CN114718769A - High-pressure fluid multistage pressure reduction device - Google Patents
High-pressure fluid multistage pressure reduction device Download PDFInfo
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- CN114718769A CN114718769A CN202210357747.7A CN202210357747A CN114718769A CN 114718769 A CN114718769 A CN 114718769A CN 202210357747 A CN202210357747 A CN 202210357747A CN 114718769 A CN114718769 A CN 114718769A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/96—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by specially adapted arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/56—Control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02754—Throttle passages using a central core throttling the passage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention belongs to a pressure reduction device and a debugging system, and provides a high-pressure fluid multistage pressure reduction device which comprises a shell and an inner core which are coaxially arranged, in order to solve the technical problems that when the high-pressure large-flow fluid is reduced in pressure, a multistage pore plate pressure reduction mode is mostly adopted, and the arrangement of a pressure reduction pipeline and the large workload of disassembly and assembly are not facilitated. The casing is the hollow structure that both ends opening set up, and the casing both ends are used for connecting outside fluid line respectively. The inner core is fixedly arranged inside the shell. The shell is internally provided with a first-level throttling structure, a second-level throttling structure and a third-level throttling structure in sequence from the fluid inlet end to the fluid outlet end, and the first-level throttling structure, the second-level throttling structure and the third-level throttling structure are coaxially arranged outside the inner core and used for throttling flowing fluid in sequence. And expansion cavities are arranged in the shell between the first-stage throttling structure and the second-stage throttling structure and between the second-stage throttling structure and the third-stage throttling structure and used for sequentially reducing the pressure of flowing fluid.
Description
Technical Field
The invention belongs to a pressure reduction device, and particularly relates to a high-pressure fluid multi-stage pressure reduction device.
Background
In a pump type liquid rocket engine semi-system test, the pressure of an engine propellant after pumping can reach more than 10MPa, the pressure of a high-pressure propellant after pumping of the engine needs to be reduced from more than 10MPa to less than 1MPa, and the high-pressure propellant flows back to a recovery container.
At present, for the pressure reduction of high-pressure large-flow fluid, in order to prevent cavitation of the fluid, a multi-stage orifice plate pressure reduction mode is mostly adopted. When the method is adopted, the distance between the pore plates at all levels needs to be more than 10 times of the diameter of the pipeline, and the arrangement of the pressure reduction pipeline is not facilitated. Meanwhile, when the working condition of the engine changes, the size of the pressure reduction pore plate needs to be adjusted, and the workload of disassembly and assembly is large.
Disclosure of Invention
The invention provides a high-pressure fluid multi-stage pressure reducing device, aiming at solving the technical problems that when the high-pressure large-flow fluid is reduced in pressure, a multi-stage pore plate pressure reducing mode is mostly adopted, the space between pore plates at all stages is large, the arrangement of a pressure reducing pipeline is not facilitated, and the size of a pressure reducing pore plate is adjusted, the workload is large when the working condition of an engine is changed.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-pressure fluid multistage pressure reduction device is characterized by comprising a shell and an inner core which are coaxially arranged;
the shell is of a hollow structure with openings at two ends, and the two ends of the shell are respectively used for connecting external fluid pipelines;
the inner core is fixedly arranged in the shell;
the shell is internally provided with a primary throttling structure, a secondary throttling structure and a tertiary throttling structure in sequence from the fluid inlet end to the fluid outlet end, and the primary throttling structure, the secondary throttling structure and the tertiary throttling structure are coaxially arranged outside the inner core and are used for sequentially throttling the flowing fluid;
and expansion cavities are arranged in the shell between the first-stage throttling structure and the second-stage throttling structure and between the second-stage throttling structure and the third-stage throttling structure and used for sequentially reducing the pressure of flowing fluid.
Furthermore, the first-stage throttling structure and the third-stage throttling structure are both annular plates, the outer edges of the annular plates are connected with the inner wall of the shell, and a gap is reserved between the inner hole and the inner core.
Furthermore, a throttling boss is arranged on the inner wall of the shell along the circumferential direction to form a secondary throttling structure;
a gap is reserved between the throttling boss and the inner core.
