Self-acting differential valve for controlling pressure of supercritical carbon dioxide

Abstract

The application provides a self-differential valve for controlling supercritical carbon dioxide pressure, and belongs to the technical field of high-speed underwater projectiles. The self-differential valve can keep carbon dioxide pressure at 10 MPa, and quickly opens the valve when supercritical carbon dioxide is transformed to 300 MPa. The whole state conversion process is realized by mechanical differential, the response speed is improved, the quick release requirement of the supercritical carbon dioxide high-pressure system can be met, and the overall structure is simplified without involving an electric control system.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of valves, and particularly discloses a self-differential valve for controlling pressure of supercritical carbon dioxide. BACKGROUND

[0002] As a closed and released device of high-pressure system medium, the rapidity of response of the valve directly affects the performance of the high-pressure system. With the increasing requirement for the rapidity of the working state conversion of the high-pressure system, the rapid response of the valve is also improved.

[0003] At present, the valve of high-pressure medium mainly adopts manual valve, electromagnetic valve and self-differential valve. However, due to the phase change process of supercritical carbon dioxide under special working conditions being only about 80 ms, the manual valve cannot meet the requirements in safety and rapid response; the response time of the electromagnetic valve is faster than that of the manual valve, but the electromagnetic valve needs to be configured with a corresponding electric control system, and the overall structure is complex; the self-differential valve is a valve which moves by using the energy of the internal gas medium itself, and the response time thereof can reach millisecond level according to the medium energy, but the existing self-differential valve can realize the opening and closing of the valve in the static pressure state, and cannot realize the opening and closing of the valve in the growth process of supercritical carbon dioxide. SUMMARY

[0004] The application provides a self-differential valve for controlling pressure of supercritical carbon dioxide, and solves the technical problem that the existing valve cannot meet the opening and closing in the growth process of supercritical carbon dioxide.

[0005] The application provides a self-differential valve for controlling supercritical carbon dioxide pressure, which comprises an air storage chamber, a gas release valve, a gas release valve spring, a piston channel, a moving piston, a piston spring, a fixed shell, an air passage, a moving shell, a traction rod, a traction cable, a stop pin, an outer shell, an end cover, a curved lever and a curved lever spring; the air storage chamber is provided with a gas release port and an air passage interface I, and the gas release port and the air passage interface I are uniformly arranged around the central axis of the air storage chamber; the gas release valve comprises a piston part and a rod part, the piston part is sealingly and slidingly arranged in the gas release port, and the rod part is sealingly and penetratingly arranged in the gas release port; the gas release valve spring is sleeved on the rod part, and the two ends of the gas release valve spring are connected with the rod part and the outer wall of the gas release port respectively; the two ends of the piston channel are a closed end and an open end respectively, the open end is communicated with the air storage chamber, and the side wall of the piston channel is provided with an air hole; the moving piston is sealingly and slidingly arranged in the piston channel, and the two ends of the piston spring are connected with the moving piston and the closed end of the piston channel respectively; the fixed shell is fixedly arranged outside the piston channel and is provided with an air passage interface II and a stop pin hole II, and the air passage interface II is communicated with the air passage interface I through the air passage; the moving shell is sealingly and slidingly arranged between the fixed shell and the piston channel, the moving shell, the fixed shell and the piston channel enclose an air chamber I which is communicated with the air passage; the moving shell is provided with a stop pin hole I, and the end part of the moving shell outside the fixed shell is provided with the traction rod; the traction rod is connected with the rod part of the gas release valve through the traction cable; the stop pin is movably arranged through the stop pin hole II and the stop pin hole I; the outer shell is fixedly arranged outside the fixed shell and encloses the stop pin; the end cover is sleeved outside the piston channel, and the air hole of the piston channel is arranged in the end cover; the curved lever comprises a straight line segment I, a curved segment, a connecting segment and a straight line segment II which are sequentially connected, the straight line segment I penetrates through the outer shell, the curved segment penetrates through the stop pin and the traction rod, the straight line segment II is sealingly and slidingly arranged between the piston channel and the end cover, the straight line segment II, the piston channel and the end cover enclose an air chamber II which is communicated with the air hole, and the distance between the curved segment and the central axis of the piston channel gradually increases from the straight line segment I to the connecting segment; the curved lever spring is sleeved on the rod body of the straight line segment I outside the outer shell, and the two ends of the curved lever spring are connected with the straight line segment I and the outer shell respectively.

[0006] Further, the connecting section of the air storage chamber and the piston channel is a conical structure, and the open end of the piston channel is located at the narrowest part of the conical structure.

