CN117386830A - Quick response pneumatic needle valve suitable for pulse wind tunnel and application method thereof - Google Patents
Quick response pneumatic needle valve suitable for pulse wind tunnel and application method thereof Download PDFInfo
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- CN117386830A CN117386830A CN202311711596.1A CN202311711596A CN117386830A CN 117386830 A CN117386830 A CN 117386830A CN 202311711596 A CN202311711596 A CN 202311711596A CN 117386830 A CN117386830 A CN 117386830A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims description 31
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
- F16K1/38—Valve members of conical shape
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
Abstract
The invention belongs to the technical field of pulse wind tunnel tests, and discloses a quick response pneumatic needle valve suitable for a pulse wind tunnel and a use method thereof. The valve body of the quick response pneumatic needle valve is internally provided with an upper ejector rod and a valve rod from top to bottom in sequence, and the upper ejector rod is connected with the valve body through threads and is positioned through a fastening nut. The upper cylinder and the lower cylinder can respond quickly as the switch of the quick-response pneumatic needle valve, so that the opening and closing are realized. The upper ejector rod is in threaded fit with the valve body, the upper limit of the valve rod can be adjusted by rotating the upper ejector rod, the top surface of the upper ejector rod is provided with an indexing rotation angle scale, the matching surface of the upper ejector rod and the fastening nut is provided with a rotation number scale, the matching thread lead can accurately control the valve opening of the quick-response pneumatic needle valve, and the flow is controllable. The using method is quick in response, simple to operate and good in application prospect in the pulse wind tunnel.
Description
Technical Field
The invention belongs to the technical field of pulse wind tunnel tests, and particularly relates to a quick response pneumatic needle valve suitable for a pulse wind tunnel and a use method thereof.
Background
The pulse wind tunnel can simulate the physicochemical process of the bypass flow field in the ultra-high speed flight process of the aircraft more truly, however, the effective test time of the pulse wind tunnel is only in the order of ms. The pulse wind tunnel is used for carrying out direct connection tests, jet flow tests, super-combustion tests and other tests, and the following conditions are needed: 1. ensuring that fuel or other gaseous medium injection is synchronous with pulse wind tunnel start, and requiring a fuel injection switch to have quick response capability after a pulse wind tunnel start signal is given; 2. the injected fuel (gas or liquid) and the pulse wind tunnel incoming flow keep a certain proportion, the pulse wind tunnel incoming flow is relatively determined after the flow field adjustment is finished, and the flow of the injected fuel or other gaseous mediums must be precisely controlled.
Currently, there is a need to develop a fast response pneumatic needle valve suitable for pulse wind tunnels and methods of use thereof.
Disclosure of Invention
The invention aims to provide a quick response pneumatic needle valve suitable for a pulse wind tunnel, and the other technical problem to be solved by the invention is to provide a use method of the quick response pneumatic needle valve suitable for the pulse wind tunnel.
The invention relates to a quick response pneumatic needle valve suitable for a pulse wind tunnel, which is characterized in that the quick response pneumatic needle valve is arranged on a gas pipeline, and the applicable pressure range is 0.1-20 MPa; the valve body center cavity of the quick response pneumatic needle valve is internally provided with an upper ejector rod and a valve rod from top to bottom in sequence, and the upper ejector rod is connected with the valve body through threads and positioned through a fastening nut;
the valve body is a step pipe body; the upper section of the inner cavity is an internal thread, the middle section of the inner cavity is a cylinder cavity, the lower section of the inner cavity is a valve rod cavity, and the inner diameter of the cylinder cavity is larger than that of the valve rod cavity; the outer diameter of the upper section of the valve body is smaller than that of the lower section of the valve body, the lower section of the valve body is sequentially provided with an air inlet A and an air outlet B which are communicated with the air pipeline from top to bottom, the air inlet A is positioned on the left side, and the air outlet B is positioned on the right side;
the upper ejector rod is a step cylinder; the top end is a rotating head for holding and rotating the upper ejector rod, and the position of the upper ejector rod is adjusted; the middle section is an external thread section and is used for matching with the internal thread of the upper section of the valve body; the lower section is a sealing adjusting section, a spring, an upper gasket, a first sealing element and a lower gasket are sleeved in sequence from top to bottom, the spring provides pretightening force for the upper ejector rod, and the first sealing element is used for sealing between the upper ejector rod and the valve body;
the valve rod is also a step cylinder; the top end is inserted into the lower end of the upper ejector rod; the middle section protrudes to form a piston, the piston divides the cylinder cavity into an upper cylinder and a lower cylinder, a second sealing piece is arranged on the piston and used for isolating and sealing the upper cylinder and the lower cylinder, and the upper cylinder and the lower cylinder are respectively provided with a through hole connected with a pneumatic control valve; the lower section is a needle-shaped rod body which is matched with the valve rod cavity and is provided with a third sealing piece, and the third sealing piece is used for isolating and sealing the lower cylinder and the gas pipeline; the conical needle at the tail end penetrates through the air inlet A and the air outlet B, the conical needle is pressed downwards to form conical surface sealing to isolate the air inlet A from the air outlet B, the conical needle is lifted upwards to be communicated with the air inlet A and the air outlet B, and the lifting position of the conical needle controls the air inlet flow between the air inlet A and the air outlet B.