Furthermore, the size of a gap between the first-stage throttling structure and the inner core, a gap between the second-stage throttling structure and the inner core and a gap between the third-stage throttling structure and the inner core are sequentially increased.
Further, the effective flow area of the first-level throttling structure, the second-level throttling structure and the third-level throttling structure all satisfy the following formula:
wherein Q ismRepresents the flow rate; c represents a flow coefficient; piThe pressure drop of the throttling structure is represented, i represents the stage number of the throttling structure, and i is 1,2 and 3;ρ represents the fluid density; a. the0Representing the effective flow area of the throttling structure.
Furthermore, the device also comprises an inlet pressure plate and an outlet pressure plate which are positioned in the shell and are coaxial with the shell;
the inlet pressing plate and the outlet pressing plate are sleeved outside the inner core and connected with the inner core, and flow channels through which fluid flows are arranged on the inlet pressing plate and the outlet pressing plate;
the inlet pressure plate is positioned at one side of the first-stage throttling structure close to the inlet end, the outlet pressure plate is positioned at one side of the third-stage throttling structure close to the outlet end,
a first limiting step and a second limiting step are arranged inside the shell;
the first-stage throttling structure is pressed on the first limiting step through the inlet pressing plate, and the third-stage throttling structure is pressed on the second limiting step through the outlet pressing plate.
Further, the inlet pressure plate comprises a first part and a second part coaxially sleeved outside the first part;
the first part and the second part are both hollow columns, the first part and the second part are connected through four supporting pieces which are uniformly distributed along the circumferential direction, a flow passage for fluid to flow through is formed between every two adjacent supporting pieces, and the inner core is arranged in an inner hole of the first part;
the second part is close to the bottom surface of the primary throttling structure and is provided with a circumferential bulge along the outer edge, and the circumferential bulge is abutted against the end face of the primary throttling structure and used for pressing the primary throttling structure onto the first limiting step.
Further, the outlet pressing plate and the inlet pressing plate are identical in structure and are arranged in a mirror symmetry mode relative to the axial center of the inner core.
Furthermore, the inner core is provided with flow guide steps in the two expansion cavities for guiding the flow in the expansion cavities.
The first and second components are of unitary construction.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the existing multi-stage pressure reducing orifice plate mode, the multi-stage pressure reducing device for the high-pressure fluid combines multi-stage pressure reducing into a whole in a three-stage throttling and three-stage pressure reducing mode, so that the volume of the pressure reducing device is smaller, and the arrangement of a pressure reducing pipeline is facilitated. In addition, the one-level throttling structure, the second-level throttling structure and the third-level throttling structure of different sizes can be matched with the inner core, so that the flow and the pressure reduction capacity can be adjusted, and the adjustable throttling structure can be suitable for different working conditions. The high-pressure fluid multi-stage pressure reduction device is debugged and verified by tests, can be applied to pump pressure type liquid rocket engine semi-system tests, and has good application effect.
2. The first-stage throttling structure and the third-stage throttling structure are both annular plates, the second-stage throttling structure is a throttling boss arranged on the inner wall of the shell along the circumferential direction, and the first-stage throttling structure and the third-stage throttling structure are simple in structure and convenient to process, disassemble and assemble.
3. In the invention, the gaps between each stage of throttling structure and the inner core are sequentially increased along the flowing direction of the fluid and are matched with the specific condition that the fluid is depressurized along with the throttling structure and the corresponding expansion cavity.
4. The effective flow area of each stage of throttling structure can be determined by a formula, and in the practical application process, the throttling structures, the expansion cavities and the gap sizes of each stage can be designed according to the practical working conditions, so that the device disclosed by the invention can meet various different working conditions.
5. According to the invention, the first-stage throttling structure and the third-stage throttling structure are respectively pressed on the two limiting steps in the shell through the inlet pressing plate and the outlet pressing plate, so that the engine is convenient to disassemble and assemble when the working condition change of the engine needs to be adjusted, and the production efficiency can be effectively improved.
6. The flow guide step is arranged on the inner core, so that the flow guide of the fluid in the expansion cavity can be realized, and the flow field distribution of the fluid in the expansion cavity is more uniform.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a high-pressure fluid multi-stage pressure reduction device according to the present invention (arrows indicate fluid flow directions);
FIG. 2 is a schematic structural view of the housing of FIG. 1;
FIG. 3 is a left side view of the inlet platen of FIG. 1;
fig. 4 is a schematic diagram of a debugging system for performing debugging verification according to an embodiment of the present invention.
