A membrane method helium purification device, purification system and purification method

Abstract

The present invention relates to the technical field of helium separation, and specifically relates to a membrane method helium purification device, a purification system and a purification method, including: a purifier, and two separation tanks fixed on the side wall of the purifier, and the two separation tanks are connected to each other through a first delivery pipe; a rotating rod rotatably installed in the separation tank, an axially sliding clamping ring on the rotating rod, and a separation membrane fixed on the clamping ring; a trigger discharge mechanism arranged in the separation tank and connected to the rotating rod, used to drive the rotating rod to rotate when the pressure in the separation tank increases and discharge the residual gas; a pressurizing mechanism arranged in the separation tank, and a conduction impact mechanism is arranged on the pressurizing mechanism. Through the cooperation of the pressurizing mechanism and the conduction impact mechanism, a pressure difference can be formed on both sides of the separation membrane, and when the pressure reaches a set value, through the dual cooperation of air flow impact and bidirectional pressure, the effect of rapid purification of helium can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of helium purification, and particularly to a membrane method helium purification device, a purification system and a purification method. Background Art

[0002] The membrane separation method is an efficient and energy-saving gas separation technology, which is suitable for the purification of helium (He), especially for the recovery of helium from natural gas or industrial waste gas.

[0003] Its working principle is to separate by using the difference in the permeation rate of helium and other gases in the membrane material. Helium molecules are small and inert, and their permeation rate in most membrane materials is much higher than that of other gases. During the separation process, separation is achieved by relying on the pressure difference.

[0004] During actual separation and purification, in order to ensure a certain pressure difference during the separation process, it is necessary to continuously pressurize the retentate side of the membrane. During the pressurization process, as the separation permeation amount increases, the gas is in a steady-state flow state, and it is very easy to form a concentration polarization layer on the membrane surface, which hinders the permeation of helium.

[0005] In this regard, by setting a conduction plate, the retentate side of the membrane is first pressurized and then conducted. After the pressure reaches the threshold value, the conduction plate is controlled to conduct, so that the high-pressure gas performs separation permeation by impact, so as to improve the separation and purification efficiency of helium.

[0006] However, although the high-pressure impact can temporarily destroy the concentration polarization layer, under the fixed membrane structure, the separation of helium can only be affected by the unidirectional force of positive pressure, and there will be a "dead zone" remaining on the membrane surface. The heavy components will still accumulate on the membrane surface due to the action of gravity, resulting in uneven concentration distribution on the membrane surface and a decrease in the separation permeation rate. Summary of the Invention

[0007] The purpose of the present invention is to provide a membrane method helium purification device, a purification system and a purification method to solve the problems raised in the above background art.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A membrane method helium purification device includes:

[0010] A purifier, and two separation tanks fixed on the side wall of the purifier. The two separation tanks are connected to each other through a first conveying pipe;

[0011] It further includes:

[0012] A rotating rod, rotatably installed in the separation tank. A clamping ring that is hermetically and slidably connected to the separation tank axially slides on the rotating rod, and a separation membrane is fixed on the clamping ring;

[0013] a trigger discharge mechanism, which is disposed in the separation tank and connected to the rotating rod, and is used to drive the rotating rod to rotate when the pressure in the separation tank increases, and discharge the residual gas;

[0014] The boosting mechanism is arranged in the separation tank, and a conductive impact mechanism is arranged on the boosting mechanism. The conductive impact mechanism can form a pressure difference on both sides of the separation membrane when the boosting mechanism moves, and when the pressure in the separation tank reaches a set threshold, control the gas to impact toward the separation membrane.

[0015] As a further solution of the present invention: the boosting mechanism includes an air supply disk fixed on the clamping ring, the side wall of the air supply disk is formed with an arc groove, a sliding block is slidably installed in the arc groove, a sealing disk tightly fitted with the air supply disk is fixed on the sliding block, and the air supply disk and the sealing disk are respectively formed with a first conducting hole and a second conducting hole which are equidistantly distributed around the circumference and are connected and cooperate with each other.

[0016] As a further solution of the present invention: the boosting mechanism further comprises a cylinder fixed on the separation tank, and a push plate fixedly connected to the clamping ring is fixed at the telescopic end of the cylinder.

[0017] As a further solution of the present invention: the conduction impact mechanism includes an inclined block fixed on the sealing disk, the rotating rod axially slides with a rotating sleeve rotatably connected to the air supply disk, and a supporting ring is fixed on the rotating sleeve.