Further, the pneumatic control valve is a 2-position 3-pneumatic control valve, and the control gas pressure of the pneumatic control valve is smaller than the gas pressure in the gas pipeline.
Further, the inner diameters of the air inlet A and the air outlet B are D, the outer diameter of the conical needle of the valve rod at the position where the conical needle forms conical surface seal is D1, the outer diameter of the front end of the conical needle of the valve rod is D2, and the requirements of D2=D12-D22 are met; the stroke of the valve rod is h.
Further, the top surface of the upper ejector rod is provided with an indexed rotation angle scale, and the rotation angle of the rotating head is checked through the rotation angle scale.
Further, the matching surface of the upper ejector rod and the fastening nut is provided with a rotation number scale, and the rotation number of the rotating head is checked through the rotation number scale.
The invention relates to a use method of a quick response pneumatic needle valve suitable for a pulse wind tunnel, which comprises the following steps:
s10, the upper ejector rod is positioned at the lower stop position, the fastening nut is in a screwing state, the upper ejector rod presses the valve rod, the valve rod moves downwards, and the air inlet A and the air outlet B are separated through the conical surface matched with the needle-shaped rod body and the valve rod cavity;
s20, filling operating gas into the upper cylinder through the upper through hole to further compress the valve rod;
s30, loosening the fastening nut, calculating the required rotation number and rotation angle of the upper ejector rod to a preset ventilation position according to ventilation amount, and rotating the rotating head in place;
s40, tightening the fastening nut, sending a start trigger signal to a quick response pneumatic needle valve by a pulse wind tunnel, discharging operating gas by an upper cylinder, filling the operating gas by a lower cylinder, moving a valve rod upwards, and connecting an air inlet A with an air outlet B;
s50, corresponding to test time of ms magnitude of a pulse wind tunnel, the pulse wind tunnel sends a closing trigger signal to a quick response pneumatic needle valve, an upper cylinder is filled with operating gas, a lower cylinder discharges the operating gas, a valve rod moves downwards, and the air inlet A and the air outlet B are separated through conical surfaces matched with a cavity of the valve rod.
The quick response pneumatic needle valve suitable for the pulse wind tunnel has the following characteristics:
a. the upper cylinder and the lower cylinder of the valve body respectively adopt 1 pneumatic control valve with 2 bits and 3 communication as a control signal of the main valve, the response capacity is ms order, the sealing is reliable, and the control signal is simple;
b. the upper cylinder is an adjustable cavity, the upper surface of the ejector rod is provided with an indexing rotation scale, the matching surface of the ejector rod and the fastening nut is provided with a rotation circle scale, the valve opening of the quick-response pneumatic needle valve can be accurately controlled by matching with the lead of the thread, and the flow is controllable.
In summary, the quick response pneumatic needle valve suitable for the pulse wind tunnel, provided by the invention, has the advantages that the upper cylinder and the lower cylinder can be used as the switch of the needle valve to quickly respond, the opening and closing of the quick response pneumatic needle valve are realized, the response capacity of the quick response pneumatic needle valve can be improved by adjusting the air pressure of the upper cylinder and the lower cylinder, the quick response pneumatic needle valve is simple in structure, and the response capacity is in the order of ms; the upper ejector rod is in threaded fit with the valve body, the upper ejector rod can be rotated to adjust the upper limit of the valve rod, the upper surface of the upper ejector rod is provided with an indexing rotary scale, the matching surface of the upper ejector rod and the fastening nut is provided with a rotating circle number scale, the valve opening of the quick-response pneumatic needle valve can be accurately controlled by the lead of the matched threads, and the flow is controllable. The use method of the quick response pneumatic needle valve suitable for the pulse wind tunnel has the advantages of quick response, simple operation and good application prospect in the pulse wind tunnel.
