Nitrogen sealing device of screw vacuum pump

Abstract

The invention belongs to the technical field of vacuum pump sealing, particularly relates to a nitrogen sealing device of a screw vacuum pump, and aims to solve the problem that an existing nitrogen sealing device of the screw vacuum pump cannot be effectively detected when the sealing effect is reduced or fails. The sealing cover is fixedly connected with the side, opposite to the pump body, of the sealing cover, two symmetrical nitrogen sealing pieces are arranged in the sealing cover, and the two nitrogen sealing pieces are connected with the two screw rods in the pump body; and mounting the cover plate. According to the nitrogen sealing device of the screw vacuum pump, disclosed by the invention, the device can be used for detecting the sealing performance of a pump body and a nitrogen sealing element which are worn due to long-time use, and the sealing effectiveness of the nitrogen sealing element can be accurately judged according to the leakage condition of the joint of the pump body and the sealing cover; and when the leakage is serious, a plugging measure is taken or the operation of the pump body is stopped to remedy, so that the normal operation of the pump body is ensured and the service life of the vacuum pump is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum pump sealing, and particularly to a nitrogen sealing device for a screw vacuum pump. Background Art

[0002] A screw vacuum pump is a gas extraction device that uses a pair of screws to rotate synchronously and at high speed in opposite directions in a pump housing to generate suction and exhaust effects. It is an updated product of oil-sealed vacuum pumps and can pump gas in occasions containing a large amount of water vapor and a small amount of dust.

[0003] The nitrogen seal can strengthen the labyrinth seal effect by filling pressurized nitrogen, isolate the lubricating oil chamber from the pump chamber, and prevent cross-contamination of media.

[0004] After long-term use, the existing screw vacuum pump is affected by various factors such as running vibration, and the nitrogen seals and structural parts of the pump body will gradually wear and age, resulting in a decrease in the sealing effect of the nitrogen seals. As a result, the media in the pump passes through the nitrogen seals and contacts the lubricating oil in the pump, contaminating the lubricating oil and penetrating outside the pump, affecting the operation of the vacuum pump and reducing the service life of the vacuum pump. Summary of the Invention

[0005] The present invention discloses a nitrogen sealing device for a screw vacuum pump, aiming to solve the technical problem that the existing nitrogen sealing device of a screw vacuum pump in the background art cannot be effectively detected when the sealing effect decreases or fails.

[0006] A nitrogen sealing device for a screw vacuum pump proposed by the present invention includes a pump body; A closing cover, which is fixedly connected to one side of the pump body opposite to it. Two symmetric nitrogen seals are arranged inside the closing cover, and the two nitrogen seals are connected to two screws inside the pump body; An installation cover plate, the inner wall of which is inserted into the outside of the closing cover, and a circular hole is opened on the closing cover. A nitrogen injection pipe is fixedly connected to the inner wall of the circular hole, and the end of the nitrogen injection pipe away from the closing cover passes through the installation cover plate and is located outside the closing cover; A leakage detection module, which is arranged outside the installation cover plate. A glue application joint, a brush and a camera are arranged on the leakage detection module, and the glue application joint, the brush and the camera are all in the same plane as the contact surface between the closing cover and the pump body. The leakage detection module is used to detect the situation where the media in the pump penetrates outward from the connection between the closing cover and the pump body through the seal of the nitrogen seal.