[0018] As a further solution of the present invention: the conductive impact mechanism also includes a support sleeve fixed on the support ring, a support rod axially sliding in the support sleeve, a movable plate fixed to the end of the support rod, a limiting column fixed on the movable plate that abuts against the tilting block, a first spring is sleeved on the support sleeve and the support rod, and two ends of the first spring are respectively abutted against the support ring and the movable plate.

[0019] As a further solution of the present invention: the trigger discharge mechanism comprises a guide column fixed in the separation tank, and a fixing ring is fixed on the guide column;

[0020] It also includes a blocking component and a guiding component which are arranged on the guide column and are used to adjust the conduction state of the separation tank and drive the rotating rod to rotate.

[0021] As a further solution of the present invention: the blocking assembly includes a guide sleeve axially sliding along the guide column, the guide sleeve axially slidingly has a follower plate slidably connected to the rotating rod, and the follower plate is formed with an exhaust hole;

[0022] It also includes a limit ring and a blocking plate fixed on both sides of the guide sleeve, the blocking plate is in abutment with the follower plate, a second spring is sleeved on the guide sleeve, and two ends of the second spring are respectively in abutment with the limit ring and the follower plate.

[0023] As a further solution of the present invention: the guide assembly includes a guide groove formed on the circumferential outer wall of the rotating rod, a limit block is fixed to the inner wall of the movable plate and is slidably engaged with the guide groove, and a third spring is sleeved on the rotating rod, and both ends of the third spring are respectively in contact with the inner wall of the separation tank and the movable plate.

[0024] A membrane helium purification system comprises the membrane helium purification device.

[0025] A membrane helium purification method comprises the following steps:

[0026] Step 1: The gas to be purified is transported into the separation tank, and under the action of the booster mechanism, the clamping ring and the separation membrane are controlled to slide along the axial direction of the separation tank;

[0027] Step 2: Under the action of the clamping ring and the separation membrane, the pressure in the separation tank increases, thereby driving the trigger discharge mechanism to move, so as to control the rotation of the rotating rod;

[0028] Step 3: Under the action of the rotating rod, the conduction impact mechanism is controlled to move. When the pressure in the separation tank reaches the set value, the conduction impact mechanism controls the gas in the separation tank to impact on the separation membrane;

[0029] Step 4: When the purification is completed, the booster mechanism continues to move, and under the action of pressure, the control triggers the discharge mechanism to move, so that the separation tank is turned on to discharge the residual gas in the separation tank.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application can realize the separation and purification of helium through the dual effects of positive pressure and negative pressure, and the high-speed impact of airflow on the separation membrane. Specifically, through the boosting mechanism, when the separation membrane is in an isolated state, the pressure on the interception side can be increased, and a negative pressure can be formed on the permeation side. At the same time, under the action of pressure, the rotation of the rotating rod is controlled by triggering the discharge mechanism to drive the movement of the conduction impact mechanism. When the pressure reaches the set value, the conduction of the separation membrane is controlled by the conduction impact mechanism to control the high-pressure airflow to impact on the separation membrane, thereby enhancing the separation and purification rate and effect of helium.

[0031] By operating on the gas on the retention side to increase the pressure first and then conduct it, it can ensure that the partial pressure of helium is high enough, maximize the permeation driving force, and avoid ineffective permeation at low pressure. At the same time, when high-pressure gas passes through the second through-hole and the first through-hole, the gas flow is further accelerated and impacts on the surface of the separation membrane, which can not only break the stagnant layer on the membrane surface, reduce concentration polarization, but also form an instantaneous low-pressure area near the first through-hole to further pull the permeation of helium. At the same time, under the impact of the gas flow, it can also avoid the problem of separation membrane blockage caused by the enrichment of heavy components.

[0032] By controlling the rotation of the rotating rod, it can achieve that when purifying helium, the separation membrane is in the conducting state, and when the helium purification is completed and in the state of needing to exhaust gas, the separation membrane is in the blocking state, which can not only prevent the problem of separation membrane damage caused by excessive exhaust pressure, but also prevent the problem of helium backflow on the permeation side caused by the conduction of the separation membrane during the exhaust process. At the same time, through the multi-stage purification of two separation tanks, it can ensure that the purified helium meets the required standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of an embodiment of a membrane method helium purification device.

