Double-diaphragm-piece structure of chemical-corrosion-resistant diaphragm vacuum pump

Abstract

According to the technical scheme, the double-diaphragm-piece structure of the chemical-corrosion-resistant diaphragm vacuum pump is characterized in that the double-diaphragm-piece structure comprises a machine shell, a first installation hole is formed in one side of the interior of the machine shell, a bearing is fixedly installed in the first installation hole, a motor is fixedly installed on one side of the machine shell, and the motor is fixedly installed on the other side of the machine shell; a rotating shaft of the motor is fixedly installed on the inner circular wall of the bearing inner ring, a crankshaft is fixedly installed at one end of the rotating shaft of the motor, the outer circular wall of the crankshaft is movably sleeved with two connecting rods, and one end of each connecting rod is provided with a first threaded groove; the double-diaphragm-piece assembly is used for protecting transmitted gas from leaking, the machine shell, the supporting frame of an integral structure and the bearing are arranged to reduce friction resistance of the rotating shaft in the rotating process, the crankshaft enables the two connecting rods to reciprocate, and the double-diaphragm-piece assembly effectively prevents gas leakage while guaranteeing smooth transmission of the gas. And a bearing in the vacuum pump is protected from being eroded by corrosive gas.

Description

Technical Field

[0001] The present invention relates to the technical field of the double diaphragm structure of a chemically resistant diaphragm vacuum pump, and specifically relates to a double diaphragm structure of a chemically resistant diaphragm vacuum pump. Background Art

[0002] In multiple fields such as medical treatment, nuclear energy, and radiation processing, the transmission of special gases faces extremely high requirements. In the medical field, anesthetic gases in the anesthesiology department, such as sevoflurane and isoflurane, are corrosive and toxic, and their precise delivery and recovery are crucial for the smooth progress of surgeries and the safety of patients. The operation of medical devices such as ventilators and oxygen generators also relies on a reliable gas transmission system. In the nuclear energy field, gases containing radioactive substances are generated during the production, processing, and research of nuclear materials. For example, gases containing radioactive nuclides such as iodine, krypton, and xenon are generated during the operation of nuclear reactors in nuclear power plants. Once leaked, the consequences are serious. In the radiation processing industry, radioactive gases generated during the treatment of materials using radiation sources have both corrosiveness and radiation hazards.

[0003] The traditional double diaphragm structure of a chemically resistant diaphragm vacuum pump only has a single working diaphragm. Due to the complex and changeable working environment, the working diaphragm is in a harsh chemical corrosion environment for a long time and is affected by various factors such as continuous erosion by corrosive gases, friction of mechanical movement, and possible abnormal working conditions. Inevitably, the working diaphragm will be damaged. After the diaphragm is damaged, the corrosive gas will enter the bearing, resulting in phenomena such as corrosion pits and rust on the bearing surface, thereby affecting the accuracy and running flexibility of the bearing.

[0004] The present invention adopts a double diaphragm, namely a working diaphragm and a protective diaphragm, one layer of working diaphragm and one layer of protective diaphragm. The working diaphragm adopts a PTFE composite diaphragm, which has sufficient elasticity to ensure reciprocating movement up and down. The protective diaphragm is a rigid PTFE diaphragm, which is used to prevent the leakage of transmitted gas and the corrosion of the bearing when the working diaphragm is damaged after long-term operation. It is especially suitable for application in harsh working conditions of biochemical gas suction and the transmission of special gases, such as medical gases, nuclear substances, radiation gases, etc. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a double diaphragm structure of a chemically resistant diaphragm vacuum pump, which solves the problems mentioned in the background art.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A double diaphragm structure for a chemically resistant diaphragm vacuum pump, comprising: a housing, a first mounting hole is provided on one side inside the housing, a bearing is fixedly installed inside the first mounting hole, a motor is fixedly installed on one side of the housing, a rotating shaft of the motor is fixedly installed on the inner circumferential wall of the inner ring of the bearing, a crankshaft is fixedly installed at one end of the rotating shaft of the motor, two connecting rods are movably sleeved on the outer circumferential wall of the crankshaft, and first threaded grooves are respectively provided at one ends of the two connecting rods; a double diaphragm assembly, the two double diaphragm assemblies are respectively arranged at one ends of the two connecting rods, and are used to prevent the transmitted gas from leaking. When in use, after the motor is powered on, it starts to operate, and its rotating shaft rotates accordingly. The rotational power of the motor is transmitted to the crankshaft through the rotating shaft. The crankshaft converts the rotational motion into a linear reciprocating motion. The two connecting rods perform a reciprocating linear motion driven by the crankshaft. The first threaded groove at one end of the connecting rod is connected to the double diaphragm assembly, and the motion is transmitted to the double diaphragm assembly. The double diaphragm assembly starts to work under the drive of the connecting rod.

