Hydraulic diaphragm pump device and method for pumping a liquid with a diaphragm pump

Abstract

This invention relates to a hydraulic diaphragm pump device and a diaphragm pumping method, belonging to the technical field of diaphragm pump conveying equipment. The device includes an oil reservoir, a reciprocating transmission mechanism, a pressure relief assembly, a hydraulic power conversion assembly, an inlet / outlet assembly, and a diaphragm medium conveying assembly. The method includes obtaining a reference reciprocating pushing frequency and performing a reciprocating pushing operation; obtaining a discharge rate; obtaining a discharge rate deviation value based on the discharge rate and an effective discharge rate threshold; obtaining the current reciprocating pushing frequency and performing a corrective reciprocating pushing operation; acquiring the internal pressure of a first hydraulic chamber; determining the pressure increment of the first hydraulic chamber; when the pressure increment of the first hydraulic chamber exceeds the normal increment range, outputting a material blockage signal and performing a material blockage clearing operation; and when the internal pressure of the first hydraulic chamber exceeds the first hydraulic chamber safety pressure threshold, outputting a conduction pressure relief signal. This invention improves the integration of the cavity space and optimizes the coupling of the hydraulic cavity.

Description

Technical Field

[0001] This invention relates to the field of diaphragm pump conveying equipment technology, and in particular to a hydraulic diaphragm pump device and a diaphragm pumping method for conveying liquid. Background Technology

[0002] Hydraulic diaphragm pumps are leak-free volumetric conveying equipment widely used in chemical, environmental protection, and precision processing fields. They can convey special media with high viscosity, strong corrosiveness, and solid particles. They rely on hydraulic oil to drive the flexible diaphragm to reciprocate, isolating the hydraulic oil from the material to be conveyed. This can prevent the conveyed medium from contaminating the hydraulic drive system and prevent material leakage. It is a mainstream conveying equipment with the advantages of safe and isolated conveying.

[0003] The working principle of a conventional hydraulic diaphragm pump is that the power mechanism drives the transmission push rod to reciprocate linearly. The push rod squeezes the hydraulic medium inside the hydraulic chamber to form pressure, which is transmitted to the isolation diaphragm. The diaphragm deforms and compresses the material chamber. Under the action of pressure, the material in the chamber pushes open the discharge check valve to complete the discharge. When the push rod returns, the hydraulic chamber forms a negative pressure, the diaphragm rebounds, and the negative pressure in the material chamber draws in the material, completing the suction action. This cycle is used to achieve continuous transport of the medium.

[0004] Regarding the aforementioned technologies, existing hydraulic diaphragm pumps cannot form a coordinated dual hydraulic chamber and material conveying chamber by relying on a single sliding transmission push rod integrated within the main chamber of the same hydraulic cylinder. The hydraulic chambers corresponding to oil replenishment and pressure relief need to be arranged separately externally, resulting in poor spatial coupling of the chambers. Summary of the Invention

[0005] To address the technical problem of low overall integration caused by the separate arrangement of the cavity in existing hydraulic diaphragm pumps, this invention provides a hydraulic diaphragm pump device and a diaphragm pumping method.

[0006] In a first aspect, the present invention provides a hydraulic diaphragm pump device, which adopts the following technical solution: A hydraulic diaphragm pump device includes an oil reservoir housing, a reciprocating transmission mechanism, a hydraulic power conversion component, a diaphragm medium conveying component, a pressure relief component, and an inlet / outlet liquid component. The hydraulic power conversion assembly includes a hydraulic cylinder body and a transmission push rod. The hydraulic cylinder body is located inside an oil reservoir housing and has a main chamber. The transmission push rod is slidably and sealed within the main chamber. The diaphragm medium conveying assembly includes an isolation diaphragm, a feed check valve disposed within the hydraulic cylinder, and a discharge check valve disposed within the hydraulic cylinder. The isolation diaphragm is disposed within the main chamber. The hydraulic cylinder has a first material conveying chamber and a second material conveying chamber. One end of the first material conveying chamber is connected to the feed check valve, and the end of the first material conveying chamber away from the feed check valve is connected to the isolation diaphragm. One end of the second material conveying chamber is connected to the discharge check valve, and the end of the second material conveying chamber away from the discharge check valve is connected to the isolation diaphragm. The end of the feed check valve away from the first material conveying chamber is connected to a feed inlet, and the end of the discharge check valve away from the second material conveying chamber is connected to a discharge outlet. The transmission push rod divides the main chamber into two independent hydraulic chambers, a first hydraulic chamber and a second hydraulic chamber. The isolation diaphragm is fixedly connected to the end of the transmission push rod near the first material conveying chamber. The reciprocating transmission mechanism is mounted on the oil storage shell. The reciprocating transmission mechanism includes a transmission driving end and a transmission driven end, and the transmission driven end extends into the first hydraulic chamber. The pressure relief assembly is located on the hydraulic cylinder body and communicates with the first hydraulic chamber, while the inlet / outlet fluid assembly is located on the hydraulic cylinder body and communicates with the second hydraulic chamber.

[0007] By adopting the above technical solution, the transmission push rod slides in the main chamber, directly dividing the main chamber into two independent and sealed first hydraulic chambers and second hydraulic chambers. At the same time, the first material conveying chamber, the second material conveying chamber, and the corresponding inlet and outlet check valves are directly integrated inside the hydraulic cylinder. Relying on the connection and cooperation between the transmission push rod and the isolation diaphragm, the hydraulic power, diaphragm deformation, and material conveying are integrated into the entire chamber. There is no need for additional external separate hydraulic chambers for oil replenishment and pressure relief, which improves the spatial coupling of the chambers, reduces the space occupied by the whole machine, and effectively improves the overall integration of the hydraulic diaphragm pump.

[0008] Optionally, the oil storage shell contains a lubricating medium, and the oil storage shell completely covers the drive end, so as to achieve uninterrupted lubrication by continuously wetting the drive end with the lubricating medium. The transmission push rod is provided with a throttling oil replenishment hole, and the hydraulic working medium inside the second hydraulic chamber can be replenished to the first hydraulic chamber through the throttling oil replenishment hole.

[0009] By adopting the above technical solution, the lubricating medium can be contained in the oil storage shell, and the transmission drive end of the reciprocating transmission mechanism can be continuously lubricated without the need for an external lubrication oil circuit, which further simplifies the overall structure. At the same time, the throttling oil replenishment hole can realize automatic micro-oil replenishment from the second hydraulic chamber to the first hydraulic chamber, compensating for the micro-hydraulic medium loss during the normal operation of the first hydraulic chamber, reducing the need for an external oil replenishment mechanism, and further improving the integration of the device.

[0010] Optionally, the liquid inlet / outlet assembly includes an inlet valve and an outlet valve; The inlet valve is used to introduce hydraulic working medium into the second hydraulic chamber, and the outlet valve is used to discharge hydraulic working medium from the second hydraulic chamber.

[0011] By adopting the above technical solution, the initial pressure inside the second hydraulic chamber can be adjusted by the inlet valve and the outlet valve. The pressure level of the second hydraulic chamber can also be adjusted according to the actual working conditions during the reciprocating motion of the transmission push rod, providing a stable pressure base for pressure compensation of the first hydraulic chamber, thereby adapting to different conveying media and different conveying power.