[0007] In a preferred embodiment, a notch seat is fixedly connected to the side of the mounting cover plate away from the closing cover. A groove is formed in the inner wall of the notch seat, and an annular rack is fixedly connected in the groove. A moving platform is slidably connected to the outside of the notch seat. A first motor is fixedly connected to the outside of the moving platform. The output end of the first motor is connected to a gear through a coupling, and the gear meshes with the annular rack. A sliding rod is fixedly connected to the side of the moving platform away from the first motor. Two symmetrical bases are fixedly connected to the bottom of the pump body. An air inlet and an air outlet are provided on the pump body; a chute is formed in the outside of the mounting cover plate, and a follower plate is slidably connected in the chute. Two symmetrical convex platforms are fixedly connected to the outside of the follower plate, and the same lead screw is movably connected to the convex platforms. 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 through a coupling; a transmission rod is arranged on the outside of the lead screw. One end of the transmission rod away from the lead screw is fixedly connected to a sleeve rod. The inner wall of the sleeve rod is slidably connected to the outside of the sliding rod, and an extension rod is fixedly connected to the side of the sleeve rod close to the pump body. One end of the extension rod away from the sleeve rod is fixedly connected to an isolation cover, 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 through a coupling. The isolation cover is movably connected to the side of the rotating disk opposite thereto. A glue storage tank and a liquid storage bottle are fixedly connected to the side of the rotating disk close to the third motor. A first pump is arranged on the outside of the glue storage tank, and the outside of the first pump is fixedly connected to the outside of the rotating disk. An orifice is formed in the rotating disk, and a glue application joint is fixedly connected in the orifice. The side of the glue application joint opposite to the glue storage tank is communicated. The output end of the first pump is connected to the glue application joint through a conduit; fine holes are formed in the outside of the liquid storage bottle, and a delivery pipe is fixedly connected in the fine holes. The delivery pipe passes through the rotating disk and is located on the side of the rotating disk away from the liquid storage bottle. A plurality of equally spaced nozzles are arranged on the delivery pipe, and an isolation frame is arranged on the outside of the delivery pipe. The isolation frame is fixedly connected to the side of the rotating disk opposite thereto. A second pump is fixedly connected to the side of the rotating disk close to the liquid storage bottle. The output end of the second pump is connected to the delivery pipe through a round pipe; a hole slot is formed in the rotating disk, and a short rod is movably connected in the hole slot. One end of the short rod is movably connected to the inner wall of the isolation frame, and the other end is provided with a driving motor. The outside of the driving motor is fixedly connected to the outside of the rotating disk. The output end of the driving motor is connected to the side of the short rod close to the driving motor through a coupling. A fixing plate is fixedly connected to the side of the rotating disk away from the driving motor, and a camera is fixedly connected to the fixing plate. A gas detector is arranged on the outside of the camera. The gas detector is fixedly connected to the side of the fixing plate opposite thereto. Two symmetrical quick disassembly modules are arranged on the mounting cover plate.

[0008] In a preferred embodiment, the quick disassembly and assembly module includes two symmetric connecting frames, which are fixedly connected to the side opposite to the mounting cover plate. The inner walls of the connecting frames are fixedly connected with stabilizing seats, and pins are inserted into the inner walls of the stabilizing seats. The pins are fixedly connected to the side opposite to the closing cover. Three circumferentially equally spaced cutting grooves are formed in each stabilizing seat, and locking rods are slidably connected in the cutting grooves. The outer sides of the locking rods away from the stabilizing seats are fixedly connected with short shafts. Rotating frames are slidably connected to the outsides of the two pins. Three circumferentially equally spaced curved grooves are formed in each rotating frame, and the inner walls of the curved grooves are slidably connected to the outsides of the short shafts on the same side. Annular grooves are formed in the pins, and the inner walls of the annular grooves are clamped with the outsides of the three locking rods on the same side. The two rotating frames are movably connected to the side opposite to the stabilizing seats on the same side. Coil springs are fixedly connected to the inner walls of the rotating frames, and the ends of the coil springs away from the rotating frames are fixedly connected to the outsides of the stabilizing seats on the same side. The sides of the rotating frames away from the stabilizing seats are fixedly connected with toggle rods, and arc-shaped grooves are formed in the connecting frames. The inner walls of the arc-shaped grooves are slidably connected to the outsides of the toggle rods on the same side.

[0009] As can be seen from the above, the nitrogen sealing device for a screw vacuum pump provided by the present invention can enable the device to perform a sealing performance test on the pump body and the nitrogen seal that are worn after long-term use, accurately judge the sealing effectiveness of the nitrogen seal through the leakage condition at the connection between the pump body and the closing cover, and take plugging measures or stop the operation of the pump body for remedy when the leakage is serious, ensuring the normal operation of the pump body and improving the service life of the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of a nitrogen sealing device for a screw vacuum pump proposed by the present invention; Figure 2 It is a schematic sectional view of a nitrogen sealing device for a screw vacuum pump proposed by the present invention; Figure 3 It is a schematic diagram of the leakage detection module structure of a nitrogen sealing device for a screw vacuum pump proposed by the present invention; Figure 4 It is a schematic diagram of the mounting cover plate and the notch seat structure of a nitrogen sealing device for a screw vacuum pump proposed by the present invention; Figure 5 It is a schematic diagram of the rotating disk structure of a nitrogen sealing device for a screw vacuum pump proposed by the present invention; Figure 6 It is a schematic diagram of the isolation frame and camera structure of a nitrogen sealing device for a screw vacuum pump proposed by the present invention; Figure 7 It is a schematic diagram of the quick disassembly and assembly module structure of a nitrogen sealing device for a screw vacuum pump proposed by the present invention; Figure 8Schematic structural diagram of the stabilizing seat of a nitrogen sealing device for a screw vacuum pump proposed by the present invention.

