Chemical variable-frequency vacuum pump structure convenient to disassemble and assemble

Abstract

The invention relates to the technical field of vacuum pumps, and particularly discloses a chemical variable-frequency vacuum pump structure convenient to disassemble and assemble, which comprises a pump body, a first diaphragm assembly and a second diaphragm assembly, the upper parts of the first diaphragm assembly and the second diaphragm assembly are communicated through a discharging pipeline, and the lower parts are communicated through a feeding pipeline; mounting shells are arranged on the two sides of the pump body respectively, flanges are arranged on the edges of the mounting shells, and the first diaphragm assembly and the second diaphragm assembly are arranged in the mounting shells on the two sides of the pump body and fixedly connected with the mounting shells through detachable fasteners. A variable frequency driving device is arranged in the pump body, connected with the first diaphragm assembly and the second diaphragm assembly and used for driving the first diaphragm assembly and the second diaphragm assembly to do reciprocating motion, and suction and discharge of chemical media are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum pumps, and in particular discloses a chemical variable frequency vacuum pump structure that is easy to assemble and disassemble. Background Art

[0002] In the chemical industry, chemical variable frequency vacuum pumps are key equipment for transporting and processing chemical media. The rationality of their structural design directly affects the equipment's operating efficiency, reliability, and ease of maintenance. Existing chemical variable frequency vacuum pumps face numerous challenges in practical applications: First, the complex connection structure between the diaphragm assembly and the pump body of traditional pumps makes assembly and disassembly cumbersome, resulting in inefficient maintenance and repair, making it difficult to meet the demands of continuous and efficient chemical production. Second, the diaphragm is susceptible to erosion and wear during long-term contact with chemical media, which reduces its reliability and stability. Frequent replacement not only increases costs but can also impact production processes. Furthermore, there is room for improvement in the transmission efficiency of the variable frequency drive, the reliability of the sealing structure, the backflow prevention effect of the one-way valve, and the smoothness of air pressure regulation. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the present invention aims to provide a chemical variable frequency vacuum pump structure that is easy to assemble and disassemble.

[0004] To achieve the above-mentioned purpose, the present invention provides a detachable chemical variable frequency vacuum pump structure, comprising a pump body, a first diaphragm assembly and a second diaphragm assembly respectively arranged on both sides of the pump body; the first diaphragm assembly and the second diaphragm assembly are connected above through a discharge pipe and below through a feed pipe; mounting shells are respectively provided on both sides of the pump body, and flanges are provided on the edges of the mounting shells, and the first diaphragm assembly and the second diaphragm assembly are respectively installed in the mounting shells on both sides of the pump body and fixedly connected to the mounting shells by detachable fasteners; a variable frequency drive device is provided inside the pump body, and the variable frequency drive device is connected to the first diaphragm assembly and the second diaphragm assembly respectively, and the variable frequency drive device is used to drive the first diaphragm assembly and the second diaphragm assembly to reciprocate to achieve suction and discharge of chemical media;

[0005] The diaphragm assembly includes a diaphragm plate connected to the variable frequency drive device, a diaphragm cover installed on the diaphragm plate, the diaphragm cover and the diaphragm plate together form an air chamber, the diaphragm plate includes a multi-layer diaphragm structure, the diaphragm plate includes a base diaphragm, an intermediate buffer layer arranged on both sides of the base diaphragm, and a surface protective layer coated on the outer surface of the intermediate buffer layer away from the base diaphragm.

[0006] This easily disassembled chemical variable frequency vacuum pump structure features first and second diaphragm assemblies on either side of the pump body. These diaphragm assemblies are connected vertically via a discharge and feed pipe, embedded within a flanged mounting shell and secured with removable fasteners for easy assembly and disassembly. A variable frequency drive within the pump body drives the diaphragm assembly to reciprocate, achieving suction and discharge of the chemical medium. The diaphragm assembly's diaphragm sheet utilizes a multilayer structure consisting of a base diaphragm, an intermediate buffer layer, and a surface protective layer. The intermediate buffer layer enhances cushioning performance, while the surface protective layer improves resistance to chemical corrosion and extends the diaphragm's service life. The air chamber design, combined with the variable frequency drive, precisely controls medium delivery. The overall structure is easy to assemble and disassemble, highly corrosion-resistant, and suitable for the efficient delivery of chemical media.

[0007] The base diaphragm can be made of engineering plastics (such as PEEK) or metal alloys (such as titanium alloy) that have both strength and a certain degree of elasticity to withstand stress and maintain shape; the middle buffer layer needs to use highly elastic materials such as fluororubber, EPDM rubber, silicone or polyurethane, using its elastic deformation to absorb the impact force during reciprocating motion and reduce vibration wear.

[0008] The surface protection layer is a polyurethane coating or a ceramic coating, which protects the diaphragm from erosion and wear by chemical media and improves the reliability and stability of the diaphragm.