[0012] Optionally, the reciprocating transmission mechanism, hydraulic power conversion component, inlet / outlet liquid component, and diaphragm medium conveying component constitute a liquid separation and conveying component; The liquid separation and delivery components are of a certain number, and the liquid separation and delivery components share the same pressure relief component. The pressure relief component includes a pressure stabilizing check valve corresponding to the number of liquid separation and delivery components, and a pressure relief valve connected to the pressure stabilizing check valve. The pressure stabilizing check valve is connected to the first hydraulic chamber of each liquid separation and delivery component and is used to release the hydraulic medium when the internal pressure of the first hydraulic chamber corresponding to any first hydraulic chamber exceeds the safety pressure threshold of the first hydraulic chamber.

[0013] By adopting the above technical solution, multiple liquid separation conveying components can work together to complete material conveying operations at multiple stations and in multiple pipelines. By sharing the same pressure relief component, there is no need to configure a separate pressure relief structure for each liquid separation conveying component, which further reduces the redundancy of pressure relief components. While ensuring that each conveying unit has independent pressure relief capability, the number of components and manufacturing cost of the whole machine are reduced, and it is also convenient to carry out unified pressure relief control and maintenance.

[0014] Secondly, the present invention provides a diaphragm pumping liquid method, which adopts the following technical solution: A diaphragm pumping method, applied to a hydraulic diaphragm pump device as described above, includes: Step S1: In response to the liquid inlet signal, obtain the preset reference reciprocating push frequency, and control the reciprocating transmission mechanism to perform reciprocating push operation according to the reference reciprocating push frequency; Step S2: Obtain the discharge rate corresponding to the discharge check valve in real time; Step S3: Obtain the discharge rate deviation value based on the discharge rate and the preset effective discharge rate threshold; Step S4: Obtain the current reciprocating push frequency, and perform a corrected reciprocating push operation based on the discharge rate deviation value and the baseline reciprocating push frequency; Step S5: During the reciprocating push operation, the internal pressure of the first hydraulic chamber is collected in real time; Step S6: Determine the pressure increment of the first hydraulic chamber based on the internal pressure of the first hydraulic chamber; Step S7: When the pressure increment inside the first hydraulic chamber exceeds the preset normal increment range, output a material blockage signal and perform a material blockage clearing operation; Step S8: When the internal pressure of the first hydraulic chamber exceeds the safe pressure threshold of the first hydraulic chamber, output a pressure relief signal.

[0015] By adopting the above technical solution, the discharge rate and the effective discharge rate threshold are compared in real time, which can promptly identify the problem of poor discharge caused by blockage. The blockage status is further confirmed by combining the pressure change of the first hydraulic chamber. When the blockage is confirmed, the sorting operation is automatically started. When the pressure exceeds the safety threshold, the pressure is promptly released to ensure the safe operation of the equipment. There is no need for manual inspection to check for blockage, which improves the automation and safety of the equipment operation.

[0016] Optionally, methods for performing corrective reciprocating push operations based on the discharge rate deviation and the baseline reciprocating push frequency include: Step S40: When the discharge rate deviation value is negative, obtain the current internal pressure of the first hydraulic chamber; Step S41: If the pressure inside the first hydraulic chamber falls within the preset effective pressure deficiency range, determine the hydraulic deficiency component number and output a fluid replenishment signal based on the hydraulic deficiency component number; Step S42: If the current internal pressure of the first hydraulic chamber does not fall within the effective pressure insufficient range, determine the incremental reciprocating push frequency queue based on the discharge rate deviation value, and perform the corrective reciprocating push operation based on the incremental reciprocating push frequency queue. Step S43: Real-time acquisition and correction of the internal pressure of the first hydraulic chamber; Step S44: If the internal pressure of the first hydraulic chamber falls within the preset effective pressure risk range, determine the excess hydraulic chamber number and output a pressure relief signal based on the excess hydraulic chamber number; Step S45: During the execution of the correction reciprocating push operation, the current discharge rate deviation value is obtained in real time. If the current discharge rate deviation value is not negative, the correction reciprocating push operation is stopped.

[0017] By adopting the above technical solution, when the discharge rate is negative and the pressure is insufficient, the liquid shortage component can be directly located and a liquid replenishment signal can be sent to replenish the hydraulic working medium in time. If the pressure is normal, the pushing frequency is gradually increased to improve the discharge rate. During the adjustment process, the hydraulic pressure is monitored in real time. When the pressure enters the risk range, the pressure is released in time to ensure safety. When the discharge rate returns to normal, the correction operation can be stopped, so that the discharge rate can be stably maintained within the effective range, improving the adaptive adjustment capability of the conveying condition.

[0018] Optionally, methods for performing material blockage clearing operations include: Step S60: Obtain the current push frequency; Step S61: Determine the decreasing push frequency curve based on the current repeat push frequency; Step S62: Perform push frequency reduction operation based on the decreasing push frequency curve; Step S63: During the push frequency reduction operation, determine the current pressure increment of the first hydraulic chamber in real time based on the internal pressure of the first hydraulic chamber; Step S64: When there is no pressure increment inside the first hydraulic chamber, stop the push frequency reduction operation; Step S65: When there is an increasing pressure inside the first hydraulic chamber, perform a pressure relief operation.

[0019] By adopting the above technical solution, gradually reducing the pushing frequency can reduce the diaphragm extrusion rate, preventing the blockage location from being further tightened by high pressure. At the same time, with the gradual depressurization operation, the blockage material is loosened and displaced by the diaphragm rebound under low pressure, thus relieving the blockage. When the pressure increment disappears, it means that the blockage has been relieved, and the combing operation can be stopped to ensure that the equipment resumes normal conveying operation.

[0020] Optionally, methods for performing the pressure relief operation include: Step S650: Obtain the current liquid separation and conveying component number, and determine the current pressure-stabilizing check valve number based on the current liquid separation and conveying component number; Step S651: Perform a pressure relief operation based on the current pressure-regulating check valve number; Step S652: During the pressure relief operation, the pressure increment of the conducting hydraulic chamber is determined in real time based on the internal pressure of the first hydraulic chamber; Step S653: Accumulate the number of consecutive increases in the conduction pressure based on the increment value of the internal pressure of the conduction hydraulic chamber; Step S654: When the number of consecutive increases in conduction pressure exceeds the preset effective blockage number threshold, output a complete blockage signal; Step S655: Stop performing the conduction pressure relief operation when there is no longer a continuous increase in the conduction pressure.

[0021] By adopting the above technical solution, the target liquid separation and conveying component that has become blocked can be depressurized separately, which can avoid affecting the conveying operation of other normally functioning components. The number of pressure increases during the continuous depressurization process can be counted to determine whether the blockage can be resolved on its own. When the number of increases exceeds the threshold, a signal is output to remind the staff to clean it manually. This eliminates the need for manual inspection, improves the efficiency of blockage fault handling, and reduces manual maintenance costs.

[0022] Optional, also includes: Step S6550: During the pressure relief operation, determine the number of the unrelieved liquid separation and delivery component based on the current pressure-stabilizing check valve number; Step S6551: Obtain the position of the reciprocating transmission mechanism corresponding to the number of the undepressurized liquid separation and conveying component in real time; Step S6552: When the reciprocating transmission mechanism is at the preset reciprocating transmission bottom position, determine the pressure at the bottom of the unrelieved hydraulic chamber in real time; Step S6553: Determine the pressure increment at the bottom of the unrelieved hydraulic chamber based on the pressure at the bottom of the unrelieved hydraulic chamber; Step S6554: When the pressure increment at the bottom of the unrelieved hydraulic chamber falls within the preset abnormal increment range, determine the number to be verified; Step S6555: Obtain the fluid replenishment signal corresponding to the number to be verified; Step S6556: When there is no liquid replenishment signal, determine the abnormal pressure stabilizing check valve number based on the number to be verified, and output the corresponding liquid discharge signal based on the abnormal pressure stabilizing check valve number.

