Hydraulic pressure and suction tower structure with detection feedback function

Abstract

The application provides a hydraulic pressure compacting adsorption tower structure with a detection feedback function, and mainly relates to the technical field of pressure swing adsorption equipment. The hydraulic pressure compacting adsorption tower structure with the detection feedback function comprises an adsorption tower cylinder, an upper cover and a hydraulic pressure compacting module. The upper cover is detachably fixed at the top end of the adsorption tower cylinder through a bolt assembly. The adsorption tower cylinder is filled with granular molecular sieve. A sieve plate, a stainless steel wire mesh pad and a pressing plate are sequentially stacked in the axial direction above the molecular sieve. The detection end of an electric contact pressure gauge is in communication with the piston cavity of the hydraulic pressure compacting module, and the signal output end thereof can be externally connected to a PLC control system to realize pressure alarm and compacting state feedback. The structure is widely applied. The hydraulic pressure compacting module has the advantages of manual compacting, low cost, high reliability, large compacting force, good stability, adjustable design of the compacting rod length, oil leakage prevention, double anti-reverse prevention and the like. Moreover, the compacting state can be monitored and fed back in real time, and the invalidation of the molecular sieve can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the technical field of pressure swing adsorption equipment, and particularly relates to a hydraulic pressure compacting adsorption tower structure with a detection feedback function. BACKGROUND

[0002] As a core technology in the field of gas separation and purification, pressure swing adsorption technology is widely used in normal temperature air oxygen / nitrogen production, hydrogen purification and recovery, industrial tail gas purification, and gas drying, etc. The core principle of the technology is to use the selective adsorption and desorption characteristics of molecular sieve to target gas under different pressures, and to realize the efficient separation of mixed gas by alternately changing the pressure in the adsorption tower. In the pressure swing adsorption equipment, the packing state and compacting stability of the granular molecular sieve directly determine the separation efficiency and service life of the equipment. Since there are natural gaps between the molecular sieve particles, it is difficult to achieve absolute dense packing during the packing process. Moreover, during the operation of the equipment, periodic gas flow impact will cause the molecular sieve to gradually sink, resulting in the formation of empty space in the upper part of the adsorption tower.

[0003] In the prior art, there are mainly three types of pain points in the compacting scheme for molecular sieve: firstly, although the traditional mechanical compacting structure (such as spring compacting and bolt tightening) has a low cost, the compacting force adjustment precision is poor, and long-term operation is prone to looseness due to vibration, resulting in a fast decay rate of the compacting force (the decay amount is often more than 3 MPa after 1000 hours of operation), the molecular sieve is prone to displacement and collision under the impact of gas flow, and the pulverization rate is as high as more than 5%, and the service life is only 1.5-2 years; secondly, although some hydraulic compacting structures have a large initial compacting force, they lack effective detection feedback mechanisms, and the molecular sieve compacting state needs to be checked regularly, which not only increases the downtime maintenance time (more than 45 minutes for a single maintenance), but also easily damages the sealing performance of the adsorption tower due to repeated disassembly and assembly, resulting in gas leakage or contamination of the molecular sieve by external impurities; thirdly, the sealing and leakage prevention design of the existing structure is not perfect, and the sealing elements of the hydraulic compacting module are mostly single O-rings, which are prone to hydraulic oil leakage (more than 80 mL per year) during long-term high-pressure operation. The attachment of leaked oil to the surface of the molecular sieve will directly damage its adsorption activity, further shorten the service life of the molecular sieve, and increase the environmental protection treatment cost.

[0004] In addition, the existing structure lacks a self-adaptive compensation design for the sinking of the molecular sieve. When the molecular sieve sinks due to long-term use, manual frequent pressure compensation or adjustment of the compacting components is required, with a maintenance frequency of once a month. This not only increases the labor cost, but also easily leads to a decrease in the stability of the equipment operation (such as a nitrogen purity fluctuation of more than 0.15%) due to untimely pressure compensation. In summary, the molecular sieve compacting structure of the current pressure swing adsorption equipment has deficiencies in compacting force stability, state monitoring convenience, self-adaptive compensation ability, and sealing and leakage prevention performance. Therefore, there is an urgent need for a hydraulic pressure compacting adsorption tower structure with detection feedback function, high stability, and low maintenance cost to solve the above technical pain points. SUMMARY

[0005] To solve the problems of the prior art, the hydraulic compression adsorption tower structure with detection feedback function is provided, which has the advantages of manual compression, low cost, high reliability, large compression force, good stability, adjustable design of compression rod length, oil leakage prevention, double anti-reverse and the like, and can realize real-time monitoring and feedback of the compression state and effectively avoid the failure of molecular sieve.

