Quick-opening valve structure for explosive wave simulation device and control method of quick-opening valve structure

Abstract

The invention relates to the field of design of explosive wave simulation devices, and provides a quick-opening valve structure for an explosive wave simulation device in order to solve the problems that an existing quick-opening valve structure is long in opening time and the like, the quick-opening valve structure comprises a valve body, an air cylinder, a valve element and an air inlet / outlet pipe, and a high-pressure air chamber is formed between the inner wall of the valve body and the outer wall of the air cylinder; the valve element comprises a piston, a valve element connecting rod and a valve head which are sequentially connected, the piston is arranged in the air cylinder and divides the internal space of the air cylinder into two different cavities, namely an exhaust cavity and a damping cavity, and an air leakage hole communicated with the damping cavity is formed in the side wall of the air cylinder; the piston drives the valve core to do reciprocating motion, so that opening or closing between the valve core and the throat channel is realized; a metal induction ring is arranged on the outer circumference of the valve element connecting rod, and an induction coil is arranged at the position, corresponding to the metal induction ring, of the outer wall of the valve body. The metal induction ring and the induction coil interact to generate electromagnetic force; meanwhile, the invention further provides a control method of the quick-opening valve structure for the explosive wave simulation device.

Description

Technical Field

[0001] The invention relates to the field of explosion wave simulation device design, and in particular to a quick-opening valve structure used in the explosion wave simulation device and a control method thereof. Background Art

[0002] High-pressure gas-driven shock tubes are the mainstream type of shock tubes for blast wave simulation. They simulate explosion shock waves by controlling the rapid release of high-pressure gas. High-pressure gas-driven shock tubes are less affected by environmental factors when releasing gas and can be reused.

[0003] Currently, there are two gas release methods for high-pressure gas-driven shock tubes: membrane rupture and quick-opening valves. The membrane rupture method has a simple device structure and can drive rapid energy release, but the membrane rupture device requires high machining precision of the diaphragm. In addition, the diaphragm is expensive and time-consuming to replace, resulting in high experimental costs and low practicality. The quick-opening valve method has the advantages of repeatable operation and short experimental preparation cycle. Therefore, the quick-opening valve structure has great application potential in the drive control of large shock tubes.

[0004] However, due to the technical limitations of valve opening speed, the existing quick-opening valve structure is difficult to apply in the drive control of large shock tubes. The valve opening time is long and the opening speed cannot meet the actual test requirements, making it difficult to ensure the accuracy of the actual test results. Summary of the Invention

[0005] The purpose of the present invention is to solve the technical problems of the existing quick-opening valve structure, such as the long valve opening time and the opening speed cannot meet the actual test requirements, and to propose a quick-opening valve structure and a control method for an explosion wave simulation device.

[0006] To achieve the above objectives, the technical solutions proposed by the present invention are:

[0007] A quick-opening valve structure for an explosion wave simulation device includes a valve body. A throat is provided at the front end of the valve body and is coaxially connected to the driven section of the explosion wave simulation device. The valve body and the throat are connected by a transition cone. A cylinder and a valve core are provided in the valve body near the throat. A relief valve is provided on the rear wall of the cylinder. The valve body is provided with an inlet / exhaust pipe connected to the cylinder. A high-pressure air chamber is formed between the inner wall of the valve body and the outer wall of the cylinder. The special feature of the valve body is that:

[0008] The valve core includes a piston, a valve core connecting rod, and a valve head. The piston is disposed in the cylinder and divides the internal space of the cylinder into two different chambers: an exhaust chamber at the rear end and a damping chamber at the front end. A leakage hole is provided on the side wall of the cylinder for connecting the high-pressure air chamber with the damping chamber. One end of the valve core connecting rod is connected to the piston, and the other end passes through the front wall of the cylinder and is connected to the valve head. The piston drives the valve head to perform reciprocating motion, causing the valve head to move away from or approach the throat, thereby realizing opening or closing between the valve core and the throat.

[0009] A metal induction ring is provided on the outer circumference of the valve core connecting rod, and an induction coil is provided at a position on the outer wall of the valve body corresponding to the metal induction ring; the metal induction ring on the valve core connecting rod interacts with the induction coil on the outer wall of the valve body to generate electromagnetic force, which is used to accelerate the movement of the valve core.