[0008] By adopting the above technical solution, by setting the housing, it is the support frame of the overall structure. The first mounting hole is used to install the bearing, and the bearing reduces the frictional resistance of the rotating shaft during rotation. The motor is the power source of the vacuum pump. The crankshaft enables the two connecting rods to perform synchronous but opposite-direction reciprocating motions driven by the crankshaft. The first threaded groove is used for reliable connection with the threaded rod in the double diaphragm assembly. While ensuring the smooth transmission of gas, the double diaphragm assembly effectively prevents gas leakage and protects the internal bearing of the vacuum pump from being eroded by corrosive gases.

[0009] Preferably, the double diaphragm assembly includes: two black PTFE-coated gland covers, the two black PTFE-coated gland covers are respectively arranged at one ends of the two connecting rods, threaded rods are respectively fixedly installed on one sides of the two black PTFE-coated gland covers, PTFE composite working diaphragm sheets are respectively arranged on one sides of the two black PTFE-coated gland covers, first round holes are respectively fixedly installed on one sides of the two PTFE composite working diaphragm sheets, the first round holes are movably sleeved with the threaded rods, PTFE protection diaphragm sheets are respectively arranged on one sides of the two PTFE composite working diaphragm sheets, second round holes are respectively provided on one sides of the two PTFE protection diaphragm sheets, and the second round holes are movably sleeved with the threaded rods.

[0010] By adopting the above technical solutions, by setting the black PTFE-coated gland, it can effectively resist the erosion of corrosive components in special gases such as biochemical gases, medical gases, nuclear substances, and radiation gases. By cooperating with the nut, components such as the PTFE composite working diaphragm and the PTFE protective diaphragm are tightly fixed, making the double diaphragm assembly an integral whole that works together. The PTFE composite working diaphragm creates a pressure difference by changing the volume of the diaphragm cavity to achieve the inhalation and discharge of gases, ensuring the stable operation of the vacuum pump. When the PTFE composite working diaphragm is damaged due to chemical corrosion, mechanical fatigue, etc. during long-term operation, the PTFE protective diaphragm can quickly prevent the transmitted gas from leaking into other areas inside the vacuum pump and prevent corrosive gases from entering key components such as bearings. The threaded rod connects the components in series to form a complete double diaphragm assembly structure.

[0011] Preferably, the double diaphragm assembly further includes: two metal gaskets. The two metal gaskets are respectively arranged on one side of the PTFE protective diaphragm. Third round holes are respectively formed on one side of the two metal gaskets. The third round holes are movably sleeved on the threaded rod. Nuts are respectively arranged on one side of the two metal gaskets. The nuts are threadedly connected to the threaded rod. The threaded rod is threadedly connected to the first thread groove.

[0012] By adopting the above technical solutions, by setting the metal gasket between the PTFE protective diaphragm and the nut, when the nut is tightened, due to its good rigidity and flatness, the metal gasket can evenly disperse the pressure applied by the nut to the contact surface of the PTFE protective diaphragm, preventing the PTFE protective diaphragm from being damaged due to pressure concentration in a local area. By tightening the nut, the black PTFE-coated gland, the PTFE composite working diaphragm, the PTFE protective diaphragm, and the metal gasket can be tightly fixed together to form an integral double diaphragm assembly, which is also convenient for disassembly and replacement.

[0013] Preferably, placing holes are respectively formed on both sides of the housing. The two PTFE protective diaphragms are respectively movably sleeved inside the two placing holes. The two PTFE composite working diaphragms are respectively movably sleeved inside the two placing holes.

[0014] By adopting the above technical solutions, by setting the placing holes, it provides a specific moving space for the PTFE protective diaphragm and the PTFE composite working diaphragm, restricts the moving direction of the diaphragm, ensures that the diaphragm can only reciprocate along the predetermined axial direction, and realizes the stable gas suction and compression functions.

[0015] Preferably, four second threaded grooves are formed on one side of the housing, a cover plate is arranged on one side of the housing, four first insertion holes are formed on one side of the cover plate, four first bolts are arranged on one side of the cover plate, and the first bolts penetrate through the first insertion holes and are in threaded connection with the second threaded grooves.

