Diaphragm pump and method for transporting medium through diaphragm pump

Abstract

The invention discloses a diaphragm pump and a method for transporting media through the diaphragm pump, the diaphragm pump conveys the media by changing the volume of a pump cavity and separates the conveyed media from a driving mechanism to achieve zero-leakage conveying, the diaphragm pump comprises a pump shell, a pump cover, the driving mechanism, a diaphragm mechanism and a one-way valve mechanism, the diaphragm mechanism is driven by the driving mechanism to complete reciprocating motion so as to directly change the volume of the pump cavity, so that a circulation of sucking a medium by negative pressure and discharging the medium by positive pressure is formed, and the suction and the discharge of the medium are realized. The method is suitable for the diaphragm pump. According to the diaphragm pump, double-layer diaphragm sealing and an anti-leakage detection mechanism are adopted, double protection is formed, and the diaphragm pump is suitable for high-risk medium conveying. The multi-branch design of the pump cover is matched with multi-plunger driving, the flow is increased, and conveying is stable. The integrated eccentric shaft and multiple bearings are cooperatively limited, and the universal joint and the buffer spring are matched, so that the driving stability is improved. The liquid feeding and discharging mechanism is modularized and universal, and secondary sealing and precise spring limiting prevent backflow.

Description

Technical Field

[0001] This invention relates to the field of pump technology, and in particular to diaphragm pumps and methods for transporting media using the diaphragm pump. Background Technology

[0002] Diaphragm pumps, as positive displacement conveying devices, are widely used in industries such as chemical, petroleum, pharmaceutical, and food due to their ability to isolate the medium from the drive mechanism. They are particularly suitable for conveying corrosive, flammable, explosive, high-purity, and particulate media. In industrial production, the sealing, stability, efficiency, and equipment safety of media conveying directly affect the continuity of the production process, product quality, and the safety of the operating environment. Therefore, stringent requirements are placed on the overall performance of diaphragm pumps.

[0003] The core working principle of diaphragm pumps currently used in the industrial field is to drive a diaphragm to reciprocate, changing the pump chamber volume to create a pressure difference, thereby achieving the intake and discharge of the medium. To meet different conveying needs, existing diaphragm pumps have been continuously optimized in structural design. However, with the increasing requirements of high-end manufacturing industries for media conveying accuracy, leakage control, and equipment reliability, traditional diaphragm pumps have gradually exposed many technical shortcomings and are difficult to adapt to the demanding operating conditions.

[0004] The main problems with existing technologies are as follows: 1. Insufficient sealing performance, high risk of leakage, and limited applicability. Traditional diaphragm pumps mostly use a single-layer diaphragm structure, relying solely on the elasticity of the diaphragm itself and the sealing ring to achieve media isolation. After long-term use, media leakage is easily caused by diaphragm wear, aging, and cracking. Although some improved diaphragm pumps have added sealing structures, they lack active leakage detection and early warning mechanisms, making it impossible to detect minor leaks in time. Leaked media can easily enter the drive mechanism, causing corrosion and jamming of precision components such as bearings and eccentric shafts. This not only affects the service life of the equipment but may also cause safety accidents, making it difficult to apply to media transportation scenarios with extremely strict leakage control requirements, such as high-purity, flammable, and explosive media.

[0005] 2. Poor flow rate stability and low efficiency. Existing diaphragm pumps mostly adopt a single-channel or dual-channel medium flow channel design, coupled with a single-plunger or dual-plunger drive structure. During operation, pressure fluctuations are easily generated due to the reciprocating motion of the plunger, resulting in unstable medium flow rate and affecting the precise control of subsequent processes. At the same time, the single-channel design limits the increase in flow rate. If a larger flow rate is required, the pump body volume must be increased, resulting in increased equipment space occupation and reduced adaptability.

[0006] 3. Poor operational stability and short service life of the drive mechanism. Traditional diaphragm pumps often employ a segmented design for their eccentric shaft drive structure, connecting each shaft segment via couplings. This can easily lead to significant operational vibration and accelerated wear due to installation coaxiality errors. Furthermore, the unreasonable arrangement of the bearing housings and bearings fails to effectively balance the radial load and axial movement generated by eccentric rotation, resulting in low eccentric shaft operating accuracy and further exacerbating wear on the plunger mechanism and diaphragm. Additionally, the connection between the plunger mechanism and the eccentric shaft is often rigid, unable to compensate for angular deviations during movement, easily leading to localized stress concentration, component damage, and a shortened overall equipment service life.

[0007] 4. The one-way valve has an unreasonable structural design, resulting in poor backflow prevention and high maintenance costs. Existing diaphragm pumps often use different structural designs for their inlet and outlet valves, leading to poor component interchangeability and increased design, production, and inventory costs. The seal between the valve seat and mounting hole is often a single seal, and assembly gaps can easily cause media leakage. The spring mounting and positioning structure is imperfect, making the spring prone to misalignment and twisting, resulting in inaccurate valve opening and resetting actions, failing to achieve reliable one-way shut-off, easily causing media backflow, affecting delivery efficiency, and requiring cumbersome disassembly and maintenance after a failure, increasing operation and maintenance costs.

[0008] 5. Lack of targeted protection design, resulting in insufficient equipment safety and adaptability. Existing diaphragm pumps do not have dedicated protection and operating structures designed for media with different characteristics. The media pretreatment and residue cleaning processes are not standardized, which can easily lead to component corrosion and flow channel blockage. At the same time, the overall modularity of the equipment is low, and the sealing structure at the connection of various mechanisms is complex, making disassembly and maintenance inconvenient, further increasing the difficulty and cost of equipment operation and maintenance.

[0009] Based on the shortcomings of the existing technology, there is an urgent need for a diaphragm pump with excellent sealing performance, stable and efficient delivery, reliable drive mechanism, convenient maintenance and active leakage early warning function, so as to meet the media delivery requirements of harsh working conditions in industrial production, improve the continuity and safety of production process and reduce equipment operation and maintenance costs. Summary of the Invention

[0010] To address the aforementioned technical problems, one technical solution adopted by the present invention is a diaphragm pump. This diaphragm pump transports the medium by changing the pump chamber volume and separates the transported medium from the drive mechanism to achieve zero-leakage transport. The diaphragm pump includes: Pump casing 1 and pump cover 2; A drive mechanism 3 is used to provide power to the diaphragm pump; the drive mechanism 3 is located inside the pump housing 1. The diaphragm mechanism 4 is used to realize the intake and discharge of the medium through the reciprocating drive of the drive mechanism 3, and to prevent the medium from penetrating into the drive mechanism 3, thus protecting the normal operation of the drive mechanism 3; the diaphragm mechanism 4 is connected to the drive mechanism 3. The one-way valve mechanism 5 is used to provide a flow path for the conveying medium, guide the medium into and out of the pump chamber in a preset direction, and prevent the medium from flowing back; the one-way valve mechanism 5 is connected to the diaphragm mechanism 4; the one-way valve mechanism 5 is connected to the pump cover 2; The diaphragm mechanism 4, driven by the drive mechanism 3, completes reciprocating motion to directly change the volume of the pump chamber, forming a cycle of negative pressure intake of the medium and positive pressure discharge of the medium, thereby realizing the intake and discharge of the medium.

[0011] Furthermore, the drive mechanism 3 includes: An eccentric shaft drive structure 301 is located inside the pump housing 1; A plunger plate 302 is mounted on the pump housing 1; the telescopic end of the eccentric shaft drive structure 301 is located at the center of the plunger plate 302; the plunger plate 302 is provided with at least three plunger mounting holes 303; At least three plunger mechanisms 304 are respectively installed in corresponding plunger mounting holes 303; At least three power diaphragms 305 are respectively installed on the side of the plunger mounting hole 303 away from the eccentric shaft drive structure 301; The eccentric shaft drive structure 301 sequentially drives the plunger mechanism 304 to perform work within the plunger plate 302, pushing the power diaphragm 305 to bulge forward or retract backward.

[0012] Furthermore, the eccentric shaft drive structure 301 includes an integral eccentric shaft 3011, a rear bearing housing 3012, a middle bearing housing 3013, and a front bearing housing 3014. The integrated eccentric shaft 3011 includes a connecting part 30111 concentric with a preset motor shaft, an eccentric part 30112 located in front of the connecting part, and a plunger drive part 30113 located in front of the eccentric part 30112. The plunger drive part 30113 is concentric with the connecting part 30111. The rear bearing housing 3012 is mounted on the connecting part 30111 and a first tapered roller bearing 3015 is installed in the rear bearing housing 3012. The middle bearing housing 3013 is mounted on the eccentric part 30112 and a pair of opposite tapered roller bearings 3016 are installed in the middle bearing housing 3013. The front bearing housing 3014 is mounted on the front end of the plunger drive part 30113 and a third tapered roller bearing 3017 is installed in the front bearing housing 3014. The tapered shape of the third tapered roller bearing 3017 in the front bearing housing 3014 is opposite to the tapered shape of the first tapered roller bearing 3015 in the rear bearing housing 3012. The eccentric part 30112 has an external thread in front of the central bearing seat 3013, and a locking nut 3018 is installed on the external thread.

[0013] Furthermore, each of the plunger mechanisms 304 includes a plunger outer cylinder 3041, a plunger inner core 3042, and a universal joint 3043. The plunger outer cylinder 3041 is located inside the corresponding plunger plate 302, and a buffer spring 3044 is installed inside the plunger plate 302. The plunger inner core 3042 is fixedly installed on the upper part of the plunger outer cylinder 3041, and the power diaphragm 305 is fixedly installed on the top of the plunger inner core 3042, with its outer edge sealed and fixed to the plunger plate 302. The plunger outer cylinder 3041 has a universal joint clearance groove 3045 at the middle of its rear end. The universal joint 3043 is installed in the universal joint clearance groove 3045 by a snap ring 3046 installed in the universal joint clearance groove 3045.