[0011] In the figure: 1, pump body; 2, base; 3, closing cover; 4, air inlet; 5, air outlet; 6, nitrogen injection pipe; 7, mounting cover plate; 8, leakage detection module; 801, notch seat; 802, annular rack; 803, moving table; 804, motor 1; 805, gear; 806, sliding rod; 807, sleeve rod; 808, chute; 809, follower plate; 810, lead screw; 811, motor 2; 812, transmission rod; 813, extension rod; 814, isolation cover; 815, motor 3; 816, rotating disk; 817, glue storage tank; 818, pump 1; 819, liquid storage bottle; 820, pump 2; 821, driving motor; 822, glue application joint; 823, brush; 824, isolation frame; 825, delivery pipe; 826, nozzle; 827, camera; 828, gas detector; 9, quick disassembly and assembly module; 901, connecting frame; 902, stabilizing seat; 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. Specific embodiments

[0012] 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.

[0013] A nitrogen sealing device for a screw vacuum pump disclosed by the present invention is mainly applied to scenarios where the existing nitrogen sealing device for a screw vacuum pump cannot be effectively detected when the sealing effect deteriorates or fails.

[0014] Refer to Figures 1 - 8 , a nitrogen sealing device for a screw vacuum pump, including a pump body 1; Closing cover 3, one side of the closing cover 3 opposite to the pump body 1 is connected by bolts, and two symmetrical nitrogen seals 10 are arranged inside the closing cover 3, and the two nitrogen seals 10 are connected to the two screws inside the pump body 1; Mounting cover plate 7, the inner wall of the mounting cover plate 7 is inserted into the outside of the closing cover 3, and a circular hole is opened on the closing cover 3, and a nitrogen injection pipe 6 is connected to the inner wall of the circular hole by bolts. One end of the nitrogen injection pipe 6 away from the closing cover 3 passes through the mounting cover plate 7 and is located outside the closing cover 3; The leakage detection module 8 is arranged outside the mounting cover plate 7. A glue application joint 822, a brush 823 and a camera 827 are arranged on the leakage detection module 8, and the glue application joint 822, the brush 823 and the camera 827 are all on the same plane as the contact surface between the closing cover 3 and the pump body 1. The leakage detection module 8 is used to detect the situation where the medium in the pump body 1 penetrates outward from the connection between the closing cover 3 and the pump body 1 through the seal of the nitrogen seal 10.

[0015] Specifically, before the pump body 1 operates, the mounting cover plate 7 is fixed on the closing cover 3 by using the quick disassembly and assembly module 9. When the pump body 1 is in use, nitrogen is conveyed into the nitrogen seal 10 through 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 penetrate through the nitrogen gas film block of the nitrogen seal 10 into the closing cover 3 and gradually leak from the connection between the pump body 1 and the closing cover 3. The leakage detection module 8 is used to clean the oil stain at the connection. After cleaning, the connection is detected. When leakage is found, the leakage point is blocked, and the pump body 1 is shut down in time; the device can use the leakage detection module 8 to perform a sealing performance detection on the pump body 1 and the nitrogen seal 10 that are worn after long-term use. The sealing effectiveness of the nitrogen seal 10 can be accurately judged through the leakage situation at the connection between the pump body 1 and the closing cover 3. When the leakage is serious, blocking measures are taken or the operation of the pump body 1 is stopped for remedy to ensure the normal operation of the pump body 1 and improve the service life of the vacuum pump.