[0009] When polyurethane coating or ceramic coating is selected as the surface protection layer, dual protection of the diaphragm can be achieved through the material properties: the polyurethane coating has high elasticity and wear resistance, can maintain flexible deformation under the erosion of chemical media, and reduce the tearing and wear caused by reciprocating motion. At the same time, its molecular structure has good tolerance to most acids, alkalis and oils, and is suitable for working conditions containing trace particles or moderate corrosion; ceramic coating (such as aluminum oxide and zirconium oxide) has super-hard wear resistance as its core advantage, with a hardness of up to HRC80, which can resist the erosion and wear of media containing solid particles. It is also extremely chemically inert and can withstand strong acids, strong alkalis and high temperature environments, and is especially suitable for extreme scenarios with strong corrosion and high wear. Both are evenly attached to the surface of the diaphragm through the coating process, forming a protective barrier to isolate the chemical media, and can improve the wear resistance of the diaphragm through the mechanical properties of the material itself, thereby significantly extending its service life and ensuring the reliability and stability of the vacuum pump under complex working conditions.

[0010] The variable frequency drive device includes a servo motor, an eccentric wheel mechanism and a connecting rod assembly. The two ends of the connecting rod assembly are respectively hinged to the first diaphragm assembly and the second diaphragm assembly. The eccentric wheel converts the rotational motion of the motor into the linear reciprocating motion of the diaphragm.

[0011] The variable frequency drive device converts the rotational motion into the linear reciprocating motion of the diaphragm through the coordinated operation of the servo motor, the eccentric wheel mechanism and the connecting rod assembly: the servo motor can accurately adjust the speed and torque, and cooperate with the eccentric distance design of the eccentric wheel in the eccentric wheel mechanism to make the rotational motion produce radial displacement changes, and then through the hinge structure of the two ends of the connecting rod assembly and the first and second diaphragm assemblies, the circular motion of the eccentric wheel is synchronously transmitted to the reverse linear reciprocating motion of the diaphragms on both sides; this design utilizes the mechanical transmission characteristics of the eccentric wheel, which not only realizes the conversion of motion form, but also can adjust the speed of the servo motor through frequency conversion, flexibly control the reciprocating frequency of the diaphragm, and then accurately adjust the suction flow and pressure of the vacuum pump. At the same time, the symmetrical structure of the double-sided connecting rod hinge can balance the lateral force in the movement, reduce the wear of the diaphragm assembly, and improve the stability and transmission efficiency of the drive system.

[0012] The diaphragm is provided with a first boss, the diaphragm cover is provided with a second boss, the first boss is provided with a first through hole, the second boss is provided with a second threaded hole, and the flange of the edge of the mounting shell is provided with a third through hole. The fastener passes through the third through hole and the first through hole in sequence and is threadedly connected with the second threaded hole, so that the flange of the mounting shell and the second boss of the diaphragm cover jointly clamp the first boss of the diaphragm; a first sealing ring groove is provided between the contact surfaces of the first boss and the second boss, and a second sealing ring groove is provided between the flange of the mounting shell and the contact surface of the second boss of the diaphragm cover, and corrosion-resistant sealing elements are installed in the first sealing ring groove and the second sealing ring groove; the depth of the first sealing ring groove and the second sealing ring groove is 70%-80% of the cross-sectional diameter of the sealing element to ensure sufficient compression rate after installation.

[0013] The first boss and the second boss are both provided with a first sealing ring groove, which jointly clamp the corrosion-resistant sealing element. The flange and the second boss are both provided with a second sealing ring groove, which jointly clamp the corrosion-resistant sealing element.

[0014] This structure achieves reliable connection and leakage prevention through boss clamping and double sealing design: the first boss of the diaphragm and the second boss of the diaphragm cover form a clamping structure through a fastener (passing through the third through hole of the mounting shell flange, the first through hole of the first boss, and then threadedly connected to the second threaded hole of the second boss), which facilitates disassembly and assembly while providing mechanical fastening force; a first sealing ring groove is provided on the contact surface between the first boss and the second boss, and a second sealing ring groove is provided on the contact surface between the mounting shell flange and the second boss of the diaphragm cover. Corrosion-resistant sealing elements (such as fluororubber O-rings) are installed in the two grooves, and the groove depth is designed to be 70%-80% of the cross-sectional diameter of the sealing element (such as a 5mm diameter element corresponds to a 3.5-4mm groove depth), ensuring that the sealing element obtains sufficient compression rate to produce elastic deformation, forming a double sealing barrier, which not only prevents chemical media from leaking from the junction of the diaphragm and the diaphragm cover, but also blocks the overflow of media or the intrusion of external impurities. It is suitable for scenes with high requirements on sealing and corrosion resistance such as chemical and pharmaceutical industries.

[0015] A lubricating oil cavity is provided in the pump body, the connecting rod assembly is provided in the lubricating oil cavity, and the lubricating oil cavity is installed on the outside of the connecting rod assembly via a sealing structure.

[0016] This design achieves efficient lubrication and protection of the connecting rod assembly through the combination of lubricating oil chamber and sealing structure: an independent lubricating oil chamber is set in the pump body to completely encapsulate the connecting rod assembly, and the lubricating oil chamber is tightly fitted to the outside of the connecting rod assembly through mechanical seals, lip seals or labyrinth seals to form a closed lubrication system; the lubricating oil circulates in the cavity, which can not only reduce the friction resistance at the hinge of the connecting rod assembly (such as the hinge points between the eccentric wheel and the connecting rod, and the connecting rod and the diaphragm assembly), reduce wear and improve transmission efficiency, but also absorb the heat generated by movement to prevent the degradation of material properties due to temperature increase; the sealing structure effectively blocks external chemical media from invading the lubricating oil chamber, avoids the contamination or emulsification of the lubricating oil, and prevents the leakage of lubricating oil to contaminate other parts of the pump body or process media. It is especially suitable for scenarios where highly corrosive and high-purity media are transported. The synergistic effect of lubrication and protection extends the service life of the connecting rod assembly and ensures the long-term and stable operation of the vacuum pump.