[0014] Furthermore, the diaphragm mechanism 4 includes: The diaphragm mounting plate 401 is provided with at least three center point misaligned stepped holes 402; the center point misaligned stepped holes 402 are provided with liquid receiving diaphragm relief grooves 403 on the side near the one-way valve mechanism 5. At least three liquid-receiving diaphragms 404 are located within corresponding liquid-receiving diaphragm clearance grooves 403; At least three diaphragm plates 405 are provided, wherein the liquid-receiving diaphragm 404 is installed in the liquid-receiving diaphragm relief groove 403 by means of the diaphragm plates 405 installed in the liquid-receiving diaphragm relief groove 403; the diaphragm plates 405 are provided with sealing ring mounting grooves 406. At least three diaphragm plate sealing rings 407 are located within the sealing ring mounting grooves 406.

[0015] Furthermore, the one-way valve mechanism 5 includes: a one-way valve mounting plate 501, which is used to support all the components of the one-way valve; the one-way valve mounting plate 501 is provided with at least three liquid inlet holes and three liquid outlet holes; At least three liquid inlet mechanisms 502 are used to input liquid into the diaphragm pump through the reciprocating motion of the diaphragm pump; each of the liquid inlet mechanisms 502 is installed in a corresponding liquid inlet port; At least three liquid discharge mechanisms 503 are used to discharge liquid from the diaphragm pump to the outside of the diaphragm pump by means of the reciprocating motion of the diaphragm pump; each of the liquid discharge mechanisms 503 is installed in a corresponding liquid discharge port; The liquid inlet mechanism 502 and the liquid outlet mechanism 503 have the same structure; the liquid inlet mechanism 502 is arranged in the direction of liquid input into the diaphragm pump; the liquid outlet mechanism 503 is arranged in the direction of liquid output to the outside of the diaphragm pump. Both the liquid inlet mechanism 502 and the liquid outlet mechanism 503 include: a valve seat 504, which is installed in or inside the liquid inlet hole; a sealing ring 505 is provided between the valve seat 504 and the liquid inlet hole or the inner wall of the liquid inlet hole, the sealing ring 505 is used to fill the assembly gap between the valve seat 504 and the hole wall, to prevent liquid from leaking from the gap between the valve seat 504 and the hole wall, forming a secondary sealing protection; Valve plate 506 is located in the central circular hole of valve seat 504; the side surface of valve plate 506 is the sealing surface of valve seat 504; A cross spring mounting base 507 is connected to the bottom surface of the valve seat 504 at its four corners; a spring mounting space is formed between the valve seat 504 and the cross spring mounting base 507. Spring 508 is installed in spring mounting space; one end of spring 508 is connected to the surface of valve plate 506, and the other end is connected to the inner surface of cross spring mounting seat 507. The spring force of the spring 508 applies a force to the valve plate 506 pointing towards the valve seat 504, pushing the side surface of the valve plate 506 to tightly fit the sealing surface of the central circular hole of the valve seat 504. When liquid enters or exits the diaphragm pump, the fluid pressure acts on the side of the valve plate 506 away from the valve seat 504, forming a thrust opposite to the elastic force of the spring 508. As the fluid pressure gradually increases, when the thrust exceeds the sum of the elastic force of the spring 508 and the frictional force of the sealing surface, the valve plate 506 begins to overcome the spring resistance and moves away from the valve seat 504. The central circular hole of the valve seat 504 is opened, and the liquid flows through the gap between the valve plate 506 and the valve seat 504 along the central hole of the valve seat 504, completing the liquid inlet or outlet. When the fluid pressure weakens, disappears, or reverse fluid pressure appears, the elastic force of the spring 508 is greater than the fluid pressure, pushing the valve plate 506 to return to the valve seat 504 until the valve plate tightly fits the sealing surface of the central hole of the valve seat again, completing the sealing of the channel and stopping the liquid inlet or outlet action. If there is reverse fluid pressure, this pressure will be superimposed on the elastic force of the spring 508, further enhancing the sealing degree between the valve plate and the valve seat, and achieving one-way shut-off of the liquid.

[0016] Furthermore, the pump cover 2 is provided with a main water inlet 201, a water inlet guide channel 202, a main water outlet 203, and a water outlet guide channel 204; the water inlet guide channel 202 is provided with at least three liquid inlet mechanism clearance holes 205; the water outlet guide channel 204 is provided with at least three liquid outlet mechanism clearance holes 206. After entering from the main inlet 201, the medium is divided into at least three branches by the inlet guide channel 202 and flows into the liquid inlet mechanism 502, and then enters the diaphragm pump. The medium in the diaphragm pump is collected by at least three liquid outlet mechanisms 503 and then flows into the liquid outlet guide channel 204, and then leaves the diaphragm pump from the main outlet 203. The one-way valve mounting plate 501 is mounted on the pump cover 2 by a locking element provided at the edge; Furthermore, the diaphragm pump also includes a leak detection mechanism 6, which is located between the drive mechanism 3 and the diaphragm mechanism 4. The leak detection mechanism 6 is used to detect the integrity of the diaphragm and the leakage of the medium. When the diaphragm is damaged or aged, causing the medium to permeate, the leak signal is captured and an alarm or shutdown command is triggered, which further increases the zero-leakage function of the diaphragm pump and avoids corrosion and damage to the drive mechanism 3 caused by the leaking medium.

[0017] Furthermore, the leak detection mechanism 6 includes: At least three sensor mounting holes 601 are formed on the side surface of the diaphragm mounting plate 401 and communicate with the corresponding center point misaligned stepped holes 402. At least three sensors are inserted into corresponding sensor mounting holes 601; the detection end of the sensor is located in the center point misaligned stepped hole 402.

[0018] Another technical solution adopted by the present invention is: a method for transporting media using the diaphragm pump, the method being applicable to the aforementioned diaphragm pump, the method comprising: S1. Check the integrity of the assembly of each component of the diaphragm pump, and confirm that the drive mechanism 3, diaphragm mechanism 4, check valve mechanism 5 and anti-leakage detection mechanism 6 are reliably connected, and that the diaphragm pressure plate sealing ring 407 and valve seat sealing ring 505 are installed in place and without damage; connect the medium to be transported to the main inlet 201 of the pump cover 2, and ensure that the medium is free of impurities and the viscosity meets the pump body's operating requirements. At the same time, start the anti-leakage detection mechanism 6 to put each sensor into working state and monitor the integrity of the diaphragm and leakage in real time. S2. Start the motor connected to the integrated eccentric shaft 30111 connecting part 30111. The motor drives the integrated eccentric shaft 3011 to rotate. The tapered roller bearings in the rear bearing housing 3012, the middle bearing housing 3013 and the front bearing housing 3014 are precisely positioned to ensure stable operation of the eccentric shaft. The eccentric part 30112 of the eccentric shaft is locked in position by the locking nut 3018, which drives the plunger drive part 30113 to make eccentric movement, thereby driving the telescopic end at the center of the plunger plate 302, so that the eccentric shaft drive structure 301 acts sequentially on at least three plunger mechanisms 304 on the plunger plate 302. S3, the plunger mechanism 304 performs work within the plunger mounting hole 303, pushing the power diaphragm 305 on the side away from the eccentric shaft drive structure 301 to reciprocate; when the power diaphragm 305 protrudes forward, it drives the liquid-receiving diaphragm 404 of the diaphragm mechanism 4 to move synchronously, reducing the corresponding pump chamber volume and forming positive pressure; when the power diaphragm 305 retracts backward, the pump chamber volume increases, forming negative pressure; during this process, the buffer spring 3044 assists the plunger outer cylinder 3041 and the plunger inner core 3042 to reset, and the universal joint 3043 adapts to the movement angle of the plunger mechanism to ensure smooth power transmission; S4. When a negative pressure is formed in the pump chamber, the valve plate 506 of the inlet mechanism 502, under the action of the medium pressure, overcomes the elastic force of the spring 508 and the friction of the sealing surface, and moves away from the valve seat 504, opening the central circular hole channel of the valve seat. The medium flows from the main inlet 201 into the inlet guide groove 202, and is divided into at least three branches through the clearance hole 205 of the inlet mechanism. It enters the pump chamber through the opened inlet mechanism 502, completing the liquid suction action. When a positive pressure is formed in the pump chamber, the valve plate 506 of the inlet mechanism 502 is reset under the action of the spring 508, tightly fitting the sealing surface of the valve seat to block the inlet channel. At the same time, the positive pressure pushes the valve plate 506 of the outlet mechanism 503 to open, and the medium in the pump chamber flows into the outlet guide groove 204 through the outlet mechanism 503, and is discharged from the main outlet 203 after being collected, completing the liquid discharge action. The cross spring mounting seat 507 limits the spring 508 to ensure accurate valve plate movement and prevent medium backflow. S5. During the entire process of media transportation, the sensor of the leak detection mechanism 6 detects the situation inside the misaligned stepped hole 402 at the center point through the sensor mounting hole 601. If the liquid-contacting diaphragm 404 or the power diaphragm 305 is damaged or aged, causing media to seep in, the sensor captures the leakage signal and immediately triggers an alarm or shutdown command to prevent the leaking medium from corroding the drive mechanism 3 and ensure equipment safety. S6. After the medium is transported, the motor is turned off, the drive mechanism stops running, the diaphragm returns to its initial state under the action of the spring reset, and all the valve plates of the one-way valve mechanism 5 are reset to block the channel; the medium source and the main outlet 203 are closed, the residual medium in the pump chamber and the guide channel is cleaned, the leak detection mechanism 6 is turned off, and the entire transport process is completed.

[0019] Compared with the prior art, the present invention has the following advantages: The diaphragm pump adopts a double-layer sealed isolation structure of dynamic diaphragm + liquid-receiving diaphragm, which completely separates the conveyed medium from the drive mechanism, thus structurally preventing medium leakage; at the same time, a leakage detection mechanism is added, which monitors the medium permeation in the diaphragm bonding area in real time through sensors, and can trigger an alarm or shutdown command in the early stage of diaphragm damage or aging, forming a dual protection system of structural sealing and active early warning, which can safely convey corrosive, flammable and explosive, high-purity and other media with strict requirements for leakage control.