Drawings
FIG. 1 is a schematic diagram of a fast response pneumatic needle valve suitable for use in a pulse tunnel of the present invention;
FIG. 2 is an enlarged view of a portion of a valve body of the present invention for use in a rapid response pneumatic needle valve for a pulse tunnel;
FIG. 3 is a schematic view of the indexing rotary scale of the upper surface of the upper ejector rod in the fast response pneumatic needle valve suitable for the pulse wind tunnel;
FIG. 4 is a schematic diagram of the upper ejector rod rotation circle scale in the fast response pneumatic needle valve suitable for the pulse wind tunnel;
FIG. 5 is a schematic diagram of the installation of the fast response pneumatic needle valve of the present invention in a pulse tunnel.
In the figure, 1. An upper ejector rod; 2. a fastening nut; 3. a spring; 4. a gasket is arranged on the upper part; 5. a first seal; 6. a lower gasket; 7. an upper cylinder; 8. a lower cylinder; 9. a valve body; 10. a valve stem; 11. a second seal; 12. a third seal; 13. a high pressure section; 14. a low pressure section; 15. a membrane; 16. triggering a sensor; 17. a spray pipe; 18. a quick response pneumatic needle valve; 19. a test section; 20. a model; 21. manipulating the gas; 22. and (5) testing gas.
Detailed Description
The invention is described in detail below with reference to the drawings and examples.
As shown in fig. 1 and 2, the quick response pneumatic needle valve suitable for the pulse wind tunnel is arranged on a gas pipeline, and the applicable pressure range is 0.1-20 MPa; the valve body 9 of the quick response pneumatic needle valve 18 is internally provided with an upper ejector rod 1 and a valve rod 10 in sequence from top to bottom, and the upper ejector rod 1 is connected with the valve body 9 through threads and positioned through a fastening nut 2;
the valve body 9 is a step pipe body; the upper section of the inner cavity is an internal thread, the middle section of the inner cavity is a cylinder cavity, the lower section of the inner cavity is a valve rod cavity, and the inner diameter of the cylinder cavity is larger than that of the valve rod cavity; the outer diameter of the upper section of the valve body 9 is smaller than that of the lower section of the valve body 9, the lower section of the valve body 9 is sequentially provided with an air inlet A and an air outlet B which are communicated with an air pipeline from top to bottom, the air inlet A is positioned on the left side, and the air outlet B is positioned on the right side;
the upper ejector rod 1 is a step cylinder; the top end is a rotating head used for holding and rotating the upper ejector rod 1, and adjusting the position of the upper ejector rod 1; the middle section is an external thread section and is used for matching with the internal thread of the upper section of the valve body 9; the lower section is a sealing adjusting section, a spring 3, an upper gasket 4, a first sealing element 5 and a lower gasket 6 are sleeved in sequence from top to bottom, the spring 3 provides pretightening force for the upper ejector rod 1, and the first sealing element 5 is used for sealing between the upper ejector rod 1 and the valve body 9;
the valve rod 10 is also a stepped cylinder; the top end is inserted into the lower end of the upper ejector rod 1; the middle section protrudes to form a piston, the piston divides the cylinder cavity into an upper cylinder 7 and a lower cylinder 8, a second sealing piece 11 is arranged on the piston and used for isolating and sealing the upper cylinder 7 and the lower cylinder 8, and the upper cylinder 7 and the lower cylinder 8 are respectively provided with a through hole connected with a pneumatic control valve; the lower section is a needle-shaped rod body which is matched with the valve rod cavity, a third sealing piece 12 is arranged, and the third sealing piece 12 is used for isolating and sealing the lower cylinder 8 and the gas pipeline; the conical needle at the tail end penetrates through the air inlet A and the air outlet B, the conical needle is pressed downwards to form conical surface sealing to isolate the air inlet A from the air outlet B, the conical needle is lifted upwards to be communicated with the air inlet A and the air outlet B, and the lifting position of the conical needle controls the air inlet flow between the air inlet A and the air outlet B.
Further, the pneumatic control valve is a 2-position 3-pneumatic control valve, and the control gas pressure of the pneumatic control valve is smaller than the gas pressure in the gas pipeline.
Further, the inner diameters of the air inlet A and the air outlet B are D, the outer diameter of the conical needle of the valve rod 10 at the position where the conical surface is sealed is D1, and the outer diameter of the front end of the conical needle of the valve rod 10 is D2, so that d2=d12-D22 is satisfied; the valve stem 10 has a stroke h.
Further, as shown in fig. 3, the top surface of the upper ejector rod 1 is provided with an indexed rotation angle scale, and the rotation angle of the rotating head is checked through the rotation angle scale.
Further, as shown in fig. 4, the matching surface of the upper ejector rod 1 and the fastening nut 2 is provided with a rotation number scale, and the rotation number of the rotating head is checked through the rotation number scale.