[0017] A first one-way valve is provided on the discharge pipe, and a second one-way valve is provided on the feed pipe. The one-way valve includes a spherical seat connected to the discharge pipe and the feed pipe. The spherical seat forms a spherical chamber. A sphere and an elastic component for driving the sphere to reset are movably provided in the spherical chamber. The sphere can move in the spherical chamber to drive the elastic component to elastically deform, so as to realize the one-way conduction function and prevent the backflow of the chemical medium.

[0018] This design utilizes first and second check valves, respectively, in the discharge and feed pipes. The spherical seat and ball cooperate to achieve one-way flow of chemical media. The spherical seat of the check valve connects to the pipe, forming a spherical chamber within which the ball can roll freely. During forward flow, pressure pushes the ball away from the valve seat, opening the flow path. During reverse flow, pressure on the ball presses against the sealing surface of the spherical seat, blocking reverse flow. For example, in the discharge pipe, when the diaphragm assembly is squeezed, the medium pushes the ball to open the channel for discharge. During pumping, the ball falls back to seal against reverse flow. In the feed pipe, during the suction phase, the ball is drawn open, allowing the medium to flow in. During the squeeze phase, the ball seals against reverse flow. This structure leverages the mechanical principle of ball rolling to achieve energy-free one-way control. The spherical sealing surface has a uniform contact area with the medium, ensuring high sealing reliability. Furthermore, the ball and spherical seat can be made of corrosion-resistant stainless steel, PTFE, or ceramic, making them suitable for highly corrosive media, effectively preventing chemical backflow and ensuring pump delivery efficiency and stability.

[0019] A first pressure regulating assembly and a second pressure regulating assembly are provided in the pump body. The first pressure regulating assembly is connected to the first diaphragm assembly, and the second pressure regulating assembly is connected to the second diaphragm assembly. The first pressure regulating assembly and the second pressure regulating assembly respectively regulate the air pressure in the air chamber of the first diaphragm assembly and the air chamber of the second diaphragm assembly.

[0020] The first pressure regulating assembly and the second pressure regulating assembly both include a pressure regulating tube body and a pressure regulating driving member connected to the pressure regulating tube body. One end of the pressure regulating tube body away from the pressure regulating driving member is connected to the air chamber. An air pressure detection gauge is also provided on the outside of the pump body.

[0021] This design achieves precise pressure control by setting up independent first and second pressure-regulating components in the pump body, which are respectively connected to the air chambers of the diaphragm components on both sides, and cooperating with an external air pressure detection gauge: the pressure-regulating component uses a pressure-regulating tube body to connect the pressure-regulating driver (such as an electric servo valve or a pneumatic proportional valve) and the air chamber. The driver dynamically adjusts the air pressure in the air chamber according to the feedback from the detection gauge (such as replenishing air when the pressure is insufficient and releasing pressure when the pressure is too high), which can compensate for the pressure imbalance caused by diaphragm wear or changes in medium characteristics, and improve the operation stability of the pump body; the pressure-regulating tube body is made of corrosion-resistant material (such as stainless steel or PTFE), with an inner diameter of 10-20mm to ensure smooth airflow, and cooperates with high-precision drivers (accuracy of ±0.5kPa) to achieve a pressure control error within ±1.5%. The external air pressure detection gauge (range 0-200kPa, accuracy level 1.6) provides visual monitoring. The overall design significantly extends the life of the diaphragm (up to more than twice that of an ordinary pump body), which is especially suitable for high-viscosity or corrosive medium transportation scenarios.

[0022] The pressure regulating drive component is a stepping motor, and a spiral channel is provided in the pressure regulating tube body. The spiral channel is used to slow down the rate of change of air pressure between the air chamber and the external environment to achieve smooth regulation of the air pressure; the pitch of the spiral channel gradually decreases from the air inlet end of the pressure regulating tube body to the air chamber connection end, forming a nonlinear air pressure buffer gradient.

[0023] As gas passes through a spiral channel, the reduced pitch compresses the channel volume, lengthens the flow path, and increases the frequency of gas molecule collisions, creating dynamic resistance. This resistance increases nonlinearly with the direction of gas propulsion (from the inlet end to the chamber end), causing the rate of pressure change to exhibit a "fast at the beginning and slow at the end" decay characteristic. This avoids the sudden pressure changes or regulation lags associated with the constant resistance of traditional linear channels. As the target pressure is approached, the high resistance at the end of the channel further slows the rate of pressure change, preventing pressure overshoot caused by stepper motor control errors and improving system stability.

[0024] The lower end of the spherical seat is the inlet end, and the upper end of the spherical seat is the outlet end. Both the inlet end and the outlet end are provided with a conical guide port. The cone angle of the guide port at the inlet end is 30-45 degrees, and the cone angle of the guide port at the outlet end is 15-25 degrees.

