Self-powered ultra-micro pressure split-path director and method of use

Abstract

The application relates to the technical field of range commanders, in particular to a self-operated ultra-micro pressure range commander and a use method, which comprises a cylinder body, a float is arranged in the cylinder body, a top cover is arranged on the upper end of the cylinder body, a bottom cover is arranged on the lower end of the cylinder body, a plurality of air vents are arranged at the same horizontal height position of the middle part of the outer wall of the cylinder body, a valve three-way pipe, a valve two-way pipe and a valve one-way pipe are sequentially arranged on the upper part of the outer wall of the cylinder body from top to bottom, a first sealing ring and a second sealing ring are respectively formed on the upper end of the outer wall of the float, the first sealing ring and the second sealing ring form a sealing area on the upper end of the outer wall of the float, a plurality of air holes penetrating through the side wall of the float are arranged on the center line of the sealing area, and the other end of the air inlet pipe is connected with a controlled gas phase source. The application solves the adverse effect caused by the direct action of the controlled gas on the self-operated micro pressure valve diaphragm, and eliminates the cross operation of a plurality of self-operated micro pressure valves.

Description

Technical Field

[0001] This invention relates to the field of split-range controller technology, specifically to a self-powered ultra-low pressure split-range controller and its usage method. Background Technology

[0002] Self-operated micro-pressure valves are widely used in various industrial equipment for controlling micro-pressure of gas. The controlled micro-pressure gas flows into the valve by gravity and acts directly on one side of a large-size valve diaphragm, while the pressure on the other side of the diaphragm is atmospheric pressure. The controlled micro-pressure gas generates a thrust greater than the valve spring's set pressure through the large-size valve diaphragm to open or close the valve. Even small fluctuations in the controlled gas pressure will cause frequent changes in the valve diaphragm thrust, and the spring's reverse force will also change accordingly, directly resulting in a decrease in the control accuracy of the self-operated micro-pressure valve and an increase in leakage.

[0003] In industrial atmospheric pressure tanks, the micro-positive pressure control of the gas phase is mostly achieved independently by a nitrogen blanketing valve, a waste gas collection valve, and a vent valve, each operating within its designated pressure range. Taking an atmospheric pressure tank with a design pressure of 2.0 kPa as an example, the nitrogen blanketing valve has an opening pressure of 0.2 kPa and a closing pressure of 0.5 kPa; the waste gas collection valve has an opening pressure of 0.9 kPa and a closing pressure of 0.765 kPa; and the vent valve has an opening pressure of 1.35 kPa and a closing pressure of 1.15 kPa. Therefore, the minimum pressure difference between these three valves with different functions is 0.25 kPa, and the minimum pressure difference when a single valve is open or closed is 0.135 kPa. Industrial atmospheric pressure tanks are affected by factors such as incoming and outgoing materials and changes in ambient temperature, resulting in frequent fluctuations in gas pressure that directly affect the diaphragm of the self-operated micro-pressure valves. This can easily lead to a decrease in the control accuracy of the three self-operated micro-pressure valves, failing to meet the specified Pa level control accuracy requirements for the gas phase pressure of the atmospheric pressure tank. In some cases, the three self-operated micro-pressure valves may even operate in a cross-operational manner. This is the main reason for the high nitrogen consumption, large waste gas emissions, and atmospheric pollution caused by the venting of waste gas from industrial atmospheric pressure tanks. To address this issue, a self-operated ultra-micro pressure split-range controller and its usage method are proposed. Summary of the Invention

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a self-powered ultra-micro pressure split-range controller and its usage method.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a self-powered ultra-micro pressure split-range controller, comprising a cylinder, a float, a top cover, and a bottom cover. The float is disposed inside the cylinder, the top cover is installed on the upper end of the cylinder, and the bottom cover is installed on the lower end of the cylinder. Several vents are provided at the same horizontal height position in the middle of the outer wall of the cylinder. A valve three-way connecting pipe, a valve two-way connecting pipe, and a valve one-way connecting pipe are arranged sequentially from top to bottom on the upper part of the outer wall of the cylinder. The valve three-way connecting pipe, the valve two-way connecting pipe, and the valve one-way connecting pipe are respectively connected to a set of self-powered micro-pressure valves.

[0006] The upper end of the outer wall of the pontoon is formed with a first sealing ring and a second sealing ring, which together form a sealing area on the upper end of the outer wall of the pontoon. Several air holes penetrating the side wall of the pontoon are opened on the center line of the sealing area. The lower end of the outer wall of the pontoon is formed with a third sealing ring. A traction rope is installed at the center of the inner end face of the top plate of the pontoon, and a pressure block assembly is fixed at the lower part of the traction rope.

[0007] The top cover has a passageway inside, and a zero-gravity module for balancing the weight of the float is installed in the passageway.

