined valve provided by some embodiments of the present application.

[0035] As Figure 1 , Figure 2 , Figure 4 and Figure 6As shown in the figure, a pressure relief combination valve provided by some embodiments of the present application includes a body 11, an electric explosion valve 12, a primary pressure reducing valve 13, a secondary pressure reducing valve 14, and a safety valve 15. An inlet 111 is provided on one side of the body 11, and an outlet 112 is provided on the other side. A switch hole 113 is opened on the side of the body 11 close to the inlet 111. A first protruding body 131 is provided on the side of the body 11 opposite to the inlet 111. A primary pressure reducing hole 114 extending into the interior of the body 11 is opened in the first protruding body 131. A second protruding body 141 is provided at a position of the body 11 close to the first protruding body 131. A first secondary pressure reducing hole 115 extending into the body 11 is opened in the second protruding body 141. A second secondary pressure reducing hole 116 is opened on the side of the body 11 opposite to the second protruding body 141. A safety hole 117 is opened on the side of the body 11 close to the outlet 112. A plurality of sections of pore channels 118 are provided inside the body 11. The plurality of sections of pore channels 118 connect the inlet 111, the switch hole 113, the primary pressure reducing hole 114, the first secondary pressure reducing hole 115, the second secondary pressure reducing hole 116, the safety hole 117, and the outlet 112 in sequence. The first protruding body 131 and the second protruding body 141 are integrally formed with the body 11. The electric explosion valve 12 is installed in the switch hole 113 and is used to control the connection or disconnection of the gas flowing from the inlet 111 to the primary pressure reducing hole 114. The primary pressure reducing valve 13 is composed of a pressure reducing valve part installed in the primary pressure reducing hole 114 and the first protruding body 131. The secondary pressure reducing valve 14 is composed of a pressure reducing valve part installed in the first secondary pressure reducing hole 115, a pressure reducing valve part installed in the second secondary pressure reducing hole 116, and the second protruding body 141. The safety valve 15 is installed in the safety hole 117 and is used to release the gas with too high pressure at the outlet 112. When the pressure at the outlet 112 exceeds the preset value, the safety valve 15 automatically opens to release the gas at the outlet 112. When the pressure at the outlet 112 drops to the preset value, the safety valve 15 automatically closes.

[0036] It should be noted that, as Figure 1 and Figure 2As shown in the figure, the body 11 is an integrally formed box with an irregular shape, having six irregular faces. There are mounting interfaces 21 on the rear side, which are fixedly mounted at the designated mounting positions on the satellite or spacecraft through bolts. There are four mounting interfaces 21, with a depth of 8 mm and a size of M5 (the valve body has 4 M5×0.8 internal threads); an inlet 111 is provided on the upper side of the body 11, a switch hole 113 is provided at a position close to the inlet 111 on the left side, a protrusion one 131 and a primary pressure reducing hole 114 are provided on the lower side at a position opposite to the inlet 111, a protrusion two 141 and a secondary pressure reducing hole one 115 are provided at the middle position of the lower side, a secondary pressure reducing hole two 116 is provided at the middle position of the upper side of the body 11, an outlet 112 is provided on the right side, and a safety hole 117 is provided at one end of the lower side close to the outlet 112. A high-pressure gas cylinder filled with nitrogen, helium, argon or krypton is externally connected to the inlet 111 of the body 11, and the outlet 112 of the body 11 is connected to the inlet of the storage tank pressurizing gas of the pressurizing system. The switch hole 113, the primary pressure reducing hole 114, the secondary pressure reducing hole and the safety hole 117 can be provided with threads or snaps for convenient installation. The electric explosion valve 12, the primary pressure reducing valve 13 parts and the secondary pressure reducing valve 14 parts can be installed in the corresponding installation holes by an insertion installation method, and seals, gasket rings or gaskets are used for sealing to ensure the sealing of the whole structure. Different installation methods can be adopted according to the characteristics of different components. The inlet 111 and the outlet 112 can also have threads or snaps for convenient installation of the joints. The inlet 111 installation joint is connected to the gas cylinder through a pipeline, and the outlet 112 installation joint is connected to the storage tank through a pipeline. The multi-stage channel 118 is located inside the body 11 and is integrally formed with the body 11 during the manufacturing process. The channel 118 is used for gas flow and guides the gas from the inlet 111 into the electric explosion valve 12, the primary pressure reducing valve 13, the secondary pressure reducing valve 14 and the safety valve 15 in sequence. After the high-pressure gas is reduced to a predetermined medium pressure in the primary pressure reducing valve 13, it is reduced to a required low pressure in the secondary pressure reducing valve 14 and flows into the downstream storage tank from the outlet 112.