[0020] The pump cover integrates multiple branch flow guide grooves and multiple sets of inlet / outlet liquid mechanisms. With the synchronous drive of at least three plunger mechanisms, it realizes parallel diversion and convergence of the medium. Compared with the single-channel conveying structure, it effectively improves the overall conveying flow of the pump body. At the same time, the periodic alternating work of multiple plungers can offset the pressure fluctuations caused by the movement of a single plunger, ensure the stability of the medium conveying process, and reduce pipeline impact loss.

[0021] The drive mechanism adopts an integrated eccentric shaft and multi-bearing housing positioning structure design. Through the coordinated positioning of tapered roller bearings in the rear, middle and front bearing housings, especially the reverse tapered arrangement of the front and rear bearings, it can effectively balance the axial movement and radial load generated by the rotation of the eccentric shaft, reducing vibration and wear. The universal joint equipped with the plunger mechanism can compensate for installation coaxiality errors, and the buffer spring can reduce the impact of reciprocating motion, further improving the operating stability of the drive mechanism and extending the service life of the equipment.

[0022] The inlet and outlet mechanisms adopt the same modular structure, and the unidirectional flow function is achieved only by adjusting the installation direction, which greatly reduces the design, production and inventory costs of the parts; the sealing ring between the valve seat and the orifice wall forms a secondary sealing protection, and the cross spring mounting seat precisely limits the spring, ensuring the controllability of the valve plate opening and resetting action, effectively preventing the backflow of the medium and improving the reliability of the unidirectional seal. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the diaphragm pump of the present invention.

[0024] Figure 2 This is a schematic diagram of the pump cover.

[0025] Figure 3 This is a 3D view of the pump cover.

[0026] Figure 4 This is a schematic diagram of the drive mechanism.

[0027] Figure 5 for Figure 4 Side view.

[0028] Figure 6 for Figure 5 A sectional view of AA.

[0029] Figure 7 This is a schematic diagram of the eccentric shaft drive structure.

[0030] Figure 8 for Figure 7 Side view.

[0031] Figure 9 for Figure 8 A cross-sectional view of BB.

[0032] Figure 10 This is a schematic diagram of the structure of an integrated eccentric shaft.

[0033] Figure 11 This is a side view of an integrated eccentric shaft.

[0034] Figure 12 This is a schematic diagram of the plunger mechanism.

[0035] Figure 13 for Figure 12 Side view.

[0036] Figure 14 for Figure 13 A cross-sectional view of CC.

[0037] Figure 15 This is a schematic diagram of the diaphragm mechanism.

[0038] Figure 16 for Figure 15 Side view.

[0039] Figure 17 for Figure 16 A sectional view of DD.

[0040] Figure 18 This is a schematic diagram of a one-way valve mechanism.

[0041] Figure 19 This is a schematic diagram of the liquid inlet or liquid outlet mechanism.

[0042] Figure 20 for Figure 19 Side view.

[0043] The components include: 1. Pump casing; 2. Pump cover; 201. Main inlet; 202. Inlet guide channel; 203. Main outlet; 204. Outlet guide channel; 205. Liquid inlet mechanism clearance hole; 206. Liquid outlet mechanism clearance hole; 3. Drive mechanism; 301. Eccentric shaft drive structure; 3011. Integrated eccentric shaft; 30111. Connecting part; 30112. Eccentric part; 30113. Plunger drive part; 3012. Rear bearing housing; 3013. Middle bearing housing; 3014. Front bearing housing; 3015. First tapered roller bearing; 3016. Second tapered roller bearing; 3017. Third tapered roller bearing; 302. Plunger plate; 303. Plunger mounting hole; 304. Plunger mechanism; 3041. 3042. Plunger outer cylinder; 3043. Plunger inner core; 3044. Universal joint; 3045. Buffer spring; 3046. Universal joint clearance groove; 3047. Snap ring; 305. Power diaphragm; 4. Diaphragm mechanism; 401. Diaphragm mounting plate; 402. Center point misalignment stepped hole; 403. Liquid receiving diaphragm clearance groove; 404. Liquid receiving diaphragm; 405. Diaphragm pressing plate; 406. Sealing ring mounting groove; 407. Diaphragm pressing plate sealing ring; 5. One-way valve mechanism; 501. One-way valve mounting plate; 502. Liquid inlet mechanism; 503. Liquid outlet mechanism; 504. Valve seat; 505. Sealing ring; 506. Valve plate; 507. Cross spring mounting seat; 508. Spring; 6. Leakage prevention detection mechanism; 601. Sensor mounting hole. Detailed Implementation

[0044] The technical solutions of the diaphragm pump and the method for transporting media using the diaphragm pump provided by the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045] Example 1 like Figures 1-20 As shown, this is a diaphragm pump. This pump delivers media by changing the pump chamber volume and isolates the delivered media from the drive mechanism, achieving zero-leakage delivery. Specifically, the diaphragm pump generates a pressure difference by periodically changing the internal volume of the pump chamber, achieving stable media delivery. Simultaneously, thanks to its unique diaphragm separation design, the delivered media is completely isolated from the power drive mechanism, structurally eliminating media leakage. It is widely applicable to media delivery scenarios with stringent leakage control requirements, such as those involving corrosive, flammable, explosive, or high-purity media.

[0046] The diaphragm pump includes: pump casing 1 and pump cover 2.

[0047] Furthermore, the pump cover 2 is provided with a main inlet 201, an inlet guide channel 202, a main outlet 203, and an outlet guide channel 204; the inlet guide channel 202 is provided with at least three liquid inlet mechanism clearance holes 205; the outlet guide channel 204 is provided with at least three liquid outlet mechanism clearance holes 206. After the medium enters from the main inlet 201, it is divided into at least three branches by the inlet guide channel 202 and flows into the liquid inlet mechanism 502 before entering the diaphragm pump; the medium in the diaphragm pump is collected by the at least three liquid outlet mechanisms 503 and then flows into the outlet guide channel 204 before leaving the diaphragm pump from the main outlet 203.

[0048] Specifically, the pump cover 2, serving as a channel for the inlet and outlet of the medium, integrates a main inlet 201, an inlet guide channel 202, a main outlet 203, and an outlet guide channel 204. These channels work together to achieve the diversion and convergence of the medium. The main inlet 201 and main outlet 203 are located at corresponding ends of the pump cover 2, facilitating connection with external pipelines. The inlet guide channel 202 and outlet guide channel 204 are embedded in the side of the pump cover 2 facing the diaphragm mechanism 4, forming a concealed flow channel. This reduces the resistance to medium flow while ensuring the integrity of the pump cover structure. To accommodate the installation and docking of multiple sets of inlet and outlet mechanisms, at least three inlet mechanism clearance holes 205 are evenly opened on the inlet guide channel 202, and at least three outlet mechanism clearance holes 206 are correspondingly opened on the outlet guide channel 204. The number of clearance holes is consistent with the number of subsequent inlet and outlet mechanisms and plunger mechanisms, ensuring that each power unit can correspond to an independent medium channel.

[0049] Under pipeline pressure or pump body negative pressure, the external medium enters the pump cover 2 from the main inlet 201. Through the diversion effect of the inlet guide channel 202, it is evenly divided into at least three branches, which flow into each group of inlet mechanisms 502 through the corresponding inlet clearance holes 205. The inlet mechanisms 502 then guide the medium to the corresponding pump chamber of the diaphragm pump. After the medium is pressurized in the pump chamber, it is discharged through each group of outlet mechanisms 503, finally converging into the outlet guide channel 204 for centralized convergence, and finally exiting the pump body from the main outlet 203, completing one complete medium transport cycle. This multi-branch parallel transport design effectively increases the pump's transport flow rate while ensuring the stability of medium transport, avoiding the flow fluctuation problems that may occur with single-channel transport.

[0050] The diaphragm pump also includes a drive mechanism 3, which provides power to the diaphragm pump; the drive mechanism 3 is located inside the pump housing 1.

[0051] In this embodiment, the function of the drive mechanism 3 is to provide continuous and stable power output for the change of pump cavity volume. The drive mechanism 3 is integrated and installed inside the pump housing 1. The pump housing 1 provides sealing protection to prevent external dust and impurities from entering, and at the same time prevents internal lubricating oil leakage.

[0052] Furthermore, the drive mechanism 3 includes an eccentric shaft drive structure 301, which is located inside the pump housing 1. Specifically, the eccentric shaft drive structure 301 serves as the power output core, and is arranged laterally inside the pump housing 1, providing rotational power to the entire drive mechanism and converting it into reciprocating linear motion.

[0053] Furthermore, the eccentric shaft drive structure 301 includes an integral eccentric shaft 3011, a rear bearing housing 3012, a middle bearing housing 3013, and a front bearing housing 3014. Specifically, to improve the stability and service life of the drive mechanism, the eccentric shaft drive structure 301 adopts an integral structure design, achieving precise rotation of the eccentric shaft through multi-bearing housing positioning, thereby reducing vibration and wear.

[0054] The integrated eccentric shaft 3011 includes a connecting part 30111 concentric with a preset motor shaft, an eccentric part 30112 located in front of the connecting part, and a plunger drive part 30113 located in front of the eccentric part 30112. The plunger drive part 30113 is concentric with the connecting part 30111. Specifically, the shaft of the integrated eccentric shaft 3011 is divided into three functional sections: the connecting part 30111, concentric with the preset motor shaft, is used to fix and connect to the output shaft of an external drive motor to transmit rotational power. The eccentric part 30112, located in front of the connecting part, has a preset eccentricity between its axis and the axis of the connecting part, and is the core structure for converting rotational motion into reciprocating linear motion. The plunger drive part 30113, located in front of the eccentric part 30112, has its axis concentric with the axis of the connecting part 30111, and is used to cooperate with the front bearing seat to achieve end positioning.