[0008] An air inlet pipe is provided inside the bottom cover, and the other end of the air inlet pipe is connected to the controlled gas phase source.

[0009] Preferably, one end of the passageway is located at the bottom center of the top cover, and the other end of the passageway is located on the side of the top cover. The upper space of the float top plate is connected to the atmosphere through the passageway. The zero-gravity module includes a tension rope, a positioning wheel, a guide wheel, and a counterweight assembly. The positioning wheel is located at one end of the passageway, and the guide wheel is located at the other end of the passageway. The tension rope passes through the passageway and is located between the positioning wheel and the guide wheel. One end of the tension rope extends into the cylinder body and is connected to the center of the outer end face of the float top plate. The other end of the tension rope extends to the outside of the cylinder body, and a counterweight assembly is provided at the other end of the tension rope.

[0010] Preferably, the weight of the counterweight group is the same as the total weight of the float, the first sealing ring, the second sealing ring, and the third sealing ring.

[0011] Preferably, the float is a hollow cylinder with a top plate, and the total travel distance of the float inside the cylinder is L. The total travel distance L is divided into several working strokes L1. The number of pressure blocks is matched with the number of pressure blocks in the pressure block group. The net distance between the first sealing ring and the second sealing ring is L2. The length of the net distance L2 is greater than the diameter of the valve three-way connecting pipe, the valve two-way connecting pipe and the valve one-way connecting pipe. The working stroke L1 is greater than the net distance L2.

[0012] Preferably, the vent is located between the second sealing ring and the third sealing ring, the lower limit of the second sealing ring is located above the vent, the upper limit of the third sealing ring is located below the vent, the vent is connected to the outside atmosphere, and the space pressure between the second sealing ring and the third sealing ring is atmospheric pressure.

[0013] Preferably, the centerline of the vent is the float pressure stroke line, and the sum of the internal pressure of the float and the spatial pressure in the sealing area is equal to the controlled gas phase source pressure.

[0014] Preferably, the opening pressure value and closing pressure value set for the valve one connecting pipe are P1 and P2, the closing pressure value and opening pressure value set for the valve two connecting pipe are P3 and P4, and the closing pressure value and opening pressure value set for the valve three connecting pipe are P5 and P6, and the order of the pressure values ​​is: P1 < P2 < P3 < P4 < P5 < P6.

[0015] Preferably, the cylinder body is provided with the following stroke lines from bottom to top: bottom stroke line, P1 stroke line, P2 stroke line, P3 stroke line, P4 stroke line, P5 stroke line, and top stroke line. The interval between adjacent stroke lines is the same as the working stroke L1. The opening pressure value P1, closing pressure value P2, closing pressure value P3, opening pressure value P4, closing pressure value P5, and opening pressure value P6 correspond to the P1 stroke line, P2 stroke line, P3 stroke line, P4 stroke line, P5 stroke line, and top stroke line, respectively. The P1 stroke line, P4 stroke line, and top stroke line coincide with the center lines of the valve one connecting pipe, valve two connecting pipe, and valve three connecting pipe, respectively.

[0016] Preferably, the pressure-regulating block group includes a first pressure-regulating block, a second pressure-regulating block, a third pressure-regulating block, a fourth pressure-regulating block, a fifth pressure-regulating block, and a sixth pressure-regulating block fixed at intervals at the lower part of the traction rope. The fixed intervals are the same as the working stroke L1. When the pressure stroke line of the float coincides with the top stroke line, the distance between the sixth pressure-regulating block and the bottom cover is the same as the working stroke L1. The weights of the first pressure-regulating block, the second pressure-regulating block, the third pressure-regulating block, the fourth pressure-regulating block, the fifth pressure-regulating block, and the sixth pressure-regulating block match the set pressure value of the self-operated micro-pressure valve.

[0017] The method of using a self-powered ultra-low pressure split-range controller includes the following steps:

[0018] In step S1, the controlled gas source enters the cylinder through the intake pipe. When the thrust of the gas pressure acting on the force-bearing area of ​​the float is less than the weight of the first constant pressure block, the float stands vertically on the upper end face of the bottom cover and remains stationary. The center line of the air hole on the float stops at the bottom stroke line of the float, and the controlled gas source is sealed inside the float. At this time, the valve three-way connecting pipe, valve two-way connecting pipe and valve one-way connecting pipe are all located above the float and are connected to the atmosphere through the passage. The pressure on both sides of the diaphragm of the three self-operated micro-pressure valves connected to the valve three-way connecting pipe, valve two-way connecting pipe and valve one-way connecting pipe is atmospheric pressure P0, and the three self-operated micro-pressure valves are all in the closed state.