[0006] To achieve the above-mentioned purpose, the following technical solutions are adopted:

[0007] The hydraulic compression adsorption tower structure with detection feedback function comprises an adsorption tower cylinder body, an upper cover and a hydraulic compression module, the upper cover is detachably fixed at the top end of the adsorption tower cylinder body through a bolt assembly, the adsorption tower cylinder body is filled with granular molecular sieve, a sieve plate, a stainless steel wire mesh pad and a pressing plate are sequentially stacked in the axial direction above the molecular sieve, the stainless steel wire mesh pad is in close contact with the inner wall of the adsorption tower cylinder body without gap to compensate the sinking space of the molecular sieve, an internally threaded hole is formed in the middle of the upper cover, the hydraulic compression module is installed in cooperation with the internally threaded hole through external threads, and a hydraulic compression sealing gasket is arranged on the joint surface of the two; an electric contact pressure gauge is integrated and installed at the top end of the hydraulic compression module, the detection end of the electric contact pressure gauge is in communication with the piston cavity of the hydraulic compression module, and the signal output end thereof can be externally connected with a PLC control system to realize pressure alarm and compression state feedback.

[0008] Furthermore, the hydraulic clamping module includes a main cylinder body, in which a large hydraulic cylinder is coaxially inserted and installed. A large threaded sealing sleeve is installed on the outer bottom of the main cylinder body via external threads. The upper inner surface of the large threaded sealing sleeve axially abuts against the lower end surface of the large hydraulic cylinder, fixing the large hydraulic cylinder within the main cylinder body. A large piston rod is slidably installed inside the large hydraulic cylinder. An internal threaded hole is formed at the bottom of the large piston rod, and an adjusting screw is installed in the internal threaded hole and external threads, with the lower end of the adjusting screw abutting against the center of the pressure plate. The top of the internal threaded hole of the large piston rod is provided with a limiter. A limiting structure for adjusting the installation depth of the screw is provided, the limiting structure including a first hexagonal bolt and a limiting washer; a top cap is threadedly installed at the bottom of the large threaded sealing sleeve, the inner hole of the top cap slidingly engaging with the outer wall of the large piston rod; a second hexagonal bolt is threadedly installed at the top of the large piston rod, and a large piston rod sleeve is threadedly installed at the top of the large piston rod; the first and second large piston sealing sleeves are pressed and fixed at the top of the large piston rod sleeve by the second hexagonal bolt, and the outer wall of the first large piston sealing sleeve forms a gap ≤0.05mm with the inner wall of the large cylinder. The sliding seal is achieved; a sealed piston chamber is formed at the top of the large oil cylinder, and an annular oil storage chamber is formed between the main cylinder body and the large oil cylinder; a mounting hole is vertically opened at the upper part of the main cylinder body, and a small oil cylinder is fixedly installed in the mounting hole by threads; a small piston rod is slidably installed in the small oil cylinder; a small threaded sealing sleeve is installed at the top of the small oil cylinder by threads; a lifting handle is rotatably connected to the top of the small piston rod by a pin, and the middle part of the lifting handle is rotatably connected to the support rod seat at the top of the main cylinder body by a pin, forming a force-saving lever structure; a first small piston seal is fixed to the bottom of the small piston rod by screws, and the outer wall of the first small piston seal is flush with the small oil cylinder. The inner wall is slidingly sealed; a hydraulic oil channel is provided inside the main cylinder, one end of which is connected to the oil storage chamber, and a suction check valve is provided at the connection point; the other end is connected to the bottom of the small oil cylinder; a needle valve is threadedly installed on the side wall of the main cylinder, and the valve core of the needle valve extends into the hydraulic oil channel to regulate the oil flow rate; an oil inlet check valve is provided between the oil outlet end of the hydraulic oil channel and the piston chamber, and a return oil sealing ball is provided at the valve seat of the oil inlet check valve; the side wall of the main cylinder is also provided with three interfaces, which are sealed by a first internal hexagon screw, a second internal hexagon screw, and a return oil screw, respectively, and the interface corresponding to the first internal hexagon screw is the drain port.

[0009] Furthermore, the upper outer side of the large hydraulic cylinder is provided with an annular groove, and a large sealing ring is installed in the annular groove. The outer wall of the large sealing ring is tightly fitted with the inner wall of the mounting hole of the main cylinder body. The outer side of the large threaded sealing sleeve is provided with an annular groove, and a large threaded sealing sleeve sealing ring is installed in the annular groove. The outer wall of the large threaded sealing sleeve sealing ring is tightly fitted with the end face of the internal threaded hole of the main cylinder body.

[0010] Further, the top of the adjusting screw is provided with an inner threaded hole, a first hexagonal bolt for limiting the axial displacement of the adjusting screw is fitted and mounted in the inner threaded hole, and a limiting pad with a thickness of 2-3 mm is clamped between the first hexagonal bolt and the top end face of the adjusting screw; the bottom of the inner threaded hole of the large piston rod is provided with a limiting boss, and when the limiting pad abuts against the limiting boss, the maximum extension amount of the adjusting screw is 50-80 mm.

[0011] Further, the inner hole of the top cap is provided with an annular groove, a top cap sealing ring is mounted in the annular groove, and the inner wall of the top cap sealing ring is in sliding sealing with the outer wall of the large piston rod; the inner hole of the small threaded sealing sleeve is provided with an annular groove, a second small piston sealing ring is mounted in the annular groove, and the inner wall of the second small piston sealing ring is in sliding sealing with the outer wall of the small piston rod.

