A nitrogen sealing device for a screw vacuum pump

Abstract

This invention belongs to the field of vacuum pump sealing technology, specifically a nitrogen sealing device for a screw vacuum pump. Addressing the problem that existing nitrogen sealing devices for screw vacuum pumps cannot effectively detect decreased or failed sealing performance, the following solution is proposed: a pump body; a sealing cover fixedly connected to one side of the pump body, with two symmetrical nitrogen sealing elements inside the sealing cover, each connected to two screws within the pump body; and a mounting plate. This invention discloses a nitrogen sealing device for a screw vacuum pump that enables the device to detect the sealing performance of a pump body and nitrogen sealing elements worn over long-term use. By accurately judging the sealing effectiveness of the nitrogen sealing elements through leakage at the connection between the pump body and the sealing cover, and taking remedial measures such as sealing or stopping the pump operation when leakage is severe, the device ensures the normal operation of the pump and extends the service life of the vacuum pump.

Description

Technical Field

[0001] This invention relates to the field of vacuum pump sealing technology, and in particular to a nitrogen sealing device for a screw vacuum pump. Background Technology

[0002] A screw vacuum pump is a pumping device that uses a pair of screws to rotate synchronously and at high speed in opposite directions in the pump casing to generate suction and exhaust. It is a replacement product for oil-sealed vacuum pumps and can be used to pump gases containing a large amount of water vapor and a small amount of dust.

[0003] Nitrogen seals enhance the labyrinth seal effect by filling them with pressurized nitrogen, thus isolating the lubricating oil chamber from the pump cavity and preventing cross-contamination of the media.

[0004] After prolonged use, existing screw vacuum pumps are affected by various factors such as operating vibration. The nitrogen seals inside the pump and the structural components of the pump body will gradually wear and age, resulting in a decrease in the sealing effect of the nitrogen seals. This allows the medium inside the pump to pass through the nitrogen seals and come into contact with the lubricating oil inside the pump, contaminating the lubricating oil and seeping out of the pump, affecting the operation of the vacuum pump and reducing its service life. Summary of the Invention

[0005] This invention discloses a nitrogen sealing device for a screw vacuum pump, which aims to solve the technical problem in the prior art that existing nitrogen sealing devices for screw vacuum pumps cannot be effectively detected when the sealing effect decreases or fails.

[0006] The present invention provides a nitrogen sealing device for a screw vacuum pump, comprising a pump body;

[0007] A sealing cover is fixedly connected to the side opposite to the pump body. Two symmetrical nitrogen gas seals are provided inside the sealing cover, and the two nitrogen gas seals are connected to two screws inside the pump body.

[0008] The mounting cover plate is inserted into the outer side of the sealing cover, and the sealing cover has a round hole. A nitrogen injection tube is fixedly connected to the inner wall of the round hole, and the end of the nitrogen injection tube away from the sealing cover passes through the mounting cover plate and is located outside the sealing cover.

[0009] The leakage detection module is located outside the mounting cover. The leakage detection module is equipped with an adhesive application joint, a brush, and a camera. The adhesive application joint, brush, and camera are all on the same plane as the contact surface between the sealing cover and the pump body. The leakage detection module is used to detect the leakage of the medium inside the pump body through the nitrogen seal and outward from the connection between the sealing cover and the pump body.