[0019] In step S2, when the pressure of the controlled gas source rises to the opening pressure P1, the thrust generated by the gas pressure pushes the float and the first constant pressure block to rise synchronously by one working stroke L1. The traction rope folded between the first and second constant pressure blocks extends and straightens. The weight of the second constant pressure block acts on the float to prevent it from rising further. The center line of the gas hole stops at the float's stroke line P1, i.e., the opening pressure value P1. The controlled gas in the float cavity enters the diaphragm side of the self-operated micro-pressure valve connected to it through the valve-1 connecting pipe. The diaphragm side reaches the set opening pressure P1. When the self-operated micro-pressure valve is open, due to the gravity limiting effect of the second pressure-regulating block, the center line of the air hole remains at the center of the valve-1 connecting pipe until the controlled gas pressure in the float reaches the next set pressure P2. The self-operated micro-pressure valve connected to the valve-1 connecting pipe is always in the open state. The valve-2 connecting pipe and the valve-3 connecting pipe are both located above the top plate of the float and are connected to the atmosphere through the passage. The pressure on both sides of the diaphragm of the two self-operated micro-pressure valves connected to the valve-2 connecting pipe and the valve-3 connecting pipe is atmospheric pressure P0. Both self-operated micro-pressure valves are in the closed state.

[0020] In step S3, when the pressure of the controlled gas source rises to the shut-off pressure P2, the thrust generated by the gas pressure pushes the float, the first constant pressure block, and the second constant pressure block to rise synchronously for one working stroke L1. The traction rope folded between the second and third constant pressure blocks extends and straightens. The weight of the third constant pressure block acts on the float to prevent it from continuing to rise. The centerline of the gas orifice stops at the float's stroke line P2, i.e., the shut-off pressure value P2. The controlled gas is sealed inside the float, and the valve-1 connecting pipe is located between the second and third sealing rings. The controlled gas remaining on one side of the diaphragm of the self-operated micro-pressure valve connected to the valve one connecting pipe is released into the atmosphere through the vent. The pressure on both sides of the diaphragm of the self-operated micro-pressure valve is atmospheric pressure P0. At this time, the self-operated micro-pressure valve connected to the valve one connecting pipe is closed. The valve two connecting pipe and the valve three connecting pipe are both located above the top plate of the float and are connected to the atmosphere through the passage. The pressure on both sides of the diaphragm of the two self-operated micro-pressure valves connected to the valve two connecting pipe and the valve three connecting pipe is atmospheric pressure P0. Both self-operated micro-pressure valves are in the closed state.

[0021] Step S4: Repeat steps S1 and S3. As the controlled gas pressure in the inner cavity of the float increases step by step, the controlled gas pressure gradually reaches the closing pressure value P3, the opening pressure value P4, the closing pressure value P5, and the opening pressure value P6. The controlled gas pushes the float to rise step by step, which in turn drives the fourth, fifth, and sixth constant pressure blocks to rise. The center line of the air hole stops at the float's P3 stroke line, float's P4 stroke line, float's P5 stroke line, and float's top stroke line in sequence. During this period, the valve two connecting pipe and the valve three connecting pipe operate in sequence.

[0022] Step S5: As the controlled gas pressure in the inner cavity of the float decreases step by step, the controlled gas pressure in the inner cavity of the float decreases step by step to the opening pressure value P6, the closing pressure value P5, the opening pressure value P4, and the closing pressure value P3. For each vertical descent of the float by one working stroke L1, the sixth constant pressure block, the fifth constant pressure block, the fourth constant pressure block, the third constant pressure block, the second constant pressure block, and the first constant pressure block are stacked sequentially on the upper end face of the bottom cover. The center line of the air hole passes step by step through the float P5 stroke line, the float P4 stroke line, the float P3 stroke line, and the float P2 stroke line until it reaches the bottom stroke line of the float.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. This invention requires no external energy source. It uses the slightly positive pressure of the controlled gas as a power source to drive the float to perform variable gravity, fixed-distance multi-stroke motion. The controlled gas output at the set pressure in each stroke opens the corresponding self-operated micro-pressure valve. At the same time, it releases the pressure of the controlled gas in the diaphragm of the other self-operated micro-pressure valves to atmospheric pressure, ensuring that the valve closes quickly and the spring sealing force is at its maximum value. This solves the adverse effects caused by the controlled gas directly acting on the diaphragm of the self-operated micro-pressure valve and eliminates the phenomenon of multiple self-operated micro-pressure valves operating in a cross-operation.

[0025] 2. This invention adopts a unique combination structure of counterweight block group, float and pressure-regulating block. Taking advantage of the large force-bearing area of ​​the float and its sensitivity to micro-pressure changes in the gas, and configuring a pressure-regulating block with precise weight, the gas setting pressure control accuracy reaches the Pa level. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .

[0028] The numbers in the diagram represent: 1. Cylinder; 2. Float; 3. Top cover; 4. Bottom cover; 5. Vent; 6. Valve 1 connecting pipe; 7. Valve 2 connecting pipe; 8. Valve 3 connecting pipe; 9. First sealing ring; 10. Second sealing ring; 11. Third sealing ring; 12. Tension rope; 13. Positioning wheel; 14. Guide wheel; 15. Counterweight assembly; 16. Traction rope; 17. Intake pipe; 18. Air port; 19. First pressure regulating block; 20. Second pressure regulating block; 21. Third pressure regulating block; 22. Fourth pressure regulating block; 23. Fifth pressure regulating block; 24. Sixth pressure regulating block. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, which illustrate the above and other technical features and advantages of the present invention. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive.

[0030] Example:

[0031] like Figure 1-2 As shown, the present invention provides a self-powered ultra-micro pressure split-range controller, including a cylinder 1, a float 2, a top cover 3, and a bottom cover 4. The float 2 is disposed inside the cylinder 1, the top cover 3 is installed on the upper end of the cylinder 1, and the bottom cover 4 is installed on the lower end of the cylinder 1. Several vents 5 are provided at the same horizontal height position in the middle of the outer wall of the cylinder 1. A valve three-way connecting pipe 8, a valve two-way connecting pipe 7, and a valve one-way connecting pipe 6 are arranged sequentially from top to bottom on the upper part of the outer wall of the cylinder 1. The valve three-way connecting pipe 8, the valve two-way connecting pipe 7, and the valve one-way connecting pipe 6 are respectively connected to a set of self-powered micro-pressure valves.

[0032] The upper end of the outer wall of the float 2 is formed with a first sealing ring 9 and a second sealing ring 10. The first sealing ring 9 and the second sealing ring 10 form a sealing area at the upper end of the outer wall of the float 2. Several air holes 18 penetrating the side wall of the float 2 are opened on the center line of the sealing area. The lower end of the outer wall of the float 2 is formed with a third sealing ring 11. A traction rope 16 is installed at the center of the inner end face of the top plate of the float 2. A pressure block group is fixed at the lower part of the traction rope 16.

[0033] The top cover 3 has a passageway inside, and a zero-gravity module for balancing the weight of the float 2 is installed in the passageway.

[0034] An air inlet pipe 17 is provided inside the bottom cover 4, and the other end of the air inlet pipe 17 is connected to the controlled gas phase source.

[0035] One end of the passageway is located at the bottom center of the top cover 3, and the other end is located on the side of the top cover 3. The upper space of the top plate of the float 2 is connected to the atmosphere through the passageway. The zero-gravity module includes a tension rope 12, a positioning wheel 13, a guide wheel 14, and a counterweight block group 15. The positioning wheel 13 is located at one end of the passageway, and the guide wheel 14 is located at the other end of the passageway. The tension rope 12 passes through the passageway and is located between the positioning wheel 13 and the guide wheel 14. One end of the tension rope 12 extends into the cylinder 1 and is connected to the center of the outer end face of the top plate of the float 2. The other end of the tension rope 12 extends to the outside of the cylinder 1. The other end of the tension rope 12 is connected to a counterweight block group 15. The weight of the counterweight block group 15 is the same as the total weight of the float 2, the first sealing ring 9, the second sealing ring 10 and the third sealing ring 11. Through the counterweight block group 15, the influence of the float 2's own weight during vertical operation can be offset, thereby obtaining a more accurate response.

[0036] Float 2 is a hollow cylinder with a top plate. The hollow float 2 has a large bearing area and is sensitive to changes in gas pressure. The total stroke distance of float 2 inside cylinder 1 is L, which is divided into several working strokes L1. The number of sealing rings matches the number of pressure-regulating blocks in the pressure-regulating block group. The net distance between the first sealing ring 9 and the second sealing ring 10 is L2. The length of the net distance L2 is greater than the diameter of the valve three-way connecting pipe 8, the valve two-way connecting pipe 7, and the valve one-way connecting pipe 6. The working stroke L1 is greater than the net distance L2. When the float 2 moves one working stroke L1, the first sealing ring 9 and the second sealing ring 10 can completely cover the valve three-way connecting pipe 8, the valve two-way connecting pipe 7, or the valve one-way connecting pipe 6 to ensure the normal connection of the air circuit.

[0037] Vent 5 is located between the second sealing ring 10 and the third sealing ring 11. The lower limit of the movement of the second sealing ring 10 is above the vent 5, and the upper limit of the movement of the third sealing ring 11 is below the vent 5. The vent 5 is connected to the outside atmosphere. The space pressure between the second sealing ring 10 and the third sealing ring 11 is atmospheric pressure. The second sealing ring 10 and the third sealing ring 11 are always connected to the outside atmosphere through the vent 5, so that the pressure between the second sealing ring 10 and the third sealing ring 11 is always maintained at atmospheric pressure.