[0007] Further, the self-differential valve for controlling supercritical carbon dioxide pressure further comprises a gas release branch pipe which is communicated with the gas release port.

[0008] Further, a plurality of gas release branch pipes are combined into a gas release main pipe.

[0009] Further, the air storage chamber and the piston channel are integrally formed.

[0010] Further, the central axes of the air storage chamber and the piston channel are collinear, and the gas release port, the air passage and the traction rod are symmetrically arranged with the central axes of the air storage chamber and the piston channel as the symmetry axes.

[0011] Further, the air release valve spring, the piston spring and the curved lever spring are high-rigidity springs, and the traction cable is a steel cable.

[0012] The present application has the following advantages.

[0013] 1. The self-differential valve can keep the carbon dioxide pressure at 10 MPa and quickly open the valve when the supercritical carbon dioxide phase changes to 300 MPa, the whole state conversion process is realized by mechanical differential, the response speed is improved, the quick release requirement of the supercritical carbon dioxide high-pressure system is met, and the overall structure is simplified without involving the electric control system.

[0014] 2. In the self-differential valve, the gas chamber has the functions of concentrating high-pressure gas to the piston contact surface and quickly releasing the gas chamber gas when reaching a predetermined pressure, the gas chamber structure adjacent to the moving piston is conical, which plays a role of gas concentration and facilitates the carbon dioxide to be filled into the piston channel after the supercritical reaction, and the gas chamber has a large gas release port, which can quickly release the high-pressure gas in the gas chamber when the air release valve is opened, and can meet the actual needs.

[0015] 3. The self-differential valve uses the moving piston with a piston spring as a pressure control device, the moving piston surface directly contacts with the gas in the gas chamber, when the supercritical phase change reaction of the carbon dioxide in the gas chamber occurs, the pressure in the gas chamber instantaneously increases, when reaching the preset movement pressure of the moving piston, the moving piston moves backward, the preset movement pressure of the moving piston is matched by the rigidity of the assembled piston spring, which has high reliability and can save cost.

[0016] 4. The self-differential valve limits the traction rod by the stop pin, when the gas chamber reaches the preset pressure, the moving piston moves to the end of the stroke, the high-pressure gas pushes the curved lever forward through the two side gas chambers II, due to the structural characteristics of the curved lever, the stop pin can be lifted to prevent the air release valve from opening too early when the gas pressure does not reach the requirement, this pressure control mechanism is simple, has high reliability and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a structural schematic diagram of the self-differential valve for controlling the pressure of supercritical carbon dioxide.

[0019] Figure 2 It is Figure 1Enlarged view of the gas reservoir portion

[0020] Figure 3 For Figure 2 Enlarged view of the piston channel portion

[0021] In the figure: 1 - gas reservoir, 2 - gas release valve, 3 - gas release valve spring, 4 - piston channel, 5 - moving piston, 6 - piston spring, 7 - fixed housing, 8 - gas duct, 9 - moving housing, 10 - traction rod, 11 - traction cable, 12 - stop pin, 13 - outer housing, 14 - end cap, 15 - curved lever, 16 - curved lever spring, 17 - gas chamber I, 18 - gas chamber II, 19 - gas release branch, 20 - gas release main. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0023] The present embodiment provides a self-differential valve for controlling the pressure of supercritical carbon dioxide, comprising a gas reservoir 1, a gas release valve 2, a gas release valve spring 3, a piston channel 4, a moving piston 5, a piston spring 6, a fixed housing 7, a gas duct 8, a moving housing 9, a traction rod 10, a traction cable 11, a stop pin 12, an outer housing 13, an end cap 14, a curved lever 15, and a curved lever spring 16.