[0012] Further, a cylinder flange is welded on the outer side of the adsorption tower cylinder body, an annular sealing groove is formed in the end face of the cylinder flange, a flange sealing gasket is mounted in the annular sealing groove, and the flange sealing gasket is made of oil-resistant nitrile rubber; the bolt assemblies are uniformly distributed along the circumferential direction of the cylinder flange.

[0013] Further, the bolt assembly comprises a hexagonal bolt, a flat washer, an elastic washer, and a hexagonal nut; the hexagonal bolt penetrates the bolt hole of the upper cover and the bolt hole of the cylinder flange in sequence, and after being penetrated out, the flat washer and the elastic washer are successively sleeved, and finally the hexagonal nut is tightened and fixed.

[0014] Further, the stainless steel wire mesh pad is made of 304 stainless steel and adopts a double-layer woven structure, and the resilience rate is greater than or equal to 85% when the compression amount is 5-10 mm.

[0015] Further, an oil leakage prevention storage tank is welded on the upper surface edge of the pressing plate, and the inner side wall of the oil leakage prevention storage tank is gap-fitted with the outer wall of the hydraulic pressure tightening module, so as to collect the leaked hydraulic oil of the hydraulic pressure tightening sealing pad.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The invention significantly improves the stability of the clamping force and extends the service life of the molecular sieve. Through the synergistic design of a hydraulic clamping module and an elastic stainless steel wire mesh pad, the hydraulic clamping module achieves a high initial clamping force of 12 MPa based on Pascal's law. Furthermore, the dual anti-reverse structure of the inlet check valve and the return oil sealing ball effectively suppresses the attenuation of the clamping force. After 1000 hours of operation, the attenuation is ≤0.5 MPa, far lower than traditional mechanical structures (3.2 MPa) and traditional hydraulic structures without detection (2.8 MPa). On the other hand, the elastic stainless steel wire mesh pad uses a double-layer woven structure of 304 stainless steel (80-100 mesh), with a compression rebound rate ≥85%. This automatically compensates for the empty space formed by the molecular sieve settling, preventing pulverization caused by displacement and collision. Actual operating verification shows that the molecular sieve pulverization rate of this invention is only 0.8%, and the service life is extended to ≥3 years, a 50%-100% improvement compared to traditional structures, significantly reducing the replacement cost of the molecular sieve.

[0018] This invention integrates a detection and feedback function to reduce maintenance costs and downtime. An electrical contact pressure gauge is integrated at the top of the hydraulic clamping module. Its detection end is directly connected to the piston chamber of the hydraulic clamping module, enabling real-time monitoring of clamping force changes. The signal output end can also be connected to an external PLC control system. An automatic alarm is triggered when the clamping force falls below a set threshold (e.g., 10 MPa), allowing for assessment of the molecular sieve clamping status without opening the cover. Compared to traditional structures, the maintenance frequency of this invention is reduced from "one pressurization per month + one inspection every 3-6 months" to "one pressurization every 6 months." The time for a single maintenance session is shortened from 45-90 minutes to 15 minutes, reducing downtime for maintenance by over 8 hours per year, significantly improving equipment operating efficiency and reducing labor maintenance costs.

[0019] This invention addresses the issue of hydraulic oil leakage by employing a composite protective structure of "double-layer sealing sleeve + leak-proof oil storage tank." The large and small pistons of the hydraulic clamping module utilize a double-layer sealing design with "first large piston sealing sleeve + second large piston sealing sleeve" and "first small piston sealing + second small piston sealing sleeve," respectively. Y-type and O-type large threaded sealing rings are installed between the large cylinder and the main cylinder body, and between the large threaded sealing sleeve and the main cylinder body, respectively, achieving multiple seals within the hydraulic system. Simultaneously, a 10-15mm high leak-proof oil storage tank is welded onto the pressure plate to collect any leaked hydraulic oil, controlling the annual leakage to ≤5mL and preventing oil contamination of the molecular sieve. In addition, an oil-resistant nitrile rubber flange gasket (3-5mm thick) is used between the top cover and the cylinder flange, along with a multi-layer anti-loosening structure of 8.8 grade high-strength bolt assembly, to ensure the overall sealing performance of the adsorption tower. The nitrogen purity (99.9%) fluctuates by ≤0.05% during continuous operation, which is better than the purity stability performance of traditional structures.

[0020] The hydraulic compression module of the application is detachably installed in the middle part of the upper cover through a threaded structure, the maximum extension amount of the adjusting screw rod is designed to be 50-80mm, and the molecular sieve compression needs of adsorption towers of different specifications (such as φ600-φ1000mm) can be adapted, the compression force adjusting range is wide (8-15MPa), and the application range is significantly widened compared with the single adaptability of the traditional structure, and the application range is significantly widened. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a schematic diagram of the overall structure of the application;

[0022] Fig. 2 is a schematic diagram of the structure of the hydraulic compression module of the application.