[0010] Furthermore, the metal induction ring is a solenoid structure, and the number of turns N of the winding and the generated electromagnetic force F satisfy the following equation:

[0011]

[0012] Where N is the number of winding turns, I is the current intensity, δ is the air gap length, μ0 is the vacuum magnetic permeability, S is the magnetic circuit cross-sectional area, and k is the magnetic leakage coefficient.

[0013] Furthermore, the valve head is provided with a valve core extension section;

[0014] The outer diameter of the valve core extension section is adapted to the inner diameter of the throat.

[0015] Furthermore, the end of the valve core extension section is a hemispherical structure.

[0016] Furthermore, the valve core and the metal induction ring are both made of high temperature and high pressure resistant materials.

[0017] Furthermore, a buffer cavity is provided on the outer side wall of the front end of the cylinder.

[0018] Furthermore, the overflow valve is a one-way overflow valve.

[0019] At the same time, the present invention also proposes a control method for a quick-opening valve structure of an explosion wave simulation device, comprising the following steps:

[0020] Step 1: Fill the exhaust chamber in the cylinder with high-pressure nitrogen through the inlet / exhaust pipe. Driven by the high-pressure nitrogen in the exhaust chamber, the valve core moves toward the throat until the valve core and the throat are completely closed.

[0021] At the same time, the high-pressure nitrogen in the exhaust chamber flows into the high-pressure air chamber formed between the inner wall of the valve body and the outer wall of the cylinder through the overflow valve on the rear wall of the cylinder. The high-pressure nitrogen in the high-pressure air chamber flows into the damping chamber through the leakage hole.

[0022] Step 2: Monitor the gas pressure value in the high-pressure gas chamber. When the gas pressure in the high-pressure gas chamber reaches the set value, stop filling the exhaust chamber with high-pressure nitrogen, and the valve core in the quick-opening valve structure is in a closed state.

[0023] Step 3: The high-pressure nitrogen in the exhaust chamber is continuously discharged outward through the inlet / exhaust pipe, and the gas pressure in the exhaust chamber gradually decreases. At the same time, the external power supply is turned on to cause the metal induction ring on the valve core connecting rod to interact with the induction coil on the outer wall of the valve body to generate electromagnetic force. The valve core moves in the direction away from the throat under the synergistic drive of the electromagnetic force and the gas pressure difference between the exhaust chamber and the damping chamber;

[0024] Step 4: As the high-pressure nitrogen in the exhaust chamber is continuously discharged, the gas pressure difference between the exhaust chamber and the damping chamber gradually increases, the speed of the valve core moving along the cylinder axis is accelerated, and the gap between the valve core and the transition cone surface of the throat increases;

[0025] Step 5. When the valve core is separated from the throat, the high-pressure nitrogen in the high-pressure gas chamber quickly flows out through the gap created by the separation of the transition cone surface between the valve core and the throat, further accelerating the opening speed of the valve core and achieving rapid release of the driving gas.

[0026] Beneficial effects of the present invention:

[0027] [1] The quick-opening valve structure for the explosion wave simulation device of the present invention is highly practical and has the advantages of being reusable, low in test cost, and short in test cycle. By filling with different gas pressures, it can meet the test requirements of different test scenarios, effectively expanding its scope of application. The structure has strong flexibility and operability.

[0028] [2] In the present invention, the metal induction ring on the valve core connecting rod interacts with the induction coil on the outer wall of the valve body to generate electromagnetic force. The valve core opens and moves under the coordinated drive of the electromagnetic force and the gas pressure difference, which can effectively reduce the time required for the valve core to open, increase the movement speed of the valve core, shorten the opening time of the quick-opening valve structure, effectively extend the service life of the quick-opening valve structure, and save the production cost of the quick-opening valve structure.

[0029] [3] In the present invention, the end of the valve core extension section is set to a hemispherical structure, which can effectively reduce the flow resistance of the high-pressure gas, making the valve core smoother during the opening process, effectively increasing the movement speed of the valve core and reducing the opening time of the valve core.