[0016] By adopting the above technical solution, by arranging the cover plate, when the first bolts are tightened, the cover plate and the housing are closely attached to each other to form a good seal, protecting the internal components, which can block accidental collisions, impacts or damages of external objects to the internal components, reducing the risk of equipment failure caused by external factors. The four second threaded grooves correspond to the four first insertion holes on the cover plate. The cover plate is firmly fixed on the housing by the first bolts penetrating through the first insertion holes and being in threaded connection with the second threaded grooves.

[0017] Preferably, a plurality of third threaded grooves are formed on one side of the housing, a first pump head is arranged on one side of the housing, a plurality of second insertion holes are formed on one side of the first pump head, a plurality of second bolts are arranged on one side of the first pump head, the second bolts penetrate through the second insertion holes and are in threaded connection with the third threaded grooves, a first intake pipe is fixedly installed at the air inlet of the first pump head, and a first outlet pipe is fixedly installed at the air outlet of the first pump head.

[0018] By adopting the above technical solution, by arranging the third threaded grooves, the plurality of third threaded grooves on the housing correspond to the plurality of second insertion holes on one side of the first pump head. The first pump head is accurately installed and positioned on the housing by the second bolts penetrating through the second insertion holes and being in threaded connection with the third threaded grooves, ensuring that the relative position between the first pump head and the housing is accurate and error-free, guaranteeing the precise fit between the internal structure of the first pump head and the double diaphragm assembly in the housing, so that during the operation of the vacuum pump, gas can flow smoothly between the components along the designed path. The first intake pipe, as the inlet channel for external gas to enter the first pump head, is fixedly installed at the air inlet of the first pump head, ensuring that gas can be stably and smoothly sucked into the first pump head. During the operation of the vacuum pump, the movement of the double diaphragm assembly forms a negative pressure in the first pump head, and external gas is continuously sucked into the first pump head through the first intake pipe, providing a gas source for the subsequent gas treatment process.

[0019] Preferably, a plurality of fourth threaded grooves are formed on one side of the housing, a second pump head is arranged on one side of the housing, a plurality of third insertion holes are formed on one side of the second pump head, a plurality of third bolts are arranged on one side of the second pump head, the third bolts penetrate through the third insertion holes and are in threaded connection with the fourth threaded grooves, a second intake pipe is fixedly installed at the air inlet of the second pump head, and a second outlet pipe is fixedly installed at the air outlet of the second pump head.

[0020] By adopting the above technical solution, by setting the fourth thread groove, a plurality of fourth thread grooves on the casing cooperate with a plurality of third jacks on one side of the second pump head. The third bolt passes through the third jack and is threadedly connected to the fourth thread groove, realizing the precise positioning and installation of the second pump head on the casing. The second intake pipe is fixedly installed at the intake port of the second pump head and is the passage for gas to enter the second pump head. It works together with the outlet of the first pump head, the connecting pipe, etc. to construct a circulating or specific transmission path of gas in the vacuum pump. After being processed by the first pump head, the gas enters the second intake pipe through the connecting pipe, then enters the second pump head for further processing, and the second outlet pipe is responsible for discharging the gas processed by the second pump head to the next link or the external environment, ensuring the continuous flow of gas in the vacuum pump system.

[0021] Preferably, a plurality of brackets are fixedly installed at the bottom of the casing, and a connecting pipe is fixedly installed at the bottom of the plurality of brackets. One end of the first intake pipe is movably sleeved with one end of the connecting pipe, and one end of the second outlet pipe is movably sleeved with the other end of the connecting pipe.

[0022] By adopting the above technical solution, by setting the brackets to fix the connecting pipe and prevent the connecting pipe from falling off. During the operation of the vacuum pump, gas enters the system from the outside through the first intake pipe. After being processed by components such as the first pump head and the second pump head, it is discharged through the second outlet pipe. The connecting pipe plays a role of connection and transition, ensuring that the gas can flow smoothly between the components along the predetermined path.

[0023] Preferably, an overheat protection capacitor is fixedly installed on the outer wall of the motor. A power switch is fixedly installed on the top of the overheat protection capacitor. A first anti-slip pad is fixedly installed at the bottom of the motor. Four second anti-slip pads are fixedly installed at the bottom of the casing. A handle is fixedly installed on the top of the casing.

[0024] By adopting the above technical solution, by setting the overheat protection capacitor to monitor the temperature during the operation of the motor in real time. When the motor becomes overheated due to long-term operation or other reasons, the power circuit of the motor is cut off to stop the motor from running. The first anti-slip pad and the second anti-slip pad provide reliable anti-slip support for the entire vacuum pump on the placement plane, and the handle enables the operator to easily carry and move the vacuum pump.