The invention relates to a use method of a quick response pneumatic needle valve suitable for a pulse wind tunnel, which comprises the following steps:
s10, the upper ejector rod 1 is positioned at a lower stop position, the fastening nut 2 is in a screwing state, the upper ejector rod 1 presses the valve rod 10, the valve rod 10 moves downwards, and the air inlet A and the air outlet B are separated through conical surfaces matched with a needle-shaped rod body and a valve rod cavity;
s20, filling operating gas 21 into the upper cylinder 7 through a through hole above the upper cylinder to further compress the valve rod 10;
s30, loosening the fastening nut 2, calculating the required rotation number and rotation angle from the upper ejector rod 1 to a preset ventilation position according to ventilation amount, and rotating the rotating head in place;
s40, tightening the fastening nut 2, sending a starting trigger signal to the quick response pneumatic needle valve 18 by the pulse wind tunnel, discharging operating gas 21 by the upper cylinder 7, filling the operating gas 21 by the lower cylinder 8, moving the valve rod 10 upwards, and connecting the air inlet A with the air outlet B;
s50, corresponding to test time of a pulse wind tunnel ms magnitude, the pulse wind tunnel sends a closing trigger signal to the quick response pneumatic needle valve 18, the upper cylinder 7 is filled with operating gas 21, the lower cylinder 8 discharges the operating gas 21, the valve rod 10 moves downwards, and the air inlet A and the air outlet B are separated through conical surfaces of the needle-shaped rod body and the valve rod cavity.
Example 1:
the fast response pneumatic needle valve suitable for the pulse wind tunnel in the embodiment is used for a pulse wind tunnel engine model, as shown in fig. 5, the pulse wind tunnel comprises a high-pressure section 13, a low-pressure section 14, a spray pipe 17 and a test section 19 which are sequentially connected from front to back, a diaphragm 15 is arranged between the high-pressure section 13 and the low-pressure section 14, a model 20 is installed in the test section 19, a gas pipeline for conveying test gas 22 is arranged on the model 20, a fast response pneumatic needle valve 18 is arranged on the gas pipeline, a pneumatic control valve of the fast response pneumatic needle valve 18 is connected with control gas 21, the fast response pneumatic needle valve 18 is opened, and the test gas 22 enters the model 20.
Pulse wind tunnel operation Mach number 10, wind tunnel incoming flow is sensed from trigger sensor 16 through calculationThe started shock wave reaches the test section 19 for about 20ms, the effective test time is within 5ms, and the response time of the quick response pneumatic needle valve 18 is less than 25ms in order to meet the synchronization of the power fuel and the wind tunnel test; to meet the proper equivalence ratio, the flow rate of the quick response pneumatic needle valve 18 is calculated to be 25g/s, and the test gas 22 is H 2 The pressure was 12MPa, the temperature was 300K, and the opening area of the quick response air needle valve 18 was calculated to be 1.97mm 2 Meets the test requirement.
Although embodiments of the invention have been disclosed in the foregoing description and illustrated in the drawings, it will be understood by those skilled in the art that the present invention is not limited to the specific details and illustrations of features and steps set forth herein, and that all features of the invention disclosed, or steps of the method or process, except for mutually exclusive features and/or steps, may be combined in any manner without departing from the principles of the invention.