[0030] [4] The control method of the quick-opening valve structure in the present invention has a simple operation process and is easy to implement. The valve core is accelerated by electromagnetic force, and the air is exhausted outward through the exhaust chamber in the quick-opening valve structure, so that the valve core begins to move under the synergistic effect of the electromagnetic force and the air pressure difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural schematic diagram of an embodiment of a quick-opening valve structure for an explosion wave simulation device according to the present invention;

[0032] Figure 2 This is a schematic diagram of the valve core structure in an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of the force on the valve core in an embodiment of a control method for a quick-opening valve structure of an explosion wave simulation device according to the present invention;

[0034] Figure 4 The displacement curve of the valve core opening movement of the existing quick-opening valve structure is set to 13MPa when the gas pressure in the high-pressure gas chamber is set;

[0035] Figure 5 The displacement curve of the valve core opening movement of the quick-opening valve structure in the embodiment of the present invention is set when the gas pressure in the high-pressure gas chamber is 13 MPa;

[0036] Reference numerals:

[0037] 1-valve body, 2-high-pressure air chamber, 3-relief valve, 4-induction coil, 5-metal induction ring, 6-driven section, 7-throat, 8-valve core, 9-cylinder, 10-exhaust chamber, 11-inlet / exhaust pipe, 12-piston, 13-valve core connecting rod, 14-valve head, 15-leakage hole, 16-buffer chamber, 17-damping chamber, 18-valve core extension section. DETAILED DESCRIPTION

[0038] like Figure 1 As shown, a quick-opening valve structure for an explosion wave simulation device includes a valve body 1, a throat 7 coaxially connected to a driven section 6 is provided at the front end of the valve body 1, the valve body 1 and the throat 7 are connected by a transition cone, a cylinder 9 and a valve core 8 are provided at a position near the throat 7 in the valve body 1, one end of the valve core 8 passes through the front wall of the cylinder 9 and abuts against the throat 7, a one-way relief valve 3 is provided on the rear wall of the cylinder 9, for controlling the unidirectional flow of high-pressure gas in the exhaust chamber 10 into the high-pressure gas chamber 2; a buffer chamber 16 is provided on the side of the front wall of the cylinder 9 near the throat 7, the buffer chamber 16 is used to prevent the valve core 8 from mechanically colliding with the front wall of the cylinder 9, the inner diameter of the buffer chamber 16 is larger than the outer diameter of the valve head 14, and the radial gap between the two forms a leakage annular gap; an inlet / exhaust pipe 11 connected to the cylinder 9 is provided on the valve body 1, and the high-pressure gas chamber 2 is between the inner wall of the valve body 1 and the outer wall of the cylinder 9;

[0039] like Figure 2As shown, the valve core 8 includes a piston 12, a valve core connecting rod 13 and a valve head 14 connected in sequence. The piston 12 is arranged in the cylinder 9 and divides the internal space of the cylinder 9 into two different chambers, namely the exhaust chamber 10 at the rear end and the damping chamber 17 at the front end. A leakage hole 15 is opened on the side wall of the cylinder 9 for connecting the high-pressure air chamber 2 with the damping chamber 17. The leakage hole 15 can control the opening speed of the valve core 8, and the damping chamber 17 can eliminate the vibration of the valve core 8 after opening.

[0040] One end of the valve core connecting rod 13 is connected to the piston 12, and the other end passes through the front wall of the cylinder 9 and is connected to the valve head 14. The piston 12 drives the valve head 14 to reciprocate, so that the valve core 8 and the throat 7 are opened or closed; a valve core extension section 18 is provided on the valve head 14. The outer diameter of the valve core extension section 18 is adapted to the inner diameter of the throat 7. The end of the valve core 18 extension section is a hemispherical structure, which is used to accelerate the movement of the valve core 8;

[0041] A metal induction ring 5 is provided on the outer circumference of the valve core connecting rod 13, and an induction coil 4 is provided at a position on the outer wall of the valve body 1 corresponding to the metal induction ring 5; the metal induction ring 5 on the valve core connecting rod 13 and the induction coil 4 on the outer wall of the valve body 1 interact with each other to generate electromagnetic force, which is used to accelerate the movement of the valve core 8.

[0042] The metal induction ring 5 is a solenoid structure. The metal induction ring 5 is wound on the valve core connecting rod 13. The number of turns N of the winding and the electromagnetic force F generated satisfy the following equation:

[0043]

[0044] Where N is the number of winding turns, I is the current intensity, δ is the air gap length, μ0 is the vacuum magnetic permeability, S is the magnetic circuit cross-sectional area, and k is the magnetic leakage coefficient.

[0045] At the same time, this embodiment also provides a control method for a quick-opening valve structure of an explosion wave simulation device, comprising the following steps:

[0046] Step 1: Fill the exhaust chamber 10 in the cylinder 9 with high-pressure nitrogen through the inlet / exhaust pipe 11. Driven by the high-pressure nitrogen in the exhaust chamber 10, the valve core 8 moves toward the throat 7 until the valve core 8 and the throat 7 are completely closed.