[0025] In summary, the present invention mainly has the following beneficial effects:

[0026] A housing is provided, which is the support framework of the overall structure. The first mounting holes are used for mounting bearings, which reduce the frictional resistance of the rotating shaft during rotation and are the power source of the motor vacuum pump. The crankshaft enables the two connecting rods to perform synchronous but opposite reciprocating motions driven by the crankshaft. The first threaded groove is used for reliable connection with the threaded rod in the double diaphragm assembly, and the double diaphragm assembly prevents gas leakage. A black PTFE-coated gland is provided. By cooperating with the nut, components such as the PTFE composite working diaphragm and the PTFE protective diaphragm are tightly fixed, making the double diaphragm assembly an integrated unit that works together. The PTFE composite working diaphragm creates a pressure difference by changing the volume of the diaphragm cavity to achieve the inhalation and discharge of gas. When the PTFE composite working diaphragm is damaged due to chemical corrosion, mechanical fatigue, etc. during long-term operation, the PTFE protective diaphragm can quickly prevent the transmitted gas from leaking into other areas inside the vacuum pump. The threaded rod connects the components into a complete double diaphragm assembly structure. A metal gasket is provided and is located between the PTFE protective diaphragm and the nut. When the nut is tightened, due to its good rigidity and flatness, the metal gasket can evenly disperse the pressure applied by the nut to the contact surface of the PTFE protective diaphragm. By tightening the nut, the black PTFE-coated gland, the PTFE composite working diaphragm, the PTFE protective diaphragm, and the metal gasket can be tightly fixed together.

[0027] A placement hole is provided, which provides a specific movement space for the PTFE protective diaphragm and the PTFE composite working diaphragm. A cover plate is provided. When the first bolt is tightened, the cover plate fits tightly with the housing to protect the internal components. Four second threaded grooves correspond to four first jacks on the cover plate, and the cover plate is firmly fixed to the housing through the first bolt. A third threaded groove is provided. A number of third threaded grooves on the housing correspond to a number of second jacks on one side of the first pump head, and the first pump head is accurately installed and positioned on the housing through the second bolt. The first intake pipe is the inlet channel for external gas to enter the first pump head and is fixedly installed on the intake port of the first pump head. A fourth threaded groove is provided. A number of fourth threaded grooves on the housing cooperate with a number of third jacks on one side of the second pump head, and the second pump head is accurately positioned and installed on the housing through the third bolt. The second intake pipe is fixedly installed on the intake port of the second pump head and is the channel for gas to enter the second pump head. A bracket is provided to fix the connecting pipe and prevent the connecting pipe from falling off. The connecting pipe plays a role of connection and transition. An overheat protection capacitor is provided. When the motor temperature is too high due to long-term operation or other reasons, the power circuit of the motor is cut off. The first anti-slip pad and the second anti-slip pad provide reliable anti-slip support for the entire vacuum pump on the placement plane, and the handle enables the operator to easily carry and move the vacuum pump. Description of the Drawings

[0028] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0029] Figure 2 is a schematic structural view of the casing of the present invention;

[0030] Figure 3 is a schematic cross-sectional structural view of the casing of the present invention;

[0031] Figure 4 is a schematic structural view of the first pump head of the present invention;

[0032] Figure 5 is a schematic structural view of the second pump head of the present invention;

[0033] Figure 6 is a schematic structural view of the double diaphragm assembly of the present invention.