Claims (6)
1. The quick response pneumatic needle valve is suitable for a pulse wind tunnel and is characterized in that the quick response pneumatic needle valve (18) is arranged on a gas pipeline, and the applicable pressure range is 0.1-20 MPa; an upper ejector rod (1) and a valve rod (10) are sequentially arranged in a central cavity of a valve body (9) of the quick response pneumatic needle valve (18) from top to bottom, and the upper ejector rod (1) is connected with the valve body (9) through threads and positioned through a fastening nut (2);
the valve body (9) is a step pipe body; the upper section of the inner cavity is an internal thread, the middle section of the inner cavity is a cylinder cavity, the lower section of the inner cavity is a valve rod cavity, and the inner diameter of the cylinder cavity is larger than that of the valve rod cavity; the outer diameter of the upper section of the valve body (9) is smaller than that of the lower section of the valve body (9), the lower section of the valve body (9) is sequentially provided with an air inlet A and an air outlet B which are communicated with the air pipeline from top to bottom, the air inlet A is positioned on the left side, and the air outlet B is positioned on the right side;
the upper ejector rod (1) is a step cylinder; the top end is a rotating head used for holding and rotating the upper ejector rod (1) and adjusting the position of the upper ejector rod (1); the middle section is an external thread section and is used for matching with the internal thread of the upper section of the valve body (9); the lower section is a sealing adjusting section, a spring (3), an upper gasket (4), a first sealing piece (5) and a lower gasket (6) are sleeved in sequence from top to bottom, the spring (3) provides pretightening force for the upper ejector rod (1), and the first sealing piece (5) is used for sealing between the upper ejector rod (1) and the valve body (9);
the valve rod (10) is also a step cylinder; the top end is inserted into the lower end of the upper ejector rod (1); the middle section protrudes to form a piston, the piston divides the cylinder cavity into an upper cylinder (7) and a lower cylinder (8), a second sealing piece (11) is arranged on the piston and used for isolating and sealing between the upper cylinder (7) and the lower cylinder (8), and the upper cylinder (7) and the lower cylinder (8) are respectively provided with a through hole connected with a pneumatic control valve; the lower section is a needle-shaped rod body which is matched with the valve rod cavity, and a third sealing element (12) is arranged, and the third sealing element (12) is used for isolating and sealing the lower cylinder (8) and the gas pipeline; the conical needle at the tail end penetrates through the air inlet A and the air outlet B, the conical needle is pressed downwards to form conical surface sealing to isolate the air inlet A from the air outlet B, the conical needle is lifted upwards to be communicated with the air inlet A and the air outlet B, and the lifting position of the conical needle controls the air inlet flow between the air inlet A and the air outlet B.
2. The rapid response pneumatic needle valve for impulse tunnels of claim 1 wherein the pneumatic control valve is a 2-position 3-way pneumatic control valve, the control gas pressure of the pneumatic control valve being less than the gas pressure in the gas line.
3. The quick response pneumatic needle valve for pulse wind tunnel according to claim 1, wherein the inner diameters of the air inlet a and the air outlet B are D, the outer diameter of the conical needle of the valve rod (10) at the position where the conical needle forms the conical surface seal is D1, the outer diameter of the front end of the conical needle of the valve rod (10) is D2, and d2=d12-D22 is satisfied; the stroke of the valve rod (10) is h.
4. The quick response pneumatic needle valve for pulse wind tunnel according to claim 1, wherein the top surface of the upper ejector rod (1) is provided with a rotation angle scale with graduations, and the rotation angle of the rotating head is checked through the rotation angle scale.
5. The quick response pneumatic needle valve for pulse wind tunnel according to claim 1, wherein the matching surface of the upper ejector rod (1) and the fastening nut (2) is provided with a rotation number scale, and the rotation number of the rotating head is checked through the rotation number scale.
6. The use method of the quick response pneumatic needle valve suitable for the pulse wind tunnel is used for the quick response pneumatic needle valve suitable for the pulse wind tunnel as claimed in any one of claims 1 to 5, and is characterized by comprising the following steps:
s10, the upper ejector rod (1) is positioned at a lower stop position, the fastening nut (2) is in a screwing state, the upper ejector rod (1) presses the valve rod (10), the valve rod (10) moves downwards, and the air inlet A and the air outlet B are separated through conical surfaces matched with a needle-shaped rod body and a valve rod cavity;
s20, filling operating gas (21) into the upper cylinder (7) through a through hole above the upper cylinder to further compress the valve rod (10);
s30, loosening the fastening nut (2), calculating the required rotation number and rotation angle of the upper ejector rod (1) to a preset ventilation position according to ventilation amount, and rotating the rotating head in place;
s40, tightening the fastening nut (2), sending a start trigger signal to the quick response pneumatic needle valve (18) by the pulse wind tunnel, discharging the operating gas (21) by the upper cylinder (7), filling the operating gas (21) by the lower cylinder (8), moving the valve rod (10) upwards, and connecting the air inlet A with the air outlet B;
s50, corresponding to test time of a pulse wind tunnel ms magnitude, the pulse wind tunnel sends a closing trigger signal to a quick response pneumatic needle valve (18), an upper cylinder (7) is filled with operating gas (21), a lower cylinder (8) discharges the operating gas (21), a valve rod (10) moves downwards, and an air inlet A and an air outlet B are separated through conical surfaces matched with a valve rod cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311711596.1A CN117386830B (en) | 2023-12-13 | 2023-12-13 | Quick response pneumatic needle valve suitable for pulse wind tunnel and application method thereof |
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| CN202311711596.1A CN117386830B (en) | 2023-12-13 | 2023-12-13 | Quick response pneumatic needle valve suitable for pulse wind tunnel and application method thereof |
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| CN117386830B CN117386830B (en) | 2024-02-02 |
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| CN117386830B (en) | 2024-02-02 |
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