[0025] The large cone angle (30-45°) at the inlet reduces turbulence when the medium enters, and the small cone angle (15-25°) at the outlet guides the fluid to discharge smoothly, reducing pressure loss and improving the flow capacity of the one-way valve. The large cone angle design forms a gradually expanding flow channel, reducing the sudden change in flow velocity when the medium enters the spherical seat, reducing turbulence and pressure loss. It is especially suitable for high-viscosity or particulate-containing media, avoiding accumulation or blockage of the medium at the inlet. Expanding the inlet cross-section can disperse the impact force of the medium on the sphere, extending the service life of the sphere and the spherical seat, especially under high pressure difference conditions. The small cone angle design forms a gradually contracting flow channel, which has a rectifying effect on the discharged medium, reducing eddy currents and energy dissipation at the outlet, and improving the flow efficiency of the one-way valve.

[0026] The beneficial effects of the present invention are as follows: the detachable chemical variable frequency vacuum pump realizes efficient chemical medium transportation through modular double diaphragm components, variable frequency servo drive and intelligent pressure regulation system. It adopts a multi-layer diaphragm structure (base layer + buffer layer + polyurethane / ceramic coating) and a double corrosion-resistant sealing design, which significantly improves chemical resistance and service life; the variable frequency servo motor drives the eccentric wheel-connecting rod mechanism, and cooperates with the spiral pressure regulation channel to realize nonlinear buffering of air pressure to ensure stable pressure; the valveless one-way valve adopts a conical guide port (inlet 30-45° / outlet 15-25°) to optimize the flow field and reduce pressure loss; the lubricating oil chamber encapsulates the connecting rod assembly to reduce friction loss. The overall design makes the equipment have high reliability, strong medium compatibility, low maintenance cost and energy-saving characteristics, which is especially suitable for harsh chemical scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 A cross-sectional view of the entire present invention;

[0029] Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure of structure A in the middle;

[0030] Figure 4 Schematic diagram of the structure of the diaphragm sheet of the present invention;

[0031] Figure 5 An exploded view of the entirety of the present invention;

[0032] Figure 6 A schematic structural diagram of another perspective of the present invention as a whole;

[0033] Figure 7 It is a cross-sectional view of the spiral channel of the present invention.

[0034] Reference numerals include:

[0035] 1. Pump body; 2. First diaphragm assembly; 3. Second diaphragm assembly; 4. Discharge pipe; 5. Feed pipe; 6. Mounting shell; 7. Flange; 8. Frequency conversion drive; 9. Diaphragm; 11. Diaphragm cover; 12. Air chamber; 13. Base diaphragm; 14. Intermediate buffer layer; 15. Surface protection layer; 16. Servo motor; 17. Eccentric wheel mechanism; 18. Connecting rod assembly; 19. First boss; 21. Second boss; 22. First pass Hole; 23. Second threaded hole; 24. Third through hole; 25. First sealing ring groove; 26. Second sealing ring groove; 28. Lubricating oil chamber; 29. ​​First one-way valve; 31. Second one-way valve; 32. Spherical seat; 33. Spherical chamber; 34. Ball; 35. First pressure regulating assembly; 36. Second pressure regulating assembly; 37. Pressure regulating tube body; 38. Pressure regulating drive; 39. Air pressure detection gauge; 41. Spiral channel; 42. Conical guide port. DETAILED DESCRIPTION

[0036] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0037] See also Figures 1 to 7As shown, the present invention provides a detachable chemical frequency conversion vacuum pump structure, comprising a pump body 1, a first diaphragm assembly 2 and a second diaphragm assembly 3 respectively arranged on both sides of the pump body 1; the first diaphragm assembly 2 and the second diaphragm assembly 3 are connected above through a discharge pipe 4, and below through a feed pipe 5; mounting shells 6 are respectively provided on both sides of the pump body 1, and flanges 7 are provided on the edges of the mounting shells 6, the first diaphragm assembly 2 and the second diaphragm assembly 3 are respectively installed in the mounting shells 6 on both sides of the pump body 1, and are fixedly connected to the mounting shells 6 by detachable fasteners; a frequency conversion drive device 8 is provided inside the pump body 1, and the frequency conversion drive device 8 is connected to the first diaphragm assembly 2 and the second diaphragm assembly 3 respectively, and the frequency conversion drive device 8 is used to drive the first diaphragm assembly 2 and the second diaphragm assembly 3 to reciprocate, thereby realizing the suction and discharge of the chemical medium;

[0038] The diaphragm assembly includes a diaphragm sheet 9 connected to the variable frequency drive device 8, a diaphragm cover 11 installed on the diaphragm sheet 9, the diaphragm cover 11 and the diaphragm sheet 9 together form an air chamber 12, the diaphragm sheet 9 includes a multi-layer diaphragm structure, the diaphragm sheet 9 includes a base diaphragm 13, an intermediate buffer layer 14 arranged on both sides of the base diaphragm 13, and a surface protective layer 15 coated on the outer surface of the intermediate buffer layer 14 away from the base diaphragm 13.

[0039] This easily disassembled chemical variable frequency vacuum pump structure is constructed by disposing first and second diaphragm assemblies 3 on both sides of the pump body 1. The first and second diaphragm assemblies 3 are connected vertically through a discharge pipe 4 and a feed pipe 5. The diaphragm assemblies are embedded in a mounting shell 6 with a flange 7 and fixed with removable fasteners, making them easy to disassemble and maintain. A variable frequency drive device 8 in the pump body 1 drives the diaphragm assembly to reciprocate, achieving the suction and discharge of chemical media. The diaphragm sheet 9 of the diaphragm assembly adopts a multi-layer structure consisting of a base diaphragm 13, an intermediate buffer layer 14, and a surface protective layer 15. The intermediate buffer layer 14 can enhance the buffering performance, and the surface protective layer 15 can improve the resistance to chemical corrosion and extend the service life of the diaphragm. The design of the air chamber 12, in conjunction with the variable frequency drive, can accurately control the medium delivery. The overall structure is easy to disassemble and assemble, highly corrosion-resistant, and suitable for the efficient delivery of chemical media.