[0016] Refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 6, in a preferred factual manner, a notch seat 801 is bolted to the side of the mounting cover plate 7 away from the closing cover 3. A groove is formed in the inner wall of the notch seat 801, and an annular rack 802 is bolted in the groove. A moving platform 803 is slidably connected to the outside of the notch seat 801. A first motor 804 is bolted to the outside of the moving platform 803. The output end of the first motor 804 is connected to a gear 805 through a coupling, and the gear 805 meshes with the annular rack 802. A slide bar 806 is bolted to the side of the moving platform 803 away from the first 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; a chute 808 is formed in the outside of the mounting cover plate 7, and a follower plate 809 is slidably connected in the chute 808. Two symmetrical bosses are bolted to the outside of the follower plate 809, and the same lead screw 810 is rotatably connected to the bosses through bearings. A second motor 811 is bolted to the outside of the follower plate 809, and the output end of the second motor 811 is connected to one side of the lead screw 810 through a coupling; a transmission rod 812 is provided on the outside of the lead screw 810. One end of the transmission rod 812 away from the lead screw 810 is bolted to a sleeve rod 807. The inner wall of the sleeve rod 807 is slidably connected to the outside of the slide bar 806, and an extension rod 813 is bolted to the side of the sleeve rod 807 close to the pump body 1. One end of the extension rod 813 away from the sleeve rod 807 is bolted to an isolation cover 814. A third motor 815 is bolted to the inner wall of the isolation cover 814; the output end of the third motor 815 is connected to a rotating disc 816 through a coupling. The side of the isolation cover 814 opposite to the rotating disc 816 is rotatably connected through a bearing. A glue storage tank 817 and a liquid storage bottle 819 are bolted to the side of the rotating disc 816 close to the third motor 815. A first pump 818 is provided on the outside of the glue storage tank 817, and the outside of the first pump 818 is bolted to the outside of the rotating disc 816. An orifice is formed in the rotating disc 816, and a glue application joint 822 is bolted in the orifice. The side of the glue application joint 822 opposite to the glue storage tank 817 is communicated. The output end of the first pump 818 is connected to the glue application joint 822 through a conduit; a fine hole is formed in the outside of the liquid storage bottle 819, and a delivery pipe 825 is bolted in the fine hole. The delivery pipe 825 passes through the rotating disc 816 and is located on the side of the rotating disc 816 away from the liquid storage bottle 819. A plurality of equally spaced spray 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 side of the isolation frame 824 opposite to the rotating disc 816 is bolted. A second pump 820 is bolted to the side of the rotating disc 816 close to the liquid storage bottle 819. The output end of the second pump 820 is connected to the delivery pipe 825 through a round pipe;The rotating disk 816 is provided with a hole groove. A short rod is rotatably connected in the hole groove through a bearing. One end of the short rod is rotatably connected to the inner wall of the isolation frame 824 through a bearing, and the other end is provided with a driving motor 821. The outside of the driving motor 821 is bolted to the outside of the rotating disk 816. The output end of the driving motor 821 is connected to one side of the short rod close to the driving motor 821 through a coupling. And a fixing plate is bolted to the side of the rotating disk 816 away from the driving motor 821. A camera 827 is bolted to the fixing plate. A gas detector 828 is arranged outside the camera 827. The side of the gas detector 828 opposite to the fixing plate is bolted. Two symmetric quick disassembly and assembly modules 9 are arranged on the installation cover plate 7.

[0017] Specifically, when the pump body 1 is running, start the first motor 804. The first motor 804 drives the gear 805 meshing with the annular rack 802 to rotate, so that the moving platform 803 moves along the notch seat 801. Start the third motor 815. The third motor 815 rotates the rotating disk 816 to make the brush 823 face the joint between the pump body 1 and the closing cover 3. Start the second motor 811. The second motor 811 drives the lead screw 810 to rotate, so that the transmission rod 812 drives the sleeve rod 807 to descend, so that the brush 823 fits with the joint. Start the driving motor 821 and the second pump 820. The second pump 820 sprays the cleaning agent in the liquid storage bottle 819 to the brush 823 through the spray port 826. The brush 823 then cleans the oil stain at the joint. Start the third motor 815 again. The third motor 815 drives the rotating disk 816 to rotate to make the camera 827 face the joint, and monitors the lubricating oil and gas penetration at the joint. At the same time, the gas detector 828 detects the emitted gas. When detecting the compressed medium gas transported by the pump body 1, start the third motor 815. The third motor 815 drives the rotating disk 816 to rotate again to make the glue application joint 822 face the leakage point. Start the first pump 818. The first pump 818 sprays the sealing glue in the glue storage tank 817 to the leakage point to seal it. If it cannot be sealed, then turn off the pump body 1.