The high-pressure fluid expansion valve comprises a shell 1, an inner core 2, a primary throttling structure 3, a secondary throttling structure 4, a tertiary throttling structure 5, an expansion cavity 6, an inlet pressure plate 7, a first part 701, a second part 702, a support 703, an outlet pressure plate 8, a first limiting step 9, a second limiting step 10, a flow channel 11, a circumferential bulge 12, a high-pressure fluid multi-stage pressure reduction device 13, a high-pressure propellant supply system 14, a first high-pressure valve 15, a second high-pressure valve 16, a variable diameter pipeline 17, a flow guide step 18, a flange 19-DN100 and a pipeline 20-DN 50.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments do not limit the present invention.
In order to solve the defects of multiple use in the conventional pressure reduction mode by adopting a multi-stage orifice plate, the invention designs the flow-adjustable high-pressure fluid multi-stage pressure reduction device, which can reduce the high-pressure propellant (more than 10 MPa) after the engine pump to below 1MPa through multi-stage pressure reduction, simultaneously has the advantages of small occupied space and adjustable flow, and can realize the quick recovery of the propellant after the rocket engine test pump.
As shown in fig. 1, the high-pressure fluid multistage pressure reduction device comprises a casing 1, an inner core 2, an inlet pressure plate 7, an outlet pressure plate 8, a first-stage throttling structure 3, a second-stage throttling structure 4 and a third-stage throttling structure 5 which are coaxially arranged. The casing 1 is a hollow structure with openings at two ends, the two ends of the casing 1 are respectively connected with fluid inlet and outlet pipelines, flanges can be respectively arranged at the two ends of the casing 1, and the casing is connected with an external pipeline through the flanges. The two ends of the inner core 2 respectively penetrate through the inlet pressing plate 7 and the outlet pressing plate 8, the inner core 2 is in threaded connection with the inlet pressing plate 7 and the inner core 2 is in threaded connection with the outlet pressing plate 8, and the two ends of the inner core 2 are located outside the inlet pressing plate 7 and the outlet pressing plate 8 and are provided with bolts and gaskets, so that the inlet pressing plate 7 and the outlet pressing plate 8 are both in tight connection with the inner core 2.
The first-stage throttling structure 3, the second-stage throttling structure 4 and the third-stage throttling structure 5 are sequentially arranged from the fluid inlet end to the fluid outlet end inside the shell 1, and the first-stage throttling structure 3, the second-stage throttling structure 4 and the third-stage throttling structure 5 are coaxially arranged outside the inner core 2 and used for sequentially throttling flowing fluid. In the embodiment of the invention shown in fig. 1, the primary throttling structure 3 and the tertiary throttling structure 5 are both annular plates, and the inner hole of the annular plate serving as the primary throttling structure 3 and the inner hole of the annular plate serving as the tertiary throttling structure 5 both have a gap with the inner core 2, so that when a fluid flows through the gap, the fluid is throttled. The inner wall of the shell 1 is circumferentially provided with a throttling boss to form a secondary throttling structure 4, and a gap is reserved between the throttling boss and the inner core 2 to throttle the fluid. The inlet pressing plate 7 is located on one side, close to the inlet end, of the one-level throttling structure 3, the outlet pressing plate 8 is located on one side, close to the outlet end, of the three-level throttling structure 5, as shown in fig. 2, a first limiting step 9 and a second limiting step 10 are arranged inside the shell 1, the one-level throttling structure 3 is pressed on the first limiting step 9 through the inlet pressing plate 7, and the three-level throttling structure 5 is pressed on the second limiting step 10 through the outlet pressing plate 8. In addition, the inlet platen 7 and the outlet platen 8 are each provided with a flow passage 11 through which a fluid flows.