[0038] The centerline of the air hole 18 is the pressure stroke line of the float 2. The sum of the internal pressure of the float 2 and the spatial pressure in the sealing area is equal to the controlled gas source pressure. The increase or decrease of the controlled gas source pressure will synchronously change the sum of the internal pressure of the float 2 and the spatial pressure in the sealing area, thereby further adjusting the position of the float 2 in the cylinder 1 in the opposite direction.

[0039] The opening and closing pressure values ​​set for valve 1 connecting pipe 6 are P1 and P2, respectively; the closing and opening pressure values ​​set for valve 2 connecting pipe 7 are P3 and P4, respectively; and the closing and opening pressure values ​​set for valve 3 connecting pipe 8 are P5 and P6, respectively. The order of the pressure values ​​is: P1 < P2 < P3 < P4 < P5 < P6. The cylinder body 1 is sequentially arranged from bottom to top with the following lines: float bottom stroke line, float P1 stroke line, float P2 stroke line, float P3 stroke line, float P4 stroke line, float P5 stroke line, and float top stroke line. The stroke lines, the interval between adjacent stroke lines is the same as the working stroke L1, the opening pressure value P1, the closing pressure value P2, the closing pressure value P3, the opening pressure value P4, the closing pressure value P5 and the opening pressure value P6 correspond to the P1 stroke line, the P2 stroke line, the P3 stroke line, the P4 stroke line, the P5 stroke line and the top stroke line respectively. When the float 2 moves upward by one or more working strokes L1, the float 2 can be aligned with one of the P1 stroke line, the P2 stroke line, the P3 stroke line, the P4 stroke line, the P5 stroke line and the top stroke line.

[0040] The pressure-regulating block group includes a first pressure-regulating block 19, a second pressure-regulating block 20, a third pressure-regulating block 21, a fourth pressure-regulating block 22, a fifth pressure-regulating block 23, and a sixth pressure-regulating block 24, which are fixed at intervals at the lower part of the traction rope 16. The fixed intervals are the same as the working stroke L1. When the pressure stroke line of the float 2 coincides with the top stroke line, the distance between the sixth pressure-regulating block 24 and the bottom cover 4 is the same as the working stroke L1. The weight of the first pressure-regulating block 19, the second pressure-regulating block 20, the third pressure-regulating block 21, the fourth pressure-regulating block 22, the fifth pressure-regulating block 23, and the sixth pressure-regulating block 24 matches the set pressure value of the self-operated micro-pressure valve. When the float 2 moves upward by one or more working strokes L1, the corresponding first pressure-regulating block 19, the second pressure-regulating block 20, the third pressure-regulating block 21, the fourth pressure-regulating block 22, the fifth pressure-regulating block 23, and the sixth pressure-regulating block 24 rise synchronously with the float 2 to restrict the position of the float 2, so that the float 2 stays at the designated position.

[0041] The method of using a self-powered ultra-low pressure split-range controller includes the following steps:

[0042] In step S1, the controlled gas source enters the cylinder 1 through the intake pipe 17. When the thrust of the gas pressure on the force-bearing area of ​​the float 2 is less than the weight of the first constant pressure block 19, the float 2 stands vertically on the upper end face of the bottom cover 4 and remains stationary. The center line of the air hole 18 on the float 2 stays at the bottom stroke line of the float. The controlled gas source is sealed inside the float 2. At this time, the valve three-way connecting pipe 8, valve two-way connecting pipe 7 and valve one-way connecting pipe 6 are all located above the float 2 and are connected to the atmosphere through the passage. The pressure on both sides of the diaphragm of the three self-operated micro-pressure valves connected to the valve three-way connecting pipe 8, valve two-way connecting pipe 7 and valve one-way connecting pipe 6 is atmospheric pressure P0. All three self-operated micro-pressure valves are in the closed state.

[0043] In step S2, when the pressure of the controlled gas source rises to the opening pressure P1, the thrust generated by the gas pressure pushes the float 2 and the first pressure-regulating block 19 to rise synchronously by one working stroke L1. The folded portion of the traction rope 16 between the first pressure-regulating block 19 and the second pressure-regulating block 20 extends and straightens. The weight of the second pressure-regulating block 20 acts on the float 2 to prevent it from rising further. The centerline of the air hole 18 stops at the float's stroke line P1, i.e., the opening pressure value P1. The controlled gas in the float 2 cavity enters the diaphragm side of the self-operated micro-pressure valve connected to it through the valve-1 connecting pipe 6. The diaphragm side reaches the set opening pressure. When force P1 is applied, the self-operated micro-pressure valve opens. Due to the gravity constraint of the second pressure-regulating block 20, the center line of the air hole 18 remains at the center of the valve-1 connecting pipe 6 until the controlled gas pressure in the float 2 reaches the next set pressure P2. The self-operated micro-pressure valve connected to the valve-1 connecting pipe 6 is always in the open state. The valve-2 connecting pipe 7 and the valve-3 connecting pipe 8 are both located above the top plate of the float 2 and are connected to the atmosphere through the passage. The pressure on both sides of the diaphragm of the two self-operated micro-pressure valves connected to the valve-2 connecting pipe 7 and the valve-3 connecting pipe 8 is atmospheric pressure P0. Both self-operated micro-pressure valves are in the closed state.