[0037] Specifically, the initial gas pressure at the high-pressure gas cylinder to the inlet 111 is approximately 60 MPa. The pressures after the first-stage decompression and the second-stage decompression are set according to the pressure required downstream of the outlet 112 of the combined valve (only when there is the condition of the pressure at the outlet 112 can the pressures after the first-stage decompression and the second-stage decompression be determined). The first-stage pressure reducing valve 13 and the second-stage pressure reducing valve 14 are both composed of existing pressure reducing valves or pressure reducing valve parts, and achieve the effect of pressure reduction through gas throttling, which is consistent with the principle of existing pressure reducing valves. The two-stage decompression structure ensures the stability of the pressure and flow rate at the outlet 112 within the full pressure and full flow range. The first-stage pressure reducing valve 13 is used to reduce the pressure change range at the inlet 111 of the second-stage pressure reducing valve 14, thereby improving the stability of the pressure at the outlet 112 of the second-stage pressure reducing valve 14, and at the same time reducing the locking load of the second-stage pressure reducing valve 14 (when the flow rate at the outlet 112 is zero, the pressure reducing valve is in a locked state, and the upstream high pressure acts on the sealing pair of the pressure reducing valve all the time. The long-term high-pressure locking of the pressure reducing valve will produce too deep indentations on the sealing pair, affecting the accuracy of its outlet 112). The electric explosion valve 12 is an electrical device used to detonate explosives or initiating devices, and the electric explosion valve 12 reliably isolates the upstream high-pressure gas. The electric explosion valve 12 can reliably isolate 60 MPa gas for a long time and has the ability of positive-direction anti-fatigue strength. The number of positive-direction anti-fatigue cycles (when the electric explosion valve 12 is not powered on, gas with working pressure is filled into its upstream and downstream from the test port for performance testing until the number of times of repeated gas filling) is not less than 50 times. When the system works, the electric explosion valve 12 is electrically detonated, and the high-pressure gas enters the first-stage pressure reducing valve 13. After the electric explosion valve 12 is electrically detonated, it is in an open state. After the system stops supplying gas, the electric explosion valve 12 can be replaced to make it regain the function of reliably isolating high-pressure gas.

[0038] In addition, the electric explosion valve 12, the first-stage pressure reducing valve 13, the second-stage pressure reducing valve 14, and the safety valve 15 have different internal channels according to different functions, control the opening and closing of different internal channels, and communicate with the orifices 118 at different positions in the body 11, so as to conduct or block the flow of gas. The safety valve 15 is used for overpressure relief protection. The safety valve 15 is integrated at the outlet 112 of the combined valve. When the pressure at the outlet 112 of the combined valve exceeds +3% of the rated value, the safety valve 15 automatically opens and discharges the overpressure gas until the pressure at the outlet 112 of the combined valve returns to within the rated deviation, and the safety valve 15 automatically closes. For combined valves in different usage states, other components such as an inflation valve and a high-pressure sensor can be added between the inlet 111 of the combined valve and the electric explosion valve 12. The inflation valve can inflate the gas cylinder connected to the inlet 111 or deflate the gas cylinder, and the high-pressure sensor can monitor the pressure at the inlet 111.

[0039] An embodiment of the present application provides a pressure reducing combination valve. By integrally forming a whole structure of the body 11, the first protruding body 131, and the second protruding body 141, this whole structure has an inlet 111, a switch hole 113, a primary pressure reducing hole 114, a first secondary pressure reducing hole 115, a second secondary pressure reducing hole 116, a safety hole 117, an outlet 112, and multiple sections of holes 118. The electric explosion valve 12, the primary pressure reducing valve 13, the secondary pressure reducing valve 14, and the safety valve 15 are all integrated on this whole structure. After the high-pressure gas in the gas cylinder enters the body 11 from the inlet 111, it passes through the electric explosion valve 12, the primary pressure reducing valve 13, the secondary pressure reducing valve 14, and the safety valve 15 successively through the multiple sections of holes 118. After reaching the preset pressure value, it flows out from the outlet 112 and enters the downstream storage tank for subsequent use. This highly integrated pressure reducing combination valve ensures that its pipeline is simple, small in volume, light in weight, and the components are easy to replace, meeting the requirements of high integration and high reliability of the booster delivery system. The pressure reducing combination valve provided by the present application has a more compact overall structural layout, can effectively reduce the volume and weight. After each component is individually tested and qualified, it is inserted on the body 11, which can shorten the test cycle, enhance maintainability and interchangeability.