[0023] By adopting the above technical solution, during the process of depressurizing and clearing blockages in a single component, the pressure at the bottom of the hydraulic chamber of the remaining undepressurized components can be detected simultaneously. This allows for timely detection of abnormal depressurization or media leakage in the undepressurized components. In the absence of a fluid replenishment signal, the abnormal pressure-stabilizing check valve can be identified and a corresponding signal can be output to remind maintenance and control the opening of the outlet valve. This prevents a sudden increase in hydraulic pressure that cannot be discharged in a short period of time, thereby improving the equipment's fault self-diagnosis capability.

[0024] Optionally, it also includes a method for determining the abnormal pressure-stabilizing check valve number when there is no pressure increment at the bottom of the unrelieved hydraulic chamber, the method comprising: Step S6557: When there is no pressure increment at the bottom of the unrelieved hydraulic chamber, determine the number of the ungrown hydraulic chamber; Step S6558: Obtain the liquid discharge signal corresponding to the number of the ungrown hydraulic chamber; Step S6559: When a liquid discharge signal is present, determine the abnormal pressure-stabilizing check valve number based on the number of the ungrown hydraulic chamber and output it.

[0025] By adopting the above technical solution, under the condition that the reciprocating transmission mechanism is in a stable position at the bottom and there is no pushing pressure increase interference, a secondary verification is performed on the hydraulic chamber without oil pressure increase. Relying on the characteristic that the discharge of fluid from the second hydraulic chamber will reduce the oil pressure in the first hydraulic chamber, the micro-leakage of the pressure-stabilizing check valve and the backflow of media faults that are masked by the pressure increase due to the discharge pressure relief offsetting the pressure increase are identified. This solves the problem of missed detections when relying solely on pressure increase to determine leakage.

[0026] In summary, the present invention has at least one of the following beneficial technical effects: 1. The dual hydraulic chambers and the material conveying chamber are integrated into the main chamber of the same hydraulic cylinder. The single transmission push rod forms the integral shape, which greatly improves the spatial coupling of the pump body chamber and the integration of the whole machine. The traditional external split chamber structure is eliminated, which effectively reduces the size of the equipment and simplifies the assembly structure. This solves the problems of dispersed chambers and low integration of traditional diaphragm pumps. 2. Multiple conveying components share a single pressure relief component, combined with independent pressure relief structures for each branch. This ensures high-flow-rate coordinated conveying by multiple pump groups while reducing redundant components, lowering equipment manufacturing and maintenance costs. Furthermore, a single branch failure does not affect the normal operation of the remaining pump groups, resulting in higher equipment stability. 3. Through intelligent control logic such as adaptive frequency adjustment for discharge rate deviation, gradient frequency reduction during blockage, self-checking of pressure relief in multiple branches, and secondary verification of hidden leakage, the fully automatic operation effect of adaptive compensation for discharge flow, autonomous unblocking of blockage, and self-checking of pressure stabilizing check valve faults is achieved, thereby improving the automation level of the equipment. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of a hydraulic diaphragm pump device according to an embodiment of this application; Figure 2 This is a schematic flowchart of a diaphragm pumping liquid delivery method according to an embodiment of this application; Figure 3 This is a flowchart illustrating the method for performing the correction reciprocating push operation in an embodiment of this application; Figure 4 This is a flowchart illustrating the method for performing material blockage clearing operations in an embodiment of this application.

[0028] The parts referred to by the numbers in the above attached figures are as follows: 1. Oil reservoir shell; 11. Reciprocating transmission mechanism; 111. Driven end of transmission; 112. Driven end of transmission; 2. Pressure relief assembly; 21. Pressure stabilizing check valve; 22. Pressure relief valve; 3. Hydraulic power conversion assembly; 31. Hydraulic cylinder body; 32. Transmission push rod; 321. Throttling oil replenishment hole; 4. Inlet / outlet assembly; 41. Inlet valve; 42. Outlet valve; 5. Diaphragm medium conveying assembly; 51. Isolation diaphragm; 52. Feed check valve; 53. Discharge check valve; 54. Feed inlet; 55. Discharge outlet; 6. Main chamber; 61. First hydraulic chamber; 62. Second hydraulic chamber; 63. Material conveying chamber; 631. First material conveying chamber; 632. Second material conveying chamber. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] This invention discloses a hydraulic diaphragm pump device. (Refer to...) Figure 1 A hydraulic diaphragm pump device includes an oil storage housing 1, a reciprocating transmission mechanism 11, a pressure relief assembly 2, a hydraulic power conversion assembly 3, an inlet / outlet liquid assembly 4, and a diaphragm medium conveying assembly 5.

[0031] The reciprocating transmission mechanism 11 includes a driving end 111 and a driven end 112. The driving end 111 is fixedly mounted on the oil reservoir 1. The driving end 111 is externally connected to a drive motor, which drives the driving end 111 to perform linear reciprocating motion, thereby causing the driven end 112 connected to it to move in a linear reciprocating motion.

[0032] The oil storage shell 1 is filled with lubricating medium, and the oil storage shell 1 completely covers the transmission drive end 111. During the operation of the equipment, the lubricating medium continuously wets the transmission drive end 111, achieving uninterrupted lubrication.

[0033] The hydraulic power conversion assembly 3 includes a hydraulic cylinder body 31 and a transmission push rod 32. The hydraulic cylinder body 31 has a main chamber 6 formed inside. The transmission push rod 32 is sealed and assembled within the main chamber 6 and is slidably connected to the chamber wall of the main chamber 6. The transmission push rod 32 divides the main chamber 6 into two independent hydraulic chambers 61 and 62. The driven end 112 extends into the first hydraulic chamber 61 and can output reciprocating linear power, providing a drive source for the entire hydraulic diaphragm pump device.

[0034] The inlet / outlet assembly 4 includes an inlet valve 41 and an outlet valve 42. The inlet valve 41 and outlet valve 42 are fixedly connected to the hydraulic cylinder body 31. The inlet valve 41 and outlet valve 42 communicate with the second hydraulic chamber 62, allowing hydraulic working medium to be introduced into the second hydraulic chamber 62 or discharged outwards.

[0035] The diaphragm media conveying assembly 5 includes an isolation diaphragm 51, a feed check valve 52, and a discharge check valve 53. The isolation diaphragm 51 is fixedly installed in the main chamber 6. The hydraulic cylinder body 31 has a first material conveying chamber 631 and a second material conveying chamber 632. The first material conveying chamber 631 and the second material conveying chamber 632 are located on the side of the isolation diaphragm 51 away from the first hydraulic chamber 61. One end of the first material conveying chamber 631 is connected to the feed check valve 52. The end of the first material conveying chamber 631 away from the feed check valve 52 is connected to the isolation diaphragm 51. One end of the second material conveying chamber 632 is connected to the discharge check valve 53. The end of the second material conveying chamber 632 away from the discharge check valve 53 is connected to the isolation diaphragm 51. The end of the feed check valve 52 away from the first material conveying chamber 631 is connected to an inlet 54. The end of the discharge check valve 53 away from the second material conveying chamber 632 is connected to an outlet 55 for discharging the conveyed material. The first material conveying chamber 631 and the second material conveying chamber 632 are connected to form the material conveying chamber 63.