[0044] In step S3, when the pressure of the controlled gas source rises to the shut-off pressure P2, the thrust generated by the gas pressure pushes the float 2, the first pressure-regulating block 19, and the second pressure-regulating block 20 to rise synchronously by one working stroke L1. The traction rope 16 folded between the second pressure-regulating block 20 and the third pressure-regulating block 21 extends and straightens. The weight of the third pressure-regulating block 21 acts on the float 2 to prevent the float 2 from continuing to rise. The centerline of the air hole 18 stops at the float's stroke line P2, i.e., the shut-off pressure value P2. The controlled gas is sealed inside the float 2. The valve-connecting pipe 6 is located between the second sealing ring 10 and the third sealing ring 10. Between the sealing rings 11, the controlled gas remaining on one side of the diaphragm of the valve-1 connecting pipe 6 and the self-operated micro-pressure valve connected thereto is released into the atmosphere through the vent 5. The pressure on both sides of the diaphragm of the self-operated micro-pressure valve is atmospheric pressure P0. At this time, the self-operated micro-pressure valve connected to the valve-1 connecting pipe 6 is closed. The valve-2 connecting pipe 7 and the valve-3 connecting pipe 8 are both located above the top plate of the float 2 and are connected to the atmosphere through the passage. The pressure on both sides of the diaphragm of the two self-operated micro-pressure valves connected to the valve-2 connecting pipe 7 and the valve-3 connecting pipe 8 is atmospheric pressure P0. Both self-operated micro-pressure valves are in the closed state.

[0045] Step S4: Repeat steps S1 and S3. As the controlled gas pressure in the inner cavity of the float 2 increases step by step, the controlled gas pressure gradually reaches the closing pressure value P3, the opening pressure value P4, the closing pressure value P5, and the opening pressure value P6. The controlled gas pushes the float 2 to rise step by step, which in turn drives the fourth constant pressure block 22, the fifth constant pressure block 23, and the sixth constant pressure block 24 to rise. The center line of the air hole 18 stops at the float P3 stroke line, the float P4 stroke line, the float P5 stroke line, and the float top stroke line in sequence. During this period, the valve two connecting pipe 7 and the valve three connecting pipe 8 operate in sequence.

[0046] In step S5, as the controlled gas pressure in the inner cavity of the float 2 decreases step by step, the controlled gas pressure in the inner cavity of the float 2 decreases step by step to the opening pressure value P6, the closing pressure value P5, the opening pressure value P4, and the closing pressure value P3. For each vertical descent of the float 2 by one working stroke L1, the sixth pressure-regulating block 24, the fifth pressure-regulating block 23, the fourth pressure-regulating block 22, the third pressure-regulating block 21, the second pressure-regulating block 20, and the first pressure-regulating block 19 are sequentially stacked on the upper end face of the bottom cover 4. The center line of the air hole 18 passes step by step through the float P5 stroke line, the float P4 stroke line, the float P3 stroke line, and the float P2 stroke line until it reaches the bottom stroke line of the float.

[0047] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A self-powered ultra-micro pressure split-range controller, characterized in that, The cylinder includes a cylinder body (1), a float (2), a top cover (3), and a bottom cover (4). The float (2) is located inside the cylinder body (1) and is a hollow cylinder with a top plate. The total travel distance of the float (2) inside the cylinder body (1) is... The total travel distance Divided into several work cycles ; The top cover (3) is installed on the upper end of the cylinder body (1), and the bottom cover (4) is installed on the lower end of the cylinder body (1). Several vents (5) are provided at the same horizontal height position in the middle of the outer wall of the cylinder body (1). The upper part of the outer wall of the cylinder body (1) is provided with a valve three-way connecting pipe (8), a valve two-way connecting pipe (7) and a valve one-way connecting pipe (6) in sequence from top to bottom. The valve three-way connecting pipe (8), the valve two-way connecting pipe (7) and the valve one-way connecting pipe (6) are respectively connected to a set of self-operated micro-pressure valves. The upper end of the outer wall of the float (2) is formed with a first sealing ring (9) and a second sealing ring (10). The first sealing ring (9) and the second sealing ring (10) form a sealing area on the upper end of the outer wall of the float (2). Several air holes (18) penetrating the side wall of the float (2) are opened on the center line of the sealing area. The center line of the air holes (18) is the pressure stroke line of the float (2). The lower end of the outer wall of the float (2) is formed with a third sealing ring (11). A traction rope (16) is installed at the center of the inner end face of the top plate of the float (2). A pressure block group is fixed at the lower part of the traction rope (16). The cylinder body (1) is provided with the following stroke lines from bottom to top: bottom stroke line, P1 stroke line, P2 stroke line, P3 stroke line, P4 stroke line, P5 stroke line, and top stroke line of the float. The interval between adjacent stroke lines is equal to the working stroke. same; The pressure block group includes a first pressure block (19), a second pressure block (20), a third pressure block (21), a fourth pressure block (22), a fifth pressure block (23), and a sixth pressure block (24) fixed at intervals at the lower part of the traction rope (16), with the fixed intervals corresponding to the working stroke. Similarly, when the pressure stroke line of the float (2) coincides with the top stroke line of the float, the distance between the sixth pressure block (24) and the bottom cover (4) is the same as the working stroke. Similarly, the weights of the first pressure-regulating block (19), the second pressure-regulating block (20), the third pressure-regulating block (21), the fourth pressure-regulating block (22), the fifth pressure-regulating block (23), and the sixth pressure-regulating block (24) are matched with the set pressure value of the self-operated micro-pressure valve; The top cover (3) has a passageway inside, and a zero gravity module for balancing the weight of the float (2) is installed in the passageway. An air inlet pipe (17) is provided inside the bottom cover (4), and the other end of the air inlet pipe (17) is connected to the controlled gas phase source.