[0034] Reference numerals: 1, casing; 2, motor; 3, first mounting hole; 4, bearing; 5, crankshaft; 6, connecting rod; 7, first thread groove; 8, black PTFE coating gland; 9, threaded rod; 10, PTFE composite working diaphragm; 11, first round hole; 12, PTFE protective diaphragm; 13, second round hole; 14, metal gasket; 15, third round hole; 16, nut; 17, handle; 18, placement hole; 19, second thread groove; 20, cover plate; 21, first jack; 22, first bolt; 23, third thread groove; 24, first pump head; 25, second jack; 26, second bolt; 27, first intake pipe; 28, first outlet pipe; 29, fourth thread groove; 30, second pump head; 31, third jack; 32, third bolt; 33, second intake pipe; 34, second outlet pipe; 35, bracket; 36, connecting pipe; 37, overheat protection capacitor; 38, power switch; 39, first anti-slip pad; 40, second anti-slip pad. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Refer to Figure 1 , Figure 3 and Figure 6, a double diaphragm structure of an anti-chemical corrosion diaphragm vacuum pump, comprising: a housing 1, a first mounting hole 3 is opened on one side inside the housing 1, a bearing 4 is fixedly installed inside the first mounting hole 3, a motor 2 is fixedly installed on one side of the housing 1, a rotating shaft of the motor 2 is fixedly installed on the inner circumferential wall of the inner ring of the bearing 4, a crankshaft 5 is fixedly installed at one end of the rotating shaft of the motor 2, two connecting rods 6 are movably sleeved on the outer circumferential wall of the crankshaft 5, and two first threaded grooves 7 are respectively opened at one ends of the two connecting rods 6; double diaphragm assemblies, two double diaphragm assemblies are respectively arranged at one ends of the two connecting rods 6, for protecting the transmitted gas from leaking out. When in use, after the motor 2 is powered on, it starts to operate, and its rotating shaft rotates accordingly. The rotating power of the motor 2 is transmitted to the crankshaft 5 through the rotating shaft. The crankshaft 5 converts the rotational motion into a linear reciprocating motion. The two connecting rods 6 perform a reciprocating linear motion driven by the crankshaft 5. The first threaded groove 7 at one end of the connecting rod 6 is connected to the double diaphragm assembly, transmitting the motion to the double diaphragm assembly. The double diaphragm assembly starts to work driven by the connecting rod 6. The housing 1 is provided as the support frame of the overall structure. The first mounting hole 3 is used to install the bearing 4. The bearing 4 reduces the frictional resistance of the rotating shaft during rotation. The motor 2 is the power source of the vacuum pump. The crankshaft 5 enables the two connecting rods 6 to perform synchronous but opposite-direction reciprocating motions driven by the crankshaft 5. The first threaded groove 7 is used for reliable connection with the threaded rod 9 in the double diaphragm assembly. While ensuring the smooth transmission of gas, the double diaphragm assembly effectively prevents gas leakage and protects the internal bearing 4 of the vacuum pump from being eroded by corrosive gases. The double diaphragm assembly includes: two black PTFE-coated gland covers 8, two black PTFE-coated gland covers 8 are respectively arranged at one ends of the two connecting rods 6, two threaded rods 9 are respectively fixedly installed on one side of the two black PTFE-coated gland covers 8, PTFE composite working diaphragm sheets 10 are respectively arranged on one side of the two black PTFE-coated gland covers 8, first round holes 11 are respectively fixedly installed on one side of the two PTFE composite working diaphragm sheets 10, the first round holes 11 are movably sleeved with the threaded rods 9, PTFE protection diaphragm sheets 12 are respectively arranged on one side of the two PTFE composite working diaphragm sheets 10, second round holes 13 are respectively opened on one side of the two PTFE protection diaphragm sheets 12, and the second round holes 13 are movably sleeved with the threaded rods 9. The black PTFE-coated gland cover 8 can effectively resist the erosion of corrosive components in special gases such as biochemical gases, medical gases, nuclear substances, and radiation gases. By cooperating with the nut 16, components such as the PTFE composite working diaphragm sheet 10 and the PTFE protection diaphragm sheet 12 are tightly fixed, making the double diaphragm assembly an integrated unit that works together. The PTFE composite working diaphragm sheet 10 creates a pressure difference by changing the volume of the diaphragm cavity, realizing the inhalation and discharge of gas, and ensuring the stable operation of the vacuum pump. When the PTFE composite working diaphragm sheet 10 is damaged due to factors such as chemical corrosion and mechanical fatigue during long-term operation,The PTFE protection diaphragm 12 can quickly prevent the transmitted gas from leaking into other areas inside the vacuum pump and prevent corrosive gases from entering key components such as the bearing 4. The threaded rod 9 connects the components in series to form a complete double-diaphragm assembly structure. The double-diaphragm assembly further includes: two metal gaskets 14. Metal gaskets 14 are respectively arranged on one side of the two PTFE protection diaphragms 12. The third round holes 15 are respectively opened on one side of the two metal gaskets 14. The third round holes 15 are movably sleeved on the threaded rod 9. Two nuts 16 are respectively arranged on one side of the two metal gaskets 14. The nuts 16 are threadedly connected to the threaded rod 9. The threaded rod 9 is threadedly connected to the first thread groove 7. The metal gasket 14 is arranged between the PTFE protection diaphragm 12 and the nut 16. When the nut 16 is tightened, due to its good rigidity and flatness, the metal gasket 14 can evenly disperse the pressure applied by the nut 16 to the contact surface of the PTFE protection diaphragm 12, preventing the PTFE protection diaphragm 12 from being damaged due to pressure concentration in a local area. By tightening the nut 16, the black PTFE coating gland 8, the PTFE composite working diaphragm 10, the PTFE protection diaphragm 12 and the metal gasket 14 can be tightly fixed together to form an integral double-diaphragm assembly, which is also convenient for disassembly and replacement;