[0040] In some embodiments of the present application, the secondary pressure reducing valve 14 adopts a full unloading structure.

[0041] It should be noted that the type of the pressure reducing valve needs to comprehensively consider factors such as the pressure reducing ratio, flow rate, and control accuracy. For the pressure reducing valve with a full unloading structure, the opening degree of the valve core 142 is controlled by the outlet 112 pressure acting on the piston push rod 144 and the elastic component, that is, the pressure reducing valve with a full unloading structure is not sensitive to the change of the inlet 111 pressure and is only related to the outlet 112 pressure. Adopting a full load pressure reducing valve can eliminate the influence of the change of the inlet 111 pressure of the combination valve on the outlet 112 pressure, with a fast dynamic characteristic response speed, a low pressure peak value (a pressure impact when starting the pressure reducing valve for the first time), and a stable and reliable locking pressure.

[0042] In some embodiments of the present application, the pressure reducing valve parts in the first secondary pressure reducing hole 115 include a valve core 142 and a valve hole 143. One end of the valve core 142 passes through the valve hole 143 and can move in the valve hole 143. The pressure reducing effect of the secondary pressure reducing valve 14 is controlled by controlling the gap size between the valve core 142 and the valve hole 143.

[0043] Specifically, such as Figure 3 and Figure 4As shown, the secondary pressure reducing valve 14 is divided into upper and lower parts. The pressure reducing valve parts installed in the first secondary pressure reducing hole 115 include a valve core 142, a valve hole 143, and other functional accessories such as an elastic component. The elastic component can control the up and down movement of the valve core 142, thereby changing the gap size between the valve core 142 and the valve hole 143 (i.e., changing the opening degree of the valve hole 143). The gas flows into the valve hole 143 after being decompressed by the primary pressure reducing valve 13. Different opening degrees of the valve hole 143 determine the pressure of the gas after being decompressed by the secondary pressure reducing valve 14.

[0044] In some embodiments of the present application, a partition plate 122 is provided between the first secondary pressure reducing hole 115 and the second secondary pressure reducing hole 116. The hole passage 118 includes a first hole passage 1181, and the first hole passage 1181 is provided at the middle position of the partition plate 122.

[0045] It should be noted that the partition plate 122 is a part of the body 11 and is also the upper and lower demarcation line between the first secondary pressure reducing hole 115 and the second secondary pressure reducing hole 116. The gas decompressed in the first secondary pressure reducing hole 115 flows out from the first hole passage 1181, then flows into the second secondary pressure reducing hole 116, and then into the subsequent hole passage 118.

[0046] In some embodiments of the present application, the pressure reducing valve parts in the second secondary pressure reducing hole 116 include a piston push rod 144. The piston push rod 144 passes through the first hole passage 1181 and contacts the end face of the valve core 142. The piston push rod 144 controls the movement of the valve core 142 to control the opening degree of the valve hole 143.

[0047] It should be noted that the pressure reducing valve parts in the second secondary pressure reducing hole 116 include a piston push rod 144 and other functional accessories such as an elastic component. The elastic component can indirectly control the up and down movement of the piston push rod 144, thereby acting on the valve core 142 in contact with the piston push rod 144, enabling the valve core 142 to move up and down, and finally changing the opening degree of the valve hole 143 to control the pressure reducing effect of the secondary pressure reduction. The elastic components in the first secondary pressure reducing hole 115 and the second secondary pressure reducing hole cooperate with each other to precisely control the gap size between the valve core 142 and the valve hole 143. The diameter of the first hole passage 1181 is larger than the cross-sectional size of the piston push rod 144, ensuring that while the piston push rod 144 moves, the gas can flow freely under low pressure. This design of dividing the existing secondary pressure reducing valve 14 into two parts, installing the two parts from opposite sides of the body 11 respectively, and cooperating with each other to achieve the pressure reducing effect makes full use of the space of the body 11 and makes the entire pressure reducing combined valve more compact.