2. The self-powered ultra-micro pressure split-range controller as described in claim 1, characterized in that, One end of the passageway is located at the bottom center of the top cover (3), and the other end of the passageway is located on the side of the top cover (3). The upper space of the top plate of the float (2) is connected to the atmosphere through the passageway. The zero-gravity module includes a tension rope (12), a positioning wheel (13), a guide wheel (14), and a counterweight assembly (15). The positioning wheel (13) is located at one end of the passageway, and the guide wheel (14) is located at the other end of the passageway. The tension rope (12) passes through the passageway and is located between the positioning wheel (13) and the guide wheel (14). One end of the tension rope (12) extends into the cylinder (1) and is connected to the center of the outer end face of the top plate of the float (2). The other end of the tension rope (12) extends to the outside of the cylinder (1). The other end of the tension rope (12) is provided with a counterweight assembly (15).

3. The self-powered ultra-micro pressure split-range controller as described in claim 2, characterized in that, The weight of the counterweight block group (15) is the same as the total weight of the float (2), the first sealing ring (9), the second sealing ring (10) and the third sealing ring (11).

4. The self-powered ultra-micro pressure split-range controller as described in claim 1, characterized in that, The work schedule The number of sealing rings matches the number of pressure-regulating blocks in the pressure-regulating block group, and the net distance between the first sealing ring (9) and the second sealing ring (10) is... The net spacing The length is greater than the diameter of the valve three-way connecting pipe (8), the valve two-way connecting pipe (7), and the valve one-way connecting pipe (6), the working stroke Greater than the net spacing .

5. A self-powered ultra-micro pressure split-range controller as described in claim 1, characterized in that, The vent (5) is located between the second sealing ring (10) and the third sealing ring (11). The lower limit of the second sealing ring (10) is located above the vent (5), and the upper limit of the third sealing ring (11) is located below the vent (5). The vent (5) is connected to the outside atmosphere, and the space pressure between the second sealing ring (10) and the third sealing ring (11) is atmospheric pressure.

6. A self-powered ultra-micro pressure split-range controller as described in claim 1, characterized in that, The sum of the internal pressure of the float (2) and the spatial pressure in the sealed area is equal to the pressure of the controlled gas phase source.

7. A self-powered ultra-micro pressure split-range controller as described in claim 2, characterized in that, The opening pressure value and closing pressure value set for the valve one connecting pipe (6) are P1 and P2 respectively, the closing pressure value and opening pressure value set for the valve two connecting pipe (7) are P3 and P4 respectively, and the closing pressure value and opening pressure value set for the valve three connecting pipe (8) are P5 and P6 respectively. The order of the pressure values ​​is: P1 < P2 < P3 < P4 < P5 < P6.

8. A self-powered ultra-micro pressure split-range controller as described in claim 7, characterized in that, The opening pressure value P1, closing pressure value P2, closing pressure value P3, opening pressure value P4, closing pressure value P5 and opening pressure value P6 correspond to the stroke lines of float P1, float P2, float P3, float P4, float P5 and float top respectively. The stroke lines of float P1, float P4 and float top coincide with the center lines of valve one connecting pipe (6), valve two connecting pipe (7) and valve three connecting pipe (8) respectively.