[0010] In a preferred embodiment, a slotted seat is fixedly connected to the side of the mounting cover away from the sealing cover. A groove is formed on the inner wall of the slotted seat, and an annular rack is fixedly connected within the groove. A movable platform is slidably connected to the outside of the slotted seat, and a motor is fixedly connected to the outside of the movable platform. The output end of the motor is connected to a gear via a coupling, and the gear meshes with the annular rack. A sliding rod is fixedly connected to the side of the movable platform away from the motor. Two symmetrical bases are fixedly connected to the bottom of the pump body, and the pump body is provided with an air inlet and an air outlet. A sliding groove is formed on the outside of the mounting cover, and a follower plate is slidably connected within the groove. Two pairs of... The pump body has a raised boss with a lead screw movably connected to it. A second motor is fixedly connected to the outside of the follower plate, and the output end of the second motor is connected to one side of the lead screw via a coupling. A transmission rod is provided outside the lead screw, and a sleeve rod is fixedly connected to the end of the transmission rod away from the lead screw. The inner wall of the sleeve rod is slidably connected to the outside of a sliding rod, and an extension rod is fixedly connected to the side of the sleeve rod near the pump body. An isolation cover is fixedly connected to the end of the extension rod away from the sleeve rod, and a third motor is fixedly connected to the inner wall of the isolation cover. The output end of the third motor is connected to a rotating disk via a coupling. The isolation cover is movably connected to the side of the rotating disk opposite to the third motor, and the side of the rotating disk near the third motor is fixedly connected to... The device includes a glue storage tank and a liquid storage bottle. A pump is mounted externally on the glue storage tank and is fixedly connected to the exterior of a rotating disk. The rotating disk has an opening, and a glue application connector is fixedly connected to the opening. The glue application connector is connected to the side of the glue storage tank opposite to the tank. The output end of the pump is connected to the glue application connector via a conduit. The liquid storage bottle has a fine hole on its exterior, and a delivery pipe is fixedly connected to the hole. The delivery pipe passes through the rotating disk and is located on the side of the rotating disk away from the liquid storage bottle. Multiple evenly spaced nozzles are provided on the delivery pipe, and an isolation frame is fixedly connected to the exterior of the delivery pipe. The isolation frame is fixedly connected to the side of the rotating disk opposite to the liquid storage bottle. A second pump is provided, the output end of which is connected to a delivery pipe via a round pipe. A slot is provided on the rotating disk, and a short rod is movably connected within the slot. One end of the short rod is movably connected to the inner wall of the isolation frame, and the other end is equipped with a drive motor. The external part of the drive motor is fixedly connected to the external part of the rotating disk. The output end of the drive motor is connected to the side of the short rod closest to the drive motor via a coupling. A fixing plate is fixedly connected to the side of the rotating disk away from the drive motor. A camera is fixedly connected to the fixing plate, and a gas detector is installed outside the camera. The gas detector is fixedly connected to the side opposite to the fixing plate. Two symmetrical quick-release modules are provided on the mounting cover.

[0011] In a preferred embodiment, the quick-assembly module includes two symmetrical connecting frames. Each connecting frame is fixedly connected to the side opposite to the mounting cover. A stabilizing seat is fixedly connected to the inner wall of each connecting frame. A pin is inserted into the inner wall of each stabilizing seat. Each pin is fixedly connected to the side opposite to the closing cover. Each stabilizing seat has three circumferentially spaced slots, and a locking rod is slidably connected within each slot. A short shaft is fixedly connected to the side of each locking rod away from the stabilizing seat. A rotating frame is slidably connected to the outside of each of the two pins. Each rotating frame has three circumferentially spaced slots. The distributed curved grooves have their inner walls slidably connected to the outside of the short shaft on the same side, and each pin has an annular groove, the inner wall of which is engaged with the outside of the three locking rods on the same side. Both rotating frames are movably connected to the opposite side of the stabilizing seat on the same side. A coil spring is fixedly connected to the inner wall of each rotating frame, and the end of the coil spring away from the rotating frame is fixedly connected to the outside of the stabilizing seat on the same side. A lever is fixedly connected to the side of each rotating frame away from the stabilizing seat. An arc-shaped groove is formed on each connecting frame, and the inner wall of the arc-shaped groove is slidably connected to the outside of the lever on the same side.

[0012] As can be seen from the above, the nitrogen sealing device for a screw vacuum pump provided by the present invention can perform sealing tests on the pump body and nitrogen seals that have been worn down by long-term use. It can accurately determine the sealing effectiveness of the nitrogen seals by observing the leakage at the connection between the pump body and the sealing cover, and take remedial measures such as sealing or stopping the operation of the pump body when the leakage is serious, so as to ensure the normal operation of the pump body and improve the service life of the vacuum pump. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of a nitrogen sealing device for a screw vacuum pump proposed in this invention;

[0014] Figure 2 This is a cross-sectional structural schematic diagram of a nitrogen sealing device for a screw vacuum pump proposed in this invention;

[0015] Figure 3 This is a schematic diagram of the leakage detection module structure of a nitrogen sealing device for a screw vacuum pump proposed in this invention;

[0016] Figure 4 This is a schematic diagram of the mounting cover plate and slot seat structure of a nitrogen sealing device for a screw vacuum pump proposed in this invention;

[0017] Figure 5 This is a schematic diagram of the rotating disk structure of a nitrogen sealing device for a screw vacuum pump proposed in this invention;

[0018] Figure 6 This is a schematic diagram of the isolation frame and camera structure of a nitrogen sealing device for a screw vacuum pump proposed in this invention;

[0019] Figure 7 This is a schematic diagram of the quick-assembly and disassembly module structure of a nitrogen sealing device for a screw vacuum pump proposed in this invention;

[0020] Figure 8 This is a schematic diagram of the stabilizing seat structure of a nitrogen sealing device for a screw vacuum pump proposed in this invention.