[0040] The base diaphragm 13 can be made of engineering plastics (such as PEEK) or metal alloys (such as titanium alloy) that have both strength and certain elasticity to withstand stress and maintain shape; the intermediate buffer layer 14 needs to use highly elastic materials such as fluororubber, EPDM rubber, silicone or polyurethane, using its elastic deformation to absorb the impact force during reciprocating motion and reduce vibration wear.

[0041] The surface protection layer 15 is a polyurethane coating or a ceramic coating, which protects the diaphragm 9 from erosion and wear by chemical media, thereby improving the reliability and stability of the diaphragm 9.

[0042] When the surface protective layer 15 is a polyurethane coating or a ceramic coating, dual protection of the diaphragm 9 can be achieved through the material properties: the polyurethane coating has high elasticity and wear resistance, can maintain flexible deformation under chemical medium erosion, and reduce the tearing and wear caused by reciprocating motion. At the same time, its molecular structure has good tolerance to most acid, alkali and oil media, and is suitable for working conditions containing trace particles or moderate corrosion; ceramic coating (such as aluminum oxide and zirconium oxide) has super-hard wear resistance as its core advantage, with a hardness of up to HRC80, which can resist the erosion and wear of media containing solid particles. It is also extremely chemically inert and can withstand strong acids, strong alkalis and high temperature environments, and is particularly suitable for extreme scenarios with strong corrosion and high wear. Both are evenly attached to the surface of the diaphragm 9 through a coating process, forming a protective barrier to isolate the chemical medium and improving the wear resistance of the diaphragm 9 through the mechanical properties of the material itself, thereby significantly extending its service life and ensuring the reliability and stability of the vacuum pump under complex working conditions.

[0043] The variable frequency drive device 8 includes a servo motor 16, an eccentric wheel mechanism 17 and a connecting rod assembly 18. The two ends of the connecting rod assembly 18 are respectively hinged to the first diaphragm assembly 2 and the second diaphragm assembly 3, and the rotational motion of the motor is converted into a linear reciprocating motion of the diaphragm 9 through the eccentric wheel.

[0044] The variable frequency drive device 8 converts the rotational motion into the linear reciprocating motion of the diaphragm 9 through the coordinated operation of the servo motor 16, the eccentric wheel mechanism 17 and the connecting rod assembly 18: the servo motor 16 can accurately adjust the speed and torque, and cooperate with the eccentric distance design of the eccentric wheel in the eccentric wheel mechanism 17 to make the rotational motion produce radial displacement changes, and then through the hinge structure of the two ends of the connecting rod assembly 18 and the first and second diaphragm assemblies 3, the circular motion of the eccentric wheel is synchronously transmitted to the reverse linear reciprocating motion of the diaphragms 9 on both sides; this design utilizes the mechanical transmission characteristics of the eccentric wheel, which not only realizes the conversion of the motion form, but also can adjust the speed of the servo motor 16 by frequency conversion, flexibly control the reciprocating frequency of the diaphragm 9, and then accurately adjust the suction flow and pressure of the vacuum pump. At the same time, the symmetrical structure of the double-sided connecting rod hinge can balance the lateral force in the movement, reduce the wear of the diaphragm assembly, and improve the stability and transmission efficiency of the drive system.

[0045] The diaphragm 9 is provided with a first boss 19, the diaphragm cover 11 is provided with a second boss 21, the first boss 19 is provided with a first through hole 22, and the second boss 21 is provided with a second threaded hole 23. A third through hole 24 is provided on the flange 7 of the edge of the mounting shell 6. The fastener passes through the third through hole 24 and the first through hole 22 in sequence and is threadedly connected to the second threaded hole 23, so that the flange 7 of the mounting shell 6 and the second boss 21 of the diaphragm cover 11 jointly clamp the first boss 19 of the diaphragm 9; a first sealing ring groove 25 is provided between the contact surfaces of the first boss 19 and the second boss 21, and a second sealing ring groove 26 is provided between the contact surfaces of the flange 7 of the mounting shell 6 and the second boss 21 of the diaphragm cover 11. Corrosion-resistant sealing elements are installed in the first sealing ring groove 25 and the second sealing ring groove 26; the depth of the first sealing ring groove 25 and the second sealing ring groove 26 is 70%-80% of the cross-sectional diameter of the sealing element to ensure sufficient compression rate after installation.

[0046] Both the first boss 19 and the second boss 21 are provided with a first sealing ring groove 25, which jointly clamp the corrosion-resistant sealing element. Both the flange 7 and the second boss 21 are provided with a second sealing ring groove 26, which jointly clamp the corrosion-resistant sealing element.