[0036] The end of the transmission push rod 32 near the first material conveying chamber 631 is fixedly connected to the isolation diaphragm 51. The isolation diaphragm 51 completely physically isolates the hydraulic working medium in the first hydraulic chamber 61 and the second hydraulic chamber 62 from the medium to be conveyed in the material conveying chamber 63. The two media do not come into contact with each other and pressure is transmitted only by the isolation diaphragm 51.

[0037] The transmission push rod 32 has a throttling oil replenishment hole 321. The hydraulic working medium inside the second hydraulic chamber 62 enters the first hydraulic chamber 61 through the throttling oil replenishment hole 321. Specifically, when the transmission drive end 111 drives the transmission driven end 112 to push, the transmission driven end 112 squeezes the hydraulic medium in the first hydraulic chamber 61, making the first hydraulic chamber 61 high pressure. The high pressure hydraulic medium pushes the transmission push rod 32 to move closer to the isolation diaphragm 51. When the transmission driven end 112 retracts, the volume of the first hydraulic chamber 61 expands to form a negative pressure. The low pressure hydraulic medium drives the transmission push rod 32 to move away from the isolation diaphragm 51. At this time, the hydraulic working medium in the second hydraulic chamber 62 flows into the first hydraulic chamber 61 through the throttling oil replenishment hole 321 inside the transmission push rod 32, completing the replenishment of the medium in both chambers.

[0038] When a negative pressure is formed in the material conveying chamber 63, the discharge check valve 53 automatically closes and the inlet check valve 52 opens, and the external medium to be conveyed is sucked into the material conveying chamber 63; when the transmission push rod 32 pushes the isolation diaphragm 51 to squeeze the material conveying chamber 63 and the chamber is pressurized, the inlet check valve 52 closes and the discharge check valve 53 opens, and the medium to be conveyed in the chamber is discharged outward.

[0039] In this embodiment, the reciprocating transmission mechanism 11, the hydraulic power conversion component 3, the inlet / outlet liquid component 4, and the diaphragm medium conveying component 5 together constitute a set of liquid separation and conveying components. The hydraulic diaphragm pump device can be equipped with several sets of liquid separation and conveying components. All liquid separation and conveying components share the same set of pressure relief components 2, which includes a pressure-stabilizing check valve 21 and a pressure relief valve 22. The number of pressure-stabilizing check valves 21 is the same as the number of liquid separation and conveying components, and each is connected to the first hydraulic chamber 61 of the liquid separation and conveying components. Each pressure-stabilizing check valve 21 is connected to a pressure relief valve 22. The pressure relief valve 22 is connected to the first hydraulic chamber 61 of each set of liquid separation and conveying components through the pressure-stabilizing check valve 21. When the pressure inside the first hydraulic chamber 61 of any set of liquid separation and conveying components exceeds a preset first hydraulic chamber safety pressure threshold, the corresponding pressure-stabilizing check valve 21 is opened, releasing the overpressured hydraulic working medium in the first hydraulic chamber 61 into the pressure relief valve 22, achieving single-path independent pressure relief protection.

[0040] Based on the same inventive concept, embodiments of the present invention provide a diaphragm pumping method for liquid delivery.

[0041] Reference Figure 2 A diaphragm pump method for delivering liquid, comprising: Step S1: In response to the liquid inlet signal, obtain the preset reference reciprocating push frequency, and control the reciprocating transmission mechanism 11 to perform reciprocating push operation according to the reference reciprocating push frequency.

[0042] The liquid inlet signal is the trigger signal that the equipment starts conveying and begins to supply the medium to be conveyed into the material conveying chamber 63.

[0043] The baseline reciprocating push frequency refers to the standard initial reciprocating motion frequency set to meet the discharge flow rate target.

[0044] The reciprocating push operation refers to the reciprocating transmission mechanism 11 driving the driven end 112 to reciprocate and extend, squeezing and releasing the hydraulic medium in the first hydraulic chamber 61, thereby driving the isolation diaphragm 51 to alternately complete the cyclic driving action of material suction and discharge.

[0045] Step S2: Obtain the discharge rate corresponding to the discharge check valve 53 in real time.

[0046] The discharge rate refers to the volume of the medium to be transported discharged through the current discharge check valve 53 per unit time.

[0047] Step S3: Obtain the discharge rate deviation value based on the discharge rate and the preset effective discharge rate threshold.

[0048] The effective discharge rate threshold refers to the standard and compliant discharge flow rate threshold per unit time under the equipment's process requirements.

[0049] The discharge rate deviation value refers to the difference between the real-time discharge rate and the effective discharge rate, which is obtained by subtracting the effective discharge rate threshold from the discharge rate.

[0050] Step S4: Obtain the current reciprocating push frequency, and perform a corrected reciprocating push operation based on the discharge rate deviation value and the baseline reciprocating push frequency.

[0051] Correcting the reciprocating push operation refers to the frequency adjustment process that adjusts the reciprocating push frequency based on the baseline reciprocating push frequency and the material discharge rate deviation value, so that the real-time material discharge rate approaches the effective material discharge rate threshold.

[0052] Step S5: Real-time acquisition of the internal pressure of the first hydraulic chamber.

[0053] The internal pressure of the first hydraulic chamber refers to the real-time oil pressure of the hydraulic working medium in the first hydraulic chamber 61 acting on the chamber wall and the transmission push rod 32. It is collected in real time by a pressure sensor installed on the chamber wall of the first hydraulic chamber 61, and the internal pressure of the first hydraulic chamber corresponding to the reciprocating push operation can be obtained in real time.

[0054] Step S6: Determine the pressure increment of the first hydraulic chamber based on the internal pressure of the first hydraulic chamber.

[0055] The pressure increment within the first hydraulic chamber refers to the incremental change in pressure within the first hydraulic chamber corresponding to two consecutive reciprocating push operations. When the incremental change in pressure within the first hydraulic chamber is negative, there is no pressure increment within the first hydraulic chamber.

[0056] Step S7: When the pressure increment inside the first hydraulic chamber exceeds the preset normal increment range, output a material blockage signal and perform a material blockage clearing operation.

[0057] The normal incremental range refers to the normal range of pressure increase allowed inside the first hydraulic chamber 61 corresponding to two adjacent reciprocating push operations under normal conveying conditions. It is used to identify whether the material conveying chamber 63 is blocked.

[0058] Material blockage signal refers to a fault warning signal used to indicate that the flow of material in the discharge pipeline is obstructed or that material is stuck in the pipeline.

[0059] The material blockage clearing operation refers to the entire control process of relieving pipeline pressure buildup and clearing blockages by gradually reducing the frequency of reciprocating push and depressurizing. This will be detailed in steps S60 to S65.

[0060] When the pressure increment inside the first hydraulic chamber exceeds the normal increment range, it indicates that the back pressure on the material side is abnormally high during a single push, and there is a tendency for material accumulation and poor flow in the discharge pipeline.

[0061] Step S8: When the internal pressure of the first hydraulic chamber exceeds the safe pressure threshold of the first hydraulic chamber, output a pressure relief signal.

[0062] The first hydraulic chamber safety pressure threshold refers to the upper limit of oil pressure that prevents the hydraulic cylinder body 31 and the isolation diaphragm 51 from being damaged by high pressure.

[0063] The pressure relief signal refers to the branch control command sent to the pressure relief component 2, which controls only the pressure-stabilizing check valve 21 corresponding to the first hydraulic chamber 61 that is currently overpressured to open, releasing only the high-pressure hydraulic medium in the first hydraulic chamber 61 of the liquid separation and conveying component, while the other pressure-stabilizing check valves 21 remain closed, without affecting the normal operation of the other liquid separation and conveying components.