[0018] In a specific application scenario, the leakage detection module 8 is mainly applicable to the leakage detection link in the leakage detection process. That is, the leakage detection module 8 can effectively monitor and control the sealing conditions of the nitrogen seal 10 and the pump body 1 by using the brush 823, the camera 827 and the glue application joint 822, so as to ensure the safe operation of the pump body 1 and reduce the risk when the medium transported in the pump body 1 is a combustible gas. Using the notch seat 801 and the moving platform 803 can make the device comprehensively cover and detect the connection between the pump body 1 and the closing cover 3, avoiding the limitation of single-point detection and improving the detection accuracy.

[0019] Refer to Figure 7 and Figure 8, in a preferred factual manner, the quick disassembly and assembly module 9 includes two symmetrical connection frames 901. The sides of the connection frames 901 opposite to the mounting cover plate 7 are both connected by bolts. The inner walls of the connection frames 901 are both connected by bolts with stabilizing seats 902. Plug pins 905 are inserted into the inner walls of the stabilizing seats 902. The sides of the plug pins 905 opposite to the closing cover 3 are both connected by bolts. Three circumferentially equally spaced cutting grooves are provided on each of the stabilizing seats 902. Locking rods 903 are slidably connected in the cutting grooves, and short shafts 904 are connected by bolts to the sides of the locking rods 903 far from the stabilizing seats 902. Rotating frames 907 are slidably connected to the outsides of the two plug pins 905. Three circumferentially equally spaced curved surface grooves 908 are provided on each of the rotating frames 907. The inner walls of the curved surface grooves 908 are slidably connected to the outsides of the short shafts 904 on the same side. Annular grooves 906 are provided on each of the plug pins 905. The inner walls of the annular grooves 906 are snap-connected to the outsides of the three locking rods 903 on the same side. The two rotating frames 907 are rotatably connected to the sides of the stabilizing seats 902 on the same side through bearings. Coil springs 909 are connected by bolts to the inner walls of the rotating frames 907. The ends of the coil springs 909 far from the rotating frames 907 are connected by bolts to the outsides of the stabilizing seats 902 on the same side. Pushing rods 910 are connected by bolts to the sides of the rotating frames 907 far from the stabilizing seats 902. Arc-shaped grooves are provided on each of the connection frames 901. The inner walls of the arc-shaped grooves are slidably connected to the outsides of the pushing rods 910 on the same side.

[0020] Specifically, when installing the mounting cover plate 7 on the closing cover 3, the pushing rod 910 is toggled to make the rotating frame 907 rotate against the torsion of the coil spring 909. Thus, when the inner wall of the curved surface groove 908 rotates, it pushes the locking rod 903 connected to the short shaft 904 to move outward from the stabilizing seat 902. The stabilizing seat 902 is aligned and inserted into the plug pin 905, so that the plug pin 905 completely enters the stabilizing seat 902. The pushing rod 910 is released. Under the torsion of the coil spring 909, the locking rod 903 returns to its original position, enabling the locking rod 903 to be inserted into the annular groove 906 to lock the plug pin 905 on the stabilizing seat 902, thereby fixing the mounting cover plate 7 on the closing cover 3.

[0021] In a specific application scenario, the quick disassembly and assembly module 9 is mainly applicable to the quick disassembly and assembly link in the quick disassembly and assembly process. That is, the quick disassembly and assembly module 9 can quickly and conveniently complete the connection and disassembly of the mounting cover plate 7 and the closing cover 3 by using the locking rod 903, the coil spring 909, and the curved surface groove 908. Thereby, the disassembly and assembly efficiency of the mounting cover plate 7 is improved, the turnover efficiency of the mounting cover plate 7 is increased, enabling the mounting cover plate 7 to be installed on the pump body 1 with requirements, and cost is saved.