[0047] The structure achieves reliable connection and leakage prevention through boss clamping and double sealing design: the first boss 19 of the diaphragm 9 and the second boss 21 of the diaphragm cover 11 form a clamping structure through a fastener (which passes through the third through hole 24 of the flange 7 of the mounting shell 6, the first through hole 22 of the first boss 19, and is then threadedly connected to the second threaded hole 23 of the second boss 21), which facilitates disassembly and provides mechanical fastening force; the contact surface between the first boss 19 and the second boss 21 is provided with a first sealing ring groove 25, and the flange 7 of the mounting shell 6 and the second boss 21 of the diaphragm cover 11 are connected to each other. A second sealing ring groove 26 is provided on the contact surface, and corrosion-resistant sealing elements (such as fluororubber O-rings) are installed in the two grooves, and the groove depth is designed to be 70%-80% of the cross-sectional diameter of the sealing element (such as a 5mm diameter element corresponds to a 3.5-4mm groove depth), ensuring that the sealing element obtains a sufficient compression rate to produce elastic deformation, forming a double sealing barrier, which not only prevents chemical media from leaking from the junction of the diaphragm 9 and the diaphragm cover 11, but also blocks the overflow of the medium or the intrusion of external impurities. It is suitable for scenes with high requirements on sealing and corrosion resistance such as chemical and pharmaceutical industries.

[0048] A lubricating oil chamber 28 is provided in the pump body 1 , and the connecting rod assembly 18 is provided in the lubricating oil chamber 28 . The lubricating oil chamber 28 is installed on the outside of the connecting rod assembly 18 via a sealing structure.

[0049] This design achieves efficient lubrication and protection of the connecting rod assembly 18 through the combination of the lubricating oil chamber 28 and the sealing structure: an independent lubricating oil chamber 28 is set in the pump body 1, which completely encapsulates the connecting rod assembly 18. The lubricating oil chamber 28 is tightly fitted to the outside of the connecting rod assembly 18 through structures such as mechanical seals, lip seals or labyrinth seals to form a closed lubrication system; the lubricating oil circulates in the cavity, which can not only reduce the friction resistance at the hinges of the connecting rod assembly 18 (such as the hinge points between the eccentric wheel and the connecting rod, and the connecting rod and the diaphragm assembly), reduce wear and improve transmission efficiency, but also absorb the heat generated by the movement to prevent the degradation of material properties due to temperature increase; the sealing structure effectively blocks external chemical media from invading the lubricating oil chamber 28, avoids the lubricating oil from being contaminated or emulsified, and prevents the lubricating oil from leaking and contaminating other components of the pump body 1 or process media. It is especially suitable for scenarios where highly corrosive and high-purity media are transported. The synergistic effect of lubrication and protection extends the service life of the connecting rod assembly 18, ensuring long-term and stable operation of the vacuum pump.

[0050] The discharge pipe 4 is provided with a first one-way valve 29, and the feed pipe 5 is provided with a second one-way valve 31. The one-way valve includes a spherical seat 32 connected to the discharge pipe 4 and the feed pipe 5. The spherical seat 32 forms a spherical chamber 33. A sphere 34 and an elastic component for driving the sphere 34 to reset are movably provided in the spherical chamber 33. The sphere 34 can move in the spherical chamber 33 to drive the elastic component to elastically deform, so as to realize the one-way conduction function and prevent the chemical medium from flowing back.

[0051] The elastic component (such as a spring) is generally located downstream of the ball 34. When the fluid flows in the forward direction, the ball 34 is pushed away from the valve seat (inlet side) by the pressure, compressing the elastic component; when the fluid stops or reverses, the elastic component pushes the ball 34 back to the valve seat (inlet side) through elastic deformation, achieving sealing and preventing backflow.

[0052] This design achieves one-way flow of chemical media by installing first and second one-way valves 31 in the discharge pipe 4 and feed pipe 5, respectively, and utilizing the cooperation of a spherical seat 32 and a ball 34. The one-way valve's spherical seat 32 connects to the pipe and forms a spherical chamber 33. The ball 34 in the chamber can roll freely. When the medium flows forward, pressure pushes the ball 34 away from the valve seat, opening the flow channel. When the medium flows back, the pressure on the ball 34 presses against the sealing surface of the spherical seat 32, blocking the reverse flow path. For example, in the discharge pipe 4, when the diaphragm assembly is squeezed, the medium pushes the ball 34 to open the channel for discharge. When the pump body 1 is pumping, the ball 34 falls back to seal and prevent the medium from flowing back. In the feed pipe 5, during the suction phase, the ball 34 is sucked open, allowing the medium to flow in. During the extrusion phase, the ball 34 seals and prevents the medium from flowing back. This structure uses the mechanical principle of the rolling of the ball 34 to achieve energy-free one-way control, and the contact area between the spherical sealing surface and the medium is uniform, and the sealing reliability is high. At the same time, the material of the ball 34 and the spherical seat 32 can be selected from corrosion-resistant stainless steel, PTFE or ceramic, which is suitable for highly corrosive media, effectively preventing the backflow of chemical media, and ensuring the delivery efficiency and stability of the pump body 1.

[0053] The pump body 1 is provided with a first pressure regulating assembly 35 and a second pressure regulating assembly 36. The first pressure regulating assembly 35 is connected to the first diaphragm assembly 2, and the second pressure regulating assembly 36 is connected to the second diaphragm assembly 3. The first pressure regulating assembly 35 and the second pressure regulating assembly 36 respectively regulate the air pressure in the air chamber 12 of the first diaphragm assembly 2 and the air chamber 12 of the second diaphragm assembly 3.