[0021] In the diagram: 1. Pump body; 2. Base; 3. Sealing cover; 4. Air inlet; 5. Air outlet; 6. Nitrogen injection pipe; 7. Mounting cover plate; 8. Leakage detection module; 801. Slot seat; 802. Annular rack; 803. Moving platform; 804. Motor 1; 805. Gear; 806. Slide rod; 807. Sleeve rod; 808. Slide groove; 809. Follower plate; 810. Lead screw; 811. Motor 2; 812. Transmission rod; 813. Extension rod; 814. Isolation cover; 815. Motor 3; 816. Rotary disc; 817. Glue storage tank 818. Pump 1; 819. Liquid storage bottle; 820. Pump 2; 821. Drive motor; 822. Adhesive application connector; 823. Brush; 824. Isolation frame; 825. Delivery pipe; 826. Nozzle; 827. Camera; 828. Gas detector; 9. Quick-release module; 901. Connecting frame; 902. Stabilizer; 903. Locking rod; 904. Short shaft; 905. Pin; 906. Annular groove; 907. Rotating frame; 908. Curved groove; 909. Coil spring; 910. Lever; 10. Nitrogen seal. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] The nitrogen sealing device for screw vacuum pumps disclosed in this invention is mainly applied to scenarios where existing nitrogen sealing devices for screw vacuum pumps cannot be effectively detected when the sealing effect decreases or fails.

[0024] Reference Figures 1-8 A nitrogen sealing device for a screw vacuum pump, comprising a pump body 1;

[0025] The sealing cover 3 is connected to the pump body 1 on the opposite side by bolts. Two symmetrical nitrogen gas seals 10 are provided inside the sealing cover 3. The two nitrogen gas seals 10 are connected to two screws inside the pump body 1.

[0026] Install cover plate 7, the inner wall of install cover plate 7 is inserted into the outside of the sealing cover 3, and the sealing cover 3 has a round hole, the inner wall of the round hole is connected to a nitrogen injection pipe 6 by bolts, and the end of nitrogen injection pipe 6 away from the sealing cover 3 passes through install cover plate 7 and is located outside the sealing cover 3.

[0027] Leakage detection module 8 is located outside the mounting cover plate 7. Leakage detection module 8 is equipped with an adhesive application joint 822, a brush 823, and a camera 827. The adhesive application joint 822, the brush 823, and the camera 827 are all on the same plane as the contact surface between the sealing cover 3 and the pump body 1. Leakage detection module 8 is used to detect the leakage of the medium inside the pump body 1 through the seal of the nitrogen gas seal 10 from the connection between the sealing cover 3 and the pump body 1.

[0028] Specifically, before the pump body 1 is put into operation, the mounting cover 7 is fixed to the sealing cover 3 using the quick-release module 9. When the pump body 1 is in use, nitrogen is supplied to the nitrogen seal 10 using the nitrogen injection pipe 6. Due to the wear and aging of the nitrogen seal 10 and the pump body 1, the operating medium in the pump body 1 will pass through the nitrogen gas mold of the nitrogen seal 10 and enter the sealing cover 3, and gradually leak from the connection between the pump body 1 and the sealing cover 3. The oil stains at the connection are cleaned using the leakage detection module 8. After cleaning, the connection is tested. When leakage is found, the leakage point is sealed and the pump body 1 is shut down in time. The device can use the leakage detection module 8 to perform sealing tests on the pump body 1 and the nitrogen seal 10 that have been worn for a long time. By accurately judging the sealing effectiveness of the nitrogen seal 10 through the leakage at the connection between the pump body 1 and the sealing cover 3, the device can take sealing measures or stop the operation of the pump body 1 to remedy the situation when the leakage is serious, so as to ensure the normal operation of the pump body 1 and improve the service life of the vacuum pump.