[0023] The labels shown in the drawings are: 1, molecular sieve; 2, sieve plate; 3, stainless steel wire mesh pad; 4, pressing plate; 5, cylinder flange; 6, flange sealing gasket; 7, upper cover; 8, oil leakage prevention tank; 9, hydraulic compression sealing pad; 10, electrical contact pressure gauge; 11, hydraulic compression module; 12, hexagonal nut; 13, spring washer; 14, flat washer; 15, hexagonal bolt; 16, adsorption tower cylinder; Y1, main cylinder body; Y2, large piston rod; Y3, adjusting screw rod; Y4, top hat; Y5, top hat sealing ring; Y6, large threaded sealing sleeve; Y7, large threaded sealing sleeve sealing ring; Y8, large oil cylinder; Y9, first hexagonal bolt; Y10, limiting pad; Y11, large piston rod sleeve; Y12, first large piston sealing sleeve; Y13, second hexagonal bolt; Y14, second large piston sealing sleeve; Y15, oil suction check valve; Y16, first internal hexagonal screw; Y17, sealing gasket; Y18, lifting handle; Y19, small piston rod; Y20, small threaded sealing sleeve; Y21, first small piston sealing; Y22, small oil cylinder; Y23, second small piston sealing; Y24, large sealing ring; Y25, screw; Y26, second internal hexagonal screw; Y27, oil inlet check valve; Y28, oil return sealing rubber ball; Y29, oil return screw; Y30, needle valve; Y31, hydraulic oil channel. DETAILED DESCRIPTION

[0024] The application will be further described in conjunction with the drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the application and not to limit the scope of the application. In addition, it should be understood that after reading the content taught by the application, those skilled in the art can make various modifications or modifications to the application, and these equivalent forms also fall within the scope defined by the application.

[0025] The application will be further described in conjunction with the drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the application and not to limit the scope of the application. In addition, it should be understood that after reading the content taught by the application, those skilled in the art can make various modifications or modifications to the application, and these equivalent forms also fall within the scope defined by the application. Figs. 1-2The utility model provides a kind of hydraulic pressure compacting adsorption tower structure with detection feedback function, including adsorption tower cylinder body 16, upper cover 7, hydraulic pressure compacting module, the upper cover 7 is detachably fixed at adsorption tower cylinder body 16 top end by bolt assembly, the adsorption tower cylinder body 16 is filled with granular molecular sieve 1, sieve plate 2, stainless steel wire mesh pad 3 and pressing plate 4 are sequentially stacked in the upper of molecular sieve 1 along the axis, and the stainless steel wire mesh pad 3 and adsorption tower cylinder body 16 inner wall are gapless and are attached to compensate molecular sieve 1 subsidence space;Threaded hole is set in the middle of the upper cover 7, the hydraulic pressure compacting module 11 is installed by outer thread and threaded hole cooperation, and the joint surface of both is equipped with hydraulic pressure compacting sealing washer 9;Electric contact pressure gauge 10 is integrally installed at the top of the hydraulic pressure compacting module 11, the detection end of the electric contact pressure gauge 10 is communicated with the piston cavity of the hydraulic pressure compacting module 11, and the signal output end thereof can be externally connected PLC control system to realize pressure alarm and compacting state feedback.

[0026] The hydraulic pressure compacting module 11 includes a main cylinder body Y1, a large oil cylinder Y8 is coaxially inserted and installed in the main cylinder body Y1, a large threaded sealing sleeve Y6 is installed on the outside of the bottom of the main cylinder body Y1 through external threads, the inside upper end surface of the large threaded sealing sleeve Y6 axially abuts against the lower end surface of the large oil cylinder Y8, fixing the large oil cylinder Y8 in the main cylinder body Y1, a large piston rod Y2 is slidably fitted in the large oil cylinder Y8, an inner threaded hole is formed in the bottom of the large piston rod Y2, an adjusting screw Y3 is installed in the inner threaded hole through external threads, and the lower end of the adjusting screw Y3 abuts against the center of the pressing plate 4, a limiting structure is arranged on the top of the inner threaded hole of the large piston rod Y2 for limiting the installation depth of the adjusting screw Y3, the limiting structure includes a first hexagonal bolt Y9 and a limiting pad Y10, a top hat Y4 is installed on the bottom of the large threaded sealing sleeve Y6 through threads, the inner hole of the top hat Y4 is slidably fitted with the outer wall of the large piston rod Y2, a second hexagonal bolt Y13 is installed on the top of the large piston rod Y2 through threaded structure, a large piston rod sleeve Y11 is installed on the top of the large piston rod Y2 through threaded structure, the top of the large piston rod sleeve Y11 is tightly fixed with a first large piston sealing sleeve Y12 and a second large piston sealing sleeve Y14 through the second hexagonal bolt Y13, and the outer wall of the first large piston sealing sleeve Y12 forms a sliding seal with the inner wall of the large oil cylinder Y8 with a gap of ≤0.05mm, a closed piston cavity is formed on the top of the large oil cylinder Y8, an annular oil storage cavity is formed between the main cylinder body Y1 and the large oil cylinder Y8,