[0064] When the internal pressure of the first hydraulic chamber exceeds the safe pressure threshold of the first hydraulic chamber, it indicates that the current oil pressure of the first hydraulic chamber 61 has exceeded the safe tolerance range of the equipment. Continuous high pressure will cause the hydraulic cylinder 31 and the isolation diaphragm 51 to be damaged by pressure. It is necessary to immediately output a pressure relief signal to protect the equipment.

[0065] Reference Figure 3 The method for performing corrective reciprocating push operations based on the discharge rate deviation and the baseline reciprocating push frequency includes: Step S40: When the discharge rate deviation value is negative, obtain the current internal pressure of the first hydraulic chamber.

[0066] The current internal pressure of the first hydraulic chamber refers to the hydraulic medium oil pressure inside the first hydraulic chamber 61 of the liquid separation and conveying component, which is collected in real time by the pressure sensor under the current corrective reciprocating push operation condition.

[0067] When the discharge rate deviation is negative, it indicates that the real-time discharge flow rate is lower than the lower limit of the qualified flow rate required by the process. It is necessary to determine whether the reciprocating push frequency is too low or the hydraulic pressure is insufficient.

[0068] Step S41: If the current internal pressure of the first hydraulic chamber falls within the preset effective pressure insufficient range, determine the hydraulic insufficient component number, and output a fluid replenishment signal based on the hydraulic insufficient component number.

[0069] The effective pressure insufficient range refers to the lower limit range of oil pressure that ensures the transmission push rod 32 can complete its normal retraction stroke and that the throttling oil replenishment hole 321 can normally connect the two chambers.

[0070] If the pressure inside the first hydraulic chamber falls within the range of insufficient effective pressure, it indicates that the total amount of hydraulic medium in the first hydraulic chamber 61 is insufficient, the push rod retraction displacement is insufficient, the throttling oil replenishment hole 321 cannot complete the automatic oil replenishment of the two chambers normally, and the low flow rate is caused by the lack of oil pressure, so it is necessary to replenish the hydraulic medium.

[0071] The hydraulic under-pressure component number refers to the number of the liquid separation and conveying component whose oil pressure is below the effective pressure range and requires fluid replenishment.

[0072] The replenishment signal is a control command signal sent to the inlet valve 41 of the inlet / outlet component 4 to control the inlet valve 41 to open and replenish the hydraulic medium to the second hydraulic chamber 62.

[0073] Step S42: If the current internal pressure of the first hydraulic chamber does not fall within the effective pressure insufficient range, determine the incremental reciprocating push frequency queue based on the discharge rate deviation value, and perform the corrective reciprocating push operation based on the incremental reciprocating push frequency queue.

[0074] An incremental reciprocating push frequency queue refers to a time-series frequency sequence formed by gradually increasing the push frequency according to a preset gradient increment, based on the current reciprocating push frequency. This is used to increase the number of pushes per unit time and improve the output flow rate. The gradient increment value refers to the fixed value of frequency increase corresponding to each reciprocating push operation. This fixed value is pre-calibrated according to the particle size and viscosity of the material being transported. In this embodiment, different gradient increment and gradient decrement values ​​are used for different particle sizes and viscosities of the transported materials.

[0075] If the pressure inside the first hydraulic chamber is not within the range of insufficient effective pressure, it indicates that the hydraulic medium inside the chamber is sufficient and the oil pressure is normal. The low flow rate is only caused by the low pushing frequency. The pushing frequency can be directly increased to compensate for the discharge flow rate.

[0076] Step S43: Obtain the internal pressure of the first hydraulic chamber in real time.

[0077] The corrected internal pressure of the first hydraulic chamber refers to the real-time oil pressure of the first hydraulic chamber 61 obtained in real time after the frequency adjustment is completed by increasing the frequency push queue.

[0078] Step S44: If the internal pressure of the first hydraulic chamber falls within the preset effective pressure risk range, determine the excess hydraulic chamber number and output a pressure relief signal based on the excess hydraulic chamber number.

[0079] The effective pressure risk range refers to the high pressure range that approaches the safe pressure threshold of the first hydraulic chamber. At this time, a corrective reciprocating push operation is being performed through an increasing reciprocating push frequency queue. Therefore, the hydraulic pressure will continue to increase. So it is necessary to determine an effective pressure risk range that is lower than the safe pressure threshold of the first hydraulic chamber to predict the overpressure risk in advance.

[0080] The excess hydraulic chamber number refers to the number of the liquid separation and delivery component where the oil pressure falls into the effective pressure risk range and requires pressure relief and stabilization.

[0081] If the pressure inside the first hydraulic chamber falls within the effective pressure risk range, it indicates that the excessive pushing frequency is causing continuous high pressure inside the chamber. The corresponding pressure-stabilizing check valve 21 needs to be opened to release excess hydraulic medium and stabilize the oil pressure inside the chamber. Under this condition, a dynamic equilibrium working cycle will be formed, with the inlet valve 41 continuously replenishing fluid and the pressure relief valve 22 periodically releasing pressure.

[0082] Step S45: During the execution of the correction reciprocating push operation, the current discharge rate deviation value is obtained in real time. If the current discharge rate deviation value is not negative, the correction reciprocating push operation is stopped.

[0083] The current discharge rate deviation value refers to the difference between the real-time discharge rate and the effective discharge rate after the frequency is increased.

[0084] If the current discharge rate deviation is not negative, it means that the real-time discharge flow rate has reached the qualified range required by the process, and there is no need to continue to increase the push frequency. Therefore, the correction reciprocating push operation is stopped.

[0085] Reference Figure 4 The methods for performing material blockage clearing operations include: Step S60: Obtain the current push frequency.

[0086] The forward reciprocating push frequency refers to the real-time reciprocating motion frequency of the reciprocating transmission mechanism 11 before the material blockage clearing operation is performed.

[0087] Step S61: Determine the decreasing push frequency curve based on the current repeat push frequency.

[0088] The decreasing push frequency curve refers to the time-series change curve formed by gradually reducing the push frequency corresponding to each reciprocating push operation according to a preset gradient decrease value, starting from the current reciprocating push frequency. It is used to smoothly reduce the conveying flow rate, determine the appropriate reciprocating push frequency, and gradually reduce the conveying frequency. This can slow down the accumulation speed of materials at the blockage location while ensuring the basic conveying capacity, leaving a buffer space for the blockage material to fall back and clear naturally.

[0089] The gradient decrease value refers to the fixed difference in frequency decrease corresponding to each reciprocating push operation. This value is pre-calibrated based on the particle size and viscosity of the material being transported.

[0090] Step S62: Perform push frequency reduction operation based on the decreasing push frequency curve.

[0091] The push frequency reduction operation refers to the operation of gradually reducing the actual frequency of each reciprocating push operation according to the decreasing push frequency curve. In order to gradually reduce the number of material suction and discharge times per unit time in a gradient slowdown manner, the total amount of material entering the blocked section of the pipeline per unit time is reduced, the material accumulation pressure at the blockage location is relieved, and a buffer time is left for the already accumulated material to slide down naturally and gradually clear the blockage, so as to avoid the blockage problem from being further aggravated.

[0092] Step S63: During the push frequency reduction operation, the current pressure increment of the first hydraulic chamber is determined in real time based on the internal pressure of the first hydraulic chamber.

[0093] The pressure increment within the first hydraulic chamber refers to the incremental change in pressure within the first hydraulic chamber corresponding to two consecutive reciprocating push operations. If the incremental change in pressure within the first hydraulic chamber is negative, it is determined that there is no pressure increment within the first hydraulic chamber.