[0029] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6In a preferred embodiment, a slotted seat 801 is bolted to the side of the mounting cover 7 away from the sealing cover 3. The inner wall of the slotted seat 801 has a groove, and an annular rack 802 is bolted to the groove. A movable platform 803 is slidably connected to the outside of the slotted seat 801. A motor 804 is bolted to the outside of the movable platform 803. The output end of the motor 804 is connected to a gear 805 via a coupling, and the gear 805 meshes with the annular rack 802. A sliding rod 806 is bolted to the side of the movable platform 803 away from the motor 804. Two symmetrical bases 2 are bolted to the bottom of the pump body 1. An air inlet 4 and an air outlet 5 are provided on the pump body 1. The mounting cover 7 has a sliding groove 808 on its exterior. A follower plate 809 is slidably connected within the sliding groove 808. Two symmetrical bosses are bolted to the exterior of the follower plate 809. A lead screw 810 is rotatably connected to the bosses via bearings. A second motor 811 is bolted to the exterior of the follower plate 809, and the output end of the second motor 811 is connected to one side of the lead screw 810 via a coupling. A transmission rod 812 is provided on the exterior of the lead screw 810. A sleeve rod 807 is bolted to the end of the transmission rod 812 away from the lead screw 810. The inner wall of the sleeve rod 807 is slidably connected to the exterior of the sliding rod 806, and an extension rod 813 is bolted to the side of the sleeve rod 807 closest to the pump body 1. An isolation cover 814 is bolted to the end of extension rod 813 away from sleeve rod 807. A motor 815 is bolted to the inner wall of isolation cover 814. A rotating disk 816 is connected to the output end of motor 815 via a coupling. The side of isolation cover 814 opposite to rotating disk 816 is rotatably connected via bearings. A glue storage tank 817 and a liquid storage bottle 819 are bolted to the side of rotating disk 816 closest to motor 815. A pump 818 is installed outside the glue storage tank 817. The outside of pump 818 is bolted to the outside of rotating disk 816. An opening is provided on rotating disk 816, and a glue application connector 822 is bolted into the opening. The glue application connector 822 and... The opposite side of the glue storage tank 817 is connected, and the output end of the first pump 818 is connected to the glue application joint 822 through a conduit; the outside of the liquid storage bottle 819 has a small hole, and a delivery pipe 825 is connected to the small hole by bolts. The delivery pipe 825 passes through the rotating disk 816 and is located on the side of the rotating disk 816 away from the liquid storage bottle 819. Multiple equally spaced nozzles 826 are provided on the delivery pipe 825, and an isolation frame 824 is provided on the outside of the delivery pipe 825. The isolation frame 824 is connected to the opposite side of the rotating disk 816 by bolts. The side of the rotating disk 816 near the liquid storage bottle 819 is connected to the second pump 820 by bolts. The output end of the second pump 820 is connected to the delivery pipe 825 through a round pipe.A slot is formed on the rotating disk 816, and a short rod is rotatably connected to the slot via a bearing. One end of the short rod is rotatably connected to the inner wall of the isolation frame 824 via a bearing, and the other end is equipped with a drive motor 821. The exterior of the drive motor 821 is bolted to the exterior of the rotating disk 816. The output end of the drive motor 821 is connected to the side of the short rod closest to the drive motor 821 via a coupling. A fixing plate is bolted to the side of the rotating disk 816 away from the drive motor 821. A camera 827 is bolted to the fixing plate. A gas detector 828 is mounted on the exterior of the camera 827. The side of the gas detector 828 opposite to the fixing plate is bolted. Two symmetrical quick-release modules 9 are provided on the mounting cover plate 7.

[0030] Specifically, when the pump body 1 is running, motor 1 804 is started, which drives gear 805 meshing with the annular rack 802 to rotate, thereby moving the moving platform 803 along the slot seat 801. Motor 3 815 is started, which rotates the rotating disk 816, causing the brush 823 to face the joint between the pump body 1 and the sealing cover 3. Motor 2 811 is started, which drives the lead screw 810 to rotate, causing the transmission rod 812 to drive the sleeve rod 807 to descend, thereby making the brush 823 fit against the joint. Drive motor 821 and pump 2 820 are started, which sprays the cleaning agent in the storage bottle 819 onto the brush 823 through the nozzle 826. 3. The brush 823 cleans the oil stains at the joint. The motor 815 is restarted, which drives the rotating disk 816 to rotate, so that the camera 827 faces the joint to monitor the lubricating oil and gas penetration at the joint. At the same time, the gas detector 828 detects the protruding gas. When the compressed medium gas delivered by the pump body 1 is detected, the motor 815 is started, which drives the rotating disk 816 to rotate again, so that the glue application joint 822 faces the leakage point. The pump 818 is started, and the pump 818 sprays the sealing glue in the glue storage tank 817 onto the leakage point to seal it. If it cannot be sealed, the pump body 1 is turned off.