[0027] The main cylinder body Y1 upper part is vertically provided with a mounting hole, a small oil cylinder Y22 is fixedly installed in the mounting hole through screw thread, a small piston rod Y19 is slidingly and tightly installed in the small oil cylinder Y22, a small threaded sealing sleeve Y20 is installed on the top of the small oil cylinder Y22 through screw thread, the small piston rod Y19 top is rotatably connected with a handle Y18 through a pin shaft, the handle Y18 is rotatably connected with a support rod seat on the top of the main cylinder body Y1 through a pin shaft, forming a labor-saving lever structure; the small piston rod Y19 bottom is fixedly provided with a first small piston sealing Y21 through a screw Y25, and the outer wall of the first small piston sealing Y21 is slidingly sealed with the inner wall of the small oil cylinder Y22.

[0028] The main cylinder body Y1 is internally provided with a hydraulic oil passage Y31, one end of the hydraulic oil passage Y31 is communicated with an oil storage cavity, a suction one-way valve Y15 is arranged at the communication position, and the other end is communicated with the bottom of the small oil cylinder Y22; the small piston rod Y19 bottom is slidingly connected in the small oil cylinder Y22 through the first small piston sealing Y21 and realizes sealing at the connection position.

[0029] The side wall of the main cylinder body Y1 is provided with a needle valve Y30 through screw thread, the valve core of the needle valve Y30 extends into the hydraulic oil passage Y31 to adjust the oil flow rate; an oil inlet one-way valve Y27 is arranged between the oil outlet end of the hydraulic oil passage Y31 and the piston cavity, and a back sealing rubber ball Y28 is arranged at the valve seat of the oil inlet one-way valve Y27; the side wall of the main cylinder body Y1 is further provided with three interfaces, which are sealed by a first inner hexagonal screw Y16, a second inner hexagonal screw Y26 and a back oil screw Y29, and the interface corresponding to the first inner hexagonal screw Y16 is a drain port.

[0030] The outer side of the upper end of the large oil cylinder Y8 is provided with an annular groove, the annular groove is installed with a large sealing ring Y24, and the outer wall of the large sealing ring Y24 is tightly combined with the inner wall of the mounting hole of the main cylinder body Y1; the outer side of the large threaded sealing sleeve Y6 is provided with an annular groove, the annular groove is installed with a large threaded sealing sleeve sealing ring Y7, and the outer wall of the large threaded sealing sleeve sealing ring Y7 is tightly combined with the end face of the internal thread hole of the main cylinder body Y1.

[0031] The top of the adjusting screw Y3 is provided with an internal thread hole, the first hexagonal bolt Y9 for limiting the axial displacement of the adjusting screw Y3 is adaptively installed in the internal thread hole, and the thickness of the limiting pad Y10 between the first hexagonal bolt Y9 and the top end face of the adjusting screw Y3 is 2-3mm; the bottom of the internal thread hole of the large piston rod Y2 is provided with a limiting boss, when the limiting pad Y10 abuts against the limiting boss, the maximum extension amount of the adjusting screw Y3 is 50-80mm. The limiting boss has the installation limiting effect of the adjusting screw Y3 in the large piston rod Y2, which can limit the installation depth, when the maximum installation depth is reached, the adjusting screw Y3 abuts the limiting pad Y10 against the limiting boss.

[0032] The inner hole of the top cap Y4 is provided with an annular groove, and a top cap sealing ring Y5 is mounted in the annular groove, and the inner wall of the top cap sealing ring Y5 is in sliding sealing with the outer wall of the large piston rod Y2; the inner hole of the small threaded sealing sleeve Y20 is provided with an annular groove, and a second small piston sealing Y23 is mounted in the annular groove, and the inner wall of the second small piston sealing Y23 is in sliding sealing with the outer wall of the small piston rod Y19. After the top cap Y4 is locked in the large threaded sealing sleeve Y6 by rotating, the inner side of the top cap sealing ring Y5 is in sliding contact with the large piston rod Y2, and cooperates with the sealing structure in the large threaded sealing sleeve Y6 to realize the sealing function of the lower end of the large oil cylinder Y8.

[0033] The outer side of the adsorption tower cylinder body 16 is welded with a cylinder flange 5, the end face of the cylinder flange 5 is provided with an annular sealing groove, the annular sealing groove is mounted with a flange sealing gasket 6, and the flange sealing gasket 6 is made of oil-resistant butadiene-acrylonitrile rubber; the bolt assembly is uniformly distributed along the circumferential direction of the cylinder flange 5.

[0034] The bolt assembly includes a hexagonal bolt 15, a flat washer 14, an elastic washer 13, and a hexagonal nut 12; the hexagonal bolt 15 penetrates the bolt hole of the upper cover 7 and the bolt hole of the cylinder flange 5 in sequence, and is then sleeved with the flat washer 14 and the elastic washer 13 in sequence, and finally is screwed and fixed with the hexagonal nut 12.