[0037] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6, the two placement holes 18 are respectively opened on both sides of the casing 1. The two PTFE protection diaphragm sheets 12 are respectively sleeved inside the two placement holes 18 in a movable manner. The two PTFE composite working diaphragm sheets 10 are respectively sleeved inside the two placement holes 18 in a movable manner. The provision of the placement holes 18 provides a specific movement space for the PTFE protection diaphragm sheets 12 and the PTFE composite working diaphragm sheets 10, restricts the movement direction of the diaphragm sheets, and ensures that the diaphragm sheets can only reciprocate along the predetermined axial direction, realizing the stable gas suction and compression functions. Four second threaded grooves 19 are opened on one side of the casing 1. The cover plate 20 is arranged on one side of the casing 1. Four first insertion holes 21 are opened on one side of the cover plate 20. Four first bolts 22 are arranged on one side of the cover plate 20. The first bolts 22 penetrate through the first insertion holes 21 and are threadedly connected to the second threaded grooves 19. The provision of the cover plate 20, when the first bolts 22 are tightened, the cover plate 20 is closely attached to the casing 1, forming a good seal to protect the internal components, which can block the accidental collision, impact or damage of the external objects to the internal components, and reduce the risk of equipment failure caused by external factors. A number of third threaded grooves 23 are opened on one side of the casing 1. The first pump head 24 is arranged on one side of the casing 1. A number of second insertion holes 25 are opened on one side of the first pump head 24. A number of second bolts 26 are arranged on one side of the first pump head 24. The second bolts 26 penetrate through the second insertion holes 25 and are threadedly connected to the third threaded grooves 23. The first intake pipe 27 is fixedly installed at the intake port of the first pump head 24. The first outlet pipe 28 is fixedly installed at the outlet port of the first pump head 24. The provision of the third threaded grooves 23, a number of third threaded grooves 23 on the casing 1 correspond to a number of second insertion holes 25 on one side of the first pump head 24. By the second bolts 26 penetrating through the second insertion holes 25 and being threadedly connected to the third threaded grooves 23, the precise installation and positioning of the first pump head 24 on the casing 1 are realized, ensuring the accurate relative position between the first pump head 24 and the casing 1, guaranteeing the precise cooperation between the internal structure of the first pump head 24 and the double diaphragm assembly inside the casing 1, so that during the operation of the vacuum pump, the gas can flow smoothly between the components according to the designed path. The first intake pipe 27, as the inlet channel for the external gas to enter the first pump head 24, is fixedly installed at the intake port of the first pump head 24, ensuring that the gas can be stably and smoothly sucked into the first pump head 24. During the operation of the vacuum pump, the movement of the double diaphragm assembly forms a negative pressure inside the first pump head 24, and the external gas is continuously sucked into the first pump head 24 through the first intake pipe 27, providing a gas source for the subsequent gas treatment process. A number of fourth threaded grooves 29 are opened on one side of the casing 1. The second pump head 30 is arranged on one side of the casing 1. A number of third insertion holes 31 are opened on one side of the second pump head 30. A number of third bolts 32 are arranged on one side of the second pump head 30. The third bolts 32 penetrate through the third insertion holes 31 and are threadedly connected to the fourth threaded grooves 29.A second intake pipe 33 is fixedly installed at the air inlet of the second pump head 30, and a second outlet pipe 34 is fixedly installed at the air outlet of the second pump head 30. A number of fourth threaded grooves 29 are provided on the housing 1, and a number of third jacks 31 on one side of the second pump head 30 cooperate with each other. The third bolt 32 passes through the third jack 31 and is threadedly connected to the fourth threaded groove 29, realizing the precise positioning and installation of the second pump head 30 on the housing 1. The second intake pipe 33 is fixedly installed at the air inlet of the second pump head 30 and is the passage for gas to enter the second pump head 30. It works in coordination with the air outlet of the first pump head 24, the connecting pipe 36, etc., to construct a circulating or specific transmission path of gas in the vacuum pump. After the gas is processed by the first pump head 24, it enters the second intake pipe 33 through the connecting pipe 36, and then enters the second pump head 30 for further processing. The second outlet pipe 34 is responsible for discharging the gas processed by the second pump head 30 to the next link or the external environment, ensuring the continuous flow of gas in the vacuum pump system. A number of the brackets 35 are fixedly installed at the bottom of the housing 1, and the connecting pipe 36 is fixedly installed at the bottom of a number of the brackets 35. One end of the first intake pipe 27 is movably sleeved with one end of the connecting pipe 36, and one end of the second outlet pipe 34 is movably sleeved with the other end of the connecting pipe 36. The brackets 35 are provided to fix the connecting pipe 36 and prevent the connecting pipe 36 from falling off. During the operation of the vacuum pump, the gas enters the system from the outside through the first intake pipe 27, and after being processed by components such as the first pump head 24 and the second pump head 30, it is discharged through the second outlet pipe 34. The connecting pipe 36 plays a role of connection and transition, ensuring that the gas can flow smoothly between the components along the predetermined path. The overheat protection capacitor 37 is fixedly installed on the outer circumferential wall of the motor 2, the power switch 38 is fixedly installed on the top of the overheat protection capacitor 37, a first anti-slip pad 39 is fixedly installed at the bottom of the motor 2, and four second anti-slip pads 40 are fixedly installed at the bottom of the housing 1. The handle 17 is fixedly installed on the top of the housing 1. The overheat protection capacitor 37 is provided to monitor the temperature during the operation of the motor 2 in real time. When the temperature of the motor 2 is too high due to long-term operation or other reasons, the power circuit of the motor 2 is cut off to stop the motor 2 from running. The first anti-slip pad 39 and the second anti-slip pads 40 provide reliable anti-slip support for the entire vacuum pump on the placement plane, and the handle 17 enables the operator to easily carry and move the vacuum pump.,