[0048] In some embodiments of the present application, the body 11 is further provided with a high-pressure test hole 119. The high-pressure test hole 119 is communicated with the primary pressure reducing hole 114, and a first filter 16 is provided in the high-pressure test hole 119.

[0049] It should be noted that the high-pressure test hole 119 is normally closed. When detection is required, a test device is externally connected to the high-pressure test hole 119 to test the polarity of the downstream valve of the combined valve and detect whether the normally open or normally closed valve is in a normal open / closed state. Before the combined valve is used, gas with a pressure approximately equal to the rated working pressure is filled from the high-pressure test hole 119 upstream of the diaphragm of the electric explosion valve 12, and the airtightness of the electric explosion valve 12 can be tested. As Figure 5 and Figure 6 shown, at one end of the high-pressure test hole 119 close to the first-stage pressure reduction hole 114, there is a 10-μm flaky filter 16 to ensure the purity of the gas entering the combined valve from the high-pressure test hole 119 and prevent the excess substances generated by the electric explosion from entering the downstream. The filter 16 can be a flaky filter made of titanium alloy material.

[0050] In some embodiments of the present application, the body 11 is further provided with a low-pressure test hole 120. The low-pressure test hole 120 is communicated with the outlet 112, and a filter 17 is arranged in the low-pressure test hole 120.

[0051] It should be noted that the low-pressure test hole 120 is normally closed. Before the combined valve is used, gas with the rated working pressure is filled from the low-pressure test hole 120 into the downstream of the combined valve to test the polarity of the downstream valve and detect whether the normally open or normally closed valve downstream is in a normal open / closed state. Similar to the high-pressure test hole 119, a 10-μm flaky filter 17 is arranged in the low-pressure test hole 120 to ensure the purity of the gas entering the combined valve from the low-pressure test hole 120 and prevent debris from entering the downstream. The filter 17 can be a flaky filter sintered from stainless steel material.

[0052] In some embodiments of the present application, the body 11 is further provided with a sensor hole 121, and a pressure sensor 18 is installed in the sensor hole 121. The pressure sensor 18 is used to detect the pressure between the second-stage pressure reducing valve 14 and the outlet 112.

[0053] It should be noted that the pressure sensor 18 is used to monitor the pressure at the outlet 112 of the combined valve, monitor whether the outlet pressure of the combined valve meets the requirements, and provide telemetry data as a basis for judging the upstream and downstream fault points.

[0054] In some embodiments of the present application, a filter 19 is arranged on the flow path between the electric explosion valve 12 and the first-stage pressure reducing valve 13, and a filter 20 is arranged on the flow path between the first-stage pressure reducing valve 13 and the second-stage pressure reducing valve 14.

[0055] It should be noted that a 10-μm sheet-shaped filter three 19 is provided downstream of the electric explosion valve 12 to ensure the purity of the gas entering the combined valve and prevent the excess substances generated by the electric explosion from entering the downstream. The filter three 19 can be a sheet-shaped filter sintered from stainless steel material. The filter four 20 is arranged in the secondary pressure reduction hole one 115. The gas reduced in pressure by the primary pressure reducing valve 13 enters the secondary pressure reducing valve 14 after passing through the filter four 20 to ensure the purity of the gas entering the downstream of the combined valve. The filter four 20 is a 10-μm annular filter and can be made of stainless steel material.

[0056] In some embodiments of the present application, the protrusion one 131, the protrusion two 141, and the body 11 are made of a titanium alloy material to form an integral structure. For example, when used for hydrogen pressure reduction, it is recommended to use stainless steel material for production.

[0057] It should be noted that the integral structure of the protrusion one 131, the protrusion two 141, and the body 11 is a multi-channel box body formed integrally, with multiple connected pore channels 118 inside. It can be made by die casting or 3D printing. 3D printing is a preferred manufacturing method. Based on the designed 3D model file of the integral structure, titanium alloy is used to construct the integral structure by layer-by-layer printing. Titanium alloy has good creep resistance and thermal stability, high fatigue performance, and satisfactory fracture toughness, and is suitable for manufacturing various parts working in the temperature range from -196°C to 450°C. Titanium alloy also has excellent process plasticity and superplasticity, and is suitable for forming by various pressure processing methods. In aerospace, it is mainly used to manufacture various beams, frames, slide rails, landing gear beams in the aircraft structure, fan and compressor disks, blades of aero engines, the body 11, pressure vessels of space rockets, and various types of fasteners.