With respect to the arrangement of the flow channels 11, as shown in fig. 3, the inlet platen 7 preferably comprises a first member 701 and a second member 702 coaxially disposed over the first member 701. The first part 701 and the second part 702 are both hollow columnar, the first part 701 and the second part 702 are connected through four supporting pieces 703 which are uniformly distributed along the circumferential direction, a flow passage 11 for flowing fluid is formed between the adjacent supporting pieces 703, and an inner core 2 is arranged in an inner hole of the first part 701. The second part 702 is provided with a circumferential protrusion 12 along the outer edge thereof near the bottom surface of the primary throttling structure 3, and the circumferential protrusion 12 abuts against the end surface of the primary throttling structure 3 and is used for pressing the primary throttling structure 3 onto the first limiting step 9. In addition, the circumferential bulge 12 is arranged to leave a gap between the inlet pressure plate 7 and the primary throttling structure 3, so that the fluid can pass through the gap conveniently.
The first member 701 and the second member 702 may be of a one-piece structure or a split structure. The above is only one preferred configuration of the inlet platen 7, and the inlet platen may have another configuration as long as it can fix the primary throttle structure 3 and allow the fluid to pass therethrough.
For convenience of processing and installation, the structure of the outlet pressure plate 8 may be the same as that of the inlet pressure plate 7, and may also be in other structural forms, similarly, as long as the tertiary throttling structure 5 can be fixed and can be used for fluid to flow through.
The shell 1 is internally provided with expansion cavities 6 between the first-stage throttling structure 3 and the second-stage throttling structure 4 and between the second-stage throttling structure 4 and the third-stage throttling structure 5, namely, after the fluid is throttled by the first-stage throttling structure 3, the second-stage throttling structure 4 and the third-stage throttling structure 5, the fluid flowing through the expansion cavities 6 formed by the containing cavities in the shell 1 on the rear side of the expansion cavities is sequentially depressurized.
In addition, the size of the gap between the first-stage throttling structure 3 and the inner core 2, the gap between the second-stage throttling structure 4 and the inner core 2 and the gap between the third-stage throttling structure 5 and the inner core 2 can be set to be sequentially increased, and the requirements of gradual throttling and pressure reduction of fluid are met.
When the high-pressure fluid multistage pressure reduction device 13 is used for pressure reduction, high-pressure fluid firstly throttles for the first time through a gap between the inner core 2 and the primary throttling structure 3 and expands in a space of the expansion cavity 6 at the rear side of the primary throttling structure 3 to realize primary pressure reduction, then throttles for the second time through a gap between the inner core 2 and the secondary throttling structure 4 and expands in a space of the expansion cavity 6 at the rear side of the secondary throttling structure 4 to realize secondary pressure reduction, the fluid of the inner core 2 and the tertiary throttling structure 5 throttles for the third time, and the fluid completes tertiary pressure reduction after flowing through the outlet pressure plate 8.
As a preferable scheme, the flow guiding steps 18 are arranged on the inner core 2 at two sides of the secondary throttling structure 4, and also at portions located in the two expansion cavities 6, so that the flow of the fluid in the expansion cavities 6 can be guided, and the flow field distribution of the fluid in the expansion cavities 6 is more uniform.
According to the invention, the pressure reduction capacity and the flow of the pressure reduction device can be adjusted by replacing the inner core 2 and adjusting the flow areas of the primary throttling structure 3, the secondary throttling structure 4 and the tertiary throttling structure 5.
The flow areas of the first-level throttling structure 3, the second-level throttling structure 4 and the third-level throttling structure 5 all satisfy the following formula:
wherein QmRepresents the flow rate; c represents a flow coefficient; piThe pressure drop of the throttling structure is represented, i represents the stage number of the throttling structure, and i is 1,2 and 3; ρ represents the fluid density; a. the0Representing the effective flow area of the throttling structure.
The calculation results under the target working conditions (12.1MPa, 82.66kg/s) are exemplified in table 1, wherein the pressure drop of each stage is smaller than the blocking pressure of cavitation generated by the throttling structure of the stage, the flow area of the throttling structure of each stage is calculated by formula 1, and the corresponding inner core diameter of the throttling structure of each stage can be obtained.