[0094] Step S64: When there is no pressure increment inside the first hydraulic chamber, stop the push frequency reduction operation.

[0095] When there is no increase in the pressure inside the first hydraulic chamber, it indicates that the material accumulation trend in the pipeline has been alleviated after the gradient frequency reduction, the oil pressure no longer continues to rise, the risk of blockage is eliminated, and there is no need to continue to reduce the pushing frequency. At this time, the pushing frequency reduction operation is stopped.

[0096] Step S65: When there is an increasing pressure inside the first hydraulic chamber, perform a pressure relief operation.

[0097] The pressure relief operation refers to the operation of issuing a branch control command to the pressure relief component 2 to the corresponding pressure stabilizing check valve 21, opening only the pressure stabilizing check valve 21 of the liquid separation and delivery component with the current pressure increment in the first hydraulic chamber, and releasing the high-pressure hydraulic medium in the first hydraulic chamber 61 connected to the pressure stabilizing check valve 21 to the pressure relief valve 22.

[0098] When there is an increasing pressure inside the first hydraulic chamber, it indicates that even if the reciprocating push frequency has been adjusted downward according to the gradient curve, the pressure inside the first hydraulic chamber continues to rise, the blockage has not been naturally relieved, and the back pressure on the material side continues to rise. It is necessary to protect the equipment by conducting a pressure relief operation.

[0099] The methods for performing the pressure relief operation include: Step S650: Obtain the current liquid separation and delivery component number, and determine the current pressure-stabilizing check valve number based on the current liquid separation and delivery component number.

[0100] The current liquid separation conveying component number refers to the number assigned to each independent liquid separation conveying component within the equipment, used to distinguish multiple parallel liquid separation conveying components.

[0101] The current pressure-stabilizing check valve number refers to the number of the pressure-stabilizing check valve 21 that corresponds one-to-one with the first hydraulic chamber 61 of the liquid separation and conveying assembly, and is used to locate the corresponding pressure-stabilizing check valve 21.

[0102] Step S651: Perform a pressure relief operation based on the current pressure-regulating check valve number.

[0103] When the current pressure-stabilizing check valve number exists, it means that the pressure-stabilizing check valve 21 that is experiencing a blockage and pressure rise can be located, and only the pressure-stabilizing check valve 21 needs to be individually opened.

[0104] Step S652: During the pressure relief operation, the pressure increment of the hydraulic chamber is determined in real time based on the pressure inside the first hydraulic chamber.

[0105] The pressure increment inside the hydraulic chamber is the pressure change increment of the first hydraulic chamber obtained from two consecutive pressure acquisitions of the current liquid separation and delivery component number after the pressure relief operation is performed.

[0106] If the pressure change increment inside the first hydraulic chamber is negative, it indicates that the oil pressure has begun to drop after the pressure relief is initiated, and there is no pressure increase inside the initiated hydraulic chamber.

[0107] Step S653: Accumulate the number of consecutive increases in the conduction pressure based on the increment value of the internal pressure of the conduction hydraulic chamber.

[0108] The number of consecutive pressure increases refers to the cumulative number of positive pressure increments continuously collected during the pressure relief and conduction process. Each time the pressure inside the first hydraulic chamber increases positively, it is counted once.

[0109] Step S654: When the number of consecutive increases in conduction pressure exceeds the preset effective blockage number threshold, a complete blockage signal is output.

[0110] The effective blockage threshold refers to the critical number of consecutive increases required to determine severe blockage, obtained through experiments involving multiple blockages of the material channel.

[0111] The complete blockage signal is a severe fault alarm signal that specifically indicates that the discharge pipeline is completely blocked and cannot be cleared by reducing the frequency and short-term pressure relief, so as to prompt manual intervention.

[0112] When the number of consecutive increases in the conduction pressure exceeds the preset effective blockage threshold, it indicates that even if the pressure-stabilizing check valve 21 continues to release oil, the pressure increase effect on the material side caused by a single push still exceeds the pressure relief effect, and the discharge pipeline is severely blocked and cannot be cleared by itself.

[0113] Step S655: Stop performing the conduction pressure relief operation when there is no longer a continuous increase in the conduction pressure.

[0114] When there is no continuous increase in the conduction pressure, it indicates that the oil pressure in the cavity has been continuously decreasing after the pressure relief is opened, and there is no continuous pressure increase trend. The pipeline blockage trend has been relieved, and there is no need to continue to relieve pressure. The conduction pressure relief operation can be stopped and the pressure stabilizing check valve 21 can be closed to restore normal delivery regulation.

[0115] This also includes: Step S6550: During the pressure relief operation, determine the number of the unrelieved liquid separation and delivery component based on the current pressure-stabilizing check valve number.

[0116] The unrelieved liquid separation and conveying component number refers to the number of each group of liquid separation and conveying components that, apart from the pressure-regulating check valve 21 which is currently being depressurized, has not issued a pressure relief control command and whose upstream pressure-regulating check valve 21 is theoretically kept closed and sealed.

[0117] Step S6551: Obtain the position of the reciprocating transmission mechanism corresponding to the number of the unrelieved liquid separation and conveying component in real time.

[0118] The position of the reciprocating transmission mechanism refers to the real-time travel coordinates of the driven end 112 of the transmission, which are collected by the displacement sensor.

[0119] Step S6552: When the reciprocating transmission mechanism is at the preset reciprocating transmission bottom position, the pressure at the bottom of the unrelieved hydraulic chamber is determined in real time.

[0120] The bottom position of the reciprocating transmission refers to the stable position where the reciprocating transmission mechanism 11 retracts to its maximum limit stroke (corresponding to the material suction operation), the transmission push rod 32 is fully retracted, and the volume of the first hydraulic chamber 61 reaches its maximum value. At this position, there is no pressure increase effect from the transmission push rod 32 squeezing the material.

[0121] The pressure at the bottom of the unrelieved hydraulic chamber refers to the hydraulic medium pressure inside the chamber, which is collected in real time by the pressure sensor in the first hydraulic chamber 61 corresponding to the unrelieved liquid separation and conveying component.

[0122] When the reciprocating transmission mechanism is at the bottom position of the reciprocating transmission, it means that the oil pressure fluctuation interference caused by the reciprocating pushing and squeezing of materials has been eliminated. At this time, the oil pressure change is only caused by three external factors: the hydraulic flow in the first hydraulic chamber 61 caused by the leakage of the pressure stabilizing check valve 21, the replenishment of fluid, and the discharge of fluid. Leakage determination can be carried out.

[0123] Step S6553: Determine the pressure increment at the bottom of the unrelieved hydraulic chamber based on the pressure at the bottom of the unrelieved hydraulic chamber.

[0124] The pressure increment at the bottom of the unrelieved hydraulic chamber refers to the change in the oil pressure at the bottom of the first hydraulic chamber 61 between two adjacent pressure acquisition cycles when the reciprocating transmission mechanism is at the bottom position of the reciprocating transmission. In this process, only the positive upward value is considered as the effective increment.

[0125] Step S6554: When the pressure increment at the bottom of the unrelieved hydraulic chamber falls within the preset abnormal increment range, determine the number to be verified.

[0126] The abnormal increment range refers to the positive oil pressure rise range that exceeds the normal gravity static pressure fluctuation range, indicating that there is a continuous influx of external high-pressure medium into the chamber.

[0127] The verification number refers to the number of the unrelieved liquid separation and conveying component that was detected as having an abnormal increase in oil pressure and requires further elimination of interference from fluid replenishment to confirm whether there is a leak.