[0047] At the same time, the high-pressure nitrogen in the exhaust chamber 10 flows into the high-pressure gas chamber 2 formed between the inner wall of the valve body 1 and the outer wall of the cylinder 9 in a one-way manner through the relief valve 3 on the rear wall of the cylinder 9. The high-pressure nitrogen in the high-pressure gas chamber 2 flows into the damping chamber 17 through the leakage hole 15.

[0048] The high-pressure nitrogen in the high-pressure chamber 2 flows into the damping chamber 17 of the cylinder 9 through the leakage hole 15 provided on the side wall of the cylinder 9. Since the buffer chamber 16 and the exhaust chamber 10 are all connected to the high-pressure chamber 2, the gas pressure values ​​in the buffer chamber 16, the damping chamber 17 and the exhaust chamber 10 are the same as the gas pressure value in the high-pressure chamber 2.

[0049] Step 2: Monitor the gas pressure value in the high-pressure gas chamber 2. When the gas pressure in the high-pressure gas chamber 2 reaches the set value, stop filling the exhaust chamber 10 with high-pressure nitrogen. The valve core 8 in the quick-opening valve structure is in a closed state. Figure 3 As shown, F1 and F3 are the forces exerted by the gas pressure on the valve core;

[0050] Step 3: The high-pressure nitrogen in the exhaust chamber 10 is continuously discharged outward through the inlet / exhaust pipe 11, and the gas pressure in the exhaust chamber 10 gradually decreases. At the same time, the external power supply is turned on to make the metal induction ring 5 on the connecting rod of the valve core 8 interact with the induction coil 4 on the outer wall of the valve body 1 to generate electromagnetic force. The valve core 8 moves in the direction away from the throat 7 under the coordinated drive of the electromagnetic force and the gas pressure difference between the exhaust chamber 10 and the damping chamber 17, as shown in FIG. Figure 3 As shown, F2 and F4 are the forces exerted on the valve core by the gas pressure difference between the exhaust chamber 10 and the damping chamber 17;

[0051] Step 4: As the high-pressure nitrogen in the exhaust chamber 10 is continuously discharged, the gas pressure difference between the exhaust chamber 10 and the damping chamber 17 gradually increases, the speed of the valve core 8 moving axially along the cylinder 9 is accelerated, and the gap between the valve core 8 and the transition cone surface of the throat 7 increases;

[0052] Step 5: When the valve core 8 is separated from the throat 7, the high-pressure nitrogen in the high-pressure gas chamber 2 quickly flows out through the gap generated by the separation of the transition cone surface between the valve core 8 and the throat 7, further accelerating the opening speed of the valve core 8 and realizing the rapid release of the driving gas.

[0053] When the gas pressure setting value in the high-pressure gas chamber 2 in step 2 is taken as 13 MPa, the opening time of the quick-opening valve structure of the present invention can be less than 1.0 ms according to the test of the above control method, and the equivalent electromagnetic force is 35.6 KN; Figure 4 and Figure 5 As shown, when the gas pressure in the high-pressure gas chamber 2 of the quick-opening valve structure is set to 13 MPa, under the same pressure conditions, it can be clearly concluded that the opening speed of the valve core 8 of the existing quick-opening valve structure is much lower than the opening speed of the valve core 8 of the quick-opening valve structure of the present invention.

Claims

1. A quick-opening valve structure for an explosion wave simulation device, comprising a valve body (1), a throat (7) coaxially connected to a driven section (6) of the explosion wave simulation device is provided at the front end of the valve body (1), the valve body (1) and the throat (7) are connected via a transition cone, a cylinder (9) and a valve core (8) are provided at a position near the throat (7) in the valve body (1), a relief valve (3) is provided on the rear wall of the cylinder (9), an inlet / exhaust pipe (11) connected to the cylinder (9) is provided on the valve body (1), a high-pressure air chamber (2) is provided between the inner wall of the valve body (1) and the outer wall of the cylinder (9), Features: The valve core (8) comprises a piston (12), a valve core connecting rod (13) and a valve head (14); the piston (12) is arranged in the cylinder (9) and divides the internal space of the cylinder (9) into two different chambers, namely an exhaust chamber (10) located at the rear end and a damping chamber (17) located at the front end; a leakage hole (15) for connecting the high-pressure air chamber (2) with the damping chamber (17) is provided on the side wall of the cylinder (9); one end of the valve core connecting rod (13) is connected to the piston (12), and the other end passes through the front wall of the cylinder (9) and is connected to the valve head (14); the piston (12) drives the valve head (14) to perform reciprocating motion, so that the valve head (14) moves away from or close to the throat (7), thereby realizing the opening or closing between the valve core (8) and the throat (7); A metal induction ring (5) is arranged on the outer circumference of the valve core connecting rod (13), and an induction coil (4) is arranged at a position on the outer wall of the valve body (1) corresponding to the metal induction ring (5); the metal induction ring (5) on the valve core connecting rod (13) and the induction coil (4) on the outer wall of the valve body (1) interact with each other to generate an electromagnetic force for accelerating the movement of the valve core (8).