[0055] The rear bearing housing 3012 is mounted on the connecting part 30111, and a first tapered roller bearing 3015 is installed inside the rear bearing housing 3012. The middle bearing housing 3013 is mounted on the eccentric part 30112, and a pair of opposing tapered roller bearings 3016 are installed inside the middle bearing housing 3013. The front bearing housing 3014 is mounted on the front end of the plunger drive part 30113, and a third tapered roller bearing 3017 is installed inside the front bearing housing 3014. The tapered shape of the third tapered roller bearing 3017 in the front bearing housing 3014 is opposite to that of the first tapered roller bearing 3015 in the rear bearing housing 3012. The eccentric part 30112 has an external thread in front of the middle bearing housing 3013, and a lock nut 3018 is installed on the external thread.

[0056] Specifically, each bearing housing is installed in a different functional section of the integrated eccentric shaft 3011 to achieve full-stroke positioning support: the rear bearing housing 3012 is fixedly fitted onto the connecting part 30111, and a first tapered roller bearing 3015 is installed inside, mainly bearing radial and axial forces to ensure stable rotation of the connecting part; the middle bearing housing 3013 is fitted onto the eccentric part 30112, and a pair of tapered roller bearings 3016 arranged opposite each other are installed inside, which can effectively counteract the radial load and bidirectional axial force generated by eccentric rotation and prevent offset when the eccentric part rotates; the front bearing housing 3014 is installed at the front end of the plunger drive part 30113, and a third tapered roller bearing 3017 is installed inside, which is used to achieve positioning support for the front end of the eccentric shaft and further improve the overall rotational stability. Meanwhile, the tapered direction of the third tapered roller bearing 3017 in the front bearing housing 3014 is opposite to that of the first tapered roller bearing 3015 in the rear bearing housing 3012. This reverse arrangement can form a bidirectional axial limit, effectively balancing the axial movement generated during the rotation of the eccentric shaft and improving the stability of the mechanism. In addition, the eccentric part 30112 has an external thread machined on the outer circumferential surface in front of the middle bearing housing 3013. A locking nut 3018 is installed on this external thread. Through the tightening action of the locking nut 3018, the middle bearing housing 3013 and the eccentric part 30112 can be fixed relative to each other, preventing the bearing housing from shifting axially and ensuring the installation accuracy of the bearing.

[0057] The drive mechanism 3 further includes: a plunger plate 302, which is mounted on the pump housing 1; the telescopic end of the eccentric shaft drive structure 301 is located at the center of the plunger plate 302; and the plunger plate 302 is provided with at least three plunger mounting holes 303.

[0058] Specifically, the plunger plate 302 is fixedly mounted on the end face of the pump housing 1 facing the diaphragm mechanism 4 using bolts and other connecting parts, forming an installation transition carrier between the drive mechanism and the diaphragm mechanism. The telescopic power output end of the eccentric shaft drive structure 301 is precisely positioned and connected to the center position of the plunger plate 302 to ensure the coaxiality of power transmission and avoid component wear caused by eccentric force. To accommodate the installation of multiple plunger mechanisms, at least three plunger mounting holes 303 are evenly opened along the circumferential direction on the plunger plate 302. The diameter of the mounting holes matches the outer diameter of the plunger mechanism 304 to ensure the coaxiality and sealing of the plunger mechanism after installation.

[0059] The drive mechanism 3 further includes at least three plunger mechanisms 304, which are respectively installed in the corresponding plunger mounting holes 303.

[0060] Furthermore, each of the plunger mechanisms 304 includes a plunger outer cylinder 3041, a plunger inner core 3042, and a universal joint 3043. The plunger outer cylinder 3041 is located within a corresponding plunger plate 302, and a buffer spring 3044 is installed within the plunger plate 302. The plunger inner core 3042 is fixedly installed on the upper part of the plunger outer cylinder 3041, and the power diaphragm 305 is fixedly installed on the top of the plunger inner core 3042, with its outer edge sealed and fixed to the plunger plate 302. A universal joint clearance groove 3045 is provided at the middle of the rear end of the plunger outer cylinder 3041, and the universal joint 3043 is installed within the universal joint clearance groove 3045 by a retaining ring 3046 installed within the universal joint clearance groove 3045.

[0061] Specifically, each plunger mechanism 304 adopts a modular design for easy disassembly and maintenance, including the plunger outer cylinder 3041, the plunger inner core 3042, and the universal joint 3043. The plunger outer cylinder 3041 is a hollow cylindrical structure that fits into the plunger mounting hole 303 of the corresponding plunger plate 302. A buffer spring 3044 is installed between the plunger mounting hole 303 and the plunger outer cylinder 3041. The buffer spring 3044 can buffer and dampen the reciprocating motion of the plunger mechanism, reduce the impact of the motion, and assist the plunger mechanism in resetting, thereby improving the smoothness of the motion. The plunger inner core 3042 is fixedly installed on the upper part of the plunger outer cylinder 3041 by a sliding fit and can reciprocate synchronously with the plunger outer cylinder 3041. The center position of the power diaphragm 305 is fixedly installed on the top of the plunger inner core 3042, and the outer edge of the power diaphragm 305 is sealed and fixed to the plunger plate 302 through a sealing structure to ensure the sealing of the pump cavity when the power diaphragm moves, and at the same time completely isolate the medium from the plunger mechanism.

[0062] To achieve a flexible connection between the plunger mechanism and the eccentric shaft drive structure, a universal joint clearance groove 3045 is provided in the middle of the rear end of the plunger outer cylinder 3041. The universal joint 3043 is detachably installed in the universal joint clearance groove 3045 via a snap ring 3046. The snap ring 3046 can limit the axial displacement of the universal joint 3043 and prevent it from falling off. The universal joint 3043 can compensate for the installation coaxiality error between the eccentric shaft drive structure and the plunger mechanism, so that the rotational power of the eccentric shaft can be smoothly transmitted to the plunger mechanism, reducing the wear of the plunger mechanism caused by eccentric force and extending its service life.

[0063] The drive mechanism 3 further includes at least three power diaphragms 305, which are respectively installed on the side of the plunger mounting hole 303 away from the eccentric shaft drive structure 301. The eccentric shaft drive structure 301 sequentially drives the plunger mechanism 304 to do work in the plunger plate 302, pushing the power diaphragms 305 to bulge forward or retract backward.

[0064] In this embodiment, each plunger mechanism 304 is installed in the plunger mounting hole 303 of the plunger plate 302 and can reciprocate linearly along the axial direction of the mounting hole. At least three power diaphragms 305 are respectively fixedly installed on the side end face of the plunger mounting hole 303 away from the eccentric shaft drive structure 301, and their edges are sealed and fixed to the plunger plate 302 by sealing rings to form a sealing isolation surface of the pump cavity. When the eccentric shaft drive structure 301 is working, it drives each group of plunger mechanisms 304 to reciprocate within the plunger mounting hole 303 through its own eccentric rotational motion. When the plunger mechanism 304 extends forward, it pushes the power diaphragm 305 to bulge towards one side of the pump cavity, reducing the volume of the corresponding pump cavity and generating positive pressure to discharge the medium. When the plunger mechanism 304 retracts backward, the power diaphragm 305 retracts backward under its own elasticity and the negative pressure of the pump cavity, increasing the volume of the pump cavity and forming negative pressure to draw in the medium. Through this periodic reciprocating motion, the continuous delivery of the medium is achieved.

[0065] The diaphragm pump also includes a diaphragm mechanism 4, which is used to achieve the intake and discharge of the medium through the reciprocating drive of the drive mechanism 3, and to prevent the medium from penetrating into the drive mechanism 3, thus protecting the normal operation of the drive mechanism 3; the diaphragm mechanism 4 is connected to the drive mechanism 3. Specifically, the diaphragm mechanism 4, in conjunction with the reciprocating drive action of the drive mechanism 3, realizes the change of pump chamber volume to complete the intake and discharge of the medium, and at the same time, with its own sealing performance, completely prevents the conveyed medium from penetrating into the interior of the drive mechanism 3, avoiding corrosion and wear of the drive mechanism by the medium, and ensuring the normal and stable operation of the drive mechanism. The diaphragm mechanism 4 is tightly fitted and connected to the power diaphragm 305 of the drive mechanism 3, and also docks with the one-way valve mechanism 5 to form a closed pump chamber structure.

[0066] Furthermore, the diaphragm mechanism 4 includes: a diaphragm mounting plate 401, which has at least three center-point staggered stepped holes 402; the center-point staggered stepped holes 402 have liquid-receiving diaphragm clearance grooves 403 on the side near the one-way valve mechanism 5. The diaphragm mounting plate 401 serves as the mounting base for the diaphragm mechanism and is fixedly connected to the pump cover 2 and the one-way valve mechanism 5 by locking components. At least three center-point staggered stepped holes 402 are evenly provided along the circumferential direction on the plate. The structural design of the stepped holes provides layered installation space for the liquid-receiving diaphragm 404 and the diaphragm plate 405, while ensuring coaxiality after installation. Each center-point staggered stepped hole 402 has an annular liquid-receiving diaphragm clearance groove 403 on the side near the one-way valve mechanism 5. The size of the clearance groove matches the outer diameter of the liquid-receiving diaphragm 404 and is used to accommodate the liquid-receiving diaphragm 404.

[0067] The diaphragm mechanism 4 further includes at least three liquid-receiving diaphragms 404, which are located in corresponding liquid-receiving diaphragm clearance grooves 403.

[0068] Specifically, at least three liquid-receiving diaphragms 404 are placed one-to-one in the liquid-receiving diaphragm relief groove 403. The liquid-receiving diaphragms 404 are made of corrosion-resistant and highly elastic polymer materials, which can withstand the corrosion of the medium and can also undergo elastic deformation under the drive of the power diaphragm to realize the change of pump cavity volume.