[0128] When the pressure increment at the bottom of the unrelieved hydraulic chamber falls into the abnormal increment range, it indicates that the oil pressure in the first hydraulic chamber 61 corresponding to the pressure-stabilizing check valve 21 continues to rise at the bottom working position where there is no material compression, and there is a suspicion of high-pressure medium backflow. At this time, there is no impact from the liquid discharge operation, but it is necessary to further verify whether it is caused by the liquid replenishment operation.

[0129] Step S6555: Obtain the fluid replenishment signal corresponding to the number to be verified.

[0130] Step S6556: When there is no liquid replenishment signal, determine the abnormal pressure stabilizing check valve number based on the number to be verified, and output the corresponding liquid discharge signal based on the abnormal pressure stabilizing check valve number.

[0131] The abnormal pressure-stabilizing check valve number refers to the faulty pressure-stabilizing check valve number where there is a sealing leak and the high-pressure medium of the upstream pressure-stabilizing check valve 21 flows back into its first hydraulic chamber 61 through the common pressure relief manifold.

[0132] The liquid discharge signal refers to the control signal that controls the opening of the corresponding liquid separation and conveying component's liquid outlet valve 42, completing the liquid discharge operation of the second hydraulic chamber 62 and exporting the hydraulic working medium from the second hydraulic chamber 62. After the liquid outlet valve 42 is opened, the hydraulic working medium in the second hydraulic chamber 62 is discharged outward, and the oil pressure in the second hydraulic chamber 62 decreases synchronously.

[0133] When there is no replenishment signal, it indicates that the increase in hydraulic pressure is not due to the increase in medium brought about by replenishing the second hydraulic chamber 62 with liquid from the inlet valve 41. The only cause is that the high-pressure medium discharged from the upstream pressure-stabilizing check valve 21 flows back into the corresponding first hydraulic chamber 61 through the pressure-stabilizing check valve 21 with a failed seal. It can be determined that the pressure-stabilizing check valve 21 is leaking. The abnormal pressure-stabilizing check valve number is output to prompt manual repair, and the second hydraulic chamber 62 is opened through the liquid discharge signal to discharge the excess hydraulic working medium.

[0134] This also includes a method for determining the abnormal pressure-stabilizing check valve number when there is no pressure increment at the bottom of the unrelieved hydraulic chamber. This method includes: Step S6557: When there is no pressure increment at the bottom of the unrelieved hydraulic chamber, determine the number of the ungrown hydraulic chamber.

[0135] The "unincreased hydraulic chamber number" refers to the first hydraulic chamber number corresponding to the unrelieved liquid separation and conveying component when the reciprocating transmission mechanism 11 is located at the bottom of the reciprocating transmission and no positive oil pressure increment is detected.

[0136] When there is no pressure increase at the bottom of the unrelieved hydraulic chamber, there are two situations: the first is that there is no backflow of medium, and the leakage of the pressure stabilizing check valve 21 can be directly ruled out; the second is that there is a leakage in the pressure stabilizing check valve 21, and the upstream high-pressure medium continues to backflow and increase pressure, but the drainage of the second hydraulic chamber 62 cancels the oil pressure increase, so the fault cannot be directly determined, and further verification is required.

[0137] Step S6558: Obtain the liquid discharge signal corresponding to the number of the ungrown hydraulic chamber.

[0138] When the reciprocating transmission mechanism 11 is in the bottom position, the transmission push rod 32 retracts to its position, and the throttling oil replenishment hole 321 connects the first hydraulic chamber 61 and the second hydraulic chamber 62, allowing the hydraulic media in the two chambers to communicate. If the outlet valve 42 opens at this time, the hydraulic media inside the second hydraulic chamber 62 is discharged outward, reducing the oil pressure in the second hydraulic chamber 62. This will simultaneously carry away the media in the first hydraulic chamber 61, lowering the oil pressure in the first hydraulic chamber 61. Even if the high-pressure media from the upstream pressure-stabilizing check valve 21 continues to flow back into the first hydraulic chamber 61, the pressure-boosting effect will be offset by the discharge and pressure relief from the second hydraulic chamber 62, and no positive pressure increment will be detected. This process identifies this type of masked leakage fault by verifying the discharge signal, avoiding missed detection.

[0139] Step S6559: When a liquid discharge signal is present, determine the abnormal pressure-stabilizing check valve number based on the number of the ungrown hydraulic chamber and output it.

[0140] When a liquid discharge signal is present, it indicates that the reciprocating mechanism is in the bottom position, and the throttling oil replenishment hole 321 inside the transmission push rod 32 connects the first hydraulic chamber 61 and the second hydraulic chamber 62. The pressure stabilizing check valve 21 corresponding to the un-increased hydraulic chamber number fails to seal, and the high-pressure medium of the upstream pressure stabilizing check valve 21 continues to backflow into the first hydraulic chamber 61 through the common pressure relief manifold. It should generate a positive oil pressure increment, but the liquid outlet valve 42 opens to discharge the hydraulic working medium of the second hydraulic chamber 62. After the two chambers are interconnected, the oil pressure of the first hydraulic chamber 61 is synchronously pulled down, and the pressure increment is completely canceled. No pressure increment is detected on the surface, but there is actually a leakage fault in the pressure stabilizing check valve 21. Therefore, the output will output the pressure stabilizing check valve number corresponding to the un-increased hydraulic chamber number as the abnormal pressure stabilizing check valve number.

[0141] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0142] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A hydraulic diaphragm pump device, characterized in that: It includes an oil storage shell (1), a reciprocating transmission mechanism (11), a hydraulic power conversion component (3), a diaphragm medium conveying component (5), a pressure relief component (2), and an inlet / outlet liquid component (4). The hydraulic power conversion assembly (3) includes a hydraulic cylinder (31) and a transmission push rod (32). The hydraulic cylinder (31) is located inside the oil storage shell (1). A main chamber (6) is opened inside the hydraulic cylinder (31). The transmission push rod (32) is slidably and sealedly assembled inside the main chamber (6). The diaphragm medium conveying assembly (5) includes an isolation diaphragm (51), a feed check valve (52) disposed in the hydraulic cylinder body (31), and a discharge check valve (53) disposed in the hydraulic cylinder body (31). The isolation diaphragm (51) is disposed in the main chamber (6). The hydraulic cylinder body (31) has a first material conveying chamber (631) and a second material conveying chamber (632). One end of the first material conveying chamber (631) is connected to the feed check valve (52). The end of the first material conveying chamber (632) away from the feed check valve (52) is connected to the isolation diaphragm (51), the end of the second material conveying chamber (632) is connected to the discharge check valve (53), the end of the second material conveying chamber (632) away from the discharge check valve (53) is connected to the isolation diaphragm (51), the end of the feed check valve (52) away from the first material conveying chamber (631) is connected to the feed inlet (54), and the end of the discharge check valve (53) away from the second material conveying chamber (632) is connected to the discharge outlet (55). The transmission push rod (32) divides the main chamber (6) into two independent hydraulic chambers, a first hydraulic chamber (61) and a second hydraulic chamber (62). The isolation diaphragm (51) is fixedly connected to the end of the transmission push rod (32) near the first material conveying chamber (631). The reciprocating transmission mechanism (11) is provided on the oil storage shell (1). The reciprocating transmission mechanism (11) includes a transmission driving end (111) and a transmission driven end (112). The transmission driven end (112) extends into the first hydraulic chamber (61). The pressure relief assembly (2) is mounted on the hydraulic cylinder body (31) and communicates with the first hydraulic chamber (61). The inlet / outlet fluid assembly (4) is mounted on the hydraulic cylinder body (31) and communicates with the second hydraulic chamber (62).