[0031] In specific application scenarios, the leakage detection module 8 is mainly used in the leakage detection stage of the leakage detection process. That is, the leakage detection module 8 uses the brush 823, camera 827 and glue joint 822 to enable the device to effectively monitor and control the sealing condition of nitrogen seal 10 and pump body 1, thereby ensuring the safe operation of pump body 1 and reducing the risk when the medium transported in pump body 1 is flammable gas. Using the slot seat 801 and moving stage 803, the device can perform comprehensive coverage detection at the connection between pump body 1 and sealing cover 3, avoiding the limitations of single-point detection and improving the detection accuracy.

[0032] Reference Figure 7 and Figure 8In a preferred embodiment, the quick-release module 9 includes two symmetrical connecting frames 901. The sides of the connecting frames 901 opposite to the mounting cover 7 are bolted together. The inner walls of the connecting frames 901 are bolted together with stabilizing seats 902. The inner walls of the stabilizing seats 902 are each fitted with pins 905. The sides of the pins 905 opposite to the sealing cover 3 are bolted together. Each stabilizing seat 902 has three circumferentially equidistant grooves, and each groove has a slidably connected locking rod 903. The side of the locking rod 903 away from the stabilizing seat 902 is bolted together with a short shaft 904. Rotating frames 907 are slidably connected to the outside of the two pins 905. Each rotating frame 907 has three circumferentially equidistant curved surfaces. The inner walls of the grooves 908 and the curved grooves 908 are slidably connected to the outside of the short shafts 904 on the same side, and the pins 905 are all provided with annular grooves 906. The inner walls of the annular grooves 906 are all engaged with the outside of the three locking rods 903 on the same side. The two rotating frames 907 are rotatably connected to the side opposite to the stabilizing seat 902 on the same side through bearings. The inner walls of the rotating frames 907 are all connected with coil springs 909 by bolts. The end of the coil springs 909 away from the rotating frames 907 is all connected to the outside of the stabilizing seat 902 on the same side by bolts. The side of the rotating frames 907 away from the stabilizing seat 902 is all connected with levers 910 by bolts. The connecting frames 901 are all provided with arc-shaped grooves. The inner walls of the arc-shaped grooves are all slidably connected to the outside of the levers 910 on the same side.

[0033] Specifically, when installing the mounting cover 7 onto the sealing cover 3, the lever 910 is turned, causing the rotating frame 907 to rotate against the torque of the coil spring 909. This causes the inner wall of the curved groove 908 to push the locking lever 903 connected to the short shaft 904 to move outwards towards the stable seat 902, aligning the stable seat 902 with the pin 905 and inserting it so that the pin 905 is fully inserted into the stable seat 902. The lever 910 is then released, and under the torque of the coil spring 909, the locking lever 903 returns to its original position, allowing the locking lever 903 to be inserted into the annular groove 906 to lock the pin 905 onto the stable seat 902, thereby fixing the mounting cover 7 onto the sealing cover 3.

[0034] In specific application scenarios, the quick-release module 9 is mainly suitable for the quick-release stage in the quick-release process. That is, the quick-release module 9 can quickly and easily complete the connection and disassembly of the mounting cover 7 and the sealing cover 3 by using the locking rod 903, the coil spring 909 and the curved groove 908, thereby improving the disassembly and assembly efficiency of the mounting cover 7, improving the turnover efficiency of the mounting cover 7, and enabling the mounting cover 7 to be installed on the pump body 1 where needed, thus saving costs.