[0058] A pressure reduction combined valve provided by an embodiment of the present application has a high-pressure test hole 119, a low-pressure test hole 120, an outlet 112, an inlet 111, and multiple mounting holes machined on the body 11. By optimizing the structure of the pressure reducing valve body 11, the primary pressure reducing valve 13, the secondary pressure reducing valve 14, the electric explosion valve 12, multiple filters, the safety valve 15, and the pressure sensor 18 are integrated together in an inserted and sealed form, enhancing the functionality of the pressure reducing valve, reducing the number of connecting pipelines, the external dimensions, and the weight, and at the same time facilitating the replacement of components.

[0059] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A pressure reducing combination valve, characterized in that: include: A body, wherein an inlet is provided on one side of the body, and an outlet is provided on the other side, a switch hole is provided on the side of the body close to the inlet, a protrusion 1 is provided on the side of the body opposite to the inlet, a first-level pressure-reducing hole is provided on the protrusion 1 and extends to the inside of the body, a protrusion 2 is provided on the body at a position close to the protrusion 1, a second-level pressure-reducing hole 1 is provided on the protrusion 2 and extends to the inside of the body, a second-level pressure-reducing hole 2 is provided on the side of the body opposite to the protrusion 2, a safety hole is provided on the side of the body close to the outlet, a plurality of sections of channels are provided inside the body, and the plurality of sections of channels connect the inlet, the switch hole, the first-level pressure-reducing hole, the second-level pressure-reducing hole 1, the second-level pressure-reducing hole 2, the safety hole and the outlet in sequence, and the protrusion 1, the protrusion 2 and the body have an integral structure formed in one piece; An electric explosion valve, installed in the switch hole, for controlling the connection or disconnection of the flow path of the gas from the inlet to the primary pressure reducing hole; A first-stage pressure reducing valve, which is composed of a pressure reducing valve part installed in the first-stage pressure reducing hole and the protrusion 1; A two-stage pressure reducing valve, comprising a pressure reducing valve part installed in the second-stage pressure reducing hole one, a pressure reducing valve part installed in the second-stage pressure reducing hole two, and a protrusion two; A safety valve is installed in the safety hole and is used to release the gas with excessive pressure at the outlet.

2. A pressure reducing combination valve according to claim 1, characterized in that: The secondary pressure reducing valve adopts a full unloading structure.

3. A pressure reducing combination valve according to claim 1, characterized in that: The pressure reducing valve parts in the secondary pressure reducing hole 1 include a valve core and a valve hole. One end of the valve core passes through the valve hole and can move in the valve hole. The pressure reducing effect of the secondary pressure reducing valve is controlled by controlling the gap size between the valve core and the valve hole.

4. A pressure reducing combination valve according to claim 3, characterized in that: An isolation plate is arranged between the second-level pressure-reducing hole 1 and the second-level pressure-reducing hole 2, and the channel includes a first channel, and the first channel is arranged in the middle position of the isolation plate.

5. A pressure reducing combination valve according to claim 4, characterized in that: The pressure reducing valve parts in the second secondary pressure reducing hole include a piston push rod, which passes through the first channel and contacts the end surface of the valve core. The piston push rod controls the opening of the valve hole by controlling the movement of the valve core.

6. A pressure reducing combination valve according to claim 1, characterized in that: The main body is also provided with a high-pressure test hole, which is connected to the first-level pressure reducing hole, and a filter 1 is provided in the high-pressure test hole.

7. A pressure reducing combination valve according to claim 1, characterized in that: The body is also provided with a low-pressure test hole, the low-pressure test hole is communicated with the outlet, and a second filter is provided in the low-pressure test hole.

8. The pressure reducing combination valve according to claim 1, characterized in that: The body is also provided with a sensor hole, in which a pressure sensor is installed, and the pressure sensor is used to monitor the pressure of the outlet.

9. The pressure reducing combination valve according to claim 1, characterized in that: A filter three is provided on the flow path between the electric explosion valve and the first-stage pressure reducing valve, and a filter four is provided on the flow path between the first-stage pressure reducing valve and the second-stage pressure reducing valve.

10. The pressure reducing combination valve according to claim 1, characterized in that: The protrusion 1, the protrusion 2 and the main body are made of titanium alloy material to form an integral structure.

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