[0038] Working principle: Please refer to Figures 1-6As shown, when in use, turn on the power switch 38. At this time, current passes through the motor 2, and the motor 2 starts to operate. The rotating shaft of the motor 2 starts to rotate. The rotating shaft runs smoothly under the support of the bearing 4 and drives the crankshaft 5 to rotate. The crankshaft 5 drives the connecting rod 6 to move, thereby driving the double diaphragm assembly to work. Gas is inhaled from the second intake pipe 33 into the second pump head 30. As the PTFE composite working diaphragm 10 moves, the chamber volume decreases, and the gas is compressed. When the gas pressure reaches a certain level, the gas will be discharged from the second pump head 30 through the second outlet pipe 34 and enter the connecting pipe 36. The connecting pipe 36 conveys the gas to the first intake pipe 27. The first pump head 24 then inhales the first intake pipe 27 and finally discharges it from the first outlet pipe 28. During the normal operation of the PTFE composite working diaphragm 10, the PTFE protective diaphragm 12 is located below the working diaphragm as an additional protective barrier. When the PTFE composite working diaphragm 10 produces creases at its interface after long-term reciprocating movement up and down, and after a longer service time, when the creases cause the PTFE composite working diaphragm 10 to rupture, penetrate, chemically corrode or be damaged for other reasons, the PTFE protective diaphragm 12 can effectively seal the gas without leakage and prevent the bearing 4 from being corroded.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double diaphragm structure of a chemical corrosion resistant diaphragm vacuum pump, characterized in that: include: A casing (1), wherein a first mounting hole (3) is provided on one side of the casing (1), a bearing (4) is fixedly installed inside the first mounting hole (3), a motor (2) is fixedly installed on one side of the casing (1), a rotating shaft of the motor (2) is fixedly installed on the inner circular wall of the inner ring of the bearing (4), a crankshaft (5) is fixedly installed on one end of the rotating shaft of the motor (2), two connecting rods (6) are movably sleeved on the outer circular wall of the crankshaft (5), and a first threaded groove (7) is respectively provided on one end of the two connecting rods (6); A double diaphragm assembly, wherein the two double diaphragm assemblies are respectively arranged at one end of two connecting rods (6) to protect the transmission gas from leakage. After the motor (2) is powered on, it starts to run, and its rotating shaft rotates accordingly. The rotating power of the motor (2) is transmitted to the crankshaft (5) through the rotating shaft. The crankshaft (5) converts the rotating motion into linear reciprocating motion. The two connecting rods (6) perform reciprocating linear motion under the drive of the crankshaft (5). The first thread groove (7) at one end of the connecting rod (6) is connected to the double diaphragm assembly to transmit the motion to the double diaphragm assembly. The double diaphragm assembly starts to work under the drive of the connecting rod (6).