9. A method of using the self-powered ultra-micro pressure split-range controller according to any one of claims 1-8, characterized in that, Includes the following steps: Step S1: The controlled gas source enters the cylinder (1) through the intake pipe (17). When the thrust of the gas pressure on the force-bearing area of ​​the float (2) is less than the weight of the first constant pressure block (19), the float (2) stands vertically on the upper end face of the bottom cover (4) and remains stationary. The center line of the air hole (18) on the float (2) stays at the bottom stroke line of the float. The controlled gas source is sealed inside the float (2). At this time, the valve three-way connecting pipe (8), valve two-way connecting pipe (7) and valve one-way connecting pipe (6) are all located above the float (2) and are connected to the atmosphere through the passage. The pressure on both sides of the diaphragm of the three self-operated micro-pressure valves connected to the valve three-way connecting pipe (8), valve two-way connecting pipe (7) and valve one-way connecting pipe (6) is atmospheric pressure P0. All three self-operated micro-pressure valves are in the closed state. In step S2, when the pressure of the controlled gas source rises to the opening pressure value P1, the thrust generated by the gas pressure pushes the float (2) and the first constant pressure block (19) to rise synchronously for one working stroke. The folded portion of the traction rope (16) between the first pressure-regulating block (19) and the second pressure-regulating block (20) is stretched and taut. The weight of the second pressure-regulating block (20) acts on the float (2) to prevent the float (2) from rising further. The center line of the air hole (18) stops at the float's P1 stroke line, i.e., the opening pressure value P1. The controlled gas in the float (2) cavity enters the diaphragm side of the self-operated micro-pressure valve connected to it through the valve-connecting pipe (6). When the diaphragm side reaches the set opening pressure value P1, the self-operated micro-pressure valve opens. Due to the gravity limiting effect of the second pressure-regulating block (20), When the controlled gas pressure inside the float (2) does not reach the next set pressure, i.e. the closing pressure value P2, the center line of the air hole (18) remains at the center of the valve-1 connecting pipe (6). The self-operated micro-pressure valve connected to the valve-1 connecting pipe (6) is always in the open state. The valve-2 connecting pipe (7) and the valve-3 connecting pipe (8) are both located above the top plate of the float (2) and are connected to the atmosphere through the passage. The pressure on both sides of the diaphragm of the two self-operated micro-pressure valves connected to the valve-2 connecting pipe (7) and the valve-3 connecting pipe (8) is atmospheric pressure P0. Both self-operated micro-pressure valves are in the closed state. In step S3, when the pressure of the controlled gas source rises to the shut-off pressure value P2, the thrust generated by the gas pressure pushes the float (2), the first constant pressure block (19), and the second constant pressure block (20) to rise synchronously for one working stroke. The traction rope (16) folded between the second pressure block (20) and the third pressure block (21) is stretched taut. The weight of the third pressure block (21) acts on the float (2) to prevent the float (2) from continuing to rise. The center line of the air hole (18) stops at the float's P2 stroke line, i.e., the closing pressure value P2. The controlled gas is sealed inside the float (2). The valve-connecting pipe (6) is located between the second sealing ring (10) and the third sealing ring (11). The valve-connecting pipe (6) and the self-operated micro-pressure valve diaphragm connected to it... The controlled gas remaining on the side is released into the atmosphere through the vent (5). The pressure on both sides of the diaphragm of the self-operated micro-pressure valve is atmospheric pressure P0. At this time, the self-operated micro-pressure valve connected to the valve one connecting pipe (6) is closed. The valve two connecting pipe (7) and the valve three connecting pipe (8) are both located above the top plate of the float (2) and are connected to the atmosphere through the passage. The pressure on both sides of the diaphragm of the two self-operated micro-pressure valves connected to the valve two connecting pipe (7) and the valve three connecting pipe (8) is atmospheric pressure P0. Both self-operated micro-pressure valves are in the closed state. Step S4, repeat steps S1 and S3. When the controlled gas pressure in the inner cavity of the float (2) increases step by step, the controlled gas pressure gradually reaches the closing pressure value P3, the opening pressure value P4, the closing pressure value P5 and the opening pressure value P6. The controlled gas pushes the float (2) to rise step by step, which in turn drives the fourth constant pressure block (22), the fifth constant pressure block (23) and the sixth constant pressure block (24) to rise. The center line of the air hole (18) stops at the float P3 stroke line, the float P4 stroke line, the float P5 stroke line and the float top stroke line in sequence. During this period, the valve two connecting pipe (7) and the valve three connecting pipe (8) run in sequence. Step S5: As the controlled gas pressure in the inner cavity of the float (2) decreases step by step, the controlled gas pressure in the inner cavity of the float (2) decreases step by step to the opening pressure value P6, the closing pressure value P5, the opening pressure value P4, and the closing pressure value P3. The float (2) descends vertically for one working stroke. The sixth pressure block (24), the fifth pressure block (23), the fourth pressure block (22), the third pressure block (21), the second pressure block (20) and the first pressure block (19) are stacked on the upper surface of the bottom cover (4) in sequence. The center line of the air hole (18) passes through the travel line of float P5, float P4, float P3 and float P2 step by step until it reaches the travel line of the bottom of the float.

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