[0069] The diaphragm mechanism 4 further includes: at least three diaphragm plates 405, wherein the liquid-receiving diaphragm 404 is installed in the liquid-receiving diaphragm clearance groove 403 by means of the diaphragm plates 405 installed in the liquid-receiving diaphragm clearance groove 403; the diaphragm plates 405 are provided with sealing ring mounting grooves 406.

[0070] Specifically, at least three diaphragm plates 405 are used to press and fix the liquid-receiving diaphragm 404 into the liquid-receiving diaphragm relief groove 403 to prevent the liquid-receiving diaphragm from shifting or deforming excessively during operation. Each diaphragm plate 405 is provided with a sealing ring mounting groove 406, and the diaphragm plate sealing ring 407 is installed in the corresponding sealing ring mounting groove 406.

[0071] The diaphragm mechanism 4 further includes at least three diaphragm pressing sealing rings 407, which are located in the sealing ring mounting groove 406.

[0072] Specifically, after the diaphragm plate 405 is pressed, the diaphragm plate sealing ring 407 can fill the gap between the diaphragm plate and the liquid-contacting diaphragm, further enhancing the sealing of the pump cavity and preventing the medium from leaking from the installation gap.

[0073] The diaphragm pump also includes: a one-way valve mechanism 5, which provides a flow path for the conveyed medium, guides the medium to enter and exit the pump chamber in a preset direction, and avoids backflow of the medium; the one-way valve mechanism 5 is connected to the diaphragm mechanism 4; the one-way valve mechanism 5 is connected to the pump cover 2; wherein, the diaphragm mechanism 4 completes reciprocating motion through the drive mechanism 3 to directly change the volume of the pump chamber, forming a cycle of negative pressure intake of the medium and positive pressure discharge of the medium, thereby realizing the intake and discharge of the medium.

[0074] Specifically, the one-way valve mechanism 5 serves as the core of media flow control, providing a directional flow path for the transported media, precisely guiding the media into and out of the pump chamber in a preset direction, while effectively preventing backflow and ensuring the unidirectionality and stability of media transport. One end of the one-way valve mechanism 5 is tightly connected to the diaphragm mechanism 4, and the other end is correspondingly connected to the inlet and outlet water guide grooves of the pump cover 2. Multiple sealing structures ensure the sealing of the connection. The diaphragm mechanism 4 completes periodic reciprocating motion through the reciprocating drive of the drive mechanism 3, directly changing the volume of the corresponding pump chamber, thereby forming a cycle of negative pressure intake and positive pressure discharge of the media, realizing continuous media transport.

[0075] Furthermore, the one-way valve mechanism 5 includes a one-way valve mounting plate 501, which supports all components of the one-way valve. The one-way valve mounting plate 501 has at least three inlet holes and three outlet holes. Specifically, the one-way valve mounting plate 501 is a rectangular or circular flat plate structure made of high-strength pressure-resistant material, used to support all components of the one-way valve. At least three inlet holes and three outlet holes are correspondingly opened along the circumferential direction on the plate. The inlet holes are connected to the inlet mechanism clearance hole 205 of the pump cover 2 and the center hole of the liquid receiving diaphragm 404, while the outlet holes are connected to the outlet mechanism clearance hole 206 of the pump cover 2 and the center hole of the liquid receiving diaphragm 404, forming a complete media channel.

[0076] The one-way valve mechanism 5 further includes at least three liquid inlet mechanisms 502, which are used to input liquid into the diaphragm pump through the reciprocating motion of the diaphragm pump; each of the liquid inlet mechanisms 502 is installed in a corresponding liquid inlet hole.

[0077] The one-way valve mechanism 5 further includes at least three liquid outlet mechanisms 503, which are used to output liquid from the diaphragm pump to the outside of the diaphragm pump through the reciprocating motion of the diaphragm pump; each liquid outlet mechanism 503 is installed in a corresponding liquid outlet hole. The liquid inlet mechanism 502 and the liquid outlet mechanism 503 have the same structure; the liquid inlet mechanism 502 is arranged in the direction of liquid input into the diaphragm pump; the liquid outlet mechanism 503 is arranged in the direction of liquid output to the outside of the diaphragm pump.

[0078] Specifically, at least three inlet mechanisms 502 are installed one-to-one in the inlet holes of the one-way valve mounting plate 501. Their function is to control the entry of the medium into the pump chamber through the reciprocating motion of the diaphragm pump, preventing backflow of the medium. At least three outlet mechanisms 503 are installed one-to-one in the outlet holes of the one-way valve mounting plate 501 to control the discharge of the medium from the pump chamber, also providing anti-backflow functionality. To simplify the structure and reduce manufacturing costs, the inlet mechanisms 502 and outlet mechanisms 503 adopt identical structural designs, differing only in their installation direction: the inlet mechanisms 502 are positioned forward along the direction of medium input into the pump chamber, while the outlet mechanisms 503 are positioned in the reverse direction along the direction of medium output from the pump chamber. The unidirectional flow guidance function is achieved by adjusting the installation direction.

[0079] Furthermore, both the liquid inlet mechanism 502 and the liquid outlet mechanism 503 include: a valve seat 504, which is installed in or inside the liquid inlet hole; a sealing ring 505 is provided between the valve seat 504 and the liquid inlet hole or the inner wall of the liquid inlet hole, the sealing ring 505 is used to fill the assembly gap between the valve seat 504 and the hole wall, to prevent liquid from leaking from the gap between the valve seat 504 and the hole wall, forming a secondary sealing protection.

[0080] Specifically, the valve seat 504 has a stepped annular structure that is tightly embedded in the inlet or outlet hole of the one-way valve mounting plate 501. A sealing ring 505 is fitted between the valve seat 504 and the hole wall. The sealing ring 505 is made of an elastic material that is resistant to media corrosion. It can effectively fill the assembly gap between the valve seat 504 and the hole wall, forming a secondary sealing protection, further preventing the media from leaking from the gap between the valve seat and the hole wall, and improving the overall sealing reliability.

[0081] Both the liquid inlet mechanism 502 and the liquid outlet mechanism 503 further include: a valve plate 506, which is located in the central circular hole of the valve seat 504; the side surface of the valve plate 506 and the sealing surface of the valve seat 504.

[0082] Specifically, the valve plate 506 is made of flexible sealing material and is fitted into the central circular hole of the valve seat 504. The side surface of the valve plate 506 is in contact with the inner wall sealing surface of the central circular hole of the valve seat 504 to form an initial sealing state and block the flow of media.

[0083] Both the liquid inlet mechanism 502 and the liquid outlet mechanism 503 include a cross spring mounting base 507, the four corners of which are connected to the bottom surface of the valve seat 504; a spring mounting space is formed between the valve seat 504 and the cross spring mounting base 507.

[0084] Specifically, the cross spring mounting base 507 is a cross-shaped bracket structure, and its four corners are fixedly connected to the bottom surface of the valve seat 504 by bolts or clips, so that a stable spring mounting space is formed between the valve seat 504 and the cross spring mounting base 507.

[0085] Both the liquid inlet mechanism 502 and the liquid outlet mechanism 503 further include a spring 508, which is installed within the spring mounting space. One end of the spring 508 is connected to the surface of the valve plate 506, and the other end is connected to the inner surface of the cross spring mounting seat 507. The spring force of the spring 508 applies a force towards the valve seat 504 to the valve plate 506, pushing the side surface of the valve plate 506 to tightly conform to the sealing surface of the central circular hole of the valve seat 504.

[0086] Specifically, spring 508 is installed in the spring mounting space. One end of spring 508 is tightly connected to the side surface of valve plate 506 away from valve seat, and the other end is fixedly connected to the inner surface of cross spring mounting base 507. In its natural state, spring 508 is in a compressed state and applies a force to valve plate 506 pointing towards valve seat 504 through its own elasticity, pushing the side surface of valve plate 506 to tightly fit the sealing surface of the central circular hole of valve seat 504, keeping the channel closed.

[0087] When liquid enters or exits the diaphragm pump, the fluid pressure acts on the side of the valve plate 506 away from the valve seat 504, forming a thrust opposite to the elastic force of the spring 508. As the fluid pressure gradually increases, when this thrust exceeds the sum of the elastic force of the spring 508 and the frictional force of the sealing surface, the valve plate 506 begins to overcome the spring resistance and moves away from the valve seat 504. The central circular hole of the valve seat 504 is opened, and the liquid flows along the central hole of the valve seat 504 through the valve plate 506 and the sealing surface. The gap between the valve seats 504 allows for liquid inlet or outlet. When the fluid pressure weakens, disappears, or reverse fluid pressure appears, the spring force of the spring 508 is greater than the fluid pressure, pushing the valve plate 506 back towards the valve seat 504 until the valve plate tightly contacts the sealing surface of the central hole of the valve seat again, thus sealing the channel and stopping the liquid inlet or outlet operation. If reverse fluid pressure exists, this pressure will be superimposed on the spring force of the spring 508, further enhancing the sealing degree between the valve plate and the valve seat, achieving one-way shut-off of the liquid.

[0088] Specifically, when the medium needs to be input into or output from the diaphragm pump, the fluid pressure acts on the side of valve plate 506 away from valve seat 504, forming a thrust opposite to the elastic force of spring 508. As the fluid pressure gradually increases, when this thrust exceeds the sum of the elastic force of spring 508 and the frictional force between valve plate and sealing surface, valve plate 506 begins to overcome the spring resistance and moves away from valve seat 504. At this time, the central circular hole channel of valve seat 504 is opened, and the medium flows along the central hole of valve seat 504 through valve plate 506 and valve seat 504. The gap between 04 completes the liquid inlet or outlet action; when the fluid pressure weakens, disappears, or reverse fluid pressure appears, the elastic force of spring 508 is greater than the fluid pressure, pushing valve plate 506 to quickly reset towards valve seat 504 until the valve plate tightly fits the sealing surface of the central circular hole of the valve seat again, completing the channel blockage and stopping the liquid inlet or outlet action; if there is reverse fluid pressure, this pressure will be superimposed with the elastic force of spring 508, further enhancing the sealing degree between valve plate and valve seat, realizing reliable one-way shut-off of liquid, and effectively preventing medium backflow.