TABLE 1 target condition corresponding parameter Table
Referring to fig. 4, the high-pressure fluid multi-stage pressure reduction device 13 of the present invention is connected to a commissioning system for commissioning verification. DN100 flange 19 of high pressure propellant supply system 14 exit end is back-connected DN50 pipeline 20, DN100 flange 19 and DN50 pipeline 20 are connected through reducing pipeline 17, reducing pipeline 17 big end is towards DN100 flange 19, the tip is towards DN50 pipeline 20, DN50 pipeline 20 is last to be equipped with parallelly connected first high-pressure valve 15 and second high-pressure valve 16 that set up, first high-pressure valve 15 and second high-pressure valve 16 all adopt DN50/23MPa high-pressure valve, debug the on-off valve before high pressure fluid multistage pressure reduction device 13 entry, all open first high-pressure valve 15 and second high-pressure valve 16 when the fluid steps down, can reduce the shutdown water hammer under the large-traffic through closing the valve in grades. The first high-pressure valve 15 and the second high-pressure valve 16 are connected with the inlet end of the high-pressure fluid multi-stage pressure reduction device 13 through the reducing pipeline 17, the large end of the reducing pipeline 17 is arranged towards the high-pressure fluid multi-stage pressure reduction device 13, the inner diameter of the small end of the reducing pipeline 17 is matched with the inner diameter of the first high-pressure valve 15 and the inner diameter of the second high-pressure valve 16, and the inner diameter of the large end is matched with the inner diameter of the inlet end of the high-pressure fluid multi-stage pressure reduction device 13.
During debugging, the pressure at the inlet end of the high-pressure fluid multistage pressure reduction device 13 is 12MPa, the flow rate is 92.8kg/s, softened water is used as a debugging medium, and pressure measuring points are arranged after pressure reduction of each stage of the high-pressure fluid multistage pressure reduction device 13. Through debugging and verification, the pressure at the outlet end of the high-pressure fluid multistage pressure reduction device 13 can meet the requirement of reducing the pressure of the propellant after the test pump of the rocket engine and recovering the propellant, and the pressure of the high-pressure fluid can be reduced to be lower than 1MPa, so that the design target is achieved.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A high-pressure fluid multistage pressure reduction device is characterized in that: comprises a shell (1) and an inner core (2) which are coaxially arranged;
the shell (1) is of a hollow structure with openings at two ends, and two ends of the shell (1) are respectively used for connecting external fluid pipelines;
the inner core (2) is fixedly arranged in the shell (1);
a primary throttling structure (3), a secondary throttling structure (4) and a tertiary throttling structure (5) are sequentially arranged in the shell (1) along the fluid inlet end to the fluid outlet end, and the primary throttling structure (3), the secondary throttling structure (4) and the tertiary throttling structure (5) are coaxially arranged outside the inner core (2) and are used for sequentially throttling the flowing fluid;
the shell (1) is internally provided with an expansion cavity (6) between the first-stage throttling structure (3) and the second-stage throttling structure (4) and between the second-stage throttling structure (4) and the third-stage throttling structure (5) for sequentially reducing the pressure of flowing fluid.
2. The high-pressure fluid multistage pressure reducing apparatus according to claim 1, wherein: the one-level throttling structure (3) and the three-level throttling structure (5) are both annular plates, the outer edges of the annular plates are connected with the inner wall of the shell (1), and gaps are reserved between the inner holes and the inner core (2).
3. The high-pressure fluid multistage pressure reducing device according to claim 2, wherein: a throttling boss is arranged on the inner wall of the shell (1) along the circumferential direction to form the secondary throttling structure (4);
a gap is reserved between the throttling boss and the inner core (2).
4. A high-pressure fluid multistage pressure reducing apparatus according to claim 2 or 3, wherein: the size of the gap between the primary throttling structure (3) and the inner core (2), the gap between the secondary throttling structure (4) and the inner core (2) and the size of the gap between the tertiary throttling structure (5) and the inner core (2) are sequentially increased.
5. The high-pressure fluid multistage pressure reducing device according to claim 4, wherein:
the effective flow area of the first-level throttling structure (3), the second-level throttling structure (4) and the third-level throttling structure (5) all satisfy the following formula:
wherein Q ismRepresents the flow rate; c represents a flow coefficient; piThe pressure drop of the throttling structure is represented, i represents the stage number of the throttling structure, and i is 1,2 and 3; ρ represents the fluid density; a. the0Representing the effective flow area of the throttling structure.