2. The double diaphragm structure of a chemical corrosion resistant diaphragm vacuum pump according to claim 1, characterized in that: The double diaphragm assembly comprises: Two black PTFE coated glands (8), the two black PTFE coated glands (8) are respectively arranged at one end of the two connecting rods (6), one side of the two black PTFE coated glands (8) is respectively fixedly installed with a threaded rod (9), one side of the two black PTFE coated glands (8) is respectively provided with a PTFE composite working diaphragm (10), one side of the two PTFE composite working diaphragm (10) is respectively fixedly installed with a first circular hole (11), the first circular hole (11) and the threaded rod (9) are movably mounted, one side of the two PTFE composite working diaphragm (10) is respectively provided with a PTFE protective diaphragm (12), one side of the two PTFE protective diaphragm (12) is respectively opened with a second circular hole (13), the second circular hole (13) and the threaded rod (9) are movably mounted.

3. The double diaphragm structure of a chemical corrosion resistant diaphragm vacuum pump according to claim 2, characterized in that: The double diaphragm assembly also includes: Two metal gaskets (14), the two metal gaskets (14) are respectively arranged on one side of the PTFE protective diaphragm (12), a third circular hole (15) is respectively opened on one side of the two metal gaskets (14), the third circular hole (15) and the threaded rod (9) are movably sleeved, a nut (16) is respectively arranged on one side of the two metal gaskets (14), the nut (16) is threadedly connected to the threaded rod (9), and the threaded rod (9) is threadedly connected to the first thread groove (7).

4. The double diaphragm structure of a chemical corrosion resistant diaphragm vacuum pump according to claim 1, characterized in that: Placement holes (18) are respectively provided on both sides of the housing (1), the two PTFE protective diaphragm sheets (12) are respectively movably sleeved inside the two placement holes (18), and the two PTFE composite working diaphragm sheets (10) are respectively movably sleeved inside the two placement holes (18).

5. The double diaphragm structure of a chemical corrosion resistant diaphragm vacuum pump according to claim 4, characterized in that: One side of the housing (1) is provided with four second thread grooves (19); one side of the housing (1) is provided with a cover plate (20); one side of the cover plate (20) is provided with four first insertion holes (21); one side of the cover plate (20) is provided with four first bolts (22); the first bolts (22) pass through the first insertion holes (21) and are threadedly connected to the second thread grooves (19).

6. The double diaphragm structure of a chemical corrosion resistant diaphragm vacuum pump according to claim 5, characterized in that: A plurality of third thread grooves (23) are provided on one side of the housing (1); a first pump head (24) is provided on one side of the housing (1); a plurality of second insertion holes (25) are provided on one side of the first pump head (24); a plurality of second bolts (26) are provided on one side of the first pump head (24); the second bolts (26) pass through the second insertion holes (25) and are threadedly connected to the third thread grooves (23); a first air inlet pipe (27) is fixedly mounted on the air inlet of the first pump head (24); and a first air outlet pipe (28) is fixedly mounted on the air outlet of the first pump head (24).

7. The double diaphragm structure of a chemical corrosion resistant diaphragm vacuum pump according to claim 6, characterized in that: A plurality of fourth thread grooves (29) are provided on one side of the housing (1); a second pump head (30) is provided on one side of the housing (1); a plurality of third insertion holes (31) are provided on one side of the second pump head (30); a plurality of third bolts (32) are provided on one side of the second pump head (30); the third bolts (32) pass through the third insertion holes (31) and are threadedly connected to the fourth thread grooves (29); a second air inlet pipe (33) is fixedly mounted on the air inlet of the second pump head (30); and a second air outlet pipe (34) is fixedly mounted on the air outlet of the second pump head (30).

8. The double diaphragm structure of a chemical corrosion resistant diaphragm vacuum pump according to claim 7, characterized in that: A plurality of brackets (35) are fixedly mounted on the bottom of the casing (1), and a connecting pipe (36) is fixedly mounted on the bottom of the plurality of brackets (35); one end of the first air inlet pipe (27) is movably sleeved with one end of the connecting pipe (36), and one end of the second air outlet pipe (34) is movably sleeved with the other end of the connecting pipe (36).

9. The double diaphragm structure of a chemical corrosion resistant diaphragm vacuum pump according to claim 8, characterized in that: An overheat protection capacitor (37) is fixedly mounted on the outer circular wall of the motor (2), a power switch (38) is fixedly mounted on the top of the overheat protection capacitor (37), a first anti-skid pad (39) is fixedly mounted on the bottom of the motor (2), four second anti-skid pads (40) are fixedly mounted on the bottom of the housing (1), and a handle (17) is fixedly mounted on the top of the housing (1).

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