2. The hydraulic diaphragm pump device according to claim 1, characterized in that: The oil storage shell (1) contains a lubricating medium, and the oil storage shell (1) completely covers the transmission drive end (111). The transmission drive end (111) is continuously lubricated by the lubricating medium. The transmission push rod (32) is provided with a throttling oil replenishment hole (321), and the hydraulic working medium inside the second hydraulic chamber (62) can be replenished to the first hydraulic chamber (61) through the throttling oil replenishment hole (321).

3. The hydraulic diaphragm pump device according to claim 2, characterized in that: The liquid inlet / outlet assembly (4) includes an inlet valve (41) and an outlet valve (42). The inlet valve (41) is used to introduce hydraulic working medium into the second hydraulic chamber (62), and the outlet valve (42) is used to discharge hydraulic working medium from the second hydraulic chamber (62).

4. A hydraulic diaphragm pump device according to claim 3, characterized in that: The reciprocating transmission mechanism (11), the hydraulic power conversion component (3), the liquid inlet / outlet component (4), and the diaphragm medium conveying component (5) constitute a liquid separation and conveying component; The liquid separation and conveying components are of a certain number, and the liquid separation and conveying components share the same pressure relief component (2). The pressure relief component (2) includes a pressure stabilizing check valve (21) corresponding to the number of liquid separation and conveying components, and a pressure relief valve (22) connected to the pressure stabilizing check valve (21). The pressure stabilizing check valve (21) is connected to the first hydraulic chamber (61) of each liquid separation and conveying component, and is used to release the hydraulic medium when the internal pressure of the first hydraulic chamber corresponding to any first hydraulic chamber (61) exceeds the safety pressure threshold of the first hydraulic chamber.

5. A diaphragm pumping method, applied to a hydraulic diaphragm pump device as described in claim 4, characterized in that, include: Step S1: In response to the liquid inlet signal, obtain the preset reference reciprocating push frequency, and control the reciprocating transmission mechanism (11) to perform reciprocating push operation according to the reference reciprocating push frequency; Step S2: Real-time acquisition of the discharge rate corresponding to the discharge check valve (53); Step S3: Obtain the discharge rate deviation value based on the discharge rate and the preset effective discharge rate threshold; Step S4: Obtain the current reciprocating push frequency, and perform a corrected reciprocating push operation based on the discharge rate deviation value and the baseline reciprocating push frequency; Step S5: During the reciprocating push operation, the internal pressure of the first hydraulic chamber is collected in real time; Step S6: Determine the pressure increment of the first hydraulic chamber based on the internal pressure of the first hydraulic chamber; Step S7: When the pressure increment inside the first hydraulic chamber exceeds the preset normal increment range, output a material blockage signal and perform a material blockage clearing operation; Step S8: When the internal pressure of the first hydraulic chamber exceeds the safe pressure threshold of the first hydraulic chamber, output a pressure relief signal.

6. The diaphragm pumping method according to claim 5, characterized in that, The method for performing corrective reciprocating push operations based on the discharge rate deviation and the baseline reciprocating push frequency includes: Step S40: When the discharge rate deviation value is negative, obtain the current internal pressure of the first hydraulic chamber; Step S41: If the pressure inside the first hydraulic chamber falls within the preset effective pressure deficiency range, determine the hydraulic deficiency component number and output a fluid replenishment signal based on the hydraulic deficiency component number; Step S42: If the current internal pressure of the first hydraulic chamber does not fall within the effective pressure insufficient range, determine the incremental reciprocating push frequency queue based on the discharge rate deviation value, and perform the corrective reciprocating push operation based on the incremental reciprocating push frequency queue. Step S43: Real-time acquisition and correction of the internal pressure of the first hydraulic chamber; Step S44: If the internal pressure of the first hydraulic chamber falls within the preset effective pressure risk range, determine the excess hydraulic chamber number and output a pressure relief signal based on the excess hydraulic chamber number; Step S45: During the execution of the correction reciprocating push operation, the current discharge rate deviation value is obtained in real time. If the current discharge rate deviation value is not negative, the correction reciprocating push operation is stopped.

7. A diaphragm pumping method for liquid delivery according to claim 5, characterized in that, Methods for performing material blockage clearing operations include: Step S60: Obtain the current push frequency; Step S61: Determine the decreasing push frequency curve based on the current repeat push frequency; Step S62: Perform push frequency reduction operation based on the decreasing push frequency curve; Step S63: During the push frequency reduction operation, determine the current pressure increment of the first hydraulic chamber in real time based on the internal pressure of the first hydraulic chamber; Step S64: When there is no pressure increment inside the first hydraulic chamber, stop the push frequency reduction operation; Step S65: When there is an increasing pressure inside the first hydraulic chamber, perform a pressure relief operation.

8. The diaphragm pumping method according to claim 7, characterized in that, The methods for performing the conduction and pressure relief operation include: Step S650: Obtain the current liquid separation and conveying component number, and determine the current pressure-stabilizing check valve number based on the current liquid separation and conveying component number; Step S651: Perform a pressure relief operation based on the current pressure-regulating check valve number; Step S652: During the pressure relief operation, the pressure increment of the conducting hydraulic chamber is determined in real time based on the internal pressure of the first hydraulic chamber; Step S653: Accumulate the number of consecutive increases in the conduction pressure based on the increment value of the internal pressure of the conduction hydraulic chamber; Step S654: When the number of consecutive increases in conduction pressure exceeds the preset effective blockage number threshold, output a complete blockage signal; Step S655: Stop performing the conduction pressure relief operation when there is no longer a continuous increase in the conduction pressure.

9. A diaphragm pumping method for liquid delivery according to claim 8, characterized in that, Also includes: Step S6550: During the pressure relief operation, determine the number of the unrelieved liquid separation and delivery component based on the current pressure-stabilizing check valve number; Step S6551: Obtain the position of the reciprocating transmission mechanism corresponding to the number of the undepressurized liquid separation and conveying component in real time; Step S6552: When the reciprocating transmission mechanism is at the preset reciprocating transmission bottom position, determine the pressure at the bottom of the unrelieved hydraulic chamber in real time; Step S6553: Determine the pressure increment at the bottom of the unrelieved hydraulic chamber based on the pressure at the bottom of the unrelieved hydraulic chamber; Step S6554: When the pressure increment at the bottom of the unrelieved hydraulic chamber falls within the preset abnormal increment range, determine the number to be verified; Step S6555: Obtain the fluid replenishment signal corresponding to the number to be verified; Step S6556: When there is no liquid replenishment signal, determine the abnormal pressure stabilizing check valve number based on the number to be verified, and output the corresponding liquid discharge signal based on the abnormal pressure stabilizing check valve number.

10. A diaphragm pumping method for liquid delivery according to claim 9, characterized in that, It also includes a method for determining the abnormal pressure-stabilizing check valve number when there is no pressure increment at the bottom of the unrelieved hydraulic chamber, the method comprising: Step S6557: When there is no pressure increment at the bottom of the unrelieved hydraulic chamber, determine the number of the ungrown hydraulic chamber; Step S6558: Obtain the liquid discharge signal corresponding to the number of the ungrown hydraulic chamber; Step S6559: When a liquid discharge signal is present, determine the abnormal pressure-stabilizing check valve number based on the number of the ungrown hydraulic chamber and output it.

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