6. The high-pressure fluid multistage pressure reducing device according to claim 5, wherein: the device also comprises an inlet pressure plate (7) and an outlet pressure plate (8) which are positioned in the shell (1) and are coaxial with the shell (1);
the inlet pressing plate (7) and the outlet pressing plate (8) are sleeved outside the inner core (2) and connected with the inner core (2), and flow channels (11) through which fluid flows are arranged on the inlet pressing plate (7) and the outlet pressing plate (8);
the inlet pressure plate (7) is positioned at one side of the first-stage throttling structure (3) close to the inlet end, the outlet pressure plate (8) is positioned at one side of the third-stage throttling structure (5) close to the outlet end,
a first limiting step (9) and a second limiting step (10) are arranged inside the shell (1);
the primary throttling structure (3) is pressed on the first limiting step (9) through the inlet pressing plate (7), and the tertiary throttling structure (5) is pressed on the second limiting step (10) through the outlet pressing plate (8).
7. The high-pressure fluid multistage pressure reducing device according to claim 6, wherein: the inlet pressure plate (7) comprises a first part (701) and a second part (702) which is coaxially sleeved outside the first part (701);
the first component (701) and the second component (702) are both hollow columnar, the first component (701) and the second component (702) are connected through four supporting pieces (703) which are uniformly distributed along the circumferential direction, a flow channel (11) for fluid to flow is formed between the adjacent supporting pieces (703), and the inner core (2) is arranged in an inner hole of the first component (701);
the second part (702) is close to the bottom surface of the primary throttling structure (3) and is provided with a circumferential bulge (12) along the outer edge of the bottom surface, the circumferential bulge (12) is abutted to the end surface of the primary throttling structure (3) and used for pressing the primary throttling structure (3) on the first limiting step (9).
8. The high-pressure fluid multistage pressure reducing device according to claim 7, wherein: the outlet pressing plate (8) and the inlet pressing plate (7) are identical in structure and are arranged in mirror symmetry relative to the axial center of the inner core (2).
9. The high-pressure fluid multistage pressure reducing device according to claim 8, wherein:
flow guide steps (18) are arranged in the two expansion cavities (6) on the inner core (2) and are used for guiding the fluid in the expansion cavities (6);
the first part (701) and the second part (702) are of a one-piece structure.
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| CN202210357747.7A CN114718769B (en) | 2022-04-06 | 2022-04-06 | Multistage pressure reducing device for high-pressure fluid |
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| CN202210357747.7A CN114718769B (en) | 2022-04-06 | 2022-04-06 | Multistage pressure reducing device for high-pressure fluid |
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| CN109505988A (en) * | 2018-12-07 | 2019-03-22 | 华润电力（贺州）有限公司 | A kind of high-pressure multi-stage pressure reducing valve |
| US20200018406A1 (en) * | 2018-07-12 | 2020-01-16 | Fisher Controls International Llc | Monolithic, Non-Plugging Multi-Stage Valve Trim |
| CN215293644U (en) * | 2021-06-04 | 2021-12-24 | 艾坦姆流体控制技术(山东)有限公司 | Series multi-stage cage type regulating valve |
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2022
- 2022-04-06 CN CN202210357747.7A patent/CN114718769B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102954226A (en) * | 2011-08-18 | 2013-03-06 | 孙杰 | Pressure-reducing throttling valve |
| CN206309972U (en) * | 2016-12-19 | 2017-07-07 | 天津精通控制仪表技术有限公司 | A kind of Cascade Multistage decompression high-differential-pressure regulating valve |
| US20200018406A1 (en) * | 2018-07-12 | 2020-01-16 | Fisher Controls International Llc | Monolithic, Non-Plugging Multi-Stage Valve Trim |
| CN109505988A (en) * | 2018-12-07 | 2019-03-22 | 华润电力（贺州）有限公司 | A kind of high-pressure multi-stage pressure reducing valve |
| CN215293644U (en) * | 2021-06-04 | 2021-12-24 | 艾坦姆流体控制技术(山东)有限公司 | Series multi-stage cage type regulating valve |
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| Publication number | Publication date |
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| CN114718769B (en) | 2023-08-22 |
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