[0035] The stainless steel wire mesh pad 3 is made of 304 stainless steel and has a double-layer woven structure, and the resilience rate of the stainless steel wire mesh pad 3 is greater than or equal to 85% when the compression amount is 5-10 mm; the stainless steel wire mesh pad 3 is tightly connected with the inner wall of the adsorption tower cylinder body 16 without leaving gaps.

[0036] The upper surface edge of the pressing plate 4 is welded with an oil leakage prevention storage tank 8, and the inner side wall of the oil leakage prevention storage tank 8 is gap-fitted with the outer wall of the hydraulic pressing module 11, so as to collect the leaked hydraulic oil of the hydraulic pressing sealing pad 9.

[0037] When the bottom surface of the first large piston sealing sleeve Y12 is in contact with the large threaded sealing sleeve Y6, the bottom surface of the first large piston sealing sleeve Y12 is clamped in the inner groove surface of the large threaded sealing sleeve Y6, and at this time, the large piston rod Y2 has a limiting function.

[0038] The handle Y18 of the hydraulic compression module 11 is inserted into the matched short rod and lifted upward, and the small piston rod Y19 is driven to move upward in the small oil cylinder Y22 under the action of the lever force. At this time, the oil inlet one-way valve Y27 is closed to prevent the hydraulic oil in the hydraulic oil passage Y31 from flowing back to the inside of the small piston. At the same time, the oil suction one-way valve Y15 is opened, and the hydraulic oil is pumped into the inside of the small piston from the oil storage cavity (the cavity formed between the main cylinder body and the large oil cylinder). The handle Y18 of the hydraulic compression module 11 is inserted into the matched short rod and pressed downward, and the small piston rod Y19 is driven to move downward in the small oil cylinder Y22 under the action of the lever force. At this time, the oil suction one-way valve Y15 is closed, and the oil inlet one-way valve Y27 is opened. The hydraulic oil is pumped into the piston cavity in the large oil cylinder Y8 from the small oil cylinder Y22 under the pushing force of the small piston rod Y19, and the large piston rod Y2 and the connected adjusting screw Y3 are extended and move downward under the action of the hydraulic pressure. Under the pressure of the adjusting screw Y3, the pressing plate 4 moves downward, the stainless steel wire mesh pad 3 is compressed again, and the molecular sieve 1 is compressed again.

[0039] The handle Y18 is repeatedly moved upward and downward, and the molecular sieve 1 is repeatedly compressed. The reading of the electric contact pressure gauge 10 is observed, and the compression is stopped when a certain pressure is reached; the electric contact pressure gauge 10 has a remote transmission function (which can be realized by various existing technologies such as Zigbee, Wfi, etc.), and can directly display and connect the PLC end signal through pressure monitoring. Without opening the cover, the compression state of the molecular sieve 1 can be known, so as to realize alarm and manual compression again.

[0040] When the oil return screw Y29 is tightened, the oil return sealing rubber ball Y28 is squeezed and sealed with the main cylinder body Y1; when the oil return screw Y29 is loosened, the oil return sealing rubber ball Y28 communicates with the main cylinder body Y1, and at this time the hydraulic oil flows back from the piston cavity to the oil storage cavity, and the large piston rod Y2 and the adjusting screw Y3 retract.

[0041] Hydraulic pressure has the characteristics of stable transmission, large carrying capacity, sensitive system and high reliability, and the following principles are applied:

[0042] 1. Pascal's law. The pressure of the liquid at each place is consistent, that is, in a balanced system, the pressure exerted on a smaller piston is smaller, and the pressure exerted on a larger piston is larger, so that the liquid can remain stationary. Through the transmission of the liquid, different pressures can be obtained on different ends to achieve the purpose of force transmission.

[0043] 2. Lever principle. The handle lever of the hydraulic compression module and the handle lever jointly act, the torque applied at the handle lever generates a counter torque at the main lever, so that the main lever has an upward torque, thereby realizing the lifting of the object.

[0044] 3. Hydraulic transmission. The liquid of the hydraulic pressure compacting module is pressed into the cylinder, increasing the internal pressure of the cylinder, so that the piston moves upward under pressure, and then lifts the object. Due to the nature of the liquid, the pressure generated by the liquid in the cylinder is uniformly distributed, so the jack has good stability when lifting.