[0089] Furthermore, the one-way valve mounting plate 501 is mounted on the pump cover 2 by a locking element provided at its edge.

[0090] Specifically, the check valve mounting plate 501 is fixedly installed on the pump cover 2 by locking parts evenly arranged along the edge. During installation, it is necessary to ensure the parallelism and coaxiality between the check valve mounting plate 501 and the pump cover 2. At the same time, a sealing gasket is installed between the two mating surfaces to fill the assembly gap, form a sealing protection, prevent the medium from leaking from the gaps in the mounting surface, and ensure the sealing integrity of the entire pump body.

[0091] Example 2 like Figure 15 As shown, based on the description in Example 1, the diaphragm pump further includes a leak detection mechanism 6, which is located between the drive mechanism 3 and the diaphragm mechanism 4. The leak detection mechanism 6 is used to detect the integrity of the diaphragm and the leakage of the medium. When the diaphragm is damaged or aged, causing the medium to permeate, the leak signal is captured and an alarm or shutdown command is triggered to further increase the zero-leakage function of the diaphragm pump and avoid corrosion and damage to the drive mechanism 3 caused by the leaking medium.

[0092] In this embodiment, to further improve the sealing reliability of the diaphragm pump and eliminate the risk of media leakage, a leak detection mechanism 6 is added. This mechanism, serving as the last line of defense for sealing protection, is precisely positioned between the drive mechanism 3 and the diaphragm mechanism 4, corresponding exactly to the contact area between the power diaphragm 305 and the wetted diaphragm 404. It can directly monitor the working status of the core sealing components. The core function of the leak detection mechanism 6 is to detect the structural integrity of the diaphragm and the leakage of the media in real time. When the power diaphragm 305 or the wetted diaphragm 404 suffers damage, aging, or cracking due to long-term use, causing the transported media to seep through, the mechanism can quickly detect the leakage signal and trigger an alarm command or directly send a shutdown command through a preset control module, forcing the diaphragm pump to stop operating. This further enhances the zero-leakage performance of the diaphragm pump from both active warning and passive protection perspectives, completely preventing leaked media from entering the drive mechanism 3 and causing corrosion, wear, or jamming of precision components such as bearings, eccentric shafts, and plungers. This ensures the long-term stable operation of the drive mechanism and extends the overall service life of the pump body.

[0093] Furthermore, the leak detection mechanism 6 includes at least three sensor mounting holes 601, which are opened on the side surface of the diaphragm mounting plate 401 and communicate with the corresponding center point misaligned stepped holes 402.

[0094] Specifically, the leak detection mechanism 6 adopts a modular design that adapts to the diaphragm mechanism 4, ensuring convenient installation and accurate detection. It includes at least three sensor mounting holes 601 and at least three sensors (not shown in the figure). Each component is deeply integrated with the diaphragm mounting plate 401, without disrupting the original sealing system. The at least three sensor mounting holes 601 are correspondingly located on the side surface of the diaphragm mounting plate 401 facing the drive mechanism 3, and each sensor mounting hole 601 is connected to a corresponding center-point offset stepped hole 402. The connection point precisely corresponds to the edge sealing area of ​​the liquid-contaminated diaphragm 404. This location is the critical node where the medium is most easily penetrated after diaphragm damage, ensuring that leaked medium enters the detection range immediately.

[0095] The leak detection mechanism 6 further includes at least three sensors, which are inserted into the corresponding sensor mounting holes 601; the detection end of the sensor is located in the center point misaligned stepped hole 402.

[0096] Specifically, at least three sensors are inserted one-to-one into the sensor mounting holes 601. During installation, they are sealed and fixed to the inner wall of the mounting holes with sealing rings to prevent secondary seepage of the leaking medium in the detection area through the gap between the sensor and the mounting hole. The sensor's detection end extends into the center-point misaligned stepped hole 402, and the end face of the detection end maintains a preset safe distance from the back of the liquid-contact diaphragm 404. This ensures that the elastic deformation of the liquid-contact diaphragm 404 is not affected, while accurately capturing the medium leakage signal in this area. The sensor type can be selected according to the characteristics of the transported medium. For example, a liquid level sensor or capacitive leak sensor can be used when transporting liquid media, and a gas concentration sensor can be used when transporting corrosive gas media. This ensures high sensitivity and accuracy in detecting leaks of different types of media, achieving a comprehensive protection upgrade from passive sealing to active detection and early warning.

[0097] Example 3 The method for transporting media using this diaphragm pump, applicable to the diaphragm pumps described in Examples 1-2 above, includes: S1. Check the integrity of the assembly of each component of the diaphragm pump, and confirm that the drive mechanism 3, diaphragm mechanism 4, check valve mechanism 5 and anti-leakage detection mechanism 6 are reliably connected, and that the diaphragm pressure plate sealing ring 407 and valve seat sealing ring 505 are installed in place and without damage; connect the medium to be transported to the main inlet 201 of the pump cover 2, and ensure that the medium is free of impurities and the viscosity meets the pump body's operating requirements. At the same time, start the anti-leakage detection mechanism 6 to put each sensor into working condition and monitor the integrity of the diaphragm and leakage in real time.

[0098] Specifically, before starting the conveying operation, a comprehensive inspection of the assembly integrity and connection reliability of all components of the diaphragm pump is required. Special attention should be paid to verifying the fixed connections of the drive mechanism 3, diaphragm mechanism 4, check valve mechanism 5, and leak detection mechanism 6, ensuring that bolts, snap rings, and other locking components are not loose or detached. The installation status of the diaphragm pressure plate sealing ring 407 and valve seat sealing ring 505 should be checked one by one, confirming that they are fully embedded in the corresponding mounting grooves, without damage or deformation, and tightly fitted to the contact surface to prevent media leakage due to seal failure. Then, the medium to be conveyed is connected to the main inlet 201 of the pump cover 2 through the compatible pipeline. Before connection, the medium must be pre-treated to filter out impurities and particles. Simultaneously, it should be confirmed that the medium's viscosity, corrosiveness, and other parameters meet the pump's rated operating requirements to avoid exceeding the equipment's compatibility range and causing component damage. After the medium connection is completed, the leak detection mechanism 6 is activated. The control module activates each sensor, putting it into real-time monitoring mode. The sensor detection accuracy is calibrated, and only after confirming no abnormal alarms can the subsequent operation process proceed.

[0099] S2. Start the motor (not marked in the figure) connected to the integrated eccentric shaft 3011 connecting part 30111. The motor drives the integrated eccentric shaft 3011 to rotate. The tapered roller bearings in the rear bearing housing 3012, the middle bearing housing 3013 and the front bearing housing 3014 are precisely positioned to ensure stable operation of the eccentric shaft. The eccentric part 30112 of the eccentric shaft is locked in position by the locking nut 3018, which drives the plunger drive part 30113 to make eccentric movement, thereby driving the telescopic end at the center of the plunger plate 302, so that the eccentric shaft drive structure 301 acts on at least three plunger mechanisms 304 on the plunger plate 302 in sequence.

[0100] Specifically, the drive motor, which is fixedly connected to the integrated eccentric shaft 3011 connecting part 30111, is started, and the motor output shaft drives the integrated eccentric shaft 3011 to rotate synchronously. During this process, the first, second, and third tapered roller bearings in the rear bearing housing 3012, the middle bearing housing 3013, and the front bearing housing 3014 work together to play a precise limiting role. The tapered roller bearings arranged in opposite directions in the rear and front bearing housings balance axial movement, and the paired tapered roller bearings in the middle bearing housing counteract the radial load generated by the eccentric rotation, ensuring that the eccentric shaft remains stable during high-speed operation without deviation or severe vibration. The eccentric part 30112 of the eccentric shaft is locked relative to the middle bearing seat 3013 by the locking nut 3018 to prevent axial displacement. When the eccentric structure rotates, it drives the plunger drive part 30113 at the front end to perform eccentric reciprocating motion, which in turn acts precisely on the telescopic end at the center of the plunger plate 302, so that the eccentric shaft drive structure 301 applies driving force to at least three plunger mechanisms 304 on the plunger plate 302 in a preset sequence, providing a power basis for media transportation.

[0101] S3. The plunger mechanism 304 performs work within the plunger mounting hole 303, pushing the power diaphragm 305 on the side away from the eccentric shaft drive structure 301 to reciprocate. When the power diaphragm 305 protrudes forward, it drives the liquid-receiving diaphragm 404 of the diaphragm mechanism 4 to move synchronously, reducing the corresponding pump chamber volume and creating positive pressure. When the power diaphragm 305 retracts backward, the pump chamber volume increases, creating negative pressure. During this process, the buffer spring 3044 assists the plunger outer cylinder 3041 and the plunger inner core 3042 to reset, and the universal joint 3043 adapts to the movement angle of the plunger mechanism to ensure smooth power transmission.

[0102] Specifically, each plunger mechanism 304, under the action of driving force, performs reciprocating linear motion along the plunger mounting hole 303 of the plunger plate 302, thereby pushing the power diaphragm 305, which is installed on the side of the plunger mounting hole 303 away from the eccentric shaft drive structure 301, to perform synchronous reciprocating motion. When the plunger mechanism 304 extends forward, the power diaphragm 305 bulges towards the pump cavity under the action of thrust, causing the liquid-contacting diaphragm 404 of the diaphragm mechanism 4 to undergo synchronous elastic deformation, reducing the closed volume of the corresponding pump cavity and creating a positive pressure environment inside; when the plunger mechanism 304 retracts backward, the power diaphragm 305 retracts backward under the action of its own elastic restoring force and the pressure difference inside and outside the pump cavity, and the liquid-contacting diaphragm 404 returns to its original position, increasing the pump cavity volume and creating a negative pressure environment. During this reciprocating process, the buffer spring 3044 between the plunger mounting hole 303 and the plunger outer cylinder 3041 can effectively buffer the impact load of the plunger movement, and at the same time assist the plunger outer cylinder 3041 and the plunger inner core 3042 to quickly reset, improving the smoothness of the movement; the universal joint 3043 at the rear end of the plunger outer cylinder 3041 can flexibly adapt to the movement angle of the plunger mechanism, compensate for the installation coaxiality error, ensure the smooth transmission of power from the eccentric shaft to the plunger mechanism, and avoid component wear due to force offset.