[0054] The first pressure regulating assembly 35 and the second pressure regulating assembly 36 both include a pressure regulating tube body 37 and a pressure regulating driving member 38 connected to the pressure regulating tube body 37. The end of the pressure regulating tube body 37 away from the pressure regulating driving member 38 is connected to the air chamber 12; an air pressure detection gauge 39 is also provided on the outside of the pump body 1.

[0055] This design achieves precise pressure control by setting independent first and second pressure regulating components 36 in the pump body 1, which are respectively connected to the air chambers 12 of the diaphragm components on both sides, and cooperate with the external air pressure detection gauge 39: the pressure regulating component uses a pressure regulating tube body 37 to connect the pressure regulating driver 38 (such as an electric servo valve or a pneumatic proportional valve) and the air chamber 12. The driver dynamically adjusts the air pressure of the air chamber 12 according to the feedback from the detection gauge (such as replenishing air when the pressure is insufficient and releasing pressure when the pressure is too high), which can compensate for the pressure imbalance caused by diaphragm wear or changes in medium characteristics, and improve the operating stability of the pump body 1; the pressure regulating tube body 37 is made of corrosion-resistant material (such as stainless steel or PTFE), with an inner diameter of 10-20mm to ensure smooth airflow, and cooperates with a high-precision driver (accuracy of ±0.5kPa) to achieve a pressure control error within ±1.5%. The external air pressure detection gauge 39 (range 0-200kPa, accuracy level 1.6) provides visual monitoring. The overall design significantly extends the life of the diaphragm (up to 12 times or more than that of an ordinary pump body 1), which is particularly suitable for high-viscosity or corrosive medium transportation scenarios.

[0056] The pressure regulating drive component 38 is a stepping motor, and a spiral channel 41 is provided in the pressure regulating tube body 37. The spiral channel 41 is used to slow down the rate of change of air pressure between the air chamber 12 and the external environment to achieve smooth regulation of the air pressure; the pitch of the spiral channel 41 gradually decreases from the air inlet end of the pressure regulating tube body 37 to the connecting end of the air chamber 12, forming a nonlinear air pressure buffer gradient.

[0057] As gas passes through spiral channel 41, the reduced pitch compresses the channel volume, lengthens the flow path, and increases the frequency of gas molecule collisions, creating dynamic resistance. This resistance increases nonlinearly with the direction of gas propulsion (from the inlet end to the end of chamber 12), causing the rate of change of air pressure to exhibit a "fast at the beginning and slow at the end" decay characteristic. This avoids the sudden pressure changes or regulation lags caused by the constant resistance of traditional linear channels. As the target pressure is approached, the high resistance at the end of the channel further slows the rate of pressure change, preventing pressure overshoot caused by stepper motor control errors and improving system stability.

[0058] The lower end of the spherical seat 32 is the inlet end, and the upper end of the spherical seat 32 is the outlet end. Both the inlet end and the outlet end are provided with a conical guide port 42. The cone angle of the guide port at the inlet end is 30-45 degrees, and the cone angle of the guide port at the outlet end is 15-25 degrees.

[0059] The large cone angle (30-45°) at the inlet end reduces the turbulence of the medium when it enters, and the small cone angle (15-25°) at the outlet end guides the fluid to discharge smoothly, reduces pressure loss, and improves the flow capacity of the one-way valve. The large cone angle design forms a gradually expanding flow channel, which reduces the sudden change in flow velocity when the medium enters the spherical seat 32, reduces turbulence and pressure loss, and is especially suitable for high-viscosity or particle-containing media to avoid accumulation or blockage of the medium at the inlet. Expanding the inlet cross-section can disperse the impact force of the medium on the sphere 34, extend the service life of the sphere 34 and the spherical seat 32, and the effect is particularly significant under high-pressure difference conditions. The small cone angle design forms a gradually contracting flow channel, which has a rectifying effect on the discharged medium, reduces eddy currents and energy dissipation at the outlet, and improves the circulation efficiency of the one-way valve.

[0060] The rest of this embodiment is the same as that of the first embodiment. The features not explained in this embodiment are all based on the explanations of the first embodiment and will not be described in detail here.

[0061] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A chemical variable frequency vacuum pump structure that can be easily disassembled and assembled, characterized by: The invention comprises a pump body (1), a first diaphragm assembly (2) and a second diaphragm assembly (3) respectively arranged on both sides of the pump body (1); the first diaphragm assembly (2) and the second diaphragm assembly (3) are connected to each other through a discharge pipe (4) at the top and a feed pipe (5) at the bottom; a mounting shell (6) is respectively provided on both sides of the pump body (1), and a flange (7) is provided on the edge of the mounting shell (6); the first diaphragm assembly (2) and the second diaphragm assembly (3) are respectively installed in the mounting shell (6) on both sides of the pump body (1) and fixedly connected to the mounting shell (6) through a detachable fastener; a variable frequency drive device (8) is provided in the pump body (1), and the variable frequency drive device (8) is connected to the first diaphragm assembly (2) and the second diaphragm assembly (3) respectively, and the variable frequency drive device (8) is used to drive the first diaphragm assembly (2) and the second diaphragm assembly (3) to perform reciprocating motion to realize the suction and discharge of the chemical medium; The diaphragm assembly comprises a diaphragm sheet (9) connected to a variable frequency drive device (8), a diaphragm cover (11) mounted on the diaphragm sheet (9), the diaphragm cover (11) and the diaphragm sheet (9) together forming an air chamber (12), the diaphragm sheet (9) comprising a multi-layer diaphragm structure, the diaphragm sheet (9) comprising a base diaphragm (13), an intermediate buffer layer (14) arranged on both sides of the base diaphragm (13), and a surface protective layer (15) coated on the outer surface of the intermediate buffer layer (14) away from the base diaphragm (13).