[0034] Figure 2 It is a schematic structural diagram of a separation tank, a first delivery pipe, and a discharge pipe in an embodiment of a membrane method helium purification device.

[0035] Figure 3 It is a schematic sectional structural diagram of a separation tank in an embodiment of a membrane method helium purification device.

[0036] Figure 4 For Figure 3 The enlarged structural diagram at position A in

[0037] Figure 5 It is a schematic structural diagram inside a separation tank in an embodiment of a membrane method helium purification device.

[0038] Figure 6 For Figure 5 The structural diagram from another angle.

[0039] Figure 7 It is a schematic connection diagram of a partial pressurization mechanism and a conduction impact mechanism in an embodiment of a membrane method helium purification device.

[0040] Figure 8 It is an exploded structural diagram of a partial pressurization mechanism and a conduction impact mechanism in an embodiment of a membrane method helium purification device.

[0041] Figure 9 It is a schematic structural diagram of a partial trigger discharge mechanism and a rotating rod in an embodiment of a membrane method helium purification device.

[0042] Figure 10 Schematic diagram of the explosion structure of the trigger discharge mechanism and the rotating rod in an embodiment of a membrane method helium purification device.

[0043] Figure 11 is Figure 10 Enlarged schematic diagram of the structure at position B in

[0044] In the figure: 1, purifier; 2, separation tank; 3, feed pipe; 4, discharge pipe; 5, first conveying pipe; 6, second conveying pipe; 7, guide post; 8, fixing ring; 9, rotating rod; 901, first straight groove; 902, first spiral groove; 903, second spiral groove; 904, second straight groove; 10, clamping ring; 11, separation membrane; 12, cylinder; 13, push plate; 14, air supply disc; 1401, first guide through hole; 1402, arc chute; 15, rotating sleeve; 16, sealing disc; 1601, second guide through hole; 1602, sliding block; 17, inclined block; 18, support ring; 19, support sleeve; 20, support rod; 21, movable plate; 22, first spring; 23, limit post; 24, guide sleeve; 2401, limit ring; 25, blocking plate; 26, follower disc; 2601, exhaust hole; 2602, limit block; 27, second spring; 28, third spring. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] In addition, an element in the present invention is referred to as being "fixed to" or "disposed on" another element, and it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manners.

[0047] Please refer to Figures 1 to 11 , in an embodiment of the present invention, a membrane method helium purification device includes:

[0048] A purifier 1 and two separation tanks 2 fixed to the side wall of the purifier 1, and the two separation tanks 2 are interconnected through a first conveying pipe 5;

[0049] It further includes:

[0050] The rotating rod 9 is rotatably installed inside the separation tank 2. An axially sliding clamping ring 10 that is hermetically and slidably connected to the separation tank 2 is arranged on the rotating rod 9, and a separation membrane 11 is fixed on the clamping ring 10.

[0051] The trigger discharge mechanism is arranged inside the separation tank 2 and is connected to the rotating rod 9, and is used to drive the rotation of the rotating rod 9 when the pressure inside the separation tank 2 increases, and discharge the residual gas.

[0052] The pressurizing mechanism is arranged inside the separation tank 2. A conduction impact mechanism is arranged on the pressurizing mechanism. The conduction impact mechanism can form a pressure difference on both sides of the separation membrane 11 when the pressurizing mechanism moves, and control the gas to impact towards the direction of the separation membrane 11 when the pressure inside the separation tank 2 reaches the set threshold.