2. A quick-opening valve structure for an explosion wave simulation device according to claim 1, Features: The metal induction ring (5) is a solenoid structure, and the number of turns N of the winding and the electromagnetic force F generated satisfy the following equation: Where N is the number of winding turns, I is the current intensity, δ is the air gap length, μ 0 is the vacuum magnetic permeability, S is the cross-sectional area of ​​the magnetic path, and k is the magnetic leakage coefficient.

3. A quick-opening valve structure for an explosion wave simulation device according to claim 2, Features: The valve head (14) is provided with a valve core extension section (18); The outer diameter of the valve core extension section (18) is adapted to the inner diameter of the throat (7).

4. A quick-opening valve structure for an explosion wave simulation device according to claim 3, Features: The end of the valve core extension section (18) is a hemispherical structure.

5. A quick-opening valve structure for an explosion wave simulation device according to claim 4, Features: The valve core (8) and the metal induction ring (5) are both made of high temperature and high pressure resistant materials.

6. A quick-opening valve structure for a blast wave simulation device according to claim 5, Features: A buffer chamber (16) is provided on the outer side wall of the front end of the cylinder (9).

7. A quick-opening valve structure for an explosion wave simulation device according to claim 1, Features: The overflow valve (3) is a one-way overflow valve.

8. A control method for the quick-opening valve structure of the explosion wave simulation device according to any one of claims 1 to 7, It is characterized in that The following steps are involved: Step 1: Fill the exhaust chamber (10) in the cylinder (9) with high-pressure nitrogen through the inlet / exhaust pipe (11); and under the driving action of the high-pressure nitrogen in the exhaust chamber (10), the valve core (8) moves toward the throat (7) until the valve core (8) and the throat (7) are completely closed; At the same time, the high-pressure nitrogen in the exhaust chamber (10) flows in a one-way manner through the overflow valve (3) on the rear wall of the cylinder (9) into the high-pressure gas chamber (2) formed between the inner wall of the valve body (1) and the outer wall of the cylinder (9), and the high-pressure nitrogen in the high-pressure gas chamber (2) flows into the damping chamber (17) through the leakage hole (15); Step 2: monitor the gas pressure value in the high-pressure gas chamber (2); when the gas pressure in the high-pressure gas chamber (2) reaches a set value, stop filling the exhaust chamber (10) with high-pressure nitrogen, and the valve core (8) in the quick-opening valve structure is in a closed state; Step 3: The high-pressure nitrogen in the exhaust chamber (10) is continuously discharged outward through the inlet / exhaust pipe (11), and the gas pressure in the exhaust chamber (10) gradually decreases. At the same time, the external power supply is turned on to make the metal induction ring (5) on the valve core connecting rod (13) interact with the induction coil (4) on the outer wall of the valve body (1) to generate electromagnetic force. The valve core (8) moves in a direction away from the throat (7) under the coordinated drive of the electromagnetic force and the gas pressure difference between the exhaust chamber (10) and the damping chamber (17); Step 4: As the high-pressure nitrogen in the exhaust chamber (10) is continuously discharged, the gas pressure difference between the exhaust chamber (10) and the damping chamber (17) gradually increases, the speed of the valve core (8) moving along the axial direction of the cylinder (9) increases, and the gap between the valve core (8) and the transition cone surface of the throat (7) increases; Step 5: When the valve core (8) is separated from the throat (7), the high-pressure nitrogen in the high-pressure gas chamber (2) quickly flows out through the gap generated by the separation of the transition cone surface between the valve core (8) and the throat (7), further accelerating the opening speed of the valve core (8) and achieving rapid release of the driving gas.

Images