[0024] The gas storage chamber 1 is provided with a gas release port and an airway interface I, and the gas release port and the airway interface I are uniformly arranged around the central axis of the gas storage chamber 1; the gas release valve 2 comprises a piston part and a rod part, the piston part is sealingly and slidingly arranged in the gas release port, and the rod part is sealingly and penetratingly arranged in the gas release port; the gas release valve spring 3 is sleeved on the rod part, and two ends of the gas release valve spring 3 are connected with the rod part and the outer wall of the gas release port respectively; the piston channel 4 comprises a closed end and an open end, the open end is communicated with the gas storage chamber 1, and a gas hole is arranged on the side wall of the piston channel 4; the moving piston 5 is sealingly and slidingly arranged in the piston channel 4, and two ends of the piston spring 6 are connected with the moving piston 5 and the closed end of the piston channel 4 respectively; the fixed shell 7 is fixedly arranged outside the piston channel 4, and is provided with an airway interface II and a stop pin hole II, the airway interface II is communicated with the airway interface I through the airway 8; the moving shell 9 is sealingly and slidingly arranged between the fixed shell 7 and the piston channel 4, the moving shell 9, the fixed shell 7 and the piston channel 4 enclose a gas chamber I 17 communicated with the airway 8, the moving shell 9 is provided with a stop pin hole I, and an end part of the moving shell 9 located outside the fixed shell 7 is provided with a traction rod 10; the traction rod 10 is connected with the rod part of the gas release valve 2 through a traction rope 11; the stop pin 12 is movably arranged through the stop pin hole II and the stop pin hole I; the outer shell 13 is fixedly arranged outside the fixed shell 7, and the stop pin 12 is enclosed in the outer shell 13; the end cover 14 is sleeved outside the piston channel 4, and the gas hole on the piston channel 4 is located in the end cover 14; the curved lever 15 comprises a straight line segment I, a curved segment, a connecting segment and a straight line segment II connected in sequence, the straight line segment I penetrates through the outer shell 13, the curved segment penetrates through the stop pin 12 and the traction rod 10, the straight line segment II is sealingly and slidingly arranged between the piston channel 4 and the end cover 14, the straight line segment II, the piston channel 4 and the end cover 14 enclose a gas chamber II 18 communicated with the gas hole, and the distance between the curved segment and the central axis of the piston channel 4 gradually increases from the straight line segment I to the connecting segment; the curved lever spring 16 is sleeved on the rod body of the straight line segment I located outside the outer shell 13, and two ends of the curved lever spring 16 are connected with the straight line segment I and the outer shell 13 respectively.

[0025] Further, the connecting part of the gas storage chamber 1 and the piston channel 4 is a tapered structure, and the open end of the piston channel 4 is located at the narrowest part of the tapered structure. The tapered structure plays a role of gas gathering.

[0026] Further, the self-differential valve for controlling the pressure of supercritical carbon dioxide further comprises a gas release branch pipe 19 communicated with the gas release port.

[0027] Further, a plurality of gas release branch pipes 19 are merged into a gas release main pipe 20.

[0028] Further, the gas storage chamber 1 and the piston channel 4 are integrally formed.

[0029] Further, the central axes of the gas storage chamber 1 and the piston channel 4 are collinear, and the gas release port, the airway 8 and the traction rod 10 are symmetrically arranged around the central axes of the gas storage chamber 1 and the piston channel 4.

[0030] Further, the air release valve spring 3, the piston spring 6 and the curved lever spring 16 are all high-rigidity springs, and the traction cable 10 is a steel cable.

[0031] The working process of the self-acting differential valve for controlling the pressure of supercritical carbon dioxide is described as follows.

[0032] Carbon dioxide is filled in the gas storage chamber 1, and when the supercritical phase change reaction of carbon dioxide occurs, the pressure in the gas storage chamber 1 rapidly rises, and part of the high-pressure gas enters the gas chamber I 17 through the gas passage 8. Due to the limiting action of the stop pin 12, the moving shell 9 and the traction rod 10 are in a static state at this time. Due to the gas gathering design, when the gas pressure reaches the preset movement pressure of the moving piston 5, part of the high-pressure gas rapidly pushes the moving piston 5 to move backward, and the piston spring 6 is compressed. When the moving piston 5 moves past the gas hole on the side wall of the piston passage 4, the high-pressure gas pushes the curved lever 15 to move forward through the gas chamber II 18. Due to the special structure of the curved section being low in front and high in back, the curved lever 15 is lifted upward while moving forward, so that the stop pin 12 moves out of the stop pin hole I on the moving shell 9. The moving shell 9 and the traction rod 10 move backward under the action of the high-pressure gas entering the gas chamber I 17, and drive the air release valve 2 to open through the traction cable 11. The air release valve spring 3 is compressed, and the high-pressure gas is rapidly discharged from the two sides of the air release port. When the gas in the gas storage chamber 1 is exhausted, the gas pressure in the gas storage chamber 1 drops to atmospheric pressure, and the air release valve 2, the moving shell 9 and the traction rod 10 are reset under the action of the air release valve spring 3. The air release valve 2 is closed, the curved lever 15 is reset under the action of the curved lever spring 16, the stop pin 12 is driven to move downward, enters the stop pin hole I on the moving shell 9, and limits the moving shell 9. The moving piston 5 is reset under the action of the piston spring 6, and the action of the self-acting differential valve is completed.