[0053] Specifically, there are two separation tanks 2, which are respectively used for primary purification and secondary purification of helium. An inlet pipe 3 connected to the purifier 1 is connected to the separation tank 2 for primary purification, and this inlet pipe 3 is used to transport the unpurified gas into the separation tank 2. A second delivery pipe 6 for transporting the helium after secondary purification is connected to the separation tank 2 for secondary purification. One ends of the two separation tanks 2 facing away from the first delivery pipe 5 are connected with a discharge pipe 4 for discharging the residual gas. When separating and purifying helium, the untreated gas can be transported into the primary separation tank 2 through the inlet pipe 3. At this time, under the action of the conduction impact mechanism, the separation membrane 11 is in a separated state from the gas. Under the action of the pressurizing mechanism, the separation membrane 11 is controlled to move in a direction away from the first delivery pipe 5 through the clamping ring 10, so that the pressure on the retention side increases, and a negative pressure is formed on the permeation side. The pressure will also push the trigger discharge mechanism to move, causing the rotating rod 9 to rotate. The rotating rod 9 will drive the conduction impact mechanism to move. When the pressure on the retention side reaches the set value, the conduction impact mechanism can control the gas on the retention side to impact the separation membrane 11 at a higher pressure, thereby accelerating the passage of helium through the separation membrane 11. At the same time, under the action of the negative pressure on the permeation side, it further assists in the purification process of helium. When the purification of helium is completed, the pressurizing mechanism continues to move, causing the pressure on the retention side to continue to increase, and controlling the trigger discharge mechanism to move, causing the rotating rod 9 to rotate back. At this time, the conduction impact mechanism will once again control the separation membrane 11 to be in a blocking state to ensure that helium will not flow back during the gas discharge process. When the pressure reaches a certain level, the trigger discharge mechanism controls the separation tank 2 to conduct, so that the residual gas can be discharged through the discharge pipe 4. The helium after primary purification will be transported into the separation tank 2 for secondary purification through the first delivery pipe 5, and through the above operations again, the gas after primary purification can obtain the effect of secondary purification under the dual cooperation of high-pressure impact and negative-pressure attraction. The gas after secondary purification can be transported to the storage location through the second delivery pipe 6.

[0054] See also Figures 1 - 3 , Figures 5 - 8 The boosting mechanism includes an air supply disk 14 fixed on the clamping ring 10, and the side wall of the air supply disk 14 is formed with an arc groove 1402, and a sliding block 1602 is slidably installed in the arc groove 1402, and a sealing disk 16 tightly fitted with the air supply disk 14 is fixed on the sliding block 1602, and the air supply disk 14 and the sealing disk 16 are respectively formed with a first conducting hole 1401 and a second conducting hole 1601 that are equidistantly distributed around the circumference and are interconnected and coordinated with each other, and the boosting mechanism also includes a cylinder 12 fixed on the separation tank 2, and a push plate 13 fixedly connected to the clamping ring 10 is fixed at the telescopic end of the cylinder 12.

[0055] See also Figure 5 , Figure 6 In detail, in the initial state, the clamping ring 10 is located at the end of the stroke toward the first delivery pipe 5, so that the cavity size on the retention side in the separation tank 2 is the largest, and the cavity size on the permeate side is the smallest, and the cavity on the retention side is filled with unpurified gas, the first conducting hole 1401 and the second conducting hole 1601 are in a separated state, and the sealing disk 16 is tightly fitted with the air supply disk 14, so the separation membrane 11 cannot contact the gas on the retention side; the sealing disk 16 is limited to control the first conducting hole 1401 to rotate toward the conducting position with the second conducting hole 1601, which is forward rotation, and vice versa. Under the action of the conducting impact mechanism, the sealing disk 16 has a tendency to reverse. Since the sliding block 1602 is located at the end of the stroke on one side of the arc slide groove 1402, the sealing disk 16 cannot rotate.

[0056] When it is necessary to purify the gas on the trapped side, the valves of the feed pipe 3 and the first delivery pipe 5 can be closed, so that the cavities on the trapped side and the permeate side are in a blocked state. At this time, the cylinder 12 works and pushes the clamping ring 10 to move in a direction away from the first delivery pipe 5 through the push plate 13. The clamping ring 10 also drives the sealing plate 16 to move synchronously through the air delivery plate 14, so that the cavity size on the trapped side is reduced and the cavity size on the permeate side is increased, so that the pressure of the gas on the trapped side is increased and a negative pressure is formed on the permeate side. Under the action of the pressure, the discharge mechanism is also triggered to move, so that the rotating rod 9 rotates, and the rotating rod 9 will drive the conduction impact mechanism to move. In this process, the pressure on the trapped side continues to increase, the gas molecules are compressed, and the helium partial pressure increases significantly.

[0057] When the pressure on the retention side increases to the set value, under the action of the conduction impact mechanism, the control seal disc 16 rotates quickly in the positive direction, driving the sliding block 1602 to slide towards the other side of the arc-shaped chute 1402. The seal disc 16 also controls the second guide hole 1601 to quickly move to the position where it is connected to the first guide hole 1401. At this time, the high-pressure gas will quickly pass through the second guide hole 1601 and the first guide hole 1401 and impact on the separation membrane 11. At the same time, under the attraction of the negative pressure on the permeation side, the separation of helium is further accelerated.