[0103] S4. When a negative pressure is formed in the pump chamber, the valve plate 506 of the inlet mechanism 502 is subjected to the pressure of the medium, overcomes the elastic force of the spring 508 and the friction of the sealing surface, and moves away from the valve seat 504, opening the central circular hole channel of the valve seat. The medium flows from the main inlet 201 into the inlet guide groove 202, and is divided into at least three branches through the clearance hole 205 of the inlet mechanism. It enters the pump chamber through the opened inlet mechanism 502, completing the liquid suction action. When a positive pressure is formed in the pump chamber, the valve plate 506 of the inlet mechanism 502 is reset under the elastic force of the spring 508, tightly fitting the sealing surface of the valve seat to block the inlet channel. At the same time, the positive pressure pushes the valve plate 506 of the outlet mechanism 503 to open, and the medium in the pump chamber flows into the outlet guide groove 204 through the outlet mechanism 503, and is discharged from the main outlet 203 after being collected, completing the liquid discharge action. The cross spring mounting seat 507 limits the spring 508 to ensure accurate valve plate movement and prevent medium backflow.

[0104] Specifically, the pressure change in the pump chamber drives the one-way valve mechanism 5 to complete the directional suction and discharge of the medium, achieving continuous delivery. When a negative pressure is formed in the pump chamber, the valve plate 506 of the inlet mechanism 502, on the side away from the valve seat 504, is subjected to the negative pressure suction of the medium. This suction gradually increases and exceeds the preload of the spring 508 and the friction between the valve plate and the sealing surface. The valve plate 506 overcomes the resistance and moves away from the valve seat 504, and the central circular hole channel of the valve seat is opened. At this time, the external medium flows into the inlet guide groove 202 of the pump cover 2 from the main inlet 201. After being divided by the guide groove, it forms at least three branches, which enter each group of inlet mechanisms 502 through the corresponding inlet mechanism clearance holes 205, and then flow into the pump chamber through the opened channel to complete the suction action. When positive pressure is generated in the pump chamber, the valve plate 506 of the inlet mechanism 502 loses its negative pressure suction and quickly resets under the elastic force of the spring 508. Its side surface tightly adheres to the sealing surface of the valve seat 504, completely sealing the inlet channel and preventing backflow of the medium. Simultaneously, the positive pressure in the pump chamber acts on the valve plate 506 of the outlet mechanism 503, pushing the valve plate to overcome the spring force and open the channel. The medium in the pump chamber is discharged through the outlet mechanism 503 to the outlet guide channel 204, and after being collected in the guide channel, it is discharged from the main outlet 203 to the external pipeline, completing the discharge action. During this process, the cross spring mounting seat 507 precisely limits the spring 508, preventing spring displacement or twisting, ensuring precise and controllable opening and resetting actions of the valve plate, and further enhancing the one-way shut-off effect.

[0105] S5. During the entire process of media transportation, the sensor of the leak detection mechanism 6 detects the situation inside the misaligned stepped hole 402 at the center point through the sensor mounting hole 601. If the liquid-contacting diaphragm 404 or the power diaphragm 305 is damaged or aged, causing media to seep in, the sensor captures the leakage signal and immediately triggers an alarm or shutdown command to prevent the leaked media from corroding the drive mechanism 3 and ensure equipment safety.

[0106] Specifically, throughout the entire media transport process, the leak detection mechanism 6 remains continuously operational. Each sensor, through its mounting hole 601, extends into the center-point misaligned stepped hole 402 to detect the presence of media in that area in real time. Since this area is located between the wetted diaphragm 404 and the dynamic diaphragm 305, it is the first area to accumulate after a media leak, enabling rapid detection of leak signals. If the wetted diaphragm 404 or the dynamic diaphragm 305 is damaged or aged due to long-term wear, media corrosion, or other reasons, causing the transported media to seep into this area, the sensor will immediately detect the leak signal. For example, liquid media may trigger changes in liquid level or capacitance, while gaseous media may trigger changes in concentration. The sensor will then quickly transmit the signal to the control module, which will immediately trigger a preset early warning mechanism. Priority will be given to activating an audible and visual alarm to alert the operator. If the leakage reaches a preset threshold, a shutdown command will be sent directly, forcing the motor to stop operating and preventing further media leakage at the source. This prevents the leaked media from entering the drive mechanism 3 and corroding precision components such as the eccentric shaft, bearings, and plungers, ensuring safe equipment operation.

[0107] S6. After the medium is transported, the motor is turned off, the drive mechanism stops running, the diaphragm returns to its initial state under the action of the spring reset, and all the valve plates of the one-way valve mechanism 5 are reset to block the channel; the medium source and the main outlet 203 are closed, the residual medium in the pump chamber and the guide channel is cleaned, the leak detection mechanism 6 is turned off, and the entire transport process is completed.

[0108] Specifically, after the media conveying task is completed, the drive motor is first turned off, the drive mechanism 3 stops power output, the plunger mechanism 304 resets under the action of the buffer spring 3044, the power diaphragm 305 and the liquid-receiving diaphragm 404 return to their initial state, and all valve plates of the one-way valve mechanism 5 reset under the elastic force of the corresponding spring 508, tightly sealing the inlet and outlet channels to prevent residual media backflow or leakage. Then, the supply valve of the media source and the pipeline valve of the main outlet 203 are closed to disconnect the media conveying link. Depending on the characteristics of the conveyed medium, the pump chamber and the inlet and outlet guide channels are cleaned. For corrosive or viscous media, residual parts must be rinsed with a special cleaning medium to avoid media residue corroding components or affecting future use; for clean media, residue can be removed by purging with dry gas. After cleaning, the leak detection mechanism 6 is turned off, the main power supply of the equipment is cut off, a brief inspection of each component is performed, the operating status is recorded, and the entire media conveying process is completed.

[0109] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A diaphragm pump, characterized in that, This diaphragm pump delivers the medium by changing the pump chamber volume and separates the delivered medium from the drive mechanism, achieving zero-leakage delivery. The diaphragm pump includes: Pump casing (1) and pump cover (2); A drive mechanism (3) is provided to power the diaphragm pump; the drive mechanism (3) is located inside the pump housing (1); The diaphragm mechanism (4) is used to realize the intake and discharge of the medium through the reciprocating drive of the drive mechanism (3), and to prevent the medium from penetrating into the drive mechanism (3) and protect the normal operation of the drive mechanism (3); the diaphragm mechanism (4) is connected to the drive mechanism (3); The one-way valve mechanism (5) is used to provide a flow path for the conveying medium, guide the medium to enter and exit the pump chamber in a preset direction, and prevent the medium from flowing back; the one-way valve mechanism (5) is connected to the diaphragm mechanism (4); the one-way valve mechanism (5) is connected to the pump cover (2); The diaphragm mechanism (4) is driven by the drive mechanism (3) to complete the reciprocating motion and directly change the volume of the pump chamber, forming a cycle of negative pressure intake of medium and positive pressure discharge of medium, thereby realizing the intake and discharge of medium.

2. The diaphragm pump according to claim 1, characterized in that, The drive mechanism (3) includes: An eccentric shaft drive structure (301) is located inside the pump casing (1); A plunger plate (302) is mounted on the pump housing (1); the telescopic end of the eccentric shaft drive structure (301) is located at the center of the plunger plate (302); the plunger plate (302) is provided with at least three plunger mounting holes (303). At least three plunger mechanisms (304) are installed in corresponding plunger mounting holes (303); At least three power diaphragms (305) are respectively mounted on the side of the plunger mounting hole (303) away from the eccentric shaft drive structure (301); In this process, the eccentric shaft drive structure (301) sequentially drives the plunger mechanism (304) to perform work in the plunger plate (302), pushing the power diaphragm (305) to bulge forward or retract backward.

3. The diaphragm pump according to claim 1, characterized in that, The eccentric shaft drive structure (301) includes an integral eccentric shaft (3011), a rear bearing housing (3012), a middle bearing housing (3013), and a front bearing housing (3014). The integrated eccentric shaft (3011) includes a connecting part (30111) concentric with a preset motor shaft, an eccentric part (30112) located in front of the connecting part, and a plunger drive part (30113) located in front of the eccentric part (30112). The plunger drive part (30113) is concentric with the connecting part (30111). The rear bearing housing (3012) is mounted on the connecting part (30111) and a first tapered roller bearing (3015) is installed in the rear bearing housing (3012). The middle bearing housing (3013) is mounted on the eccentric part (30112) and a pair of opposing tapered roller bearings (3016) are installed in the middle bearing housing (3013). The front bearing housing (3014) is mounted on the front end of the plunger drive part (30113) and a third tapered roller bearing (3017) is installed in the front bearing housing (3014). The tapered shape of the third tapered roller bearing (3017) in the front bearing housing (3014) is opposite to that of the first tapered roller bearing (3015) in the rear bearing housing (3012). The eccentric part (30112) has an external thread in front of the central bearing seat (3013), and a locking nut (3018) is installed on the external thread.

4. The diaphragm pump according to claim 3, characterized in that, Each of the plunger mechanisms (304) includes a plunger outer cylinder (3041), a plunger inner core (3042), and a universal joint (3043). The plunger outer cylinder (3041) is located inside a corresponding plunger plate (302), and a buffer spring (3044) is installed inside the plunger plate (302). The plunger inner core (3042) is fixedly installed on the upper part of the plunger outer cylinder (3041), and the power diaphragm (305) is fixedly installed on the top of the plunger inner core (3042), with its outer edge sealed and fixed to the plunger plate (302). The plunger outer cylinder (3041) has a universal joint relief groove (3045) at the middle of its rear end. The universal joint (3043) is installed in the universal joint relief groove (3045) by a snap ring (3046) installed in the universal joint relief groove (3045).