[0045] Comparative example:

[0046]

[0047] According to the above specific implementation condition data comparison table, under the same adsorption tower specification (φ800x2500mm, molecular sieve filling amount 1.2m 3 ) and food industry nitrogen production conditions (inlet pressure 0.8MPa, adsorption cycle 120s, ambient temperature 5-40℃), the hydraulic pressure compacting adsorption tower structure with detection feedback function of the present application shows significant performance advantages and application value compared with the traditional mechanical compacting structure and the traditional non-detection hydraulic structure. In the core performance dimension, the initial compacting force of the present application is 12MPa and the attenuation after 1000h is only ≤0.5MPa, which is much better than the attenuation level of 3.2MPa of the traditional mechanical structure and 2.8MPa of the traditional non-detection hydraulic structure, effectively inhibiting the displacement collision of molecular sieve due to insufficient compacting force, reducing the pulverization rate of molecular sieve to 0.8% and prolonging the service life to ≥3 years, which is a significant optimization compared with the traditional mechanical structure (pulverization rate 5.2%, service life 1.5 years) and the traditional non-detection hydraulic structure (pulverization rate 3.5%, service life 2 years); In the operation and maintenance efficiency dimension, the present application relies on the real-time feedback function of the electric contact pressure gauge to complete the state monitoring without opening the cover, only needs to be repressured every 6 months and the single maintenance time is only 15min, which significantly reduces the operation and maintenance cost and downtime compared with the traditional mechanical structure which needs to be repressured every month and opened for inspection every 3 months (single maintenance time 90min), and the traditional non-detection hydraulic structure which needs to be repressured every 2 months and opened for inspection every 6 months (single maintenance time 45min); In the environmental protection and stability dimension, the present application controls the annual hydraulic oil leakage to ≤5mL through the design of the oil leakage prevention tank, avoiding the pollution of 80mL leakage of the traditional non-detection hydraulic structure to the molecular sieve, and at the same time ensuring the continuous operation of the pressure swing adsorption nitrogen production purity (99.9%) with a fluctuation of ≤0.05%, which is better than the purity stability performance of the two types of traditional structures. In summary, through the integrated design of "detection feedback - hydraulic pressure compacting - leakage compensation", the present application solves the problems of fast compacting force attenuation, molecular sieve failure and complicated operation and maintenance of the traditional adsorption tower structure, and provides reliable structural support for the efficient and stable operation of the pressure swing adsorption equipment.

[0048] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulically pressed adsorption tower structure with detection feedback function, comprising an adsorption tower body (16), a top cover (7), and a hydraulic pressing module, characterized in that: The top cover (7) is detachably fixed to the top of the adsorption tower body (16) by bolt assembly. The adsorption tower body (16) is filled with granular molecular sieve (1). A sieve plate (2), a stainless steel wire mesh pad (3) and a pressure plate (4) are stacked axially above the molecular sieve (1). The stainless steel wire mesh pad (3) fits the inner wall of the adsorption tower body (16) without gap to compensate for the sinking space of the molecular sieve (1). An internal thread hole is opened in the middle of the top cover (7). The hydraulic clamping module (11) is installed by the external thread and the internal thread hole, and a hydraulic clamping sealing gasket (9) is provided on the mating surface of the two. An electric contact pressure gauge (10) is integrated at the top of the hydraulic clamping module (11). The detection end of the electric contact pressure gauge (10) is connected to the piston chamber of the hydraulic clamping module (11), and its signal output end can be connected to a PLC. The control system realizes pressure alarm and clamping status feedback. The hydraulic clamping module (11) includes a main cylinder body (Y1). A large oil cylinder (Y8) is coaxially inserted into the main cylinder body (Y1). A large threaded sealing sleeve (Y6) is installed on the outer side of the bottom of the main cylinder body (Y1) through external threads. The upper inner end face of the large threaded sealing sleeve (Y6) abuts axially with the lower end face of the large oil cylinder (Y8) to fix the large oil cylinder (Y8) in the main cylinder body (Y1). A large piston rod (Y2) is slidably installed in the large oil cylinder (Y8). An internal threaded hole is opened at the bottom of the large piston rod (Y2). An adjusting screw (Y3) is installed in the internal threaded hole and the external thread, and the lower end of the adjusting screw (Y3) abuts with the center of the pressure plate (4). The top of the internal threaded hole of the large piston rod (Y2) is provided with A limiting structure is provided to limit the installation depth of the adjusting screw (Y3). The limiting structure includes a first hexagonal bolt (Y9) and a limiting washer (Y10). A top cap (Y4) is threadedly installed at the bottom of the large threaded sealing sleeve (Y6), and the inner hole of the top cap (Y4) slides in fit with the outer wall of the large piston rod (Y2). A second hexagonal bolt (Y13) is threadedly installed at the top of the large piston rod (Y2), and a large piston rod sleeve (Y11) is threadedly installed at the top of the large piston rod (Y2). The first large piston sealing sleeve (Y12) and the second large piston sealing sleeve (Y14) are pressed and fixed at the top of the large piston rod sleeve (Y11) by the second hexagonal bolt (Y13), and the outer wall of the first large piston sealing sleeve (Y12) forms a gap ≤0 with the inner wall of the large oil cylinder (Y8).A 0.05mm sliding seal is provided; a sealed piston chamber is formed at the top of the large oil cylinder (Y8), and an annular oil storage chamber is formed between the main cylinder body (Y1) and the large oil cylinder (Y8); a mounting hole is vertically opened at the upper part of the main cylinder body (Y1), and a small oil cylinder (Y22) is fixedly installed in the mounting hole by threads. A small piston rod (Y19) is slidably installed in the small oil cylinder (Y22), and a small threaded sealing sleeve (Y20) is installed at the top of the small oil cylinder (Y22) by threads. A lifting handle (Y18) is rotatably connected to the top of the small piston rod (Y19) by a pin, and the middle part of the lifting handle (Y18) is rotatably connected to the support rod seat at the top of the main cylinder body (Y1) by a pin, forming a force-saving lever structure; a first small piston seal (Y21) is fixed to the bottom of the small piston rod (Y19) by screws (Y25), and the outer wall of the first small piston seal (Y21) is flush with the inner wall of the small oil cylinder (Y22). The main cylinder (Y1) features a sliding seal. A hydraulic oil passage (Y31) is internally located within the main cylinder (Y1). One end of the hydraulic oil passage (Y31) connects to an oil reservoir, where a suction check valve (Y15) is installed. The other end connects to the bottom of a small cylinder (Y22). A needle valve (Y30) is threaded onto the side wall of the main cylinder (Y1). The valve core of the needle valve (Y30) extends into the hydraulic oil passage (Y31) to regulate the oil flow rate. An inlet check valve (Y27) is installed between the oil outlet of the hydraulic oil passage (Y31) and the piston chamber. A return oil sealing ball (Y28) is located at the valve seat of the inlet check valve (Y27). The side wall of the main cylinder (Y1) also has three interfaces, sealed by a first hexagonal socket screw (Y16), a second hexagonal socket screw (Y26), and a return oil screw (Y29), respectively. The interface corresponding to the first hexagonal socket screw (Y16) is the drain port.