[0058] Preferably, by first pressurizing and then conducting the gas on the retention side, it can ensure that the partial pressure of helium is high enough, maximize the permeation driving force, and avoid ineffective permeation at low pressure. At the same time, when the high-pressure gas passes through the second guide hole 1601 and the first guide hole 1401, the airflow is further accelerated and then impacts on the surface of the separation membrane 11. This can not only break the stagnant layer on the membrane surface, reduce concentration polarization, but also form an instantaneous low-pressure area near the first guide hole 1401 to further pull the permeation of helium. In summary, through the dual action of positive pressure and negative pressure, as well as the impact of high-speed airflow, the purification efficiency of helium can be effectively enhanced.

[0059] Please refer to Figure 5 、 Figure 6 、 Figures 9 - 11 As shown in [relevant figures], the triggering and discharging mechanism includes a guide post 7 fixed in the separation tank 2, and a fixed ring 8 is fixed on the guide post 7; it also includes a plugging component and a guiding component arranged on the guide post 7 for adjusting the conduction state of the separation tank 2 and driving the rotating rod 9 to rotate. The plugging component includes a guide sleeve 24 sliding axially along the guide post 7, and a follower disc 26 sliding axially on the guide sleeve 24 and slidably connected to the rotating rod 9. An exhaust hole 2601 is formed on the follower disc 26; it also includes a limit ring 2401 and a plugging plate 25 fixed on both sides of the guide sleeve 24. The plugging plate 25 is in contact and cooperation with the follower disc 26. A second spring 27 is sleeved on the guide sleeve 24, and both ends of the second spring 27 are in contact with the limit ring 2401 and the follower disc 26 respectively. The guiding component includes a guiding groove formed on the circumferential outer wall of the rotating rod 9, and a limit block 2602 fixedly installed on the inner wall of the follower disc 26 and slidably fitted with the guiding groove. A third spring 28 is sleeved on the rotating rod 9, and both ends of the third spring 28 are in contact with the inner wall of the separation tank 2 and the follower disc 26 respectively.

[0060] Please refer to Figure 11, It should be noted that the guiding groove can be divided into four sections, namely the first straight groove 901, the first spiral groove 902, the second spiral groove 903, and the second straight groove 904, which are connected to each other in sequence. The number of spiral turns of the first spiral groove 902 and the second spiral groove 903 is the same, but the pitch is different. Therefore, the length formed by the first spiral groove 902 along the rotating rod 9 is greater than that of the second spiral groove 903;

[0061] Please refer to Figure 9 , In the initial state, the pressure in the intercepting side cavity is the same as the external pressure. The follower disk 26 is not subjected to the thrust of air pressure, and the third spring 28 is in a compressed state, so that the follower disk 26 is located at the end of the stroke in the direction away from the discharge pipe 4, so that the limiting block 2602 is located at the end of the stroke on the side of the first straight groove 901 away from the first spiral groove 902. The second spring 27 is also in a compressed state, and the guiding sleeve 24 is controlled by the limiting ring 2401 to have a tendency to move away from the follower disk 26. Under the action of the guiding sleeve 24, the sealing plate 25 is closely attached to the follower disk 26 and blocks the exhaust hole 2601, so that the side of the intercepting side cavity away from the separation membrane 11 is in a blocked state. Since the first through hole 1401 and the second through hole 1601 are in a separated state, both sides of the intercepting side cavity are in a blocked state;

[0062] When helium needs to be purified, at this time, under the action of the cylinder 12, the sealing disk 16 is controlled to move towards the follower disk 26, so that the pressure in the intercepting side cavity increases. The thrust generated by the pressure will act on the follower disk 26 and push the follower disk 26 towards the discharge pipe 4, thereby compressing the third spring 28. Under the action of the second spring 27, the sealing plate 25 follows the follower disk 26 to move synchronously to ensure that the exhaust hole 2601 is always in a blocked state;