[0035] Working principle: When the mounting cover 7 is installed on the sealing cover 3, the lever 910 is moved, causing the rotating frame 907 to rotate against the torque of the coil spring 909. This causes the inner wall of the curved groove 908 to push the locking lever 903 connected to the short shaft 904 to move outwards towards the stabilizer 902, aligning the stabilizer 902 with the pin 905 and inserting it until the pin 905 is fully inserted into the stabilizer 902. Releasing the lever 910 causes the locking lever 903 to return to its original position under the torque of the coil spring 909. This allows the locking rod 903 to be inserted into the annular groove 906, locking the pin 905 onto the stabilizing seat 902, thereby fixing the mounting cover 7 onto the sealing cover 3. When the pump body 1 is running, the first motor 804 is started, driving the gear 805 meshing with the annular rack 802 to rotate, thereby moving the moving platform 803 along the slot seat 801. The third motor 815 is started, rotating the rotating disk 816, causing the brush 823 to face the joint between the pump body 1 and the sealing cover 3. At the same time, motor 811 is started, which drives screw 810 to rotate, causing transmission rod 812 to drive sleeve rod 807 to descend, thereby making brush 823 fit against the seam. Drive motor 821 and pump 820 are started, and pump 820 sprays cleaning agent in storage bottle 819 onto brush 823 through nozzle 826. Brush 823 then cleans the oil stains at the seam. Motor 815 is started again, which drives rotating disk 816 to rotate, so that camera 827... Towards the joint, monitor the lubricating oil and gas penetration at the joint. At the same time, gas detector 828 will detect the protruding gas. When the compressed medium gas delivered by pump body 1 is detected, motor 3 815 is started. Motor 3 815 drives the rotating disk 816 to rotate again, so that the glue application joint 822 is oriented towards the leakage point. Pump 1 818 is started. Pump 1 818 sprays the sealing glue in the glue storage tank 817 onto the leakage point to seal it. If it cannot be sealed, pump body 1 is turned off.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A screw vacuum pump nitrogen sealing device, characterized by, Including pump body (1); The closed cover (3) is fixedly connected with the side opposite to the pump body (1), two symmetrical nitrogen gas seals (10) are arranged in the closed cover (3), and the two nitrogen gas seals (10) are connected with the two screw rods in the pump body (1); The mounting cover plate (7) is inserted with the inner wall of the mounting cover plate (7) and the outer portion of the closed cover (3), and a circular hole is formed in the closed cover (3), and a nitrogen injection pipe (6) is fixedly connected to the inner wall of the circular hole, one end of the nitrogen injection pipe (6) away from the closed cover (3) penetrates through the mounting cover plate (7) and is located outside the closed cover (3); The leakage detection module (8) is arranged outside the mounting cover plate (7), the leakage detection module (8) is provided with a glue joint (822), a brush (823) and a camera (827), and the glue joint (822), the brush (823) and the camera (827) are all arranged on the same plane with the contact surface of the closed cover (3) and the pump body (1), and the leakage detection module (8) is used for detecting the leakage of the medium in the pump body (1) through the nitrogen gas seal (10) from the closed cover (3) and the pump body (1) connection to the outside.

2. A nitrogen seal device for a screw vacuum pump according to claim 1, characterized in that The mounting cover plate (7) is fixedly connected with the side away from the closed cover (3) and the inner wall of the slot seat (801) is provided with a groove, the inner wall of the groove is fixedly connected with a ring-shaped rack (802), the outer portion of the slot seat (801) is slidably connected with a moving table (803), the outer portion of the moving table (803) is fixedly connected with a motor (804), the output end of the motor (804) is connected with a gear (805) through a shaft coupling, and the gear (805) is engaged with the ring-shaped rack (802), the side of the moving table (803) away from the motor (804) is fixedly connected with a sliding rod (806), the bottom of the pump body (1) is fixedly connected with two symmetrical bases (2), and the pump body (1) is provided with an air inlet (4) and an air outlet (5).

3. A nitrogen seal device for a screw vacuum pump according to claim 2, characterized in that The outer portion of the mounting cover plate (7) is provided with a sliding groove (808), the sliding groove (808) is slidably connected with a follower plate (809), the outer portion of the follower plate (809) is fixedly connected with two symmetrical bosses, the same screw rod (810) is movably connected with the bosses, the outer portion of the follower plate (809) is fixedly connected with a motor (811), and the output end of the motor (811) is connected with one side of the screw rod (810) through a shaft coupling.

4. A nitrogen seal device for a screw vacuum pump according to claim 3, characterized in that The outer portion of the screw rod (810) is provided with a transmission rod (812), one end of the transmission rod (812) away from the screw rod (810) is fixedly connected with a sleeve rod (807), the inner wall of the sleeve rod (807) is slidably connected with the outer portion of the sliding rod (806), and the side of the sleeve rod (807) close to the pump body (1) is fixedly connected with an extension rod (813), one end of the extension rod (813) away from the sleeve rod (807) is fixedly connected with an isolation cover (814), and the inner wall of the isolation cover (814) is fixedly connected with a motor (815).