2. The hydraulic compression adsorption tower structure with detection feedback function according to claim 1, characterized in that: The upper outer side of the large hydraulic cylinder (Y8) is provided with an annular groove, and a large sealing ring (Y24) is installed in the annular groove. The outer wall of the large sealing ring (Y24) is tightly fitted with the inner wall of the mounting hole of the main cylinder body (Y1). The outer side of the large threaded sealing sleeve (Y6) is provided with an annular groove, and a large threaded sealing sleeve sealing ring (Y7) is installed in the annular groove. The outer wall of the large threaded sealing sleeve sealing ring (Y7) is tightly fitted with the end face of the internal threaded hole of the main cylinder body (Y1).

3. The hydraulic compression adsorption tower structure with detection feedback function according to claim 1, characterized in that: The top of the adjusting screw (Y3) has an internal threaded hole, in which a first hexagonal bolt (Y9) for limiting the axial displacement of the adjusting screw (Y3) is fitted. A limiting washer (Y10) with a thickness of 2-3mm is sandwiched between the first hexagonal bolt (Y9) and the top surface of the adjusting screw (Y3). The bottom of the internal threaded hole of the large piston rod (Y2) is provided with a limiting boss. When the limiting washer (Y10) abuts against the limiting boss, the maximum extension of the adjusting screw (Y3) is 50-80mm.

4. The hydraulic compression adsorption tower structure with detection feedback function according to claim 1, characterized in that: The inner hole of the top cap (Y4) is provided with an annular groove, and a top cap sealing ring (Y5) is installed in the annular groove. The inner wall of the top cap sealing ring (Y5) slides and seals with the outer wall of the large piston rod (Y2). The inner hole of the small threaded sealing sleeve (Y20) is provided with an annular groove, and a second small piston seal (Y23) is installed in the annular groove. The inner wall of the second small piston seal (Y23) slides and seals with the outer wall of the small piston rod (Y19).

5. The hydraulic compression adsorption tower structure with detection feedback function according to claim 1, characterized in that: The upper part of the outer side of the adsorption tower body (16) is welded with a cylinder flange (5). An annular sealing groove is opened on the end face of the cylinder flange (5). A flange sealing gasket (6) is installed in the annular sealing groove. The flange sealing gasket (6) is made of oil-resistant nitrile rubber. The bolt assembly is evenly distributed along the circumference of the cylinder flange (5).

6. The hydraulic compression adsorption tower structure with detection feedback function according to claim 5, characterized in that: The bolt assembly includes a hexagonal bolt (15), a flat washer (14), a spring washer (13), and a hexagonal nut (12). The hexagonal bolt (15) passes through the bolt hole of the upper cover (7) and the bolt hole of the cylinder flange (5) in sequence. After passing through, the flat washer (14) and the spring washer (13) are installed in sequence, and finally the hexagonal nut (12) is tightened and fixed.

7. The hydraulic compression adsorption tower structure with detection feedback function according to claim 1, characterized in that: The stainless steel wire mesh pad (3) is made of 304 stainless steel and adopts a double-layer woven structure. Its springback rate is ≥85% when the compression is 5-10mm.

8. The hydraulic compression adsorption tower structure with detection feedback function according to claim 1, characterized in that: The upper surface edge of the pressure plate (4) is welded with an oil-proof storage tank (8). The inner wall of the oil-proof storage tank (8) is fitted with the outer wall of the hydraulic pressing module (11) with a gap, which can collect the hydraulic oil leaking from the hydraulic pressing sealing gasket (9).

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