[0063] The follower disk 26 will also drive the limiting block 2602 to slide along the first straight groove 901. When the limiting block 2602 disengages from the first straight groove 901 and enters the first spiral groove 902, the rotating rod 9 will rotate, thereby driving the conduction impact mechanism to move. At this time, the conduction impact mechanism always provides a reverse rotation force to the sealing disk 16. When the gas pressure in the intercepting side cavity reaches the set value, the limiting block 2602 is still located in the first spiral groove 902. Under the action of the conduction impact mechanism, the reverse rotation force provided to the sealing disk 16 is converted into a forward rotation force that assists the sealing disk 16 to rotate forward, thereby controlling the sealing disk 16 to rotate quickly, so that the second through hole 1601 moves to the position where it is connected to the first through hole 1401, and the gas on the intercepting side will pass through the second through hole 1601 and the first through hole 1401 and impact on the surface of the separation membrane 11, so as to quickly separate and purify helium through the separation membrane 11.

[0064] During this process, as helium is separated, the air pressure on the retention side decreases. However, the cylinder 12 can continue to control the sealing disc 16 to move towards the follower disc 26 to keep the retention side under a certain high pressure all the time, resulting in a relatively small change in the position of the follower disc 26 and ensuring the best separation effect for helium.

[0065] If the helium content in the gas to be purified at the first stage is relatively high, after helium separation, the amount of residual gas is small. Therefore, there is no need to discharge the residual gas. After the first-stage purification is completed, the separation membrane 11 can be controlled to reset, and the untreated gas can be filled into the separation tank 2 again. If the amount of residual gas after helium separation is large, when the sealing disc 16 continues to move towards the follower disc 26, the air pressure on the retention side continues to rise, pushing the follower disc 26 to continue moving. By increasing the pressure on the retention side again, a small amount of residual helium in the gas can be separated and purified. When the limit block 2602 disengages from the first spiral groove 902 and enters the second spiral groove 903, it indicates that the first-stage purification of helium is completed. The rotating rod 9 rotates in the reverse direction, driving the conduction impact mechanism to move, causing the sealing disc 16 to rotate in the reverse direction, so that the second through hole 1601 is separated from the first through hole 1401, and the separation membrane 11 is in a blocked state again. When the limit block 2602 disengages from the second spiral groove 903 and enters the second straight groove 904, the limit ring 2401 just moves to the position where it abuts against the fixed ring 8, causing the guide sleeve 24 and the blocking plate 25 to stop moving. When the follower disc 26 continues to move, it will separate from the blocking plate 25, making the exhaust hole 2601 conductive. Under high pressure, the residual gas in the retention side can be quickly discharged through the exhaust hole 2601 and the discharge pipe 4. After the discharge is completed, the cylinder 12 controls the clamping ring 10 to move towards the initial position.

[0066] Among them, when discharging the gas, the first delivery pipe 5 is in an open state to transport the gas on the permeation side through the first delivery pipe 5 into the separation tank 2 for secondary purification. The separation tank 2 for secondary purification can repeat the operations in the separation tank 2 for primary purification to perform secondary purification on helium. Since the amount of other impurity gases in the helium after primary purification is small, exhaust treatment can be carried out after multiple secondary purifications.

[0067] Preferably, by controlling the rotation of the rotating rod 9, it is possible to control the separation membrane 11 to be in a conductive state during the purification of helium, and to control the separation membrane 11 to be in a blocked state when the purification of helium is completed and in a state where exhaust is required. This can not only prevent the problem of damage to the separation membrane 11 due to excessive exhaust pressure, but also prevent the problem of helium on the permeation side flowing back due to the separation membrane being conductive during the exhaust process. At the same time, through the multi-stage purification of the two separation tanks 2, it can be ensured that the purified helium meets the required standards.

[0068] Please refer to Figures 3 - 8, the conduction impact mechanism includes an inclined block 17 fixed on the sealing disc 16. An axially slidable rotating sleeve 15 is provided on the rotating rod 9 and is rotatably connected to the air supply disc 14. A support ring 18 is fixed on the rotating sleeve 15. The conduction impact mechanism further includes a support sleeve 19 fixed on the support ring 18. A support rod 20 is axially slidable in the support sleeve 19. An end of the support rod 20 is fixed with a movable plate 21. A limit post 23 that is in contact and cooperation with the inclined block 17 is fixed on the movable plate 21. A first spring 22 is sleeved on the support sleeve 19 and the support rod 20. Two ends of the first spring 22 are respectively abutted against the support ring 18 and the movable plate 21.