[0033] The self-acting differential valve for controlling the pressure of supercritical carbon dioxide described above can maintain the carbon dioxide pressure at 10 MPa, and quickly open the valve when the supercritical carbon dioxide changes to 300 MPa. The whole state conversion process is realized by mechanical differential, which improves the response speed and meets the rapid release requirements of the supercritical carbon dioxide high-pressure system. Moreover, the whole structure is simplified because the electric control system is not involved.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for part or all of the technical features. Such modifications or substitutions do not change the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A self-acting differential valve for controlling the pressure of supercritical carbon dioxide, characterized by, The device comprises a gas storage chamber, a gas release valve, a gas release valve spring, a piston channel, a moving piston, a piston spring, a fixed shell, a gas passage, a moving shell, a traction rod, a traction cable, a stop pin, a shell, an end cover, a curved lever and a curved lever spring; The gas storage chamber is provided with a gas release port and a gas passage interface I, and the gas release port and the gas passage interface I are uniformly arranged around the central axis of the gas storage chamber; The gas release valve comprises a piston part and a rod part, the piston part is sealingly and slidingly arranged in the gas release port, and the rod part is sealingly and penetratingly arranged in the gas release port; The gas release valve spring is sleeved on the rod part, and two ends thereof are connected with the rod part and the outer wall of the gas release port respectively; Two ends of the piston channel are a closed end and an open end respectively, the open end is communicated with the gas storage chamber, and a gas hole is arranged on the side wall of the piston channel; The moving piston is sealingly and slidingly arranged in the piston channel, and two ends of the piston spring are connected with the moving piston and the closed end of the piston channel respectively; The fixed shell is fixedly arranged outside the piston channel, and is provided with a gas passage interface II and a stop pin hole II, the gas passage interface II is communicated with the gas passage interface I through the gas passage; The moving shell is sealingly and slidingly arranged between the fixed shell and the piston channel, the moving shell, the fixed shell and the piston channel enclose a gas chamber I communicated with the gas passage, the moving shell is provided with a stop pin hole I, and an end portion of the moving shell outside the fixed shell is provided with the traction rod; The traction rod is connected with the rod part of the gas release valve through the traction cable; The stop pin is movably arranged through the stop pin hole II and the stop pin hole I; The shell is fixedly arranged outside the fixed shell and encloses the stop pin; The end cover is sleeved outside the piston channel, and the gas hole on the piston channel is arranged in the end cover; The curved lever comprises a straight line segment I, a curved segment, a connecting segment and a straight line segment II connected in sequence, the straight line segment I penetrates through the shell, the curved segment penetrates through the stop pin and the traction rod, the straight line segment II is sealingly and slidingly arranged between the piston channel and the end cover, the straight line segment II, the piston channel and the end cover enclose a gas chamber II communicated with the gas hole, and the distance between the curved segment and the central axis of the piston channel gradually increases from the straight line segment I to the connecting segment; The curved lever spring is sleeved on the rod body of the straight line segment I outside the shell, and two ends thereof are connected with the straight line segment I and the shell respectively.

2. The self-acting differential valve for controlling the pressure of supercritical carbon dioxide according to claim 1, characterized by, The connecting section of the gas storage chamber and the piston channel is a tapered structure, and the open end of the piston channel is located at the narrowest part of the tapered structure.

3. The self-acting differential valve for controlling the pressure of supercritical carbon dioxide according to claim 2, characterized by, The device further comprises a gas release branch pipe communicated with the gas release port.

4. The self-acting differential valve for controlling the pressure of supercritical carbon dioxide according to claim 3, characterized by A plurality of gas release branch pipes are merged into a gas release main pipe.

5. The self-acting differential valve for controlling the pressure of supercritical carbon dioxide according to any one of claims 1 to 4, characterized by, The gas storage chamber and the piston channel are integrally formed.

6. The self-acting differential valve for controlling the pressure of supercritical carbon dioxide according to claim 5, characterized by The central axes of the gas storage chamber and the piston channel are collinear, and the gas release port, the gas passage and the traction rod are symmetrically arranged with the central axes of the gas storage chamber and the piston channel as the symmetry axes.

7. The self-acting differential valve for controlling the pressure of supercritical carbon dioxide according to claim 6, characterized by The gas release valve spring, the piston spring and the curved lever spring are high-stiffness springs, and the traction cable is a steel cable.

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