5. A nitrogen seal device for a screw vacuum pump according to claim 4, characterized in that The output end of the motor three (815) is connected with a rotating disc (816) through a shaft coupling, the isolating cover (814) is movably connected to the side opposite to the rotating disc (816), the side close to the motor three (815) of the rotating disc (816) is fixedly connected with a glue storage tank (817) and a liquid storage bottle (819), the outer part of the glue storage tank (817) is provided with a pump one (818), the outer part of the pump one (818) is fixedly connected with the outer part of the rotating disc (816), the rotating disc (816) is provided with a hole, and the hole is fixedly connected with a glue applying connector (822), the side opposite to the glue storage tank (817) of the glue applying connector (822) is communicated, and the output end of the pump one (818) is connected with the glue applying connector (822) through a pipeline.

6. A nitrogen seal device for a screw vacuum pump according to claim 5, characterized in that The outer part of the liquid storage bottle (819) is provided with a fine hole, and the fine hole is fixedly connected with a conveying pipe (825), the conveying pipe (825) passes through the rotating disc (816) and is located on the side away from the liquid storage bottle (819) of the rotating disc (816), a plurality of equidistantly distributed nozzles (826) are arranged on the conveying pipe (825), and the outer part of the conveying pipe (825) is provided with an isolation frame (824), the side opposite to the rotating disc (816) of the isolation frame (824) is fixedly connected, the side close to the liquid storage bottle (819) of the rotating disc (816) is fixedly connected with a pump two (820), and the output end of the pump two (820) is connected with the conveying pipe (825) through a circular pipe.

7. A nitrogen seal device for a screw vacuum pump according to claim 6, characterized in that The rotating disc (816) is provided with a hole groove, a short rod is movably connected in the hole groove, one end of the short rod is movably connected with the inner wall of the isolation frame (824), the other end is provided with a driving motor (821), the outer part of the driving motor (821) is fixedly connected with the outer part of the rotating disc (816), the output end of the driving motor (821) is connected with the side close to the driving motor (821) of the short rod through a shaft coupling, the side away from the driving motor (821) of the rotating disc (816) is fixedly connected with a fixed plate, the fixed plate is fixedly connected with a camera (827), the outer part of the camera (827) is provided with a gas detector (828), the side opposite to the fixed plate of the gas detector (828) is fixedly connected, and the mounting cover plate (7) is provided with two symmetrical quick disassembly and assembly modules (9).

8. A nitrogen seal device for a screw vacuum pump according to claim 7, characterized in that The quick disassembly and assembly module (9) comprises two symmetrical link frames (901), the inner walls of the link frames (901) are fixedly connected with stable seats (902), the inner walls of the stable seats (902) are inserted with latches (905), the side opposite to the closing cover (3) of the latches (905) is fixedly connected, three circumferentially equidistantly distributed cut grooves are formed in the stable seats (902), the cut grooves are slidably connected with locking rods (903), and the side away from the stable seat (902) of the locking rod (903) is fixedly connected with a short shaft (904).

9. A nitrogen seal device for a screw vacuum pump according to claim 8, characterized in that The outer part of each of the two said insertion pins (905) is slidably connected with a rotating frame (907), three circumferentially equidistantly distributed curved grooves (908) are formed in the rotating frame (907), the inner wall of each of the curved grooves (908) is slidably connected with the outer part of the short shaft (904) on the same side, and an annular groove (906) is formed in each of the insertion pins (905), the inner wall of the annular groove (906) is externally connected with the three locking rods (903) on the same side.

10. A nitrogen seal device for a screw vacuum pump according to claim 9, characterized in that The two said rotating frames (907) are movably connected with the side opposite to the stabilizing seat (902) on the same side, the inner wall of each of the rotating frames (907) is fixedly connected with a coil spring (909), the end of the coil spring (909) away from the rotating frame (907) is fixedly connected with the outer part of the stabilizing seat (902) on the same side, and the side of the rotating frame (907) away from the stabilizing seat (902) is fixedly connected with a push rod (910), an arc-shaped groove is formed in the connection frame (901), and the inner wall of the arc-shaped groove is slidably connected with the outer part of the push rod (910) on the same side.

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