[0069] Please refer to Figure 7 , further, the inclined block 17 is arranged in a triangular inclined shape, and the inclination angles of the two inclined surfaces are different. Divided by the positive or reverse force provided to the sealing disc 16 when the limit post 23 is in contact and cooperation with the inclined block 17, the two inclined surfaces are defined as a positive rotation surface and a reverse rotation surface, and the inclination angle of the reverse rotation surface is greater than that of the positive rotation surface;

[0070] In the initial state, the first spring 22 is in a compressed state, so that the movable plate 21 is at the end of the stroke in the direction away from the support sleeve 19, so that the limit post 23 abuts against the reverse rotation surface. At this time, the sealing disc 16 has a tendency to rotate in reverse. As the pressure on the interception side increases, the follower disc 26 will axially slide along the guide post 7, so that the limit block 2602 slides in the guide groove. When the limit block 2602 moves to the first spiral groove 902, the rotating rod 9 will rotate and drive the rotating sleeve 15 to rotate, thereby driving the support sleeve 19 to move through the support ring 18, so as to drive the limit post 23 to slide on the reverse rotation surface through the support rod 20 and the movable plate 21 and move in the direction towards the support ring 18 to compress the first spring 22. At this time, the reverse force provided to the sealing disc 16 by the limit post 23 and the reverse rotation surface increases. As the first spring 22 is compressed, the resistance required for the rotating rod 9 to rotate also increases;

[0071] When the pressure on the interception side reaches the set value, the limit post 23 just crosses the reverse rotation surface and abuts against the positive rotation surface. At this time, the first spring 22 elastically releases, and the thrust provided by the limit post 23 to the positive rotation surface is converted into the rotational force for the positive rotation of the sealing disc 16, thereby controlling the rapid rotation of the sealing disc 16, so that the second through hole 1601 moves to the position where it is in communication with the first through hole 1401 to perform separation processing on the gas on the interception side.

[0072] After the helium separation is completed, under the action of the cylinder 12, the gas on the retention side continues to be compressed. The follower disk 26 moves relative to it, causing the limit block 2602 to move into the second spiral groove 903, so that the rotating rod 9 rotates in reverse. Since the pitch of the second spiral groove 903 is smaller than that of the first spiral groove 902, therefore, only a small increase in the pressure on the retention side is required for the rotating rod 9 to rotate to the initial angle. And because the inclination angle of the forward rotation surface is smaller than that of the reverse rotation surface, for this reason, the resistance provided by the limit post 23 and the forward rotation surface to the rotating rod 9 is also smaller, ensuring that the sealing disk 16 can be reset with a relatively small increase in pressure.

[0073] Preferably, due to the different inclination angles of the two inclined surfaces of the inclined block 17, different rotational resistances can be provided to the rotating rod 9 in cooperation with the limit post 23, so as to automatically adjust the conduction state of the separation membrane 11 according to the pressure change in the cavity on the retention side. This can not only enhance the separation effect of helium, but also ensure that when discharging gas under high pressure, the separation membrane 11 is controlled to be in a blocked state to protect the separation membrane 11.

[0074] A membrane method helium purification system includes the membrane method helium purification device described above.

[0075] A membrane method helium purification method includes the following steps:

[0076] Step 1: Convey the gas to be purified into the separation tank 2. Under the action of the pressurizing mechanism, control the clamping ring 10 and the separation membrane 11 to slide axially along the separation tank 2.

[0077] Step 2: Under the action of the clamping ring 10 and the separation membrane 11, increase the pressure in the separation tank 2, thereby driving the trigger discharge mechanism to move to control the rotation of the rotating rod 9.

[0078] Step 3: Under the action of the rotating rod 9, control the conduction impact mechanism to move. When the pressure in the separation tank 2 reaches the set value, the conduction impact mechanism controls the gas in the separation tank 2 to impact on the separation membrane 11.

[0079] Step 4: When the purification is completed, the pressurizing mechanism continues to move. Under the action of the pressure, control the trigger discharge mechanism to move, making the separation tank 2 conductive to discharge the residual gas in the separation tank 2.