5. The diaphragm pump according to claim 2, characterized in that, The diaphragm mechanism (4) includes: A diaphragm mounting plate (401) is provided with at least three center point misaligned stepped holes (402); the center point misaligned stepped holes (402) are provided with liquid receiving diaphragm relief grooves (403) on the side near the one-way valve mechanism (5). At least three liquid-receiving diaphragms (404) are located within corresponding liquid-receiving diaphragm relief grooves (403); At least three diaphragm plates (405) are provided, wherein the liquid-receiving diaphragm (404) is installed in the liquid-receiving diaphragm relief groove (403) by means of the diaphragm plates (405) installed in the liquid-receiving diaphragm relief groove (403); the diaphragm plates (405) are provided with sealing ring mounting grooves (406). At least three diaphragm plate sealing rings (407) are located within the sealing ring mounting groove (406).

6. The diaphragm pump according to claim 3, characterized in that, The one-way valve mechanism (5) includes: a one-way valve mounting plate (501), which is used to support all the components of the one-way valve; the one-way valve mounting plate (501) is provided with at least three liquid inlet holes and three liquid outlet holes; At least three liquid inlet mechanisms (502) are used to input liquid into the diaphragm pump by the reciprocating motion of the diaphragm pump; each of the liquid inlet mechanisms (502) is installed in a corresponding liquid inlet port; At least three liquid discharge mechanisms (503) are used to discharge liquid from the diaphragm pump to the outside of the diaphragm pump by means of the reciprocating motion of the diaphragm pump; each of the liquid discharge mechanisms (503) is installed in a corresponding liquid discharge port; The liquid inlet mechanism (502) and the liquid outlet mechanism (503) have the same structure; the liquid inlet mechanism (502) is arranged in the direction of liquid input into the diaphragm pump; the liquid outlet mechanism (503) is arranged in the direction of liquid output to the outside of the diaphragm pump; Both the liquid inlet mechanism (502) and the liquid outlet mechanism (503) include: a valve seat (504), which is installed in the liquid inlet or inside the liquid inlet; a sealing ring (505) is provided between the valve seat (504) and the liquid inlet or the inner wall of the liquid inlet, and the sealing ring (505) is used to fill the assembly gap between the valve seat (504) and the hole wall to prevent liquid from leaking from the gap between the valve seat (504) and the hole wall, forming a secondary sealing protection; A valve disc (506) is located in the central circular hole of the valve seat (504); the side surface of the valve disc (506) is the sealing surface of the valve seat (504); A cross spring mounting base (507) is connected to the bottom surface of the valve seat (504) at its four corners; a spring mounting space is formed between the valve seat (504) and the cross spring mounting base (507); A spring (508) is installed in a spring mounting space; one end of the spring (508) is connected to the surface of the valve plate (506), and the other end is connected to the inner surface of the cross spring mounting seat (507); The spring (508) applies a force to the valve plate (506) pointing towards the valve seat (504) by the elastic force of the spring (508), pushing the side surface of the valve plate (506) to tightly fit the sealing surface of the central hole of the valve seat (504). When liquid enters the diaphragm pump or exits the diaphragm pump, the fluid pressure acts on the side of the valve plate (506) away from the valve seat (504), forming a thrust opposite to the elastic force of the spring (508). As the fluid pressure gradually increases, when the thrust exceeds the sum of the elastic force of the spring (508) and the friction force of the sealing surface, the valve plate (506) begins to overcome the spring resistance and moves away from the valve seat (504). The central circular hole of the valve seat (504) is opened, and the liquid flows through the gap between the valve plate (506) and the valve seat (504) along the central hole of the valve seat (504), completing the liquid inlet or outlet. When the fluid pressure weakens, disappears, or reverse fluid pressure appears, the elastic force of the spring (508) is greater than the fluid pressure, pushing the valve plate (506) to return to the valve seat (504) until the valve plate tightly fits the sealing surface of the central hole of the valve seat again, completing the sealing of the channel, and the liquid inlet or outlet action stops. If there is reverse fluid pressure, this pressure will be superimposed on the elastic force of the spring (508), further enhancing the sealing degree between the valve plate and the valve seat, and realizing one-way shut-off of the liquid.

7. The diaphragm pump according to claim 6, characterized in that, The pump cover (2) is provided with a main water inlet (201), a water inlet guide channel (202), a main water outlet (203), and a water outlet guide channel (204); the water inlet guide channel (202) is provided with at least three liquid inlet mechanism clearance holes (205); the water outlet guide channel (204) is provided with at least three liquid outlet mechanism clearance holes (206). After entering through the main inlet (201), the medium is divided into at least three branches by the inlet guide channel (202) and flows into the liquid inlet mechanism (502) before entering the diaphragm pump. The medium in the diaphragm pump is collected by at least three liquid outlet mechanisms (503) and flows into the outlet guide channel (204) before leaving the diaphragm pump from the main outlet (203). The one-way valve mounting plate (501) is mounted on the pump cover (2) by a locking element provided at the edge.

8. The diaphragm pump according to claim 1, characterized in that, The diaphragm pump also includes a leak detection mechanism (6), which is located between the drive mechanism (3) and the diaphragm mechanism (4). The leak detection mechanism (6) is used to detect the integrity of the diaphragm and the leakage of the medium. When the diaphragm is damaged or aged, causing the medium to permeate, the leak signal is captured and an alarm or shutdown command is triggered to further increase the zero leakage effect of the diaphragm pump and avoid corrosion and damage to the drive mechanism (3) caused by the leaking medium.

9. The diaphragm pump according to claim 8, characterized in that, The leak detection mechanism (6) includes: At least three sensor mounting holes (601) are provided on the side surface of the diaphragm mounting plate (401) and communicate with the corresponding center point misaligned stepped holes (402); At least three sensors are inserted into corresponding sensor mounting holes (601); the detection end of the sensor is located in a center-point misaligned stepped hole (402).

10. A method for transporting a medium using the diaphragm pump, characterized in that, This method is applicable to any one of the diaphragm pumps according to claims 1-9, and the method includes: S1. Check the integrity of the assembly of each component of the diaphragm pump, and confirm that the drive mechanism (3), diaphragm mechanism (4), check valve mechanism (5) and anti-leakage detection mechanism (6) are reliably connected, and that the diaphragm pressure plate sealing ring 407 and valve seat sealing ring 505 are installed in place and without damage; connect the medium to be transported to the main inlet (201) of the pump cover (2), and ensure that the medium is free of impurities and that the viscosity meets the pump body operation requirements. At the same time, start the anti-leakage detection mechanism (6) so that each sensor enters the working state and monitors the integrity of the diaphragm and leakage in real time. S2. Start the motor connected to the integrated eccentric shaft (30111) connection part (30111). The motor drives the integrated eccentric shaft (3011) to rotate. The tapered roller bearings in the rear bearing housing (3012), middle bearing housing (3013) and front bearing housing (3014) are precisely positioned to ensure stable operation of the eccentric shaft. The eccentric part (30112) of the eccentric shaft is locked in position by the locking nut (3018), which drives the plunger drive part (30113) to make eccentric movement, thereby driving the telescopic end at the center of the plunger plate (302), so that the eccentric shaft drive structure (301) acts on at least three plunger mechanisms (304) on the plunger plate (302) in sequence. S3. The plunger mechanism (304) performs work in the plunger mounting hole (303), pushing the power diaphragm (305) on the side away from the eccentric shaft drive structure (301) to reciprocate. When the power diaphragm (305) protrudes forward, it drives the liquid-receiving diaphragm (404) of the diaphragm mechanism (4) to move synchronously, reducing the corresponding pump chamber volume and forming positive pressure. When the power diaphragm (305) retracts backward, the pump chamber volume increases and forms negative pressure. During this process, the buffer spring (3044) assists the plunger outer cylinder (3041) and the plunger inner core (3042) to reset, and the universal joint (3043) adapts to the movement angle of the plunger mechanism to ensure smooth power transmission. S4. When a negative pressure is formed in the pump chamber, the valve plate (506) of the liquid inlet mechanism (502) is subjected to the pressure of the medium, overcomes the elastic force of the spring (508) and the friction of the sealing surface, and moves away from the valve seat (504), opening the central circular hole channel of the valve seat; the medium flows from the main inlet (201) into the water inlet guide groove (202), and is divided into at least three branches through the clearance hole (205) of the liquid inlet mechanism, entering the pump chamber through the opened liquid inlet mechanism (502) to complete the liquid suction action; when a positive pressure is formed in the pump chamber, the liquid inlet... The valve plate (506) of the liquid mechanism (502) is reset under the elastic force of the spring (508), tightly fitting the valve seat sealing surface to block the liquid inlet channel; at the same time, the positive pressure pushes the valve plate (506) of the liquid outlet mechanism (503) to open, and the medium in the pump chamber flows into the water outlet guide groove (204) through the liquid outlet mechanism (503), and is discharged from the main water outlet (203) after being collected, completing the liquid discharge action; the cross spring mounting seat (507) limits the spring (508) to ensure accurate valve plate action and prevent medium backflow; S5. During the entire process of media transportation, the sensor of the leak detection mechanism (6) detects the situation inside the misaligned stepped hole (402) at the center point through the sensor mounting hole (601). If the liquid-contacting diaphragm (404) or the power diaphragm (305) is damaged or aged, causing media to permeate, the sensor captures the leakage signal and immediately triggers an alarm or shutdown command to prevent the leaked medium from corroding the drive mechanism (3) and ensure equipment safety. S6. After the medium is transported, turn off the motor, the drive mechanism stops running, the diaphragm returns to its initial state under the action of the spring reset, and all the valve plates of the one-way valve mechanism (5) are reset to block the channel; close the medium source and the main outlet (203), clean the residual medium in the pump chamber and the guide channel, close the leak detection mechanism (6), and complete the entire transport process.

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