[0022] Working principle: When installing the mounting cover plate 7 on the closing cover 3, the lever 910 is toggled, causing the rotating frame 907 to rotate against the torsion force of the coil spring 909. As a result, the inner wall of the curved surface groove 908 pushes the locking rod 903 connected to the short shaft 904 to move outward from the stabilizing seat 902 during rotation. The stabilizing seat 902 is aligned and inserted into the pin 905, causing the pin 905 to fully enter the stabilizing seat 902. When the lever 910 is released, under the torsion force of the coil spring 909, the locking rod 903 returns to its original position, enabling the locking rod 903 to insert into the annular groove 906 to lock the pin 905 on the stabilizing seat 902, thereby fixing the mounting cover plate 7 on the closing cover 3. When the pump body 1 is operating, the first motor 804 is started. The first motor 804 drives the gear 805 engaged with the annular rack 802 to rotate, causing the moving table 803 to move along the notch seat 801. The third motor 815 is started, and the third motor 815 rotates the rotating disk 816, making the brush 823 face the joint between the pump body 1 and the closing cover 3. The second motor 811 is started, and the second motor 811 drives the lead screw 810 to rotate, causing the transmission rod 812 to drive the sleeve rod 807 to descend, so that the brush 823 fits against the joint. The driving motor 821 and the second pump 820 are started. The second pump 820 sprays the cleaning agent in the liquid storage bottle 819 onto the brush 823 through the nozzle 826, and the brush 823 then cleans the oil stains at the joint. The third motor 815 is started again, and the third motor 815 drives the rotating disk 816 to rotate, making the camera 827 face the joint to monitor the lubricating oil and gas penetration at the joint. At the same time, the gas detector 828 detects the gas that extends. When the compressed medium gas transported by the pump body 1 is detected, the third motor 815 is started, and the third motor 815 drives the rotating disk 816 to rotate again, making the glue application joint 822 face the leakage point. The first pump 818 is started, and the first 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 shut down.

[0023] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A nitrogen sealing device for a screw vacuum pump, characterized in that: comprising a pump body (1); A closing cover (3), the closing cover (3) being fixedly connected to a side opposite to the pump body (1), two symmetrical nitrogen seals (10) being arranged in the closing cover (3), and the two nitrogen seals (10) being connected to two screws in the pump body (1); A mounting cover plate (7), wherein the inner wall of the mounting cover plate (7) is plugged into the outside of the closing cover (3), and a circular hole is provided on the closing cover (3), and a nitrogen injection pipe (6) is fixedly connected to the inner wall of the circular hole, and an end of the nitrogen injection pipe (6) away from the closing cover (3) passes through the mounting cover plate (7) and is located outside the closing cover (3); A leakage detection module (8), the leakage detection module (8) being arranged outside the mounting cover plate (7), the leakage detection module (8) being 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 located on the same plane as the contact surface between the closing cover (3) and the pump body (1), and the leakage detection module (8) is used to detect the situation in which the medium in the pump body (1) penetrates the seal of the nitrogen seal (10) and permeates outward from the connection between the closing cover (3) and the pump body (1).

2. A screw vacuum pump nitrogen sealing device according to claim 1, characterized in that: A notch seat (801) is fixedly connected to the side of the mounting cover plate (7) away from the closing cover (3); a groove is provided on the inner wall of the notch seat (801); an annular rack (802) is fixedly connected to the groove; a moving platform (803) is slidably connected to the outside of the notch seat (801); a motor 1 (804) is fixedly connected to the outside of the moving platform (803); an output end of the motor 1 (804) is connected to a gear (805) via a coupling, and the gear (805) is meshed with the annular rack (802); a sliding rod (806) is fixedly connected to the side of the moving platform (803) away from the motor 1 (804); two symmetrical bases (2) are fixedly connected to the bottom of the pump body (1); and an air inlet (4) and an air outlet (5) are provided on the pump body (1).

3. A screw vacuum pump nitrogen sealing device according to claim 2, characterized in that: The installation cover plate (7) is provided with a slide groove (808) on the outside, a follower plate (809) is slidably connected in the slide groove (808), two symmetrical bosses are fixedly connected to the outside of the follower plate (809), a same screw rod (810) is movably connected to the bosses, a second motor (811) is fixedly connected to the outside of the follower plate (809), and an output end of the second motor (811) is connected to one side of the screw rod (810) via a coupling.