[0080] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0081] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A membrane helium purification device, comprising: A purifier, and two separation tanks fixed to the side wall of the purifier, wherein the two separation tanks are connected to each other through a first delivery pipe; It is characterized by further comprising: A rotating rod is rotatably mounted in the separation tank, the rotating rod is axially slidably provided with a clamping ring which is sealingly and slidably connected with the separation tank, and a separation membrane is fixed on the clamping ring; A trigger discharge mechanism is arranged in the separation tank and connected to the rotating rod, and is used to drive the rotating rod to rotate when the pressure in the separation tank increases, and discharge the residual gas. When the gas needs to be discharged, the separation membrane is controlled to be in a blocked state; A booster mechanism is arranged in the separation tank, and a conduction impact mechanism is arranged on the booster mechanism, and the conduction impact mechanism can form a pressure difference on both sides of the separation membrane when the booster mechanism moves, and when the pressure in the separation tank reaches a set threshold, control the gas to impact toward the separation membrane; The boost mechanism comprises an air delivery disk fixed on the clamping ring, a circular arc groove is formed on the side wall of the air delivery disk, a sliding block is slidably installed in the circular arc groove, a sealing disk tightly fitted with the air delivery disk is fixed on the sliding block, and the air delivery disk and the sealing disk are respectively formed with first conducting holes and second conducting holes which are equidistantly distributed around the circumference and are mutually conductive and matched; The conduction impact mechanism comprises an inclined block fixed on the sealing disk, the rotating rod axially slides with a rotating sleeve rotatably connected to the air delivery disk, a supporting ring is fixed on the rotating sleeve, the inclined block is arranged in a triangular inclined shape, and the inclination angles of the two inclined surfaces are different; The conduction impact mechanism also includes a support sleeve fixed on the support ring, a support rod axially sliding in the support sleeve, a movable plate fixed to the end of the support rod, a limit column fixed to the movable plate that abuts against the tilting block, a first spring sleeved on the support sleeve and the support rod, and two ends of the first spring abut against the support ring and the movable plate respectively; The trigger discharge mechanism comprises a guide column fixed in the separation tank, and a fixing ring is fixed on the guide column; It also includes a blocking component and a guiding component which are arranged on the guide column and are used to adjust the conduction state of the separation tank and drive the rotating rod to rotate; The blocking assembly comprises a guide sleeve axially sliding along the guide column, the guide sleeve axially slidingly has a follower plate slidably connected to the rotating rod, and the follower plate is formed with an exhaust hole; The guide assembly comprises a guide groove formed on the outer circumferential wall of the rotating rod, and a limit block slidably engaged with the guide groove is fixed on the inner wall of the follower plate; The guide groove is divided into four sections, namely the first straight groove, the first spiral groove, the second spiral groove, and the second straight groove, and they are connected to each other in sequence. The first spiral groove and the second spiral groove have the same number of spiral turns and different pitches. The length of the first spiral groove along the axial direction of the rotating rod is greater than that of the second spiral groove.

2. The membrane method helium purification device according to claim 1, wherein The boosting mechanism further comprises a cylinder fixed on the separation tank, and a push plate fixedly connected to the clamping ring is fixed on the telescopic end of the cylinder.

3. The membrane method helium purification device according to claim 1, characterized in that, The blocking assembly also includes a limit ring and a blocking plate fixed on both sides of the guide sleeve, the blocking plate is in abutment with the follower disk, a second spring is sleeved on the guide sleeve, and two ends of the second spring are respectively in abutment with the limit ring and the follower disk.

4. A membrane method helium purification device according to claim 3, characterized in that, A third spring is sleeved on the rotating rod, and two ends of the third spring are respectively in contact with the inner wall of the separation tank and the follower plate.

5. A membrane method helium purification system, characterized in that, It comprises the membrane helium purification device as claimed in claim 1.

6. A membrane method for helium purification, which uses the membrane method helium purification device as described in claim 1, is characterized in that, The following steps are involved: Step 1: The gas to be purified is transported into the separation tank, and under the action of the booster mechanism, the clamping ring and the separation membrane are controlled to slide along the axial direction of the separation tank; Step 2: Under the action of the clamping ring and the separation membrane, the pressure in the separation tank increases, thereby driving the trigger discharge mechanism to move, so as to control the rotation of the rotating rod; Step 3: Under the action of the rotating rod, the conduction impact mechanism is controlled to move. When the pressure in the separation tank reaches the set value, the conduction impact mechanism controls the gas in the separation tank to impact on the separation membrane; Step 4: When the purification is completed, the booster mechanism continues to move, and under the action of pressure, the control triggers the discharge mechanism to move, so that the separation tank is turned on to discharge the residual gas in the separation tank.

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