2. The easily detachable chemical variable frequency vacuum pump structure according to claim 1, characterized in that: The surface protection layer (15) is a polyurethane coating or a ceramic coating, which protects the diaphragm (9) from erosion and wear by chemical media, thereby improving the reliability and stability of the diaphragm (9).

3. The easily detachable chemical variable frequency vacuum pump structure according to claim 1, characterized in that: The variable frequency drive device (8) comprises a servo motor (16), an eccentric wheel mechanism (17) and a connecting rod assembly (18). The two ends of the connecting rod assembly (18) are respectively hinged to the first diaphragm assembly (2) and the second diaphragm assembly (3). The eccentric wheel converts the rotational motion of the motor into the linear reciprocating motion of the diaphragm (9).

4. The easily detachable chemical variable frequency vacuum pump structure according to claim 1, characterized in that: The diaphragm (9) is provided with a first boss (19), the diaphragm cover (11) is provided with a second boss (21), the first boss (19) is provided with a first through hole (22), the second boss (21) is provided with a second threaded hole (23), the flange (7) at the edge of the mounting shell (6) is provided with a third through hole (24), the fastener passes through the third through hole (24) and the first through hole (22) in sequence and is threadedly connected to the second threaded hole (23), so that the flange (7) of the mounting shell (6) and the second boss (21) of the diaphragm cover (11) jointly clamp the diaphragm (9) A first sealing ring groove (25) is provided between the contact surfaces of the first boss (19) and the second boss (21); a second sealing ring groove (26) is provided between the contact surface of the flange (7) of the mounting shell (6) and the second boss (21) of the diaphragm cover (11); corrosion-resistant sealing elements are installed in the first sealing ring groove (25) and the second sealing ring groove (26); the depth of the first sealing ring groove (25) and the second sealing ring groove (26) is 70%-80% of the cross-sectional diameter of the sealing element to ensure a sufficient compression rate after installation.

5. The easily detachable chemical variable frequency vacuum pump structure according to claim 3, characterized in that: A lubricating oil cavity (28) is provided in the pump body (1), the connecting rod assembly (18) is arranged in the lubricating oil cavity (28), and the lubricating oil cavity (28) is installed on the outside of the connecting rod assembly (18) via a sealing structure.

6. The easily detachable chemical variable frequency vacuum pump structure according to claim 1, characterized in that: The discharge pipe (4) is provided with a first one-way valve (29), and the feed pipe (5) is provided with a second one-way valve (31). The one-way valve includes a spherical seat (32) connected to the discharge pipe (4) and the feed pipe (5). The spherical seat (32) forms a spherical chamber (33). A spherical body (34) and an elastic component for driving the spherical body (34) to reset are movably provided in the spherical chamber (33). The spherical body (34) can move in the spherical chamber (33) to drive the elastic component to elastically deform, thereby realizing a one-way conduction function and preventing the chemical medium from flowing back.

7. The easily detachable chemical variable frequency vacuum pump structure according to claim 1, characterized in that: A first pressure regulating assembly (35) and a second pressure regulating assembly (36) are provided in the pump body (1); the first pressure regulating assembly (35) is connected to the first diaphragm assembly (2), and the second pressure regulating assembly (36) is connected to the second diaphragm assembly (3); the first pressure regulating assembly (35) and the second pressure regulating assembly (36) respectively regulate the air pressure in the air chamber (12) of the first diaphragm assembly (2) and the air chamber (12) of the second diaphragm assembly (3).

8. The easily detachable chemical variable frequency vacuum pump structure according to claim 7, characterized in that: The first pressure regulating assembly (35) and the second pressure regulating assembly (36) both comprise a pressure regulating tube body (37) and a pressure regulating driving member (38) connected to the pressure regulating tube body (37); one end of the pressure regulating tube body (37) away from the pressure regulating driving member (38) is in communication with the air chamber (12); and an air pressure detection gauge (39) is also provided on the outside of the pump body (1).

9. The easily detachable chemical frequency conversion vacuum pump structure according to claim 8, characterized in that: The pressure regulating drive member (38) is a stepping motor. A spiral channel (41) is provided in the pressure regulating tube body (37). The spiral channel (41) is used to slow down the rate of change of air pressure between the air chamber (12) and the external environment, thereby achieving smooth regulation of air pressure. The pitch of the spiral channel (41) gradually decreases from the air inlet end of the pressure regulating tube body (37) to the connecting end of the air chamber (12), thereby forming a nonlinear air pressure buffer gradient.

10. The easily detachable chemical frequency conversion vacuum pump structure according to claim 6, characterized in that: The lower end of the spherical seat (32) is the inlet end, and the upper end of the spherical seat (32) is the outlet end. Both the inlet end and the outlet end are provided with a conical guide port (42). The cone angle of the guide port at the inlet end is 30-45 degrees, and the cone angle of the guide port at the outlet end is 15-25 degrees.

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