4. A screw vacuum pump nitrogen sealing device according to claim 2, characterized in that: A transmission rod (812) is arranged outside the screw rod (810), one end of the transmission rod (812) away from the screw rod (810) is fixedly connected to a sleeve rod (807), the inner wall of the sleeve rod (807) is slidably connected to the outside of the sliding rod (806), and an extension rod (813) is fixedly connected to a side of the sleeve rod (807) close to the pump body (1), one end of the extension rod (813) away from the sleeve rod (807) is fixedly connected to an isolation cover (814), and the inner wall of the isolation cover (814) is fixedly connected to a motor three (815).

5. A screw vacuum pump nitrogen sealing device according to claim 4, characterized in that: The output end of the motor three (815) is connected to a rotating disk (816) via a coupling, the isolation cover (814) is movably connected to a side opposite to the rotating disk (816), a side of the rotating disk (816) close to the motor three (815) is fixedly connected to a glue storage tank (817) and a liquid storage bottle (819), a pump one (818) is arranged outside the glue storage tank (817), the outside of the pump one (818) is fixedly connected to the outside of the rotating disk (816), an orifice is opened on the rotating disk (816), and a glue coating joint (822) is fixedly connected in the orifice, the glue coating joint (822) is connected to a side opposite to the glue storage tank (817), and the output end of the pump one (818) is connected to the glue coating joint (822) via a conduit.

6. A screw vacuum pump nitrogen sealing device according to claim 5, characterized in that: The liquid storage bottle (819) is provided with a fine hole on the outside, and a delivery pipe (825) is fixedly connected in the fine hole. 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). A plurality of nozzles (826) distributed at equal intervals 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 fixedly connected to the side opposite to the rotating disk (816). A second pump (820) is fixedly connected to the side of the rotating disk (816) close to the liquid storage bottle (819), and the output end of the second pump (820) is connected to the delivery pipe (825) via a round tube.

7. A screw vacuum pump nitrogen sealing device according to claim 2, characterized in that: The rotating disk (816) is provided with a hole groove, in which a short rod is movably connected, one end of the short rod is movably connected to the inner wall of the isolation frame (824), and the other end is provided with a driving motor (821), the outside of the driving motor (821) is fixedly connected to the outside of the rotating disk (816), the output end of the driving motor (821) is connected to a side of the short rod close to the driving motor (821) via a coupling, and a fixing plate is fixedly connected to a side of the rotating disk (816) away from the driving motor (821), a camera (827) is fixedly connected to the fixing plate, a gas detector (828) is provided on the outside of the camera (827), and the gas detector (828) is fixedly connected to a side opposite to the fixing plate, and two symmetrical quick disassembly modules (9) are provided on the installation cover plate (7).

8. A screw vacuum pump nitrogen sealing device according to claim 7, characterized in that: The quick disassembly module (9) comprises two symmetrical connection frames (901), the connection frames (901) are fixedly connected to the sides opposite to the installation cover plate (7), the inner walls of the connection frames (901) are fixedly connected to the stabilizing seats (902), the inner walls of the stabilizing seats (902) are plugged with latches (905), the latches (905) are fixedly connected to the sides opposite to the closing cover (3), the stabilizing seats (902) are provided with three circumferentially equidistantly distributed grooves, the grooves are slidably connected to locking rods (903), and the sides of the locking rods (903) away from the stabilizing seats (902) are fixedly connected to the short shafts (904).

9. A screw vacuum pump nitrogen sealing device according to claim 8, characterized in that: The outsides of the two latches (905) are slidably connected to a rotating frame (907), and the rotating frame (907) is provided with three circumferentially equidistantly distributed curved grooves (908), and the inner walls of the curved grooves (908) are slidably connected to the outside of the short shaft (904) on the same side. The latches (905) are provided with an annular groove (906), and the inner walls of the annular grooves (906) are clamped to the outside of the three locking rods (903) on the same side.

10. A nitrogen sealing device for a screw vacuum pump according to claim 9, characterized in that: The two rotating frames (907) are movably connected to the side opposite to the stable seat (902) on the same side, the inner wall of the rotating frame (907) is fixedly connected to a coil spring (909), one end of the coil spring (909) away from the rotating frame (907) is fixedly connected to the outside of the stable seat (902) on the same side, and the side of the rotating frame (907) away from the stable seat (902) is fixedly connected to a lever (910), and an arc groove is provided on the connecting frame (901), and the inner wall of the arc groove is slidably connected to the outside of the lever (910) on the same side.

Images